DisplayDevice.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.graphics.Rect; 20import android.hardware.display.DisplayViewport; 21import android.os.IBinder; 22import android.view.Surface; 23import android.view.SurfaceControl; 24 25import java.io.PrintWriter; 26 27/** 28 * Represents a physical display device such as the built-in display 29 * an external monitor, or a WiFi display. 30 * <p> 31 * Display devices are guarded by the {@link DisplayManagerService.SyncRoot} lock. 32 * </p> 33 */ 34abstract class DisplayDevice { 35 private final DisplayAdapter mDisplayAdapter; 36 private final IBinder mDisplayToken; 37 38 // The display device does not manage these properties itself, they are set by 39 // the display manager service. The display device shouldn't really be looking at these. 40 private int mCurrentLayerStack = -1; 41 private int mCurrentOrientation = -1; 42 private Rect mCurrentLayerStackRect; 43 private Rect mCurrentDisplayRect; 44 45 // The display device owns its surface, but it should only set it 46 // within a transaction from performTraversalInTransactionLocked. 47 private Surface mCurrentSurface; 48 49 public DisplayDevice(DisplayAdapter displayAdapter, IBinder displayToken) { 50 mDisplayAdapter = displayAdapter; 51 mDisplayToken = displayToken; 52 } 53 54 /** 55 * Gets the display adapter that owns the display device. 56 * 57 * @return The display adapter. 58 */ 59 public final DisplayAdapter getAdapterLocked() { 60 return mDisplayAdapter; 61 } 62 63 /** 64 * Gets the Surface Flinger display token for this display. 65 * 66 * @return The display token, or null if the display is not being managed 67 * by Surface Flinger. 68 */ 69 public final IBinder getDisplayTokenLocked() { 70 return mDisplayToken; 71 } 72 73 /** 74 * Gets the name of the display device. 75 * 76 * @return The display device name. 77 */ 78 public final String getNameLocked() { 79 return getDisplayDeviceInfoLocked().name; 80 } 81 82 /** 83 * Gets information about the display device. 84 * 85 * The information returned should not change between calls unless the display 86 * adapter sent a {@link DisplayAdapter#DISPLAY_DEVICE_EVENT_CHANGED} event and 87 * {@link #applyPendingDisplayDeviceInfoChangesLocked()} has been called to apply 88 * the pending changes. 89 * 90 * @return The display device info, which should be treated as immutable by the caller. 91 * The display device should allocate a new display device info object whenever 92 * the data changes. 93 */ 94 public abstract DisplayDeviceInfo getDisplayDeviceInfoLocked(); 95 96 /** 97 * Applies any pending changes to the observable state of the display device 98 * if the display adapter sent a {@link DisplayAdapter#DISPLAY_DEVICE_EVENT_CHANGED} event. 99 */ 100 public void applyPendingDisplayDeviceInfoChangesLocked() { 101 } 102 103 /** 104 * Gives the display device a chance to update its properties while in a transaction. 105 */ 106 public void performTraversalInTransactionLocked() { 107 } 108 109 /** 110 * Sets the display state, if supported. 111 */ 112 public void requestDisplayStateLocked(int state) { 113 } 114 115 /** 116 * Sets the display layer stack while in a transaction. 117 */ 118 public final void setLayerStackInTransactionLocked(int layerStack) { 119 if (mCurrentLayerStack != layerStack) { 120 mCurrentLayerStack = layerStack; 121 SurfaceControl.setDisplayLayerStack(mDisplayToken, layerStack); 122 } 123 } 124 125 /** 126 * Sets the display projection while in a transaction. 127 * 128 * @param orientation defines the display's orientation 129 * @param layerStackRect defines which area of the window manager coordinate 130 * space will be used 131 * @param displayRect defines where on the display will layerStackRect be 132 * mapped to. displayRect is specified post-orientation, that is 133 * it uses the orientation seen by the end-user 134 */ 135 public final void setProjectionInTransactionLocked(int orientation, 136 Rect layerStackRect, Rect displayRect) { 137 if (mCurrentOrientation != orientation 138 || mCurrentLayerStackRect == null 139 || !mCurrentLayerStackRect.equals(layerStackRect) 140 || mCurrentDisplayRect == null 141 || !mCurrentDisplayRect.equals(displayRect)) { 142 mCurrentOrientation = orientation; 143 144 if (mCurrentLayerStackRect == null) { 145 mCurrentLayerStackRect = new Rect(); 146 } 147 mCurrentLayerStackRect.set(layerStackRect); 148 149 if (mCurrentDisplayRect == null) { 150 mCurrentDisplayRect = new Rect(); 151 } 152 mCurrentDisplayRect.set(displayRect); 153 154 SurfaceControl.setDisplayProjection(mDisplayToken, 155 orientation, layerStackRect, displayRect); 156 } 157 } 158 159 /** 160 * Sets the display surface while in a transaction. 161 */ 162 public final void setSurfaceInTransactionLocked(Surface surface) { 163 if (mCurrentSurface != surface) { 164 mCurrentSurface = surface; 165 SurfaceControl.setDisplaySurface(mDisplayToken, surface); 166 } 167 } 168 169 /** 170 * Populates the specified viewport object with orientation, 171 * physical and logical rects based on the display's current projection. 172 */ 173 public final void populateViewportLocked(DisplayViewport viewport) { 174 viewport.orientation = mCurrentOrientation; 175 176 if (mCurrentLayerStackRect != null) { 177 viewport.logicalFrame.set(mCurrentLayerStackRect); 178 } else { 179 viewport.logicalFrame.setEmpty(); 180 } 181 182 if (mCurrentDisplayRect != null) { 183 viewport.physicalFrame.set(mCurrentDisplayRect); 184 } else { 185 viewport.physicalFrame.setEmpty(); 186 } 187 188 boolean isRotated = (mCurrentOrientation == Surface.ROTATION_90 189 || mCurrentOrientation == Surface.ROTATION_270); 190 DisplayDeviceInfo info = getDisplayDeviceInfoLocked(); 191 viewport.deviceWidth = isRotated ? info.height : info.width; 192 viewport.deviceHeight = isRotated ? info.width : info.height; 193 } 194 195 /** 196 * Dumps the local state of the display device. 197 * Does not need to dump the display device info because that is already dumped elsewhere. 198 */ 199 public void dumpLocked(PrintWriter pw) { 200 pw.println("mAdapter=" + mDisplayAdapter.getName()); 201 pw.println("mDisplayToken=" + mDisplayToken); 202 pw.println("mCurrentLayerStack=" + mCurrentLayerStack); 203 pw.println("mCurrentOrientation=" + mCurrentOrientation); 204 pw.println("mCurrentLayerStackRect=" + mCurrentLayerStackRect); 205 pw.println("mCurrentDisplayRect=" + mCurrentDisplayRect); 206 pw.println("mCurrentSurface=" + mCurrentSurface); 207 } 208} 209