LocalDisplayAdapter.java revision 77aebfdbae489c3712ae3f9bca29d01fb1f09dc2 
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.util.SparseArray;
24import android.view.DisplayEventReceiver;
25import android.view.Surface;
26import android.view.Surface.PhysicalDisplayInfo;
27
28import java.io.PrintWriter;
29
30/**
31 * A display adapter for the local displays managed by Surface Flinger.
32 * <p>
33 * Display adapters are guarded by the {@link DisplayManagerService.SyncRoot} lock.
34 * </p>
35 */
36final class LocalDisplayAdapter extends DisplayAdapter {
37    private static final String TAG = "LocalDisplayAdapter";
38
39    private static final int[] BUILT_IN_DISPLAY_IDS_TO_SCAN = new int[] {
40            Surface.BUILT_IN_DISPLAY_ID_MAIN,
41            Surface.BUILT_IN_DISPLAY_ID_HDMI,
42    };
43
44    private final SparseArray<LocalDisplayDevice> mDevices =
45            new SparseArray<LocalDisplayDevice>();
46    private final HotplugDisplayEventReceiver mHotplugReceiver;
47
48    private final PhysicalDisplayInfo mTempPhys = new PhysicalDisplayInfo();
49
50    public LocalDisplayAdapter(DisplayManagerService.SyncRoot syncRoot,
51            Context context, Handler handler, Listener listener) {
52        super(syncRoot, context, handler, listener, TAG);
53        mHotplugReceiver = new HotplugDisplayEventReceiver(handler.getLooper());
54    }
55
56    @Override
57    public void registerLocked() {
58        // TODO: listen for notifications from Surface Flinger about
59        // built-in displays being added or removed and rescan as needed.
60        super.registerLocked();
61        scanDisplaysLocked();
62    }
63
64    private void scanDisplaysLocked() {
65        for (int builtInDisplayId : BUILT_IN_DISPLAY_IDS_TO_SCAN) {
66            IBinder displayToken = Surface.getBuiltInDisplay(builtInDisplayId);
67            if (displayToken != null && Surface.getDisplayInfo(displayToken, mTempPhys)) {
68                LocalDisplayDevice device = mDevices.get(builtInDisplayId);
69                if (device == null) {
70                    // Display was added.
71                    device = new LocalDisplayDevice(displayToken, builtInDisplayId, mTempPhys);
72                    mDevices.put(builtInDisplayId, device);
73                    sendDisplayDeviceEventLocked(device, DISPLAY_DEVICE_EVENT_ADDED);
74                } else if (device.updatePhysicalDisplayInfoLocked(mTempPhys)) {
75                    // Display properties changed.
76                    sendDisplayDeviceEventLocked(device, DISPLAY_DEVICE_EVENT_CHANGED);
77                }
78            } else {
79                LocalDisplayDevice device = mDevices.get(builtInDisplayId);
80                if (device != null) {
81                    // Display was removed.
82                    mDevices.remove(builtInDisplayId);
83                    sendDisplayDeviceEventLocked(device, DISPLAY_DEVICE_EVENT_REMOVED);
84                }
85            }
86        }
87    }
88
89    private final class LocalDisplayDevice extends DisplayDevice {
90        private final int mBuiltInDisplayId;
91        private final PhysicalDisplayInfo mPhys;
92
93        private DisplayDeviceInfo mInfo;
94        private boolean mHavePendingChanges;
95
96        public LocalDisplayDevice(IBinder displayToken, int builtInDisplayId,
97                PhysicalDisplayInfo phys) {
98            super(LocalDisplayAdapter.this, displayToken);
99            mBuiltInDisplayId = builtInDisplayId;
100            mPhys = new PhysicalDisplayInfo(phys);
101        }
102
103        public boolean updatePhysicalDisplayInfoLocked(PhysicalDisplayInfo phys) {
104            if (!mPhys.equals(phys)) {
105                mPhys.copyFrom(phys);
106                mHavePendingChanges = true;
107                return true;
108            }
109            return false;
110        }
111
112        @Override
113        public void applyPendingDisplayDeviceInfoChangesLocked() {
114            if (mHavePendingChanges) {
115                mInfo = null;
116                mHavePendingChanges = false;
117            }
118        }
119
120        @Override
121        public DisplayDeviceInfo getDisplayDeviceInfoLocked() {
122            if (mInfo == null) {
123                mInfo = new DisplayDeviceInfo();
124                mInfo.width = mPhys.width;
125                mInfo.height = mPhys.height;
126                mInfo.refreshRate = mPhys.refreshRate;
127
128                // Assume that all built-in displays have secure output (eg. HDCP) and
129                // support compositing from gralloc protected buffers.
130                mInfo.flags = DisplayDeviceInfo.FLAG_SECURE
131                        | DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS;
132
133                if (mBuiltInDisplayId == Surface.BUILT_IN_DISPLAY_ID_MAIN) {
134                    mInfo.name = getContext().getResources().getString(
135                            com.android.internal.R.string.display_manager_built_in_display_name);
136                    mInfo.flags |= DisplayDeviceInfo.FLAG_DEFAULT_DISPLAY
137                            | DisplayDeviceInfo.FLAG_SUPPORTS_ROTATION;
138                    mInfo.densityDpi = (int)(mPhys.density * 160 + 0.5f);
139                    mInfo.xDpi = mPhys.xDpi;
140                    mInfo.yDpi = mPhys.yDpi;
141                    mInfo.touch = DisplayDeviceInfo.TOUCH_INTERNAL;
142                } else {
143                    mInfo.name = getContext().getResources().getString(
144                            com.android.internal.R.string.display_manager_hdmi_display_name);
145                    mInfo.touch = DisplayDeviceInfo.TOUCH_EXTERNAL;
146                    mInfo.setAssumedDensityForExternalDisplay(mPhys.width, mPhys.height);
147                }
148            }
149            return mInfo;
150        }
151
152        @Override
153        public void dumpLocked(PrintWriter pw) {
154            super.dumpLocked(pw);
155            pw.println("mBuiltInDisplayId=" + mBuiltInDisplayId);
156            pw.println("mPhys=" + mPhys);
157        }
158    }
159
160    private final class HotplugDisplayEventReceiver extends DisplayEventReceiver {
161        public HotplugDisplayEventReceiver(Looper looper) {
162            super(looper);
163        }
164
165        @Override
166        public void onHotplug(long timestampNanos, int builtInDisplayId, boolean connected) {
167            synchronized (getSyncRoot()) {
168                scanDisplaysLocked();
169            }
170        }
171    }
172}