xref: /frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.server.wm;

import static android.view.WindowManager.LayoutParams.*;

import static android.view.WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
import android.app.AppOpsManager;
import android.util.ArraySet;
import android.util.TimeUtils;
import android.view.IWindowId;

import android.view.IWindowSessionCallback;
import android.view.WindowContentFrameStats;
import com.android.internal.app.IBatteryStats;
import com.android.internal.policy.PolicyManager;
import com.android.internal.policy.impl.PhoneWindowManager;
import com.android.internal.util.FastPrintWriter;
import com.android.internal.view.IInputContext;
import com.android.internal.view.IInputMethodClient;
import com.android.internal.view.IInputMethodManager;
import com.android.internal.view.WindowManagerPolicyThread;
import com.android.server.AttributeCache;
import com.android.server.DisplayThread;
import com.android.server.EventLogTags;
import com.android.server.LocalServices;
import com.android.server.UiThread;
import com.android.server.Watchdog;
import com.android.server.am.BatteryStatsService;
import com.android.server.input.InputManagerService;
import com.android.server.power.ShutdownThread;

import android.Manifest;
import android.app.ActivityManagerNative;
import android.app.IActivityManager;
import android.app.StatusBarManager;
import android.app.admin.DevicePolicyManager;
import android.animation.ValueAnimator;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.res.CompatibilityInfo;
import android.content.res.Configuration;
import android.database.ContentObserver;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Region;
import android.hardware.display.DisplayManager;
import android.hardware.display.DisplayManagerInternal;
import android.os.Binder;
import android.os.Bundle;
import android.os.Debug;
import android.os.Handler;
import android.os.IBinder;
import android.os.IRemoteCallback;
import android.os.Looper;
import android.os.Message;
import android.os.Parcel;
import android.os.ParcelFileDescriptor;
import android.os.PowerManager;
import android.os.PowerManagerInternal;
import android.os.Process;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.StrictMode;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.os.Trace;
import android.os.UserHandle;
import android.os.WorkSource;
import android.provider.Settings;
import android.util.DisplayMetrics;
import android.util.EventLog;
import android.util.Log;
import android.util.SparseArray;
import android.util.Pair;
import android.util.Slog;
import android.util.SparseIntArray;
import android.util.TypedValue;
import android.view.Choreographer;
import android.view.Display;
import android.view.DisplayInfo;
import android.view.Gravity;
import android.view.IApplicationToken;
import android.view.IInputFilter;
import android.view.IOnKeyguardExitResult;
import android.view.IRotationWatcher;
import android.view.IWindow;
import android.view.IWindowManager;
import android.view.IWindowSession;
import android.view.InputChannel;
import android.view.InputDevice;
import android.view.InputEvent;
import android.view.InputEventReceiver;
import android.view.KeyEvent;
import android.view.MagnificationSpec;
import android.view.MotionEvent;
import android.view.WindowManagerInternal;
import android.view.Surface.OutOfResourcesException;
import android.view.Surface;
import android.view.SurfaceControl;
import android.view.SurfaceSession;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.WindowManager;
import android.view.WindowManagerGlobal;
import android.view.WindowManagerPolicy;
import android.view.WindowManager.LayoutParams;
import android.view.WindowManagerPolicy.FakeWindow;
import android.view.WindowManagerPolicy.PointerEventListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Transformation;

import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.Socket;
import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;

/** {@hide} */
public class WindowManagerService extends IWindowManager.Stub
        implements Watchdog.Monitor, WindowManagerPolicy.WindowManagerFuncs {
    static final String TAG = "WindowManager";
    static final boolean DEBUG = false;
    static final boolean DEBUG_ADD_REMOVE = false;
    static final boolean DEBUG_FOCUS = false;
    static final boolean DEBUG_FOCUS_LIGHT = DEBUG_FOCUS || false;
    static final boolean DEBUG_ANIM = false;
    static final boolean DEBUG_LAYOUT = false;
    static final boolean DEBUG_RESIZE = false;
    static final boolean DEBUG_LAYERS = false;
    static final boolean DEBUG_INPUT = false;
    static final boolean DEBUG_INPUT_METHOD = false;
    static final boolean DEBUG_VISIBILITY = false;
    static final boolean DEBUG_WINDOW_MOVEMENT = false;
    static final boolean DEBUG_TOKEN_MOVEMENT = false;
    static final boolean DEBUG_ORIENTATION = false;
    static final boolean DEBUG_APP_ORIENTATION = false;
    static final boolean DEBUG_CONFIGURATION = false;
    static final boolean DEBUG_APP_TRANSITIONS = false;
    static final boolean DEBUG_STARTING_WINDOW = false;
    static final boolean DEBUG_REORDER = false;
    static final boolean DEBUG_WALLPAPER = false;
    static final boolean DEBUG_WALLPAPER_LIGHT = false || DEBUG_WALLPAPER;
    static final boolean DEBUG_DRAG = false;
    static final boolean DEBUG_SCREEN_ON = false;
    static final boolean DEBUG_SCREENSHOT = false;
    static final boolean DEBUG_BOOT = false;
    static final boolean DEBUG_LAYOUT_REPEATS = true;
    static final boolean DEBUG_SURFACE_TRACE = false;
    static final boolean DEBUG_WINDOW_TRACE = false;
    static final boolean DEBUG_TASK_MOVEMENT = false;
    static final boolean DEBUG_STACK = false;
    static final boolean DEBUG_DISPLAY = false;
    static final boolean SHOW_SURFACE_ALLOC = false;
    static final boolean SHOW_TRANSACTIONS = false;
    static final boolean SHOW_LIGHT_TRANSACTIONS = false || SHOW_TRANSACTIONS;
    static final boolean HIDE_STACK_CRAWLS = true;
    static final int LAYOUT_REPEAT_THRESHOLD = 4;

    static final boolean PROFILE_ORIENTATION = false;
    static final boolean localLOGV = DEBUG;

    /** How much to multiply the policy's type layer, to reserve room
     * for multiple windows of the same type and Z-ordering adjustment
     * with TYPE_LAYER_OFFSET. */
    static final int TYPE_LAYER_MULTIPLIER = 10000;

    /** Offset from TYPE_LAYER_MULTIPLIER for moving a group of windows above
     * or below others in the same layer. */
    static final int TYPE_LAYER_OFFSET = 1000;

    /** How much to increment the layer for each window, to reserve room
     * for effect surfaces between them.
     */
    static final int WINDOW_LAYER_MULTIPLIER = 5;

    /**
     * Dim surface layer is immediately below target window.
     */
    static final int LAYER_OFFSET_DIM = 1;

    /**
     * Blur surface layer is immediately below dim layer.
     */
    static final int LAYER_OFFSET_BLUR = 2;

    /**
     * FocusedStackFrame layer is immediately above focused window.
     */
    static final int LAYER_OFFSET_FOCUSED_STACK = 1;

    /**
     * Animation thumbnail is as far as possible below the window above
     * the thumbnail (or in other words as far as possible above the window
     * below it).
     */
    static final int LAYER_OFFSET_THUMBNAIL = WINDOW_LAYER_MULTIPLIER-1;

    /**
     * Layer at which to put the rotation freeze snapshot.
     */
    static final int FREEZE_LAYER = (TYPE_LAYER_MULTIPLIER * 200) + 1;

    /**
     * Layer at which to put the mask for emulated screen sizes.
     */
    static final int MASK_LAYER = TYPE_LAYER_MULTIPLIER * 200;

    /** The maximum length we will accept for a loaded animation duration:
     * this is 10 seconds.
     */
    static final int MAX_ANIMATION_DURATION = 10*1000;

    /** Amount of time (in milliseconds) to animate the fade-in-out transition for
     * compatible windows.
     */
    static final int DEFAULT_FADE_IN_OUT_DURATION = 400;

    /** Amount of time (in milliseconds) to delay before declaring a window freeze timeout. */
    static final int WINDOW_FREEZE_TIMEOUT_DURATION = 2000;

    /**
     * If true, the window manager will do its own custom freezing and general
     * management of the screen during rotation.
     */
    static final boolean CUSTOM_SCREEN_ROTATION = true;

    // Maximum number of milliseconds to wait for input devices to be enumerated before
    // proceding with safe mode detection.
    private static final int INPUT_DEVICES_READY_FOR_SAFE_MODE_DETECTION_TIMEOUT_MILLIS = 1000;

    // Default input dispatching timeout in nanoseconds.
    static final long DEFAULT_INPUT_DISPATCHING_TIMEOUT_NANOS = 5000 * 1000000L;

    /** Minimum value for attachStack and resizeStack weight value */
    public static final float STACK_WEIGHT_MIN = 0.2f;

    /** Maximum value for attachStack and resizeStack weight value */
    public static final float STACK_WEIGHT_MAX = 0.8f;

    static final int UPDATE_FOCUS_NORMAL = 0;
    static final int UPDATE_FOCUS_WILL_ASSIGN_LAYERS = 1;
    static final int UPDATE_FOCUS_PLACING_SURFACES = 2;
    static final int UPDATE_FOCUS_WILL_PLACE_SURFACES = 3;

    private static final String SYSTEM_SECURE = "ro.secure";
    private static final String SYSTEM_DEBUGGABLE = "ro.debuggable";

    private static final String DENSITY_OVERRIDE = "ro.config.density_override";
    private static final String SIZE_OVERRIDE = "ro.config.size_override";

    private static final int MAX_SCREENSHOT_RETRIES = 3;

    // The flag describing a full screen app window (where the app takes care of drawing under the
    // SystemUI bars)
    private static final int SYSTEM_UI_FLAGS_LAYOUT_STABLE_FULLSCREEN =
            View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;

    final private KeyguardDisableHandler mKeyguardDisableHandler;

    final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED.equals(action)) {
                mKeyguardDisableHandler.sendEmptyMessage(
                    KeyguardDisableHandler.KEYGUARD_POLICY_CHANGED);
            }
        }
    };

    /**
     * Current user when multi-user is enabled. Don't show windows of
     * non-current user. Also see mCurrentProfileIds.
     */
    int mCurrentUserId;
    /**
     * Users that are profiles of the current user. These are also allowed to show windows
     * on the current user.
     */
    int[] mCurrentProfileIds = new int[] {UserHandle.USER_OWNER};

    final Context mContext;

    final boolean mHaveInputMethods;

    final boolean mAllowBootMessages;

    final boolean mLimitedAlphaCompositing;

    final WindowManagerPolicy mPolicy = PolicyManager.makeNewWindowManager();

    final IActivityManager mActivityManager;

    final IBatteryStats mBatteryStats;

    final AppOpsManager mAppOps;

    final DisplaySettings mDisplaySettings;

    /**
     * All currently active sessions with clients.
     */
    final ArraySet<Session> mSessions = new ArraySet<Session>();

    /**
     * Mapping from an IWindow IBinder to the server's Window object.
     * This is also used as the lock for all of our state.
     * NOTE: Never call into methods that lock ActivityManagerService while holding this object.
     */
    final HashMap<IBinder, WindowState> mWindowMap = new HashMap<IBinder, WindowState>();

    /**
     * Mapping from a token IBinder to a WindowToken object.
     */
    final HashMap<IBinder, WindowToken> mTokenMap = new HashMap<IBinder, WindowToken>();

    /**
     * List of window tokens that have finished starting their application,
     * and now need to have the policy remove their windows.
     */
    final ArrayList<AppWindowToken> mFinishedStarting = new ArrayList<AppWindowToken>();

    /**
     * Fake windows added to the window manager.  Note: ordered from top to
     * bottom, opposite of mWindows.
     */
    final ArrayList<FakeWindowImpl> mFakeWindows = new ArrayList<FakeWindowImpl>();

    /**
     * Windows that are being resized.  Used so we can tell the client about
     * the resize after closing the transaction in which we resized the
     * underlying surface.
     */
    final ArrayList<WindowState> mResizingWindows = new ArrayList<WindowState>();

    /**
     * Windows whose animations have ended and now must be removed.
     */
    final ArrayList<WindowState> mPendingRemove = new ArrayList<WindowState>();

    /**
     * Stacks whose animations have ended and whose tasks, apps, selves may now be removed.
     */
    final ArraySet<TaskStack> mPendingStacksRemove = new ArraySet<TaskStack>();

    /**
     * Used when processing mPendingRemove to avoid working on the original array.
     */
    WindowState[] mPendingRemoveTmp = new WindowState[20];

    /**
     * Windows whose surface should be destroyed.
     */
    final ArrayList<WindowState> mDestroySurface = new ArrayList<WindowState>();

    /**
     * Windows that have lost input focus and are waiting for the new
     * focus window to be displayed before they are told about this.
     */
    ArrayList<WindowState> mLosingFocus = new ArrayList<WindowState>();

    /**
     * This is set when we have run out of memory, and will either be an empty
     * list or contain windows that need to be force removed.
     */
    ArrayList<WindowState> mForceRemoves;

    /**
     * Windows that clients are waiting to have drawn.
     */
    ArrayList<WindowState> mWaitingForDrawn = new ArrayList<WindowState>();
    /**
     * And the callback to make when they've all been drawn.
     */
    Runnable mWaitingForDrawnCallback;

    /**
     * Windows that have called relayout() while we were running animations,
     * so we need to tell when the animation is done.
     */
    final ArrayList<WindowState> mRelayoutWhileAnimating = new ArrayList<WindowState>();

    /**
     * Used when rebuilding window list to keep track of windows that have
     * been removed.
     */
    WindowState[] mRebuildTmp = new WindowState[20];

    /**
     * Stores for each user whether screencapture is disabled
     * This array is essentially a cache for all userId for
     * {@link android.app.admin.DevicePolicyManager#getScreenCaptureDisabled}
     */
    SparseArray<Boolean> mScreenCaptureDisabled = new SparseArray<Boolean>();

    IInputMethodManager mInputMethodManager;

    AccessibilityController mAccessibilityController;

    final SurfaceSession mFxSession;
    Watermark mWatermark;
    StrictModeFlash mStrictModeFlash;
    CircularDisplayMask mCircularDisplayMask;
    FocusedStackFrame mFocusedStackFrame;

    int mFocusedStackLayer;

    final float[] mTmpFloats = new float[9];
    final Rect mTmpContentRect = new Rect();

    boolean mDisplayReady;
    boolean mSafeMode;
    boolean mDisplayEnabled = false;
    boolean mSystemBooted = false;
    boolean mForceDisplayEnabled = false;
    boolean mShowingBootMessages = false;

    String mLastANRState;

    /** All DisplayContents in the world, kept here */
    SparseArray<DisplayContent> mDisplayContents = new SparseArray<DisplayContent>(2);

    int mRotation = 0;
    int mForcedAppOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
    boolean mAltOrientation = false;

    private boolean mKeyguardWaitingForActivityDrawn;

    class RotationWatcher {
        IRotationWatcher watcher;
        IBinder.DeathRecipient deathRecipient;
        RotationWatcher(IRotationWatcher w, IBinder.DeathRecipient d) {
            watcher = w;
            deathRecipient = d;
        }
    }
    ArrayList<RotationWatcher> mRotationWatchers = new ArrayList<RotationWatcher>();
    int mDeferredRotationPauseCount;

    int mSystemDecorLayer = 0;
    final Rect mScreenRect = new Rect();

    boolean mTraversalScheduled = false;
    boolean mDisplayFrozen = false;
    long mDisplayFreezeTime = 0;
    int mLastDisplayFreezeDuration = 0;
    Object mLastFinishedFreezeSource = null;
    boolean mWaitingForConfig = false;
    boolean mWindowsFreezingScreen = false;
    boolean mClientFreezingScreen = false;
    int mAppsFreezingScreen = 0;
    int mLastWindowForcedOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;

    int mLayoutSeq = 0;

    int mLastStatusBarVisibility = 0;

    // State while inside of layoutAndPlaceSurfacesLocked().
    boolean mFocusMayChange;

    Configuration mCurConfiguration = new Configuration();

    // This is held as long as we have the screen frozen, to give us time to
    // perform a rotation animation when turning off shows the lock screen which
    // changes the orientation.
    private final PowerManager.WakeLock mScreenFrozenLock;

    final AppTransition mAppTransition;
    boolean mStartingIconInTransition = false;
    boolean mSkipAppTransitionAnimation = false;

    final ArraySet<AppWindowToken> mOpeningApps = new ArraySet<AppWindowToken>();
    final ArraySet<AppWindowToken> mClosingApps = new ArraySet<AppWindowToken>();

    boolean mIsTouchDevice;

    final DisplayMetrics mDisplayMetrics = new DisplayMetrics();
    final DisplayMetrics mRealDisplayMetrics = new DisplayMetrics();
    final DisplayMetrics mTmpDisplayMetrics = new DisplayMetrics();
    final DisplayMetrics mCompatDisplayMetrics = new DisplayMetrics();

    final H mH = new H();

    final Choreographer mChoreographer = Choreographer.getInstance();

    WindowState mCurrentFocus = null;
    WindowState mLastFocus = null;

    /** This just indicates the window the input method is on top of, not
     * necessarily the window its input is going to. */
    WindowState mInputMethodTarget = null;

    /** If true hold off on modifying the animation layer of mInputMethodTarget */
    boolean mInputMethodTargetWaitingAnim;
    int mInputMethodAnimLayerAdjustment;

    WindowState mInputMethodWindow = null;
    final ArrayList<WindowState> mInputMethodDialogs = new ArrayList<WindowState>();

    boolean mHardKeyboardAvailable;
    boolean mShowImeWithHardKeyboard;
    OnHardKeyboardStatusChangeListener mHardKeyboardStatusChangeListener;
    SettingsObserver mSettingsObserver;

    private final class SettingsObserver extends ContentObserver {
        public SettingsObserver() {
            super(new Handler());
            ContentResolver resolver = mContext.getContentResolver();
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.SHOW_IME_WITH_HARD_KEYBOARD), false, this);
        }

        @Override
        public void onChange(boolean selfChange) {
            updateShowImeWithHardKeyboard();
        }
    }

    final ArrayList<WindowToken> mWallpaperTokens = new ArrayList<WindowToken>();

    // If non-null, this is the currently visible window that is associated
    // with the wallpaper.
    WindowState mWallpaperTarget = null;
    // If non-null, we are in the middle of animating from one wallpaper target
    // to another, and this is the lower one in Z-order.
    WindowState mLowerWallpaperTarget = null;
    // If non-null, we are in the middle of animating from one wallpaper target
    // to another, and this is the higher one in Z-order.
    WindowState mUpperWallpaperTarget = null;
    int mWallpaperAnimLayerAdjustment;
    float mLastWallpaperX = -1;
    float mLastWallpaperY = -1;
    float mLastWallpaperXStep = -1;
    float mLastWallpaperYStep = -1;
    int mLastWallpaperDisplayOffsetX = Integer.MIN_VALUE;
    int mLastWallpaperDisplayOffsetY = Integer.MIN_VALUE;
    // This is set when we are waiting for a wallpaper to tell us it is done
    // changing its scroll position.
    WindowState mWaitingOnWallpaper;
    // The last time we had a timeout when waiting for a wallpaper.
    long mLastWallpaperTimeoutTime;
    // We give a wallpaper up to 150ms to finish scrolling.
    static final long WALLPAPER_TIMEOUT = 150;
    // Time we wait after a timeout before trying to wait again.
    static final long WALLPAPER_TIMEOUT_RECOVERY = 10000;
    boolean mAnimateWallpaperWithTarget;

    AppWindowToken mFocusedApp = null;

    PowerManager mPowerManager;
    PowerManagerInternal mPowerManagerInternal;

    float mWindowAnimationScaleSetting = 1.0f;
    float mTransitionAnimationScaleSetting = 1.0f;
    float mAnimatorDurationScaleSetting = 1.0f;
    boolean mAnimationsDisabled = false;

    final InputManagerService mInputManager;
    final DisplayManagerInternal mDisplayManagerInternal;
    final DisplayManager mDisplayManager;

    // Who is holding the screen on.
    Session mHoldingScreenOn;
    PowerManager.WakeLock mHoldingScreenWakeLock;

    boolean mTurnOnScreen;

    DragState mDragState = null;

    // For frozen screen animations.
    int mExitAnimId, mEnterAnimId;

    /** Pulled out of performLayoutAndPlaceSurfacesLockedInner in order to refactor into multiple
     * methods. */
    class LayoutFields {
        static final int SET_UPDATE_ROTATION                = 1 << 0;
        static final int SET_WALLPAPER_MAY_CHANGE           = 1 << 1;
        static final int SET_FORCE_HIDING_CHANGED           = 1 << 2;
        static final int SET_ORIENTATION_CHANGE_COMPLETE    = 1 << 3;
        static final int SET_TURN_ON_SCREEN                 = 1 << 4;
        static final int SET_WALLPAPER_ACTION_PENDING       = 1 << 5;

        boolean mWallpaperForceHidingChanged = false;
        boolean mWallpaperMayChange = false;
        boolean mOrientationChangeComplete = true;
        Object mLastWindowFreezeSource = null;
        private Session mHoldScreen = null;
        private boolean mObscured = false;
        private boolean mSyswin = false;
        private float mScreenBrightness = -1;
        private float mButtonBrightness = -1;
        private long mUserActivityTimeout = -1;
        private boolean mUpdateRotation = false;
        boolean mWallpaperActionPending = false;

        // Set to true when the display contains content to show the user.
        // When false, the display manager may choose to mirror or blank the display.
        boolean mDisplayHasContent = false;

        // Only set while traversing the default display based on its content.
        // Affects the behavior of mirroring on secondary displays.
        boolean mObscureApplicationContentOnSecondaryDisplays = false;

        float mPreferredRefreshRate = 0;
    }
    final LayoutFields mInnerFields = new LayoutFields();

    boolean mAnimationScheduled;

    /** Skip repeated AppWindowTokens initialization. Note that AppWindowsToken's version of this
     * is a long initialized to Long.MIN_VALUE so that it doesn't match this value on startup. */
    private int mTransactionSequence;

    /** Only do a maximum of 6 repeated layouts. After that quit */
    private int mLayoutRepeatCount;

    final WindowAnimator mAnimator;

    SparseArray<Task> mTaskIdToTask = new SparseArray<Task>();

    /** All of the TaskStacks in the window manager, unordered. For an ordered list call
     * DisplayContent.getStacks(). */
    SparseArray<TaskStack> mStackIdToStack = new SparseArray<TaskStack>();

    private final PointerEventDispatcher mPointerEventDispatcher;

    private WindowContentFrameStats mTempWindowRenderStats;

    final class DragInputEventReceiver extends InputEventReceiver {
        public DragInputEventReceiver(InputChannel inputChannel, Looper looper) {
            super(inputChannel, looper);
        }

        @Override
        public void onInputEvent(InputEvent event) {
            boolean handled = false;
            try {
                if (event instanceof MotionEvent
                        && (event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0
                        && mDragState != null) {
                    final MotionEvent motionEvent = (MotionEvent)event;
                    boolean endDrag = false;
                    final float newX = motionEvent.getRawX();
                    final float newY = motionEvent.getRawY();

                    switch (motionEvent.getAction()) {
                    case MotionEvent.ACTION_DOWN: {
                        if (DEBUG_DRAG) {
                            Slog.w(TAG, "Unexpected ACTION_DOWN in drag layer");
                        }
                    } break;

                    case MotionEvent.ACTION_MOVE: {
                        synchronized (mWindowMap) {
                            // move the surface and tell the involved window(s) where we are
                            mDragState.notifyMoveLw(newX, newY);
                        }
                    } break;

                    case MotionEvent.ACTION_UP: {
                        if (DEBUG_DRAG) Slog.d(TAG, "Got UP on move channel; dropping at "
                                + newX + "," + newY);
                        synchronized (mWindowMap) {
                            endDrag = mDragState.notifyDropLw(newX, newY);
                        }
                    } break;

                    case MotionEvent.ACTION_CANCEL: {
                        if (DEBUG_DRAG) Slog.d(TAG, "Drag cancelled!");
                        endDrag = true;
                    } break;
                    }

                    if (endDrag) {
                        if (DEBUG_DRAG) Slog.d(TAG, "Drag ended; tearing down state");
                        // tell all the windows that the drag has ended
                        synchronized (mWindowMap) {
                            mDragState.endDragLw();
                        }
                    }

                    handled = true;
                }
            } catch (Exception e) {
                Slog.e(TAG, "Exception caught by drag handleMotion", e);
            } finally {
                finishInputEvent(event, handled);
            }
        }
    }

    /**
     * Whether the UI is currently running in touch mode (not showing
     * navigational focus because the user is directly pressing the screen).
     */
    boolean mInTouchMode = true;

    private ViewServer mViewServer;
    private final ArrayList<WindowChangeListener> mWindowChangeListeners =
        new ArrayList<WindowChangeListener>();
    private boolean mWindowsChanged = false;

    public interface WindowChangeListener {
        public void windowsChanged();
        public void focusChanged();
    }

    final Configuration mTempConfiguration = new Configuration();

    // The desired scaling factor for compatible apps.
    float mCompatibleScreenScale;

    // If true, only the core apps and services are being launched because the device
    // is in a special boot mode, such as being encrypted or waiting for a decryption password.
    // For example, when this flag is true, there will be no wallpaper service.
    final boolean mOnlyCore;

    public static WindowManagerService main(final Context context,
            final InputManagerService im,
            final boolean haveInputMethods, final boolean showBootMsgs,
            final boolean onlyCore) {
        final WindowManagerService[] holder = new WindowManagerService[1];
        DisplayThread.getHandler().runWithScissors(new Runnable() {
            @Override
            public void run() {
                holder[0] = new WindowManagerService(context, im,
                        haveInputMethods, showBootMsgs, onlyCore);
            }
        }, 0);
        return holder[0];
    }

    private void initPolicy() {
        UiThread.getHandler().runWithScissors(new Runnable() {
            @Override
            public void run() {
                WindowManagerPolicyThread.set(Thread.currentThread(), Looper.myLooper());

                mPolicy.init(mContext, WindowManagerService.this, WindowManagerService.this);
                mAnimator.mAboveUniverseLayer = mPolicy.getAboveUniverseLayer()
                        * TYPE_LAYER_MULTIPLIER
                        + TYPE_LAYER_OFFSET;
            }
        }, 0);
    }

    private WindowManagerService(Context context, InputManagerService inputManager,
            boolean haveInputMethods, boolean showBootMsgs, boolean onlyCore) {
        mContext = context;
        mHaveInputMethods = haveInputMethods;
        mAllowBootMessages = showBootMsgs;
        mOnlyCore = onlyCore;
        mLimitedAlphaCompositing = context.getResources().getBoolean(
                com.android.internal.R.bool.config_sf_limitedAlpha);
        mInputManager = inputManager; // Must be before createDisplayContentLocked.
        mDisplayManagerInternal = LocalServices.getService(DisplayManagerInternal.class);
        mDisplaySettings = new DisplaySettings(context);
        mDisplaySettings.readSettingsLocked();

        LocalServices.addService(WindowManagerPolicy.class, mPolicy);

        mPointerEventDispatcher = new PointerEventDispatcher(mInputManager.monitorInput(TAG));

        mFxSession = new SurfaceSession();
        mDisplayManager = (DisplayManager)context.getSystemService(Context.DISPLAY_SERVICE);
        Display[] displays = mDisplayManager.getDisplays();
        for (Display display : displays) {
            createDisplayContentLocked(display);
        }

        mKeyguardDisableHandler = new KeyguardDisableHandler(mContext, mPolicy);

        mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
        mPowerManagerInternal = LocalServices.getService(PowerManagerInternal.class);
        mPowerManagerInternal.registerLowPowerModeObserver(
                new PowerManagerInternal.LowPowerModeListener() {
            @Override
            public void onLowPowerModeChanged(boolean enabled) {
                synchronized (mWindowMap) {
                    if (mAnimationsDisabled != enabled) {
                        mAnimationsDisabled = enabled;
                        dispatchNewAnimatorScaleLocked(null);
                    }
                }
            }
        });
        mAnimationsDisabled = mPowerManagerInternal.getLowPowerModeEnabled();
        mScreenFrozenLock = mPowerManager.newWakeLock(
                PowerManager.PARTIAL_WAKE_LOCK, "SCREEN_FROZEN");
        mScreenFrozenLock.setReferenceCounted(false);

        mAppTransition = new AppTransition(context, mH);

        mActivityManager = ActivityManagerNative.getDefault();
        mBatteryStats = BatteryStatsService.getService();
        mAppOps = (AppOpsManager)context.getSystemService(Context.APP_OPS_SERVICE);
        AppOpsManager.OnOpChangedInternalListener opListener =
                new AppOpsManager.OnOpChangedInternalListener() {
                    @Override public void onOpChanged(int op, String packageName) {
                        updateAppOpsState();
                    }
                };
        mAppOps.startWatchingMode(AppOpsManager.OP_SYSTEM_ALERT_WINDOW, null, opListener);
        mAppOps.startWatchingMode(AppOpsManager.OP_TOAST_WINDOW, null, opListener);

        // Get persisted window scale setting
        mWindowAnimationScaleSetting = Settings.Global.getFloat(context.getContentResolver(),
                Settings.Global.WINDOW_ANIMATION_SCALE, mWindowAnimationScaleSetting);
        mTransitionAnimationScaleSetting = Settings.Global.getFloat(context.getContentResolver(),
                Settings.Global.TRANSITION_ANIMATION_SCALE, mTransitionAnimationScaleSetting);
        setAnimatorDurationScale(Settings.Global.getFloat(context.getContentResolver(),
                Settings.Global.ANIMATOR_DURATION_SCALE, mAnimatorDurationScaleSetting));

        // Track changes to DevicePolicyManager state so we can enable/disable keyguard.
        IntentFilter filter = new IntentFilter();
        filter.addAction(DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED);
        mContext.registerReceiver(mBroadcastReceiver, filter);

        mSettingsObserver = new SettingsObserver();
        updateShowImeWithHardKeyboard();

        mHoldingScreenWakeLock = mPowerManager.newWakeLock(
                PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE, TAG);
        mHoldingScreenWakeLock.setReferenceCounted(false);

        mAnimator = new WindowAnimator(this);

        LocalServices.addService(WindowManagerInternal.class, new LocalService());
        initPolicy();

        // Add ourself to the Watchdog monitors.
        Watchdog.getInstance().addMonitor(this);

        SurfaceControl.openTransaction();
        try {
            createWatermarkInTransaction();
            mFocusedStackFrame = new FocusedStackFrame(
                    getDefaultDisplayContentLocked().getDisplay(), mFxSession);
        } finally {
            SurfaceControl.closeTransaction();
        }

        showCircularDisplayMaskIfNeeded();
    }

    public InputMonitor getInputMonitor() {
        return mInputMonitor;
    }

    @Override
    public boolean onTransact(int code, Parcel data, Parcel reply, int flags)
            throws RemoteException {
        try {
            return super.onTransact(code, data, reply, flags);
        } catch (RuntimeException e) {
            // The window manager only throws security exceptions, so let's
            // log all others.
            if (!(e instanceof SecurityException)) {
                Slog.wtf(TAG, "Window Manager Crash", e);
            }
            throw e;
        }
    }

    private void placeWindowAfter(WindowState pos, WindowState window) {
        final WindowList windows = pos.getWindowList();
        final int i = windows.indexOf(pos);
        if (DEBUG_FOCUS || DEBUG_WINDOW_MOVEMENT || DEBUG_ADD_REMOVE) Slog.v(
            TAG, "Adding window " + window + " at "
            + (i+1) + " of " + windows.size() + " (after " + pos + ")");
        windows.add(i+1, window);
        mWindowsChanged = true;
    }

    private void placeWindowBefore(WindowState pos, WindowState window) {
        final WindowList windows = pos.getWindowList();
        int i = windows.indexOf(pos);
        if (DEBUG_FOCUS || DEBUG_WINDOW_MOVEMENT || DEBUG_ADD_REMOVE) Slog.v(
            TAG, "Adding window " + window + " at "
            + i + " of " + windows.size() + " (before " + pos + ")");
        if (i < 0) {
            Slog.w(TAG, "placeWindowBefore: Unable to find " + pos + " in " + windows);
            i = 0;
        }
        windows.add(i, window);
        mWindowsChanged = true;
    }

    //This method finds out the index of a window that has the same app token as
    //win. used for z ordering the windows in mWindows
    private int findIdxBasedOnAppTokens(WindowState win) {
        WindowList windows = win.getWindowList();
        for(int j = windows.size() - 1; j >= 0; j--) {
            WindowState wentry = windows.get(j);
            if(wentry.mAppToken == win.mAppToken) {
                return j;
            }
        }
        return -1;
    }

    /**
     * Return the list of Windows from the passed token on the given Display.
     * @param token The token with all the windows.
     * @param displayContent The display we are interested in.
     * @return List of windows from token that are on displayContent.
     */
    WindowList getTokenWindowsOnDisplay(WindowToken token, DisplayContent displayContent) {
        final WindowList windowList = new WindowList();
        final int count = token.windows.size();
        for (int i = 0; i < count; i++) {
            final WindowState win = token.windows.get(i);
            if (win.getDisplayContent() == displayContent) {
                windowList.add(win);
            }
        }
        return windowList;
    }

    /**
     * Recursive search through a WindowList and all of its windows' children.
     * @param targetWin The window to search for.
     * @param windows The list to search.
     * @return The index of win in windows or of the window that is an ancestor of win.
     */
    private int indexOfWinInWindowList(WindowState targetWin, WindowList windows) {
        for (int i = windows.size() - 1; i >= 0; i--) {
            final WindowState w = windows.get(i);
            if (w == targetWin) {
                return i;
            }
            if (!w.mChildWindows.isEmpty()) {
                if (indexOfWinInWindowList(targetWin, w.mChildWindows) >= 0) {
                    return i;
                }
            }
        }
        return -1;
    }

    private int addAppWindowToListLocked(final WindowState win) {
        final IWindow client = win.mClient;
        final WindowToken token = win.mToken;
        final DisplayContent displayContent = win.getDisplayContent();
        if (displayContent == null) {
            // It doesn't matter this display is going away.
            return 0;
        }

        final WindowList windows = win.getWindowList();
        final int N = windows.size();
        WindowList tokenWindowList = getTokenWindowsOnDisplay(token, displayContent);
        int tokenWindowsPos = 0;
        int windowListPos = tokenWindowList.size();
        if (!tokenWindowList.isEmpty()) {
            // If this application has existing windows, we
            // simply place the new window on top of them... but
            // keep the starting window on top.
            if (win.mAttrs.type == TYPE_BASE_APPLICATION) {
                // Base windows go behind everything else.
                WindowState lowestWindow = tokenWindowList.get(0);
                placeWindowBefore(lowestWindow, win);
                tokenWindowsPos = indexOfWinInWindowList(lowestWindow, token.windows);
            } else {
                AppWindowToken atoken = win.mAppToken;
                WindowState lastWindow = tokenWindowList.get(windowListPos - 1);
                if (atoken != null && lastWindow == atoken.startingWindow) {
                    placeWindowBefore(lastWindow, win);
                    tokenWindowsPos = indexOfWinInWindowList(lastWindow, token.windows);
                } else {
                    int newIdx = findIdxBasedOnAppTokens(win);
                    //there is a window above this one associated with the same
                    //apptoken note that the window could be a floating window
                    //that was created later or a window at the top of the list of
                    //windows associated with this token.
                    if (DEBUG_FOCUS_LIGHT || DEBUG_WINDOW_MOVEMENT || DEBUG_ADD_REMOVE) Slog.v(TAG,
                            "not Base app: Adding window " + win + " at " + (newIdx + 1) + " of " +
                            N);
                    windows.add(newIdx + 1, win);
                    if (newIdx < 0) {
                        // No window from token found on win's display.
                        tokenWindowsPos = 0;
                    } else {
                        tokenWindowsPos = indexOfWinInWindowList(
                                windows.get(newIdx), token.windows) + 1;
                    }
                    mWindowsChanged = true;
                }
            }
            return tokenWindowsPos;
        }

        // No windows from this token on this display
        if (localLOGV) Slog.v(TAG, "Figuring out where to add app window " + client.asBinder()
                + " (token=" + token + ")");
        // Figure out where the window should go, based on the
        // order of applications.
        WindowState pos = null;

        final ArrayList<Task> tasks = displayContent.getTasks();
        int taskNdx;
        int tokenNdx = -1;
        for (taskNdx = tasks.size() - 1; taskNdx >= 0; --taskNdx) {
            AppTokenList tokens = tasks.get(taskNdx).mAppTokens;
            for (tokenNdx = tokens.size() - 1; tokenNdx >= 0; --tokenNdx) {
                final AppWindowToken t = tokens.get(tokenNdx);
                if (t == token) {
                    --tokenNdx;
                    if (tokenNdx < 0) {
                        --taskNdx;
                        if (taskNdx >= 0) {
                            tokenNdx = tasks.get(taskNdx).mAppTokens.size() - 1;
                        }
                    }
                    break;
                }

                // We haven't reached the token yet; if this token
                // is not going to the bottom and has windows on this display, we can
                // use it as an anchor for when we do reach the token.
                tokenWindowList = getTokenWindowsOnDisplay(t, displayContent);
                if (!t.sendingToBottom && tokenWindowList.size() > 0) {
                    pos = tokenWindowList.get(0);
                }
            }
            if (tokenNdx >= 0) {
                // early exit
                break;
            }
        }

        // We now know the index into the apps.  If we found
        // an app window above, that gives us the position; else
        // we need to look some more.
        if (pos != null) {
            // Move behind any windows attached to this one.
            WindowToken atoken = mTokenMap.get(pos.mClient.asBinder());
            if (atoken != null) {
                tokenWindowList =
                        getTokenWindowsOnDisplay(atoken, displayContent);
                final int NC = tokenWindowList.size();
                if (NC > 0) {
                    WindowState bottom = tokenWindowList.get(0);
                    if (bottom.mSubLayer < 0) {
                        pos = bottom;
                    }
                }
            }
            placeWindowBefore(pos, win);
            return tokenWindowsPos;
        }

        // Continue looking down until we find the first
        // token that has windows on this display.
        for ( ; taskNdx >= 0; --taskNdx) {
            AppTokenList tokens = tasks.get(taskNdx).mAppTokens;
            for ( ; tokenNdx >= 0; --tokenNdx) {
                final AppWindowToken t = tokens.get(tokenNdx);
                tokenWindowList = getTokenWindowsOnDisplay(t, displayContent);
                final int NW = tokenWindowList.size();
                if (NW > 0) {
                    pos = tokenWindowList.get(NW-1);
                    break;
                }
            }
            if (tokenNdx >= 0) {
                // found
                break;
            }
        }

        if (pos != null) {
            // Move in front of any windows attached to this
            // one.
            WindowToken atoken = mTokenMap.get(pos.mClient.asBinder());
            if (atoken != null) {
                final int NC = atoken.windows.size();
                if (NC > 0) {
                    WindowState top = atoken.windows.get(NC-1);
                    if (top.mSubLayer >= 0) {
                        pos = top;
                    }
                }
            }
            placeWindowAfter(pos, win);
            return tokenWindowsPos;
        }

        // Just search for the start of this layer.
        final int myLayer = win.mBaseLayer;
        int i;
        for (i = 0; i < N; i++) {
            WindowState w = windows.get(i);
            if (w.mBaseLayer > myLayer) {
                break;
            }
        }
        if (DEBUG_FOCUS_LIGHT || DEBUG_WINDOW_MOVEMENT || DEBUG_ADD_REMOVE) Slog.v(TAG,
                "Based on layer: Adding window " + win + " at " + i + " of " + N);
        windows.add(i, win);
        mWindowsChanged = true;
        return tokenWindowsPos;
    }

    private void addFreeWindowToListLocked(final WindowState win) {
        final WindowList windows = win.getWindowList();

        // Figure out where window should go, based on layer.
        final int myLayer = win.mBaseLayer;
        int i;
        for (i = windows.size() - 1; i >= 0; i--) {
            if (windows.get(i).mBaseLayer <= myLayer) {
                break;
            }
        }
        i++;
        if (DEBUG_FOCUS_LIGHT || DEBUG_WINDOW_MOVEMENT || DEBUG_ADD_REMOVE) Slog.v(TAG,
                "Free window: Adding window " + win + " at " + i + " of " + windows.size());
        windows.add(i, win);
        mWindowsChanged = true;
    }

    private void addAttachedWindowToListLocked(final WindowState win, boolean addToToken) {
        final WindowToken token = win.mToken;
        final DisplayContent displayContent = win.getDisplayContent();
        if (displayContent == null) {
            return;
        }
        final WindowState attached = win.mAttachedWindow;

        WindowList tokenWindowList = getTokenWindowsOnDisplay(token, displayContent);

        // Figure out this window's ordering relative to the window
        // it is attached to.
        final int NA = tokenWindowList.size();
        final int sublayer = win.mSubLayer;
        int largestSublayer = Integer.MIN_VALUE;
        WindowState windowWithLargestSublayer = null;
        int i;
        for (i = 0; i < NA; i++) {
            WindowState w = tokenWindowList.get(i);
            final int wSublayer = w.mSubLayer;
            if (wSublayer >= largestSublayer) {
                largestSublayer = wSublayer;
                windowWithLargestSublayer = w;
            }
            if (sublayer < 0) {
                // For negative sublayers, we go below all windows
                // in the same sublayer.
                if (wSublayer >= sublayer) {
                    if (addToToken) {
                        if (DEBUG_ADD_REMOVE) Slog.v(TAG, "Adding " + win + " to " + token);
                        token.windows.add(i, win);
                    }
                    placeWindowBefore(wSublayer >= 0 ? attached : w, win);
                    break;
                }
            } else {
                // For positive sublayers, we go above all windows
                // in the same sublayer.
                if (wSublayer > sublayer) {
                    if (addToToken) {
                        if (DEBUG_ADD_REMOVE) Slog.v(TAG, "Adding " + win + " to " + token);
                        token.windows.add(i, win);
                    }
                    placeWindowBefore(w, win);
                    break;
                }
            }
        }
        if (i >= NA) {
            if (addToToken) {
                if (DEBUG_ADD_REMOVE) Slog.v(TAG, "Adding " + win + " to " + token);
                token.windows.add(win);
            }
            if (sublayer < 0) {
                placeWindowBefore(attached, win);
            } else {
                placeWindowAfter(largestSublayer >= 0
                                 ? windowWithLargestSublayer
                                 : attached,
                                 win);
            }
        }
    }

    private void addWindowToListInOrderLocked(final WindowState win, boolean addToToken) {
        if (DEBUG_FOCUS_LIGHT) Slog.d(TAG, "addWindowToListInOrderLocked: win=" + win +
                " Callers=" + Debug.getCallers(4));
        if (win.mAttachedWindow == null) {
            final WindowToken token = win.mToken;
            int tokenWindowsPos = 0;
            if (token.appWindowToken != null) {
                tokenWindowsPos = addAppWindowToListLocked(win);
            } else {
                addFreeWindowToListLocked(win);
            }
            if (addToToken) {
                if (DEBUG_ADD_REMOVE) Slog.v(TAG, "Adding " + win + " to " + token);
                token.windows.add(tokenWindowsPos, win);
            }
        } else {
            addAttachedWindowToListLocked(win, addToToken);
        }

        if (win.mAppToken != null && addToToken) {
            win.mAppToken.allAppWindows.add(win);
        }
    }

    static boolean canBeImeTarget(WindowState w) {
        final int fl = w.mAttrs.flags
                & (FLAG_NOT_FOCUSABLE|FLAG_ALT_FOCUSABLE_IM);
        if (fl == 0 || fl == (FLAG_NOT_FOCUSABLE|FLAG_ALT_FOCUSABLE_IM)
                || w.mAttrs.type == TYPE_APPLICATION_STARTING) {
            if (DEBUG_INPUT_METHOD) {
                Slog.i(TAG, "isVisibleOrAdding " + w + ": " + w.isVisibleOrAdding());
                if (!w.isVisibleOrAdding()) {
                    Slog.i(TAG, "  mSurface=" + w.mWinAnimator.mSurfaceControl
                            + " relayoutCalled=" + w.mRelayoutCalled + " viewVis=" + w.mViewVisibility
                            + " policyVis=" + w.mPolicyVisibility
                            + " policyVisAfterAnim=" + w.mPolicyVisibilityAfterAnim
                            + " attachHid=" + w.mAttachedHidden
                            + " exiting=" + w.mExiting + " destroying=" + w.mDestroying);
                    if (w.mAppToken != null) {
                        Slog.i(TAG, "  mAppToken.hiddenRequested=" + w.mAppToken.hiddenRequested);
                    }
                }
            }
            return w.isVisibleOrAdding();
        }
        return false;
    }

    /**
     * Dig through the WindowStates and find the one that the Input Method will target.
     * @param willMove
     * @return The index+1 in mWindows of the discovered target.
     */
    int findDesiredInputMethodWindowIndexLocked(boolean willMove) {
        // TODO(multidisplay): Needs some serious rethought when the target and IME are not on the
        // same display. Or even when the current IME/target are not on the same screen as the next
        // IME/target. For now only look for input windows on the main screen.
        WindowList windows = getDefaultWindowListLocked();
        WindowState w = null;
        int i;
        for (i = windows.size() - 1; i >= 0; --i) {
            WindowState win = windows.get(i);

            if (DEBUG_INPUT_METHOD && willMove) Slog.i(TAG, "Checking window @" + i
                    + " " + win + " fl=0x" + Integer.toHexString(win.mAttrs.flags));
            if (canBeImeTarget(win)) {
                w = win;
                //Slog.i(TAG, "Putting input method here!");

                // Yet more tricksyness!  If this window is a "starting"
                // window, we do actually want to be on top of it, but
                // it is not -really- where input will go.  So if the caller
                // is not actually looking to move the IME, look down below
                // for a real window to target...
                if (!willMove
                        && w.mAttrs.type == TYPE_APPLICATION_STARTING
                        && i > 0) {
                    WindowState wb = windows.get(i-1);
                    if (wb.mAppToken == w.mAppToken && canBeImeTarget(wb)) {
                        i--;
                        w = wb;
                    }
                }
                break;
            }
        }

        // Now w is either mWindows[0] or an IME (or null if mWindows is empty).

        if (DEBUG_INPUT_METHOD && willMove) Slog.v(TAG, "Proposed new IME target: " + w);

        // Now, a special case -- if the last target's window is in the
        // process of exiting, and is above the new target, keep on the
        // last target to avoid flicker.  Consider for example a Dialog with
        // the IME shown: when the Dialog is dismissed, we want to keep
        // the IME above it until it is completely gone so it doesn't drop
        // behind the dialog or its full-screen scrim.
        final WindowState curTarget = mInputMethodTarget;
        if (curTarget != null
                && curTarget.isDisplayedLw()
                && curTarget.isClosing()
                && (w == null || curTarget.mWinAnimator.mAnimLayer > w.mWinAnimator.mAnimLayer)) {
            if (DEBUG_INPUT_METHOD) Slog.v(TAG, "Current target higher, not changing");
            return windows.indexOf(curTarget) + 1;
        }

        if (DEBUG_INPUT_METHOD) Slog.v(TAG, "Desired input method target="
                + w + " willMove=" + willMove);

        if (willMove && w != null) {
            AppWindowToken token = curTarget == null ? null : curTarget.mAppToken;
            if (token != null) {

                // Now some fun for dealing with window animations that
                // modify the Z order.  We need to look at all windows below
                // the current target that are in this app, finding the highest
                // visible one in layering.
                WindowState highestTarget = null;
                int highestPos = 0;
                if (token.mAppAnimator.animating || token.mAppAnimator.animation != null) {
                    WindowList curWindows = curTarget.getWindowList();
                    int pos = curWindows.indexOf(curTarget);
                    while (pos >= 0) {
                        WindowState win = curWindows.get(pos);
                        if (win.mAppToken != token) {
                            break;
                        }
                        if (!win.mRemoved) {
                            if (highestTarget == null || win.mWinAnimator.mAnimLayer >
                                    highestTarget.mWinAnimator.mAnimLayer) {
                                highestTarget = win;
                                highestPos = pos;
                            }
                        }
                        pos--;
                    }
                }

                if (highestTarget != null) {
                    if (DEBUG_INPUT_METHOD) Slog.v(TAG, mAppTransition + " " + highestTarget
                            + " animating=" + highestTarget.mWinAnimator.isAnimating()
                            + " layer=" + highestTarget.mWinAnimator.mAnimLayer
                            + " new layer=" + w.mWinAnimator.mAnimLayer);

                    if (mAppTransition.isTransitionSet()) {
                        // If we are currently setting up for an animation,
                        // hold everything until we can find out what will happen.
                        mInputMethodTargetWaitingAnim = true;
                        mInputMethodTarget = highestTarget;
                        return highestPos + 1;
                    } else if (highestTarget.mWinAnimator.isAnimating() &&
                            highestTarget.mWinAnimator.mAnimLayer > w.mWinAnimator.mAnimLayer) {
                        // If the window we are currently targeting is involved
                        // with an animation, and it is on top of the next target
                        // we will be over, then hold off on moving until
                        // that is done.
                        mInputMethodTargetWaitingAnim = true;
                        mInputMethodTarget = highestTarget;
                        return highestPos + 1;
                    }
                }
            }
        }

        //Slog.i(TAG, "Placing input method @" + (i+1));
        if (w != null) {
            if (willMove) {
                if (DEBUG_INPUT_METHOD) Slog.w(TAG, "Moving IM target from " + curTarget + " to "
                        + w + (HIDE_STACK_CRAWLS ? "" : " Callers=" + Debug.getCallers(4)));
                mInputMethodTarget = w;
                mInputMethodTargetWaitingAnim = false;
                if (w.mAppToken != null) {
                    setInputMethodAnimLayerAdjustment(w.mAppToken.mAppAnimator.animLayerAdjustment);
                } else {
                    setInputMethodAnimLayerAdjustment(0);
                }
            }
            return i+1;
        }
        if (willMove) {
            if (DEBUG_INPUT_METHOD) Slog.w(TAG, "Moving IM target from " + curTarget + " to null."
                    + (HIDE_STACK_CRAWLS ? "" : " Callers=" + Debug.getCallers(4)));
            mInputMethodTarget = null;
            setInputMethodAnimLayerAdjustment(0);
        }
        return -1;
    }

    void addInputMethodWindowToListLocked(WindowState win) {
        int pos = findDesiredInputMethodWindowIndexLocked(true);
        if (pos >= 0) {
            win.mTargetAppToken = mInputMethodTarget.mAppToken;
            if (DEBUG_WINDOW_MOVEMENT || DEBUG_ADD_REMOVE) Slog.v(
                    TAG, "Adding input method window " + win + " at " + pos);
            // TODO(multidisplay): IMEs are only supported on the default display.
            getDefaultWindowListLocked().add(pos, win);
            mWindowsChanged = true;
            moveInputMethodDialogsLocked(pos+1);
            return;
        }
        win.mTargetAppToken = null;
        addWindowToListInOrderLocked(win, true);
        moveInputMethodDialogsLocked(pos);
    }

    void setInputMethodAnimLayerAdjustment(int adj) {
        if (DEBUG_LAYERS) Slog.v(TAG, "Setting im layer adj to " + adj);
        mInputMethodAnimLayerAdjustment = adj;
        WindowState imw = mInputMethodWindow;
        if (imw != null) {
            imw.mWinAnimator.mAnimLayer = imw.mLayer + adj;
            if (DEBUG_LAYERS) Slog.v(TAG, "IM win " + imw
                    + " anim layer: " + imw.mWinAnimator.mAnimLayer);
            int wi = imw.mChildWindows.size();
            while (wi > 0) {
                wi--;
                WindowState cw = imw.mChildWindows.get(wi);
                cw.mWinAnimator.mAnimLayer = cw.mLayer + adj;
                if (DEBUG_LAYERS) Slog.v(TAG, "IM win " + cw
                        + " anim layer: " + cw.mWinAnimator.mAnimLayer);
            }
        }
        int di = mInputMethodDialogs.size();
        while (di > 0) {
            di --;
            imw = mInputMethodDialogs.get(di);
            imw.mWinAnimator.mAnimLayer = imw.mLayer + adj;
            if (DEBUG_LAYERS) Slog.v(TAG, "IM win " + imw
                    + " anim layer: " + imw.mWinAnimator.mAnimLayer);
        }
    }

    private int tmpRemoveWindowLocked(int interestingPos, WindowState win) {
        WindowList windows = win.getWindowList();
        int wpos = windows.indexOf(win);
        if (wpos >= 0) {
            if (wpos < interestingPos) interestingPos--;
            if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "Temp removing at " + wpos + ": " + win);
            windows.remove(wpos);
            mWindowsChanged = true;
            int NC = win.mChildWindows.size();
            while (NC > 0) {
                NC--;
                WindowState cw = win.mChildWindows.get(NC);
                int cpos = windows.indexOf(cw);
                if (cpos >= 0) {
                    if (cpos < interestingPos) interestingPos--;
                    if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "Temp removing child at "
                            + cpos + ": " + cw);
                    windows.remove(cpos);
                }
            }
        }
        return interestingPos;
    }

    private void reAddWindowToListInOrderLocked(WindowState win) {
        addWindowToListInOrderLocked(win, false);
        // This is a hack to get all of the child windows added as well
        // at the right position.  Child windows should be rare and
        // this case should be rare, so it shouldn't be that big a deal.
        WindowList windows = win.getWindowList();
        int wpos = windows.indexOf(win);
        if (wpos >= 0) {
            if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "ReAdd removing from " + wpos + ": " + win);
            windows.remove(wpos);
            mWindowsChanged = true;
            reAddWindowLocked(wpos, win);
        }
    }

    void logWindowList(final WindowList windows, String prefix) {
        int N = windows.size();
        while (N > 0) {
            N--;
            Slog.v(TAG, prefix + "#" + N + ": " + windows.get(N));
        }
    }

    void moveInputMethodDialogsLocked(int pos) {
        ArrayList<WindowState> dialogs = mInputMethodDialogs;

        // TODO(multidisplay): IMEs are only supported on the default display.
        WindowList windows = getDefaultWindowListLocked();
        final int N = dialogs.size();
        if (DEBUG_INPUT_METHOD) Slog.v(TAG, "Removing " + N + " dialogs w/pos=" + pos);
        for (int i=0; i<N; i++) {
            pos = tmpRemoveWindowLocked(pos, dialogs.get(i));
        }
        if (DEBUG_INPUT_METHOD) {
            Slog.v(TAG, "Window list w/pos=" + pos);
            logWindowList(windows, "  ");
        }

        if (pos >= 0) {
            final AppWindowToken targetAppToken = mInputMethodTarget.mAppToken;
            // Skip windows owned by the input method.
            if (mInputMethodWindow != null) {
                while (pos < windows.size()) {
                    WindowState wp = windows.get(pos);
                    if (wp == mInputMethodWindow || wp.mAttachedWindow == mInputMethodWindow) {
                        pos++;
                        continue;
                    }
                    break;
                }
            }
            if (DEBUG_INPUT_METHOD) Slog.v(TAG, "Adding " + N + " dialogs at pos=" + pos);
            for (int i=0; i<N; i++) {
                WindowState win = dialogs.get(i);
                win.mTargetAppToken = targetAppToken;
                pos = reAddWindowLocked(pos, win);
            }
            if (DEBUG_INPUT_METHOD) {
                Slog.v(TAG, "Final window list:");
                logWindowList(windows, "  ");
            }
            return;
        }
        for (int i=0; i<N; i++) {
            WindowState win = dialogs.get(i);
            win.mTargetAppToken = null;
            reAddWindowToListInOrderLocked(win);
            if (DEBUG_INPUT_METHOD) {
                Slog.v(TAG, "No IM target, final list:");
                logWindowList(windows, "  ");
            }
        }
    }

    boolean moveInputMethodWindowsIfNeededLocked(boolean needAssignLayers) {
        final WindowState imWin = mInputMethodWindow;
        final int DN = mInputMethodDialogs.size();
        if (imWin == null && DN == 0) {
            return false;
        }

        // TODO(multidisplay): IMEs are only supported on the default display.
        WindowList windows = getDefaultWindowListLocked();

        int imPos = findDesiredInputMethodWindowIndexLocked(true);
        if (imPos >= 0) {
            // In this case, the input method windows are to be placed
            // immediately above the window they are targeting.

            // First check to see if the input method windows are already
            // located here, and contiguous.
            final int N = windows.size();
            WindowState firstImWin = imPos < N
                    ? windows.get(imPos) : null;

            // Figure out the actual input method window that should be
            // at the bottom of their stack.
            WindowState baseImWin = imWin != null
                    ? imWin : mInputMethodDialogs.get(0);
            if (baseImWin.mChildWindows.size() > 0) {
                WindowState cw = baseImWin.mChildWindows.get(0);
                if (cw.mSubLayer < 0) baseImWin = cw;
            }

            if (firstImWin == baseImWin) {
                // The windows haven't moved...  but are they still contiguous?
                // First find the top IM window.
                int pos = imPos+1;
                while (pos < N) {
                    if (!(windows.get(pos)).mIsImWindow) {
                        break;
                    }
                    pos++;
                }
                pos++;
                // Now there should be no more input method windows above.
                while (pos < N) {
                    if ((windows.get(pos)).mIsImWindow) {
                        break;
                    }
                    pos++;
                }
                if (pos >= N) {
                    // Z order is good.
                    // The IM target window may be changed, so update the mTargetAppToken.
                    if (imWin != null) {
                        imWin.mTargetAppToken = mInputMethodTarget.mAppToken;
                    }
                    return false;
                }
            }

            if (imWin != null) {
                if (DEBUG_INPUT_METHOD) {
                    Slog.v(TAG, "Moving IM from " + imPos);
                    logWindowList(windows, "  ");
                }
                imPos = tmpRemoveWindowLocked(imPos, imWin);
                if (DEBUG_INPUT_METHOD) {
                    Slog.v(TAG, "List after removing with new pos " + imPos + ":");
                    logWindowList(windows, "  ");
                }
                imWin.mTargetAppToken = mInputMethodTarget.mAppToken;
                reAddWindowLocked(imPos, imWin);
                if (DEBUG_INPUT_METHOD) {
                    Slog.v(TAG, "List after moving IM to " + imPos + ":");
                    logWindowList(windows, "  ");
                }
                if (DN > 0) moveInputMethodDialogsLocked(imPos+1);
            } else {
                moveInputMethodDialogsLocked(imPos);
            }

        } else {
            // In this case, the input method windows go in a fixed layer,
            // because they aren't currently associated with a focus window.

            if (imWin != null) {
                if (DEBUG_INPUT_METHOD) Slog.v(TAG, "Moving IM from " + imPos);
                tmpRemoveWindowLocked(0, imWin);
                imWin.mTargetAppToken = null;
                reAddWindowToListInOrderLocked(imWin);
                if (DEBUG_INPUT_METHOD) {
                    Slog.v(TAG, "List with no IM target:");
                    logWindowList(windows, "  ");
                }
                if (DN > 0) moveInputMethodDialogsLocked(-1);
            } else {
                moveInputMethodDialogsLocked(-1);
            }

        }

        if (needAssignLayers) {
            assignLayersLocked(windows);
        }

        return true;
    }

    final boolean isWallpaperVisible(WindowState wallpaperTarget) {
        if (DEBUG_WALLPAPER) Slog.v(TAG, "Wallpaper vis: target " + wallpaperTarget + ", obscured="
                + (wallpaperTarget != null ? Boolean.toString(wallpaperTarget.mObscured) : "??")
                + " anim=" + ((wallpaperTarget != null && wallpaperTarget.mAppToken != null)
                        ? wallpaperTarget.mAppToken.mAppAnimator.animation : null)
                + " upper=" + mUpperWallpaperTarget
                + " lower=" + mLowerWallpaperTarget);
        return (wallpaperTarget != null
                        && (!wallpaperTarget.mObscured || (wallpaperTarget.mAppToken != null
                                && wallpaperTarget.mAppToken.mAppAnimator.animation != null)))
                || mUpperWallpaperTarget != null
                || mLowerWallpaperTarget != null;
    }

    static final int ADJUST_WALLPAPER_LAYERS_CHANGED = 1<<1;
    static final int ADJUST_WALLPAPER_VISIBILITY_CHANGED = 1<<2;

    int adjustWallpaperWindowsLocked() {
        mInnerFields.mWallpaperMayChange = false;
        boolean targetChanged = false;

        // TODO(multidisplay): Wallpapers on main screen only.
        final DisplayInfo displayInfo = getDefaultDisplayContentLocked().getDisplayInfo();
        final int dw = displayInfo.logicalWidth;
        final int dh = displayInfo.logicalHeight;

        // First find top-most window that has asked to be on top of the
        // wallpaper; all wallpapers go behind it.
        final WindowList windows = getDefaultWindowListLocked();
        int N = windows.size();
        WindowState w = null;
        WindowState foundW = null;
        int foundI = 0;
        WindowState topCurW = null;
        int topCurI = 0;
        int windowDetachedI = -1;
        int i = N;
        while (i > 0) {
            i--;
            w = windows.get(i);
            if ((w.mAttrs.type == TYPE_WALLPAPER)) {
                if (topCurW == null) {
                    topCurW = w;
                    topCurI = i;
                }
                continue;
            }
            topCurW = null;
            if (w != mAnimator.mWindowDetachedWallpaper && w.mAppToken != null) {
                // If this window's app token is hidden and not animating,
                // it is of no interest to us.
                if (w.mAppToken.hidden && w.mAppToken.mAppAnimator.animation == null) {
                    if (DEBUG_WALLPAPER) Slog.v(TAG,
                            "Skipping hidden and not animating token: " + w);
                    continue;
                }
            }
            if (DEBUG_WALLPAPER) Slog.v(TAG, "Win #" + i + " " + w + ": isOnScreen="
                    + w.isOnScreen() + " mDrawState=" + w.mWinAnimator.mDrawState);

            // If the app is executing an animation because the keyguard is going away, keep the
            // wallpaper during the animation so it doesn't flicker out.
            final boolean hasWallpaper = (w.mAttrs.flags&FLAG_SHOW_WALLPAPER) != 0
                    || (w.mAppToken != null
                            && w.mWinAnimator.keyguardGoingAwayAnimation);
            if (hasWallpaper && w.isOnScreen()
                    && (mWallpaperTarget == w || w.isDrawFinishedLw())) {
                if (DEBUG_WALLPAPER) Slog.v(TAG,
                        "Found wallpaper target: #" + i + "=" + w);
                foundW = w;
                foundI = i;
                if (w == mWallpaperTarget && w.mWinAnimator.isAnimating()) {
                    // The current wallpaper target is animating, so we'll
                    // look behind it for another possible target and figure
                    // out what is going on below.
                    if (DEBUG_WALLPAPER) Slog.v(TAG, "Win " + w
                            + ": token animating, looking behind.");
                    continue;
                }
                break;
            } else if (w == mAnimator.mWindowDetachedWallpaper) {
                windowDetachedI = i;
            }
        }

        if (foundW == null && windowDetachedI >= 0) {
            if (DEBUG_WALLPAPER_LIGHT) Slog.v(TAG,
                    "Found animating detached wallpaper activity: #" + i + "=" + w);
            foundW = w;
            foundI = windowDetachedI;
        }

        if (mWallpaperTarget != foundW
                && (mLowerWallpaperTarget == null || mLowerWallpaperTarget != foundW)) {
            if (DEBUG_WALLPAPER_LIGHT) {
                Slog.v(TAG, "New wallpaper target: " + foundW
                        + " oldTarget: " + mWallpaperTarget);
            }

            mLowerWallpaperTarget = null;
            mUpperWallpaperTarget = null;

            WindowState oldW = mWallpaperTarget;
            mWallpaperTarget = foundW;
            targetChanged = true;

            // Now what is happening...  if the current and new targets are
            // animating, then we are in our super special mode!
            if (foundW != null && oldW != null) {
                boolean oldAnim = oldW.isAnimatingLw();
                boolean foundAnim = foundW.isAnimatingLw();
                if (DEBUG_WALLPAPER_LIGHT) {
                    Slog.v(TAG, "New animation: " + foundAnim
                            + " old animation: " + oldAnim);
                }
                if (foundAnim && oldAnim) {
                    int oldI = windows.indexOf(oldW);
                    if (DEBUG_WALLPAPER_LIGHT) {
                        Slog.v(TAG, "New i: " + foundI + " old i: " + oldI);
                    }
                    if (oldI >= 0) {
                        if (DEBUG_WALLPAPER_LIGHT) {
                            Slog.v(TAG, "Animating wallpapers: old#" + oldI
                                    + "=" + oldW + "; new#" + foundI
                                    + "=" + foundW);
                        }

                        // Set the new target correctly.
                        if (foundW.mAppToken != null && foundW.mAppToken.hiddenRequested) {
                            if (DEBUG_WALLPAPER_LIGHT) {
                                Slog.v(TAG, "Old wallpaper still the target.");
                            }
                            mWallpaperTarget = oldW;
                            foundW = oldW;
                            foundI = oldI;
                        }
                        // Now set the upper and lower wallpaper targets
                        // correctly, and make sure that we are positioning
                        // the wallpaper below the lower.
                        else if (foundI > oldI) {
                            // The new target is on top of the old one.
                            if (DEBUG_WALLPAPER_LIGHT) {
                                Slog.v(TAG, "Found target above old target.");
                            }
                            mUpperWallpaperTarget = foundW;
                            mLowerWallpaperTarget = oldW;
                            foundW = oldW;
                            foundI = oldI;
                        } else {
                            // The new target is below the old one.
                            if (DEBUG_WALLPAPER_LIGHT) {
                                Slog.v(TAG, "Found target below old target.");
                            }
                            mUpperWallpaperTarget = oldW;
                            mLowerWallpaperTarget = foundW;
                        }
                    }
                }
            }

        } else if (mLowerWallpaperTarget != null) {
            // Is it time to stop animating?
            if (!mLowerWallpaperTarget.isAnimatingLw() || !mUpperWallpaperTarget.isAnimatingLw()) {
                if (DEBUG_WALLPAPER_LIGHT) {
                    Slog.v(TAG, "No longer animating wallpaper targets!");
                }
                mLowerWallpaperTarget = null;
                mUpperWallpaperTarget = null;
                mWallpaperTarget = foundW;
                targetChanged = true;
            }
        }

        boolean visible = foundW != null;
        if (visible) {
            // The window is visible to the compositor...  but is it visible
            // to the user?  That is what the wallpaper cares about.
            visible = isWallpaperVisible(foundW);
            if (DEBUG_WALLPAPER) Slog.v(TAG, "Wallpaper visibility: " + visible);

            // If the wallpaper target is animating, we may need to copy
            // its layer adjustment.  Only do this if we are not transfering
            // between two wallpaper targets.
            mWallpaperAnimLayerAdjustment =
                    (mLowerWallpaperTarget == null && foundW.mAppToken != null)
                    ? foundW.mAppToken.mAppAnimator.animLayerAdjustment : 0;

            final int maxLayer = mPolicy.getMaxWallpaperLayer()
                    * TYPE_LAYER_MULTIPLIER
                    + TYPE_LAYER_OFFSET;

            // Now w is the window we are supposed to be behind...  but we
            // need to be sure to also be behind any of its attached windows,
            // AND any starting window associated with it, AND below the
            // maximum layer the policy allows for wallpapers.
            while (foundI > 0) {
                WindowState wb = windows.get(foundI-1);
                if (wb.mBaseLayer < maxLayer &&
                        wb.mAttachedWindow != foundW &&
                        (foundW.mAttachedWindow == null ||
                                wb.mAttachedWindow != foundW.mAttachedWindow) &&
                        (wb.mAttrs.type != TYPE_APPLICATION_STARTING ||
                                foundW.mToken == null || wb.mToken != foundW.mToken)) {
                    // This window is not related to the previous one in any
                    // interesting way, so stop here.
                    break;
                }
                foundW = wb;
                foundI--;
            }
        } else {
            if (DEBUG_WALLPAPER) Slog.v(TAG, "No wallpaper target");
        }

        if (foundW == null && topCurW != null) {
            // There is no wallpaper target, so it goes at the bottom.
            // We will assume it is the same place as last time, if known.
            foundW = topCurW;
            foundI = topCurI+1;
        } else {
            // Okay i is the position immediately above the wallpaper.  Look at
            // what is below it for later.
            foundW = foundI > 0 ? windows.get(foundI-1) : null;
        }

        if (visible) {
            if (mWallpaperTarget.mWallpaperX >= 0) {
                mLastWallpaperX = mWallpaperTarget.mWallpaperX;
                mLastWallpaperXStep = mWallpaperTarget.mWallpaperXStep;
            }
            if (mWallpaperTarget.mWallpaperY >= 0) {
                mLastWallpaperY = mWallpaperTarget.mWallpaperY;
                mLastWallpaperYStep = mWallpaperTarget.mWallpaperYStep;
            }
            if (mWallpaperTarget.mWallpaperDisplayOffsetX != Integer.MIN_VALUE) {
                mLastWallpaperDisplayOffsetX = mWallpaperTarget.mWallpaperDisplayOffsetX;
            }
            if (mWallpaperTarget.mWallpaperDisplayOffsetY != Integer.MIN_VALUE) {
                mLastWallpaperDisplayOffsetY = mWallpaperTarget.mWallpaperDisplayOffsetY;
            }
        }

        // Start stepping backwards from here, ensuring that our wallpaper windows
        // are correctly placed.
        int changed = 0;
        int curTokenIndex = mWallpaperTokens.size();
        while (curTokenIndex > 0) {
            curTokenIndex--;
            WindowToken token = mWallpaperTokens.get(curTokenIndex);
            if (token.hidden == visible) {
                if (DEBUG_WALLPAPER_LIGHT) Slog.d(TAG,
                        "Wallpaper token " + token + " hidden=" + !visible);
                changed |= ADJUST_WALLPAPER_VISIBILITY_CHANGED;
                token.hidden = !visible;
                // Need to do a layout to ensure the wallpaper now has the
                // correct size.
                getDefaultDisplayContentLocked().layoutNeeded = true;
            }

            int curWallpaperIndex = token.windows.size();
            while (curWallpaperIndex > 0) {
                curWallpaperIndex--;
                WindowState wallpaper = token.windows.get(curWallpaperIndex);

                if (visible) {
                    updateWallpaperOffsetLocked(wallpaper, dw, dh, false);
                }

                // First, make sure the client has the current visibility
                // state.
                dispatchWallpaperVisibility(wallpaper, visible);

                wallpaper.mWinAnimator.mAnimLayer = wallpaper.mLayer + mWallpaperAnimLayerAdjustment;
                if (DEBUG_LAYERS || DEBUG_WALLPAPER_LIGHT) Slog.v(TAG, "adjustWallpaper win "
                        + wallpaper + " anim layer: " + wallpaper.mWinAnimator.mAnimLayer);

                // First, if this window is at the current index, then all
                // is well.
                if (wallpaper == foundW) {
                    foundI--;
                    foundW = foundI > 0
                            ? windows.get(foundI-1) : null;
                    continue;
                }

                // The window didn't match...  the current wallpaper window,
                // wherever it is, is in the wrong place, so make sure it is
                // not in the list.
                int oldIndex = windows.indexOf(wallpaper);
                if (oldIndex >= 0) {
                    if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "Wallpaper removing at "
                            + oldIndex + ": " + wallpaper);
                    windows.remove(oldIndex);
                    mWindowsChanged = true;
                    if (oldIndex < foundI) {
                        foundI--;
                    }
                }

                // Now stick it in. For apps over wallpaper keep the wallpaper at the bottommost
                // layer. For keyguard over wallpaper put the wallpaper under the keyguard.
                int insertionIndex = 0;
                if (visible && foundW != null) {
                    final int type = foundW.mAttrs.type;
                    final int privateFlags = foundW.mAttrs.privateFlags;
                    if ((privateFlags & PRIVATE_FLAG_KEYGUARD) != 0
                            || type == TYPE_KEYGUARD_SCRIM) {
                        insertionIndex = windows.indexOf(foundW);
                    }
                }
                if (DEBUG_WALLPAPER_LIGHT || DEBUG_WINDOW_MOVEMENT || DEBUG_ADD_REMOVE) {
                    Slog.v(TAG, "Moving wallpaper " + wallpaper
                            + " from " + oldIndex + " to " + insertionIndex);
                }

                windows.add(insertionIndex, wallpaper);
                mWindowsChanged = true;
                changed |= ADJUST_WALLPAPER_LAYERS_CHANGED;
            }
        }

        /*
        final TaskStack targetStack =
                mWallpaperTarget == null ? null : mWallpaperTarget.getStack();
        if ((changed & ADJUST_WALLPAPER_LAYERS_CHANGED) != 0 &&
                targetStack != null && !targetStack.isHomeStack()) {
            // If the wallpaper target is not on the home stack then make sure that all windows
            // from other non-home stacks are above the wallpaper.
            for (i = foundI - 1; i >= 0; --i) {
                WindowState win = windows.get(i);
                if (!win.isVisibleLw()) {
                    continue;
                }
                final TaskStack winStack = win.getStack();
                if (winStack != null && !winStack.isHomeStack() && winStack != targetStack) {
                    windows.remove(i);
                    windows.add(foundI + 1, win);
                }
            }
        }
        */

        if (targetChanged && DEBUG_WALLPAPER_LIGHT) {
            Slog.d(TAG, "New wallpaper: target=" + mWallpaperTarget
                    + " lower=" + mLowerWallpaperTarget + " upper="
                    + mUpperWallpaperTarget);
        }

        return changed;
    }

    void setWallpaperAnimLayerAdjustmentLocked(int adj) {
        if (DEBUG_LAYERS || DEBUG_WALLPAPER) Slog.v(TAG,
                "Setting wallpaper layer adj to " + adj);
        mWallpaperAnimLayerAdjustment = adj;
        int curTokenIndex = mWallpaperTokens.size();
        while (curTokenIndex > 0) {
            curTokenIndex--;
            WindowToken token = mWallpaperTokens.get(curTokenIndex);
            int curWallpaperIndex = token.windows.size();
            while (curWallpaperIndex > 0) {
                curWallpaperIndex--;
                WindowState wallpaper = token.windows.get(curWallpaperIndex);
                wallpaper.mWinAnimator.mAnimLayer = wallpaper.mLayer + adj;
                if (DEBUG_LAYERS || DEBUG_WALLPAPER) Slog.v(TAG, "setWallpaper win "
                        + wallpaper + " anim layer: " + wallpaper.mWinAnimator.mAnimLayer);
            }
        }
    }

    boolean updateWallpaperOffsetLocked(WindowState wallpaperWin, int dw, int dh,
            boolean sync) {
        boolean changed = false;
        boolean rawChanged = false;
        float wpx = mLastWallpaperX >= 0 ? mLastWallpaperX : 0.5f;
        float wpxs = mLastWallpaperXStep >= 0 ? mLastWallpaperXStep : -1.0f;
        int availw = wallpaperWin.mFrame.right-wallpaperWin.mFrame.left-dw;
        int offset = availw > 0 ? -(int)(availw*wpx+.5f) : 0;
        if (mLastWallpaperDisplayOffsetX != Integer.MIN_VALUE) {
            offset += mLastWallpaperDisplayOffsetX;
        }
        changed = wallpaperWin.mXOffset != offset;
        if (changed) {
            if (DEBUG_WALLPAPER) Slog.v(TAG, "Update wallpaper "
                    + wallpaperWin + " x: " + offset);
            wallpaperWin.mXOffset = offset;
        }
        if (wallpaperWin.mWallpaperX != wpx || wallpaperWin.mWallpaperXStep != wpxs) {
            wallpaperWin.mWallpaperX = wpx;
            wallpaperWin.mWallpaperXStep = wpxs;
            rawChanged = true;
        }

        float wpy = mLastWallpaperY >= 0 ? mLastWallpaperY : 0.5f;
        float wpys = mLastWallpaperYStep >= 0 ? mLastWallpaperYStep : -1.0f;
        int availh = wallpaperWin.mFrame.bottom-wallpaperWin.mFrame.top-dh;
        offset = availh > 0 ? -(int)(availh*wpy+.5f) : 0;
        if (mLastWallpaperDisplayOffsetY != Integer.MIN_VALUE) {
            offset += mLastWallpaperDisplayOffsetY;
        }
        if (wallpaperWin.mYOffset != offset) {
            if (DEBUG_WALLPAPER) Slog.v(TAG, "Update wallpaper "
                    + wallpaperWin + " y: " + offset);
            changed = true;
            wallpaperWin.mYOffset = offset;
        }
        if (wallpaperWin.mWallpaperY != wpy || wallpaperWin.mWallpaperYStep != wpys) {
            wallpaperWin.mWallpaperY = wpy;
            wallpaperWin.mWallpaperYStep = wpys;
            rawChanged = true;
        }

        if (rawChanged && (wallpaperWin.mAttrs.privateFlags &
                    WindowManager.LayoutParams.PRIVATE_FLAG_WANTS_OFFSET_NOTIFICATIONS) != 0) {
            try {
                if (DEBUG_WALLPAPER) Slog.v(TAG, "Report new wp offset "
                        + wallpaperWin + " x=" + wallpaperWin.mWallpaperX
                        + " y=" + wallpaperWin.mWallpaperY);
                if (sync) {
                    mWaitingOnWallpaper = wallpaperWin;
                }
                wallpaperWin.mClient.dispatchWallpaperOffsets(
                        wallpaperWin.mWallpaperX, wallpaperWin.mWallpaperY,
                        wallpaperWin.mWallpaperXStep, wallpaperWin.mWallpaperYStep, sync);
                if (sync) {
                    if (mWaitingOnWallpaper != null) {
                        long start = SystemClock.uptimeMillis();
                        if ((mLastWallpaperTimeoutTime+WALLPAPER_TIMEOUT_RECOVERY)
                                < start) {
                            try {
                                if (DEBUG_WALLPAPER) Slog.v(TAG,
                                        "Waiting for offset complete...");
                                mWindowMap.wait(WALLPAPER_TIMEOUT);
                            } catch (InterruptedException e) {
                            }
                            if (DEBUG_WALLPAPER) Slog.v(TAG, "Offset complete!");
                            if ((start+WALLPAPER_TIMEOUT)
                                    < SystemClock.uptimeMillis()) {
                                Slog.i(TAG, "Timeout waiting for wallpaper to offset: "
                                        + wallpaperWin);
                                mLastWallpaperTimeoutTime = start;
                            }
                        }
                        mWaitingOnWallpaper = null;
                    }
                }
            } catch (RemoteException e) {
            }
        }

        return changed;
    }

    void wallpaperOffsetsComplete(IBinder window) {
        synchronized (mWindowMap) {
            if (mWaitingOnWallpaper != null &&
                    mWaitingOnWallpaper.mClient.asBinder() == window) {
                mWaitingOnWallpaper = null;
                mWindowMap.notifyAll();
            }
        }
    }

    void updateWallpaperOffsetLocked(WindowState changingTarget, boolean sync) {
        final DisplayContent displayContent = changingTarget.getDisplayContent();
        if (displayContent == null) {
            return;
        }
        final DisplayInfo displayInfo = displayContent.getDisplayInfo();
        final int dw = displayInfo.logicalWidth;
        final int dh = displayInfo.logicalHeight;

        WindowState target = mWallpaperTarget;
        if (target != null) {
            if (target.mWallpaperX >= 0) {
                mLastWallpaperX = target.mWallpaperX;
            } else if (changingTarget.mWallpaperX >= 0) {
                mLastWallpaperX = changingTarget.mWallpaperX;
            }
            if (target.mWallpaperY >= 0) {
                mLastWallpaperY = target.mWallpaperY;
            } else if (changingTarget.mWallpaperY >= 0) {
                mLastWallpaperY = changingTarget.mWallpaperY;
            }
            if (target.mWallpaperDisplayOffsetX != Integer.MIN_VALUE) {
                mLastWallpaperDisplayOffsetX = target.mWallpaperDisplayOffsetX;
            } else if (changingTarget.mWallpaperDisplayOffsetX != Integer.MIN_VALUE) {
                mLastWallpaperDisplayOffsetX = changingTarget.mWallpaperDisplayOffsetX;
            }
            if (target.mWallpaperDisplayOffsetY != Integer.MIN_VALUE) {
                mLastWallpaperDisplayOffsetY = target.mWallpaperDisplayOffsetY;
            } else if (changingTarget.mWallpaperDisplayOffsetY != Integer.MIN_VALUE) {
                mLastWallpaperDisplayOffsetY = changingTarget.mWallpaperDisplayOffsetY;
            }
        }

        int curTokenIndex = mWallpaperTokens.size();
        while (curTokenIndex > 0) {
            curTokenIndex--;
            WindowToken token = mWallpaperTokens.get(curTokenIndex);
            int curWallpaperIndex = token.windows.size();
            while (curWallpaperIndex > 0) {
                curWallpaperIndex--;
                WindowState wallpaper = token.windows.get(curWallpaperIndex);
                if (updateWallpaperOffsetLocked(wallpaper, dw, dh, sync)) {
                    WindowStateAnimator winAnimator = wallpaper.mWinAnimator;
                    winAnimator.computeShownFrameLocked();
                    // No need to lay out the windows - we can just set the wallpaper position
                    // directly.
                    winAnimator.setWallpaperOffset(wallpaper.mShownFrame);
                    // We only want to be synchronous with one wallpaper.
                    sync = false;
                }
            }
        }
    }

    /**
     * Check wallpaper for visiblity change and notify window if so.
     * @param wallpaper The wallpaper to test and notify.
     * @param visible Current visibility.
     */
    void dispatchWallpaperVisibility(final WindowState wallpaper, final boolean visible) {
        if (wallpaper.mWallpaperVisible != visible) {
            wallpaper.mWallpaperVisible = visible;
            try {
                if (DEBUG_VISIBILITY || DEBUG_WALLPAPER_LIGHT) Slog.v(TAG,
                        "Updating vis of wallpaper " + wallpaper
                        + ": " + visible + " from:\n" + Debug.getCallers(4, "  "));
                wallpaper.mClient.dispatchAppVisibility(visible);
            } catch (RemoteException e) {
            }
        }
    }

    void updateWallpaperVisibilityLocked() {
        final boolean visible = isWallpaperVisible(mWallpaperTarget);
        final DisplayContent displayContent = mWallpaperTarget.getDisplayContent();
        if (displayContent == null) {
            return;
        }
        final DisplayInfo displayInfo = displayContent.getDisplayInfo();
        final int dw = displayInfo.logicalWidth;
        final int dh = displayInfo.logicalHeight;

        int curTokenIndex = mWallpaperTokens.size();
        while (curTokenIndex > 0) {
            curTokenIndex--;
            WindowToken token = mWallpaperTokens.get(curTokenIndex);
            if (token.hidden == visible) {
                token.hidden = !visible;
                // Need to do a layout to ensure the wallpaper now has the
                // correct size.
                getDefaultDisplayContentLocked().layoutNeeded = true;
            }

            int curWallpaperIndex = token.windows.size();
            while (curWallpaperIndex > 0) {
                curWallpaperIndex--;
                WindowState wallpaper = token.windows.get(curWallpaperIndex);
                if (visible) {
                    updateWallpaperOffsetLocked(wallpaper, dw, dh, false);
                }

                dispatchWallpaperVisibility(wallpaper, visible);
            }
        }
    }

    public int addWindow(Session session, IWindow client, int seq,
            WindowManager.LayoutParams attrs, int viewVisibility, int displayId,
            Rect outContentInsets, InputChannel outInputChannel) {
        int[] appOp = new int[1];
        int res = mPolicy.checkAddPermission(attrs, appOp);
        if (res != WindowManagerGlobal.ADD_OKAY) {
            return res;
        }

        boolean reportNewConfig = false;
        WindowState attachedWindow = null;
        WindowState win = null;
        long origId;
        final int type = attrs.type;

        synchronized(mWindowMap) {
            if (!mDisplayReady) {
                throw new IllegalStateException("Display has not been initialialized");
            }

            final DisplayContent displayContent = getDisplayContentLocked(displayId);
            if (displayContent == null) {
                Slog.w(TAG, "Attempted to add window to a display that does not exist: "
                        + displayId + ".  Aborting.");
                return WindowManagerGlobal.ADD_INVALID_DISPLAY;
            }
            if (!displayContent.hasAccess(session.mUid)) {
                Slog.w(TAG, "Attempted to add window to a display for which the application "
                        + "does not have access: " + displayId + ".  Aborting.");
                return WindowManagerGlobal.ADD_INVALID_DISPLAY;
            }

            if (mWindowMap.containsKey(client.asBinder())) {
                Slog.w(TAG, "Window " + client + " is already added");
                return WindowManagerGlobal.ADD_DUPLICATE_ADD;
            }

            if (type >= FIRST_SUB_WINDOW && type <= LAST_SUB_WINDOW) {
                attachedWindow = windowForClientLocked(null, attrs.token, false);
                if (attachedWindow == null) {
                    Slog.w(TAG, "Attempted to add window with token that is not a window: "
                          + attrs.token + ".  Aborting.");
                    return WindowManagerGlobal.ADD_BAD_SUBWINDOW_TOKEN;
                }
                if (attachedWindow.mAttrs.type >= FIRST_SUB_WINDOW
                        && attachedWindow.mAttrs.type <= LAST_SUB_WINDOW) {
                    Slog.w(TAG, "Attempted to add window with token that is a sub-window: "
                            + attrs.token + ".  Aborting.");
                    return WindowManagerGlobal.ADD_BAD_SUBWINDOW_TOKEN;
                }
            }

            if (type == TYPE_PRIVATE_PRESENTATION && !displayContent.isPrivate()) {
                Slog.w(TAG, "Attempted to add private presentation window to a non-private display.  Aborting.");
                return WindowManagerGlobal.ADD_PERMISSION_DENIED;
            }

            boolean addToken = false;
            WindowToken token = mTokenMap.get(attrs.token);
            if (token == null) {
                if (type >= FIRST_APPLICATION_WINDOW && type <= LAST_APPLICATION_WINDOW) {
                    Slog.w(TAG, "Attempted to add application window with unknown token "
                          + attrs.token + ".  Aborting.");
                    return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
                }
                if (type == TYPE_INPUT_METHOD) {
                    Slog.w(TAG, "Attempted to add input method window with unknown token "
                          + attrs.token + ".  Aborting.");
                    return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
                }
                if (type == TYPE_VOICE_INTERACTION) {
                    Slog.w(TAG, "Attempted to add voice interaction window with unknown token "
                          + attrs.token + ".  Aborting.");
                    return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
                }
                if (type == TYPE_WALLPAPER) {
                    Slog.w(TAG, "Attempted to add wallpaper window with unknown token "
                          + attrs.token + ".  Aborting.");
                    return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
                }
                if (type == TYPE_DREAM) {
                    Slog.w(TAG, "Attempted to add Dream window with unknown token "
                          + attrs.token + ".  Aborting.");
                    return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
                }
                token = new WindowToken(this, attrs.token, -1, false);
                addToken = true;
            } else if (type >= FIRST_APPLICATION_WINDOW && type <= LAST_APPLICATION_WINDOW) {
                AppWindowToken atoken = token.appWindowToken;
                if (atoken == null) {
                    Slog.w(TAG, "Attempted to add window with non-application token "
                          + token + ".  Aborting.");
                    return WindowManagerGlobal.ADD_NOT_APP_TOKEN;
                } else if (atoken.removed) {
                    Slog.w(TAG, "Attempted to add window with exiting application token "
                          + token + ".  Aborting.");
                    return WindowManagerGlobal.ADD_APP_EXITING;
                }
                if (type == TYPE_APPLICATION_STARTING && atoken.firstWindowDrawn) {
                    // No need for this guy!
                    if (localLOGV) Slog.v(
                            TAG, "**** NO NEED TO START: " + attrs.getTitle());
                    return WindowManagerGlobal.ADD_STARTING_NOT_NEEDED;
                }
            } else if (type == TYPE_INPUT_METHOD) {
                if (token.windowType != TYPE_INPUT_METHOD) {
                    Slog.w(TAG, "Attempted to add input method window with bad token "
                            + attrs.token + ".  Aborting.");
                      return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
                }
            } else if (type == TYPE_VOICE_INTERACTION) {
                if (token.windowType != TYPE_VOICE_INTERACTION) {
                    Slog.w(TAG, "Attempted to add voice interaction window with bad token "
                            + attrs.token + ".  Aborting.");
                      return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
                }
            } else if (type == TYPE_WALLPAPER) {
                if (token.windowType != TYPE_WALLPAPER) {
                    Slog.w(TAG, "Attempted to add wallpaper window with bad token "
                            + attrs.token + ".  Aborting.");
                      return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
                }
            } else if (type == TYPE_DREAM) {
                if (token.windowType != TYPE_DREAM) {
                    Slog.w(TAG, "Attempted to add Dream window with bad token "
                            + attrs.token + ".  Aborting.");
                      return WindowManagerGlobal.ADD_BAD_APP_TOKEN;
                }
            } else if (token.appWindowToken != null) {
                Slog.w(TAG, "Non-null appWindowToken for system window of type=" + type);
                // It is not valid to use an app token with other system types; we will
                // instead make a new token for it (as if null had been passed in for the token).
                attrs.token = null;
                token = new WindowToken(this, null, -1, false);
                addToken = true;
            }

            win = new WindowState(this, session, client, token,
                    attachedWindow, appOp[0], seq, attrs, viewVisibility, displayContent);
            if (win.mDeathRecipient == null) {
                // Client has apparently died, so there is no reason to
                // continue.
                Slog.w(TAG, "Adding window client " + client.asBinder()
                        + " that is dead, aborting.");
                return WindowManagerGlobal.ADD_APP_EXITING;
            }

            if (win.getDisplayContent() == null) {
                Slog.w(TAG, "Adding window to Display that has been removed.");
                return WindowManagerGlobal.ADD_INVALID_DISPLAY;
            }

            mPolicy.adjustWindowParamsLw(win.mAttrs);
            win.setShowToOwnerOnlyLocked(mPolicy.checkShowToOwnerOnly(attrs));

            res = mPolicy.prepareAddWindowLw(win, attrs);
            if (res != WindowManagerGlobal.ADD_OKAY) {
                return res;
            }

            if (outInputChannel != null && (attrs.inputFeatures
                    & WindowManager.LayoutParams.INPUT_FEATURE_NO_INPUT_CHANNEL) == 0) {
                String name = win.makeInputChannelName();
                InputChannel[] inputChannels = InputChannel.openInputChannelPair(name);
                win.setInputChannel(inputChannels[0]);
                inputChannels[1].transferTo(outInputChannel);

                mInputManager.registerInputChannel(win.mInputChannel, win.mInputWindowHandle);
            }

            // From now on, no exceptions or errors allowed!

            res = WindowManagerGlobal.ADD_OKAY;

            origId = Binder.clearCallingIdentity();

            if (addToken) {
                mTokenMap.put(attrs.token, token);
            }
            win.attach();
            mWindowMap.put(client.asBinder(), win);
            if (win.mAppOp != AppOpsManager.OP_NONE) {
                if (mAppOps.startOpNoThrow(win.mAppOp, win.getOwningUid(), win.getOwningPackage())
                        != AppOpsManager.MODE_ALLOWED) {
                    win.setAppOpVisibilityLw(false);
                }
            }

            if (type == TYPE_APPLICATION_STARTING && token.appWindowToken != null) {
                token.appWindowToken.startingWindow = win;
                if (DEBUG_STARTING_WINDOW) Slog.v (TAG, "addWindow: " + token.appWindowToken
                        + " startingWindow=" + win);
            }

            boolean imMayMove = true;

            if (type == TYPE_INPUT_METHOD) {
                win.mGivenInsetsPending = true;
                mInputMethodWindow = win;
                addInputMethodWindowToListLocked(win);
                imMayMove = false;
            } else if (type == TYPE_INPUT_METHOD_DIALOG) {
                mInputMethodDialogs.add(win);
                addWindowToListInOrderLocked(win, true);
                moveInputMethodDialogsLocked(findDesiredInputMethodWindowIndexLocked(true));
                imMayMove = false;
            } else {
                addWindowToListInOrderLocked(win, true);
                if (type == TYPE_WALLPAPER) {
                    mLastWallpaperTimeoutTime = 0;
                    displayContent.pendingLayoutChanges |= FINISH_LAYOUT_REDO_WALLPAPER;
                } else if ((attrs.flags&FLAG_SHOW_WALLPAPER) != 0) {
                    displayContent.pendingLayoutChanges |= FINISH_LAYOUT_REDO_WALLPAPER;
                } else if (mWallpaperTarget != null
                        && mWallpaperTarget.mLayer >= win.mBaseLayer) {
                    // If there is currently a wallpaper being shown, and
                    // the base layer of the new window is below the current
                    // layer of the target window, then adjust the wallpaper.
                    // This is to avoid a new window being placed between the
                    // wallpaper and its target.
                    displayContent.pendingLayoutChanges |= FINISH_LAYOUT_REDO_WALLPAPER;
                }
            }

            win.mWinAnimator.mEnterAnimationPending = true;

            if (displayContent.isDefaultDisplay) {
                mPolicy.getContentInsetHintLw(attrs, outContentInsets);
            } else {
                outContentInsets.setEmpty();
            }

            if (mInTouchMode) {
                res |= WindowManagerGlobal.ADD_FLAG_IN_TOUCH_MODE;
            }
            if (win.mAppToken == null || !win.mAppToken.clientHidden) {
                res |= WindowManagerGlobal.ADD_FLAG_APP_VISIBLE;
            }

            mInputMonitor.setUpdateInputWindowsNeededLw();

            boolean focusChanged = false;
            if (win.canReceiveKeys()) {
                focusChanged = updateFocusedWindowLocked(UPDATE_FOCUS_WILL_ASSIGN_LAYERS,
                        false /*updateInputWindows*/);
                if (focusChanged) {
                    imMayMove = false;
                }
            }

            if (imMayMove) {
                moveInputMethodWindowsIfNeededLocked(false);
            }

            assignLayersLocked(displayContent.getWindowList());
            // Don't do layout here, the window must call
            // relayout to be displayed, so we'll do it there.

            if (focusChanged) {
                mInputMonitor.setInputFocusLw(mCurrentFocus, false /*updateInputWindows*/);
            }
            mInputMonitor.updateInputWindowsLw(false /*force*/);

            if (localLOGV) Slog.v(
                TAG, "New client " + client.asBinder()
                + ": window=" + win);

            if (win.isVisibleOrAdding() && updateOrientationFromAppTokensLocked(false)) {
                reportNewConfig = true;
            }
        }

        if (reportNewConfig) {
            sendNewConfiguration();
        }

        Binder.restoreCallingIdentity(origId);

        return res;
    }

    /**
     * Returns whether screen capture is disabled for all windows of a specific user.
     */
    boolean isScreenCaptureDisabledLocked(int userId) {
        Boolean disabled = mScreenCaptureDisabled.get(userId);
        if (disabled == null) {
            return false;
        }
        return disabled;
    }

    /**
     * Set mScreenCaptureDisabled for specific user
     */
    @Override
    public void setScreenCaptureDisabled(int userId, boolean disabled) {
        int callingUid = Binder.getCallingUid();
        if (callingUid != Process.SYSTEM_UID) {
            throw new SecurityException("Only system can call setScreenCaptureDisabled.");
        }

        synchronized(mWindowMap) {
            mScreenCaptureDisabled.put(userId, disabled);
        }
    }

    public void removeWindow(Session session, IWindow client) {
        synchronized(mWindowMap) {
            WindowState win = windowForClientLocked(session, client, false);
            if (win == null) {
                return;
            }
            removeWindowLocked(session, win);
        }
    }

    public void removeWindowLocked(Session session, WindowState win) {
        if (win.mAttrs.type == TYPE_APPLICATION_STARTING) {
            if (DEBUG_STARTING_WINDOW) Slog.d(TAG, "Starting window removed " + win);
        }

        if (localLOGV || DEBUG_FOCUS || DEBUG_FOCUS_LIGHT && win==mCurrentFocus) Slog.v(
                TAG, "Remove " + win + " client="
                + Integer.toHexString(System.identityHashCode(win.mClient.asBinder()))
                + ", surface=" + win.mWinAnimator.mSurfaceControl + " Callers="
                + Debug.getCallers(4));

        final long origId = Binder.clearCallingIdentity();

        win.disposeInputChannel();

        if (DEBUG_APP_TRANSITIONS) Slog.v(
                TAG, "Remove " + win + ": mSurface=" + win.mWinAnimator.mSurfaceControl
                + " mExiting=" + win.mExiting
                + " isAnimating=" + win.mWinAnimator.isAnimating()
                + " app-animation="
                + (win.mAppToken != null ? win.mAppToken.mAppAnimator.animation : null)
                + " inPendingTransaction="
                + (win.mAppToken != null ? win.mAppToken.inPendingTransaction : false)
                + " mDisplayFrozen=" + mDisplayFrozen);
        // Visibility of the removed window. Will be used later to update orientation later on.
        boolean wasVisible = false;
        // First, see if we need to run an animation.  If we do, we have
        // to hold off on removing the window until the animation is done.
        // If the display is frozen, just remove immediately, since the
        // animation wouldn't be seen.
        if (win.mHasSurface && okToDisplay()) {
            // If we are not currently running the exit animation, we
            // need to see about starting one.
            wasVisible = win.isWinVisibleLw();
            if (wasVisible) {

                int transit = WindowManagerPolicy.TRANSIT_EXIT;
                if (win.mAttrs.type == TYPE_APPLICATION_STARTING) {
                    transit = WindowManagerPolicy.TRANSIT_PREVIEW_DONE;
                }
                // Try starting an animation.
                if (win.mWinAnimator.applyAnimationLocked(transit, false)) {
                    win.mExiting = true;
                }
                //TODO (multidisplay): Magnification is supported only for the default display.
                if (mAccessibilityController != null
                        && win.getDisplayId() == Display.DEFAULT_DISPLAY) {
                    mAccessibilityController.onWindowTransitionLocked(win, transit);
                }
            }
            if (win.mExiting || win.mWinAnimator.isAnimating()) {
                // The exit animation is running... wait for it!
                //Slog.i(TAG, "*** Running exit animation...");
                win.mExiting = true;
                win.mRemoveOnExit = true;
                final DisplayContent displayContent = win.getDisplayContent();
                if (displayContent != null) {
                    displayContent.layoutNeeded = true;
                }
                final boolean focusChanged = updateFocusedWindowLocked(
                        UPDATE_FOCUS_WILL_PLACE_SURFACES, false /*updateInputWindows*/);
                performLayoutAndPlaceSurfacesLocked();
                if (win.mAppToken != null) {
                    win.mAppToken.updateReportedVisibilityLocked();
                }
                if (focusChanged) {
                    mInputMonitor.updateInputWindowsLw(false /*force*/);
                }
                //dump();
                Binder.restoreCallingIdentity(origId);
                return;
            }
        }

        removeWindowInnerLocked(session, win);
        // Removing a visible window will effect the computed orientation
        // So just update orientation if needed.
        if (wasVisible && updateOrientationFromAppTokensLocked(false)) {
            mH.sendEmptyMessage(H.SEND_NEW_CONFIGURATION);
        }
        updateFocusedWindowLocked(UPDATE_FOCUS_NORMAL, true /*updateInputWindows*/);
        Binder.restoreCallingIdentity(origId);
    }

    void removeWindowInnerLocked(Session session, WindowState win) {
        if (win.mRemoved) {
            // Nothing to do.
            return;
        }

        for (int i=win.mChildWindows.size()-1; i>=0; i--) {
            WindowState cwin = win.mChildWindows.get(i);
            Slog.w(TAG, "Force-removing child win " + cwin + " from container "
                    + win);
            removeWindowInnerLocked(cwin.mSession, cwin);
        }

        win.mRemoved = true;

        if (mInputMethodTarget == win) {
            moveInputMethodWindowsIfNeededLocked(false);
        }

        if (false) {
            RuntimeException e = new RuntimeException("here");
            e.fillInStackTrace();
            Slog.w(TAG, "Removing window " + win, e);
        }

        mPolicy.removeWindowLw(win);
        win.removeLocked();

        if (DEBUG_ADD_REMOVE) Slog.v(TAG, "removeWindowInnerLocked: " + win);
        mWindowMap.remove(win.mClient.asBinder());
        if (win.mAppOp != AppOpsManager.OP_NONE) {
            mAppOps.finishOp(win.mAppOp, win.getOwningUid(), win.getOwningPackage());
        }

        mPendingRemove.remove(win);
        mResizingWindows.remove(win);
        mWindowsChanged = true;
        if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "Final remove of window: " + win);

        if (mInputMethodWindow == win) {
            mInputMethodWindow = null;
        } else if (win.mAttrs.type == TYPE_INPUT_METHOD_DIALOG) {
            mInputMethodDialogs.remove(win);
        }

        final WindowToken token = win.mToken;
        final AppWindowToken atoken = win.mAppToken;
        if (DEBUG_ADD_REMOVE) Slog.v(TAG, "Removing " + win + " from " + token);
        token.windows.remove(win);
        if (atoken != null) {
            atoken.allAppWindows.remove(win);
        }
        if (localLOGV) Slog.v(
                TAG, "**** Removing window " + win + ": count="
                + token.windows.size());
        if (token.windows.size() == 0) {
            if (!token.explicit) {
                mTokenMap.remove(token.token);
            } else if (atoken != null) {
                atoken.firstWindowDrawn = false;
            }
        }

        if (atoken != null) {
            if (atoken.startingWindow == win) {
                if (DEBUG_STARTING_WINDOW) Slog.v(TAG, "Nulling startingWindow " + win);
                atoken.startingWindow = null;
            } else if (atoken.allAppWindows.size() == 0 && atoken.startingData != null) {
                // If this is the last window and we had requested a starting
                // transition window, well there is no point now.
                if (DEBUG_STARTING_WINDOW) Slog.v(TAG, "Nulling last startingWindow");
                atoken.startingData = null;
            } else if (atoken.allAppWindows.size() == 1 && atoken.startingView != null) {
                // If this is the last window except for a starting transition
                // window, we need to get rid of the starting transition.
                scheduleRemoveStartingWindow(atoken);
            }
        }

        if (win.mAttrs.type == TYPE_WALLPAPER) {
            mLastWallpaperTimeoutTime = 0;
            getDefaultDisplayContentLocked().pendingLayoutChanges |=
                    WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
        } else if ((win.mAttrs.flags&FLAG_SHOW_WALLPAPER) != 0) {
            getDefaultDisplayContentLocked().pendingLayoutChanges |=
                    WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
        }

        final WindowList windows = win.getWindowList();
        if (windows != null) {
            windows.remove(win);
            if (!mInLayout) {
                assignLayersLocked(windows);
                final DisplayContent displayContent = win.getDisplayContent();
                if (displayContent != null) {
                    displayContent.layoutNeeded = true;
                }
                performLayoutAndPlaceSurfacesLocked();
                if (win.mAppToken != null) {
                    win.mAppToken.updateReportedVisibilityLocked();
                }
            }
        }

        mInputMonitor.updateInputWindowsLw(true /*force*/);
    }

    public void updateAppOpsState() {
        synchronized(mWindowMap) {
            final int numDisplays = mDisplayContents.size();
            for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                final WindowList windows = mDisplayContents.valueAt(displayNdx).getWindowList();
                final int numWindows = windows.size();
                for (int winNdx = 0; winNdx < numWindows; ++winNdx) {
                    final WindowState win = windows.get(winNdx);
                    if (win.mAppOp != AppOpsManager.OP_NONE) {
                        final int mode = mAppOps.checkOpNoThrow(win.mAppOp, win.getOwningUid(),
                                win.getOwningPackage());
                        win.setAppOpVisibilityLw(mode == AppOpsManager.MODE_ALLOWED);
                    }
                }
            }
        }
    }

    static void logSurface(WindowState w, String msg, RuntimeException where) {
        String str = "  SURFACE " + msg + ": " + w;
        if (where != null) {
            Slog.i(TAG, str, where);
        } else {
            Slog.i(TAG, str);
        }
    }

    static void logSurface(SurfaceControl s, String title, String msg, RuntimeException where) {
        String str = "  SURFACE " + s + ": " + msg + " / " + title;
        if (where != null) {
            Slog.i(TAG, str, where);
        } else {
            Slog.i(TAG, str);
        }
    }

    void setTransparentRegionWindow(Session session, IWindow client, Region region) {
        long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mWindowMap) {
                WindowState w = windowForClientLocked(session, client, false);
                if ((w != null) && w.mHasSurface) {
                    w.mWinAnimator.setTransparentRegionHintLocked(region);
                }
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    void setInsetsWindow(Session session, IWindow client,
            int touchableInsets, Rect contentInsets,
            Rect visibleInsets, Region touchableRegion) {
        long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mWindowMap) {
                WindowState w = windowForClientLocked(session, client, false);
                if (w != null) {
                    w.mGivenInsetsPending = false;
                    w.mGivenContentInsets.set(contentInsets);
                    w.mGivenVisibleInsets.set(visibleInsets);
                    w.mGivenTouchableRegion.set(touchableRegion);
                    w.mTouchableInsets = touchableInsets;
                    if (w.mGlobalScale != 1) {
                        w.mGivenContentInsets.scale(w.mGlobalScale);
                        w.mGivenVisibleInsets.scale(w.mGlobalScale);
                        w.mGivenTouchableRegion.scale(w.mGlobalScale);
                    }
                    final DisplayContent displayContent = w.getDisplayContent();
                    if (displayContent != null) {
                        displayContent.layoutNeeded = true;
                    }
                    performLayoutAndPlaceSurfacesLocked();
                }
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    public void getWindowDisplayFrame(Session session, IWindow client,
            Rect outDisplayFrame) {
        synchronized(mWindowMap) {
            WindowState win = windowForClientLocked(session, client, false);
            if (win == null) {
                outDisplayFrame.setEmpty();
                return;
            }
            outDisplayFrame.set(win.mDisplayFrame);
        }
    }

    public void setWindowWallpaperPositionLocked(WindowState window, float x, float y,
            float xStep, float yStep) {
        if (window.mWallpaperX != x || window.mWallpaperY != y)  {
            window.mWallpaperX = x;
            window.mWallpaperY = y;
            window.mWallpaperXStep = xStep;
            window.mWallpaperYStep = yStep;
            updateWallpaperOffsetLocked(window, true);
        }
    }

    void wallpaperCommandComplete(IBinder window, Bundle result) {
        synchronized (mWindowMap) {
            if (mWaitingOnWallpaper != null &&
                    mWaitingOnWallpaper.mClient.asBinder() == window) {
                mWaitingOnWallpaper = null;
                mWindowMap.notifyAll();
            }
        }
    }

    public void setWindowWallpaperDisplayOffsetLocked(WindowState window, int x, int y) {
        if (window.mWallpaperDisplayOffsetX != x || window.mWallpaperDisplayOffsetY != y)  {
            window.mWallpaperDisplayOffsetX = x;
            window.mWallpaperDisplayOffsetY = y;
            updateWallpaperOffsetLocked(window, true);
        }
    }

    public Bundle sendWindowWallpaperCommandLocked(WindowState window,
            String action, int x, int y, int z, Bundle extras, boolean sync) {
        if (window == mWallpaperTarget || window == mLowerWallpaperTarget
                || window == mUpperWallpaperTarget) {
            boolean doWait = sync;
            int curTokenIndex = mWallpaperTokens.size();
            while (curTokenIndex > 0) {
                curTokenIndex--;
                WindowToken token = mWallpaperTokens.get(curTokenIndex);
                int curWallpaperIndex = token.windows.size();
                while (curWallpaperIndex > 0) {
                    curWallpaperIndex--;
                    WindowState wallpaper = token.windows.get(curWallpaperIndex);
                    try {
                        wallpaper.mClient.dispatchWallpaperCommand(action,
                                x, y, z, extras, sync);
                        // We only want to be synchronous with one wallpaper.
                        sync = false;
                    } catch (RemoteException e) {
                    }
                }
            }

            if (doWait) {
                // XXX Need to wait for result.
            }
        }

        return null;
    }

    public void setUniverseTransformLocked(WindowState window, float alpha,
            float offx, float offy, float dsdx, float dtdx, float dsdy, float dtdy) {
        Transformation transform = window.mWinAnimator.mUniverseTransform;
        transform.setAlpha(alpha);
        Matrix matrix = transform.getMatrix();
        matrix.getValues(mTmpFloats);
        mTmpFloats[Matrix.MTRANS_X] = offx;
        mTmpFloats[Matrix.MTRANS_Y] = offy;
        mTmpFloats[Matrix.MSCALE_X] = dsdx;
        mTmpFloats[Matrix.MSKEW_Y] = dtdx;
        mTmpFloats[Matrix.MSKEW_X] = dsdy;
        mTmpFloats[Matrix.MSCALE_Y] = dtdy;
        matrix.setValues(mTmpFloats);
        final DisplayContent displayContent = window.getDisplayContent();
        if (displayContent == null) {
            return;
        }

        final DisplayInfo displayInfo = displayContent.getDisplayInfo();
        final RectF dispRect = new RectF(0, 0,
                displayInfo.logicalWidth, displayInfo.logicalHeight);
        matrix.mapRect(dispRect);
        window.mGivenTouchableRegion.set(0, 0,
                displayInfo.logicalWidth, displayInfo.logicalHeight);
        window.mGivenTouchableRegion.op((int)dispRect.left, (int)dispRect.top,
                (int)dispRect.right, (int)dispRect.bottom, Region.Op.DIFFERENCE);
        window.mTouchableInsets = ViewTreeObserver.InternalInsetsInfo.TOUCHABLE_INSETS_REGION;
        displayContent.layoutNeeded = true;
        performLayoutAndPlaceSurfacesLocked();
    }

    public void onRectangleOnScreenRequested(IBinder token, Rect rectangle) {
        synchronized (mWindowMap) {
            if (mAccessibilityController != null) {
                WindowState window = mWindowMap.get(token);
                //TODO (multidisplay): Magnification is supported only for the default display.
                if (window != null && window.getDisplayId() == Display.DEFAULT_DISPLAY) {
                    mAccessibilityController.onRectangleOnScreenRequestedLocked(rectangle);
                }
            }
        }
    }

    public IWindowId getWindowId(IBinder token) {
        synchronized (mWindowMap) {
            WindowState window = mWindowMap.get(token);
            return window != null ? window.mWindowId : null;
        }
    }

    public int relayoutWindow(Session session, IWindow client, int seq,
            WindowManager.LayoutParams attrs, int requestedWidth,
            int requestedHeight, int viewVisibility, int flags,
            Rect outFrame, Rect outOverscanInsets, Rect outContentInsets,
            Rect outVisibleInsets, Rect outStableInsets, Configuration outConfig,
            Surface outSurface) {
        boolean toBeDisplayed = false;
        boolean inTouchMode;
        boolean configChanged;
        boolean surfaceChanged = false;
        boolean animating;
        boolean hasStatusBarPermission =
                mContext.checkCallingOrSelfPermission(android.Manifest.permission.STATUS_BAR)
                        == PackageManager.PERMISSION_GRANTED;

        long origId = Binder.clearCallingIdentity();

        synchronized(mWindowMap) {
            WindowState win = windowForClientLocked(session, client, false);
            if (win == null) {
                return 0;
            }
            WindowStateAnimator winAnimator = win.mWinAnimator;
            if (win.mRequestedWidth != requestedWidth
                    || win.mRequestedHeight != requestedHeight) {
                win.mLayoutNeeded = true;
                win.mRequestedWidth = requestedWidth;
                win.mRequestedHeight = requestedHeight;
            }

            if (attrs != null) {
                mPolicy.adjustWindowParamsLw(attrs);
            }

            // if they don't have the permission, mask out the status bar bits
            int systemUiVisibility = 0;
            if (attrs != null) {
                systemUiVisibility = (attrs.systemUiVisibility|attrs.subtreeSystemUiVisibility);
                if ((systemUiVisibility & StatusBarManager.DISABLE_MASK) != 0) {
                    if (!hasStatusBarPermission) {
                        systemUiVisibility &= ~StatusBarManager.DISABLE_MASK;
                    }
                }
            }

            if (attrs != null && seq == win.mSeq) {
                win.mSystemUiVisibility = systemUiVisibility;
            }

            winAnimator.mSurfaceDestroyDeferred =
                    (flags&WindowManagerGlobal.RELAYOUT_DEFER_SURFACE_DESTROY) != 0;

            int attrChanges = 0;
            int flagChanges = 0;
            if (attrs != null) {
                if (win.mAttrs.type != attrs.type) {
                    throw new IllegalArgumentException(
                            "Window type can not be changed after the window is added.");
                }
                flagChanges = win.mAttrs.flags ^= attrs.flags;
                attrChanges = win.mAttrs.copyFrom(attrs);
                if ((attrChanges & (WindowManager.LayoutParams.LAYOUT_CHANGED
                        | WindowManager.LayoutParams.SYSTEM_UI_VISIBILITY_CHANGED)) != 0) {
                    win.mLayoutNeeded = true;
                }
            }

            if (DEBUG_LAYOUT) Slog.v(TAG, "Relayout " + win + ": viewVisibility=" + viewVisibility
                    + " req=" + requestedWidth + "x" + requestedHeight + " " + win.mAttrs);

            win.mEnforceSizeCompat =
                    (win.mAttrs.privateFlags & PRIVATE_FLAG_COMPATIBLE_WINDOW) != 0;

            if ((attrChanges & WindowManager.LayoutParams.ALPHA_CHANGED) != 0) {
                winAnimator.mAlpha = attrs.alpha;
            }

            final boolean scaledWindow =
                ((win.mAttrs.flags & WindowManager.LayoutParams.FLAG_SCALED) != 0);

            if (scaledWindow) {
                // requested{Width|Height} Surface's physical size
                // attrs.{width|height} Size on screen
                win.mHScale = (attrs.width  != requestedWidth)  ?
                        (attrs.width  / (float)requestedWidth) : 1.0f;
                win.mVScale = (attrs.height != requestedHeight) ?
                        (attrs.height / (float)requestedHeight) : 1.0f;
            } else {
                win.mHScale = win.mVScale = 1;
            }

            boolean imMayMove = (flagChanges & (FLAG_ALT_FOCUSABLE_IM | FLAG_NOT_FOCUSABLE)) != 0;

            final boolean isDefaultDisplay = win.isDefaultDisplay();
            boolean focusMayChange = isDefaultDisplay && (win.mViewVisibility != viewVisibility
                    || ((flagChanges & FLAG_NOT_FOCUSABLE) != 0)
                    || (!win.mRelayoutCalled));

            boolean wallpaperMayMove = win.mViewVisibility != viewVisibility
                    && (win.mAttrs.flags & FLAG_SHOW_WALLPAPER) != 0;
            wallpaperMayMove |= (flagChanges & FLAG_SHOW_WALLPAPER) != 0;

            win.mRelayoutCalled = true;
            final int oldVisibility = win.mViewVisibility;
            win.mViewVisibility = viewVisibility;
            if (DEBUG_SCREEN_ON) {
                RuntimeException stack = new RuntimeException();
                stack.fillInStackTrace();
                Slog.i(TAG, "Relayout " + win + ": oldVis=" + oldVisibility
                        + " newVis=" + viewVisibility, stack);
            }
            if (viewVisibility == View.VISIBLE &&
                    (win.mAppToken == null || !win.mAppToken.clientHidden)) {
                toBeDisplayed = !win.isVisibleLw();
                if (win.mExiting) {
                    winAnimator.cancelExitAnimationForNextAnimationLocked();
                    win.mExiting = false;
                }
                if (win.mDestroying) {
                    win.mDestroying = false;
                    mDestroySurface.remove(win);
                }
                if (oldVisibility == View.GONE) {
                    winAnimator.mEnterAnimationPending = true;
                }
                if (toBeDisplayed) {
                    if (win.isDrawnLw() && okToDisplay()) {
                        winAnimator.applyEnterAnimationLocked();
                    }
                    if ((win.mAttrs.flags
                            & WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON) != 0) {
                        if (DEBUG_VISIBILITY) Slog.v(TAG,
                                "Relayout window turning screen on: " + win);
                        win.mTurnOnScreen = true;
                    }
                    if (win.isConfigChanged()) {
                        if (DEBUG_CONFIGURATION) Slog.i(TAG, "Window " + win
                                + " visible with new config: " + mCurConfiguration);
                        outConfig.setTo(mCurConfiguration);
                    }
                }
                if ((attrChanges&WindowManager.LayoutParams.FORMAT_CHANGED) != 0) {
                    // To change the format, we need to re-build the surface.
                    winAnimator.destroySurfaceLocked();
                    toBeDisplayed = true;
                    surfaceChanged = true;
                }
                try {
                    if (!win.mHasSurface) {
                        surfaceChanged = true;
                    }
                    SurfaceControl surfaceControl = winAnimator.createSurfaceLocked();
                    if (surfaceControl != null) {
                        outSurface.copyFrom(surfaceControl);
                        if (SHOW_TRANSACTIONS) Slog.i(TAG,
                                "  OUT SURFACE " + outSurface + ": copied");
                    } else {
                        // For some reason there isn't a surface.  Clear the
                        // caller's object so they see the same state.
                        outSurface.release();
                    }
                } catch (Exception e) {
                    mInputMonitor.updateInputWindowsLw(true /*force*/);

                    Slog.w(TAG, "Exception thrown when creating surface for client "
                             + client + " (" + win.mAttrs.getTitle() + ")",
                             e);
                    Binder.restoreCallingIdentity(origId);
                    return 0;
                }
                if (toBeDisplayed) {
                    focusMayChange = isDefaultDisplay;
                }
                if (win.mAttrs.type == TYPE_INPUT_METHOD
                        && mInputMethodWindow == null) {
                    mInputMethodWindow = win;
                    imMayMove = true;
                }
                if (win.mAttrs.type == TYPE_BASE_APPLICATION
                        && win.mAppToken != null
                        && win.mAppToken.startingWindow != null) {
                    // Special handling of starting window over the base
                    // window of the app: propagate lock screen flags to it,
                    // to provide the correct semantics while starting.
                    final int mask =
                        WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                        | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
                        | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON;
                    WindowManager.LayoutParams sa = win.mAppToken.startingWindow.mAttrs;
                    sa.flags = (sa.flags&~mask) | (win.mAttrs.flags&mask);
                }
            } else {
                winAnimator.mEnterAnimationPending = false;
                if (winAnimator.mSurfaceControl != null) {
                    if (DEBUG_VISIBILITY) Slog.i(TAG, "Relayout invis " + win
                            + ": mExiting=" + win.mExiting);
                    // If we are not currently running the exit animation, we
                    // need to see about starting one.
                    if (!win.mExiting) {
                        surfaceChanged = true;
                        // Try starting an animation; if there isn't one, we
                        // can destroy the surface right away.
                        int transit = WindowManagerPolicy.TRANSIT_EXIT;
                        if (win.mAttrs.type == TYPE_APPLICATION_STARTING) {
                            transit = WindowManagerPolicy.TRANSIT_PREVIEW_DONE;
                        }
                        if (win.isWinVisibleLw() &&
                                winAnimator.applyAnimationLocked(transit, false)) {
                            focusMayChange = isDefaultDisplay;
                            win.mExiting = true;
                        } else if (win.mWinAnimator.isAnimating()) {
                            // Currently in a hide animation... turn this into
                            // an exit.
                            win.mExiting = true;
                        } else if (win == mWallpaperTarget) {
                            // If the wallpaper is currently behind this
                            // window, we need to change both of them inside
                            // of a transaction to avoid artifacts.
                            win.mExiting = true;
                            win.mWinAnimator.mAnimating = true;
                        } else {
                            if (mInputMethodWindow == win) {
                                mInputMethodWindow = null;
                            }
                            winAnimator.destroySurfaceLocked();
                        }
                        //TODO (multidisplay): Magnification is supported only for the default
                        if (mAccessibilityController != null
                                && win.getDisplayId() == Display.DEFAULT_DISPLAY) {
                            mAccessibilityController.onWindowTransitionLocked(win, transit);
                        }
                    }
                }

                outSurface.release();
                if (DEBUG_VISIBILITY) Slog.i(TAG, "Releasing surface in: " + win);
            }

            if (focusMayChange) {
                //System.out.println("Focus may change: " + win.mAttrs.getTitle());
                if (updateFocusedWindowLocked(UPDATE_FOCUS_WILL_PLACE_SURFACES,
                        false /*updateInputWindows*/)) {
                    imMayMove = false;
                }
                //System.out.println("Relayout " + win + ": focus=" + mCurrentFocus);
            }

            // updateFocusedWindowLocked() already assigned layers so we only need to
            // reassign them at this point if the IM window state gets shuffled
            if (imMayMove && (moveInputMethodWindowsIfNeededLocked(false) || toBeDisplayed)) {
                // Little hack here -- we -should- be able to rely on the
                // function to return true if the IME has moved and needs
                // its layer recomputed.  However, if the IME was hidden
                // and isn't actually moved in the list, its layer may be
                // out of data so we make sure to recompute it.
                assignLayersLocked(win.getWindowList());
            }

            if (wallpaperMayMove) {
                getDefaultDisplayContentLocked().pendingLayoutChanges |=
                        WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
            }

            final DisplayContent displayContent = win.getDisplayContent();
            if (displayContent != null) {
                displayContent.layoutNeeded = true;
            }
            win.mGivenInsetsPending = (flags&WindowManagerGlobal.RELAYOUT_INSETS_PENDING) != 0;
            configChanged = updateOrientationFromAppTokensLocked(false);
            performLayoutAndPlaceSurfacesLocked();
            if (toBeDisplayed && win.mIsWallpaper) {
                DisplayInfo displayInfo = getDefaultDisplayInfoLocked();
                updateWallpaperOffsetLocked(win,
                        displayInfo.logicalWidth, displayInfo.logicalHeight, false);
            }
            if (win.mAppToken != null) {
                win.mAppToken.updateReportedVisibilityLocked();
            }
            outFrame.set(win.mCompatFrame);
            outOverscanInsets.set(win.mOverscanInsets);
            outContentInsets.set(win.mContentInsets);
            outVisibleInsets.set(win.mVisibleInsets);
            outStableInsets.set(win.mStableInsets);
            if (localLOGV) Slog.v(
                TAG, "Relayout given client " + client.asBinder()
                + ", requestedWidth=" + requestedWidth
                + ", requestedHeight=" + requestedHeight
                + ", viewVisibility=" + viewVisibility
                + "\nRelayout returning frame=" + outFrame
                + ", surface=" + outSurface);

            if (localLOGV || DEBUG_FOCUS) Slog.v(
                TAG, "Relayout of " + win + ": focusMayChange=" + focusMayChange);

            inTouchMode = mInTouchMode;
            animating = mAnimator.mAnimating && win.mWinAnimator.isAnimating();
            if (animating && !mRelayoutWhileAnimating.contains(win)) {
                mRelayoutWhileAnimating.add(win);
            }

            mInputMonitor.updateInputWindowsLw(true /*force*/);

            if (DEBUG_LAYOUT) {
                Slog.v(TAG, "Relayout complete " + win + ": outFrame=" + outFrame.toShortString());
            }
        }

        if (configChanged) {
            sendNewConfiguration();
        }

        Binder.restoreCallingIdentity(origId);

        return (inTouchMode ? WindowManagerGlobal.RELAYOUT_RES_IN_TOUCH_MODE : 0)
                | (toBeDisplayed ? WindowManagerGlobal.RELAYOUT_RES_FIRST_TIME : 0)
                | (surfaceChanged ? WindowManagerGlobal.RELAYOUT_RES_SURFACE_CHANGED : 0)
                | (animating ? WindowManagerGlobal.RELAYOUT_RES_ANIMATING : 0);
    }

    public void performDeferredDestroyWindow(Session session, IWindow client) {
        long origId = Binder.clearCallingIdentity();

        try {
            synchronized (mWindowMap) {
                WindowState win = windowForClientLocked(session, client, false);
                if (win == null) {
                    return;
                }
                win.mWinAnimator.destroyDeferredSurfaceLocked();
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    public boolean outOfMemoryWindow(Session session, IWindow client) {
        long origId = Binder.clearCallingIdentity();

        try {
            synchronized (mWindowMap) {
                WindowState win = windowForClientLocked(session, client, false);
                if (win == null) {
                    return false;
                }
                return reclaimSomeSurfaceMemoryLocked(win.mWinAnimator, "from-client", false);
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    public void finishDrawingWindow(Session session, IWindow client) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mWindowMap) {
                WindowState win = windowForClientLocked(session, client, false);
                if (win != null && win.mWinAnimator.finishDrawingLocked()) {
                    if ((win.mAttrs.flags & FLAG_SHOW_WALLPAPER) != 0) {
                        getDefaultDisplayContentLocked().pendingLayoutChanges |=
                                WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
                    }
                    final DisplayContent displayContent = win.getDisplayContent();
                    if (displayContent != null) {
                        displayContent.layoutNeeded = true;
                    }
                    requestTraversalLocked();
                }
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    private boolean applyAnimationLocked(AppWindowToken atoken,
            WindowManager.LayoutParams lp, int transit, boolean enter, boolean isVoiceInteraction) {
        // Only apply an animation if the display isn't frozen.  If it is
        // frozen, there is no reason to animate and it can cause strange
        // artifacts when we unfreeze the display if some different animation
        // is running.
        if (okToDisplay()) {
            DisplayInfo displayInfo = getDefaultDisplayInfoLocked();
            final int width = displayInfo.appWidth;
            final int height = displayInfo.appHeight;
            if (DEBUG_APP_TRANSITIONS || DEBUG_ANIM) Slog.v(TAG, "applyAnimation: atoken="
                    + atoken);

            // Determine the visible rect to calculate the thumbnail clip
            WindowState win = atoken.findMainWindow();
            Rect containingFrame = new Rect(0, 0, width, height);
            Rect contentInsets = new Rect();
            boolean isFullScreen = true;
            if (win != null) {
                if (win.mContainingFrame != null) {
                    containingFrame.set(win.mContainingFrame);
                }
                if (win.mContentInsets != null) {
                    contentInsets.set(win.mContentInsets);
                }
                isFullScreen =
                        ((win.mSystemUiVisibility & SYSTEM_UI_FLAGS_LAYOUT_STABLE_FULLSCREEN) ==
                                SYSTEM_UI_FLAGS_LAYOUT_STABLE_FULLSCREEN);
            }

            if (atoken.mLaunchTaskBehind) {
                // Differentiate the two animations. This one which is briefly on the screen
                // gets the !enter animation, and the other activity which remains on the
                // screen gets the enter animation. Both appear in the mOpeningApps set.
                enter = false;
            }
            Animation a = mAppTransition.loadAnimation(lp, transit, enter, width, height,
                    mCurConfiguration.orientation, containingFrame, contentInsets, isFullScreen,
                    isVoiceInteraction);
            if (a != null) {
                if (DEBUG_ANIM) {
                    RuntimeException e = null;
                    if (!HIDE_STACK_CRAWLS) {
                        e = new RuntimeException();
                        e.fillInStackTrace();
                    }
                    Slog.v(TAG, "Loaded animation " + a + " for " + atoken, e);
                }
                atoken.mAppAnimator.setAnimation(a, width, height);
            }
        } else {
            atoken.mAppAnimator.clearAnimation();
        }

        return atoken.mAppAnimator.animation != null;
    }

    // -------------------------------------------------------------
    // Application Window Tokens
    // -------------------------------------------------------------

    public void validateAppTokens(int stackId, List<TaskGroup> tasks) {
        synchronized (mWindowMap) {
            int t = tasks.size() - 1;
            if (t < 0) {
                Slog.w(TAG, "validateAppTokens: empty task list");
                return;
            }

            TaskGroup task = tasks.get(0);
            int taskId = task.taskId;
            Task targetTask = mTaskIdToTask.get(taskId);
            DisplayContent displayContent = targetTask.getDisplayContent();
            if (displayContent == null) {
                Slog.w(TAG, "validateAppTokens: no Display for taskId=" + taskId);
                return;
            }

            final ArrayList<Task> localTasks = mStackIdToStack.get(stackId).getTasks();
            int taskNdx;
            for (taskNdx = localTasks.size() - 1; taskNdx >= 0 && t >= 0; --taskNdx, --t) {
                AppTokenList localTokens = localTasks.get(taskNdx).mAppTokens;
                task = tasks.get(t);
                List<IApplicationToken> tokens = task.tokens;

                DisplayContent lastDisplayContent = displayContent;
                displayContent = mTaskIdToTask.get(taskId).getDisplayContent();
                if (displayContent != lastDisplayContent) {
                    Slog.w(TAG, "validateAppTokens: displayContent changed in TaskGroup list!");
                    return;
                }

                int tokenNdx;
                int v;
                for (tokenNdx = localTokens.size() - 1, v = task.tokens.size() - 1;
                        tokenNdx >= 0 && v >= 0; ) {
                    final AppWindowToken atoken = localTokens.get(tokenNdx);
                    if (atoken.removed) {
                        --tokenNdx;
                        continue;
                    }
                    if (tokens.get(v) != atoken.token) {
                        break;
                    }
                    --tokenNdx;
                    v--;
                }

                if (tokenNdx >= 0 || v >= 0) {
                    break;
                }
            }

            if (taskNdx >= 0 || t >= 0) {
                Slog.w(TAG, "validateAppTokens: Mismatch! ActivityManager=" + tasks);
                Slog.w(TAG, "validateAppTokens: Mismatch! WindowManager=" + localTasks);
                Slog.w(TAG, "validateAppTokens: Mismatch! Callers=" + Debug.getCallers(4));
            }
        }
    }

    public void validateStackOrder(Integer[] remoteStackIds) {
        // TODO:
    }

    boolean checkCallingPermission(String permission, String func) {
        // Quick check: if the calling permission is me, it's all okay.
        if (Binder.getCallingPid() == Process.myPid()) {
            return true;
        }

        if (mContext.checkCallingPermission(permission)
                == PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        String msg = "Permission Denial: " + func + " from pid="
                + Binder.getCallingPid()
                + ", uid=" + Binder.getCallingUid()
                + " requires " + permission;
        Slog.w(TAG, msg);
        return false;
    }

    boolean okToDisplay() {
        return !mDisplayFrozen && mDisplayEnabled && mPolicy.isScreenOnFully();
    }

    AppWindowToken findAppWindowToken(IBinder token) {
        WindowToken wtoken = mTokenMap.get(token);
        if (wtoken == null) {
            return null;
        }
        return wtoken.appWindowToken;
    }

    @Override
    public void addWindowToken(IBinder token, int type) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "addWindowToken()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized(mWindowMap) {
            WindowToken wtoken = mTokenMap.get(token);
            if (wtoken != null) {
                Slog.w(TAG, "Attempted to add existing input method token: " + token);
                return;
            }
            wtoken = new WindowToken(this, token, type, true);
            mTokenMap.put(token, wtoken);
            if (type == TYPE_WALLPAPER) {
                mWallpaperTokens.add(wtoken);
            }
        }
    }

    @Override
    public void removeWindowToken(IBinder token) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "removeWindowToken()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        final long origId = Binder.clearCallingIdentity();
        synchronized(mWindowMap) {
            DisplayContent displayContent = null;
            WindowToken wtoken = mTokenMap.remove(token);
            if (wtoken != null) {
                boolean delayed = false;
                if (!wtoken.hidden) {
                    final int N = wtoken.windows.size();
                    boolean changed = false;

                    for (int i=0; i<N; i++) {
                        WindowState win = wtoken.windows.get(i);
                        displayContent = win.getDisplayContent();

                        if (win.mWinAnimator.isAnimating()) {
                            delayed = true;
                        }

                        if (win.isVisibleNow()) {
                            win.mWinAnimator.applyAnimationLocked(WindowManagerPolicy.TRANSIT_EXIT,
                                    false);
                            //TODO (multidisplay): Magnification is supported only for the default
                            if (mAccessibilityController != null && win.isDefaultDisplay()) {
                                mAccessibilityController.onWindowTransitionLocked(win,
                                        WindowManagerPolicy.TRANSIT_EXIT);
                            }
                            changed = true;
                            if (displayContent != null) {
                                displayContent.layoutNeeded = true;
                            }
                        }
                    }

                    wtoken.hidden = true;

                    if (changed) {
                        performLayoutAndPlaceSurfacesLocked();
                        updateFocusedWindowLocked(UPDATE_FOCUS_NORMAL,
                                false /*updateInputWindows*/);
                    }

                    if (delayed) {
                        if (displayContent != null) {
                            displayContent.mExitingTokens.add(wtoken);
                        }
                    } else if (wtoken.windowType == TYPE_WALLPAPER) {
                        mWallpaperTokens.remove(wtoken);
                    }
                }

                mInputMonitor.updateInputWindowsLw(true /*force*/);
            } else {
                Slog.w(TAG, "Attempted to remove non-existing token: " + token);
            }
        }
        Binder.restoreCallingIdentity(origId);
    }

    private Task createTask(int taskId, int stackId, int userId, AppWindowToken atoken) {
        if (DEBUG_STACK) Slog.i(TAG, "createTask: taskId=" + taskId + " stackId=" + stackId
                + " atoken=" + atoken);
        final TaskStack stack = mStackIdToStack.get(stackId);
        if (stack == null) {
            throw new IllegalArgumentException("addAppToken: invalid stackId=" + stackId);
        }
        EventLog.writeEvent(EventLogTags.WM_TASK_CREATED, taskId, stackId);
        Task task = new Task(atoken, stack, userId);
        mTaskIdToTask.put(taskId, task);
        stack.addTask(task, !atoken.mLaunchTaskBehind /* toTop */);
        return task;
    }

    @Override
    public void addAppToken(int addPos, IApplicationToken token, int taskId, int stackId,
            int requestedOrientation, boolean fullscreen, boolean showWhenLocked, int userId,
            int configChanges, boolean voiceInteraction, boolean launchTaskBehind) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "addAppToken()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        // Get the dispatching timeout here while we are not holding any locks so that it
        // can be cached by the AppWindowToken.  The timeout value is used later by the
        // input dispatcher in code that does hold locks.  If we did not cache the value
        // here we would run the chance of introducing a deadlock between the window manager
        // (which holds locks while updating the input dispatcher state) and the activity manager
        // (which holds locks while querying the application token).
        long inputDispatchingTimeoutNanos;
        try {
            inputDispatchingTimeoutNanos = token.getKeyDispatchingTimeout() * 1000000L;
        } catch (RemoteException ex) {
            Slog.w(TAG, "Could not get dispatching timeout.", ex);
            inputDispatchingTimeoutNanos = DEFAULT_INPUT_DISPATCHING_TIMEOUT_NANOS;
        }

        synchronized(mWindowMap) {
            AppWindowToken atoken = findAppWindowToken(token.asBinder());
            if (atoken != null) {
                Slog.w(TAG, "Attempted to add existing app token: " + token);
                return;
            }
            atoken = new AppWindowToken(this, token, voiceInteraction);
            atoken.inputDispatchingTimeoutNanos = inputDispatchingTimeoutNanos;
            atoken.groupId = taskId;
            atoken.appFullscreen = fullscreen;
            atoken.showWhenLocked = showWhenLocked;
            atoken.requestedOrientation = requestedOrientation;
            atoken.layoutConfigChanges = (configChanges &
                    (ActivityInfo.CONFIG_SCREEN_SIZE | ActivityInfo.CONFIG_ORIENTATION)) != 0;
            atoken.mLaunchTaskBehind = launchTaskBehind;
            if (DEBUG_TOKEN_MOVEMENT || DEBUG_ADD_REMOVE) Slog.v(TAG, "addAppToken: " + atoken
                    + " to stack=" + stackId + " task=" + taskId + " at " + addPos);

            Task task = mTaskIdToTask.get(taskId);
            if (task == null) {
                createTask(taskId, stackId, userId, atoken);
            } else {
                task.addAppToken(addPos, atoken);
            }

            mTokenMap.put(token.asBinder(), atoken);

            // Application tokens start out hidden.
            atoken.hidden = true;
            atoken.hiddenRequested = true;

            //dump();
        }
    }

    @Override
    public void setAppGroupId(IBinder token, int groupId) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "setAppGroupId()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized(mWindowMap) {
            final AppWindowToken atoken = findAppWindowToken(token);
            if (atoken == null) {
                Slog.w(TAG, "Attempted to set group id of non-existing app token: " + token);
                return;
            }
            final Task oldTask = mTaskIdToTask.get(atoken.groupId);
            oldTask.removeAppToken(atoken);

            atoken.groupId = groupId;
            Task newTask = mTaskIdToTask.get(groupId);
            if (newTask == null) {
                newTask = createTask(groupId, oldTask.mStack.mStackId, oldTask.mUserId, atoken);
            } else {
                newTask.mAppTokens.add(atoken);
            }
        }
    }

    public int getOrientationFromWindowsLocked() {
        if (mDisplayFrozen || mOpeningApps.size() > 0 || mClosingApps.size() > 0) {
            // If the display is frozen, some activities may be in the middle
            // of restarting, and thus have removed their old window.  If the
            // window has the flag to hide the lock screen, then the lock screen
            // can re-appear and inflict its own orientation on us.  Keep the
            // orientation stable until this all settles down.
            return mLastWindowForcedOrientation;
        }

        // TODO(multidisplay): Change to the correct display.
        final WindowList windows = getDefaultWindowListLocked();
        int pos = windows.size() - 1;
        while (pos >= 0) {
            WindowState win = windows.get(pos);
            pos--;
            if (win.mAppToken != null) {
                // We hit an application window. so the orientation will be determined by the
                // app window. No point in continuing further.
                return (mLastWindowForcedOrientation=ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
            }
            if (!win.isVisibleLw() || !win.mPolicyVisibilityAfterAnim) {
                continue;
            }
            int req = win.mAttrs.screenOrientation;
            if((req == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED) ||
                    (req == ActivityInfo.SCREEN_ORIENTATION_BEHIND)){
                continue;
            }

            if (DEBUG_ORIENTATION) Slog.v(TAG, win + " forcing orientation to " + req);
            return (mLastWindowForcedOrientation=req);
        }
        return (mLastWindowForcedOrientation=ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
    }

    public int getOrientationFromAppTokensLocked() {
        int lastOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
        boolean findingBehind = false;
        boolean lastFullscreen = false;
        // TODO: Multi window.
        DisplayContent displayContent = getDefaultDisplayContentLocked();
        final ArrayList<Task> tasks = displayContent.getTasks();
        for (int taskNdx = tasks.size() - 1; taskNdx >= 0; --taskNdx) {
            AppTokenList tokens = tasks.get(taskNdx).mAppTokens;
            final int firstToken = tokens.size() - 1;
            for (int tokenNdx = firstToken; tokenNdx >= 0; --tokenNdx) {
                final AppWindowToken atoken = tokens.get(tokenNdx);

                if (DEBUG_APP_ORIENTATION) Slog.v(TAG, "Checking app orientation: " + atoken);

                // if we're about to tear down this window and not seek for
                // the behind activity, don't use it for orientation
                if (!findingBehind
                        && (!atoken.hidden && atoken.hiddenRequested)) {
                    if (DEBUG_ORIENTATION) Slog.v(TAG, "Skipping " + atoken
                            + " -- going to hide");
                    continue;
                }

                if (tokenNdx == firstToken) {
                    // If we have hit a new Task, and the bottom
                    // of the previous group didn't explicitly say to use
                    // the orientation behind it, and the last app was
                    // full screen, then we'll stick with the
                    // user's orientation.
                    if (lastOrientation != ActivityInfo.SCREEN_ORIENTATION_BEHIND
                            && lastFullscreen) {
                        if (DEBUG_ORIENTATION) Slog.v(TAG, "Done at " + atoken
                                + " -- end of group, return " + lastOrientation);
                        return lastOrientation;
                    }
                }

                // We ignore any hidden applications on the top.
                if (atoken.hiddenRequested || atoken.willBeHidden) {
                    if (DEBUG_ORIENTATION) Slog.v(TAG, "Skipping " + atoken
                            + " -- hidden on top");
                    continue;
                }

                if (tokenNdx == 0) {
                    // Last token in this task.
                    lastOrientation = atoken.requestedOrientation;
                }

                int or = atoken.requestedOrientation;
                // If this application is fullscreen, and didn't explicitly say
                // to use the orientation behind it, then just take whatever
                // orientation it has and ignores whatever is under it.
                lastFullscreen = atoken.appFullscreen;
                if (lastFullscreen
                        && or != ActivityInfo.SCREEN_ORIENTATION_BEHIND) {
                    if (DEBUG_ORIENTATION) Slog.v(TAG, "Done at " + atoken
                            + " -- full screen, return " + or);
                    return or;
                }
                // If this application has requested an explicit orientation,
                // then use it.
                if (or != ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED
                        && or != ActivityInfo.SCREEN_ORIENTATION_BEHIND) {
                    if (DEBUG_ORIENTATION) Slog.v(TAG, "Done at " + atoken
                            + " -- explicitly set, return " + or);
                    return or;
                }
                findingBehind |= (or == ActivityInfo.SCREEN_ORIENTATION_BEHIND);
            }
        }
        if (DEBUG_ORIENTATION) Slog.v(TAG, "No app is requesting an orientation");
        return ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
    }

    @Override
    public Configuration updateOrientationFromAppTokens(
            Configuration currentConfig, IBinder freezeThisOneIfNeeded) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "updateOrientationFromAppTokens()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        Configuration config = null;
        long ident = Binder.clearCallingIdentity();

        synchronized(mWindowMap) {
            config = updateOrientationFromAppTokensLocked(currentConfig,
                    freezeThisOneIfNeeded);
        }

        Binder.restoreCallingIdentity(ident);
        return config;
    }

    private Configuration updateOrientationFromAppTokensLocked(
            Configuration currentConfig, IBinder freezeThisOneIfNeeded) {
        Configuration config = null;

        if (updateOrientationFromAppTokensLocked(false)) {
            if (freezeThisOneIfNeeded != null) {
                AppWindowToken atoken = findAppWindowToken(freezeThisOneIfNeeded);
                if (atoken != null) {
                    startAppFreezingScreenLocked(atoken);
                }
            }
            config = computeNewConfigurationLocked();

        } else if (currentConfig != null) {
            // No obvious action we need to take, but if our current
            // state mismatches the activity manager's, update it,
            // disregarding font scale, which should remain set to
            // the value of the previous configuration.
            mTempConfiguration.setToDefaults();
            mTempConfiguration.fontScale = currentConfig.fontScale;
            if (computeScreenConfigurationLocked(mTempConfiguration)) {
                if (currentConfig.diff(mTempConfiguration) != 0) {
                    mWaitingForConfig = true;
                    final DisplayContent displayContent = getDefaultDisplayContentLocked();
                    displayContent.layoutNeeded = true;
                    int anim[] = new int[2];
                    if (displayContent.isDimming()) {
                        anim[0] = anim[1] = 0;
                    } else {
                        mPolicy.selectRotationAnimationLw(anim);
                    }
                    startFreezingDisplayLocked(false, anim[0], anim[1]);
                    config = new Configuration(mTempConfiguration);
                }
            }
        }

        return config;
    }

    /*
     * Determine the new desired orientation of the display, returning
     * a non-null new Configuration if it has changed from the current
     * orientation.  IF TRUE IS RETURNED SOMEONE MUST CALL
     * setNewConfiguration() TO TELL THE WINDOW MANAGER IT CAN UNFREEZE THE
     * SCREEN.  This will typically be done for you if you call
     * sendNewConfiguration().
     *
     * The orientation is computed from non-application windows first. If none of
     * the non-application windows specify orientation, the orientation is computed from
     * application tokens.
     * @see android.view.IWindowManager#updateOrientationFromAppTokens(
     * android.os.IBinder)
     */
    boolean updateOrientationFromAppTokensLocked(boolean inTransaction) {
        long ident = Binder.clearCallingIdentity();
        try {
            int req = getOrientationFromWindowsLocked();
            if (req == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED) {
                req = getOrientationFromAppTokensLocked();
            }

            if (req != mForcedAppOrientation) {
                mForcedAppOrientation = req;
                //send a message to Policy indicating orientation change to take
                //action like disabling/enabling sensors etc.,
                mPolicy.setCurrentOrientationLw(req);
                if (updateRotationUncheckedLocked(inTransaction)) {
                    // changed
                    return true;
                }
            }

            return false;
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void setNewConfiguration(Configuration config) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "setNewConfiguration()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized(mWindowMap) {
            mCurConfiguration = new Configuration(config);
            if (mWaitingForConfig) {
                mWaitingForConfig = false;
                mLastFinishedFreezeSource = "new-config";
            }
            performLayoutAndPlaceSurfacesLocked();
        }
    }

    @Override
    public void setAppOrientation(IApplicationToken token, int requestedOrientation) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "setAppOrientation()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized(mWindowMap) {
            AppWindowToken atoken = findAppWindowToken(token.asBinder());
            if (atoken == null) {
                Slog.w(TAG, "Attempted to set orientation of non-existing app token: " + token);
                return;
            }

            atoken.requestedOrientation = requestedOrientation;
        }
    }

    @Override
    public int getAppOrientation(IApplicationToken token) {
        synchronized(mWindowMap) {
            AppWindowToken wtoken = findAppWindowToken(token.asBinder());
            if (wtoken == null) {
                return ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
            }

            return wtoken.requestedOrientation;
        }
    }

    /** Call while in a Surface transaction. */
    void setFocusedStackLayer() {
        mFocusedStackLayer = 0;
        if (mFocusedApp != null) {
            final WindowList windows = mFocusedApp.allAppWindows;
            for (int i = windows.size() - 1; i >= 0; --i) {
                final WindowState win = windows.get(i);
                final int animLayer = win.mWinAnimator.mAnimLayer;
                if (win.mAttachedWindow == null && win.isVisibleLw() &&
                        animLayer > mFocusedStackLayer) {
                    mFocusedStackLayer = animLayer + LAYER_OFFSET_FOCUSED_STACK;
                }
            }
        }
        if (DEBUG_LAYERS) Slog.v(TAG, "Setting FocusedStackFrame to layer=" +
                mFocusedStackLayer);
        mFocusedStackFrame.setLayer(mFocusedStackLayer);
    }

    void setFocusedStackFrame() {
        final TaskStack stack;
        if (mFocusedApp != null) {
            Task task = mTaskIdToTask.get(mFocusedApp.groupId);
            stack = task.mStack;
            final DisplayContent displayContent = task.getDisplayContent();
            if (displayContent != null) {
                displayContent.setTouchExcludeRegion(stack);
            }
        } else {
            stack = null;
        }
        if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG, ">>> OPEN TRANSACTION setFocusedStackFrame");
        SurfaceControl.openTransaction();
        try {
            if (stack == null) {
                mFocusedStackFrame.setVisibility(false);
            } else {
                mFocusedStackFrame.setBounds(stack);
                final boolean multipleStacks = !stack.isFullscreen();
                mFocusedStackFrame.setVisibility(multipleStacks);
            }
        } finally {
            SurfaceControl.closeTransaction();
            if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG, ">>> CLOSE TRANSACTION setFocusedStackFrame");
        }
    }

    @Override
    public void setFocusedApp(IBinder token, boolean moveFocusNow) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "setFocusedApp()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized(mWindowMap) {
            final AppWindowToken newFocus;
            if (token == null) {
                if (DEBUG_FOCUS_LIGHT) Slog.v(TAG, "Clearing focused app, was " + mFocusedApp);
                newFocus = null;
            } else {
                newFocus = findAppWindowToken(token);
                if (newFocus == null) {
                    Slog.w(TAG, "Attempted to set focus to non-existing app token: " + token);
                }
                if (DEBUG_FOCUS_LIGHT) Slog.v(TAG, "Set focused app to: " + newFocus
                        + " old focus=" + mFocusedApp + " moveFocusNow=" + moveFocusNow);
            }

            final boolean changed = mFocusedApp != newFocus;
            if (changed) {
                mFocusedApp = newFocus;
                mInputMonitor.setFocusedAppLw(newFocus);
            }

            if (moveFocusNow && changed) {
                final long origId = Binder.clearCallingIdentity();
                updateFocusedWindowLocked(UPDATE_FOCUS_NORMAL, true /*updateInputWindows*/);
                Binder.restoreCallingIdentity(origId);
            }
        }
    }

    @Override
    public void prepareAppTransition(int transit, boolean alwaysKeepCurrent) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "prepareAppTransition()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized(mWindowMap) {
            if (DEBUG_APP_TRANSITIONS) Slog.v(
                    TAG, "Prepare app transition: transit=" + transit
                    + " " + mAppTransition
                    + " alwaysKeepCurrent=" + alwaysKeepCurrent
                    + " Callers=" + Debug.getCallers(3));
            if (!mAppTransition.isTransitionSet() || mAppTransition.isTransitionNone()) {
                mAppTransition.setAppTransition(transit);
            } else if (!alwaysKeepCurrent) {
                if (transit == AppTransition.TRANSIT_TASK_OPEN
                        && mAppTransition.isTransitionEqual(
                                AppTransition.TRANSIT_TASK_CLOSE)) {
                    // Opening a new task always supersedes a close for the anim.
                    mAppTransition.setAppTransition(transit);
                } else if (transit == AppTransition.TRANSIT_ACTIVITY_OPEN
                        && mAppTransition.isTransitionEqual(
                            AppTransition.TRANSIT_ACTIVITY_CLOSE)) {
                    // Opening a new activity always supersedes a close for the anim.
                    mAppTransition.setAppTransition(transit);
                }
            }
            if (okToDisplay()) {
                mAppTransition.prepare();
                mStartingIconInTransition = false;
                mSkipAppTransitionAnimation = false;
                mH.removeMessages(H.APP_TRANSITION_TIMEOUT);
                mH.sendEmptyMessageDelayed(H.APP_TRANSITION_TIMEOUT, 5000);
            }
        }
    }

    @Override
    public int getPendingAppTransition() {
        return mAppTransition.getAppTransition();
    }

    @Override
    public void overridePendingAppTransition(String packageName,
            int enterAnim, int exitAnim, IRemoteCallback startedCallback) {
        synchronized(mWindowMap) {
            mAppTransition.overridePendingAppTransition(packageName, enterAnim, exitAnim,
                    startedCallback);
        }
    }

    @Override
    public void overridePendingAppTransitionScaleUp(int startX, int startY, int startWidth,
            int startHeight) {
        synchronized(mWindowMap) {
            mAppTransition.overridePendingAppTransitionScaleUp(startX, startY, startWidth,
                    startHeight);
        }
    }

    @Override
    public void overridePendingAppTransitionThumb(Bitmap srcThumb, int startX,
            int startY, IRemoteCallback startedCallback, boolean scaleUp) {
        synchronized(mWindowMap) {
            mAppTransition.overridePendingAppTransitionThumb(srcThumb, startX, startY,
                    startedCallback, scaleUp);
        }
    }

    @Override
    public void overridePendingAppTransitionAspectScaledThumb(Bitmap srcThumb, int startX,
            int startY, IRemoteCallback startedCallback, boolean scaleUp) {
        synchronized(mWindowMap) {
            mAppTransition.overridePendingAppTransitionAspectScaledThumb(srcThumb, startX,
                    startY, startedCallback, scaleUp);
        }
    }

    @Override
    public void executeAppTransition() {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "executeAppTransition()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized(mWindowMap) {
            if (DEBUG_APP_TRANSITIONS) Slog.w(TAG, "Execute app transition: " + mAppTransition,
                    new RuntimeException("here").fillInStackTrace());
            if (mAppTransition.isTransitionSet()) {
                mAppTransition.setReady();
                final long origId = Binder.clearCallingIdentity();
                try {
                    performLayoutAndPlaceSurfacesLocked();
                } finally {
                    Binder.restoreCallingIdentity(origId);
                }
            }
        }
    }

    @Override
    public void setAppStartingWindow(IBinder token, String pkg,
            int theme, CompatibilityInfo compatInfo,
            CharSequence nonLocalizedLabel, int labelRes, int icon, int logo,
            int windowFlags, IBinder transferFrom, boolean createIfNeeded) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "setAppStartingWindow()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized(mWindowMap) {
            if (DEBUG_STARTING_WINDOW) Slog.v(
                    TAG, "setAppStartingWindow: token=" + token + " pkg=" + pkg
                    + " transferFrom=" + transferFrom);

            AppWindowToken wtoken = findAppWindowToken(token);
            if (wtoken == null) {
                Slog.w(TAG, "Attempted to set icon of non-existing app token: " + token);
                return;
            }

            // If the display is frozen, we won't do anything until the
            // actual window is displayed so there is no reason to put in
            // the starting window.
            if (!okToDisplay()) {
                return;
            }

            if (wtoken.startingData != null) {
                return;
            }

            if (transferFrom != null) {
                AppWindowToken ttoken = findAppWindowToken(transferFrom);
                if (ttoken != null) {
                    WindowState startingWindow = ttoken.startingWindow;
                    if (startingWindow != null) {
                        if (mStartingIconInTransition) {
                            // In this case, the starting icon has already
                            // been displayed, so start letting windows get
                            // shown immediately without any more transitions.
                            mSkipAppTransitionAnimation = true;
                        }
                        if (DEBUG_STARTING_WINDOW) Slog.v(TAG,
                                "Moving existing starting " + startingWindow + " from " + ttoken
                                + " to " + wtoken);
                        final long origId = Binder.clearCallingIdentity();

                        // Transfer the starting window over to the new
                        // token.
                        wtoken.startingData = ttoken.startingData;
                        wtoken.startingView = ttoken.startingView;
                        wtoken.startingDisplayed = ttoken.startingDisplayed;
                        ttoken.startingDisplayed = false;
                        wtoken.startingWindow = startingWindow;
                        wtoken.reportedVisible = ttoken.reportedVisible;
                        ttoken.startingData = null;
                        ttoken.startingView = null;
                        ttoken.startingWindow = null;
                        ttoken.startingMoved = true;
                        startingWindow.mToken = wtoken;
                        startingWindow.mRootToken = wtoken;
                        startingWindow.mAppToken = wtoken;
                        startingWindow.mWinAnimator.mAppAnimator = wtoken.mAppAnimator;

                        if (DEBUG_WINDOW_MOVEMENT || DEBUG_ADD_REMOVE || DEBUG_STARTING_WINDOW) {
                            Slog.v(TAG, "Removing starting window: " + startingWindow);
                        }
                        startingWindow.getWindowList().remove(startingWindow);
                        mWindowsChanged = true;
                        if (DEBUG_ADD_REMOVE) Slog.v(TAG,
                                "Removing starting " + startingWindow + " from " + ttoken);
                        ttoken.windows.remove(startingWindow);
                        ttoken.allAppWindows.remove(startingWindow);
                        addWindowToListInOrderLocked(startingWindow, true);

                        // Propagate other interesting state between the
                        // tokens.  If the old token is displayed, we should
                        // immediately force the new one to be displayed.  If
                        // it is animating, we need to move that animation to
                        // the new one.
                        if (ttoken.allDrawn) {
                            wtoken.allDrawn = true;
                            wtoken.deferClearAllDrawn = ttoken.deferClearAllDrawn;
                        }
                        if (ttoken.firstWindowDrawn) {
                            wtoken.firstWindowDrawn = true;
                        }
                        if (!ttoken.hidden) {
                            wtoken.hidden = false;
                            wtoken.hiddenRequested = false;
                            wtoken.willBeHidden = false;
                        }
                        if (wtoken.clientHidden != ttoken.clientHidden) {
                            wtoken.clientHidden = ttoken.clientHidden;
                            wtoken.sendAppVisibilityToClients();
                        }
                        final AppWindowAnimator tAppAnimator = ttoken.mAppAnimator;
                        final AppWindowAnimator wAppAnimator = wtoken.mAppAnimator;
                        if (tAppAnimator.animation != null) {
                            wAppAnimator.animation = tAppAnimator.animation;
                            wAppAnimator.animating = tAppAnimator.animating;
                            wAppAnimator.animLayerAdjustment = tAppAnimator.animLayerAdjustment;
                            tAppAnimator.animation = null;
                            tAppAnimator.animLayerAdjustment = 0;
                            wAppAnimator.updateLayers();
                            tAppAnimator.updateLayers();
                        }

                        updateFocusedWindowLocked(UPDATE_FOCUS_WILL_PLACE_SURFACES,
                                true /*updateInputWindows*/);
                        getDefaultDisplayContentLocked().layoutNeeded = true;
                        performLayoutAndPlaceSurfacesLocked();
                        Binder.restoreCallingIdentity(origId);
                        return;
                    } else if (ttoken.startingData != null) {
                        // The previous app was getting ready to show a
                        // starting window, but hasn't yet done so.  Steal it!
                        if (DEBUG_STARTING_WINDOW) Slog.v(TAG,
                                "Moving pending starting from " + ttoken
                                + " to " + wtoken);
                        wtoken.startingData = ttoken.startingData;
                        ttoken.startingData = null;
                        ttoken.startingMoved = true;
                        Message m = mH.obtainMessage(H.ADD_STARTING, wtoken);
                        // Note: we really want to do sendMessageAtFrontOfQueue() because we
                        // want to process the message ASAP, before any other queued
                        // messages.
                        mH.sendMessageAtFrontOfQueue(m);
                        return;
                    }
                    final AppWindowAnimator tAppAnimator = ttoken.mAppAnimator;
                    final AppWindowAnimator wAppAnimator = wtoken.mAppAnimator;
                    if (tAppAnimator.thumbnail != null) {
                        // The old token is animating with a thumbnail, transfer
                        // that to the new token.
                        if (wAppAnimator.thumbnail != null) {
                            wAppAnimator.thumbnail.destroy();
                        }
                        wAppAnimator.thumbnail = tAppAnimator.thumbnail;
                        wAppAnimator.thumbnailX = tAppAnimator.thumbnailX;
                        wAppAnimator.thumbnailY = tAppAnimator.thumbnailY;
                        wAppAnimator.thumbnailLayer = tAppAnimator.thumbnailLayer;
                        wAppAnimator.thumbnailAnimation = tAppAnimator.thumbnailAnimation;
                        tAppAnimator.thumbnail = null;
                    }
                }
            }

            // There is no existing starting window, and the caller doesn't
            // want us to create one, so that's it!
            if (!createIfNeeded) {
                return;
            }

            // If this is a translucent window, then don't
            // show a starting window -- the current effect (a full-screen
            // opaque starting window that fades away to the real contents
            // when it is ready) does not work for this.
            if (DEBUG_STARTING_WINDOW) Slog.v(TAG, "Checking theme of starting window: 0x"
                    + Integer.toHexString(theme));
            if (theme != 0) {
                AttributeCache.Entry ent = AttributeCache.instance().get(pkg, theme,
                        com.android.internal.R.styleable.Window, mCurrentUserId);
                if (ent == null) {
                    // Whoops!  App doesn't exist.  Um.  Okay.  We'll just
                    // pretend like we didn't see that.
                    return;
                }
                if (DEBUG_STARTING_WINDOW) Slog.v(TAG, "Translucent="
                        + ent.array.getBoolean(
                                com.android.internal.R.styleable.Window_windowIsTranslucent, false)
                        + " Floating="
                        + ent.array.getBoolean(
                                com.android.internal.R.styleable.Window_windowIsFloating, false)
                        + " ShowWallpaper="
                        + ent.array.getBoolean(
                                com.android.internal.R.styleable.Window_windowShowWallpaper, false));
                if (ent.array.getBoolean(
                        com.android.internal.R.styleable.Window_windowIsTranslucent, false)) {
                    return;
                }
                if (ent.array.getBoolean(
                        com.android.internal.R.styleable.Window_windowIsFloating, false)) {
                    return;
                }
                if (ent.array.getBoolean(
                        com.android.internal.R.styleable.Window_windowShowWallpaper, false)) {
                    if (mWallpaperTarget == null) {
                        // If this theme is requesting a wallpaper, and the wallpaper
                        // is not curently visible, then this effectively serves as
                        // an opaque window and our starting window transition animation
                        // can still work.  We just need to make sure the starting window
                        // is also showing the wallpaper.
                        windowFlags |= FLAG_SHOW_WALLPAPER;
                    } else {
                        return;
                    }
                }
            }

            if (DEBUG_STARTING_WINDOW) Slog.v(TAG, "Creating StartingData");
            mStartingIconInTransition = true;
            wtoken.startingData = new StartingData(pkg, theme, compatInfo, nonLocalizedLabel,
                    labelRes, icon, logo, windowFlags);
            Message m = mH.obtainMessage(H.ADD_STARTING, wtoken);
            // Note: we really want to do sendMessageAtFrontOfQueue() because we
            // want to process the message ASAP, before any other queued
            // messages.
            if (DEBUG_STARTING_WINDOW) Slog.v(TAG, "Enqueueing ADD_STARTING");
            mH.sendMessageAtFrontOfQueue(m);
        }
    }

    public void removeAppStartingWindow(IBinder token) {
        synchronized (mWindowMap) {
            AppWindowToken wtoken = mTokenMap.get(token).appWindowToken;
            if (wtoken.startingWindow != null) {
                scheduleRemoveStartingWindow(wtoken);
            }
        }
    }

    @Override
    public void setAppWillBeHidden(IBinder token) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "setAppWillBeHidden()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        AppWindowToken wtoken;

        synchronized(mWindowMap) {
            wtoken = findAppWindowToken(token);
            if (wtoken == null) {
                Slog.w(TAG, "Attempted to set will be hidden of non-existing app token: " + token);
                return;
            }
            wtoken.willBeHidden = true;
        }
    }

    public void setAppFullscreen(IBinder token, boolean toOpaque) {
        AppWindowToken atoken = findAppWindowToken(token);
        if (atoken != null) {
            atoken.appFullscreen = toOpaque;
            setWindowOpaque(token, toOpaque);
            requestTraversal();
        }
    }

    public void setWindowOpaque(IBinder token, boolean isOpaque) {
        AppWindowToken wtoken = findAppWindowToken(token);
        if (wtoken != null) {
            WindowState win = wtoken.findMainWindow();
            if (win != null) {
                win.mWinAnimator.setOpaque(isOpaque);
            }
        }
    }

    boolean setTokenVisibilityLocked(AppWindowToken wtoken, WindowManager.LayoutParams lp,
            boolean visible, int transit, boolean performLayout, boolean isVoiceInteraction) {
        boolean delayed = false;

        if (wtoken.clientHidden == visible) {
            wtoken.clientHidden = !visible;
            wtoken.sendAppVisibilityToClients();
        }

        wtoken.willBeHidden = false;
        if (wtoken.hidden == visible) {
            boolean changed = false;
            if (DEBUG_APP_TRANSITIONS) Slog.v(
                TAG, "Changing app " + wtoken + " hidden=" + wtoken.hidden
                + " performLayout=" + performLayout);

            boolean runningAppAnimation = false;

            if (transit != AppTransition.TRANSIT_UNSET) {
                if (wtoken.mAppAnimator.animation == AppWindowAnimator.sDummyAnimation) {
                    wtoken.mAppAnimator.animation = null;
                }
                if (applyAnimationLocked(wtoken, lp, transit, visible, isVoiceInteraction)) {
                    delayed = runningAppAnimation = true;
                }
                WindowState window = wtoken.findMainWindow();
                //TODO (multidisplay): Magnification is supported only for the default display.
                if (window != null && mAccessibilityController != null
                        && window.getDisplayId() == Display.DEFAULT_DISPLAY) {
                    mAccessibilityController.onAppWindowTransitionLocked(window, transit);
                }
                changed = true;
            }

            final int N = wtoken.allAppWindows.size();
            for (int i=0; i<N; i++) {
                WindowState win = wtoken.allAppWindows.get(i);
                if (win == wtoken.startingWindow) {
                    continue;
                }

                //Slog.i(TAG, "Window " + win + ": vis=" + win.isVisible());
                //win.dump("  ");
                if (visible) {
                    if (!win.isVisibleNow()) {
                        if (!runningAppAnimation) {
                            win.mWinAnimator.applyAnimationLocked(
                                    WindowManagerPolicy.TRANSIT_ENTER, true);
                            //TODO (multidisplay): Magnification is supported only for the default
                            if (mAccessibilityController != null
                                    && win.getDisplayId() == Display.DEFAULT_DISPLAY) {
                                mAccessibilityController.onWindowTransitionLocked(win,
                                        WindowManagerPolicy.TRANSIT_ENTER);
                            }
                        }
                        changed = true;
                        final DisplayContent displayContent = win.getDisplayContent();
                        if (displayContent != null) {
                            displayContent.layoutNeeded = true;
                        }
                    }
                } else if (win.isVisibleNow()) {
                    if (!runningAppAnimation) {
                        win.mWinAnimator.applyAnimationLocked(
                                WindowManagerPolicy.TRANSIT_EXIT, false);
                        //TODO (multidisplay): Magnification is supported only for the default
                        if (mAccessibilityController != null
                                && win.getDisplayId() == Display.DEFAULT_DISPLAY) {
                            mAccessibilityController.onWindowTransitionLocked(win,
                                    WindowManagerPolicy.TRANSIT_EXIT);
                        }
                    }
                    changed = true;
                    final DisplayContent displayContent = win.getDisplayContent();
                    if (displayContent != null) {
                        displayContent.layoutNeeded = true;
                    }
                }
            }

            wtoken.hidden = wtoken.hiddenRequested = !visible;
            if (!visible) {
                unsetAppFreezingScreenLocked(wtoken, true, true);
            } else {
                // If we are being set visible, and the starting window is
                // not yet displayed, then make sure it doesn't get displayed.
                WindowState swin = wtoken.startingWindow;
                if (swin != null && !swin.isDrawnLw()) {
                    swin.mPolicyVisibility = false;
                    swin.mPolicyVisibilityAfterAnim = false;
                 }
            }

            if (DEBUG_APP_TRANSITIONS) Slog.v(TAG, "setTokenVisibilityLocked: " + wtoken
                      + ": hidden=" + wtoken.hidden + " hiddenRequested="
                      + wtoken.hiddenRequested);

            if (changed) {
                mInputMonitor.setUpdateInputWindowsNeededLw();
                if (performLayout) {
                    updateFocusedWindowLocked(UPDATE_FOCUS_WILL_PLACE_SURFACES,
                            false /*updateInputWindows*/);
                    performLayoutAndPlaceSurfacesLocked();
                }
                mInputMonitor.updateInputWindowsLw(false /*force*/);
            }
        }

        if (wtoken.mAppAnimator.animation != null) {
            delayed = true;
        }

        for (int i = wtoken.allAppWindows.size() - 1; i >= 0 && !delayed; i--) {
            if (wtoken.allAppWindows.get(i).mWinAnimator.isWindowAnimating()) {
                delayed = true;
            }
        }

        return delayed;
    }

    @Override
    public void setAppVisibility(IBinder token, boolean visible) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "setAppVisibility()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        AppWindowToken wtoken;

        synchronized(mWindowMap) {
            wtoken = findAppWindowToken(token);
            if (wtoken == null) {
                Slog.w(TAG, "Attempted to set visibility of non-existing app token: " + token);
                return;
            }

            if (DEBUG_APP_TRANSITIONS || DEBUG_ORIENTATION) Slog.v(TAG, "setAppVisibility(" +
                    token + ", visible=" + visible + "): " + mAppTransition +
                    " hidden=" + wtoken.hidden + " hiddenRequested=" +
                    wtoken.hiddenRequested, HIDE_STACK_CRAWLS ?
                            null : new RuntimeException("here").fillInStackTrace());

            // If we are preparing an app transition, then delay changing
            // the visibility of this token until we execute that transition.
            if (okToDisplay() && mAppTransition.isTransitionSet()) {
                wtoken.hiddenRequested = !visible;

                if (!wtoken.startingDisplayed) {
                    if (DEBUG_APP_TRANSITIONS) Slog.v(
                            TAG, "Setting dummy animation on: " + wtoken);
                    wtoken.mAppAnimator.setDummyAnimation();
                }
                mOpeningApps.remove(wtoken);
                mClosingApps.remove(wtoken);
                wtoken.waitingToShow = wtoken.waitingToHide = false;
                wtoken.inPendingTransaction = true;
                if (visible) {
                    mOpeningApps.add(wtoken);
                    wtoken.startingMoved = false;
                    wtoken.mEnteringAnimation = true;

                    // If the token is currently hidden (should be the
                    // common case), then we need to set up to wait for
                    // its windows to be ready.
                    if (wtoken.hidden) {
                        wtoken.allDrawn = false;
                        wtoken.deferClearAllDrawn = false;
                        wtoken.waitingToShow = true;

                        if (wtoken.clientHidden) {
                            // In the case where we are making an app visible
                            // but holding off for a transition, we still need
                            // to tell the client to make its windows visible so
                            // they get drawn.  Otherwise, we will wait on
                            // performing the transition until all windows have
                            // been drawn, they never will be, and we are sad.
                            wtoken.clientHidden = false;
                            wtoken.sendAppVisibilityToClients();
                        }
                    }
                } else {
                    mClosingApps.add(wtoken);
                    wtoken.mEnteringAnimation = false;

                    // If the token is currently visible (should be the
                    // common case), then set up to wait for it to be hidden.
                    if (!wtoken.hidden) {
                        wtoken.waitingToHide = true;
                    }
                }
                if (mAppTransition.getAppTransition() == AppTransition.TRANSIT_TASK_OPEN_BEHIND) {
                    // We're launchingBehind, add the launching activity to mOpeningApps.
                    final WindowState win =
                            findFocusedWindowLocked(getDefaultDisplayContentLocked());
                    if (win != null) {
                        final AppWindowToken focusedToken = win.mAppToken;
                        if (focusedToken != null) {
                            if (DEBUG_APP_TRANSITIONS) Slog.d(TAG, "TRANSIT_TASK_OPEN_BEHIND, " +
                                    " adding " + focusedToken + " to mOpeningApps");
                            // Force animation to be loaded.
                            focusedToken.hidden = true;
                            mOpeningApps.add(focusedToken);
                        }
                    }
                }
                return;
            }

            final long origId = Binder.clearCallingIdentity();
            setTokenVisibilityLocked(wtoken, null, visible, AppTransition.TRANSIT_UNSET,
                    true, wtoken.voiceInteraction);
            wtoken.updateReportedVisibilityLocked();
            Binder.restoreCallingIdentity(origId);
        }
    }

    void unsetAppFreezingScreenLocked(AppWindowToken wtoken,
            boolean unfreezeSurfaceNow, boolean force) {
        if (wtoken.mAppAnimator.freezingScreen) {
            if (DEBUG_ORIENTATION) Slog.v(TAG, "Clear freezing of " + wtoken
                    + " force=" + force);
            final int N = wtoken.allAppWindows.size();
            boolean unfrozeWindows = false;
            for (int i=0; i<N; i++) {
                WindowState w = wtoken.allAppWindows.get(i);
                if (w.mAppFreezing) {
                    w.mAppFreezing = false;
                    if (w.mHasSurface && !w.mOrientationChanging) {
                        if (DEBUG_ORIENTATION) Slog.v(TAG, "set mOrientationChanging of " + w);
                        w.mOrientationChanging = true;
                        mInnerFields.mOrientationChangeComplete = false;
                    }
                    w.mLastFreezeDuration = 0;
                    unfrozeWindows = true;
                    final DisplayContent displayContent = w.getDisplayContent();
                    if (displayContent != null) {
                        displayContent.layoutNeeded = true;
                    }
                }
            }
            if (force || unfrozeWindows) {
                if (DEBUG_ORIENTATION) Slog.v(TAG, "No longer freezing: " + wtoken);
                wtoken.mAppAnimator.freezingScreen = false;
                wtoken.mAppAnimator.lastFreezeDuration = (int)(SystemClock.elapsedRealtime()
                        - mDisplayFreezeTime);
                mAppsFreezingScreen--;
                mLastFinishedFreezeSource = wtoken;
            }
            if (unfreezeSurfaceNow) {
                if (unfrozeWindows) {
                    performLayoutAndPlaceSurfacesLocked();
                }
                stopFreezingDisplayLocked();
            }
        }
    }

    private void startAppFreezingScreenLocked(AppWindowToken wtoken) {
        if (DEBUG_ORIENTATION) {
            RuntimeException e = null;
            if (!HIDE_STACK_CRAWLS) {
                e = new RuntimeException();
                e.fillInStackTrace();
            }
            Slog.i(TAG, "Set freezing of " + wtoken.appToken
                    + ": hidden=" + wtoken.hidden + " freezing="
                    + wtoken.mAppAnimator.freezingScreen, e);
        }
        if (!wtoken.hiddenRequested) {
            if (!wtoken.mAppAnimator.freezingScreen) {
                wtoken.mAppAnimator.freezingScreen = true;
                wtoken.mAppAnimator.lastFreezeDuration = 0;
                mAppsFreezingScreen++;
                if (mAppsFreezingScreen == 1) {
                    startFreezingDisplayLocked(false, 0, 0);
                    mH.removeMessages(H.APP_FREEZE_TIMEOUT);
                    mH.sendEmptyMessageDelayed(H.APP_FREEZE_TIMEOUT, 5000);
                }
            }
            final int N = wtoken.allAppWindows.size();
            for (int i=0; i<N; i++) {
                WindowState w = wtoken.allAppWindows.get(i);
                w.mAppFreezing = true;
            }
        }
    }

    @Override
    public void startAppFreezingScreen(IBinder token, int configChanges) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "setAppFreezingScreen()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized(mWindowMap) {
            if (configChanges == 0 && okToDisplay()) {
                if (DEBUG_ORIENTATION) Slog.v(TAG, "Skipping set freeze of " + token);
                return;
            }

            AppWindowToken wtoken = findAppWindowToken(token);
            if (wtoken == null || wtoken.appToken == null) {
                Slog.w(TAG, "Attempted to freeze screen with non-existing app token: " + wtoken);
                return;
            }
            final long origId = Binder.clearCallingIdentity();
            startAppFreezingScreenLocked(wtoken);
            Binder.restoreCallingIdentity(origId);
        }
    }

    @Override
    public void stopAppFreezingScreen(IBinder token, boolean force) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "setAppFreezingScreen()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized(mWindowMap) {
            AppWindowToken wtoken = findAppWindowToken(token);
            if (wtoken == null || wtoken.appToken == null) {
                return;
            }
            final long origId = Binder.clearCallingIdentity();
            if (DEBUG_ORIENTATION) Slog.v(TAG, "Clear freezing of " + token
                    + ": hidden=" + wtoken.hidden + " freezing=" + wtoken.mAppAnimator.freezingScreen);
            unsetAppFreezingScreenLocked(wtoken, true, force);
            Binder.restoreCallingIdentity(origId);
        }
    }

    void removeAppFromTaskLocked(AppWindowToken wtoken) {
        wtoken.removeAllWindows();

        final Task task = mTaskIdToTask.get(wtoken.groupId);
        if (task != null) {
            if (!task.removeAppToken(wtoken)) {
                Slog.e(TAG, "removeAppFromTaskLocked: token=" + wtoken + " not found.");
            }
        }
    }

    @Override
    public void removeAppToken(IBinder token) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "removeAppToken()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        AppWindowToken wtoken = null;
        AppWindowToken startingToken = null;
        boolean delayed = false;

        final long origId = Binder.clearCallingIdentity();
        synchronized(mWindowMap) {
            WindowToken basewtoken = mTokenMap.remove(token);
            if (basewtoken != null && (wtoken=basewtoken.appWindowToken) != null) {
                if (DEBUG_APP_TRANSITIONS) Slog.v(TAG, "Removing app token: " + wtoken);
                delayed = setTokenVisibilityLocked(wtoken, null, false,
                        AppTransition.TRANSIT_UNSET, true, wtoken.voiceInteraction);
                wtoken.inPendingTransaction = false;
                mOpeningApps.remove(wtoken);
                wtoken.waitingToShow = false;
                if (mClosingApps.contains(wtoken)) {
                    delayed = true;
                } else if (mAppTransition.isTransitionSet()) {
                    mClosingApps.add(wtoken);
                    wtoken.waitingToHide = true;
                    delayed = true;
                }
                if (DEBUG_APP_TRANSITIONS) Slog.v(
                        TAG, "Removing app " + wtoken + " delayed=" + delayed
                        + " animation=" + wtoken.mAppAnimator.animation
                        + " animating=" + wtoken.mAppAnimator.animating);
                if (DEBUG_ADD_REMOVE || DEBUG_TOKEN_MOVEMENT) Slog.v(TAG, "removeAppToken: "
                        + wtoken + " delayed=" + delayed + " Callers=" + Debug.getCallers(4));
                final TaskStack stack = mTaskIdToTask.get(wtoken.groupId).mStack;
                if (delayed) {
                    // set the token aside because it has an active animation to be finished
                    if (DEBUG_ADD_REMOVE || DEBUG_TOKEN_MOVEMENT) Slog.v(TAG,
                            "removeAppToken make exiting: " + wtoken);
                    stack.mExitingAppTokens.add(wtoken);
                    wtoken.mDeferRemoval = true;
                } else {
                    // Make sure there is no animation running on this token,
                    // so any windows associated with it will be removed as
                    // soon as their animations are complete
                    wtoken.mAppAnimator.clearAnimation();
                    wtoken.mAppAnimator.animating = false;
                    removeAppFromTaskLocked(wtoken);
                }

                wtoken.removed = true;
                if (wtoken.startingData != null) {
                    startingToken = wtoken;
                }
                unsetAppFreezingScreenLocked(wtoken, true, true);
                if (mFocusedApp == wtoken) {
                    if (DEBUG_FOCUS_LIGHT) Slog.v(TAG, "Removing focused app token:" + wtoken);
                    mFocusedApp = null;
                    updateFocusedWindowLocked(UPDATE_FOCUS_NORMAL, true /*updateInputWindows*/);
                    mInputMonitor.setFocusedAppLw(null);
                }
            } else {
                Slog.w(TAG, "Attempted to remove non-existing app token: " + token);
            }

            if (!delayed && wtoken != null) {
                wtoken.updateReportedVisibilityLocked();
            }
        }
        Binder.restoreCallingIdentity(origId);

        // Will only remove if startingToken non null.
        scheduleRemoveStartingWindow(startingToken);
    }

    void scheduleRemoveStartingWindow(AppWindowToken wtoken) {
        if (wtoken != null && wtoken.startingWindow != null) {
            if (DEBUG_STARTING_WINDOW) Slog.v(TAG, Debug.getCallers(1) +
                    ": Schedule remove starting " + wtoken + (wtoken != null ?
                    " startingWindow=" + wtoken.startingWindow : ""));
            Message m = mH.obtainMessage(H.REMOVE_STARTING, wtoken);
            mH.sendMessage(m);
        }
    }

    private boolean tmpRemoveAppWindowsLocked(WindowToken token) {
        WindowList windows = token.windows;
        final int NW = windows.size();
        if (NW > 0) {
            mWindowsChanged = true;
        }
        for (int i = 0; i < NW; i++) {
            WindowState win = windows.get(i);
            if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "Tmp removing app window " + win);
            win.getWindowList().remove(win);
            int j = win.mChildWindows.size();
            while (j > 0) {
                j--;
                WindowState cwin = win.mChildWindows.get(j);
                if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG,
                        "Tmp removing child window " + cwin);
                cwin.getWindowList().remove(cwin);
            }
        }
        return NW > 0;
    }

    void dumpAppTokensLocked() {
        final int numStacks = mStackIdToStack.size();
        for (int stackNdx = 0; stackNdx < numStacks; ++stackNdx) {
            final TaskStack stack = mStackIdToStack.valueAt(stackNdx);
            Slog.v(TAG, "  Stack #" + stack.mStackId + " tasks from bottom to top:");
            final ArrayList<Task> tasks = stack.getTasks();
            final int numTasks = tasks.size();
            for (int taskNdx = 0; taskNdx < numTasks; ++taskNdx) {
                final Task task = tasks.get(taskNdx);
                Slog.v(TAG, "    Task #" + task.taskId + " activities from bottom to top:");
                AppTokenList tokens = task.mAppTokens;
                final int numTokens = tokens.size();
                for (int tokenNdx = 0; tokenNdx < numTokens; ++tokenNdx) {
                    Slog.v(TAG, "      activity #" + tokenNdx + ": " + tokens.get(tokenNdx).token);
                }
            }
        }
    }

    void dumpWindowsLocked() {
        final int numDisplays = mDisplayContents.size();
        for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
            final DisplayContent displayContent = mDisplayContents.valueAt(displayNdx);
            Slog.v(TAG, " Display #" + displayContent.getDisplayId());
            final WindowList windows = displayContent.getWindowList();
            for (int winNdx = windows.size() - 1; winNdx >= 0; --winNdx) {
                Slog.v(TAG, "  #" + winNdx + ": " + windows.get(winNdx));
            }
        }
    }

    private int findAppWindowInsertionPointLocked(AppWindowToken target) {
        final int taskId = target.groupId;
        Task targetTask = mTaskIdToTask.get(taskId);
        if (targetTask == null) {
            Slog.w(TAG, "findAppWindowInsertionPointLocked: no Task for " + target + " taskId="
                    + taskId);
            return 0;
        }
        DisplayContent displayContent = targetTask.getDisplayContent();
        if (displayContent == null) {
            Slog.w(TAG, "findAppWindowInsertionPointLocked: no DisplayContent for " + target);
            return 0;
        }
        final WindowList windows = displayContent.getWindowList();
        final int NW = windows.size();

        boolean found = false;
        final ArrayList<Task> tasks = displayContent.getTasks();
        for (int taskNdx = tasks.size() - 1; taskNdx >= 0; --taskNdx) {
            final Task task = tasks.get(taskNdx);
            if (!found && task.taskId != taskId) {
                continue;
            }
            AppTokenList tokens = task.mAppTokens;
            for (int tokenNdx = tokens.size() - 1; tokenNdx >= 0; --tokenNdx) {
                final AppWindowToken wtoken = tokens.get(tokenNdx);
                if (!found && wtoken == target) {
                    found = true;
                }
                if (found) {
                    // Find the first app token below the new position that has
                    // a window displayed.
                    if (DEBUG_REORDER) Slog.v(TAG, "Looking for lower windows in " + wtoken.token);
                    if (wtoken.sendingToBottom) {
                        if (DEBUG_REORDER) Slog.v(TAG, "Skipping token -- currently sending to bottom");
                        continue;
                    }
                    for (int i = wtoken.windows.size() - 1; i >= 0; --i) {
                        WindowState win = wtoken.windows.get(i);
                        for (int j = win.mChildWindows.size() - 1; j >= 0; --j) {
                            WindowState cwin = win.mChildWindows.get(j);
                            if (cwin.mSubLayer >= 0) {
                                for (int pos = NW - 1; pos >= 0; pos--) {
                                    if (windows.get(pos) == cwin) {
                                        if (DEBUG_REORDER) Slog.v(TAG,
                                                "Found child win @" + (pos + 1));
                                        return pos + 1;
                                    }
                                }
                            }
                        }
                        for (int pos = NW - 1; pos >= 0; pos--) {
                            if (windows.get(pos) == win) {
                                if (DEBUG_REORDER) Slog.v(TAG, "Found win @" + (pos + 1));
                                return pos + 1;
                            }
                        }
                    }
                }
            }
        }
        // Never put an app window underneath wallpaper.
        for (int pos = NW - 1; pos >= 0; pos--) {
            if (windows.get(pos).mIsWallpaper) {
                if (DEBUG_REORDER) Slog.v(TAG, "Found wallpaper @" + pos);
                return pos + 1;
            }
        }
        return 0;
    }

    private final int reAddWindowLocked(int index, WindowState win) {
        final WindowList windows = win.getWindowList();
        final int NCW = win.mChildWindows.size();
        boolean added = false;
        for (int j=0; j<NCW; j++) {
            WindowState cwin = win.mChildWindows.get(j);
            if (!added && cwin.mSubLayer >= 0) {
                if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "Re-adding child window at "
                        + index + ": " + cwin);
                win.mRebuilding = false;
                windows.add(index, win);
                index++;
                added = true;
            }
            if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "Re-adding window at "
                    + index + ": " + cwin);
            cwin.mRebuilding = false;
            windows.add(index, cwin);
            index++;
        }
        if (!added) {
            if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "Re-adding window at "
                    + index + ": " + win);
            win.mRebuilding = false;
            windows.add(index, win);
            index++;
        }
        mWindowsChanged = true;
        return index;
    }

    private final int reAddAppWindowsLocked(final DisplayContent displayContent, int index,
                                            WindowToken token) {
        final int NW = token.windows.size();
        for (int i=0; i<NW; i++) {
            final WindowState win = token.windows.get(i);
            final DisplayContent winDisplayContent = win.getDisplayContent();
            if (winDisplayContent == displayContent || winDisplayContent == null) {
                win.mDisplayContent = displayContent;
                index = reAddWindowLocked(index, win);
            }
        }
        return index;
    }

    void tmpRemoveTaskWindowsLocked(Task task) {
        AppTokenList tokens = task.mAppTokens;
        for (int tokenNdx = tokens.size() - 1; tokenNdx >= 0; --tokenNdx) {
            tmpRemoveAppWindowsLocked(tokens.get(tokenNdx));
        }
    }

    void moveStackWindowsLocked(DisplayContent displayContent) {
        // First remove all of the windows from the list.
        final ArrayList<Task> tasks = displayContent.getTasks();
        final int numTasks = tasks.size();
        for (int taskNdx = 0; taskNdx < numTasks; ++taskNdx) {
            tmpRemoveTaskWindowsLocked(tasks.get(taskNdx));
        }

        // And now add them back at the correct place.
        // Where to start adding?
        for (int taskNdx = 0; taskNdx < numTasks; ++taskNdx) {
            AppTokenList tokens = tasks.get(taskNdx).mAppTokens;
            final int numTokens = tokens.size();
            if (numTokens == 0) {
                continue;
            }
            int pos = findAppWindowInsertionPointLocked(tokens.get(0));
            for (int tokenNdx = 0; tokenNdx < numTokens; ++tokenNdx) {
                final AppWindowToken wtoken = tokens.get(tokenNdx);
                if (wtoken != null) {
                    final int newPos = reAddAppWindowsLocked(displayContent, pos, wtoken);
                    if (newPos != pos) {
                        displayContent.layoutNeeded = true;
                    }
                    pos = newPos;
                }
            }
        }

        if (!updateFocusedWindowLocked(UPDATE_FOCUS_WILL_PLACE_SURFACES,
                false /*updateInputWindows*/)) {
            assignLayersLocked(displayContent.getWindowList());
        }

        mInputMonitor.setUpdateInputWindowsNeededLw();
        performLayoutAndPlaceSurfacesLocked();
        mInputMonitor.updateInputWindowsLw(false /*force*/);

        //dump();
    }

    public void moveTaskToTop(int taskId) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized(mWindowMap) {
                Task task = mTaskIdToTask.get(taskId);
                if (task == null) {
                    // Normal behavior, addAppToken will be called next and task will be created.
                    return;
                }
                final TaskStack stack = task.mStack;
                final DisplayContent displayContent = task.getDisplayContent();
                displayContent.moveStack(stack, true);
                if (displayContent.isDefaultDisplay) {
                    final TaskStack homeStack = displayContent.getHomeStack();
                    if (homeStack != stack) {
                        // When a non-home stack moves to the top, the home stack moves to the
                        // bottom.
                        displayContent.moveStack(homeStack, false);
                    }
                }
                stack.moveTaskToTop(task);
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    public void moveTaskToBottom(int taskId) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized(mWindowMap) {
                Task task = mTaskIdToTask.get(taskId);
                if (task == null) {
                    Slog.e(TAG, "moveTaskToBottom: taskId=" + taskId
                            + " not found in mTaskIdToTask");
                    return;
                }
                final TaskStack stack = task.mStack;
                stack.moveTaskToBottom(task);
                moveStackWindowsLocked(stack.getDisplayContent());
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    /**
     * Create a new TaskStack and place it on a DisplayContent.
     * @param stackId The unique identifier of the new stack.
     * @param displayId The unique identifier of the DisplayContent.
     */
    public void attachStack(int stackId, int displayId) {
        final long origId = Binder.clearCallingIdentity();
        try {
            synchronized (mWindowMap) {
                final DisplayContent displayContent = mDisplayContents.get(displayId);
                if (displayContent != null) {
                    TaskStack stack = mStackIdToStack.get(stackId);
                    if (stack == null) {
                        if (DEBUG_STACK) Slog.d(TAG, "attachStack: stackId=" + stackId);
                        stack = new TaskStack(this, stackId);
                        mStackIdToStack.put(stackId, stack);
                    }
                    stack.attachDisplayContent(displayContent);
                    displayContent.attachStack(stack);
                    moveStackWindowsLocked(displayContent);
                    final WindowList windows = displayContent.getWindowList();
                    for (int winNdx = windows.size() - 1; winNdx >= 0; --winNdx) {
                        windows.get(winNdx).reportResized();
                    }
                }
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }
    }

    void detachStackLocked(DisplayContent displayContent, TaskStack stack) {
        displayContent.detachStack(stack);
        stack.detachDisplay();
    }

    public void detachStack(int stackId) {
        synchronized (mWindowMap) {
            TaskStack stack = mStackIdToStack.get(stackId);
            if (stack != null) {
                final DisplayContent displayContent = stack.getDisplayContent();
                if (displayContent != null) {
                    if (stack.isAnimating()) {
                        stack.mDeferDetach = true;
                        return;
                    }
                    detachStackLocked(displayContent, stack);
                }
            }
        }
    }

    public void removeStack(int stackId) {
        mStackIdToStack.remove(stackId);
    }

    void removeTaskLocked(Task task) {
        final int taskId = task.taskId;
        final TaskStack stack = task.mStack;
        if (stack.isAnimating()) {
            if (DEBUG_STACK) Slog.i(TAG, "removeTask: deferring removing taskId=" + taskId);
            task.mDeferRemoval = true;
            return;
        }
        if (DEBUG_STACK) Slog.i(TAG, "removeTask: removing taskId=" + taskId);
        EventLog.writeEvent(EventLogTags.WM_TASK_REMOVED, taskId, "removeTask");
        task.mDeferRemoval = false;
        task.mStack.removeTask(task);
        mTaskIdToTask.delete(task.taskId);
    }

    public void removeTask(int taskId) {
        synchronized (mWindowMap) {
            Task task = mTaskIdToTask.get(taskId);
            if (task == null) {
                if (DEBUG_STACK) Slog.i(TAG, "removeTask: could not find taskId=" + taskId);
                return;
            }
            removeTaskLocked(task);
        }
    }

    public void addTask(int taskId, int stackId, boolean toTop) {
        synchronized (mWindowMap) {
            if (DEBUG_STACK) Slog.i(TAG, "addTask: adding taskId=" + taskId
                    + " to " + (toTop ? "top" : "bottom"));
            Task task = mTaskIdToTask.get(taskId);
            if (task == null) {
                return;
            }
            TaskStack stack = mStackIdToStack.get(stackId);
            stack.addTask(task, toTop);
            final DisplayContent displayContent = stack.getDisplayContent();
            displayContent.layoutNeeded = true;
            performLayoutAndPlaceSurfacesLocked();
        }
    }

    public void resizeStack(int stackId, Rect bounds) {
        synchronized (mWindowMap) {
            final TaskStack stack = mStackIdToStack.get(stackId);
            if (stack == null) {
                throw new IllegalArgumentException("resizeStack: stackId " + stackId
                        + " not found.");
            }
            if (stack.setBounds(bounds)) {
                stack.resizeWindows();
                stack.getDisplayContent().layoutNeeded = true;
                performLayoutAndPlaceSurfacesLocked();
            }
        }
    }

    public void getStackBounds(int stackId, Rect bounds) {
        final TaskStack stack = mStackIdToStack.get(stackId);
        if (stack != null) {
            stack.getBounds(bounds);
            return;
        }
        bounds.setEmpty();
    }

    // -------------------------------------------------------------
    // Misc IWindowSession methods
    // -------------------------------------------------------------

    @Override
    public void startFreezingScreen(int exitAnim, int enterAnim) {
        if (!checkCallingPermission(android.Manifest.permission.FREEZE_SCREEN,
                "startFreezingScreen()")) {
            throw new SecurityException("Requires FREEZE_SCREEN permission");
        }

        synchronized(mWindowMap) {
            if (!mClientFreezingScreen) {
                mClientFreezingScreen = true;
                final long origId = Binder.clearCallingIdentity();
                try {
                    startFreezingDisplayLocked(false, exitAnim, enterAnim);
                    mH.removeMessages(H.CLIENT_FREEZE_TIMEOUT);
                    mH.sendEmptyMessageDelayed(H.CLIENT_FREEZE_TIMEOUT, 5000);
                } finally {
                    Binder.restoreCallingIdentity(origId);
                }
            }
        }
    }

    @Override
    public void stopFreezingScreen() {
        if (!checkCallingPermission(android.Manifest.permission.FREEZE_SCREEN,
                "stopFreezingScreen()")) {
            throw new SecurityException("Requires FREEZE_SCREEN permission");
        }

        synchronized(mWindowMap) {
            if (mClientFreezingScreen) {
                mClientFreezingScreen = false;
                mLastFinishedFreezeSource = "client";
                final long origId = Binder.clearCallingIdentity();
                try {
                    stopFreezingDisplayLocked();
                } finally {
                    Binder.restoreCallingIdentity(origId);
                }
            }
        }
    }

    @Override
    public void disableKeyguard(IBinder token, String tag) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DISABLE_KEYGUARD)
            != PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Requires DISABLE_KEYGUARD permission");
        }

        if (token == null) {
            throw new IllegalArgumentException("token == null");
        }

        mKeyguardDisableHandler.sendMessage(mKeyguardDisableHandler.obtainMessage(
                KeyguardDisableHandler.KEYGUARD_DISABLE, new Pair<IBinder, String>(token, tag)));
    }

    @Override
    public void reenableKeyguard(IBinder token) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DISABLE_KEYGUARD)
            != PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Requires DISABLE_KEYGUARD permission");
        }

        if (token == null) {
            throw new IllegalArgumentException("token == null");
        }

        mKeyguardDisableHandler.sendMessage(mKeyguardDisableHandler.obtainMessage(
                KeyguardDisableHandler.KEYGUARD_REENABLE, token));
    }

    /**
     * @see android.app.KeyguardManager#exitKeyguardSecurely
     */
    @Override
    public void exitKeyguardSecurely(final IOnKeyguardExitResult callback) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DISABLE_KEYGUARD)
            != PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Requires DISABLE_KEYGUARD permission");
        }

        if (callback == null) {
            throw new IllegalArgumentException("callback == null");
        }

        mPolicy.exitKeyguardSecurely(new WindowManagerPolicy.OnKeyguardExitResult() {
            @Override
            public void onKeyguardExitResult(boolean success) {
                try {
                    callback.onKeyguardExitResult(success);
                } catch (RemoteException e) {
                    // Client has died, we don't care.
                }
            }
        });
    }

    @Override
    public boolean inKeyguardRestrictedInputMode() {
        return mPolicy.inKeyguardRestrictedKeyInputMode();
    }

    @Override
    public boolean isKeyguardLocked() {
        return mPolicy.isKeyguardLocked();
    }

    @Override
    public boolean isKeyguardSecure() {
        return mPolicy.isKeyguardSecure();
    }

    @Override
    public void dismissKeyguard() {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DISABLE_KEYGUARD)
                != PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Requires DISABLE_KEYGUARD permission");
        }
        synchronized(mWindowMap) {
            mPolicy.dismissKeyguardLw();
        }
    }

    @Override
    public void keyguardGoingAway(boolean disableWindowAnimations,
            boolean keyguardGoingToNotificationShade) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DISABLE_KEYGUARD)
                != PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Requires DISABLE_KEYGUARD permission");
        }
        synchronized (mWindowMap) {
            mAnimator.mKeyguardGoingAway = true;
            mAnimator.mKeyguardGoingAwayToNotificationShade = keyguardGoingToNotificationShade;
            mAnimator.mKeyguardGoingAwayDisableWindowAnimations = disableWindowAnimations;
            requestTraversalLocked();
        }
    }

    public void keyguardWaitingForActivityDrawn() {
        synchronized (mWindowMap) {
            mKeyguardWaitingForActivityDrawn = true;
        }
    }

    public void notifyActivityDrawnForKeyguard() {
        synchronized (mWindowMap) {
            if (mKeyguardWaitingForActivityDrawn) {
                mPolicy.notifyActivityDrawnForKeyguardLw();
                mKeyguardWaitingForActivityDrawn = false;
            }
        }
    }

    void showGlobalActions() {
        mPolicy.showGlobalActions();
    }

    @Override
    public void closeSystemDialogs(String reason) {
        synchronized(mWindowMap) {
            final int numDisplays = mDisplayContents.size();
            for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                final WindowList windows = mDisplayContents.valueAt(displayNdx).getWindowList();
                final int numWindows = windows.size();
                for (int winNdx = 0; winNdx < numWindows; ++winNdx) {
                    final WindowState w = windows.get(winNdx);
                    if (w.mHasSurface) {
                        try {
                            w.mClient.closeSystemDialogs(reason);
                        } catch (RemoteException e) {
                        }
                    }
                }
            }
        }
    }

    static float fixScale(float scale) {
        if (scale < 0) scale = 0;
        else if (scale > 20) scale = 20;
        return Math.abs(scale);
    }

    @Override
    public void setAnimationScale(int which, float scale) {
        if (!checkCallingPermission(android.Manifest.permission.SET_ANIMATION_SCALE,
                "setAnimationScale()")) {
            throw new SecurityException("Requires SET_ANIMATION_SCALE permission");
        }

        scale = fixScale(scale);
        switch (which) {
            case 0: mWindowAnimationScaleSetting = scale; break;
            case 1: mTransitionAnimationScaleSetting = scale; break;
            case 2: mAnimatorDurationScaleSetting = scale; break;
        }

        // Persist setting
        mH.sendEmptyMessage(H.PERSIST_ANIMATION_SCALE);
    }

    @Override
    public void setAnimationScales(float[] scales) {
        if (!checkCallingPermission(android.Manifest.permission.SET_ANIMATION_SCALE,
                "setAnimationScale()")) {
            throw new SecurityException("Requires SET_ANIMATION_SCALE permission");
        }

        if (scales != null) {
            if (scales.length >= 1) {
                mWindowAnimationScaleSetting = fixScale(scales[0]);
            }
            if (scales.length >= 2) {
                mTransitionAnimationScaleSetting = fixScale(scales[1]);
            }
            if (scales.length >= 3) {
                mAnimatorDurationScaleSetting = fixScale(scales[2]);
                dispatchNewAnimatorScaleLocked(null);
            }
        }

        // Persist setting
        mH.sendEmptyMessage(H.PERSIST_ANIMATION_SCALE);
    }

    private void setAnimatorDurationScale(float scale) {
        mAnimatorDurationScaleSetting = scale;
        ValueAnimator.setDurationScale(scale);
    }

    public float getWindowAnimationScaleLocked() {
        return mAnimationsDisabled ? 0 : mWindowAnimationScaleSetting;
    }

    public float getTransitionAnimationScaleLocked() {
        return mAnimationsDisabled ? 0 : mTransitionAnimationScaleSetting;
    }

    @Override
    public float getAnimationScale(int which) {
        switch (which) {
            case 0: return mWindowAnimationScaleSetting;
            case 1: return mTransitionAnimationScaleSetting;
            case 2: return mAnimatorDurationScaleSetting;
        }
        return 0;
    }

    @Override
    public float[] getAnimationScales() {
        return new float[] { mWindowAnimationScaleSetting, mTransitionAnimationScaleSetting,
                mAnimatorDurationScaleSetting };
    }

    @Override
    public float getCurrentAnimatorScale() {
        synchronized(mWindowMap) {
            return mAnimationsDisabled ? 0 : mAnimatorDurationScaleSetting;
        }
    }

    void dispatchNewAnimatorScaleLocked(Session session) {
        mH.obtainMessage(H.NEW_ANIMATOR_SCALE, session).sendToTarget();
    }

    @Override
    public void registerPointerEventListener(PointerEventListener listener) {
        mPointerEventDispatcher.registerInputEventListener(listener);
    }

    @Override
    public void unregisterPointerEventListener(PointerEventListener listener) {
        mPointerEventDispatcher.unregisterInputEventListener(listener);
    }

    // Called by window manager policy. Not exposed externally.
    @Override
    public int getLidState() {
        int sw = mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY,
                InputManagerService.SW_LID);
        if (sw > 0) {
            // Switch state: AKEY_STATE_DOWN or AKEY_STATE_VIRTUAL.
            return LID_CLOSED;
        } else if (sw == 0) {
            // Switch state: AKEY_STATE_UP.
            return LID_OPEN;
        } else {
            // Switch state: AKEY_STATE_UNKNOWN.
            return LID_ABSENT;
        }
    }

    // Called by window manager policy. Not exposed externally.
    @Override
    public int getCameraLensCoverState() {
        int sw = mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY,
                InputManagerService.SW_CAMERA_LENS_COVER);
        if (sw > 0) {
            // Switch state: AKEY_STATE_DOWN or AKEY_STATE_VIRTUAL.
            return CAMERA_LENS_COVERED;
        } else if (sw == 0) {
            // Switch state: AKEY_STATE_UP.
            return CAMERA_LENS_UNCOVERED;
        } else {
            // Switch state: AKEY_STATE_UNKNOWN.
            return CAMERA_LENS_COVER_ABSENT;
        }
    }

    // Called by window manager policy.  Not exposed externally.
    @Override
    public void switchKeyboardLayout(int deviceId, int direction) {
        mInputManager.switchKeyboardLayout(deviceId, direction);
    }

    // Called by window manager policy.  Not exposed externally.
    @Override
    public void shutdown(boolean confirm) {
        ShutdownThread.shutdown(mContext, confirm);
    }

    // Called by window manager policy.  Not exposed externally.
    @Override
    public void rebootSafeMode(boolean confirm) {
        ShutdownThread.rebootSafeMode(mContext, confirm);
    }

    public void setCurrentProfileIds(final int[] currentProfileIds) {
        synchronized (mWindowMap) {
            mCurrentProfileIds = currentProfileIds;
        }
    }

    public void setCurrentUser(final int newUserId, final int[] currentProfileIds) {
        synchronized (mWindowMap) {
            mCurrentUserId = newUserId;
            mCurrentProfileIds = currentProfileIds;
            mAppTransition.setCurrentUser(newUserId);
            mPolicy.setCurrentUserLw(newUserId);

            // Hide windows that should not be seen by the new user.
            final int numDisplays = mDisplayContents.size();
            for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                final DisplayContent displayContent = mDisplayContents.valueAt(displayNdx);
                displayContent.switchUserStacks(newUserId);
                rebuildAppWindowListLocked(displayContent);
            }
            performLayoutAndPlaceSurfacesLocked();
        }
    }

    /* Called by WindowState */
    boolean isCurrentProfileLocked(int userId) {
        if (userId == mCurrentUserId) return true;
        for (int i = 0; i < mCurrentProfileIds.length; i++) {
            if (mCurrentProfileIds[i] == userId) return true;
        }
        return false;
    }

    public void enableScreenAfterBoot() {
        synchronized(mWindowMap) {
            if (DEBUG_BOOT) {
                RuntimeException here = new RuntimeException("here");
                here.fillInStackTrace();
                Slog.i(TAG, "enableScreenAfterBoot: mDisplayEnabled=" + mDisplayEnabled
                        + " mForceDisplayEnabled=" + mForceDisplayEnabled
                        + " mShowingBootMessages=" + mShowingBootMessages
                        + " mSystemBooted=" + mSystemBooted, here);
            }
            if (mSystemBooted) {
                return;
            }
            mSystemBooted = true;
            hideBootMessagesLocked();
            // If the screen still doesn't come up after 30 seconds, give
            // up and turn it on.
            mH.sendEmptyMessageDelayed(H.BOOT_TIMEOUT, 30*1000);
        }

        mPolicy.systemBooted();

        performEnableScreen();
    }

    @Override
    public void enableScreenIfNeeded() {
        synchronized (mWindowMap) {
            enableScreenIfNeededLocked();
        }
    }

    void enableScreenIfNeededLocked() {
        if (DEBUG_BOOT) {
            RuntimeException here = new RuntimeException("here");
            here.fillInStackTrace();
            Slog.i(TAG, "enableScreenIfNeededLocked: mDisplayEnabled=" + mDisplayEnabled
                    + " mForceDisplayEnabled=" + mForceDisplayEnabled
                    + " mShowingBootMessages=" + mShowingBootMessages
                    + " mSystemBooted=" + mSystemBooted, here);
        }
        if (mDisplayEnabled) {
            return;
        }
        if (!mSystemBooted && !mShowingBootMessages) {
            return;
        }
        mH.sendEmptyMessage(H.ENABLE_SCREEN);
    }

    public void performBootTimeout() {
        synchronized(mWindowMap) {
            if (mDisplayEnabled) {
                return;
            }
            Slog.w(TAG, "***** BOOT TIMEOUT: forcing display enabled");
            mForceDisplayEnabled = true;
        }
        performEnableScreen();
    }

    public void performEnableScreen() {
        synchronized(mWindowMap) {
            if (DEBUG_BOOT) {
                RuntimeException here = new RuntimeException("here");
                here.fillInStackTrace();
                Slog.i(TAG, "performEnableScreen: mDisplayEnabled=" + mDisplayEnabled
                        + " mForceDisplayEnabled=" + mForceDisplayEnabled
                        + " mShowingBootMessages=" + mShowingBootMessages
                        + " mSystemBooted=" + mSystemBooted
                        + " mOnlyCore=" + mOnlyCore, here);
            }
            if (mDisplayEnabled) {
                return;
            }
            if (!mSystemBooted && !mShowingBootMessages) {
                return;
            }

            if (!mForceDisplayEnabled) {
                // Don't enable the screen until all existing windows
                // have been drawn.
                boolean haveBootMsg = false;
                boolean haveApp = false;
                // if the wallpaper service is disabled on the device, we're never going to have
                // wallpaper, don't bother waiting for it
                boolean haveWallpaper = false;
                boolean wallpaperEnabled = mContext.getResources().getBoolean(
                        com.android.internal.R.bool.config_enableWallpaperService)
                        && !mOnlyCore;
                boolean haveKeyguard = true;
                // TODO(multidisplay): Expand to all displays?
                final WindowList windows = getDefaultWindowListLocked();
                final int N = windows.size();
                for (int i=0; i<N; i++) {
                    WindowState w = windows.get(i);
                    if (w.isVisibleLw() && !w.mObscured && !w.isDrawnLw()) {
                        return;
                    }
                    if (w.isDrawnLw()) {
                        if (w.mAttrs.type == TYPE_BOOT_PROGRESS) {
                            haveBootMsg = true;
                        } else if (w.mAttrs.type == TYPE_APPLICATION) {
                            haveApp = true;
                        } else if (w.mAttrs.type == TYPE_WALLPAPER) {
                            haveWallpaper = true;
                        } else if (w.mAttrs.type == TYPE_STATUS_BAR) {
                            haveKeyguard = mPolicy.isKeyguardDrawnLw();
                        }
                    }
                }

                if (DEBUG_SCREEN_ON || DEBUG_BOOT) {
                    Slog.i(TAG, "******** booted=" + mSystemBooted + " msg=" + mShowingBootMessages
                            + " haveBoot=" + haveBootMsg + " haveApp=" + haveApp
                            + " haveWall=" + haveWallpaper + " wallEnabled=" + wallpaperEnabled
                            + " haveKeyguard=" + haveKeyguard);
                }

                // If we are turning on the screen to show the boot message,
                // don't do it until the boot message is actually displayed.
                if (!mSystemBooted && !haveBootMsg) {
                    return;
                }

                // If we are turning on the screen after the boot is completed
                // normally, don't do so until we have the application and
                // wallpaper.
                if (mSystemBooted && ((!haveApp && !haveKeyguard) ||
                        (wallpaperEnabled && !haveWallpaper))) {
                    return;
                }
            }

            mDisplayEnabled = true;
            if (DEBUG_SCREEN_ON || DEBUG_BOOT) Slog.i(TAG, "******************** ENABLING SCREEN!");
            if (false) {
                StringWriter sw = new StringWriter();
                PrintWriter pw = new FastPrintWriter(sw, false, 1024);
                this.dump(null, pw, null);
                pw.flush();
                Slog.i(TAG, sw.toString());
            }
            try {
                IBinder surfaceFlinger = ServiceManager.getService("SurfaceFlinger");
                if (surfaceFlinger != null) {
                    //Slog.i(TAG, "******* TELLING SURFACE FLINGER WE ARE BOOTED!");
                    Parcel data = Parcel.obtain();
                    data.writeInterfaceToken("android.ui.ISurfaceComposer");
                    surfaceFlinger.transact(IBinder.FIRST_CALL_TRANSACTION, // BOOT_FINISHED
                                            data, null, 0);
                    data.recycle();
                }
            } catch (RemoteException ex) {
                Slog.e(TAG, "Boot completed: SurfaceFlinger is dead!");
            }

            // Enable input dispatch.
            mInputMonitor.setEventDispatchingLw(mEventDispatchingEnabled);
        }

        mPolicy.enableScreenAfterBoot();

        // Make sure the last requested orientation has been applied.
        updateRotationUnchecked(false, false);
    }

    public void showBootMessage(final CharSequence msg, final boolean always) {
        boolean first = false;
        synchronized(mWindowMap) {
            if (DEBUG_BOOT) {
                RuntimeException here = new RuntimeException("here");
                here.fillInStackTrace();
                Slog.i(TAG, "showBootMessage: msg=" + msg + " always=" + always
                        + " mAllowBootMessages=" + mAllowBootMessages
                        + " mShowingBootMessages=" + mShowingBootMessages
                        + " mSystemBooted=" + mSystemBooted, here);
            }
            if (!mAllowBootMessages) {
                return;
            }
            if (!mShowingBootMessages) {
                if (!always) {
                    return;
                }
                first = true;
            }
            if (mSystemBooted) {
                return;
            }
            mShowingBootMessages = true;
            mPolicy.showBootMessage(msg, always);
        }
        if (first) {
            performEnableScreen();
        }
    }

    public void hideBootMessagesLocked() {
        if (DEBUG_BOOT) {
            RuntimeException here = new RuntimeException("here");
            here.fillInStackTrace();
            Slog.i(TAG, "hideBootMessagesLocked: mDisplayEnabled=" + mDisplayEnabled
                    + " mForceDisplayEnabled=" + mForceDisplayEnabled
                    + " mShowingBootMessages=" + mShowingBootMessages
                    + " mSystemBooted=" + mSystemBooted, here);
        }
        if (mShowingBootMessages) {
            mShowingBootMessages = false;
            mPolicy.hideBootMessages();
        }
    }

    @Override
    public void setInTouchMode(boolean mode) {
        synchronized(mWindowMap) {
            mInTouchMode = mode;
        }
    }

    public void showCircularDisplayMaskIfNeeded() {
        // we're fullscreen and not hosted in an ActivityView
        if (mContext.getResources().getBoolean(
                com.android.internal.R.bool.config_windowIsRound)
                && mContext.getResources().getBoolean(
                com.android.internal.R.bool.config_windowShowCircularMask)) {
            mH.sendMessage(mH.obtainMessage(H.SHOW_DISPLAY_MASK));
        }
    }

    public void showCircularMask() {
        synchronized(mWindowMap) {

            if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG,
                    ">>> OPEN TRANSACTION showDisplayMask");
            SurfaceControl.openTransaction();
            try {
                // TODO(multi-display): support multiple displays
                if (mCircularDisplayMask == null) {
                    int screenOffset = (int) mContext.getResources().getDimensionPixelSize(
                            com.android.internal.R.dimen.circular_display_mask_offset);

                    mCircularDisplayMask = new CircularDisplayMask(
                            getDefaultDisplayContentLocked().getDisplay(),
                            mFxSession,
                            mPolicy.windowTypeToLayerLw(
                                    WindowManager.LayoutParams.TYPE_POINTER)
                                    * TYPE_LAYER_MULTIPLIER + 10, screenOffset);
                }
                mCircularDisplayMask.setVisibility(true);
            } finally {
                SurfaceControl.closeTransaction();
                if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG,
                        "<<< CLOSE TRANSACTION showDisplayMask");
            }
        }
    }

    // TODO: more accounting of which pid(s) turned it on, keep count,
    // only allow disables from pids which have count on, etc.
    @Override
    public void showStrictModeViolation(boolean on) {
        int pid = Binder.getCallingPid();
        mH.sendMessage(mH.obtainMessage(H.SHOW_STRICT_MODE_VIOLATION, on ? 1 : 0, pid));
    }

    private void showStrictModeViolation(int arg, int pid) {
        final boolean on = arg != 0;
        synchronized(mWindowMap) {
            // Ignoring requests to enable the red border from clients
            // which aren't on screen.  (e.g. Broadcast Receivers in
            // the background..)
            if (on) {
                boolean isVisible = false;
                final int numDisplays = mDisplayContents.size();
                for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                    final WindowList windows = mDisplayContents.valueAt(displayNdx).getWindowList();
                    final int numWindows = windows.size();
                    for (int winNdx = 0; winNdx < numWindows; ++winNdx) {
                        final WindowState ws = windows.get(winNdx);
                        if (ws.mSession.mPid == pid && ws.isVisibleLw()) {
                            isVisible = true;
                            break;
                        }
                    }
                }
                if (!isVisible) {
                    return;
                }
            }

            if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG,
                    ">>> OPEN TRANSACTION showStrictModeViolation");
            SurfaceControl.openTransaction();
            try {
                // TODO(multi-display): support multiple displays
                if (mStrictModeFlash == null) {
                    mStrictModeFlash = new StrictModeFlash(
                            getDefaultDisplayContentLocked().getDisplay(), mFxSession);
                }
                mStrictModeFlash.setVisibility(on);
            } finally {
                SurfaceControl.closeTransaction();
                if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG,
                        "<<< CLOSE TRANSACTION showStrictModeViolation");
            }
        }
    }

    @Override
    public void setStrictModeVisualIndicatorPreference(String value) {
        SystemProperties.set(StrictMode.VISUAL_PROPERTY, value);
    }

    private static void convertCropForSurfaceFlinger(Rect crop, int rot, int dw, int dh) {
        if (rot == Surface.ROTATION_90) {
            final int tmp = crop.top;
            crop.top = dw - crop.right;
            crop.right = crop.bottom;
            crop.bottom = dw - crop.left;
            crop.left = tmp;
        } else if (rot == Surface.ROTATION_180) {
            int tmp = crop.top;
            crop.top = dh - crop.bottom;
            crop.bottom = dh - tmp;
            tmp = crop.right;
            crop.right = dw - crop.left;
            crop.left = dw - tmp;
        } else if (rot == Surface.ROTATION_270) {
            final int tmp = crop.top;
            crop.top = crop.left;
            crop.left = dh - crop.bottom;
            crop.bottom = crop.right;
            crop.right = dh - tmp;
        }
    }

    /**
     * Takes a snapshot of the screen.  In landscape mode this grabs the whole screen.
     * In portrait mode, it grabs the upper region of the screen based on the vertical dimension
     * of the target image.
     *
     * @param displayId the Display to take a screenshot of.
     * @param width the width of the target bitmap
     * @param height the height of the target bitmap
     * @param force565 if true the returned bitmap will be RGB_565, otherwise it
     *                 will be the same config as the surface
     */
    @Override
    public Bitmap screenshotApplications(IBinder appToken, int displayId, int width,
            int height, boolean force565) {
        if (!checkCallingPermission(android.Manifest.permission.READ_FRAME_BUFFER,
                "screenshotApplications()")) {
            throw new SecurityException("Requires READ_FRAME_BUFFER permission");
        }

        final DisplayContent displayContent = getDisplayContentLocked(displayId);
        if (displayContent == null) {
            if (DEBUG_SCREENSHOT) Slog.i(TAG, "Screenshot of " + appToken
                    + ": returning null. No Display for displayId=" + displayId);
            return null;
        }
        final DisplayInfo displayInfo = displayContent.getDisplayInfo();
        int dw = displayInfo.logicalWidth;
        int dh = displayInfo.logicalHeight;
        if (dw == 0 || dh == 0) {
            if (DEBUG_SCREENSHOT) Slog.i(TAG, "Screenshot of " + appToken
                    + ": returning null. logical widthxheight=" + dw + "x" + dh);
            return null;
        }

        Bitmap rawss = null;

        int maxLayer = 0;
        final Rect frame = new Rect();
        final Rect stackBounds = new Rect();

        float scale = 0;
        int rot = Surface.ROTATION_0;

        boolean screenshotReady;
        int minLayer;
        if (appToken == null) {
            screenshotReady = true;
            minLayer = 0;
        } else {
            screenshotReady = false;
            minLayer = Integer.MAX_VALUE;
        }

        int retryCount = 0;
        WindowState appWin = null;

        final boolean appIsImTarget = mInputMethodTarget != null
                && mInputMethodTarget.mAppToken != null
                && mInputMethodTarget.mAppToken.appToken != null
                && mInputMethodTarget.mAppToken.appToken.asBinder() == appToken;

        final int aboveAppLayer = (mPolicy.windowTypeToLayerLw(TYPE_APPLICATION) + 1)
                * TYPE_LAYER_MULTIPLIER + TYPE_LAYER_OFFSET;

        while (true) {
            if (retryCount++ > 0) {
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                }
            }
            synchronized(mWindowMap) {
                // Figure out the part of the screen that is actually the app.
                appWin = null;
                final WindowList windows = displayContent.getWindowList();
                for (int i = windows.size() - 1; i >= 0; i--) {
                    WindowState ws = windows.get(i);
                    if (!ws.mHasSurface) {
                        continue;
                    }
                    if (ws.mLayer >= aboveAppLayer) {
                        continue;
                    }
                    if (ws.mIsImWindow) {
                        if (!appIsImTarget) {
                            continue;
                        }
                    } else if (ws.mIsWallpaper) {
                        // Fall through.
                    } else if (appToken != null) {
                        if (ws.mAppToken == null || ws.mAppToken.token != appToken) {
                            // This app window is of no interest if it is not associated with the
                            // screenshot app.
                            continue;
                        }
                        appWin = ws;
                    }

                    // Include this window.

                    final WindowStateAnimator winAnim = ws.mWinAnimator;
                    if (maxLayer < winAnim.mSurfaceLayer) {
                        maxLayer = winAnim.mSurfaceLayer;
                    }
                    if (minLayer > winAnim.mSurfaceLayer) {
                        minLayer = winAnim.mSurfaceLayer;
                    }

                    // Don't include wallpaper in bounds calculation
                    if (!ws.mIsWallpaper) {
                        final Rect wf = ws.mFrame;
                        final Rect cr = ws.mContentInsets;
                        int left = wf.left + cr.left;
                        int top = wf.top + cr.top;
                        int right = wf.right - cr.right;
                        int bottom = wf.bottom - cr.bottom;
                        frame.union(left, top, right, bottom);
                        ws.getStackBounds(stackBounds);
                        frame.intersect(stackBounds);
                    }

                    if (ws.mAppToken != null && ws.mAppToken.token == appToken &&
                            ws.isDisplayedLw()) {
                        screenshotReady = true;
                    }
                }

                if (appToken != null && appWin == null) {
                    // Can't find a window to snapshot.
                    if (DEBUG_SCREENSHOT) Slog.i(TAG,
                            "Screenshot: Couldn't find a surface matching " + appToken);
                    return null;
                }

                if (!screenshotReady) {
                    if (retryCount > MAX_SCREENSHOT_RETRIES) {
                        Slog.i(TAG, "Screenshot max retries " + retryCount + " of " + appToken +
                                " appWin=" + (appWin == null ? "null" : (appWin + " drawState=" +
                                appWin.mWinAnimator.mDrawState)));
                        return null;
                    }

                    // Delay and hope that window gets drawn.
                    if (DEBUG_SCREENSHOT) Slog.i(TAG, "Screenshot: No image ready for " + appToken
                            + ", " + appWin + " drawState=" + appWin.mWinAnimator.mDrawState);
                    continue;
                }

                // Screenshot is ready to be taken. Everything from here below will continue
                // through the bottom of the loop and return a value. We only stay in the loop
                // because we don't want to release the mWindowMap lock until the screenshot is
                // taken.

                if (maxLayer == 0) {
                    if (DEBUG_SCREENSHOT) Slog.i(TAG, "Screenshot of " + appToken
                            + ": returning null maxLayer=" + maxLayer);
                    return null;
                }

                // Constrain frame to the screen size.
                frame.intersect(0, 0, dw, dh);

                // Tell surface flinger what part of the image to crop. Take the top
                // right part of the application, and crop the larger dimension to fit.
                Rect crop = new Rect(frame);
                if (width / (float) frame.width() < height / (float) frame.height()) {
                    int cropWidth = (int)((float)width / (float)height * frame.height());
                    crop.right = crop.left + cropWidth;
                } else {
                    int cropHeight = (int)((float)height / (float)width * frame.width());
                    crop.bottom = crop.top + cropHeight;
                }

                // The screenshot API does not apply the current screen rotation.
                rot = getDefaultDisplayContentLocked().getDisplay().getRotation();
                if (rot == Surface.ROTATION_90 || rot == Surface.ROTATION_270) {
                    final int tmp = width;
                    width = height;
                    height = tmp;
                    rot = (rot == Surface.ROTATION_90) ? Surface.ROTATION_270 : Surface.ROTATION_90;
                }

                // Surfaceflinger is not aware of orientation, so convert our logical
                // crop to surfaceflinger's portrait orientation.
                convertCropForSurfaceFlinger(crop, rot, dw, dh);

                if (DEBUG_SCREENSHOT) {
                    Slog.i(TAG, "Screenshot: " + dw + "x" + dh + " from " + minLayer + " to "
                            + maxLayer + " appToken=" + appToken);
                    for (int i = 0; i < windows.size(); i++) {
                        WindowState win = windows.get(i);
                        Slog.i(TAG, win + ": " + win.mLayer
                                + " animLayer=" + win.mWinAnimator.mAnimLayer
                                + " surfaceLayer=" + win.mWinAnimator.mSurfaceLayer);
                    }
                }

                ScreenRotationAnimation screenRotationAnimation =
                        mAnimator.getScreenRotationAnimationLocked(Display.DEFAULT_DISPLAY);
                final boolean inRotation = screenRotationAnimation != null &&
                        screenRotationAnimation.isAnimating();
                if (DEBUG_SCREENSHOT && inRotation) Slog.v(TAG,
                        "Taking screenshot while rotating");

                rawss = SurfaceControl.screenshot(crop, width, height, minLayer, maxLayer,
                        inRotation);
                if (rawss == null) {
                    Slog.w(TAG, "Screenshot failure taking screenshot for (" + dw + "x" + dh
                            + ") to layer " + maxLayer);
                    return null;
                }
            }

            break;
        }

        Bitmap bm = Bitmap.createBitmap(width, height, force565 ?
                Config.RGB_565 : rawss.getConfig());
        if (DEBUG_SCREENSHOT) {
            bm.eraseColor(0xFF000000);
        }
        Matrix matrix = new Matrix();
        ScreenRotationAnimation.createRotationMatrix(rot, width, height, matrix);
        Canvas canvas = new Canvas(bm);
        canvas.drawBitmap(rawss, matrix, null);
        canvas.setBitmap(null);

        if (DEBUG_SCREENSHOT) {
            // TEST IF IT's ALL BLACK
            int[] buffer = new int[bm.getWidth() * bm.getHeight()];
            bm.getPixels(buffer, 0, bm.getWidth(), 0, 0, bm.getWidth(), bm.getHeight());
            boolean allBlack = true;
            final int firstColor = buffer[0];
            for (int i = 0; i < buffer.length; i++) {
                if (buffer[i] != firstColor) {
                    allBlack = false;
                    break;
                }
            }
            if (allBlack) {
                Slog.i(TAG, "Screenshot " + appWin + " was monochrome(" +
                        Integer.toHexString(firstColor) + ")! mSurfaceLayer=" +
                        (appWin != null ? appWin.mWinAnimator.mSurfaceLayer : "null") +
                        " minLayer=" + minLayer + " maxLayer=" + maxLayer);
            }
        }

        rawss.recycle();

        return bm;
    }

    /**
     * Freeze rotation changes.  (Enable "rotation lock".)
     * Persists across reboots.
     * @param rotation The desired rotation to freeze to, or -1 to use the
     * current rotation.
     */
    @Override
    public void freezeRotation(int rotation) {
        if (!checkCallingPermission(android.Manifest.permission.SET_ORIENTATION,
                "freezeRotation()")) {
            throw new SecurityException("Requires SET_ORIENTATION permission");
        }
        if (rotation < -1 || rotation > Surface.ROTATION_270) {
            throw new IllegalArgumentException("Rotation argument must be -1 or a valid "
                    + "rotation constant.");
        }

        if (DEBUG_ORIENTATION) Slog.v(TAG, "freezeRotation: mRotation=" + mRotation);

        long origId = Binder.clearCallingIdentity();
        try {
            mPolicy.setUserRotationMode(WindowManagerPolicy.USER_ROTATION_LOCKED,
                    rotation == -1 ? mRotation : rotation);
        } finally {
            Binder.restoreCallingIdentity(origId);
        }

        updateRotationUnchecked(false, false);
    }

    /**
     * Thaw rotation changes.  (Disable "rotation lock".)
     * Persists across reboots.
     */
    @Override
    public void thawRotation() {
        if (!checkCallingPermission(android.Manifest.permission.SET_ORIENTATION,
                "thawRotation()")) {
            throw new SecurityException("Requires SET_ORIENTATION permission");
        }

        if (DEBUG_ORIENTATION) Slog.v(TAG, "thawRotation: mRotation=" + mRotation);

        long origId = Binder.clearCallingIdentity();
        try {
            mPolicy.setUserRotationMode(WindowManagerPolicy.USER_ROTATION_FREE,
                    777); // rot not used
        } finally {
            Binder.restoreCallingIdentity(origId);
        }

        updateRotationUnchecked(false, false);
    }

    /**
     * Recalculate the current rotation.
     *
     * Called by the window manager policy whenever the state of the system changes
     * such that the current rotation might need to be updated, such as when the
     * device is docked or rotated into a new posture.
     */
    @Override
    public void updateRotation(boolean alwaysSendConfiguration, boolean forceRelayout) {
        updateRotationUnchecked(alwaysSendConfiguration, forceRelayout);
    }

    /**
     * Temporarily pauses rotation changes until resumed.
     *
     * This can be used to prevent rotation changes from occurring while the user is
     * performing certain operations, such as drag and drop.
     *
     * This call nests and must be matched by an equal number of calls to
     * {@link #resumeRotationLocked}.
     */
    void pauseRotationLocked() {
        mDeferredRotationPauseCount += 1;
    }

    /**
     * Resumes normal rotation changes after being paused.
     */
    void resumeRotationLocked() {
        if (mDeferredRotationPauseCount > 0) {
            mDeferredRotationPauseCount -= 1;
            if (mDeferredRotationPauseCount == 0) {
                boolean changed = updateRotationUncheckedLocked(false);
                if (changed) {
                    mH.sendEmptyMessage(H.SEND_NEW_CONFIGURATION);
                }
            }
        }
    }

    public void updateRotationUnchecked(boolean alwaysSendConfiguration, boolean forceRelayout) {
        if(DEBUG_ORIENTATION) Slog.v(TAG, "updateRotationUnchecked("
                   + "alwaysSendConfiguration=" + alwaysSendConfiguration + ")");

        long origId = Binder.clearCallingIdentity();
        boolean changed;
        synchronized(mWindowMap) {
            changed = updateRotationUncheckedLocked(false);
            if (!changed || forceRelayout) {
                getDefaultDisplayContentLocked().layoutNeeded = true;
                performLayoutAndPlaceSurfacesLocked();
            }
        }

        if (changed || alwaysSendConfiguration) {
            sendNewConfiguration();
        }

        Binder.restoreCallingIdentity(origId);
    }

    // TODO(multidisplay): Rotate any display?
    /**
     * Updates the current rotation.
     *
     * Returns true if the rotation has been changed.  In this case YOU
     * MUST CALL sendNewConfiguration() TO UNFREEZE THE SCREEN.
     */
    public boolean updateRotationUncheckedLocked(boolean inTransaction) {
        if (mDeferredRotationPauseCount > 0) {
            // Rotation updates have been paused temporarily.  Defer the update until
            // updates have been resumed.
            if (DEBUG_ORIENTATION) Slog.v(TAG, "Deferring rotation, rotation is paused.");
            return false;
        }

        ScreenRotationAnimation screenRotationAnimation =
                mAnimator.getScreenRotationAnimationLocked(Display.DEFAULT_DISPLAY);
        if (screenRotationAnimation != null && screenRotationAnimation.isAnimating()) {
            // Rotation updates cannot be performed while the previous rotation change
            // animation is still in progress.  Skip this update.  We will try updating
            // again after the animation is finished and the display is unfrozen.
            if (DEBUG_ORIENTATION) Slog.v(TAG, "Deferring rotation, animation in progress.");
            return false;
        }

        if (!mDisplayEnabled) {
            // No point choosing a rotation if the display is not enabled.
            if (DEBUG_ORIENTATION) Slog.v(TAG, "Deferring rotation, display is not enabled.");
            return false;
        }

        // TODO: Implement forced rotation changes.
        //       Set mAltOrientation to indicate that the application is receiving
        //       an orientation that has different metrics than it expected.
        //       eg. Portrait instead of Landscape.

        int rotation = mPolicy.rotationForOrientationLw(mForcedAppOrientation, mRotation);
        boolean altOrientation = !mPolicy.rotationHasCompatibleMetricsLw(
                mForcedAppOrientation, rotation);

        if (DEBUG_ORIENTATION) {
            Slog.v(TAG, "Application requested orientation "
                    + mForcedAppOrientation + ", got rotation " + rotation
                    + " which has " + (altOrientation ? "incompatible" : "compatible")
                    + " metrics");
        }

        if (mRotation == rotation && mAltOrientation == altOrientation) {
            // No change.
            return false;
        }

        if (DEBUG_ORIENTATION) {
            Slog.v(TAG,
                "Rotation changed to " + rotation + (altOrientation ? " (alt)" : "")
                + " from " + mRotation + (mAltOrientation ? " (alt)" : "")
                + ", forceApp=" + mForcedAppOrientation);
        }

        mRotation = rotation;
        mAltOrientation = altOrientation;
        mPolicy.setRotationLw(mRotation);

        mWindowsFreezingScreen = true;
        mH.removeMessages(H.WINDOW_FREEZE_TIMEOUT);
        mH.sendEmptyMessageDelayed(H.WINDOW_FREEZE_TIMEOUT, WINDOW_FREEZE_TIMEOUT_DURATION);
        mWaitingForConfig = true;
        final DisplayContent displayContent = getDefaultDisplayContentLocked();
        displayContent.layoutNeeded = true;
        final int[] anim = new int[2];
        if (displayContent.isDimming()) {
            anim[0] = anim[1] = 0;
        } else {
            mPolicy.selectRotationAnimationLw(anim);
        }
        startFreezingDisplayLocked(inTransaction, anim[0], anim[1]);
        // startFreezingDisplayLocked can reset the ScreenRotationAnimation.
        screenRotationAnimation =
                mAnimator.getScreenRotationAnimationLocked(Display.DEFAULT_DISPLAY);

        // We need to update our screen size information to match the new
        // rotation.  Note that this is redundant with the later call to
        // sendNewConfiguration() that must be called after this function
        // returns...  however we need to do the screen size part of that
        // before then so we have the correct size to use when initializing
        // the rotation animation for the new rotation.
        computeScreenConfigurationLocked(null);

        final DisplayInfo displayInfo = displayContent.getDisplayInfo();
        if (!inTransaction) {
            if (SHOW_TRANSACTIONS) {
                Slog.i(TAG, ">>> OPEN TRANSACTION setRotationUnchecked");
            }
            SurfaceControl.openTransaction();
        }
        try {
            // NOTE: We disable the rotation in the emulator because
            //       it doesn't support hardware OpenGL emulation yet.
            if (CUSTOM_SCREEN_ROTATION && screenRotationAnimation != null
                    && screenRotationAnimation.hasScreenshot()) {
                if (screenRotationAnimation.setRotationInTransaction(
                        rotation, mFxSession,
                        MAX_ANIMATION_DURATION, getTransitionAnimationScaleLocked(),
                        displayInfo.logicalWidth, displayInfo.logicalHeight)) {
                    scheduleAnimationLocked();
                }
            }

            mDisplayManagerInternal.performTraversalInTransactionFromWindowManager();
        } finally {
            if (!inTransaction) {
                SurfaceControl.closeTransaction();
                if (SHOW_LIGHT_TRANSACTIONS) {
                    Slog.i(TAG, "<<< CLOSE TRANSACTION setRotationUnchecked");
                }
            }
        }

        final WindowList windows = displayContent.getWindowList();
        for (int i = windows.size() - 1; i >= 0; i--) {
            WindowState w = windows.get(i);
            if (w.mHasSurface) {
                if (DEBUG_ORIENTATION) Slog.v(TAG, "Set mOrientationChanging of " + w);
                w.mOrientationChanging = true;
                mInnerFields.mOrientationChangeComplete = false;
            }
            w.mLastFreezeDuration = 0;
        }

        for (int i=mRotationWatchers.size()-1; i>=0; i--) {
            try {
                mRotationWatchers.get(i).watcher.onRotationChanged(rotation);
            } catch (RemoteException e) {
            }
        }

        //TODO (multidisplay): Magnification is supported only for the default display.
        if (mAccessibilityController != null
                && displayContent.getDisplayId() == Display.DEFAULT_DISPLAY) {
            mAccessibilityController.onRotationChangedLocked(getDefaultDisplayContentLocked(), rotation);
        }

        return true;
    }

    @Override
    public int getRotation() {
        return mRotation;
    }

    @Override
    public boolean isRotationFrozen() {
        return mPolicy.getUserRotationMode() == WindowManagerPolicy.USER_ROTATION_LOCKED;
    }

    @Override
    public int watchRotation(IRotationWatcher watcher) {
        final IBinder watcherBinder = watcher.asBinder();
        IBinder.DeathRecipient dr = new IBinder.DeathRecipient() {
            @Override
            public void binderDied() {
                synchronized (mWindowMap) {
                    for (int i=0; i<mRotationWatchers.size(); i++) {
                        if (watcherBinder == mRotationWatchers.get(i).watcher.asBinder()) {
                            RotationWatcher removed = mRotationWatchers.remove(i);
                            IBinder binder = removed.watcher.asBinder();
                            if (binder != null) {
                                binder.unlinkToDeath(this, 0);
                            }
                            i--;
                        }
                    }
                }
            }
        };

        synchronized (mWindowMap) {
            try {
                watcher.asBinder().linkToDeath(dr, 0);
                mRotationWatchers.add(new RotationWatcher(watcher, dr));
            } catch (RemoteException e) {
                // Client died, no cleanup needed.
            }

            return mRotation;
        }
    }

    @Override
    public void removeRotationWatcher(IRotationWatcher watcher) {
        final IBinder watcherBinder = watcher.asBinder();
        synchronized (mWindowMap) {
            for (int i=0; i<mRotationWatchers.size(); i++) {
                RotationWatcher rotationWatcher = mRotationWatchers.get(i);
                if (watcherBinder == rotationWatcher.watcher.asBinder()) {
                    RotationWatcher removed = mRotationWatchers.remove(i);
                    IBinder binder = removed.watcher.asBinder();
                    if (binder != null) {
                        binder.unlinkToDeath(removed.deathRecipient, 0);
                    }
                    i--;
                }
            }
        }
    }

    /**
     * Apps that use the compact menu panel (as controlled by the panelMenuIsCompact
     * theme attribute) on devices that feature a physical options menu key attempt to position
     * their menu panel window along the edge of the screen nearest the physical menu key.
     * This lowers the travel distance between invoking the menu panel and selecting
     * a menu option.
     *
     * This method helps control where that menu is placed. Its current implementation makes
     * assumptions about the menu key and its relationship to the screen based on whether
     * the device's natural orientation is portrait (width < height) or landscape.
     *
     * The menu key is assumed to be located along the bottom edge of natural-portrait
     * devices and along the right edge of natural-landscape devices. If these assumptions
     * do not hold for the target device, this method should be changed to reflect that.
     *
     * @return A {@link Gravity} value for placing the options menu window
     */
    @Override
    public int getPreferredOptionsPanelGravity() {
        synchronized (mWindowMap) {
            final int rotation = getRotation();

            // TODO(multidisplay): Assume that such devices physical keys are on the main screen.
            final DisplayContent displayContent = getDefaultDisplayContentLocked();
            if (displayContent.mInitialDisplayWidth < displayContent.mInitialDisplayHeight) {
                // On devices with a natural orientation of portrait
                switch (rotation) {
                    default:
                    case Surface.ROTATION_0:
                        return Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM;
                    case Surface.ROTATION_90:
                        return Gravity.RIGHT | Gravity.BOTTOM;
                    case Surface.ROTATION_180:
                        return Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM;
                    case Surface.ROTATION_270:
                        return Gravity.START | Gravity.BOTTOM;
                }
            }

            // On devices with a natural orientation of landscape
            switch (rotation) {
                default:
                case Surface.ROTATION_0:
                    return Gravity.RIGHT | Gravity.BOTTOM;
                case Surface.ROTATION_90:
                    return Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM;
                case Surface.ROTATION_180:
                    return Gravity.START | Gravity.BOTTOM;
                case Surface.ROTATION_270:
                    return Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM;
            }
        }
    }

    /**
     * Starts the view server on the specified port.
     *
     * @param port The port to listener to.
     *
     * @return True if the server was successfully started, false otherwise.
     *
     * @see com.android.server.wm.ViewServer
     * @see com.android.server.wm.ViewServer#VIEW_SERVER_DEFAULT_PORT
     */
    @Override
    public boolean startViewServer(int port) {
        if (isSystemSecure()) {
            return false;
        }

        if (!checkCallingPermission(Manifest.permission.DUMP, "startViewServer")) {
            return false;
        }

        if (port < 1024) {
            return false;
        }

        if (mViewServer != null) {
            if (!mViewServer.isRunning()) {
                try {
                    return mViewServer.start();
                } catch (IOException e) {
                    Slog.w(TAG, "View server did not start");
                }
            }
            return false;
        }

        try {
            mViewServer = new ViewServer(this, port);
            return mViewServer.start();
        } catch (IOException e) {
            Slog.w(TAG, "View server did not start");
        }
        return false;
    }

    private boolean isSystemSecure() {
        return "1".equals(SystemProperties.get(SYSTEM_SECURE, "1")) &&
                "0".equals(SystemProperties.get(SYSTEM_DEBUGGABLE, "0"));
    }

    /**
     * Stops the view server if it exists.
     *
     * @return True if the server stopped, false if it wasn't started or
     *         couldn't be stopped.
     *
     * @see com.android.server.wm.ViewServer
     */
    @Override
    public boolean stopViewServer() {
        if (isSystemSecure()) {
            return false;
        }

        if (!checkCallingPermission(Manifest.permission.DUMP, "stopViewServer")) {
            return false;
        }

        if (mViewServer != null) {
            return mViewServer.stop();
        }
        return false;
    }

    /**
     * Indicates whether the view server is running.
     *
     * @return True if the server is running, false otherwise.
     *
     * @see com.android.server.wm.ViewServer
     */
    @Override
    public boolean isViewServerRunning() {
        if (isSystemSecure()) {
            return false;
        }

        if (!checkCallingPermission(Manifest.permission.DUMP, "isViewServerRunning")) {
            return false;
        }

        return mViewServer != null && mViewServer.isRunning();
    }

    /**
     * Lists all availble windows in the system. The listing is written in the
     * specified Socket's output stream with the following syntax:
     * windowHashCodeInHexadecimal windowName
     * Each line of the ouput represents a different window.
     *
     * @param client The remote client to send the listing to.
     * @return False if an error occured, true otherwise.
     */
    boolean viewServerListWindows(Socket client) {
        if (isSystemSecure()) {
            return false;
        }

        boolean result = true;

        WindowList windows = new WindowList();
        synchronized (mWindowMap) {
            //noinspection unchecked
            final int numDisplays = mDisplayContents.size();
            for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                final DisplayContent displayContent = mDisplayContents.valueAt(displayNdx);
                windows.addAll(displayContent.getWindowList());
            }
        }

        BufferedWriter out = null;

        // Any uncaught exception will crash the system process
        try {
            OutputStream clientStream = client.getOutputStream();
            out = new BufferedWriter(new OutputStreamWriter(clientStream), 8 * 1024);

            final int count = windows.size();
            for (int i = 0; i < count; i++) {
                final WindowState w = windows.get(i);
                out.write(Integer.toHexString(System.identityHashCode(w)));
                out.write(' ');
                out.append(w.mAttrs.getTitle());
                out.write('\n');
            }

            out.write("DONE.\n");
            out.flush();
        } catch (Exception e) {
            result = false;
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    result = false;
                }
            }
        }

        return result;
    }

    // TODO(multidisplay): Extend to multiple displays.
    /**
     * Returns the focused window in the following format:
     * windowHashCodeInHexadecimal windowName
     *
     * @param client The remote client to send the listing to.
     * @return False if an error occurred, true otherwise.
     */
    boolean viewServerGetFocusedWindow(Socket client) {
        if (isSystemSecure()) {
            return false;
        }

        boolean result = true;

        WindowState focusedWindow = getFocusedWindow();

        BufferedWriter out = null;

        // Any uncaught exception will crash the system process
        try {
            OutputStream clientStream = client.getOutputStream();
            out = new BufferedWriter(new OutputStreamWriter(clientStream), 8 * 1024);

            if(focusedWindow != null) {
                out.write(Integer.toHexString(System.identityHashCode(focusedWindow)));
                out.write(' ');
                out.append(focusedWindow.mAttrs.getTitle());
            }
            out.write('\n');
            out.flush();
        } catch (Exception e) {
            result = false;
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    result = false;
                }
            }
        }

        return result;
    }

    /**
     * Sends a command to a target window. The result of the command, if any, will be
     * written in the output stream of the specified socket.
     *
     * The parameters must follow this syntax:
     * windowHashcode extra
     *
     * Where XX is the length in characeters of the windowTitle.
     *
     * The first parameter is the target window. The window with the specified hashcode
     * will be the target. If no target can be found, nothing happens. The extra parameters
     * will be delivered to the target window and as parameters to the command itself.
     *
     * @param client The remote client to sent the result, if any, to.
     * @param command The command to execute.
     * @param parameters The command parameters.
     *
     * @return True if the command was successfully delivered, false otherwise. This does
     *         not indicate whether the command itself was successful.
     */
    boolean viewServerWindowCommand(Socket client, String command, String parameters) {
        if (isSystemSecure()) {
            return false;
        }

        boolean success = true;
        Parcel data = null;
        Parcel reply = null;

        BufferedWriter out = null;

        // Any uncaught exception will crash the system process
        try {
            // Find the hashcode of the window
            int index = parameters.indexOf(' ');
            if (index == -1) {
                index = parameters.length();
            }
            final String code = parameters.substring(0, index);
            int hashCode = (int) Long.parseLong(code, 16);

            // Extract the command's parameter after the window description
            if (index < parameters.length()) {
                parameters = parameters.substring(index + 1);
            } else {
                parameters = "";
            }

            final WindowState window = findWindow(hashCode);
            if (window == null) {
                return false;
            }

            data = Parcel.obtain();
            data.writeInterfaceToken("android.view.IWindow");
            data.writeString(command);
            data.writeString(parameters);
            data.writeInt(1);
            ParcelFileDescriptor.fromSocket(client).writeToParcel(data, 0);

            reply = Parcel.obtain();

            final IBinder binder = window.mClient.asBinder();
            // TODO: GET THE TRANSACTION CODE IN A SAFER MANNER
            binder.transact(IBinder.FIRST_CALL_TRANSACTION, data, reply, 0);

            reply.readException();

            if (!client.isOutputShutdown()) {
                out = new BufferedWriter(new OutputStreamWriter(client.getOutputStream()));
                out.write("DONE\n");
                out.flush();
            }

        } catch (Exception e) {
            Slog.w(TAG, "Could not send command " + command + " with parameters " + parameters, e);
            success = false;
        } finally {
            if (data != null) {
                data.recycle();
            }
            if (reply != null) {
                reply.recycle();
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {

                }
            }
        }

        return success;
    }

    public void addWindowChangeListener(WindowChangeListener listener) {
        synchronized(mWindowMap) {
            mWindowChangeListeners.add(listener);
        }
    }

    public void removeWindowChangeListener(WindowChangeListener listener) {
        synchronized(mWindowMap) {
            mWindowChangeListeners.remove(listener);
        }
    }

    private void notifyWindowsChanged() {
        WindowChangeListener[] windowChangeListeners;
        synchronized(mWindowMap) {
            if(mWindowChangeListeners.isEmpty()) {
                return;
            }
            windowChangeListeners = new WindowChangeListener[mWindowChangeListeners.size()];
            windowChangeListeners = mWindowChangeListeners.toArray(windowChangeListeners);
        }
        int N = windowChangeListeners.length;
        for(int i = 0; i < N; i++) {
            windowChangeListeners[i].windowsChanged();
        }
    }

    private void notifyFocusChanged() {
        WindowChangeListener[] windowChangeListeners;
        synchronized(mWindowMap) {
            if(mWindowChangeListeners.isEmpty()) {
                return;
            }
            windowChangeListeners = new WindowChangeListener[mWindowChangeListeners.size()];
            windowChangeListeners = mWindowChangeListeners.toArray(windowChangeListeners);
        }
        int N = windowChangeListeners.length;
        for(int i = 0; i < N; i++) {
            windowChangeListeners[i].focusChanged();
        }
    }

    private WindowState findWindow(int hashCode) {
        if (hashCode == -1) {
            // TODO(multidisplay): Extend to multiple displays.
            return getFocusedWindow();
        }

        synchronized (mWindowMap) {
            final int numDisplays = mDisplayContents.size();
            for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                final WindowList windows = mDisplayContents.valueAt(displayNdx).getWindowList();
                final int numWindows = windows.size();
                for (int winNdx = 0; winNdx < numWindows; ++winNdx) {
                    final WindowState w = windows.get(winNdx);
                    if (System.identityHashCode(w) == hashCode) {
                        return w;
                    }
                }
            }
        }

        return null;
    }

    /*
     * Instruct the Activity Manager to fetch the current configuration and broadcast
     * that to config-changed listeners if appropriate.
     */
    void sendNewConfiguration() {
        try {
            mActivityManager.updateConfiguration(null);
        } catch (RemoteException e) {
        }
    }

    public Configuration computeNewConfiguration() {
        synchronized (mWindowMap) {
            Configuration config = computeNewConfigurationLocked();
            if (config == null && mWaitingForConfig) {
                // Nothing changed but we are waiting for something... stop that!
                mWaitingForConfig = false;
                mLastFinishedFreezeSource = "new-config";
                performLayoutAndPlaceSurfacesLocked();
            }
            return config;
        }
    }

    Configuration computeNewConfigurationLocked() {
        Configuration config = new Configuration();
        config.fontScale = 0;
        if (!computeScreenConfigurationLocked(config)) {
            return null;
        }
        return config;
    }

    private void adjustDisplaySizeRanges(DisplayInfo displayInfo, int rotation, int dw, int dh) {
        // TODO: Multidisplay: for now only use with default display.
        final int width = mPolicy.getConfigDisplayWidth(dw, dh, rotation);
        if (width < displayInfo.smallestNominalAppWidth) {
            displayInfo.smallestNominalAppWidth = width;
        }
        if (width > displayInfo.largestNominalAppWidth) {
            displayInfo.largestNominalAppWidth = width;
        }
        final int height = mPolicy.getConfigDisplayHeight(dw, dh, rotation);
        if (height < displayInfo.smallestNominalAppHeight) {
            displayInfo.smallestNominalAppHeight = height;
        }
        if (height > displayInfo.largestNominalAppHeight) {
            displayInfo.largestNominalAppHeight = height;
        }
    }

    private int reduceConfigLayout(int curLayout, int rotation, float density,
            int dw, int dh) {
        // TODO: Multidisplay: for now only use with default display.
        // Get the app screen size at this rotation.
        int w = mPolicy.getNonDecorDisplayWidth(dw, dh, rotation);
        int h = mPolicy.getNonDecorDisplayHeight(dw, dh, rotation);

        // Compute the screen layout size class for this rotation.
        int longSize = w;
        int shortSize = h;
        if (longSize < shortSize) {
            int tmp = longSize;
            longSize = shortSize;
            shortSize = tmp;
        }
        longSize = (int)(longSize/density);
        shortSize = (int)(shortSize/density);
        return Configuration.reduceScreenLayout(curLayout, longSize, shortSize);
    }

    private void computeSizeRangesAndScreenLayout(DisplayInfo displayInfo, boolean rotated,
                  int dw, int dh, float density, Configuration outConfig) {
        // TODO: Multidisplay: for now only use with default display.

        // We need to determine the smallest width that will occur under normal
        // operation.  To this, start with the base screen size and compute the
        // width under the different possible rotations.  We need to un-rotate
        // the current screen dimensions before doing this.
        int unrotDw, unrotDh;
        if (rotated) {
            unrotDw = dh;
            unrotDh = dw;
        } else {
            unrotDw = dw;
            unrotDh = dh;
        }
        displayInfo.smallestNominalAppWidth = 1<<30;
        displayInfo.smallestNominalAppHeight = 1<<30;
        displayInfo.largestNominalAppWidth = 0;
        displayInfo.largestNominalAppHeight = 0;
        adjustDisplaySizeRanges(displayInfo, Surface.ROTATION_0, unrotDw, unrotDh);
        adjustDisplaySizeRanges(displayInfo, Surface.ROTATION_90, unrotDh, unrotDw);
        adjustDisplaySizeRanges(displayInfo, Surface.ROTATION_180, unrotDw, unrotDh);
        adjustDisplaySizeRanges(displayInfo, Surface.ROTATION_270, unrotDh, unrotDw);
        int sl = Configuration.resetScreenLayout(outConfig.screenLayout);
        sl = reduceConfigLayout(sl, Surface.ROTATION_0, density, unrotDw, unrotDh);
        sl = reduceConfigLayout(sl, Surface.ROTATION_90, density, unrotDh, unrotDw);
        sl = reduceConfigLayout(sl, Surface.ROTATION_180, density, unrotDw, unrotDh);
        sl = reduceConfigLayout(sl, Surface.ROTATION_270, density, unrotDh, unrotDw);
        outConfig.smallestScreenWidthDp = (int)(displayInfo.smallestNominalAppWidth / density);
        outConfig.screenLayout = sl;
    }

    private int reduceCompatConfigWidthSize(int curSize, int rotation, DisplayMetrics dm,
            int dw, int dh) {
        // TODO: Multidisplay: for now only use with default display.
        dm.noncompatWidthPixels = mPolicy.getNonDecorDisplayWidth(dw, dh, rotation);
        dm.noncompatHeightPixels = mPolicy.getNonDecorDisplayHeight(dw, dh, rotation);
        float scale = CompatibilityInfo.computeCompatibleScaling(dm, null);
        int size = (int)(((dm.noncompatWidthPixels / scale) / dm.density) + .5f);
        if (curSize == 0 || size < curSize) {
            curSize = size;
        }
        return curSize;
    }

    private int computeCompatSmallestWidth(boolean rotated, DisplayMetrics dm, int dw, int dh) {
        // TODO: Multidisplay: for now only use with default display.
        mTmpDisplayMetrics.setTo(dm);
        final DisplayMetrics tmpDm = mTmpDisplayMetrics;
        final int unrotDw, unrotDh;
        if (rotated) {
            unrotDw = dh;
            unrotDh = dw;
        } else {
            unrotDw = dw;
            unrotDh = dh;
        }
        int sw = reduceCompatConfigWidthSize(0, Surface.ROTATION_0, tmpDm, unrotDw, unrotDh);
        sw = reduceCompatConfigWidthSize(sw, Surface.ROTATION_90, tmpDm, unrotDh, unrotDw);
        sw = reduceCompatConfigWidthSize(sw, Surface.ROTATION_180, tmpDm, unrotDw, unrotDh);
        sw = reduceCompatConfigWidthSize(sw, Surface.ROTATION_270, tmpDm, unrotDh, unrotDw);
        return sw;
    }

    boolean computeScreenConfigurationLocked(Configuration config) {
        if (!mDisplayReady) {
            return false;
        }

        // TODO(multidisplay): For now, apply Configuration to main screen only.
        final DisplayContent displayContent = getDefaultDisplayContentLocked();

        // Use the effective "visual" dimensions based on current rotation
        final boolean rotated = (mRotation == Surface.ROTATION_90
                || mRotation == Surface.ROTATION_270);
        final int realdw = rotated ?
                displayContent.mBaseDisplayHeight : displayContent.mBaseDisplayWidth;
        final int realdh = rotated ?
                displayContent.mBaseDisplayWidth : displayContent.mBaseDisplayHeight;
        int dw = realdw;
        int dh = realdh;

        if (mAltOrientation) {
            if (realdw > realdh) {
                // Turn landscape into portrait.
                int maxw = (int)(realdh/1.3f);
                if (maxw < realdw) {
                    dw = maxw;
                }
            } else {
                // Turn portrait into landscape.
                int maxh = (int)(realdw/1.3f);
                if (maxh < realdh) {
                    dh = maxh;
                }
            }
        }

        if (config != null) {
            config.orientation = (dw <= dh) ? Configuration.ORIENTATION_PORTRAIT :
                    Configuration.ORIENTATION_LANDSCAPE;
        }

        // Update application display metrics.
        final int appWidth = mPolicy.getNonDecorDisplayWidth(dw, dh, mRotation);
        final int appHeight = mPolicy.getNonDecorDisplayHeight(dw, dh, mRotation);
        final DisplayInfo displayInfo = displayContent.getDisplayInfo();
        synchronized(displayContent.mDisplaySizeLock) {
            displayInfo.rotation = mRotation;
            displayInfo.logicalWidth = dw;
            displayInfo.logicalHeight = dh;
            displayInfo.logicalDensityDpi = displayContent.mBaseDisplayDensity;
            displayInfo.appWidth = appWidth;
            displayInfo.appHeight = appHeight;
            displayInfo.getLogicalMetrics(mRealDisplayMetrics,
                    CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO, null);
            displayInfo.getAppMetrics(mDisplayMetrics);
            mDisplayManagerInternal.setDisplayInfoOverrideFromWindowManager(
                    displayContent.getDisplayId(), displayInfo);
        }
        if (false) {
            Slog.i(TAG, "Set app display size: " + appWidth + " x " + appHeight);
        }

        final DisplayMetrics dm = mDisplayMetrics;
        mCompatibleScreenScale = CompatibilityInfo.computeCompatibleScaling(dm,
                mCompatDisplayMetrics);

        if (config != null) {
            config.screenWidthDp = (int)(mPolicy.getConfigDisplayWidth(dw, dh, mRotation)
                    / dm.density);
            config.screenHeightDp = (int)(mPolicy.getConfigDisplayHeight(dw, dh, mRotation)
                    / dm.density);
            computeSizeRangesAndScreenLayout(displayInfo, rotated, dw, dh, dm.density, config);

            config.compatScreenWidthDp = (int)(config.screenWidthDp / mCompatibleScreenScale);
            config.compatScreenHeightDp = (int)(config.screenHeightDp / mCompatibleScreenScale);
            config.compatSmallestScreenWidthDp = computeCompatSmallestWidth(rotated, dm, dw, dh);
            config.densityDpi = displayContent.mBaseDisplayDensity;

            // Update the configuration based on available input devices, lid switch,
            // and platform configuration.
            config.touchscreen = Configuration.TOUCHSCREEN_NOTOUCH;
            config.keyboard = Configuration.KEYBOARD_NOKEYS;
            config.navigation = Configuration.NAVIGATION_NONAV;

            int keyboardPresence = 0;
            int navigationPresence = 0;
            final InputDevice[] devices = mInputManager.getInputDevices();
            final int len = devices.length;
            for (int i = 0; i < len; i++) {
                InputDevice device = devices[i];
                if (!device.isVirtual()) {
                    final int sources = device.getSources();
                    final int presenceFlag = device.isExternal() ?
                            WindowManagerPolicy.PRESENCE_EXTERNAL :
                                    WindowManagerPolicy.PRESENCE_INTERNAL;

                    if (mIsTouchDevice) {
                        if ((sources & InputDevice.SOURCE_TOUCHSCREEN) ==
                                InputDevice.SOURCE_TOUCHSCREEN) {
                            config.touchscreen = Configuration.TOUCHSCREEN_FINGER;
                        }
                    } else {
                        config.touchscreen = Configuration.TOUCHSCREEN_NOTOUCH;
                    }

                    if ((sources & InputDevice.SOURCE_TRACKBALL) == InputDevice.SOURCE_TRACKBALL) {
                        config.navigation = Configuration.NAVIGATION_TRACKBALL;
                        navigationPresence |= presenceFlag;
                    } else if ((sources & InputDevice.SOURCE_DPAD) == InputDevice.SOURCE_DPAD
                            && config.navigation == Configuration.NAVIGATION_NONAV) {
                        config.navigation = Configuration.NAVIGATION_DPAD;
                        navigationPresence |= presenceFlag;
                    }

                    if (device.getKeyboardType() == InputDevice.KEYBOARD_TYPE_ALPHABETIC) {
                        config.keyboard = Configuration.KEYBOARD_QWERTY;
                        keyboardPresence |= presenceFlag;
                    }
                }
            }

            // Determine whether a hard keyboard is available and enabled.
            boolean hardKeyboardAvailable = config.keyboard != Configuration.KEYBOARD_NOKEYS;
            if (hardKeyboardAvailable != mHardKeyboardAvailable) {
                mHardKeyboardAvailable = hardKeyboardAvailable;
                mH.removeMessages(H.REPORT_HARD_KEYBOARD_STATUS_CHANGE);
                mH.sendEmptyMessage(H.REPORT_HARD_KEYBOARD_STATUS_CHANGE);
            }
            if (mShowImeWithHardKeyboard) {
                config.keyboard = Configuration.KEYBOARD_NOKEYS;
            }

            // Let the policy update hidden states.
            config.keyboardHidden = Configuration.KEYBOARDHIDDEN_NO;
            config.hardKeyboardHidden = Configuration.HARDKEYBOARDHIDDEN_NO;
            config.navigationHidden = Configuration.NAVIGATIONHIDDEN_NO;
            mPolicy.adjustConfigurationLw(config, keyboardPresence, navigationPresence);
        }

        return true;
    }

    public boolean isHardKeyboardAvailable() {
        synchronized (mWindowMap) {
            return mHardKeyboardAvailable;
        }
    }

    public void updateShowImeWithHardKeyboard() {
        boolean showImeWithHardKeyboard = Settings.Secure.getIntForUser(
                mContext.getContentResolver(), Settings.Secure.SHOW_IME_WITH_HARD_KEYBOARD, 0,
                mCurrentUserId) == 1;
        synchronized (mWindowMap) {
            mShowImeWithHardKeyboard = showImeWithHardKeyboard;
        }
    }

    public void setOnHardKeyboardStatusChangeListener(
            OnHardKeyboardStatusChangeListener listener) {
        synchronized (mWindowMap) {
            mHardKeyboardStatusChangeListener = listener;
        }
    }

    void notifyHardKeyboardStatusChange() {
        final boolean available;
        final OnHardKeyboardStatusChangeListener listener;
        synchronized (mWindowMap) {
            listener = mHardKeyboardStatusChangeListener;
            available = mHardKeyboardAvailable;
        }
        if (listener != null) {
            listener.onHardKeyboardStatusChange(available);
        }
    }

    // -------------------------------------------------------------
    // Drag and drop
    // -------------------------------------------------------------

    IBinder prepareDragSurface(IWindow window, SurfaceSession session,
            int flags, int width, int height, Surface outSurface) {
        if (DEBUG_DRAG) {
            Slog.d(TAG, "prepare drag surface: w=" + width + " h=" + height
                    + " flags=" + Integer.toHexString(flags) + " win=" + window
                    + " asbinder=" + window.asBinder());
        }

        final int callerPid = Binder.getCallingPid();
        final long origId = Binder.clearCallingIdentity();
        IBinder token = null;

        try {
            synchronized (mWindowMap) {
                try {
                    if (mDragState == null) {
                        // TODO(multi-display): support other displays
                        final DisplayContent displayContent = getDefaultDisplayContentLocked();
                        final Display display = displayContent.getDisplay();
                        SurfaceControl surface = new SurfaceControl(session, "drag surface",
                                width, height, PixelFormat.TRANSLUCENT, SurfaceControl.HIDDEN);
                        surface.setLayerStack(display.getLayerStack());
                        if (SHOW_TRANSACTIONS) Slog.i(TAG, "  DRAG "
                                + surface + ": CREATE");
                        outSurface.copyFrom(surface);
                        final IBinder winBinder = window.asBinder();
                        token = new Binder();
                        mDragState = new DragState(this, token, surface, /*flags*/ 0, winBinder);
                        token = mDragState.mToken = new Binder();

                        // 5 second timeout for this window to actually begin the drag
                        mH.removeMessages(H.DRAG_START_TIMEOUT, winBinder);
                        Message msg = mH.obtainMessage(H.DRAG_START_TIMEOUT, winBinder);
                        mH.sendMessageDelayed(msg, 5000);
                    } else {
                        Slog.w(TAG, "Drag already in progress");
                    }
                } catch (OutOfResourcesException e) {
                    Slog.e(TAG, "Can't allocate drag surface w=" + width + " h=" + height, e);
                    if (mDragState != null) {
                        mDragState.reset();
                        mDragState = null;
                    }
                }
            }
        } finally {
            Binder.restoreCallingIdentity(origId);
        }

        return token;
    }

    // -------------------------------------------------------------
    // Input Events and Focus Management
    // -------------------------------------------------------------

    final InputMonitor mInputMonitor = new InputMonitor(this);
    private boolean mEventDispatchingEnabled;

    @Override
    public void pauseKeyDispatching(IBinder _token) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "pauseKeyDispatching()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized (mWindowMap) {
            WindowToken token = mTokenMap.get(_token);
            if (token != null) {
                mInputMonitor.pauseDispatchingLw(token);
            }
        }
    }

    @Override
    public void resumeKeyDispatching(IBinder _token) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "resumeKeyDispatching()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized (mWindowMap) {
            WindowToken token = mTokenMap.get(_token);
            if (token != null) {
                mInputMonitor.resumeDispatchingLw(token);
            }
        }
    }

    @Override
    public void setEventDispatching(boolean enabled) {
        if (!checkCallingPermission(android.Manifest.permission.MANAGE_APP_TOKENS,
                "setEventDispatching()")) {
            throw new SecurityException("Requires MANAGE_APP_TOKENS permission");
        }

        synchronized (mWindowMap) {
            mEventDispatchingEnabled = enabled;
            if (mDisplayEnabled) {
                mInputMonitor.setEventDispatchingLw(enabled);
            }
        }
    }

    private WindowState getFocusedWindow() {
        synchronized (mWindowMap) {
            return getFocusedWindowLocked();
        }
    }

    private WindowState getFocusedWindowLocked() {
        return mCurrentFocus;
    }

    public boolean detectSafeMode() {
        if (!mInputMonitor.waitForInputDevicesReady(
                INPUT_DEVICES_READY_FOR_SAFE_MODE_DETECTION_TIMEOUT_MILLIS)) {
            Slog.w(TAG, "Devices still not ready after waiting "
                   + INPUT_DEVICES_READY_FOR_SAFE_MODE_DETECTION_TIMEOUT_MILLIS
                   + " milliseconds before attempting to detect safe mode.");
        }

        int menuState = mInputManager.getKeyCodeState(-1, InputDevice.SOURCE_ANY,
                KeyEvent.KEYCODE_MENU);
        int sState = mInputManager.getKeyCodeState(-1, InputDevice.SOURCE_ANY, KeyEvent.KEYCODE_S);
        int dpadState = mInputManager.getKeyCodeState(-1, InputDevice.SOURCE_DPAD,
                KeyEvent.KEYCODE_DPAD_CENTER);
        int trackballState = mInputManager.getScanCodeState(-1, InputDevice.SOURCE_TRACKBALL,
                InputManagerService.BTN_MOUSE);
        int volumeDownState = mInputManager.getKeyCodeState(-1, InputDevice.SOURCE_ANY,
                KeyEvent.KEYCODE_VOLUME_DOWN);
        mSafeMode = menuState > 0 || sState > 0 || dpadState > 0 || trackballState > 0
                || volumeDownState > 0;
        try {
            if (SystemProperties.getInt(ShutdownThread.REBOOT_SAFEMODE_PROPERTY, 0) != 0) {
                mSafeMode = true;
                SystemProperties.set(ShutdownThread.REBOOT_SAFEMODE_PROPERTY, "");
            }
        } catch (IllegalArgumentException e) {
        }
        if (mSafeMode) {
            Log.i(TAG, "SAFE MODE ENABLED (menu=" + menuState + " s=" + sState
                    + " dpad=" + dpadState + " trackball=" + trackballState + ")");
        } else {
            Log.i(TAG, "SAFE MODE not enabled");
        }
        mPolicy.setSafeMode(mSafeMode);
        return mSafeMode;
    }

    public void displayReady() {
        displayReady(Display.DEFAULT_DISPLAY);

        synchronized(mWindowMap) {
            final DisplayContent displayContent = getDefaultDisplayContentLocked();
            readForcedDisplaySizeAndDensityLocked(displayContent);
            mDisplayReady = true;
        }

        try {
            mActivityManager.updateConfiguration(null);
        } catch (RemoteException e) {
        }

        synchronized(mWindowMap) {
            mIsTouchDevice = mContext.getPackageManager().hasSystemFeature(
                    PackageManager.FEATURE_TOUCHSCREEN);
            configureDisplayPolicyLocked(getDefaultDisplayContentLocked());
        }

        try {
            mActivityManager.updateConfiguration(null);
        } catch (RemoteException e) {
        }
    }

    private void displayReady(int displayId) {
        synchronized(mWindowMap) {
            final DisplayContent displayContent = getDisplayContentLocked(displayId);
            if (displayContent != null) {
                mAnimator.addDisplayLocked(displayId);
                synchronized(displayContent.mDisplaySizeLock) {
                    // Bootstrap the default logical display from the display manager.
                    final DisplayInfo displayInfo = displayContent.getDisplayInfo();
                    DisplayInfo newDisplayInfo = mDisplayManagerInternal.getDisplayInfo(displayId);
                    if (newDisplayInfo != null) {
                        displayInfo.copyFrom(newDisplayInfo);
                    }
                    displayContent.mInitialDisplayWidth = displayInfo.logicalWidth;
                    displayContent.mInitialDisplayHeight = displayInfo.logicalHeight;
                    displayContent.mInitialDisplayDensity = displayInfo.logicalDensityDpi;
                    displayContent.mBaseDisplayWidth = displayContent.mInitialDisplayWidth;
                    displayContent.mBaseDisplayHeight = displayContent.mInitialDisplayHeight;
                    displayContent.mBaseDisplayDensity = displayContent.mInitialDisplayDensity;
                    displayContent.mBaseDisplayRect.set(0, 0,
                            displayContent.mBaseDisplayWidth, displayContent.mBaseDisplayHeight);
                }
            }
        }
    }

    public void systemReady() {
        mPolicy.systemReady();
    }

    // -------------------------------------------------------------
    // Async Handler
    // -------------------------------------------------------------

    final class H extends Handler {
        public static final int REPORT_FOCUS_CHANGE = 2;
        public static final int REPORT_LOSING_FOCUS = 3;
        public static final int DO_TRAVERSAL = 4;
        public static final int ADD_STARTING = 5;
        public static final int REMOVE_STARTING = 6;
        public static final int FINISHED_STARTING = 7;
        public static final int REPORT_APPLICATION_TOKEN_WINDOWS = 8;
        public static final int REPORT_APPLICATION_TOKEN_DRAWN = 9;
        public static final int WINDOW_FREEZE_TIMEOUT = 11;

        public static final int APP_TRANSITION_TIMEOUT = 13;
        public static final int PERSIST_ANIMATION_SCALE = 14;
        public static final int FORCE_GC = 15;
        public static final int ENABLE_SCREEN = 16;
        public static final int APP_FREEZE_TIMEOUT = 17;
        public static final int SEND_NEW_CONFIGURATION = 18;
        public static final int REPORT_WINDOWS_CHANGE = 19;
        public static final int DRAG_START_TIMEOUT = 20;
        public static final int DRAG_END_TIMEOUT = 21;
        public static final int REPORT_HARD_KEYBOARD_STATUS_CHANGE = 22;
        public static final int BOOT_TIMEOUT = 23;
        public static final int WAITING_FOR_DRAWN_TIMEOUT = 24;
        public static final int SHOW_STRICT_MODE_VIOLATION = 25;
        public static final int DO_ANIMATION_CALLBACK = 26;

        public static final int DO_DISPLAY_ADDED = 27;
        public static final int DO_DISPLAY_REMOVED = 28;
        public static final int DO_DISPLAY_CHANGED = 29;

        public static final int CLIENT_FREEZE_TIMEOUT = 30;
        public static final int TAP_OUTSIDE_STACK = 31;
        public static final int NOTIFY_ACTIVITY_DRAWN = 32;

        public static final int ALL_WINDOWS_DRAWN = 33;

        public static final int NEW_ANIMATOR_SCALE = 34;

        public static final int SHOW_DISPLAY_MASK = 35;

        @Override
        public void handleMessage(Message msg) {
            if (DEBUG_WINDOW_TRACE) {
                Slog.v(TAG, "handleMessage: entry what=" + msg.what);
            }
            switch (msg.what) {
                case REPORT_FOCUS_CHANGE: {
                    WindowState lastFocus;
                    WindowState newFocus;

                    synchronized(mWindowMap) {
                        lastFocus = mLastFocus;
                        newFocus = mCurrentFocus;
                        if (lastFocus == newFocus) {
                            // Focus is not changing, so nothing to do.
                            return;
                        }
                        mLastFocus = newFocus;
                        if (DEBUG_FOCUS_LIGHT) Slog.i(TAG, "Focus moving from " + lastFocus +
                                " to " + newFocus);
                        if (newFocus != null && lastFocus != null
                                && !newFocus.isDisplayedLw()) {
                            //Slog.i(TAG, "Delaying loss of focus...");
                            mLosingFocus.add(lastFocus);
                            lastFocus = null;
                        }
                    }

                    //System.out.println("Changing focus from " + lastFocus
                    //                   + " to " + newFocus);
                    if (newFocus != null) {
                        if (DEBUG_FOCUS_LIGHT) Slog.i(TAG, "Gaining focus: " + newFocus);
                        newFocus.reportFocusChangedSerialized(true, mInTouchMode);
                        notifyFocusChanged();
                    }

                    if (lastFocus != null) {
                        if (DEBUG_FOCUS_LIGHT) Slog.i(TAG, "Losing focus: " + lastFocus);
                        lastFocus.reportFocusChangedSerialized(false, mInTouchMode);
                    }
                } break;

                case REPORT_LOSING_FOCUS: {
                    ArrayList<WindowState> losers;

                    synchronized(mWindowMap) {
                        losers = mLosingFocus;
                        mLosingFocus = new ArrayList<WindowState>();
                    }

                    final int N = losers.size();
                    for (int i=0; i<N; i++) {
                        if (DEBUG_FOCUS_LIGHT) Slog.i(TAG, "Losing delayed focus: " +
                                losers.get(i));
                        losers.get(i).reportFocusChangedSerialized(false, mInTouchMode);
                    }
                } break;

                case DO_TRAVERSAL: {
                    synchronized(mWindowMap) {
                        mTraversalScheduled = false;
                        performLayoutAndPlaceSurfacesLocked();
                    }
                } break;

                case ADD_STARTING: {
                    final AppWindowToken wtoken = (AppWindowToken)msg.obj;
                    final StartingData sd = wtoken.startingData;

                    if (sd == null) {
                        // Animation has been canceled... do nothing.
                        return;
                    }

                    if (DEBUG_STARTING_WINDOW) Slog.v(TAG, "Add starting "
                            + wtoken + ": pkg=" + sd.pkg);

                    View view = null;
                    try {
                        view = mPolicy.addStartingWindow(
                            wtoken.token, sd.pkg, sd.theme, sd.compatInfo,
                            sd.nonLocalizedLabel, sd.labelRes, sd.icon, sd.logo, sd.windowFlags);
                    } catch (Exception e) {
                        Slog.w(TAG, "Exception when adding starting window", e);
                    }

                    if (view != null) {
                        boolean abort = false;

                        synchronized(mWindowMap) {
                            if (wtoken.removed || wtoken.startingData == null) {
                                // If the window was successfully added, then
                                // we need to remove it.
                                if (wtoken.startingWindow != null) {
                                    if (DEBUG_STARTING_WINDOW) Slog.v(TAG,
                                            "Aborted starting " + wtoken
                                            + ": removed=" + wtoken.removed
                                            + " startingData=" + wtoken.startingData);
                                    wtoken.startingWindow = null;
                                    wtoken.startingData = null;
                                    abort = true;
                                }
                            } else {
                                wtoken.startingView = view;
                            }
                            if (DEBUG_STARTING_WINDOW && !abort) Slog.v(TAG,
                                    "Added starting " + wtoken
                                    + ": startingWindow="
                                    + wtoken.startingWindow + " startingView="
                                    + wtoken.startingView);
                        }

                        if (abort) {
                            try {
                                mPolicy.removeStartingWindow(wtoken.token, view);
                            } catch (Exception e) {
                                Slog.w(TAG, "Exception when removing starting window", e);
                            }
                        }
                    }
                } break;

                case REMOVE_STARTING: {
                    final AppWindowToken wtoken = (AppWindowToken)msg.obj;
                    IBinder token = null;
                    View view = null;
                    synchronized (mWindowMap) {
                        if (DEBUG_STARTING_WINDOW) Slog.v(TAG, "Remove starting "
                                + wtoken + ": startingWindow="
                                + wtoken.startingWindow + " startingView="
                                + wtoken.startingView);
                        if (wtoken.startingWindow != null) {
                            view = wtoken.startingView;
                            token = wtoken.token;
                            wtoken.startingData = null;
                            wtoken.startingView = null;
                            wtoken.startingWindow = null;
                            wtoken.startingDisplayed = false;
                        }
                    }
                    if (view != null) {
                        try {
                            mPolicy.removeStartingWindow(token, view);
                        } catch (Exception e) {
                            Slog.w(TAG, "Exception when removing starting window", e);
                        }
                    }
                } break;

                case FINISHED_STARTING: {
                    IBinder token = null;
                    View view = null;
                    while (true) {
                        synchronized (mWindowMap) {
                            final int N = mFinishedStarting.size();
                            if (N <= 0) {
                                break;
                            }
                            AppWindowToken wtoken = mFinishedStarting.remove(N-1);

                            if (DEBUG_STARTING_WINDOW) Slog.v(TAG,
                                    "Finished starting " + wtoken
                                    + ": startingWindow=" + wtoken.startingWindow
                                    + " startingView=" + wtoken.startingView);

                            if (wtoken.startingWindow == null) {
                                continue;
                            }

                            view = wtoken.startingView;
                            token = wtoken.token;
                            wtoken.startingData = null;
                            wtoken.startingView = null;
                            wtoken.startingWindow = null;
                            wtoken.startingDisplayed = false;
                        }

                        try {
                            mPolicy.removeStartingWindow(token, view);
                        } catch (Exception e) {
                            Slog.w(TAG, "Exception when removing starting window", e);
                        }
                    }
                } break;

                case REPORT_APPLICATION_TOKEN_DRAWN: {
                    final AppWindowToken wtoken = (AppWindowToken)msg.obj;

                    try {
                        if (DEBUG_VISIBILITY) Slog.v(
                                TAG, "Reporting drawn in " + wtoken);
                        wtoken.appToken.windowsDrawn();
                    } catch (RemoteException ex) {
                    }
                } break;

                case REPORT_APPLICATION_TOKEN_WINDOWS: {
                    final AppWindowToken wtoken = (AppWindowToken)msg.obj;

                    boolean nowVisible = msg.arg1 != 0;
                    boolean nowGone = msg.arg2 != 0;

                    try {
                        if (DEBUG_VISIBILITY) Slog.v(
                                TAG, "Reporting visible in " + wtoken
                                + " visible=" + nowVisible
                                + " gone=" + nowGone);
                        if (nowVisible) {
                            wtoken.appToken.windowsVisible();
                        } else {
                            wtoken.appToken.windowsGone();
                        }
                    } catch (RemoteException ex) {
                    }
                } break;

                case WINDOW_FREEZE_TIMEOUT: {
                    // TODO(multidisplay): Can non-default displays rotate?
                    synchronized (mWindowMap) {
                        Slog.w(TAG, "Window freeze timeout expired.");
                        final WindowList windows = getDefaultWindowListLocked();
                        int i = windows.size();
                        while (i > 0) {
                            i--;
                            WindowState w = windows.get(i);
                            if (w.mOrientationChanging) {
                                w.mOrientationChanging = false;
                                w.mLastFreezeDuration = (int)(SystemClock.elapsedRealtime()
                                        - mDisplayFreezeTime);
                                Slog.w(TAG, "Force clearing orientation change: " + w);
                            }
                        }
                        performLayoutAndPlaceSurfacesLocked();
                    }
                    break;
                }

                case APP_TRANSITION_TIMEOUT: {
                    synchronized (mWindowMap) {
                        if (mAppTransition.isTransitionSet()) {
                            if (DEBUG_APP_TRANSITIONS) Slog.v(TAG, "*** APP TRANSITION TIMEOUT");
                            mAppTransition.setTimeout();
                            performLayoutAndPlaceSurfacesLocked();
                        }
                    }
                    break;
                }

                case PERSIST_ANIMATION_SCALE: {
                    Settings.Global.putFloat(mContext.getContentResolver(),
                            Settings.Global.WINDOW_ANIMATION_SCALE, mWindowAnimationScaleSetting);
                    Settings.Global.putFloat(mContext.getContentResolver(),
                            Settings.Global.TRANSITION_ANIMATION_SCALE,
                            mTransitionAnimationScaleSetting);
                    Settings.Global.putFloat(mContext.getContentResolver(),
                            Settings.Global.ANIMATOR_DURATION_SCALE, mAnimatorDurationScaleSetting);
                    break;
                }

                case FORCE_GC: {
                    synchronized (mWindowMap) {
                        // Since we're holding both mWindowMap and mAnimator we don't need to
                        // hold mAnimator.mLayoutToAnim.
                        if (mAnimator.mAnimating || mAnimationScheduled) {
                            // If we are animating, don't do the gc now but
                            // delay a bit so we don't interrupt the animation.
                            sendEmptyMessageDelayed(H.FORCE_GC, 2000);
                            return;
                        }
                        // If we are currently rotating the display, it will
                        // schedule a new message when done.
                        if (mDisplayFrozen) {
                            return;
                        }
                    }
                    Runtime.getRuntime().gc();
                    break;
                }

                case ENABLE_SCREEN: {
                    performEnableScreen();
                    break;
                }

                case APP_FREEZE_TIMEOUT: {
                    synchronized (mWindowMap) {
                        Slog.w(TAG, "App freeze timeout expired.");
                        final int numStacks = mStackIdToStack.size();
                        for (int stackNdx = 0; stackNdx < numStacks; ++stackNdx) {
                            final TaskStack stack = mStackIdToStack.valueAt(stackNdx);
                            final ArrayList<Task> tasks = stack.getTasks();
                            for (int taskNdx = tasks.size() - 1; taskNdx >= 0; --taskNdx) {
                                AppTokenList tokens = tasks.get(taskNdx).mAppTokens;
                                for (int tokenNdx = tokens.size() - 1; tokenNdx >= 0; --tokenNdx) {
                                    AppWindowToken tok = tokens.get(tokenNdx);
                                    if (tok.mAppAnimator.freezingScreen) {
                                        Slog.w(TAG, "Force clearing freeze: " + tok);
                                        unsetAppFreezingScreenLocked(tok, true, true);
                                    }
                                }
                            }
                        }
                    }
                    break;
                }

                case CLIENT_FREEZE_TIMEOUT: {
                    synchronized (mWindowMap) {
                        if (mClientFreezingScreen) {
                            mClientFreezingScreen = false;
                            mLastFinishedFreezeSource = "client-timeout";
                            stopFreezingDisplayLocked();
                        }
                    }
                    break;
                }

                case SEND_NEW_CONFIGURATION: {
                    removeMessages(SEND_NEW_CONFIGURATION);
                    sendNewConfiguration();
                    break;
                }

                case REPORT_WINDOWS_CHANGE: {
                    if (mWindowsChanged) {
                        synchronized (mWindowMap) {
                            mWindowsChanged = false;
                        }
                        notifyWindowsChanged();
                    }
                    break;
                }

                case DRAG_START_TIMEOUT: {
                    IBinder win = (IBinder)msg.obj;
                    if (DEBUG_DRAG) {
                        Slog.w(TAG, "Timeout starting drag by win " + win);
                    }
                    synchronized (mWindowMap) {
                        // !!! TODO: ANR the app that has failed to start the drag in time
                        if (mDragState != null) {
                            mDragState.unregister();
                            mInputMonitor.updateInputWindowsLw(true /*force*/);
                            mDragState.reset();
                            mDragState = null;
                        }
                    }
                    break;
                }

                case DRAG_END_TIMEOUT: {
                    IBinder win = (IBinder)msg.obj;
                    if (DEBUG_DRAG) {
                        Slog.w(TAG, "Timeout ending drag to win " + win);
                    }
                    synchronized (mWindowMap) {
                        // !!! TODO: ANR the drag-receiving app
                        if (mDragState != null) {
                            mDragState.mDragResult = false;
                            mDragState.endDragLw();
                        }
                    }
                    break;
                }

                case REPORT_HARD_KEYBOARD_STATUS_CHANGE: {
                    notifyHardKeyboardStatusChange();
                    break;
                }

                case BOOT_TIMEOUT: {
                    performBootTimeout();
                    break;
                }

                case WAITING_FOR_DRAWN_TIMEOUT: {
                    Runnable callback = null;
                    synchronized (mWindowMap) {
                        Slog.w(TAG, "Timeout waiting for drawn: undrawn=" + mWaitingForDrawn);
                        mWaitingForDrawn.clear();
                        callback = mWaitingForDrawnCallback;
                        mWaitingForDrawnCallback = null;
                    }
                    if (callback != null) {
                        callback.run();
                    }
                    break;
                }

                case SHOW_STRICT_MODE_VIOLATION: {
                    showStrictModeViolation(msg.arg1, msg.arg2);
                    break;
                }

                case SHOW_DISPLAY_MASK: {
                    showCircularMask();
                    break;
                }

                case DO_ANIMATION_CALLBACK: {
                    try {
                        ((IRemoteCallback)msg.obj).sendResult(null);
                    } catch (RemoteException e) {
                    }
                    break;
                }

                case DO_DISPLAY_ADDED:
                    handleDisplayAdded(msg.arg1);
                    break;

                case DO_DISPLAY_REMOVED:
                    synchronized (mWindowMap) {
                        handleDisplayRemovedLocked(msg.arg1);
                    }
                    break;

                case DO_DISPLAY_CHANGED:
                    synchronized (mWindowMap) {
                        handleDisplayChangedLocked(msg.arg1);
                    }
                    break;

                case TAP_OUTSIDE_STACK: {
                    int stackId;
                    synchronized (mWindowMap) {
                        stackId = ((DisplayContent)msg.obj).stackIdFromPoint(msg.arg1, msg.arg2);
                    }
                    if (stackId >= 0) {
                        try {
                            mActivityManager.setFocusedStack(stackId);
                        } catch (RemoteException e) {
                        }
                    }
                }
                break;
                case NOTIFY_ACTIVITY_DRAWN:
                    try {
                        mActivityManager.notifyActivityDrawn((IBinder) msg.obj);
                    } catch (RemoteException e) {
                    }
                    break;
                case ALL_WINDOWS_DRAWN: {
                    Runnable callback;
                    synchronized (mWindowMap) {
                        callback = mWaitingForDrawnCallback;
                        mWaitingForDrawnCallback = null;
                    }
                    if (callback != null) {
                        callback.run();
                    }
                }
                case NEW_ANIMATOR_SCALE: {
                    float scale = getCurrentAnimatorScale();
                    ValueAnimator.setDurationScale(scale);
                    Session session = (Session)msg.obj;
                    if (session != null) {
                        try {
                            session.mCallback.onAnimatorScaleChanged(scale);
                        } catch (RemoteException e) {
                        }
                    } else {
                        ArrayList<IWindowSessionCallback> callbacks
                                = new ArrayList<IWindowSessionCallback>();
                        synchronized (mWindowMap) {
                            for (int i=0; i<mSessions.size(); i++) {
                                callbacks.add(mSessions.valueAt(i).mCallback);
                            }

                        }
                        for (int i=0; i<callbacks.size(); i++) {
                            try {
                                callbacks.get(i).onAnimatorScaleChanged(scale);
                            } catch (RemoteException e) {
                            }
                        }
                    }
                }
                break;
            }
            if (DEBUG_WINDOW_TRACE) {
                Slog.v(TAG, "handleMessage: exit");
            }
        }
    }

    // -------------------------------------------------------------
    // IWindowManager API
    // -------------------------------------------------------------

    @Override
    public IWindowSession openSession(IWindowSessionCallback callback, IInputMethodClient client,
            IInputContext inputContext) {
        if (client == null) throw new IllegalArgumentException("null client");
        if (inputContext == null) throw new IllegalArgumentException("null inputContext");
        Session session = new Session(this, callback, client, inputContext);
        return session;
    }

    @Override
    public boolean inputMethodClientHasFocus(IInputMethodClient client) {
        synchronized (mWindowMap) {
            // The focus for the client is the window immediately below
            // where we would place the input method window.
            int idx = findDesiredInputMethodWindowIndexLocked(false);
            if (idx > 0) {
                // TODO(multidisplay): IMEs are only supported on the default display.
                WindowState imFocus = getDefaultWindowListLocked().get(idx-1);
                if (DEBUG_INPUT_METHOD) {
                    Slog.i(TAG, "Desired input method target: " + imFocus);
                    Slog.i(TAG, "Current focus: " + mCurrentFocus);
                    Slog.i(TAG, "Last focus: " + mLastFocus);
                }
                if (imFocus != null) {
                    // This may be a starting window, in which case we still want
                    // to count it as okay.
                    if (imFocus.mAttrs.type == LayoutParams.TYPE_APPLICATION_STARTING
                            && imFocus.mAppToken != null) {
                        // The client has definitely started, so it really should
                        // have a window in this app token.  Let's look for it.
                        for (int i=0; i<imFocus.mAppToken.windows.size(); i++) {
                            WindowState w = imFocus.mAppToken.windows.get(i);
                            if (w != imFocus) {
                                Log.i(TAG, "Switching to real app window: " + w);
                                imFocus = w;
                                break;
                            }
                        }
                    }
                    if (DEBUG_INPUT_METHOD) {
                        Slog.i(TAG, "IM target client: " + imFocus.mSession.mClient);
                        if (imFocus.mSession.mClient != null) {
                            Slog.i(TAG, "IM target client binder: "
                                    + imFocus.mSession.mClient.asBinder());
                            Slog.i(TAG, "Requesting client binder: " + client.asBinder());
                        }
                    }
                    if (imFocus.mSession.mClient != null &&
                            imFocus.mSession.mClient.asBinder() == client.asBinder()) {
                        return true;
                    }
                }
            }

            // Okay, how about this...  what is the current focus?
            // It seems in some cases we may not have moved the IM
            // target window, such as when it was in a pop-up window,
            // so let's also look at the current focus.  (An example:
            // go to Gmail, start searching so the keyboard goes up,
            // press home.  Sometimes the IME won't go down.)
            // Would be nice to fix this more correctly, but it's
            // way at the end of a release, and this should be good enough.
            if (mCurrentFocus != null && mCurrentFocus.mSession.mClient != null
                    && mCurrentFocus.mSession.mClient.asBinder() == client.asBinder()) {
                return true;
            }
        }
        return false;
    }

    @Override
    public void getInitialDisplaySize(int displayId, Point size) {
        synchronized (mWindowMap) {
            final DisplayContent displayContent = getDisplayContentLocked(displayId);
            if (displayContent != null && displayContent.hasAccess(Binder.getCallingUid())) {
                synchronized(displayContent.mDisplaySizeLock) {
                    size.x = displayContent.mInitialDisplayWidth;
                    size.y = displayContent.mInitialDisplayHeight;
                }
            }
        }
    }

    @Override
    public void getBaseDisplaySize(int displayId, Point size) {
        synchronized (mWindowMap) {
            final DisplayContent displayContent = getDisplayContentLocked(displayId);
            if (displayContent != null && displayContent.hasAccess(Binder.getCallingUid())) {
                synchronized(displayContent.mDisplaySizeLock) {
                    size.x = displayContent.mBaseDisplayWidth;
                    size.y = displayContent.mBaseDisplayHeight;
                }
            }
        }
    }

    @Override
    public void setForcedDisplaySize(int displayId, int width, int height) {
        if (mContext.checkCallingOrSelfPermission(
                android.Manifest.permission.WRITE_SECURE_SETTINGS) !=
                PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Must hold permission " +
                    android.Manifest.permission.WRITE_SECURE_SETTINGS);
        }
        if (displayId != Display.DEFAULT_DISPLAY) {
            throw new IllegalArgumentException("Can only set the default display");
        }
        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized(mWindowMap) {
                // Set some sort of reasonable bounds on the size of the display that we
                // will try to emulate.
                final int MIN_WIDTH = 200;
                final int MIN_HEIGHT = 200;
                final int MAX_SCALE = 2;
                final DisplayContent displayContent = getDisplayContentLocked(displayId);
                if (displayContent != null) {
                    width = Math.min(Math.max(width, MIN_WIDTH),
                            displayContent.mInitialDisplayWidth * MAX_SCALE);
                    height = Math.min(Math.max(height, MIN_HEIGHT),
                            displayContent.mInitialDisplayHeight * MAX_SCALE);
                    setForcedDisplaySizeLocked(displayContent, width, height);
                    Settings.Global.putString(mContext.getContentResolver(),
                            Settings.Global.DISPLAY_SIZE_FORCED, width + "," + height);
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    private void readForcedDisplaySizeAndDensityLocked(final DisplayContent displayContent) {
        String sizeStr = Settings.Global.getString(mContext.getContentResolver(),
                Settings.Global.DISPLAY_SIZE_FORCED);
        if (sizeStr == null || sizeStr.length() == 0) {
            sizeStr = SystemProperties.get(SIZE_OVERRIDE, null);
        }
        if (sizeStr != null && sizeStr.length() > 0) {
            final int pos = sizeStr.indexOf(',');
            if (pos > 0 && sizeStr.lastIndexOf(',') == pos) {
                int width, height;
                try {
                    width = Integer.parseInt(sizeStr.substring(0, pos));
                    height = Integer.parseInt(sizeStr.substring(pos+1));
                    synchronized(displayContent.mDisplaySizeLock) {
                        if (displayContent.mBaseDisplayWidth != width
                                || displayContent.mBaseDisplayHeight != height) {
                            Slog.i(TAG, "FORCED DISPLAY SIZE: " + width + "x" + height);
                            displayContent.mBaseDisplayWidth = width;
                            displayContent.mBaseDisplayHeight = height;
                        }
                    }
                } catch (NumberFormatException ex) {
                }
            }
        }
        String densityStr = Settings.Global.getString(mContext.getContentResolver(),
                Settings.Global.DISPLAY_DENSITY_FORCED);
        if (densityStr == null || densityStr.length() == 0) {
            densityStr = SystemProperties.get(DENSITY_OVERRIDE, null);
        }
        if (densityStr != null && densityStr.length() > 0) {
            int density;
            try {
                density = Integer.parseInt(densityStr);
                synchronized(displayContent.mDisplaySizeLock) {
                    if (displayContent.mBaseDisplayDensity != density) {
                        Slog.i(TAG, "FORCED DISPLAY DENSITY: " + density);
                        displayContent.mBaseDisplayDensity = density;
                    }
                }
            } catch (NumberFormatException ex) {
            }
        }
    }

    // displayContent must not be null
    private void setForcedDisplaySizeLocked(DisplayContent displayContent, int width, int height) {
        Slog.i(TAG, "Using new display size: " + width + "x" + height);

        synchronized(displayContent.mDisplaySizeLock) {
            displayContent.mBaseDisplayWidth = width;
            displayContent.mBaseDisplayHeight = height;
        }
        reconfigureDisplayLocked(displayContent);
    }

    @Override
    public void clearForcedDisplaySize(int displayId) {
        if (mContext.checkCallingOrSelfPermission(
                android.Manifest.permission.WRITE_SECURE_SETTINGS) !=
                PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Must hold permission " +
                    android.Manifest.permission.WRITE_SECURE_SETTINGS);
        }
        if (displayId != Display.DEFAULT_DISPLAY) {
            throw new IllegalArgumentException("Can only set the default display");
        }
        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized(mWindowMap) {
                final DisplayContent displayContent = getDisplayContentLocked(displayId);
                if (displayContent != null) {
                    setForcedDisplaySizeLocked(displayContent, displayContent.mInitialDisplayWidth,
                            displayContent.mInitialDisplayHeight);
                    Settings.Global.putString(mContext.getContentResolver(),
                            Settings.Global.DISPLAY_SIZE_FORCED, "");
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public int getInitialDisplayDensity(int displayId) {
        synchronized (mWindowMap) {
            final DisplayContent displayContent = getDisplayContentLocked(displayId);
            if (displayContent != null && displayContent.hasAccess(Binder.getCallingUid())) {
                synchronized(displayContent.mDisplaySizeLock) {
                    return displayContent.mInitialDisplayDensity;
                }
            }
        }
        return -1;
    }

    @Override
    public int getBaseDisplayDensity(int displayId) {
        synchronized (mWindowMap) {
            final DisplayContent displayContent = getDisplayContentLocked(displayId);
            if (displayContent != null && displayContent.hasAccess(Binder.getCallingUid())) {
                synchronized(displayContent.mDisplaySizeLock) {
                    return displayContent.mBaseDisplayDensity;
                }
            }
        }
        return -1;
    }

    @Override
    public void setForcedDisplayDensity(int displayId, int density) {
        if (mContext.checkCallingOrSelfPermission(
                android.Manifest.permission.WRITE_SECURE_SETTINGS) !=
                PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Must hold permission " +
                    android.Manifest.permission.WRITE_SECURE_SETTINGS);
        }
        if (displayId != Display.DEFAULT_DISPLAY) {
            throw new IllegalArgumentException("Can only set the default display");
        }
        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized(mWindowMap) {
                final DisplayContent displayContent = getDisplayContentLocked(displayId);
                if (displayContent != null) {
                    setForcedDisplayDensityLocked(displayContent, density);
                    Settings.Global.putString(mContext.getContentResolver(),
                            Settings.Global.DISPLAY_DENSITY_FORCED, Integer.toString(density));
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    // displayContent must not be null
    private void setForcedDisplayDensityLocked(DisplayContent displayContent, int density) {
        Slog.i(TAG, "Using new display density: " + density);

        synchronized(displayContent.mDisplaySizeLock) {
            displayContent.mBaseDisplayDensity = density;
        }
        reconfigureDisplayLocked(displayContent);
    }

    @Override
    public void clearForcedDisplayDensity(int displayId) {
        if (mContext.checkCallingOrSelfPermission(
                android.Manifest.permission.WRITE_SECURE_SETTINGS) !=
                PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Must hold permission " +
                    android.Manifest.permission.WRITE_SECURE_SETTINGS);
        }
        if (displayId != Display.DEFAULT_DISPLAY) {
            throw new IllegalArgumentException("Can only set the default display");
        }
        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized(mWindowMap) {
                final DisplayContent displayContent = getDisplayContentLocked(displayId);
                if (displayContent != null) {
                    setForcedDisplayDensityLocked(displayContent,
                            displayContent.mInitialDisplayDensity);
                    Settings.Global.putString(mContext.getContentResolver(),
                            Settings.Global.DISPLAY_DENSITY_FORCED, "");
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    // displayContent must not be null
    private void reconfigureDisplayLocked(DisplayContent displayContent) {
        // TODO: Multidisplay: for now only use with default display.
        configureDisplayPolicyLocked(displayContent);
        displayContent.layoutNeeded = true;

        boolean configChanged = updateOrientationFromAppTokensLocked(false);
        mTempConfiguration.setToDefaults();
        mTempConfiguration.fontScale = mCurConfiguration.fontScale;
        if (computeScreenConfigurationLocked(mTempConfiguration)) {
            if (mCurConfiguration.diff(mTempConfiguration) != 0) {
                configChanged = true;
            }
        }

        if (configChanged) {
            mWaitingForConfig = true;
            startFreezingDisplayLocked(false, 0, 0);
            mH.sendEmptyMessage(H.SEND_NEW_CONFIGURATION);
        }

        performLayoutAndPlaceSurfacesLocked();
    }

    private void configureDisplayPolicyLocked(DisplayContent displayContent) {
        mPolicy.setInitialDisplaySize(displayContent.getDisplay(),
                displayContent.mBaseDisplayWidth,
                displayContent.mBaseDisplayHeight,
                displayContent.mBaseDisplayDensity);

        DisplayInfo displayInfo = displayContent.getDisplayInfo();
        mPolicy.setDisplayOverscan(displayContent.getDisplay(),
                displayInfo.overscanLeft, displayInfo.overscanTop,
                displayInfo.overscanRight, displayInfo.overscanBottom);
    }

    @Override
    public void setOverscan(int displayId, int left, int top, int right, int bottom) {
        if (mContext.checkCallingOrSelfPermission(
                android.Manifest.permission.WRITE_SECURE_SETTINGS) !=
                PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Must hold permission " +
                    android.Manifest.permission.WRITE_SECURE_SETTINGS);
        }
        final long ident = Binder.clearCallingIdentity();
        try {
            synchronized(mWindowMap) {
                DisplayContent displayContent = getDisplayContentLocked(displayId);
                if (displayContent != null) {
                    setOverscanLocked(displayContent, left, top, right, bottom);
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    private void setOverscanLocked(DisplayContent displayContent,
            int left, int top, int right, int bottom) {
        final DisplayInfo displayInfo = displayContent.getDisplayInfo();
        synchronized (displayContent.mDisplaySizeLock) {
            displayInfo.overscanLeft = left;
            displayInfo.overscanTop = top;
            displayInfo.overscanRight = right;
            displayInfo.overscanBottom = bottom;
        }

        mDisplaySettings.setOverscanLocked(displayInfo.name, left, top, right, bottom);
        mDisplaySettings.writeSettingsLocked();

        reconfigureDisplayLocked(displayContent);
    }

    // -------------------------------------------------------------
    // Internals
    // -------------------------------------------------------------

    final WindowState windowForClientLocked(Session session, IWindow client,
            boolean throwOnError) {
        return windowForClientLocked(session, client.asBinder(), throwOnError);
    }

    final WindowState windowForClientLocked(Session session, IBinder client,
            boolean throwOnError) {
        WindowState win = mWindowMap.get(client);
        if (localLOGV) Slog.v(
            TAG, "Looking up client " + client + ": " + win);
        if (win == null) {
            RuntimeException ex = new IllegalArgumentException(
                    "Requested window " + client + " does not exist");
            if (throwOnError) {
                throw ex;
            }
            Slog.w(TAG, "Failed looking up window", ex);
            return null;
        }
        if (session != null && win.mSession != session) {
            RuntimeException ex = new IllegalArgumentException(
                    "Requested window " + client + " is in session " +
                    win.mSession + ", not " + session);
            if (throwOnError) {
                throw ex;
            }
            Slog.w(TAG, "Failed looking up window", ex);
            return null;
        }

        return win;
    }

    final void rebuildAppWindowListLocked() {
        rebuildAppWindowListLocked(getDefaultDisplayContentLocked());
    }

    private void rebuildAppWindowListLocked(final DisplayContent displayContent) {
        final WindowList windows = displayContent.getWindowList();
        int NW = windows.size();
        int i;
        int lastBelow = -1;
        int numRemoved = 0;

        if (mRebuildTmp.length < NW) {
            mRebuildTmp = new WindowState[NW+10];
        }

        // First remove all existing app windows.
        i=0;
        while (i < NW) {
            WindowState w = windows.get(i);
            if (w.mAppToken != null) {
                WindowState win = windows.remove(i);
                win.mRebuilding = true;
                mRebuildTmp[numRemoved] = win;
                mWindowsChanged = true;
                if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "Rebuild removing window: " + win);
                NW--;
                numRemoved++;
                continue;
            } else if (lastBelow == i-1) {
                if (w.mAttrs.type == TYPE_WALLPAPER || w.mAttrs.type == TYPE_UNIVERSE_BACKGROUND) {
                    lastBelow = i;
                }
            }
            i++;
        }

        // Keep whatever windows were below the app windows still below,
        // by skipping them.
        lastBelow++;
        i = lastBelow;

        // First add all of the exiting app tokens...  these are no longer
        // in the main app list, but still have windows shown.  We put them
        // in the back because now that the animation is over we no longer
        // will care about them.
        final ArrayList<TaskStack> stacks = displayContent.getStacks();
        final int numStacks = stacks.size();
        for (int stackNdx = 0; stackNdx < numStacks; ++stackNdx) {
            AppTokenList exitingAppTokens = stacks.get(stackNdx).mExitingAppTokens;
            int NT = exitingAppTokens.size();
            for (int j = 0; j < NT; j++) {
                i = reAddAppWindowsLocked(displayContent, i, exitingAppTokens.get(j));
            }
        }

        // And add in the still active app tokens in Z order.
        for (int stackNdx = 0; stackNdx < numStacks; ++stackNdx) {
            final ArrayList<Task> tasks = stacks.get(stackNdx).getTasks();
            final int numTasks = tasks.size();
            for (int taskNdx = 0; taskNdx < numTasks; ++taskNdx) {
                final AppTokenList tokens = tasks.get(taskNdx).mAppTokens;
                final int numTokens = tokens.size();
                for (int tokenNdx = 0; tokenNdx < numTokens; ++tokenNdx) {
                    final AppWindowToken wtoken = tokens.get(tokenNdx);
                    if (wtoken.mDeferRemoval) {
                        continue;
                    }
                    i = reAddAppWindowsLocked(displayContent, i, wtoken);
                }
            }
        }

        i -= lastBelow;
        if (i != numRemoved) {
            Slog.w(TAG, "On display=" + displayContent.getDisplayId() + " Rebuild removed " +
                    numRemoved + " windows but added " + i,
                    new RuntimeException("here").fillInStackTrace());
            for (i=0; i<numRemoved; i++) {
                WindowState ws = mRebuildTmp[i];
                if (ws.mRebuilding) {
                    StringWriter sw = new StringWriter();
                    PrintWriter pw = new FastPrintWriter(sw, false, 1024);
                    ws.dump(pw, "", true);
                    pw.flush();
                    Slog.w(TAG, "This window was lost: " + ws);
                    Slog.w(TAG, sw.toString());
                    ws.mWinAnimator.destroySurfaceLocked();
                }
            }
            Slog.w(TAG, "Current app token list:");
            dumpAppTokensLocked();
            Slog.w(TAG, "Final window list:");
            dumpWindowsLocked();
        }
    }

    private final void assignLayersLocked(WindowList windows) {
        int N = windows.size();
        int curBaseLayer = 0;
        int curLayer = 0;
        int i;

        if (DEBUG_LAYERS) Slog.v(TAG, "Assigning layers based on windows=" + windows,
                new RuntimeException("here").fillInStackTrace());

        boolean anyLayerChanged = false;

        for (i=0; i<N; i++) {
            final WindowState w = windows.get(i);
            final WindowStateAnimator winAnimator = w.mWinAnimator;
            boolean layerChanged = false;
            int oldLayer = w.mLayer;
            if (w.mBaseLayer == curBaseLayer || w.mIsImWindow
                    || (i > 0 && w.mIsWallpaper)) {
                curLayer += WINDOW_LAYER_MULTIPLIER;
                w.mLayer = curLayer;
            } else {
                curBaseLayer = curLayer = w.mBaseLayer;
                w.mLayer = curLayer;
            }
            if (w.mLayer != oldLayer) {
                layerChanged = true;
                anyLayerChanged = true;
            }
            final AppWindowToken wtoken = w.mAppToken;
            oldLayer = winAnimator.mAnimLayer;
            if (w.mTargetAppToken != null) {
                winAnimator.mAnimLayer =
                        w.mLayer + w.mTargetAppToken.mAppAnimator.animLayerAdjustment;
            } else if (wtoken != null) {
                winAnimator.mAnimLayer =
                        w.mLayer + wtoken.mAppAnimator.animLayerAdjustment;
            } else {
                winAnimator.mAnimLayer = w.mLayer;
            }
            if (w.mIsImWindow) {
                winAnimator.mAnimLayer += mInputMethodAnimLayerAdjustment;
            } else if (w.mIsWallpaper) {
                winAnimator.mAnimLayer += mWallpaperAnimLayerAdjustment;
            }
            if (winAnimator.mAnimLayer != oldLayer) {
                layerChanged = true;
                anyLayerChanged = true;
            }
            if (layerChanged && w.getStack().isDimming(winAnimator)) {
                // Force an animation pass just to update the mDimLayer layer.
                scheduleAnimationLocked();
            }
            if (DEBUG_LAYERS) Slog.v(TAG, "Assign layer " + w + ": "
                    + "mBase=" + w.mBaseLayer
                    + " mLayer=" + w.mLayer
                    + (wtoken == null ?
                            "" : " mAppLayer=" + wtoken.mAppAnimator.animLayerAdjustment)
                    + " =mAnimLayer=" + winAnimator.mAnimLayer);
            //System.out.println(
            //    "Assigned layer " + curLayer + " to " + w.mClient.asBinder());
        }

        //TODO (multidisplay): Magnification is supported only for the default display.
        if (mAccessibilityController != null && anyLayerChanged
                && windows.get(windows.size() - 1).getDisplayId() == Display.DEFAULT_DISPLAY) {
            mAccessibilityController.onWindowLayersChangedLocked();
        }
    }

    private final void performLayoutAndPlaceSurfacesLocked() {
        int loopCount = 6;
        do {
            mTraversalScheduled = false;
            performLayoutAndPlaceSurfacesLockedLoop();
            mH.removeMessages(H.DO_TRAVERSAL);
            loopCount--;
        } while (mTraversalScheduled && loopCount > 0);
        mInnerFields.mWallpaperActionPending = false;
    }

    private boolean mInLayout = false;
    private final void performLayoutAndPlaceSurfacesLockedLoop() {
        if (mInLayout) {
            if (DEBUG) {
                throw new RuntimeException("Recursive call!");
            }
            Slog.w(TAG, "performLayoutAndPlaceSurfacesLocked called while in layout. Callers="
                    + Debug.getCallers(3));
            return;
        }

        if (mWaitingForConfig) {
            // Our configuration has changed (most likely rotation), but we
            // don't yet have the complete configuration to report to
            // applications.  Don't do any window layout until we have it.
            return;
        }

        if (!mDisplayReady) {
            // Not yet initialized, nothing to do.
            return;
        }

        Trace.traceBegin(Trace.TRACE_TAG_WINDOW_MANAGER, "wmLayout");
        mInLayout = true;
        boolean recoveringMemory = false;

        try {
            if (mForceRemoves != null) {
                recoveringMemory = true;
                // Wait a little bit for things to settle down, and off we go.
                for (int i=0; i<mForceRemoves.size(); i++) {
                    WindowState ws = mForceRemoves.get(i);
                    Slog.i(TAG, "Force removing: " + ws);
                    removeWindowInnerLocked(ws.mSession, ws);
                }
                mForceRemoves = null;
                Slog.w(TAG, "Due to memory failure, waiting a bit for next layout");
                Object tmp = new Object();
                synchronized (tmp) {
                    try {
                        tmp.wait(250);
                    } catch (InterruptedException e) {
                    }
                }
            }
        } catch (RuntimeException e) {
            Log.wtf(TAG, "Unhandled exception while force removing for memory", e);
        }

        try {
            performLayoutAndPlaceSurfacesLockedInner(recoveringMemory);

            mInLayout = false;

            if (needsLayout()) {
                if (++mLayoutRepeatCount < 6) {
                    requestTraversalLocked();
                } else {
                    Slog.e(TAG, "Performed 6 layouts in a row. Skipping");
                    mLayoutRepeatCount = 0;
                }
            } else {
                mLayoutRepeatCount = 0;
            }

            if (mWindowsChanged && !mWindowChangeListeners.isEmpty()) {
                mH.removeMessages(H.REPORT_WINDOWS_CHANGE);
                mH.sendEmptyMessage(H.REPORT_WINDOWS_CHANGE);
            }
        } catch (RuntimeException e) {
            mInLayout = false;
            Log.wtf(TAG, "Unhandled exception while laying out windows", e);
        }

        Trace.traceEnd(Trace.TRACE_TAG_WINDOW_MANAGER);
    }

    private final void performLayoutLockedInner(final DisplayContent displayContent,
                                    boolean initial, boolean updateInputWindows) {
        if (!displayContent.layoutNeeded) {
            return;
        }
        displayContent.layoutNeeded = false;
        WindowList windows = displayContent.getWindowList();
        boolean isDefaultDisplay = displayContent.isDefaultDisplay;

        DisplayInfo displayInfo = displayContent.getDisplayInfo();
        final int dw = displayInfo.logicalWidth;
        final int dh = displayInfo.logicalHeight;

        final int NFW = mFakeWindows.size();
        for (int i=0; i<NFW; i++) {
            mFakeWindows.get(i).layout(dw, dh);
        }

        final int N = windows.size();
        int i;

        if (DEBUG_LAYOUT) {
            Slog.v(TAG, "-------------------------------------");
            Slog.v(TAG, "performLayout: needed="
                    + displayContent.layoutNeeded + " dw=" + dw + " dh=" + dh);
        }

        WindowStateAnimator universeBackground = null;

        mPolicy.beginLayoutLw(isDefaultDisplay, dw, dh, mRotation);
        if (isDefaultDisplay) {
            // Not needed on non-default displays.
            mSystemDecorLayer = mPolicy.getSystemDecorLayerLw();
            mScreenRect.set(0, 0, dw, dh);
        }

        mPolicy.getContentRectLw(mTmpContentRect);
        displayContent.resize(mTmpContentRect);

        int seq = mLayoutSeq+1;
        if (seq < 0) seq = 0;
        mLayoutSeq = seq;

        boolean behindDream = false;

        // First perform layout of any root windows (not attached
        // to another window).
        int topAttached = -1;
        for (i = N-1; i >= 0; i--) {
            final WindowState win = windows.get(i);

            // Don't do layout of a window if it is not visible, or
            // soon won't be visible, to avoid wasting time and funky
            // changes while a window is animating away.
            final boolean gone = (behindDream && mPolicy.canBeForceHidden(win, win.mAttrs))
                    || win.isGoneForLayoutLw();

            if (DEBUG_LAYOUT && !win.mLayoutAttached) {
                Slog.v(TAG, "1ST PASS " + win
                        + ": gone=" + gone + " mHaveFrame=" + win.mHaveFrame
                        + " mLayoutAttached=" + win.mLayoutAttached
                        + " screen changed=" + win.isConfigChanged());
                final AppWindowToken atoken = win.mAppToken;
                if (gone) Slog.v(TAG, "  GONE: mViewVisibility="
                        + win.mViewVisibility + " mRelayoutCalled="
                        + win.mRelayoutCalled + " hidden="
                        + win.mRootToken.hidden + " hiddenRequested="
                        + (atoken != null && atoken.hiddenRequested)
                        + " mAttachedHidden=" + win.mAttachedHidden);
                else Slog.v(TAG, "  VIS: mViewVisibility="
                        + win.mViewVisibility + " mRelayoutCalled="
                        + win.mRelayoutCalled + " hidden="
                        + win.mRootToken.hidden + " hiddenRequested="
                        + (atoken != null && atoken.hiddenRequested)
                        + " mAttachedHidden=" + win.mAttachedHidden);
            }

            // If this view is GONE, then skip it -- keep the current
            // frame, and let the caller know so they can ignore it
            // if they want.  (We do the normal layout for INVISIBLE
            // windows, since that means "perform layout as normal,
            // just don't display").
            if (!gone || !win.mHaveFrame || win.mLayoutNeeded
                    || ((win.isConfigChanged() || win.setInsetsChanged()) &&
                            ((win.mAttrs.privateFlags & PRIVATE_FLAG_KEYGUARD) != 0 ||
                            win.mAppToken != null && win.mAppToken.layoutConfigChanges))
                    || win.mAttrs.type == TYPE_UNIVERSE_BACKGROUND) {
                if (!win.mLayoutAttached) {
                    if (initial) {
                        //Slog.i(TAG, "Window " + this + " clearing mContentChanged - initial");
                        win.mContentChanged = false;
                    }
                    if (win.mAttrs.type == TYPE_DREAM) {
                        // Don't layout windows behind a dream, so that if it
                        // does stuff like hide the status bar we won't get a
                        // bad transition when it goes away.
                        behindDream = true;
                    }
                    win.mLayoutNeeded = false;
                    win.prelayout();
                    mPolicy.layoutWindowLw(win, null);
                    win.mLayoutSeq = seq;
                    if (DEBUG_LAYOUT) Slog.v(TAG, "  LAYOUT: mFrame="
                            + win.mFrame + " mContainingFrame="
                            + win.mContainingFrame + " mDisplayFrame="
                            + win.mDisplayFrame);
                } else {
                    if (topAttached < 0) topAttached = i;
                }
            }
            if (win.mViewVisibility == View.VISIBLE
                    && win.mAttrs.type == TYPE_UNIVERSE_BACKGROUND
                    && universeBackground == null) {
                universeBackground = win.mWinAnimator;
            }
        }

        if (mAnimator.mUniverseBackground  != universeBackground) {
            mFocusMayChange = true;
            mAnimator.mUniverseBackground = universeBackground;
        }

        boolean attachedBehindDream = false;

        // Now perform layout of attached windows, which usually
        // depend on the position of the window they are attached to.
        // XXX does not deal with windows that are attached to windows
        // that are themselves attached.
        for (i = topAttached; i >= 0; i--) {
            final WindowState win = windows.get(i);

            if (win.mLayoutAttached) {
                if (DEBUG_LAYOUT) Slog.v(TAG, "2ND PASS " + win
                        + " mHaveFrame=" + win.mHaveFrame
                        + " mViewVisibility=" + win.mViewVisibility
                        + " mRelayoutCalled=" + win.mRelayoutCalled);
                // If this view is GONE, then skip it -- keep the current
                // frame, and let the caller know so they can ignore it
                // if they want.  (We do the normal layout for INVISIBLE
                // windows, since that means "perform layout as normal,
                // just don't display").
                if (attachedBehindDream && mPolicy.canBeForceHidden(win, win.mAttrs)) {
                    continue;
                }
                if ((win.mViewVisibility != View.GONE && win.mRelayoutCalled)
                        || !win.mHaveFrame || win.mLayoutNeeded) {
                    if (initial) {
                        //Slog.i(TAG, "Window " + this + " clearing mContentChanged - initial");
                        win.mContentChanged = false;
                    }
                    win.mLayoutNeeded = false;
                    win.prelayout();
                    mPolicy.layoutWindowLw(win, win.mAttachedWindow);
                    win.mLayoutSeq = seq;
                    if (DEBUG_LAYOUT) Slog.v(TAG, "  LAYOUT: mFrame="
                            + win.mFrame + " mContainingFrame="
                            + win.mContainingFrame + " mDisplayFrame="
                            + win.mDisplayFrame);
                }
            } else if (win.mAttrs.type == TYPE_DREAM) {
                // Don't layout windows behind a dream, so that if it
                // does stuff like hide the status bar we won't get a
                // bad transition when it goes away.
                attachedBehindDream = behindDream;
            }
        }

        // Window frames may have changed.  Tell the input dispatcher about it.
        mInputMonitor.setUpdateInputWindowsNeededLw();
        if (updateInputWindows) {
            mInputMonitor.updateInputWindowsLw(false /*force*/);
        }

        mPolicy.finishLayoutLw();
    }

    void makeWindowFreezingScreenIfNeededLocked(WindowState w) {
        // If the screen is currently frozen or off, then keep
        // it frozen/off until this window draws at its new
        // orientation.
        if (!okToDisplay()) {
            if (DEBUG_ORIENTATION) Slog.v(TAG, "Changing surface while display frozen: " + w);
            w.mOrientationChanging = true;
            w.mLastFreezeDuration = 0;
            mInnerFields.mOrientationChangeComplete = false;
            if (!mWindowsFreezingScreen) {
                mWindowsFreezingScreen = true;
                // XXX should probably keep timeout from
                // when we first froze the display.
                mH.removeMessages(H.WINDOW_FREEZE_TIMEOUT);
                mH.sendEmptyMessageDelayed(H.WINDOW_FREEZE_TIMEOUT,
                        WINDOW_FREEZE_TIMEOUT_DURATION);
            }
        }
    }

    /**
     * Extracted from {@link #performLayoutAndPlaceSurfacesLockedInner} to reduce size of method.
     * @param windows List of windows on default display.
     * @return bitmap indicating if another pass through layout must be made.
     */
    public int handleAppTransitionReadyLocked(WindowList windows) {
        int changes = 0;
        int i;
        int NN = mOpeningApps.size();
        boolean goodToGo = true;
        if (DEBUG_APP_TRANSITIONS) Slog.v(TAG,
                "Checking " + NN + " opening apps (frozen="
                + mDisplayFrozen + " timeout="
                + mAppTransition.isTimeout() + ")...");
        if (!mDisplayFrozen && !mAppTransition.isTimeout()) {
            // If the display isn't frozen, wait to do anything until
            // all of the apps are ready.  Otherwise just go because
            // we'll unfreeze the display when everyone is ready.
            for (i=0; i<NN && goodToGo; i++) {
                AppWindowToken wtoken = mOpeningApps.valueAt(i);
                if (DEBUG_APP_TRANSITIONS) Slog.v(TAG,
                        "Check opening app=" + wtoken + ": allDrawn="
                        + wtoken.allDrawn + " startingDisplayed="
                        + wtoken.startingDisplayed + " startingMoved="
                        + wtoken.startingMoved);
                if (!wtoken.allDrawn && !wtoken.startingDisplayed
                        && !wtoken.startingMoved) {
                    goodToGo = false;
                }
            }
        }
        if (goodToGo) {
            if (DEBUG_APP_TRANSITIONS) Slog.v(TAG, "**** GOOD TO GO");
            int transit = mAppTransition.getAppTransition();
            if (mSkipAppTransitionAnimation) {
                transit = AppTransition.TRANSIT_UNSET;
            }
            mAppTransition.goodToGo();
            mStartingIconInTransition = false;
            mSkipAppTransitionAnimation = false;

            mH.removeMessages(H.APP_TRANSITION_TIMEOUT);

            rebuildAppWindowListLocked();

            // if wallpaper is animating in or out set oldWallpaper to null else to wallpaper
            WindowState oldWallpaper =
                    mWallpaperTarget != null && mWallpaperTarget.mWinAnimator.isAnimating()
                        && !mWallpaperTarget.mWinAnimator.isDummyAnimation()
                    ? null : mWallpaperTarget;

            mInnerFields.mWallpaperMayChange = false;

            // The top-most window will supply the layout params,
            // and we will determine it below.
            LayoutParams animLp = null;
            int bestAnimLayer = -1;
            boolean fullscreenAnim = false;
            boolean voiceInteraction = false;

            if (DEBUG_APP_TRANSITIONS) Slog.v(TAG,
                    "New wallpaper target=" + mWallpaperTarget
                    + ", oldWallpaper=" + oldWallpaper
                    + ", lower target=" + mLowerWallpaperTarget
                    + ", upper target=" + mUpperWallpaperTarget);

            boolean openingAppHasWallpaper = false;
            boolean closingAppHasWallpaper = false;
            final AppWindowToken lowerWallpaperAppToken;
            final AppWindowToken upperWallpaperAppToken;
            if (mLowerWallpaperTarget == null) {
                lowerWallpaperAppToken = upperWallpaperAppToken = null;
            } else {
                lowerWallpaperAppToken = mLowerWallpaperTarget.mAppToken;
                upperWallpaperAppToken = mUpperWallpaperTarget.mAppToken;
            }

            // Do a first pass through the tokens for two
            // things:
            // (1) Determine if both the closing and opening
            // app token sets are wallpaper targets, in which
            // case special animations are needed
            // (since the wallpaper needs to stay static
            // behind them).
            // (2) Find the layout params of the top-most
            // application window in the tokens, which is
            // what will control the animation theme.
            final int NC = mClosingApps.size();
            NN = NC + mOpeningApps.size();
            for (i=0; i<NN; i++) {
                final AppWindowToken wtoken;
                if (i < NC) {
                    wtoken = mClosingApps.valueAt(i);
                    if (wtoken == lowerWallpaperAppToken || wtoken == upperWallpaperAppToken) {
                        closingAppHasWallpaper = true;
                    }
                } else {
                    wtoken = mOpeningApps.valueAt(i - NC);
                    if (wtoken == lowerWallpaperAppToken || wtoken == upperWallpaperAppToken) {
                        openingAppHasWallpaper = true;
                    }
                }

                voiceInteraction |= wtoken.voiceInteraction;

                if (wtoken.appFullscreen) {
                    WindowState ws = wtoken.findMainWindow();
                    if (ws != null) {
                        animLp = ws.mAttrs;
                        bestAnimLayer = ws.mLayer;
                        fullscreenAnim = true;
                    }
                } else if (!fullscreenAnim) {
                    WindowState ws = wtoken.findMainWindow();
                    if (ws != null) {
                        if (ws.mLayer > bestAnimLayer) {
                            animLp = ws.mAttrs;
                            bestAnimLayer = ws.mLayer;
                        }
                    }
                }
            }

            mAnimateWallpaperWithTarget = false;
            if (closingAppHasWallpaper && openingAppHasWallpaper) {
                if (DEBUG_APP_TRANSITIONS) Slog.v(TAG, "Wallpaper animation!");
                switch (transit) {
                    case AppTransition.TRANSIT_ACTIVITY_OPEN:
                    case AppTransition.TRANSIT_TASK_OPEN:
                    case AppTransition.TRANSIT_TASK_TO_FRONT:
                        transit = AppTransition.TRANSIT_WALLPAPER_INTRA_OPEN;
                        break;
                    case AppTransition.TRANSIT_ACTIVITY_CLOSE:
                    case AppTransition.TRANSIT_TASK_CLOSE:
                    case AppTransition.TRANSIT_TASK_TO_BACK:
                        transit = AppTransition.TRANSIT_WALLPAPER_INTRA_CLOSE;
                        break;
                }
                if (DEBUG_APP_TRANSITIONS) Slog.v(TAG, "New transit: " + transit);
            } else if ((oldWallpaper != null) && !mOpeningApps.isEmpty()
                    && !mOpeningApps.contains(oldWallpaper.mAppToken)) {
                // We are transitioning from an activity with
                // a wallpaper to one without.
                transit = AppTransition.TRANSIT_WALLPAPER_CLOSE;
                if (DEBUG_APP_TRANSITIONS) Slog.v(TAG,
                        "New transit away from wallpaper: " + transit);
            } else if (mWallpaperTarget != null && mWallpaperTarget.isVisibleLw()) {
                // We are transitioning from an activity without
                // a wallpaper to now showing the wallpaper
                transit = AppTransition.TRANSIT_WALLPAPER_OPEN;
                if (DEBUG_APP_TRANSITIONS) Slog.v(TAG,
                        "New transit into wallpaper: " + transit);
            } else {
                mAnimateWallpaperWithTarget = true;
            }

            // If all closing windows are obscured, then there is
            // no need to do an animation.  This is the case, for
            // example, when this transition is being done behind
            // the lock screen.
            if (!mPolicy.allowAppAnimationsLw()) {
                if (DEBUG_APP_TRANSITIONS) Slog.v(TAG,
                        "Animations disallowed by keyguard or dream.");
                animLp = null;
            }

            AppWindowToken topOpeningApp = null;
            AppWindowToken topClosingApp = null;
            int topOpeningLayer = 0;
            int topClosingLayer = 0;

            NN = mOpeningApps.size();
            for (i=0; i<NN; i++) {
                AppWindowToken wtoken = mOpeningApps.valueAt(i);
                final AppWindowAnimator appAnimator = wtoken.mAppAnimator;
                if (DEBUG_APP_TRANSITIONS) Slog.v(TAG, "Now opening app" + wtoken);
                appAnimator.clearThumbnail();
                appAnimator.animation = null;
                wtoken.inPendingTransaction = false;
                setTokenVisibilityLocked(wtoken, animLp, true, transit, false, voiceInteraction);
                wtoken.updateReportedVisibilityLocked();
                wtoken.waitingToShow = false;

                appAnimator.mAllAppWinAnimators.clear();
                final int N = wtoken.allAppWindows.size();
                for (int j = 0; j < N; j++) {
                    appAnimator.mAllAppWinAnimators.add(wtoken.allAppWindows.get(j).mWinAnimator);
                }
                mAnimator.mAnimating |= appAnimator.showAllWindowsLocked();

                if (animLp != null) {
                    int layer = -1;
                    for (int j=0; j<wtoken.windows.size(); j++) {
                        WindowState win = wtoken.windows.get(j);
                        if (win.mWinAnimator.mAnimLayer > layer) {
                            layer = win.mWinAnimator.mAnimLayer;
                        }
                    }
                    if (topOpeningApp == null || layer > topOpeningLayer) {
                        topOpeningApp = wtoken;
                        topOpeningLayer = layer;
                    }
                }
            }
            NN = mClosingApps.size();
            for (i=0; i<NN; i++) {
                AppWindowToken wtoken = mClosingApps.valueAt(i);
                final AppWindowAnimator appAnimator = wtoken.mAppAnimator;
                if (DEBUG_APP_TRANSITIONS) Slog.v(TAG, "Now closing app " + wtoken);
                appAnimator.clearThumbnail();
                appAnimator.animation = null;
                wtoken.inPendingTransaction = false;
                setTokenVisibilityLocked(wtoken, animLp, false, transit, false, voiceInteraction);
                wtoken.updateReportedVisibilityLocked();
                wtoken.waitingToHide = false;
                // Force the allDrawn flag, because we want to start
                // this guy's animations regardless of whether it's
                // gotten drawn.
                wtoken.allDrawn = true;
                wtoken.deferClearAllDrawn = false;

                if (animLp != null) {
                    int layer = -1;
                    for (int j=0; j<wtoken.windows.size(); j++) {
                        WindowState win = wtoken.windows.get(j);
                        if (win.mWinAnimator.mAnimLayer > layer) {
                            layer = win.mWinAnimator.mAnimLayer;
                        }
                    }
                    if (topClosingApp == null || layer > topClosingLayer) {
                        topClosingApp = wtoken;
                        topClosingLayer = layer;
                    }
                }
            }

            AppWindowAnimator openingAppAnimator = (topOpeningApp == null) ? null :
                    topOpeningApp.mAppAnimator;
            AppWindowAnimator closingAppAnimator = (topClosingApp == null) ? null :
                    topClosingApp.mAppAnimator;
            Bitmap nextAppTransitionThumbnail = mAppTransition.getNextAppTransitionThumbnail();
            if (nextAppTransitionThumbnail != null
                    && openingAppAnimator != null && openingAppAnimator.animation != null &&
                    nextAppTransitionThumbnail.getConfig() != Config.ALPHA_8) {
                // This thumbnail animation is very special, we need to have
                // an extra surface with the thumbnail included with the animation.
                Rect dirty = new Rect(0, 0, nextAppTransitionThumbnail.getWidth(),
                        nextAppTransitionThumbnail.getHeight());
                try {
                    // TODO(multi-display): support other displays
                    final DisplayContent displayContent = getDefaultDisplayContentLocked();
                    final Display display = displayContent.getDisplay();
                    final DisplayInfo displayInfo = displayContent.getDisplayInfo();

                    // Create a new surface for the thumbnail
                    SurfaceControl surfaceControl = new SurfaceControl(mFxSession,
                            "thumbnail anim", dirty.width(), dirty.height(),
                            PixelFormat.TRANSLUCENT, SurfaceControl.HIDDEN);
                    surfaceControl.setLayerStack(display.getLayerStack());
                    if (SHOW_TRANSACTIONS) {
                        Slog.i(TAG, "  THUMBNAIL " + surfaceControl + ": CREATE");
                    }

                    // Draw the thumbnail onto the surface
                    Surface drawSurface = new Surface();
                    drawSurface.copyFrom(surfaceControl);
                    Canvas c = drawSurface.lockCanvas(dirty);
                    c.drawBitmap(nextAppTransitionThumbnail, 0, 0, null);
                    drawSurface.unlockCanvasAndPost(c);
                    drawSurface.release();

                    // Get the thumbnail animation
                    Animation anim;
                    if (mAppTransition.isNextThumbnailTransitionAspectScaled()) {
                        // For the new aspect-scaled transition, we want it to always show
                        // above the animating opening/closing window, and we want to
                        // synchronize its thumbnail surface with the surface for the
                        // open/close animation (only on the way down)
                        anim = mAppTransition.createThumbnailAspectScaleAnimationLocked(
                                displayInfo.appWidth, displayInfo.appHeight,
                                displayInfo.logicalWidth, transit);
                        openingAppAnimator.thumbnailForceAboveLayer = Math.max(topOpeningLayer,
                                topClosingLayer);
                        openingAppAnimator.deferThumbnailDestruction =
                                !mAppTransition.isNextThumbnailTransitionScaleUp();
                        if (openingAppAnimator.deferThumbnailDestruction) {
                            if (closingAppAnimator != null &&
                                    closingAppAnimator.animation != null) {
                                closingAppAnimator.deferredThumbnail = surfaceControl;
                            }
                        }
                    } else {
                        anim = mAppTransition.createThumbnailScaleAnimationLocked(
                                displayInfo.appWidth, displayInfo.appHeight, transit);
                    }
                    anim.restrictDuration(MAX_ANIMATION_DURATION);
                    anim.scaleCurrentDuration(getTransitionAnimationScaleLocked());

                    openingAppAnimator.thumbnail = surfaceControl;
                    openingAppAnimator.thumbnailLayer = topOpeningLayer;
                    openingAppAnimator.thumbnailAnimation = anim;
                    openingAppAnimator.thumbnailX = mAppTransition.getStartingX();
                    openingAppAnimator.thumbnailY = mAppTransition.getStartingY();
                } catch (OutOfResourcesException e) {
                    Slog.e(TAG, "Can't allocate thumbnail/Canvas surface w=" + dirty.width()
                            + " h=" + dirty.height(), e);
                    openingAppAnimator.clearThumbnail();
                }
            }

            mAppTransition.postAnimationCallback();
            mAppTransition.clear();

            mOpeningApps.clear();
            mClosingApps.clear();

            // This has changed the visibility of windows, so perform
            // a new layout to get them all up-to-date.
            changes |= WindowManagerPolicy.FINISH_LAYOUT_REDO_LAYOUT
                    | WindowManagerPolicy.FINISH_LAYOUT_REDO_CONFIG;
            getDefaultDisplayContentLocked().layoutNeeded = true;

            // TODO(multidisplay): IMEs are only supported on the default display.
            if (windows == getDefaultWindowListLocked()
                    && !moveInputMethodWindowsIfNeededLocked(true)) {
                assignLayersLocked(windows);
            }
            updateFocusedWindowLocked(UPDATE_FOCUS_PLACING_SURFACES, true /*updateInputWindows*/);
            mFocusMayChange = false;
        }

        return changes;
    }

    /**
     * Extracted from {@link #performLayoutAndPlaceSurfacesLockedInner} to reduce size of method.
     * @return bitmap indicating if another pass through layout must be made.
     */
    private int handleAnimatingStoppedAndTransitionLocked() {
        int changes = 0;

        mAppTransition.setIdle();
        // Restore window app tokens to the ActivityManager views
        ArrayList<TaskStack> stacks = getDefaultDisplayContentLocked().getStacks();
        for (int stackNdx = stacks.size() - 1; stackNdx >= 0; --stackNdx) {
            final ArrayList<Task> tasks = stacks.get(stackNdx).getTasks();
            for (int taskNdx = tasks.size() - 1; taskNdx >= 0; --taskNdx) {
                final AppTokenList tokens = tasks.get(taskNdx).mAppTokens;
                for (int tokenNdx = tokens.size() - 1; tokenNdx >= 0; --tokenNdx) {
                    tokens.get(tokenNdx).sendingToBottom = false;
                }
            }
        }
        rebuildAppWindowListLocked();

        changes |= PhoneWindowManager.FINISH_LAYOUT_REDO_LAYOUT;
        if (DEBUG_WALLPAPER_LIGHT) Slog.v(TAG,
                "Wallpaper layer changed: assigning layers + relayout");
        moveInputMethodWindowsIfNeededLocked(true);
        mInnerFields.mWallpaperMayChange = true;
        // Since the window list has been rebuilt, focus might
        // have to be recomputed since the actual order of windows
        // might have changed again.
        mFocusMayChange = true;

        return changes;
    }

    private void updateResizingWindows(final WindowState w) {
        final WindowStateAnimator winAnimator = w.mWinAnimator;
        if (w.mHasSurface && w.mLayoutSeq == mLayoutSeq) {
            w.setInsetsChanged();
            boolean configChanged = w.isConfigChanged();
            if (DEBUG_CONFIGURATION && configChanged) {
                Slog.v(TAG, "Win " + w + " config changed: "
                        + mCurConfiguration);
            }
            if (localLOGV) Slog.v(TAG, "Resizing " + w
                    + ": configChanged=" + configChanged
                    + " last=" + w.mLastFrame + " frame=" + w.mFrame);
            w.mLastFrame.set(w.mFrame);
            if (w.mContentInsetsChanged
                    || w.mVisibleInsetsChanged
                    || winAnimator.mSurfaceResized
                    || configChanged) {
                if (DEBUG_RESIZE || DEBUG_ORIENTATION) {
                    Slog.v(TAG, "Resize reasons for w=" + w + ": "
                            + " contentInsetsChanged=" + w.mContentInsetsChanged
                            + " " + w.mContentInsets.toShortString()
                            + " visibleInsetsChanged=" + w.mVisibleInsetsChanged
                            + " " + w.mVisibleInsets.toShortString()
                            + " stableInsetsChanged=" + w.mStableInsetsChanged
                            + " " + w.mStableInsets.toShortString()
                            + " surfaceResized=" + winAnimator.mSurfaceResized
                            + " configChanged=" + configChanged);
                }

                w.mLastOverscanInsets.set(w.mOverscanInsets);
                w.mLastContentInsets.set(w.mContentInsets);
                w.mLastVisibleInsets.set(w.mVisibleInsets);
                w.mLastStableInsets.set(w.mStableInsets);
                makeWindowFreezingScreenIfNeededLocked(w);
                // If the orientation is changing, then we need to
                // hold off on unfreezing the display until this
                // window has been redrawn; to do that, we need
                // to go through the process of getting informed
                // by the application when it has finished drawing.
                if (w.mOrientationChanging) {
                    if (DEBUG_SURFACE_TRACE || DEBUG_ANIM || DEBUG_ORIENTATION) Slog.v(TAG,
                            "Orientation start waiting for draw mDrawState=DRAW_PENDING in "
                            + w + ", surface " + winAnimator.mSurfaceControl);
                    winAnimator.mDrawState = WindowStateAnimator.DRAW_PENDING;
                    if (w.mAppToken != null) {
                        w.mAppToken.allDrawn = false;
                        w.mAppToken.deferClearAllDrawn = false;
                    }
                }
                if (!mResizingWindows.contains(w)) {
                    if (DEBUG_RESIZE || DEBUG_ORIENTATION) Slog.v(TAG,
                            "Resizing window " + w + " to " + winAnimator.mSurfaceW
                            + "x" + winAnimator.mSurfaceH);
                    mResizingWindows.add(w);
                }
            } else if (w.mOrientationChanging) {
                if (w.isDrawnLw()) {
                    if (DEBUG_ORIENTATION) Slog.v(TAG,
                            "Orientation not waiting for draw in "
                            + w + ", surface " + winAnimator.mSurfaceControl);
                    w.mOrientationChanging = false;
                    w.mLastFreezeDuration = (int)(SystemClock.elapsedRealtime()
                            - mDisplayFreezeTime);
                }
            }
        }
    }

    /**
     * Extracted from {@link #performLayoutAndPlaceSurfacesLockedInner} to reduce size of method.
     *
     * @param w WindowState this method is applied to.
     * @param currentTime The time which animations use for calculating transitions.
     * @param innerDw Width of app window.
     * @param innerDh Height of app window.
     */
    private void handleNotObscuredLocked(final WindowState w, final long currentTime,
                                         final int innerDw, final int innerDh) {
        final WindowManager.LayoutParams attrs = w.mAttrs;
        final int attrFlags = attrs.flags;
        final boolean canBeSeen = w.isDisplayedLw();
        final boolean opaqueDrawn = canBeSeen && w.isOpaqueDrawn();

        if (opaqueDrawn && w.isFullscreen(innerDw, innerDh)) {
            // This window completely covers everything behind it,
            // so we want to leave all of them as undimmed (for
            // performance reasons).
            mInnerFields.mObscured = true;
        }

        if (w.mHasSurface) {
            if ((attrFlags&FLAG_KEEP_SCREEN_ON) != 0) {
                mInnerFields.mHoldScreen = w.mSession;
            }
            if (!mInnerFields.mSyswin && w.mAttrs.screenBrightness >= 0
                    && mInnerFields.mScreenBrightness < 0) {
                mInnerFields.mScreenBrightness = w.mAttrs.screenBrightness;
            }
            if (!mInnerFields.mSyswin && w.mAttrs.buttonBrightness >= 0
                    && mInnerFields.mButtonBrightness < 0) {
                mInnerFields.mButtonBrightness = w.mAttrs.buttonBrightness;
            }
            if (!mInnerFields.mSyswin && w.mAttrs.userActivityTimeout >= 0
                    && mInnerFields.mUserActivityTimeout < 0) {
                mInnerFields.mUserActivityTimeout = w.mAttrs.userActivityTimeout;
            }

            final int type = attrs.type;
            if (canBeSeen
                    && (type == TYPE_SYSTEM_DIALOG
                     || type == TYPE_RECENTS_OVERLAY
                     || type == TYPE_SYSTEM_ERROR
                     || (attrs.privateFlags & PRIVATE_FLAG_KEYGUARD) != 0)) {
                mInnerFields.mSyswin = true;
            }

            if (canBeSeen) {
                // This function assumes that the contents of the default display are
                // processed first before secondary displays.
                final DisplayContent displayContent = w.getDisplayContent();
                if (displayContent != null && displayContent.isDefaultDisplay) {
                    // While a dream or keyguard is showing, obscure ordinary application
                    // content on secondary displays (by forcibly enabling mirroring unless
                    // there is other content we want to show) but still allow opaque
                    // keyguard dialogs to be shown.
                    if (type == TYPE_DREAM || (attrs.privateFlags & PRIVATE_FLAG_KEYGUARD) != 0) {
                        mInnerFields.mObscureApplicationContentOnSecondaryDisplays = true;
                    }
                    mInnerFields.mDisplayHasContent = true;
                } else if (displayContent != null &&
                        (!mInnerFields.mObscureApplicationContentOnSecondaryDisplays
                        || (mInnerFields.mObscured && type == TYPE_KEYGUARD_DIALOG))) {
                    // Allow full screen keyguard presentation dialogs to be seen.
                    mInnerFields.mDisplayHasContent = true;
                }
                if (mInnerFields.mPreferredRefreshRate == 0
                        && w.mAttrs.preferredRefreshRate != 0) {
                    mInnerFields.mPreferredRefreshRate = w.mAttrs.preferredRefreshRate;
                }
            }
        }
    }

    private void handleFlagDimBehind(WindowState w) {
        final WindowManager.LayoutParams attrs = w.mAttrs;
        if ((attrs.flags & FLAG_DIM_BEHIND) != 0
                && w.isDisplayedLw()
                && !w.mExiting) {
            final WindowStateAnimator winAnimator = w.mWinAnimator;
            final TaskStack stack = w.getStack();
            stack.setDimmingTag();
            if (!stack.isDimming(winAnimator)) {
                if (localLOGV) Slog.v(TAG, "Win " + w + " start dimming.");
                stack.startDimmingIfNeeded(winAnimator);
            }
        }
    }

    private void updateAllDrawnLocked(DisplayContent displayContent) {
        // See if any windows have been drawn, so they (and others
        // associated with them) can now be shown.
        ArrayList<TaskStack> stacks = displayContent.getStacks();
        for (int stackNdx = stacks.size() - 1; stackNdx >= 0; --stackNdx) {
            final ArrayList<Task> tasks = stacks.get(stackNdx).getTasks();
            for (int taskNdx = tasks.size() - 1; taskNdx >= 0; --taskNdx) {
                final AppTokenList tokens = tasks.get(taskNdx).mAppTokens;
                for (int tokenNdx = tokens.size() - 1; tokenNdx >= 0; --tokenNdx) {
                    final AppWindowToken wtoken = tokens.get(tokenNdx);
                    if (!wtoken.allDrawn) {
                        int numInteresting = wtoken.numInterestingWindows;
                        if (numInteresting > 0 && wtoken.numDrawnWindows >= numInteresting) {
                            if (DEBUG_VISIBILITY) Slog.v(TAG,
                                    "allDrawn: " + wtoken
                                    + " interesting=" + numInteresting
                                    + " drawn=" + wtoken.numDrawnWindows);
                            wtoken.allDrawn = true;
                            mH.obtainMessage(H.NOTIFY_ACTIVITY_DRAWN, wtoken.token).sendToTarget();
                        }
                    }
                }
            }
        }
    }

    // "Something has changed!  Let's make it correct now."
    private final void performLayoutAndPlaceSurfacesLockedInner(boolean recoveringMemory) {
        if (DEBUG_WINDOW_TRACE) {
            Slog.v(TAG, "performLayoutAndPlaceSurfacesLockedInner: entry. Called by "
                    + Debug.getCallers(3));
        }

        final long currentTime = SystemClock.uptimeMillis();

        int i;
        boolean updateInputWindowsNeeded = false;

        if (mFocusMayChange) {
            mFocusMayChange = false;
            updateInputWindowsNeeded = updateFocusedWindowLocked(UPDATE_FOCUS_WILL_PLACE_SURFACES,
                    false /*updateInputWindows*/);
        }

        // Initialize state of exiting tokens.
        final int numDisplays = mDisplayContents.size();
        for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
            final DisplayContent displayContent = mDisplayContents.valueAt(displayNdx);
            for (i=displayContent.mExitingTokens.size()-1; i>=0; i--) {
                displayContent.mExitingTokens.get(i).hasVisible = false;
            }
        }

        for (int stackNdx = mStackIdToStack.size() - 1; stackNdx >= 0; --stackNdx) {
            // Initialize state of exiting applications.
            final AppTokenList exitingAppTokens =
                    mStackIdToStack.valueAt(stackNdx).mExitingAppTokens;
            for (int tokenNdx = exitingAppTokens.size() - 1; tokenNdx >= 0; --tokenNdx) {
                exitingAppTokens.get(tokenNdx).hasVisible = false;
            }
        }

        mInnerFields.mHoldScreen = null;
        mInnerFields.mScreenBrightness = -1;
        mInnerFields.mButtonBrightness = -1;
        mInnerFields.mUserActivityTimeout = -1;
        mInnerFields.mObscureApplicationContentOnSecondaryDisplays = false;

        mTransactionSequence++;

        final DisplayContent defaultDisplay = getDefaultDisplayContentLocked();
        final DisplayInfo defaultInfo = defaultDisplay.getDisplayInfo();
        final int defaultDw = defaultInfo.logicalWidth;
        final int defaultDh = defaultInfo.logicalHeight;

        if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG,
                ">>> OPEN TRANSACTION performLayoutAndPlaceSurfaces");
        SurfaceControl.openTransaction();
        try {

            if (mWatermark != null) {
                mWatermark.positionSurface(defaultDw, defaultDh);
            }
            if (mStrictModeFlash != null) {
                mStrictModeFlash.positionSurface(defaultDw, defaultDh);
            }
            if (mCircularDisplayMask != null) {
                mCircularDisplayMask.positionSurface(defaultDw, defaultDh, mRotation);
            }

            boolean focusDisplayed = false;

            for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                final DisplayContent displayContent = mDisplayContents.valueAt(displayNdx);
                boolean updateAllDrawn = false;
                WindowList windows = displayContent.getWindowList();
                DisplayInfo displayInfo = displayContent.getDisplayInfo();
                final int displayId = displayContent.getDisplayId();
                final int dw = displayInfo.logicalWidth;
                final int dh = displayInfo.logicalHeight;
                final int innerDw = displayInfo.appWidth;
                final int innerDh = displayInfo.appHeight;
                final boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);

                // Reset for each display.
                mInnerFields.mDisplayHasContent = false;
                mInnerFields.mPreferredRefreshRate = 0;

                int repeats = 0;
                do {
                    repeats++;
                    if (repeats > 6) {
                        Slog.w(TAG, "Animation repeat aborted after too many iterations");
                        displayContent.layoutNeeded = false;
                        break;
                    }

                    if (DEBUG_LAYOUT_REPEATS) debugLayoutRepeats("On entry to LockedInner",
                        displayContent.pendingLayoutChanges);

                    if ((displayContent.pendingLayoutChanges &
                            WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER) != 0 &&
                            (adjustWallpaperWindowsLocked() &
                                    ADJUST_WALLPAPER_LAYERS_CHANGED) != 0) {
                        assignLayersLocked(windows);
                        displayContent.layoutNeeded = true;
                    }

                    if (isDefaultDisplay && (displayContent.pendingLayoutChanges
                            & WindowManagerPolicy.FINISH_LAYOUT_REDO_CONFIG) != 0) {
                        if (DEBUG_LAYOUT) Slog.v(TAG, "Computing new config from layout");
                        if (updateOrientationFromAppTokensLocked(true)) {
                            displayContent.layoutNeeded = true;
                            mH.sendEmptyMessage(H.SEND_NEW_CONFIGURATION);
                        }
                    }

                    if ((displayContent.pendingLayoutChanges
                            & WindowManagerPolicy.FINISH_LAYOUT_REDO_LAYOUT) != 0) {
                        displayContent.layoutNeeded = true;
                    }

                    // FIRST LOOP: Perform a layout, if needed.
                    if (repeats < 4) {
                        performLayoutLockedInner(displayContent, repeats == 1,
                                false /*updateInputWindows*/);
                    } else {
                        Slog.w(TAG, "Layout repeat skipped after too many iterations");
                    }

                    // FIRST AND ONE HALF LOOP: Make WindowManagerPolicy think
                    // it is animating.
                    displayContent.pendingLayoutChanges = 0;

                    if (DEBUG_LAYOUT_REPEATS) debugLayoutRepeats("loop number "
                            + mLayoutRepeatCount, displayContent.pendingLayoutChanges);

                    if (isDefaultDisplay) {
                        mPolicy.beginPostLayoutPolicyLw(dw, dh);
                        for (i = windows.size() - 1; i >= 0; i--) {
                            WindowState w = windows.get(i);
                            if (w.mHasSurface) {
                                mPolicy.applyPostLayoutPolicyLw(w, w.mAttrs);
                            }
                        }
                        displayContent.pendingLayoutChanges |= mPolicy.finishPostLayoutPolicyLw();
                        if (DEBUG_LAYOUT_REPEATS) debugLayoutRepeats(
                            "after finishPostLayoutPolicyLw", displayContent.pendingLayoutChanges);
                    }
                } while (displayContent.pendingLayoutChanges != 0);

                mInnerFields.mObscured = false;
                mInnerFields.mSyswin = false;
                displayContent.resetDimming();

                // Only used if default window
                final boolean someoneLosingFocus = !mLosingFocus.isEmpty();

                final int N = windows.size();
                for (i=N-1; i>=0; i--) {
                    WindowState w = windows.get(i);
                    final TaskStack stack = w.getStack();
                    if (stack == null) {
                        continue;
                    }

                    final boolean obscuredChanged = w.mObscured != mInnerFields.mObscured;

                    // Update effect.
                    w.mObscured = mInnerFields.mObscured;
                    if (!mInnerFields.mObscured) {
                        handleNotObscuredLocked(w, currentTime, innerDw, innerDh);
                    }

                    if (!stack.testDimmingTag()) {
                        handleFlagDimBehind(w);
                    }

                    if (isDefaultDisplay && obscuredChanged && (mWallpaperTarget == w)
                            && w.isVisibleLw()) {
                        // This is the wallpaper target and its obscured state
                        // changed... make sure the current wallaper's visibility
                        // has been updated accordingly.
                        updateWallpaperVisibilityLocked();
                    }

                    final WindowStateAnimator winAnimator = w.mWinAnimator;

                    // If the window has moved due to its containing
                    // content frame changing, then we'd like to animate
                    // it.
                    if (w.mHasSurface && w.shouldAnimateMove()) {
                        // Frame has moved, containing content frame
                        // has also moved, and we're not currently animating...
                        // let's do something.
                        Animation a = AnimationUtils.loadAnimation(mContext,
                                com.android.internal.R.anim.window_move_from_decor);
                        winAnimator.setAnimation(a);
                        winAnimator.mAnimDw = w.mLastFrame.left - w.mFrame.left;
                        winAnimator.mAnimDh = w.mLastFrame.top - w.mFrame.top;

                        //TODO (multidisplay): Accessibility supported only for the default display.
                        if (mAccessibilityController != null
                                && displayId == Display.DEFAULT_DISPLAY) {
                            mAccessibilityController.onSomeWindowResizedOrMovedLocked();
                        }

                        try {
                            w.mClient.moved(w.mFrame.left, w.mFrame.top);
                        } catch (RemoteException e) {
                        }
                    }

                    //Slog.i(TAG, "Window " + this + " clearing mContentChanged - done placing");
                    w.mContentChanged = false;

                    // Moved from updateWindowsAndWallpaperLocked().
                    if (w.mHasSurface) {
                        // Take care of the window being ready to display.
                        final boolean committed =
                                winAnimator.commitFinishDrawingLocked(currentTime);
                        if (isDefaultDisplay && committed) {
                            if (w.mAttrs.type == TYPE_DREAM) {
                                // HACK: When a dream is shown, it may at that
                                // point hide the lock screen.  So we need to
                                // redo the layout to let the phone window manager
                                // make this happen.
                                displayContent.pendingLayoutChanges |=
                                        WindowManagerPolicy.FINISH_LAYOUT_REDO_LAYOUT;
                                if (DEBUG_LAYOUT_REPEATS) {
                                    debugLayoutRepeats(
                                        "dream and commitFinishDrawingLocked true",
                                        displayContent.pendingLayoutChanges);
                                }
                            }
                            if ((w.mAttrs.flags & FLAG_SHOW_WALLPAPER) != 0) {
                                if (DEBUG_WALLPAPER_LIGHT) Slog.v(TAG,
                                        "First draw done in potential wallpaper target " + w);
                                mInnerFields.mWallpaperMayChange = true;
                                displayContent.pendingLayoutChanges |=
                                        WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
                                if (DEBUG_LAYOUT_REPEATS) {
                                    debugLayoutRepeats(
                                        "wallpaper and commitFinishDrawingLocked true",
                                        displayContent.pendingLayoutChanges);
                                }
                            }
                        }

                        winAnimator.setSurfaceBoundariesLocked(recoveringMemory);

                        final AppWindowToken atoken = w.mAppToken;
                        if (DEBUG_STARTING_WINDOW && atoken != null
                                && w == atoken.startingWindow) {
                            Slog.d(TAG, "updateWindows: starting " + w + " isOnScreen="
                                + w.isOnScreen() + " allDrawn=" + atoken.allDrawn
                                + " freezingScreen=" + atoken.mAppAnimator.freezingScreen);
                        }
                        if (atoken != null
                                && (!atoken.allDrawn || atoken.mAppAnimator.freezingScreen)) {
                            if (atoken.lastTransactionSequence != mTransactionSequence) {
                                atoken.lastTransactionSequence = mTransactionSequence;
                                atoken.numInterestingWindows = atoken.numDrawnWindows = 0;
                                atoken.startingDisplayed = false;
                            }
                            if ((w.isOnScreen() || winAnimator.mAttrType == TYPE_BASE_APPLICATION)
                                    && !w.mExiting && !w.mDestroying) {
                                if (DEBUG_VISIBILITY || DEBUG_ORIENTATION) {
                                    Slog.v(TAG, "Eval win " + w + ": isDrawn=" + w.isDrawnLw()
                                            + ", isAnimating=" + winAnimator.isAnimating());
                                    if (!w.isDrawnLw()) {
                                        Slog.v(TAG, "Not displayed: s=" + winAnimator.mSurfaceControl
                                                + " pv=" + w.mPolicyVisibility
                                                + " mDrawState=" + winAnimator.mDrawState
                                                + " ah=" + w.mAttachedHidden
                                                + " th=" + atoken.hiddenRequested
                                                + " a=" + winAnimator.mAnimating);
                                    }
                                }
                                if (w != atoken.startingWindow) {
                                    if (!atoken.mAppAnimator.freezingScreen || !w.mAppFreezing) {
                                        atoken.numInterestingWindows++;
                                        if (w.isDrawnLw()) {
                                            atoken.numDrawnWindows++;
                                            if (DEBUG_VISIBILITY || DEBUG_ORIENTATION) Slog.v(TAG,
                                                    "tokenMayBeDrawn: " + atoken
                                                    + " freezingScreen=" + atoken.mAppAnimator.freezingScreen
                                                    + " mAppFreezing=" + w.mAppFreezing);
                                            updateAllDrawn = true;
                                        }
                                    }
                                } else if (w.isDrawnLw()) {
                                    atoken.startingDisplayed = true;
                                }
                            }
                        }
                    }

                    if (isDefaultDisplay && someoneLosingFocus && (w == mCurrentFocus)
                            && w.isDisplayedLw()) {
                        focusDisplayed = true;
                    }

                    updateResizingWindows(w);
                }

                mDisplayManagerInternal.setDisplayProperties(displayId,
                        mInnerFields.mDisplayHasContent, mInnerFields.mPreferredRefreshRate,
                        true /* inTraversal, must call performTraversalInTrans... below */);

                getDisplayContentLocked(displayId).stopDimmingIfNeeded();

                if (updateAllDrawn) {
                    updateAllDrawnLocked(displayContent);
                }
            }

            if (focusDisplayed) {
                mH.sendEmptyMessage(H.REPORT_LOSING_FOCUS);
            }

            // Give the display manager a chance to adjust properties
            // like display rotation if it needs to.
            mDisplayManagerInternal.performTraversalInTransactionFromWindowManager();

        } catch (RuntimeException e) {
            Log.wtf(TAG, "Unhandled exception in Window Manager", e);
        } finally {
            SurfaceControl.closeTransaction();
            if (SHOW_LIGHT_TRANSACTIONS) Slog.i(TAG,
                    "<<< CLOSE TRANSACTION performLayoutAndPlaceSurfaces");
        }

        final WindowList defaultWindows = defaultDisplay.getWindowList();

        // If we are ready to perform an app transition, check through
        // all of the app tokens to be shown and see if they are ready
        // to go.
        if (mAppTransition.isReady()) {
            defaultDisplay.pendingLayoutChanges |= handleAppTransitionReadyLocked(defaultWindows);
            if (DEBUG_LAYOUT_REPEATS) debugLayoutRepeats("after handleAppTransitionReadyLocked",
                    defaultDisplay.pendingLayoutChanges);
        }

        if (!mAnimator.mAnimating && mAppTransition.isRunning()) {
            // We have finished the animation of an app transition.  To do
            // this, we have delayed a lot of operations like showing and
            // hiding apps, moving apps in Z-order, etc.  The app token list
            // reflects the correct Z-order, but the window list may now
            // be out of sync with it.  So here we will just rebuild the
            // entire app window list.  Fun!
            defaultDisplay.pendingLayoutChanges |= handleAnimatingStoppedAndTransitionLocked();
            if (DEBUG_LAYOUT_REPEATS) debugLayoutRepeats("after handleAnimStopAndXitionLock",
                defaultDisplay.pendingLayoutChanges);
        }

        if (mInnerFields.mWallpaperForceHidingChanged && defaultDisplay.pendingLayoutChanges == 0
                && !mAppTransition.isReady()) {
            // At this point, there was a window with a wallpaper that
            // was force hiding other windows behind it, but now it
            // is going away.  This may be simple -- just animate
            // away the wallpaper and its window -- or it may be
            // hard -- the wallpaper now needs to be shown behind
            // something that was hidden.
            defaultDisplay.pendingLayoutChanges |= WindowManagerPolicy.FINISH_LAYOUT_REDO_LAYOUT;
            if (DEBUG_LAYOUT_REPEATS) debugLayoutRepeats("after animateAwayWallpaperLocked",
                defaultDisplay.pendingLayoutChanges);
        }
        mInnerFields.mWallpaperForceHidingChanged = false;

        if (mInnerFields.mWallpaperMayChange) {
            if (DEBUG_WALLPAPER_LIGHT) Slog.v(TAG, "Wallpaper may change!  Adjusting");
            defaultDisplay.pendingLayoutChanges |=
                    WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
            if (DEBUG_LAYOUT_REPEATS) debugLayoutRepeats("WallpaperMayChange",
                    defaultDisplay.pendingLayoutChanges);
        }

        if (mFocusMayChange) {
            mFocusMayChange = false;
            if (updateFocusedWindowLocked(UPDATE_FOCUS_PLACING_SURFACES,
                    false /*updateInputWindows*/)) {
                updateInputWindowsNeeded = true;
                defaultDisplay.pendingLayoutChanges |= WindowManagerPolicy.FINISH_LAYOUT_REDO_ANIM;
            }
        }

        if (needsLayout()) {
            defaultDisplay.pendingLayoutChanges |= WindowManagerPolicy.FINISH_LAYOUT_REDO_LAYOUT;
            if (DEBUG_LAYOUT_REPEATS) debugLayoutRepeats("mLayoutNeeded",
                    defaultDisplay.pendingLayoutChanges);
        }

        for (i = mResizingWindows.size() - 1; i >= 0; i--) {
            WindowState win = mResizingWindows.get(i);
            if (win.mAppFreezing) {
                // Don't remove this window until rotation has completed.
                continue;
            }
            win.reportResized();
            mResizingWindows.remove(i);
        }

        if (DEBUG_ORIENTATION && mDisplayFrozen) Slog.v(TAG,
                "With display frozen, orientationChangeComplete="
                + mInnerFields.mOrientationChangeComplete);
        if (mInnerFields.mOrientationChangeComplete) {
            if (mWindowsFreezingScreen) {
                mWindowsFreezingScreen = false;
                mLastFinishedFreezeSource = mInnerFields.mLastWindowFreezeSource;
                mH.removeMessages(H.WINDOW_FREEZE_TIMEOUT);
            }
            stopFreezingDisplayLocked();
        }

        // Destroy the surface of any windows that are no longer visible.
        boolean wallpaperDestroyed = false;
        i = mDestroySurface.size();
        if (i > 0) {
            do {
                i--;
                WindowState win = mDestroySurface.get(i);
                win.mDestroying = false;
                if (mInputMethodWindow == win) {
                    mInputMethodWindow = null;
                }
                if (win == mWallpaperTarget) {
                    wallpaperDestroyed = true;
                }
                win.mWinAnimator.destroySurfaceLocked();
            } while (i > 0);
            mDestroySurface.clear();
        }

        // Time to remove any exiting tokens?
        for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
            final DisplayContent displayContent = mDisplayContents.valueAt(displayNdx);
            ArrayList<WindowToken> exitingTokens = displayContent.mExitingTokens;
            for (i = exitingTokens.size() - 1; i >= 0; i--) {
                WindowToken token = exitingTokens.get(i);
                if (!token.hasVisible) {
                    exitingTokens.remove(i);
                    if (token.windowType == TYPE_WALLPAPER) {
                        mWallpaperTokens.remove(token);
                    }
                }
            }
        }

        // Time to remove any exiting applications?
        for (int stackNdx = mStackIdToStack.size() - 1; stackNdx >= 0; --stackNdx) {
            // Initialize state of exiting applications.
            final AppTokenList exitingAppTokens =
                    mStackIdToStack.valueAt(stackNdx).mExitingAppTokens;
            for (i = exitingAppTokens.size() - 1; i >= 0; i--) {
                AppWindowToken token = exitingAppTokens.get(i);
                if (!token.hasVisible && !mClosingApps.contains(token) && !token.mDeferRemoval) {
                    // Make sure there is no animation running on this token,
                    // so any windows associated with it will be removed as
                    // soon as their animations are complete
                    token.mAppAnimator.clearAnimation();
                    token.mAppAnimator.animating = false;
                    if (DEBUG_ADD_REMOVE || DEBUG_TOKEN_MOVEMENT) Slog.v(TAG,
                            "performLayout: App token exiting now removed" + token);
                    removeAppFromTaskLocked(token);
                    exitingAppTokens.remove(i);
                }
            }
        }

        if (!mAnimator.mAnimating && mRelayoutWhileAnimating.size() > 0) {
            for (int j=mRelayoutWhileAnimating.size()-1; j>=0; j--) {
                try {
                    mRelayoutWhileAnimating.get(j).mClient.doneAnimating();
                } catch (RemoteException e) {
                }
            }
            mRelayoutWhileAnimating.clear();
        }

        if (wallpaperDestroyed) {
            defaultDisplay.pendingLayoutChanges |=
                    WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
            defaultDisplay.layoutNeeded = true;
        }

        for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
            final DisplayContent displayContent = mDisplayContents.valueAt(displayNdx);
            if (displayContent.pendingLayoutChanges != 0) {
                displayContent.layoutNeeded = true;
            }
        }

        // Finally update all input windows now that the window changes have stabilized.
        mInputMonitor.updateInputWindowsLw(true /*force*/);

        setHoldScreenLocked(mInnerFields.mHoldScreen);
        if (!mDisplayFrozen) {
            if (mInnerFields.mScreenBrightness < 0 || mInnerFields.mScreenBrightness > 1.0f) {
                mPowerManagerInternal.setScreenBrightnessOverrideFromWindowManager(-1);
            } else {
                mPowerManagerInternal.setScreenBrightnessOverrideFromWindowManager(
                        toBrightnessOverride(mInnerFields.mScreenBrightness));
            }
            if (mInnerFields.mButtonBrightness < 0 || mInnerFields.mButtonBrightness > 1.0f) {
                mPowerManagerInternal.setButtonBrightnessOverrideFromWindowManager(-1);
            } else {
                mPowerManagerInternal.setButtonBrightnessOverrideFromWindowManager(
                        toBrightnessOverride(mInnerFields.mButtonBrightness));
            }
            mPowerManagerInternal.setUserActivityTimeoutOverrideFromWindowManager(
                    mInnerFields.mUserActivityTimeout);
        }

        if (mTurnOnScreen) {
            if (DEBUG_VISIBILITY) Slog.v(TAG, "Turning screen on after layout!");
            mPowerManager.wakeUp(SystemClock.uptimeMillis());
            mTurnOnScreen = false;
        }

        if (mInnerFields.mUpdateRotation) {
            if (DEBUG_ORIENTATION) Slog.d(TAG, "Performing post-rotate rotation");
            if (updateRotationUncheckedLocked(false)) {
                mH.sendEmptyMessage(H.SEND_NEW_CONFIGURATION);
            } else {
                mInnerFields.mUpdateRotation = false;
            }
        }

        if (mWaitingForDrawnCallback != null ||
                (mInnerFields.mOrientationChangeComplete && !defaultDisplay.layoutNeeded &&
                        !mInnerFields.mUpdateRotation)) {
            checkDrawnWindowsLocked();
        }

        final int N = mPendingRemove.size();
        if (N > 0) {
            if (mPendingRemoveTmp.length < N) {
                mPendingRemoveTmp = new WindowState[N+10];
            }
            mPendingRemove.toArray(mPendingRemoveTmp);
            mPendingRemove.clear();
            DisplayContentList displayList = new DisplayContentList();
            for (i = 0; i < N; i++) {
                WindowState w = mPendingRemoveTmp[i];
                removeWindowInnerLocked(w.mSession, w);
                final DisplayContent displayContent = w.getDisplayContent();
                if (displayContent != null && !displayList.contains(displayContent)) {
                    displayList.add(displayContent);
                }
            }

            for (DisplayContent displayContent : displayList) {
                assignLayersLocked(displayContent.getWindowList());
                displayContent.layoutNeeded = true;
            }
        }

        // Remove all deferred displays stacks, tasks, and activities.
        for (int displayNdx = mDisplayContents.size() - 1; displayNdx >= 0; --displayNdx) {
            mDisplayContents.valueAt(displayNdx).checkForDeferredActions();
        }

        if (updateInputWindowsNeeded) {
            mInputMonitor.updateInputWindowsLw(false /*force*/);
        }
        setFocusedStackFrame();

        // Check to see if we are now in a state where the screen should
        // be enabled, because the window obscured flags have changed.
        enableScreenIfNeededLocked();

        scheduleAnimationLocked();

        if (DEBUG_WINDOW_TRACE) {
            Slog.e(TAG, "performLayoutAndPlaceSurfacesLockedInner exit: animating="
                    + mAnimator.mAnimating);
        }
    }

    private int toBrightnessOverride(float value) {
        return (int)(value * PowerManager.BRIGHTNESS_ON);
    }

    void checkDrawnWindowsLocked() {
        if (mWaitingForDrawn.isEmpty() || mWaitingForDrawnCallback == null) {
            return;
        }
        for (int j = mWaitingForDrawn.size() - 1; j >= 0; j--) {
            WindowState win = mWaitingForDrawn.get(j);
            if (DEBUG_SCREEN_ON) Slog.i(TAG, "Waiting for drawn " + win +
                    ": removed=" + win.mRemoved + " visible=" + win.isVisibleLw() +
                    " mHasSurface=" + win.mHasSurface +
                    " drawState=" + win.mWinAnimator.mDrawState);
            if (win.mRemoved || !win.mHasSurface) {
                // Window has been removed; no draw will now happen, so stop waiting.
                if (DEBUG_SCREEN_ON) Slog.w(TAG, "Aborted waiting for drawn: " + win);
                mWaitingForDrawn.remove(win);
            } else if (win.hasDrawnLw()) {
                // Window is now drawn (and shown).
                if (DEBUG_SCREEN_ON) Slog.d(TAG, "Window drawn win=" + win);
                mWaitingForDrawn.remove(win);
            }
        }
        if (mWaitingForDrawn.isEmpty()) {
            if (DEBUG_SCREEN_ON) Slog.d(TAG, "All windows drawn!");
            mH.removeMessages(H.WAITING_FOR_DRAWN_TIMEOUT);
            mH.sendEmptyMessage(H.ALL_WINDOWS_DRAWN);
        }
    }

    void setHoldScreenLocked(final Session newHoldScreen) {
        final boolean hold = newHoldScreen != null;

        if (hold && mHoldingScreenOn != newHoldScreen) {
            mHoldingScreenWakeLock.setWorkSource(new WorkSource(newHoldScreen.mUid));
        }
        mHoldingScreenOn = newHoldScreen;

        final boolean state = mHoldingScreenWakeLock.isHeld();
        if (hold != state) {
            if (hold) {
                mHoldingScreenWakeLock.acquire();
                mPolicy.keepScreenOnStartedLw();
            } else {
                mPolicy.keepScreenOnStoppedLw();
                mHoldingScreenWakeLock.release();
            }
        }
    }

    void requestTraversal() {
        synchronized (mWindowMap) {
            requestTraversalLocked();
        }
    }

    void requestTraversalLocked() {
        if (!mTraversalScheduled) {
            mTraversalScheduled = true;
            mH.sendEmptyMessage(H.DO_TRAVERSAL);
        }
    }

    /** Note that Locked in this case is on mLayoutToAnim */
    void scheduleAnimationLocked() {
        if (!mAnimationScheduled) {
            mAnimationScheduled = true;
            mChoreographer.postCallback(
                    Choreographer.CALLBACK_ANIMATION, mAnimator.mAnimationRunnable, null);
        }
    }

    private boolean needsLayout() {
        final int numDisplays = mDisplayContents.size();
        for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
            final DisplayContent displayContent = mDisplayContents.valueAt(displayNdx);
            if (displayContent.layoutNeeded) {
                return true;
            }
        }
        return false;
    }

    boolean copyAnimToLayoutParamsLocked() {
        boolean doRequest = false;

        final int bulkUpdateParams = mAnimator.mBulkUpdateParams;
        if ((bulkUpdateParams & LayoutFields.SET_UPDATE_ROTATION) != 0) {
            mInnerFields.mUpdateRotation = true;
            doRequest = true;
        }
        if ((bulkUpdateParams & LayoutFields.SET_WALLPAPER_MAY_CHANGE) != 0) {
            mInnerFields.mWallpaperMayChange = true;
            doRequest = true;
        }
        if ((bulkUpdateParams & LayoutFields.SET_FORCE_HIDING_CHANGED) != 0) {
            mInnerFields.mWallpaperForceHidingChanged = true;
            doRequest = true;
        }
        if ((bulkUpdateParams & LayoutFields.SET_ORIENTATION_CHANGE_COMPLETE) == 0) {
            mInnerFields.mOrientationChangeComplete = false;
        } else {
            mInnerFields.mOrientationChangeComplete = true;
            mInnerFields.mLastWindowFreezeSource = mAnimator.mLastWindowFreezeSource;
            if (mWindowsFreezingScreen) {
                doRequest = true;
            }
        }
        if ((bulkUpdateParams & LayoutFields.SET_TURN_ON_SCREEN) != 0) {
            mTurnOnScreen = true;
        }
        if ((bulkUpdateParams & LayoutFields.SET_WALLPAPER_ACTION_PENDING) != 0) {
            mInnerFields.mWallpaperActionPending = true;
        }

        return doRequest;
    }

    /** If a window that has an animation specifying a colored background and the current wallpaper
     * is visible, then the color goes *below* the wallpaper so we don't cause the wallpaper to
     * suddenly disappear. */
    int adjustAnimationBackground(WindowStateAnimator winAnimator) {
        WindowList windows = winAnimator.mWin.getWindowList();
        for (int i = windows.size() - 1; i >= 0; --i) {
            WindowState testWin = windows.get(i);
            if (testWin.mIsWallpaper && testWin.isVisibleNow()) {
                return testWin.mWinAnimator.mAnimLayer;
            }
        }
        return winAnimator.mAnimLayer;
    }

    boolean reclaimSomeSurfaceMemoryLocked(WindowStateAnimator winAnimator, String operation,
                                           boolean secure) {
        final SurfaceControl surface = winAnimator.mSurfaceControl;
        boolean leakedSurface = false;
        boolean killedApps = false;

        EventLog.writeEvent(EventLogTags.WM_NO_SURFACE_MEMORY, winAnimator.mWin.toString(),
                winAnimator.mSession.mPid, operation);

        if (mForceRemoves == null) {
            mForceRemoves = new ArrayList<WindowState>();
        }

        long callingIdentity = Binder.clearCallingIdentity();
        try {
            // There was some problem...   first, do a sanity check of the
            // window list to make sure we haven't left any dangling surfaces
            // around.

            Slog.i(TAG, "Out of memory for surface!  Looking for leaks...");
            final int numDisplays = mDisplayContents.size();
            for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                final WindowList windows = mDisplayContents.valueAt(displayNdx).getWindowList();
                final int numWindows = windows.size();
                for (int winNdx = 0; winNdx < numWindows; ++winNdx) {
                    final WindowState ws = windows.get(winNdx);
                    WindowStateAnimator wsa = ws.mWinAnimator;
                    if (wsa.mSurfaceControl != null) {
                        if (!mSessions.contains(wsa.mSession)) {
                            Slog.w(TAG, "LEAKED SURFACE (session doesn't exist): "
                                    + ws + " surface=" + wsa.mSurfaceControl
                                    + " token=" + ws.mToken
                                    + " pid=" + ws.mSession.mPid
                                    + " uid=" + ws.mSession.mUid);
                            if (SHOW_TRANSACTIONS) logSurface(ws, "LEAK DESTROY", null);
                            wsa.mSurfaceControl.destroy();
                            wsa.mSurfaceShown = false;
                            wsa.mSurfaceControl = null;
                            ws.mHasSurface = false;
                            mForceRemoves.add(ws);
                            leakedSurface = true;
                        } else if (ws.mAppToken != null && ws.mAppToken.clientHidden) {
                            Slog.w(TAG, "LEAKED SURFACE (app token hidden): "
                                    + ws + " surface=" + wsa.mSurfaceControl
                                    + " token=" + ws.mAppToken);
                            if (SHOW_TRANSACTIONS) logSurface(ws, "LEAK DESTROY", null);
                            wsa.mSurfaceControl.destroy();
                            wsa.mSurfaceShown = false;
                            wsa.mSurfaceControl = null;
                            ws.mHasSurface = false;
                            leakedSurface = true;
                        }
                    }
                }
            }

            if (!leakedSurface) {
                Slog.w(TAG, "No leaked surfaces; killing applicatons!");
                SparseIntArray pidCandidates = new SparseIntArray();
                for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                    final WindowList windows = mDisplayContents.valueAt(displayNdx).getWindowList();
                    final int numWindows = windows.size();
                    for (int winNdx = 0; winNdx < numWindows; ++winNdx) {
                        final WindowState ws = windows.get(winNdx);
                        if (mForceRemoves.contains(ws)) {
                            continue;
                        }
                        WindowStateAnimator wsa = ws.mWinAnimator;
                        if (wsa.mSurfaceControl != null) {
                            pidCandidates.append(wsa.mSession.mPid, wsa.mSession.mPid);
                        }
                    }
                    if (pidCandidates.size() > 0) {
                        int[] pids = new int[pidCandidates.size()];
                        for (int i=0; i<pids.length; i++) {
                            pids[i] = pidCandidates.keyAt(i);
                        }
                        try {
                            if (mActivityManager.killPids(pids, "Free memory", secure)) {
                                killedApps = true;
                            }
                        } catch (RemoteException e) {
                        }
                    }
                }
            }

            if (leakedSurface || killedApps) {
                // We managed to reclaim some memory, so get rid of the trouble
                // surface and ask the app to request another one.
                Slog.w(TAG, "Looks like we have reclaimed some memory, clearing surface for retry.");
                if (surface != null) {
                    if (SHOW_TRANSACTIONS || SHOW_SURFACE_ALLOC) logSurface(winAnimator.mWin,
                            "RECOVER DESTROY", null);
                    surface.destroy();
                    winAnimator.mSurfaceShown = false;
                    winAnimator.mSurfaceControl = null;
                    winAnimator.mWin.mHasSurface = false;
                    scheduleRemoveStartingWindow(winAnimator.mWin.mAppToken);
                }

                try {
                    winAnimator.mWin.mClient.dispatchGetNewSurface();
                } catch (RemoteException e) {
                }
            }
        } finally {
            Binder.restoreCallingIdentity(callingIdentity);
        }

        return leakedSurface || killedApps;
    }

    private boolean updateFocusedWindowLocked(int mode, boolean updateInputWindows) {
        WindowState newFocus = computeFocusedWindowLocked();
        if (mCurrentFocus != newFocus) {
            Trace.traceBegin(Trace.TRACE_TAG_WINDOW_MANAGER, "wmUpdateFocus");
            // This check makes sure that we don't already have the focus
            // change message pending.
            mH.removeMessages(H.REPORT_FOCUS_CHANGE);
            mH.sendEmptyMessage(H.REPORT_FOCUS_CHANGE);
            // TODO(multidisplay): Focused windows on default display only.
            final DisplayContent displayContent = getDefaultDisplayContentLocked();
            final boolean imWindowChanged = moveInputMethodWindowsIfNeededLocked(
                    mode != UPDATE_FOCUS_WILL_ASSIGN_LAYERS
                            && mode != UPDATE_FOCUS_WILL_PLACE_SURFACES);
            if (imWindowChanged) {
                displayContent.layoutNeeded = true;
                newFocus = computeFocusedWindowLocked();
            }

            if (DEBUG_FOCUS_LIGHT || localLOGV) Slog.v(TAG, "Changing focus from " +
                    mCurrentFocus + " to " + newFocus + " Callers=" + Debug.getCallers(4));
            final WindowState oldFocus = mCurrentFocus;
            mCurrentFocus = newFocus;
            mLosingFocus.remove(newFocus);

            // TODO(multidisplay): Accessibilty supported only of default desiplay.
            if (mAccessibilityController != null
                    && displayContent.getDisplayId() == Display.DEFAULT_DISPLAY) {
                mAccessibilityController.onWindowFocusChangedLocked();
            }

            int focusChanged = mPolicy.focusChangedLw(oldFocus, newFocus);

            if (imWindowChanged && oldFocus != mInputMethodWindow) {
                // Focus of the input method window changed. Perform layout if needed.
                if (mode == UPDATE_FOCUS_PLACING_SURFACES) {
                    performLayoutLockedInner(displayContent, true /*initial*/, updateInputWindows);
                    focusChanged &= ~WindowManagerPolicy.FINISH_LAYOUT_REDO_LAYOUT;
                } else if (mode == UPDATE_FOCUS_WILL_PLACE_SURFACES) {
                    // Client will do the layout, but we need to assign layers
                    // for handleNewWindowLocked() below.
                    assignLayersLocked(displayContent.getWindowList());
                }
            }

            if ((focusChanged & WindowManagerPolicy.FINISH_LAYOUT_REDO_LAYOUT) != 0) {
                // The change in focus caused us to need to do a layout.  Okay.
                displayContent.layoutNeeded = true;
                if (mode == UPDATE_FOCUS_PLACING_SURFACES) {
                    performLayoutLockedInner(displayContent, true /*initial*/, updateInputWindows);
                }
            }

            if (mode != UPDATE_FOCUS_WILL_ASSIGN_LAYERS) {
                // If we defer assigning layers, then the caller is responsible for
                // doing this part.
                mInputMonitor.setInputFocusLw(mCurrentFocus, updateInputWindows);
            }

            Trace.traceEnd(Trace.TRACE_TAG_WINDOW_MANAGER);
            return true;
        }
        return false;
    }

    private WindowState computeFocusedWindowLocked() {
        if (mAnimator.mUniverseBackground != null
                && mAnimator.mUniverseBackground.mWin.canReceiveKeys()) {
            return mAnimator.mUniverseBackground.mWin;
        }

        final int displayCount = mDisplayContents.size();
        for (int i = 0; i < displayCount; i++) {
            final DisplayContent displayContent = mDisplayContents.valueAt(i);
            WindowState win = findFocusedWindowLocked(displayContent);
            if (win != null) {
                return win;
            }
        }
        return null;
    }

    private WindowState findFocusedWindowLocked(DisplayContent displayContent) {
        final WindowList windows = displayContent.getWindowList();
        for (int i = windows.size() - 1; i >= 0; i--) {
            final WindowState win = windows.get(i);

            if (localLOGV || DEBUG_FOCUS) Slog.v(
                TAG, "Looking for focus: " + i
                + " = " + win
                + ", flags=" + win.mAttrs.flags
                + ", canReceive=" + win.canReceiveKeys());

            AppWindowToken wtoken = win.mAppToken;

            // If this window's application has been removed, just skip it.
            if (wtoken != null && (wtoken.removed || wtoken.sendingToBottom)) {
                if (DEBUG_FOCUS) Slog.v(TAG, "Skipping " + wtoken + " because "
                        + (wtoken.removed ? "removed" : "sendingToBottom"));
                continue;
            }

            if (!win.canReceiveKeys()) {
                continue;
            }

            // Descend through all of the app tokens and find the first that either matches
            // win.mAppToken (return win) or mFocusedApp (return null).
            if (wtoken != null && win.mAttrs.type != TYPE_APPLICATION_STARTING &&
                    mFocusedApp != null) {
                ArrayList<Task> tasks = displayContent.getTasks();
                for (int taskNdx = tasks.size() - 1; taskNdx >= 0; --taskNdx) {
                    AppTokenList tokens = tasks.get(taskNdx).mAppTokens;
                    int tokenNdx = tokens.size() - 1;
                    for ( ; tokenNdx >= 0; --tokenNdx) {
                        final AppWindowToken token = tokens.get(tokenNdx);
                        if (wtoken == token) {
                            break;
                        }
                        if (mFocusedApp == token) {
                            // Whoops, we are below the focused app...  no focus for you!
                            if (localLOGV || DEBUG_FOCUS_LIGHT) Slog.v(TAG,
                                    "findFocusedWindow: Reached focused app=" + mFocusedApp);
                            return null;
                        }
                    }
                    if (tokenNdx >= 0) {
                        // Early exit from loop, must have found the matching token.
                        break;
                    }
                }
            }

            if (DEBUG_FOCUS_LIGHT) Slog.v(TAG, "findFocusedWindow: Found new focus @ " + i +
                        " = " + win);
            return win;
        }

        if (DEBUG_FOCUS_LIGHT) Slog.v(TAG, "findFocusedWindow: No focusable windows.");
        return null;
    }

    private void startFreezingDisplayLocked(boolean inTransaction, int exitAnim, int enterAnim) {
        if (mDisplayFrozen) {
            return;
        }

        if (!mDisplayReady || !mPolicy.isScreenOnFully()) {
            // No need to freeze the screen before the system is ready or if
            // the screen is off.
            return;
        }

        mScreenFrozenLock.acquire();

        mDisplayFrozen = true;
        mDisplayFreezeTime = SystemClock.elapsedRealtime();
        mLastFinishedFreezeSource = null;

        mInputMonitor.freezeInputDispatchingLw();

        // Clear the last input window -- that is just used for
        // clean transitions between IMEs, and if we are freezing
        // the screen then the whole world is changing behind the scenes.
        mPolicy.setLastInputMethodWindowLw(null, null);

        if (mAppTransition.isTransitionSet()) {
            mAppTransition.freeze();
        }

        if (PROFILE_ORIENTATION) {
            File file = new File("/data/system/frozen");
            Debug.startMethodTracing(file.toString(), 8 * 1024 * 1024);
        }

        if (CUSTOM_SCREEN_ROTATION) {
            mExitAnimId = exitAnim;
            mEnterAnimId = enterAnim;
            final DisplayContent displayContent = getDefaultDisplayContentLocked();
            final int displayId = displayContent.getDisplayId();
            ScreenRotationAnimation screenRotationAnimation =
                    mAnimator.getScreenRotationAnimationLocked(displayId);
            if (screenRotationAnimation != null) {
                screenRotationAnimation.kill();
            }

            // Check whether the current screen contains any secure content.
            boolean isSecure = false;
            final WindowList windows = getDefaultWindowListLocked();
            final int N = windows.size();
            for (int i = 0; i < N; i++) {
                WindowState ws = windows.get(i);
                if (ws.isOnScreen() && (ws.mAttrs.flags & FLAG_SECURE) != 0) {
                    isSecure = true;
                    break;
                }
            }

            // TODO(multidisplay): rotation on main screen only.
            displayContent.updateDisplayInfo();
            screenRotationAnimation = new ScreenRotationAnimation(mContext, displayContent,
                    mFxSession, inTransaction, mPolicy.isDefaultOrientationForced(), isSecure);
            mAnimator.setScreenRotationAnimationLocked(displayId, screenRotationAnimation);
        }
    }

    private void stopFreezingDisplayLocked() {
        if (!mDisplayFrozen) {
            return;
        }

        if (mWaitingForConfig || mAppsFreezingScreen > 0 || mWindowsFreezingScreen
                || mClientFreezingScreen) {
            if (DEBUG_ORIENTATION) Slog.d(TAG,
                "stopFreezingDisplayLocked: Returning mWaitingForConfig=" + mWaitingForConfig
                + ", mAppsFreezingScreen=" + mAppsFreezingScreen
                + ", mWindowsFreezingScreen=" + mWindowsFreezingScreen
                + ", mClientFreezingScreen=" + mClientFreezingScreen);
            return;
        }

        mDisplayFrozen = false;
        mLastDisplayFreezeDuration = (int)(SystemClock.elapsedRealtime() - mDisplayFreezeTime);
        StringBuilder sb = new StringBuilder(128);
        sb.append("Screen frozen for ");
        TimeUtils.formatDuration(mLastDisplayFreezeDuration, sb);
        if (mLastFinishedFreezeSource != null) {
            sb.append(" due to ");
            sb.append(mLastFinishedFreezeSource);
        }
        Slog.i(TAG, sb.toString());
        mH.removeMessages(H.APP_FREEZE_TIMEOUT);
        mH.removeMessages(H.CLIENT_FREEZE_TIMEOUT);
        if (PROFILE_ORIENTATION) {
            Debug.stopMethodTracing();
        }

        boolean updateRotation = false;

        final DisplayContent displayContent = getDefaultDisplayContentLocked();
        final int displayId = displayContent.getDisplayId();
        ScreenRotationAnimation screenRotationAnimation =
                mAnimator.getScreenRotationAnimationLocked(displayId);
        if (CUSTOM_SCREEN_ROTATION && screenRotationAnimation != null
                && screenRotationAnimation.hasScreenshot()) {
            if (DEBUG_ORIENTATION) Slog.i(TAG, "**** Dismissing screen rotation animation");
            // TODO(multidisplay): rotation on main screen only.
            DisplayInfo displayInfo = displayContent.getDisplayInfo();
            // Get rotation animation again, with new top window
            boolean isDimming = displayContent.isDimming();
            if (!mPolicy.validateRotationAnimationLw(mExitAnimId, mEnterAnimId, isDimming)) {
                mExitAnimId = mEnterAnimId = 0;
            }
            if (screenRotationAnimation.dismiss(mFxSession, MAX_ANIMATION_DURATION,
                    getTransitionAnimationScaleLocked(), displayInfo.logicalWidth,
                        displayInfo.logicalHeight, mExitAnimId, mEnterAnimId)) {
                scheduleAnimationLocked();
            } else {
                screenRotationAnimation.kill();
                screenRotationAnimation = null;
                mAnimator.setScreenRotationAnimationLocked(displayId, screenRotationAnimation);
                updateRotation = true;
            }
        } else {
            if (screenRotationAnimation != null) {
                screenRotationAnimation.kill();
                screenRotationAnimation = null;
                mAnimator.setScreenRotationAnimationLocked(displayId, screenRotationAnimation);
            }
            updateRotation = true;
        }

        mInputMonitor.thawInputDispatchingLw();

        boolean configChanged;

        // While the display is frozen we don't re-compute the orientation
        // to avoid inconsistent states.  However, something interesting
        // could have actually changed during that time so re-evaluate it
        // now to catch that.
        configChanged = updateOrientationFromAppTokensLocked(false);

        // A little kludge: a lot could have happened while the
        // display was frozen, so now that we are coming back we
        // do a gc so that any remote references the system
        // processes holds on others can be released if they are
        // no longer needed.
        mH.removeMessages(H.FORCE_GC);
        mH.sendEmptyMessageDelayed(H.FORCE_GC, 2000);

        mScreenFrozenLock.release();

        if (updateRotation) {
            if (DEBUG_ORIENTATION) Slog.d(TAG, "Performing post-rotate rotation");
            configChanged |= updateRotationUncheckedLocked(false);
        }

        if (configChanged) {
            mH.sendEmptyMessage(H.SEND_NEW_CONFIGURATION);
        }
    }

    static int getPropertyInt(String[] tokens, int index, int defUnits, int defDps,
            DisplayMetrics dm) {
        if (index < tokens.length) {
            String str = tokens[index];
            if (str != null && str.length() > 0) {
                try {
                    int val = Integer.parseInt(str);
                    return val;
                } catch (Exception e) {
                }
            }
        }
        if (defUnits == TypedValue.COMPLEX_UNIT_PX) {
            return defDps;
        }
        int val = (int)TypedValue.applyDimension(defUnits, defDps, dm);
        return val;
    }

    void createWatermarkInTransaction() {
        if (mWatermark != null) {
            return;
        }

        File file = new File("/system/etc/setup.conf");
        FileInputStream in = null;
        DataInputStream ind = null;
        try {
            in = new FileInputStream(file);
            ind = new DataInputStream(in);
            String line = ind.readLine();
            if (line != null) {
                String[] toks = line.split("%");
                if (toks != null && toks.length > 0) {
                    mWatermark = new Watermark(getDefaultDisplayContentLocked().getDisplay(),
                            mRealDisplayMetrics, mFxSession, toks);
                }
            }
        } catch (FileNotFoundException e) {
        } catch (IOException e) {
        } finally {
            if (ind != null) {
                try {
                    ind.close();
                } catch (IOException e) {
                }
            } else if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                }
            }
        }
    }

    @Override
    public void statusBarVisibilityChanged(int visibility) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.STATUS_BAR)
                != PackageManager.PERMISSION_GRANTED) {
            throw new SecurityException("Caller does not hold permission "
                    + android.Manifest.permission.STATUS_BAR);
        }

        synchronized (mWindowMap) {
            mLastStatusBarVisibility = visibility;
            visibility = mPolicy.adjustSystemUiVisibilityLw(visibility);
            updateStatusBarVisibilityLocked(visibility);
        }
    }

    // TOOD(multidisplay): StatusBar on multiple screens?
    void updateStatusBarVisibilityLocked(int visibility) {
        mInputManager.setSystemUiVisibility(visibility);
        final WindowList windows = getDefaultWindowListLocked();
        final int N = windows.size();
        for (int i = 0; i < N; i++) {
            WindowState ws = windows.get(i);
            try {
                int curValue = ws.mSystemUiVisibility;
                int diff = curValue ^ visibility;
                // We are only interested in differences of one of the
                // clearable flags...
                diff &= View.SYSTEM_UI_CLEARABLE_FLAGS;
                // ...if it has actually been cleared.
                diff &= ~visibility;
                int newValue = (curValue&~diff) | (visibility&diff);
                if (newValue != curValue) {
                    ws.mSeq++;
                    ws.mSystemUiVisibility = newValue;
                }
                if (newValue != curValue || ws.mAttrs.hasSystemUiListeners) {
                    ws.mClient.dispatchSystemUiVisibilityChanged(ws.mSeq,
                            visibility, newValue, diff);
                }
            } catch (RemoteException e) {
                // so sorry
            }
        }
    }

    @Override
    public void reevaluateStatusBarVisibility() {
        synchronized (mWindowMap) {
            int visibility = mPolicy.adjustSystemUiVisibilityLw(mLastStatusBarVisibility);
            updateStatusBarVisibilityLocked(visibility);
            performLayoutAndPlaceSurfacesLocked();
        }
    }

    @Override
    public FakeWindow addFakeWindow(Looper looper,
            InputEventReceiver.Factory inputEventReceiverFactory,
            String name, int windowType, int layoutParamsFlags, int layoutParamsPrivateFlags,
            boolean canReceiveKeys, boolean hasFocus, boolean touchFullscreen) {
        synchronized (mWindowMap) {
            FakeWindowImpl fw = new FakeWindowImpl(this, looper, inputEventReceiverFactory,
                    name, windowType,
                    layoutParamsFlags, layoutParamsPrivateFlags, canReceiveKeys,
                    hasFocus, touchFullscreen);
            int i=0;
            while (i<mFakeWindows.size()) {
                if (mFakeWindows.get(i).mWindowLayer <= fw.mWindowLayer) {
                    break;
                }
            }
            mFakeWindows.add(i, fw);
            mInputMonitor.updateInputWindowsLw(true);
            return fw;
        }
    }

    boolean removeFakeWindowLocked(FakeWindow window) {
        synchronized (mWindowMap) {
            if (mFakeWindows.remove(window)) {
                mInputMonitor.updateInputWindowsLw(true);
                return true;
            }
            return false;
        }
    }

    // It is assumed that this method is called only by InputMethodManagerService.
    public void saveLastInputMethodWindowForTransition() {
        synchronized (mWindowMap) {
            // TODO(multidisplay): Pass in the displayID.
            DisplayContent displayContent = getDefaultDisplayContentLocked();
            if (mInputMethodWindow != null) {
                mPolicy.setLastInputMethodWindowLw(mInputMethodWindow, mInputMethodTarget);
            }
        }
    }

    public int getInputMethodWindowVisibleHeight() {
        synchronized (mWindowMap) {
            return mPolicy.getInputMethodWindowVisibleHeightLw();
        }
    }

    @Override
    public boolean hasNavigationBar() {
        return mPolicy.hasNavigationBar();
    }

    @Override
    public void lockNow(Bundle options) {
        mPolicy.lockNow(options);
    }

    public void showRecentApps() {
        mPolicy.showRecentApps();
    }

    @Override
    public boolean isSafeModeEnabled() {
        return mSafeMode;
    }

    @Override
    public boolean clearWindowContentFrameStats(IBinder token) {
        if (!checkCallingPermission(Manifest.permission.FRAME_STATS,
                "clearWindowContentFrameStats()")) {
            throw new SecurityException("Requires FRAME_STATS permission");
        }
        synchronized (mWindowMap) {
            WindowState windowState = mWindowMap.get(token);
            if (windowState == null) {
                return false;
            }
            SurfaceControl surfaceControl = windowState.mWinAnimator.mSurfaceControl;
            if (surfaceControl == null) {
                return false;
            }
            return surfaceControl.clearContentFrameStats();
        }
    }

    @Override
    public WindowContentFrameStats getWindowContentFrameStats(IBinder token) {
        if (!checkCallingPermission(Manifest.permission.FRAME_STATS,
                "getWindowContentFrameStats()")) {
            throw new SecurityException("Requires FRAME_STATS permission");
        }
        synchronized (mWindowMap) {
            WindowState windowState = mWindowMap.get(token);
            if (windowState == null) {
                return null;
            }
            SurfaceControl surfaceControl = windowState.mWinAnimator.mSurfaceControl;
            if (surfaceControl == null) {
                return null;
            }
            if (mTempWindowRenderStats == null) {
                mTempWindowRenderStats = new WindowContentFrameStats();
            }
            WindowContentFrameStats stats = mTempWindowRenderStats;
            if (!surfaceControl.getContentFrameStats(stats)) {
                return null;
            }
            return stats;
        }
    }

    void dumpPolicyLocked(PrintWriter pw, String[] args, boolean dumpAll) {
        pw.println("WINDOW MANAGER POLICY STATE (dumpsys window policy)");
        mPolicy.dump("    ", pw, args);
    }

    void dumpAnimatorLocked(PrintWriter pw, String[] args, boolean dumpAll) {
        pw.println("WINDOW MANAGER ANIMATOR STATE (dumpsys window animator)");
        mAnimator.dumpLocked(pw, "    ", dumpAll);
    }

    void dumpTokensLocked(PrintWriter pw, boolean dumpAll) {
        pw.println("WINDOW MANAGER TOKENS (dumpsys window tokens)");
        if (mTokenMap.size() > 0) {
            pw.println("  All tokens:");
            Iterator<WindowToken> it = mTokenMap.values().iterator();
            while (it.hasNext()) {
                WindowToken token = it.next();
                pw.print("  "); pw.print(token);
                if (dumpAll) {
                    pw.println(':');
                    token.dump(pw, "    ");
                } else {
                    pw.println();
                }
            }
        }
        if (mWallpaperTokens.size() > 0) {
            pw.println();
            pw.println("  Wallpaper tokens:");
            for (int i=mWallpaperTokens.size()-1; i>=0; i--) {
                WindowToken token = mWallpaperTokens.get(i);
                pw.print("  Wallpaper #"); pw.print(i);
                        pw.print(' '); pw.print(token);
                if (dumpAll) {
                    pw.println(':');
                    token.dump(pw, "    ");
                } else {
                    pw.println();
                }
            }
        }
        if (mFinishedStarting.size() > 0) {
            pw.println();
            pw.println("  Finishing start of application tokens:");
            for (int i=mFinishedStarting.size()-1; i>=0; i--) {
                WindowToken token = mFinishedStarting.get(i);
                pw.print("  Finished Starting #"); pw.print(i);
                        pw.print(' '); pw.print(token);
                if (dumpAll) {
                    pw.println(':');
                    token.dump(pw, "    ");
                } else {
                    pw.println();
                }
            }
        }
        if (mOpeningApps.size() > 0 || mClosingApps.size() > 0) {
            pw.println();
            if (mOpeningApps.size() > 0) {
                pw.print("  mOpeningApps="); pw.println(mOpeningApps);
            }
            if (mClosingApps.size() > 0) {
                pw.print("  mClosingApps="); pw.println(mClosingApps);
            }
        }
    }

    void dumpSessionsLocked(PrintWriter pw, boolean dumpAll) {
        pw.println("WINDOW MANAGER SESSIONS (dumpsys window sessions)");
        for (int i=0; i<mSessions.size(); i++) {
            Session s = mSessions.valueAt(i);
            pw.print("  Session "); pw.print(s); pw.println(':');
            s.dump(pw, "    ");
        }
    }

    void dumpDisplayContentsLocked(PrintWriter pw, boolean dumpAll) {
        pw.println("WINDOW MANAGER DISPLAY CONTENTS (dumpsys window displays)");
        if (mDisplayReady) {
            final int numDisplays = mDisplayContents.size();
            for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                final DisplayContent displayContent = mDisplayContents.valueAt(displayNdx);
                displayContent.dump("  ", pw);
            }
        } else {
            pw.println("  NO DISPLAY");
        }
    }

    void dumpWindowsLocked(PrintWriter pw, boolean dumpAll,
            ArrayList<WindowState> windows) {
        pw.println("WINDOW MANAGER WINDOWS (dumpsys window windows)");
        dumpWindowsNoHeaderLocked(pw, dumpAll, windows);
    }

    void dumpWindowsNoHeaderLocked(PrintWriter pw, boolean dumpAll,
            ArrayList<WindowState> windows) {
        final int numDisplays = mDisplayContents.size();
        for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
            final WindowList windowList = mDisplayContents.valueAt(displayNdx).getWindowList();
            for (int winNdx = windowList.size() - 1; winNdx >= 0; --winNdx) {
                final WindowState w = windowList.get(winNdx);
                if (windows == null || windows.contains(w)) {
                    pw.print("  Window #"); pw.print(winNdx); pw.print(' ');
                            pw.print(w); pw.println(":");
                    w.dump(pw, "    ", dumpAll || windows != null);
                }
            }
        }
        if (mInputMethodDialogs.size() > 0) {
            pw.println();
            pw.println("  Input method dialogs:");
            for (int i=mInputMethodDialogs.size()-1; i>=0; i--) {
                WindowState w = mInputMethodDialogs.get(i);
                if (windows == null || windows.contains(w)) {
                    pw.print("  IM Dialog #"); pw.print(i); pw.print(": "); pw.println(w);
                }
            }
        }
        if (mPendingRemove.size() > 0) {
            pw.println();
            pw.println("  Remove pending for:");
            for (int i=mPendingRemove.size()-1; i>=0; i--) {
                WindowState w = mPendingRemove.get(i);
                if (windows == null || windows.contains(w)) {
                    pw.print("  Remove #"); pw.print(i); pw.print(' ');
                            pw.print(w);
                    if (dumpAll) {
                        pw.println(":");
                        w.dump(pw, "    ", true);
                    } else {
                        pw.println();
                    }
                }
            }
        }
        if (mForceRemoves != null && mForceRemoves.size() > 0) {
            pw.println();
            pw.println("  Windows force removing:");
            for (int i=mForceRemoves.size()-1; i>=0; i--) {
                WindowState w = mForceRemoves.get(i);
                pw.print("  Removing #"); pw.print(i); pw.print(' ');
                        pw.print(w);
                if (dumpAll) {
                    pw.println(":");
                    w.dump(pw, "    ", true);
                } else {
                    pw.println();
                }
            }
        }
        if (mDestroySurface.size() > 0) {
            pw.println();
            pw.println("  Windows waiting to destroy their surface:");
            for (int i=mDestroySurface.size()-1; i>=0; i--) {
                WindowState w = mDestroySurface.get(i);
                if (windows == null || windows.contains(w)) {
                    pw.print("  Destroy #"); pw.print(i); pw.print(' ');
                            pw.print(w);
                    if (dumpAll) {
                        pw.println(":");
                        w.dump(pw, "    ", true);
                    } else {
                        pw.println();
                    }
                }
            }
        }
        if (mLosingFocus.size() > 0) {
            pw.println();
            pw.println("  Windows losing focus:");
            for (int i=mLosingFocus.size()-1; i>=0; i--) {
                WindowState w = mLosingFocus.get(i);
                if (windows == null || windows.contains(w)) {
                    pw.print("  Losing #"); pw.print(i); pw.print(' ');
                            pw.print(w);
                    if (dumpAll) {
                        pw.println(":");
                        w.dump(pw, "    ", true);
                    } else {
                        pw.println();
                    }
                }
            }
        }
        if (mResizingWindows.size() > 0) {
            pw.println();
            pw.println("  Windows waiting to resize:");
            for (int i=mResizingWindows.size()-1; i>=0; i--) {
                WindowState w = mResizingWindows.get(i);
                if (windows == null || windows.contains(w)) {
                    pw.print("  Resizing #"); pw.print(i); pw.print(' ');
                            pw.print(w);
                    if (dumpAll) {
                        pw.println(":");
                        w.dump(pw, "    ", true);
                    } else {
                        pw.println();
                    }
                }
            }
        }
        if (mWaitingForDrawn.size() > 0) {
            pw.println();
            pw.println("  Clients waiting for these windows to be drawn:");
            for (int i=mWaitingForDrawn.size()-1; i>=0; i--) {
                WindowState win = mWaitingForDrawn.get(i);
                pw.print("  Waiting #"); pw.print(i); pw.print(' '); pw.print(win);
            }
        }
        pw.println();
        pw.print("  mCurConfiguration="); pw.println(this.mCurConfiguration);
        pw.print("  mCurrentFocus="); pw.println(mCurrentFocus);
        if (mLastFocus != mCurrentFocus) {
            pw.print("  mLastFocus="); pw.println(mLastFocus);
        }
        pw.print("  mFocusedApp="); pw.println(mFocusedApp);
        if (mInputMethodTarget != null) {
            pw.print("  mInputMethodTarget="); pw.println(mInputMethodTarget);
        }
        pw.print("  mInTouchMode="); pw.print(mInTouchMode);
                pw.print(" mLayoutSeq="); pw.println(mLayoutSeq);
        pw.print("  mLastDisplayFreezeDuration=");
                TimeUtils.formatDuration(mLastDisplayFreezeDuration, pw);
                if ( mLastFinishedFreezeSource != null) {
                    pw.print(" due to ");
                    pw.print(mLastFinishedFreezeSource);
                }
                pw.println();
        if (dumpAll) {
            pw.print("  mSystemDecorLayer="); pw.print(mSystemDecorLayer);
                    pw.print(" mScreenRect="); pw.println(mScreenRect.toShortString());
            if (mLastStatusBarVisibility != 0) {
                pw.print("  mLastStatusBarVisibility=0x");
                        pw.println(Integer.toHexString(mLastStatusBarVisibility));
            }
            if (mInputMethodWindow != null) {
                pw.print("  mInputMethodWindow="); pw.println(mInputMethodWindow);
            }
            pw.print("  mWallpaperTarget="); pw.println(mWallpaperTarget);
            if (mLowerWallpaperTarget != null || mUpperWallpaperTarget != null) {
                pw.print("  mLowerWallpaperTarget="); pw.println(mLowerWallpaperTarget);
                pw.print("  mUpperWallpaperTarget="); pw.println(mUpperWallpaperTarget);
            }
            pw.print("  mLastWallpaperX="); pw.print(mLastWallpaperX);
                    pw.print(" mLastWallpaperY="); pw.println(mLastWallpaperY);
            if (mLastWallpaperDisplayOffsetX != Integer.MIN_VALUE
                    || mLastWallpaperDisplayOffsetY != Integer.MIN_VALUE) {
                pw.print("  mLastWallpaperDisplayOffsetX="); pw.print(mLastWallpaperDisplayOffsetX);
                        pw.print(" mLastWallpaperDisplayOffsetY=");
                        pw.println(mLastWallpaperDisplayOffsetY);
            }
            if (mInputMethodAnimLayerAdjustment != 0 ||
                    mWallpaperAnimLayerAdjustment != 0) {
                pw.print("  mInputMethodAnimLayerAdjustment=");
                        pw.print(mInputMethodAnimLayerAdjustment);
                        pw.print("  mWallpaperAnimLayerAdjustment=");
                        pw.println(mWallpaperAnimLayerAdjustment);
            }
            pw.print("  mSystemBooted="); pw.print(mSystemBooted);
                    pw.print(" mDisplayEnabled="); pw.println(mDisplayEnabled);
            if (needsLayout()) {
                pw.print("  layoutNeeded on displays=");
                for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                    final DisplayContent displayContent = mDisplayContents.valueAt(displayNdx);
                    if (displayContent.layoutNeeded) {
                        pw.print(displayContent.getDisplayId());
                    }
                }
                pw.println();
            }
            pw.print("  mTransactionSequence="); pw.println(mTransactionSequence);
            pw.print("  mDisplayFrozen="); pw.print(mDisplayFrozen);
                    pw.print(" windows="); pw.print(mWindowsFreezingScreen);
                    pw.print(" client="); pw.print(mClientFreezingScreen);
                    pw.print(" apps="); pw.print(mAppsFreezingScreen);
                    pw.print(" waitingForConfig="); pw.println(mWaitingForConfig);
            pw.print("  mRotation="); pw.print(mRotation);
                    pw.print(" mAltOrientation="); pw.println(mAltOrientation);
            pw.print("  mLastWindowForcedOrientation="); pw.print(mLastWindowForcedOrientation);
                    pw.print(" mForcedAppOrientation="); pw.println(mForcedAppOrientation);
            pw.print("  mDeferredRotationPauseCount="); pw.println(mDeferredRotationPauseCount);
            pw.print("  Animation settings: disabled="); pw.print(mAnimationsDisabled);
                    pw.print(" window="); pw.print(mWindowAnimationScaleSetting);
                    pw.print(" transition="); pw.print(mTransitionAnimationScaleSetting);
                    pw.print(" animator="); pw.println(mAnimatorDurationScaleSetting);
            pw.print("  mTraversalScheduled="); pw.println(mTraversalScheduled);
            pw.print("  mStartingIconInTransition="); pw.print(mStartingIconInTransition);
                    pw.print(" mSkipAppTransitionAnimation="); pw.println(mSkipAppTransitionAnimation);
            pw.println("  mLayoutToAnim:");
            mAppTransition.dump(pw);
        }
    }

    boolean dumpWindows(PrintWriter pw, String name, String[] args,
            int opti, boolean dumpAll) {
        WindowList windows = new WindowList();
        if ("visible".equals(name)) {
            synchronized(mWindowMap) {
                final int numDisplays = mDisplayContents.size();
                for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                    final WindowList windowList =
                            mDisplayContents.valueAt(displayNdx).getWindowList();
                    for (int winNdx = windowList.size() - 1; winNdx >= 0; --winNdx) {
                        final WindowState w = windowList.get(winNdx);
                        if (w.mWinAnimator.mSurfaceShown) {
                            windows.add(w);
                        }
                    }
                }
            }
        } else {
            int objectId = 0;
            // See if this is an object ID.
            try {
                objectId = Integer.parseInt(name, 16);
                name = null;
            } catch (RuntimeException e) {
            }
            synchronized(mWindowMap) {
                final int numDisplays = mDisplayContents.size();
                for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) {
                    final WindowList windowList =
                            mDisplayContents.valueAt(displayNdx).getWindowList();
                    for (int winNdx = windowList.size() - 1; winNdx >= 0; --winNdx) {
                        final WindowState w = windowList.get(winNdx);
                        if (name != null) {
                            if (w.mAttrs.getTitle().toString().contains(name)) {
                                windows.add(w);
                            }
                        } else if (System.identityHashCode(w) == objectId) {
                            windows.add(w);
                        }
                    }
                }
            }
        }

        if (windows.size() <= 0) {
            return false;
        }

        synchronized(mWindowMap) {
            dumpWindowsLocked(pw, dumpAll, windows);
        }
        return true;
    }

    void dumpLastANRLocked(PrintWriter pw) {
        pw.println("WINDOW MANAGER LAST ANR (dumpsys window lastanr)");
        if (mLastANRState == null) {
            pw.println("  <no ANR has occurred since boot>");
        } else {
            pw.println(mLastANRState);
        }
    }

    /**
     * Saves information about the state of the window manager at
     * the time an ANR occurred before anything else in the system changes
     * in response.
     *
     * @param appWindowToken The application that ANR'd, may be null.
     * @param windowState The window that ANR'd, may be null.
     * @param reason The reason for the ANR, may be null.
     */
    public void saveANRStateLocked(AppWindowToken appWindowToken, WindowState windowState,
            String reason) {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new FastPrintWriter(sw, false, 1024);
        pw.println("  ANR time: " + DateFormat.getInstance().format(new Date()));
        if (appWindowToken != null) {
            pw.println("  Application at fault: " + appWindowToken.stringName);
        }
        if (windowState != null) {
            pw.println("  Window at fault: " + windowState.mAttrs.getTitle());
        }
        if (reason != null) {
            pw.println("  Reason: " + reason);
        }
        pw.println();
        dumpWindowsNoHeaderLocked(pw, true, null);
        pw.close();
        mLastANRState = sw.toString();
    }

    @Override
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        if (mContext.checkCallingOrSelfPermission("android.permission.DUMP")
                != PackageManager.PERMISSION_GRANTED) {
            pw.println("Permission Denial: can't dump WindowManager from from pid="
                    + Binder.getCallingPid()
                    + ", uid=" + Binder.getCallingUid());
            return;
        }

        boolean dumpAll = false;

        int opti = 0;
        while (opti < args.length) {
            String opt = args[opti];
            if (opt == null || opt.length() <= 0 || opt.charAt(0) != '-') {
                break;
            }
            opti++;
            if ("-a".equals(opt)) {
                dumpAll = true;
            } else if ("-h".equals(opt)) {
                pw.println("Window manager dump options:");
                pw.println("  [-a] [-h] [cmd] ...");
                pw.println("  cmd may be one of:");
                pw.println("    l[astanr]: last ANR information");
                pw.println("    p[policy]: policy state");
                pw.println("    a[animator]: animator state");
                pw.println("    s[essions]: active sessions");
                pw.println("    d[isplays]: active display contents");
                pw.println("    t[okens]: token list");
                pw.println("    w[indows]: window list");
                pw.println("  cmd may also be a NAME to dump windows.  NAME may");
                pw.println("    be a partial substring in a window name, a");
                pw.println("    Window hex object identifier, or");
                pw.println("    \"all\" for all windows, or");
                pw.println("    \"visible\" for the visible windows.");
                pw.println("  -a: include all available server state.");
                return;
            } else {
                pw.println("Unknown argument: " + opt + "; use -h for help");
            }
        }

        // Is the caller requesting to dump a particular piece of data?
        if (opti < args.length) {
            String cmd = args[opti];
            opti++;
            if ("lastanr".equals(cmd) || "l".equals(cmd)) {
                synchronized(mWindowMap) {
                    dumpLastANRLocked(pw);
                }
                return;
            } else if ("policy".equals(cmd) || "p".equals(cmd)) {
                synchronized(mWindowMap) {
                    dumpPolicyLocked(pw, args, true);
                }
                return;
            } else if ("animator".equals(cmd) || "a".equals(cmd)) {
                synchronized(mWindowMap) {
                    dumpAnimatorLocked(pw, args, true);
                }
                return;
            } else if ("sessions".equals(cmd) || "s".equals(cmd)) {
                synchronized(mWindowMap) {
                    dumpSessionsLocked(pw, true);
                }
                return;
            } else if ("displays".equals(cmd) || "d".equals(cmd)) {
                synchronized(mWindowMap) {
                    dumpDisplayContentsLocked(pw, true);
                }
                return;
            } else if ("tokens".equals(cmd) || "t".equals(cmd)) {
                synchronized(mWindowMap) {
                    dumpTokensLocked(pw, true);
                }
                return;
            } else if ("windows".equals(cmd) || "w".equals(cmd)) {
                synchronized(mWindowMap) {
                    dumpWindowsLocked(pw, true, null);
                }
                return;
            } else if ("all".equals(cmd) || "a".equals(cmd)) {
                synchronized(mWindowMap) {
                    dumpWindowsLocked(pw, true, null);
                }
                return;
            } else {
                // Dumping a single name?
                if (!dumpWindows(pw, cmd, args, opti, dumpAll)) {
                    pw.println("Bad window command, or no windows match: " + cmd);
                    pw.println("Use -h for help.");
                }
                return;
            }
        }

        synchronized(mWindowMap) {
            pw.println();
            if (dumpAll) {
                pw.println("-------------------------------------------------------------------------------");
            }
            dumpLastANRLocked(pw);
            pw.println();
            if (dumpAll) {
                pw.println("-------------------------------------------------------------------------------");
            }
            dumpPolicyLocked(pw, args, dumpAll);
            pw.println();
            if (dumpAll) {
                pw.println("-------------------------------------------------------------------------------");
            }
            dumpAnimatorLocked(pw, args, dumpAll);
            pw.println();
            if (dumpAll) {
                pw.println("-------------------------------------------------------------------------------");
            }
            dumpSessionsLocked(pw, dumpAll);
            pw.println();
            if (dumpAll) {
                pw.println("-------------------------------------------------------------------------------");
            }
            dumpDisplayContentsLocked(pw, dumpAll);
            pw.println();
            if (dumpAll) {
                pw.println("-------------------------------------------------------------------------------");
            }
            dumpTokensLocked(pw, dumpAll);
            pw.println();
            if (dumpAll) {
                pw.println("-------------------------------------------------------------------------------");
            }
            dumpWindowsLocked(pw, dumpAll, null);
        }
    }

    // Called by the heartbeat to ensure locks are not held indefnitely (for deadlock detection).
    @Override
    public void monitor() {
        synchronized (mWindowMap) { }
    }

    public interface OnHardKeyboardStatusChangeListener {
        public void onHardKeyboardStatusChange(boolean available);
    }

    void debugLayoutRepeats(final String msg, int pendingLayoutChanges) {
        if (mLayoutRepeatCount >= LAYOUT_REPEAT_THRESHOLD) {
            Slog.v(TAG, "Layouts looping: " + msg + ", mPendingLayoutChanges = 0x" +
                    Integer.toHexString(pendingLayoutChanges));
        }
    }

    private DisplayContent newDisplayContentLocked(final Display display) {
        DisplayContent displayContent = new DisplayContent(display, this);
        final int displayId = display.getDisplayId();
        if (DEBUG_DISPLAY) Slog.v(TAG, "Adding display=" + display);
        mDisplayContents.put(displayId, displayContent);

        DisplayInfo displayInfo = displayContent.getDisplayInfo();
        final Rect rect = new Rect();
        mDisplaySettings.getOverscanLocked(displayInfo.name, rect);
        synchronized (displayContent.mDisplaySizeLock) {
            displayInfo.overscanLeft = rect.left;
            displayInfo.overscanTop = rect.top;
            displayInfo.overscanRight = rect.right;
            displayInfo.overscanBottom = rect.bottom;
            mDisplayManagerInternal.setDisplayInfoOverrideFromWindowManager(
                    displayId, displayInfo);
        }
        configureDisplayPolicyLocked(displayContent);

        // TODO: Create an input channel for each display with touch capability.
        if (displayId == Display.DEFAULT_DISPLAY) {
            displayContent.mTapDetector = new StackTapPointerEventListener(this, displayContent);
            registerPointerEventListener(displayContent.mTapDetector);
        }

        return displayContent;
    }

    public void createDisplayContentLocked(final Display display) {
        if (display == null) {
            throw new IllegalArgumentException("getDisplayContent: display must not be null");
        }
        getDisplayContentLocked(display.getDisplayId());
    }

    /**
     * Retrieve the DisplayContent for the specified displayId. Will create a new DisplayContent if
     * there is a Display for the displayId.
     * @param displayId The display the caller is interested in.
     * @return The DisplayContent associated with displayId or null if there is no Display for it.
     */
    public DisplayContent getDisplayContentLocked(final int displayId) {
        DisplayContent displayContent = mDisplayContents.get(displayId);
        if (displayContent == null) {
            final Display display = mDisplayManager.getDisplay(displayId);
            if (display != null) {
                displayContent = newDisplayContentLocked(display);
            }
        }
        return displayContent;
    }

    // There is an inherent assumption that this will never return null.
    public DisplayContent getDefaultDisplayContentLocked() {
        return getDisplayContentLocked(Display.DEFAULT_DISPLAY);
    }

    public WindowList getDefaultWindowListLocked() {
        return getDefaultDisplayContentLocked().getWindowList();
    }

    public DisplayInfo getDefaultDisplayInfoLocked() {
        return getDefaultDisplayContentLocked().getDisplayInfo();
    }

    /**
     * Return the list of WindowStates associated on the passed display.
     * @param display The screen to return windows from.
     * @return The list of WindowStates on the screen, or null if the there is no screen.
     */
    public WindowList getWindowListLocked(final Display display) {
        return getWindowListLocked(display.getDisplayId());
    }

    /**
     * Return the list of WindowStates associated on the passed display.
     * @param displayId The screen to return windows from.
     * @return The list of WindowStates on the screen, or null if the there is no screen.
     */
    public WindowList getWindowListLocked(final int displayId) {
        final DisplayContent displayContent = getDisplayContentLocked(displayId);
        return displayContent != null ? displayContent.getWindowList() : null;
    }

    public void onDisplayAdded(int displayId) {
        mH.sendMessage(mH.obtainMessage(H.DO_DISPLAY_ADDED, displayId, 0));
    }

    public void handleDisplayAdded(int displayId) {
        synchronized (mWindowMap) {
            final Display display = mDisplayManager.getDisplay(displayId);
            if (display != null) {
                createDisplayContentLocked(display);
                displayReady(displayId);
            }
        }
    }

    public void onDisplayRemoved(int displayId) {
        mH.sendMessage(mH.obtainMessage(H.DO_DISPLAY_REMOVED, displayId, 0));
    }

    private void handleDisplayRemovedLocked(int displayId) {
        final DisplayContent displayContent = getDisplayContentLocked(displayId);
        if (displayContent != null) {
            if (displayContent.isAnimating()) {
                displayContent.mDeferredRemoval = true;
                return;
            }
            if (DEBUG_DISPLAY) Slog.v(TAG, "Removing display=" + displayContent);
            mDisplayContents.delete(displayId);
            displayContent.close();
            if (displayId == Display.DEFAULT_DISPLAY) {
                unregisterPointerEventListener(displayContent.mTapDetector);
            }
        }
        mAnimator.removeDisplayLocked(displayId);
    }

    public void onDisplayChanged(int displayId) {
        mH.sendMessage(mH.obtainMessage(H.DO_DISPLAY_CHANGED, displayId, 0));
    }

    private void handleDisplayChangedLocked(int displayId) {
        final DisplayContent displayContent = getDisplayContentLocked(displayId);
        if (displayContent != null) {
            displayContent.updateDisplayInfo();
        }
    }

    @Override
    public Object getWindowManagerLock() {
        return mWindowMap;
    }

    private final class LocalService extends WindowManagerInternal {
        @Override
        public void requestTraversalFromDisplayManager() {
            requestTraversal();
        }

        @Override
        public void setMagnificationSpec(MagnificationSpec spec) {
            synchronized (mWindowMap) {
                if (mAccessibilityController != null) {
                    mAccessibilityController.setMagnificationSpecLocked(spec);
                } else {
                    throw new IllegalStateException("Magnification callbacks not set!");
                }
            }
            if (Binder.getCallingPid() != android.os.Process.myPid()) {
                spec.recycle();
            }
        }

        @Override
        public MagnificationSpec getCompatibleMagnificationSpecForWindow(IBinder windowToken) {
            synchronized (mWindowMap) {
                WindowState windowState = mWindowMap.get(windowToken);
                if (windowState == null) {
                    return null;
                }
                MagnificationSpec spec = null;
                if (mAccessibilityController != null) {
                    spec = mAccessibilityController.getMagnificationSpecForWindowLocked(windowState);
                }
                if ((spec == null || spec.isNop()) && windowState.mGlobalScale == 1.0f) {
                    return null;
                }
                spec = (spec == null) ? MagnificationSpec.obtain() : MagnificationSpec.obtain(spec);
                spec.scale *= windowState.mGlobalScale;
                return spec;
            }
        }

        @Override
        public void setMagnificationCallbacks(MagnificationCallbacks callbacks) {
            synchronized (mWindowMap) {
                if (mAccessibilityController == null) {
                    mAccessibilityController = new AccessibilityController(
                            WindowManagerService.this);
                }
                mAccessibilityController.setMagnificationCallbacksLocked(callbacks);
                if (!mAccessibilityController.hasCallbacksLocked()) {
                    mAccessibilityController = null;
                }
            }
        }

        @Override
        public void setWindowsForAccessibilityCallback(WindowsForAccessibilityCallback callback) {
            synchronized (mWindowMap) {
                if (mAccessibilityController == null) {
                    mAccessibilityController = new AccessibilityController(
                            WindowManagerService.this);
                }
                mAccessibilityController.setWindowsForAccessibilityCallback(callback);
                if (!mAccessibilityController.hasCallbacksLocked()) {
                    mAccessibilityController = null;
                }
            }
        }

        @Override
        public void setInputFilter(IInputFilter filter) {
            mInputManager.setInputFilter(filter);
        }

        @Override
        public IBinder getFocusedWindowToken() {
            synchronized (mWindowMap) {
                WindowState windowState = getFocusedWindowLocked();
                if (windowState != null) {
                    return windowState.mClient.asBinder();
                }
                return null;
            }
        }

        @Override
        public boolean isKeyguardLocked() {
            return WindowManagerService.this.isKeyguardLocked();
        }

        @Override
        public void showGlobalActions() {
            WindowManagerService.this.showGlobalActions();
        }

        @Override
        public void getWindowFrame(IBinder token, Rect outBounds) {
            synchronized (mWindowMap) {
                WindowState windowState = mWindowMap.get(token);
                if (windowState != null) {
                    outBounds.set(windowState.mFrame);
                } else {
                    outBounds.setEmpty();
                }
            }
        }

        public void waitForAllWindowsDrawn(Runnable callback, long timeout) {
            synchronized (mWindowMap) {
                mWaitingForDrawnCallback = callback;
                final WindowList windows = getDefaultWindowListLocked();
                for (int winNdx = windows.size() - 1; winNdx >= 0; --winNdx) {
                    final WindowState win = windows.get(winNdx);
                    if (win.mHasSurface
                            && (win.mAppToken != null || mPolicy.isForceHiding(win.mAttrs))) {
                        win.mWinAnimator.mDrawState = WindowStateAnimator.DRAW_PENDING;
                        // Force add to mResizingWindows.
                        win.mLastContentInsets.set(-1, -1, -1, -1);
                        mWaitingForDrawn.add(win);
                    }
                }
                requestTraversalLocked();
            }
            mH.removeMessages(H.WAITING_FOR_DRAWN_TIMEOUT);
            if (mWaitingForDrawn.isEmpty()) {
                callback.run();
            } else {
                mH.sendEmptyMessageDelayed(H.WAITING_FOR_DRAWN_TIMEOUT, timeout);
                checkDrawnWindowsLocked();
            }
        }
    }
}