HeadlessDisplayAdapter.java revision 66692500344cab2f53cdb6ee1545c567fff7cb16 
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.util.DisplayMetrics;
22
23/**
24 * Provides a fake default display for headless systems.
25 * <p>
26 * Display adapters are guarded by the {@link DisplayManagerService.SyncRoot} lock.
27 * </p>
28 */
29final class HeadlessDisplayAdapter extends DisplayAdapter {
30    private static final String TAG = "HeadlessDisplayAdapter";
31
32    // Called with SyncRoot lock held.
33    public HeadlessDisplayAdapter(DisplayManagerService.SyncRoot syncRoot,
34            Context context, Handler handler, Listener listener) {
35        super(syncRoot, context, handler, listener, TAG);
36    }
37
38    @Override
39    public void registerLocked() {
40        super.registerLocked();
41        sendDisplayDeviceEventLocked(new HeadlessDisplayDevice(), DISPLAY_DEVICE_EVENT_ADDED);
42    }
43
44    private final class HeadlessDisplayDevice extends DisplayDevice {
45        private DisplayDeviceInfo mInfo;
46
47        public HeadlessDisplayDevice() {
48            super(HeadlessDisplayAdapter.this, null);
49        }
50
51        @Override
52        public DisplayDeviceInfo getDisplayDeviceInfoLocked() {
53            if (mInfo == null) {
54                mInfo = new DisplayDeviceInfo();
55                mInfo.name = getContext().getResources().getString(
56                        com.android.internal.R.string.display_manager_built_in_display_name);
57                mInfo.width = 640;
58                mInfo.height = 480;
59                mInfo.refreshRate = 60;
60                mInfo.densityDpi = DisplayMetrics.DENSITY_DEFAULT;
61                mInfo.xDpi = 160;
62                mInfo.yDpi = 160;
63                mInfo.flags = DisplayDeviceInfo.FLAG_DEFAULT_DISPLAY
64                        | DisplayDeviceInfo.FLAG_SECURE
65                        | DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS;
66                mInfo.touch = DisplayDeviceInfo.TOUCH_NONE;
67            }
68            return mInfo;
69        }
70    }
71}
72