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      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 
     17 package com.android.server.display;
     18 
     19 import android.content.Context;
     20 import android.os.Handler;
     21 import android.util.DisplayMetrics;
     22 import android.view.Display;
     23 
     24 /**
     25  * Provides a fake default display for headless systems.
     26  * <p>
     27  * Display adapters are guarded by the {@link DisplayManagerService.SyncRoot} lock.
     28  * </p>
     29  */
     30 final class HeadlessDisplayAdapter extends DisplayAdapter {
     31     private static final String TAG = "HeadlessDisplayAdapter";
     32 
     33     // Called with SyncRoot lock held.
     34     public HeadlessDisplayAdapter(DisplayManagerService.SyncRoot syncRoot,
     35             Context context, Handler handler, Listener listener) {
     36         super(syncRoot, context, handler, listener, TAG);
     37     }
     38 
     39     @Override
     40     public void registerLocked() {
     41         super.registerLocked();
     42         sendDisplayDeviceEventLocked(new HeadlessDisplayDevice(), DISPLAY_DEVICE_EVENT_ADDED);
     43     }
     44 
     45     private final class HeadlessDisplayDevice extends DisplayDevice {
     46         private DisplayDeviceInfo mInfo;
     47 
     48         public HeadlessDisplayDevice() {
     49             super(HeadlessDisplayAdapter.this, null);
     50         }
     51 
     52         @Override
     53         public DisplayDeviceInfo getDisplayDeviceInfoLocked() {
     54             if (mInfo == null) {
     55                 mInfo = new DisplayDeviceInfo();
     56                 mInfo.name = getContext().getResources().getString(
     57                         com.android.internal.R.string.display_manager_built_in_display_name);
     58                 mInfo.width = 640;
     59                 mInfo.height = 480;
     60                 mInfo.refreshRate = 60;
     61                 mInfo.densityDpi = DisplayMetrics.DENSITY_DEFAULT;
     62                 mInfo.xDpi = 160;
     63                 mInfo.yDpi = 160;
     64                 mInfo.flags = DisplayDeviceInfo.FLAG_DEFAULT_DISPLAY
     65                         | DisplayDeviceInfo.FLAG_SECURE
     66                         | DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS;
     67                 mInfo.type = Display.TYPE_BUILT_IN;
     68                 mInfo.touch = DisplayDeviceInfo.TOUCH_NONE;
     69             }
     70             return mInfo;
     71         }
     72     }
     73 }
     74