LocalDisplayAdapter.java revision 037c33eae74bee2774897d969d48947f9abe254f 
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    private final class LocalDisplayDevice extends DisplayDevice {
100        private final int mBuiltInDisplayId;
101        private final SurfaceControl.PhysicalDisplayInfo mPhys;
102
103        private DisplayDeviceInfo mInfo;
104        private boolean mHavePendingChanges;
105        private int mState = Display.STATE_UNKNOWN;
106
107        public LocalDisplayDevice(IBinder displayToken, int builtInDisplayId,
108                SurfaceControl.PhysicalDisplayInfo phys) {
109            super(LocalDisplayAdapter.this, displayToken);
110            mBuiltInDisplayId = builtInDisplayId;
111            mPhys = new SurfaceControl.PhysicalDisplayInfo(phys);
112        }
113
114        public boolean updatePhysicalDisplayInfoLocked(SurfaceControl.PhysicalDisplayInfo phys) {
115            if (!mPhys.equals(phys)) {
116                mPhys.copyFrom(phys);
117                mHavePendingChanges = true;
118                return true;
119            }
120            return false;
121        }
122
123        @Override
124        public void applyPendingDisplayDeviceInfoChangesLocked() {
125            if (mHavePendingChanges) {
126                mInfo = null;
127                mHavePendingChanges = false;
128            }
129        }
130
131        @Override
132        public DisplayDeviceInfo getDisplayDeviceInfoLocked() {
133            if (mInfo == null) {
134                mInfo = new DisplayDeviceInfo();
135                mInfo.width = mPhys.width;
136                mInfo.height = mPhys.height;
137                mInfo.refreshRate = mPhys.refreshRate;
138                mInfo.state = mState;
139
140                // Assume that all built-in displays that have secure output (eg. HDCP) also
141                // support compositing from gralloc protected buffers.
142                if (mPhys.secure) {
143                    mInfo.flags = DisplayDeviceInfo.FLAG_SECURE
144                            | DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS;
145                }
146
147                if (mBuiltInDisplayId == SurfaceControl.BUILT_IN_DISPLAY_ID_MAIN) {
148                    mInfo.name = getContext().getResources().getString(
149                            com.android.internal.R.string.display_manager_built_in_display_name);
150                    mInfo.flags |= DisplayDeviceInfo.FLAG_DEFAULT_DISPLAY
151                            | DisplayDeviceInfo.FLAG_ROTATES_WITH_CONTENT;
152                    mInfo.type = Display.TYPE_BUILT_IN;
153                    mInfo.densityDpi = (int)(mPhys.density * 160 + 0.5f);
154                    mInfo.xDpi = mPhys.xDpi;
155                    mInfo.yDpi = mPhys.yDpi;
156                    mInfo.touch = DisplayDeviceInfo.TOUCH_INTERNAL;
157                } else {
158                    mInfo.type = Display.TYPE_HDMI;
159                    mInfo.flags |= DisplayDeviceInfo.FLAG_PRESENTATION;
160                    mInfo.name = getContext().getResources().getString(
161                            com.android.internal.R.string.display_manager_hdmi_display_name);
162                    mInfo.touch = DisplayDeviceInfo.TOUCH_EXTERNAL;
163                    mInfo.setAssumedDensityForExternalDisplay(mPhys.width, mPhys.height);
164
165                    // For demonstration purposes, allow rotation of the external display.
166                    // In the future we might allow the user to configure this directly.
167                    if ("portrait".equals(SystemProperties.get("persist.demo.hdmirotation"))) {
168                        mInfo.rotation = Surface.ROTATION_270;
169                    }
170                }
171            }
172            return mInfo;
173        }
174
175        @Override
176        public void requestDisplayStateLocked(int state) {
177            if (mState != state) {
178                if (state == Display.STATE_OFF && mState != Display.STATE_OFF) {
179                    SurfaceControl.blankDisplay(getDisplayTokenLocked());
180                } else if (state != Display.STATE_OFF && mState == Display.STATE_OFF) {
181                    SurfaceControl.unblankDisplay(getDisplayTokenLocked());
182                }
183                mState = state;
184                updateDeviceInfoLocked();
185            }
186        }
187
188        @Override
189        public void dumpLocked(PrintWriter pw) {
190            super.dumpLocked(pw);
191            pw.println("mBuiltInDisplayId=" + mBuiltInDisplayId);
192            pw.println("mPhys=" + mPhys);
193            pw.println("mState=" + Display.stateToString(mState));
194        }
195
196        private void updateDeviceInfoLocked() {
197            mInfo = null;
198            sendDisplayDeviceEventLocked(this, DISPLAY_DEVICE_EVENT_CHANGED);
199        }
200    }
201
202    private final class HotplugDisplayEventReceiver extends DisplayEventReceiver {
203        public HotplugDisplayEventReceiver(Looper looper) {
204            super(looper);
205        }
206
207        @Override
208        public void onHotplug(long timestampNanos, int builtInDisplayId, boolean connected) {
209            synchronized (getSyncRoot()) {
210                if (connected) {
211                    tryConnectDisplayLocked(builtInDisplayId);
212                } else {
213                    tryDisconnectDisplayLocked(builtInDisplayId);
214                }
215            }
216        }
217    }
218}