LocalDisplayAdapter.java revision 44b1f76474218349c9327da9fe482e19aad98795 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.server.display;
18
19import android.content.Context;
20import android.os.Handler;
21import android.os.IBinder;
22import android.os.Looper;
23import android.os.SystemProperties;
24import android.util.SparseArray;
25import android.view.Display;
26import android.view.DisplayEventReceiver;
27import android.view.Surface;
28import android.view.SurfaceControl;
29import android.view.SurfaceControl.PhysicalDisplayInfo;
30
31import java.io.PrintWriter;
32
33/**
34 * A display adapter for the local displays managed by Surface Flinger.
35 * <p>
36 * Display adapters are guarded by the {@link DisplayManagerService.SyncRoot} lock.
37 * </p>
38 */
39final class LocalDisplayAdapter extends DisplayAdapter {
40    private static final String TAG = "LocalDisplayAdapter";
41
42    private static final int[] BUILT_IN_DISPLAY_IDS_TO_SCAN = new int[] {
43            SurfaceControl.BUILT_IN_DISPLAY_ID_MAIN,
44            SurfaceControl.BUILT_IN_DISPLAY_ID_HDMI,
45    };
46
47    private final SparseArray<LocalDisplayDevice> mDevices =
48            new SparseArray<LocalDisplayDevice>();
49    private HotplugDisplayEventReceiver mHotplugReceiver;
50
51    private final SurfaceControl.PhysicalDisplayInfo mTempPhys = new SurfaceControl.PhysicalDisplayInfo();
52
53    // Called with SyncRoot lock held.
54    public LocalDisplayAdapter(DisplayManagerService.SyncRoot syncRoot,
55            Context context, Handler handler, Listener listener) {
56        super(syncRoot, context, handler, listener, TAG);
57    }
58
59    @Override
60    public void registerLocked() {
61        super.registerLocked();
62
63        mHotplugReceiver = new HotplugDisplayEventReceiver(getHandler().getLooper());
64
65        for (int builtInDisplayId : BUILT_IN_DISPLAY_IDS_TO_SCAN) {
66            tryConnectDisplayLocked(builtInDisplayId);
67        }
68    }
69
70    private void tryConnectDisplayLocked(int builtInDisplayId) {
71        IBinder displayToken = SurfaceControl.getBuiltInDisplay(builtInDisplayId);
72        if (displayToken != null && SurfaceControl.getDisplayInfo(displayToken, mTempPhys)) {
73            LocalDisplayDevice device = mDevices.get(builtInDisplayId);
74            if (device == null) {
75                // Display was added.
76                device = new LocalDisplayDevice(displayToken, builtInDisplayId, mTempPhys);
77                mDevices.put(builtInDisplayId, device);
78                sendDisplayDeviceEventLocked(device, DISPLAY_DEVICE_EVENT_ADDED);
79            } else if (device.updatePhysicalDisplayInfoLocked(mTempPhys)) {
80                // Display properties changed.
81                sendDisplayDeviceEventLocked(device, DISPLAY_DEVICE_EVENT_CHANGED);
82            }
83        } else {
84            // The display is no longer available. Ignore the attempt to add it.
85            // If it was connected but has already been disconnected, we'll get a
86            // disconnect event that will remove it from mDevices.
87        }
88    }
89
90    private void tryDisconnectDisplayLocked(int builtInDisplayId) {
91        LocalDisplayDevice device = mDevices.get(builtInDisplayId);
92        if (device != null) {
93            // Display was removed.
94            mDevices.remove(builtInDisplayId);
95            sendDisplayDeviceEventLocked(device, DISPLAY_DEVICE_EVENT_REMOVED);
96        }
97    }
98
99    static boolean shouldBlank(int state) {
100        return state == Display.STATE_OFF;
101    }
102
103    static boolean shouldUnblank(int state) {
104        return state == Display.STATE_ON || state == Display.STATE_DOZING;
105    }
106
107    private final class LocalDisplayDevice extends DisplayDevice {
108        private final int mBuiltInDisplayId;
109        private final SurfaceControl.PhysicalDisplayInfo mPhys;
110
111        private DisplayDeviceInfo mInfo;
112        private boolean mHavePendingChanges;
113        private int mState = Display.STATE_UNKNOWN;
114
115        public LocalDisplayDevice(IBinder displayToken, int builtInDisplayId,
116                SurfaceControl.PhysicalDisplayInfo phys) {
117            super(LocalDisplayAdapter.this, displayToken);
118            mBuiltInDisplayId = builtInDisplayId;
119            mPhys = new SurfaceControl.PhysicalDisplayInfo(phys);
120        }
121
122        public boolean updatePhysicalDisplayInfoLocked(SurfaceControl.PhysicalDisplayInfo phys) {
123            if (!mPhys.equals(phys)) {
124                mPhys.copyFrom(phys);
125                mHavePendingChanges = true;
126                return true;
127            }
128            return false;
129        }
130
131        @Override
132        public void applyPendingDisplayDeviceInfoChangesLocked() {
133            if (mHavePendingChanges) {
134                mInfo = null;
135                mHavePendingChanges = false;
136            }
137        }
138
139        @Override
140        public DisplayDeviceInfo getDisplayDeviceInfoLocked() {
141            if (mInfo == null) {
142                mInfo = new DisplayDeviceInfo();
143                mInfo.width = mPhys.width;
144                mInfo.height = mPhys.height;
145                mInfo.refreshRate = mPhys.refreshRate;
146                mInfo.state = mState;
147
148                // Assume that all built-in displays that have secure output (eg. HDCP) also
149                // support compositing from gralloc protected buffers.
150                if (mPhys.secure) {
151                    mInfo.flags = DisplayDeviceInfo.FLAG_SECURE
152                            | DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS;
153                }
154
155                if (mBuiltInDisplayId == SurfaceControl.BUILT_IN_DISPLAY_ID_MAIN) {
156                    mInfo.name = getContext().getResources().getString(
157                            com.android.internal.R.string.display_manager_built_in_display_name);
158                    mInfo.flags |= DisplayDeviceInfo.FLAG_DEFAULT_DISPLAY
159                            | DisplayDeviceInfo.FLAG_ROTATES_WITH_CONTENT;
160                    mInfo.type = Display.TYPE_BUILT_IN;
161                    mInfo.densityDpi = (int)(mPhys.density * 160 + 0.5f);
162                    mInfo.xDpi = mPhys.xDpi;
163                    mInfo.yDpi = mPhys.yDpi;
164                    mInfo.touch = DisplayDeviceInfo.TOUCH_INTERNAL;
165                } else {
166                    mInfo.type = Display.TYPE_HDMI;
167                    mInfo.flags |= DisplayDeviceInfo.FLAG_PRESENTATION;
168                    mInfo.name = getContext().getResources().getString(
169                            com.android.internal.R.string.display_manager_hdmi_display_name);
170                    mInfo.touch = DisplayDeviceInfo.TOUCH_EXTERNAL;
171                    mInfo.setAssumedDensityForExternalDisplay(mPhys.width, mPhys.height);
172
173                    // For demonstration purposes, allow rotation of the external display.
174                    // In the future we might allow the user to configure this directly.
175                    if ("portrait".equals(SystemProperties.get("persist.demo.hdmirotation"))) {
176                        mInfo.rotation = Surface.ROTATION_270;
177                    }
178                }
179            }
180            return mInfo;
181        }
182
183        @Override
184        public void requestDisplayStateLocked(int state) {
185            if (mState != state) {
186                if (shouldBlank(state) && !shouldBlank(mState)) {
187                    SurfaceControl.blankDisplay(getDisplayTokenLocked());
188                } else if (shouldUnblank(state) && !shouldUnblank(mState)) {
189                    SurfaceControl.unblankDisplay(getDisplayTokenLocked());
190                }
191                mState = state;
192                updateDeviceInfoLocked();
193            }
194        }
195
196        @Override
197        public void dumpLocked(PrintWriter pw) {
198            super.dumpLocked(pw);
199            pw.println("mBuiltInDisplayId=" + mBuiltInDisplayId);
200            pw.println("mPhys=" + mPhys);
201            pw.println("mState=" + Display.stateToString(mState));
202        }
203
204        private void updateDeviceInfoLocked() {
205            mInfo = null;
206            sendDisplayDeviceEventLocked(this, DISPLAY_DEVICE_EVENT_CHANGED);
207        }
208    }
209
210    private final class HotplugDisplayEventReceiver extends DisplayEventReceiver {
211        public HotplugDisplayEventReceiver(Looper looper) {
212            super(looper);
213        }
214
215        @Override
216        public void onHotplug(long timestampNanos, int builtInDisplayId, boolean connected) {
217            synchronized (getSyncRoot()) {
218                if (connected) {
219                    tryConnectDisplayLocked(builtInDisplayId);
220                } else {
221                    tryDisconnectDisplayLocked(builtInDisplayId);
222                }
223            }
224        }
225    }
226}