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.graphics.Rect; 20 import android.hardware.display.DisplayViewport; 21 import android.os.IBinder; 22 import android.view.Surface; 23 import android.view.SurfaceControl; 24 25 import 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 */ 34 abstract 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 * @return A runnable containing work to be deferred until after we have 113 * exited the critical section, or null if none. 114 */ 115 public Runnable requestDisplayStateLocked(int state) { 116 return null; 117 } 118 119 /** 120 * Sets the refresh rate, if supported. 121 */ 122 public void requestRefreshRateLocked(float refreshRate) { 123 } 124 125 /** 126 * Sets the display layer stack while in a transaction. 127 */ 128 public final void setLayerStackInTransactionLocked(int layerStack) { 129 if (mCurrentLayerStack != layerStack) { 130 mCurrentLayerStack = layerStack; 131 SurfaceControl.setDisplayLayerStack(mDisplayToken, layerStack); 132 } 133 } 134 135 /** 136 * Sets the display projection while in a transaction. 137 * 138 * @param orientation defines the display's orientation 139 * @param layerStackRect defines which area of the window manager coordinate 140 * space will be used 141 * @param displayRect defines where on the display will layerStackRect be 142 * mapped to. displayRect is specified post-orientation, that is 143 * it uses the orientation seen by the end-user 144 */ 145 public final void setProjectionInTransactionLocked(int orientation, 146 Rect layerStackRect, Rect displayRect) { 147 if (mCurrentOrientation != orientation 148 || mCurrentLayerStackRect == null 149 || !mCurrentLayerStackRect.equals(layerStackRect) 150 || mCurrentDisplayRect == null 151 || !mCurrentDisplayRect.equals(displayRect)) { 152 mCurrentOrientation = orientation; 153 154 if (mCurrentLayerStackRect == null) { 155 mCurrentLayerStackRect = new Rect(); 156 } 157 mCurrentLayerStackRect.set(layerStackRect); 158 159 if (mCurrentDisplayRect == null) { 160 mCurrentDisplayRect = new Rect(); 161 } 162 mCurrentDisplayRect.set(displayRect); 163 164 SurfaceControl.setDisplayProjection(mDisplayToken, 165 orientation, layerStackRect, displayRect); 166 } 167 } 168 169 /** 170 * Sets the display surface while in a transaction. 171 */ 172 public final void setSurfaceInTransactionLocked(Surface surface) { 173 if (mCurrentSurface != surface) { 174 mCurrentSurface = surface; 175 SurfaceControl.setDisplaySurface(mDisplayToken, surface); 176 } 177 } 178 179 /** 180 * Populates the specified viewport object with orientation, 181 * physical and logical rects based on the display's current projection. 182 */ 183 public final void populateViewportLocked(DisplayViewport viewport) { 184 viewport.orientation = mCurrentOrientation; 185 186 if (mCurrentLayerStackRect != null) { 187 viewport.logicalFrame.set(mCurrentLayerStackRect); 188 } else { 189 viewport.logicalFrame.setEmpty(); 190 } 191 192 if (mCurrentDisplayRect != null) { 193 viewport.physicalFrame.set(mCurrentDisplayRect); 194 } else { 195 viewport.physicalFrame.setEmpty(); 196 } 197 198 boolean isRotated = (mCurrentOrientation == Surface.ROTATION_90 199 || mCurrentOrientation == Surface.ROTATION_270); 200 DisplayDeviceInfo info = getDisplayDeviceInfoLocked(); 201 viewport.deviceWidth = isRotated ? info.height : info.width; 202 viewport.deviceHeight = isRotated ? info.width : info.height; 203 } 204 205 /** 206 * Dumps the local state of the display device. 207 * Does not need to dump the display device info because that is already dumped elsewhere. 208 */ 209 public void dumpLocked(PrintWriter pw) { 210 pw.println("mAdapter=" + mDisplayAdapter.getName()); 211 pw.println("mDisplayToken=" + mDisplayToken); 212 pw.println("mCurrentLayerStack=" + mCurrentLayerStack); 213 pw.println("mCurrentOrientation=" + mCurrentOrientation); 214 pw.println("mCurrentLayerStackRect=" + mCurrentLayerStackRect); 215 pw.println("mCurrentDisplayRect=" + mCurrentDisplayRect); 216 pw.println("mCurrentSurface=" + mCurrentSurface); 217 } 218 } 219