LogicalDisplay.java revision 722285e199a9fc74b9b3343b7505c00666848c88
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.view.DisplayInfo; 21import android.view.Surface; 22 23import java.io.PrintWriter; 24import java.util.List; 25 26import libcore.util.Objects; 27 28/** 29 * Describes how a logical display is configured. 30 * <p> 31 * At this time, we only support logical displays that are coupled to a particular 32 * primary display device from which the logical display derives its basic properties 33 * such as its size, density and refresh rate. 34 * </p><p> 35 * A logical display may be mirrored onto multiple display devices in addition to its 36 * primary display device. Note that the contents of a logical display may not 37 * always be visible, even on its primary display device, such as in the case where 38 * the primary display device is currently mirroring content from a different 39 * logical display. 40 * </p><p> 41 * This object is designed to encapsulate as much of the policy of logical 42 * displays as possible. The idea is to make it easy to implement new kinds of 43 * logical displays mostly by making local changes to this class. 44 * </p><p> 45 * Note: The display manager architecture does not actually require logical displays 46 * to be associated with any individual display device. Logical displays and 47 * display devices are orthogonal concepts. Some mapping will exist between 48 * logical displays and display devices but it can be many-to-many and 49 * and some might have no relation at all. 50 * </p><p> 51 * Logical displays are guarded by the {@link DisplayManagerService.SyncRoot} lock. 52 * </p> 53 */ 54final class LogicalDisplay { 55 private final DisplayInfo mBaseDisplayInfo = new DisplayInfo(); 56 57 private final int mLayerStack; 58 private DisplayInfo mOverrideDisplayInfo; // set by the window manager 59 private DisplayInfo mInfo; 60 61 // The display device that this logical display is based on and which 62 // determines the base metrics that it uses. 63 private DisplayDevice mPrimaryDisplayDevice; 64 private DisplayDeviceInfo mPrimaryDisplayDeviceInfo; 65 66 // True if the logical display has unique content. 67 private boolean mHasContent; 68 69 // Temporary rectangle used when needed. 70 private final Rect mTempLayerStackRect = new Rect(); 71 private final Rect mTempDisplayRect = new Rect(); 72 73 public LogicalDisplay(int layerStack, DisplayDevice primaryDisplayDevice) { 74 mLayerStack = layerStack; 75 mPrimaryDisplayDevice = primaryDisplayDevice; 76 } 77 78 /** 79 * Gets the primary display device associated with this logical display. 80 * 81 * @return The primary display device. 82 */ 83 public DisplayDevice getPrimaryDisplayDeviceLocked() { 84 return mPrimaryDisplayDevice; 85 } 86 87 /** 88 * Gets information about the logical display. 89 * 90 * @return The device info, which should be treated as immutable by the caller. 91 * The logical display should allocate a new display info object whenever 92 * the data changes. 93 */ 94 public DisplayInfo getDisplayInfoLocked() { 95 if (mInfo == null) { 96 mInfo = new DisplayInfo(); 97 if (mOverrideDisplayInfo != null) { 98 mInfo.copyFrom(mOverrideDisplayInfo); 99 mInfo.layerStack = mBaseDisplayInfo.layerStack; 100 mInfo.name = mBaseDisplayInfo.name; 101 } else { 102 mInfo.copyFrom(mBaseDisplayInfo); 103 } 104 } 105 return mInfo; 106 } 107 108 /** 109 * Sets overridden logical display information from the window manager. 110 * This method can be used to adjust application insets, rotation, and other 111 * properties that the window manager takes care of. 112 * 113 * @param info The logical display information, may be null. 114 */ 115 public void setDisplayInfoOverrideFromWindowManagerLocked(DisplayInfo info) { 116 if (info != null) { 117 if (mOverrideDisplayInfo == null) { 118 mOverrideDisplayInfo = new DisplayInfo(info); 119 mInfo = null; 120 } else if (!mOverrideDisplayInfo.equals(info)) { 121 mOverrideDisplayInfo.copyFrom(info); 122 mInfo = null; 123 } 124 } else if (mOverrideDisplayInfo != null) { 125 mOverrideDisplayInfo = null; 126 mInfo = null; 127 } 128 } 129 130 /** 131 * Returns true if the logical display is in a valid state. 132 * This method should be checked after calling {@link #updateLocked} to handle the 133 * case where a logical display should be removed because all of its associated 134 * display devices are gone or if it is otherwise no longer needed. 135 * 136 * @return True if the logical display is still valid. 137 */ 138 public boolean isValidLocked() { 139 return mPrimaryDisplayDevice != null; 140 } 141 142 /** 143 * Updates the state of the logical display based on the available display devices. 144 * The logical display might become invalid if it is attached to a display device 145 * that no longer exists. 146 * 147 * @param devices The list of all connected display devices. 148 */ 149 public void updateLocked(List<DisplayDevice> devices) { 150 // Nothing to update if already invalid. 151 if (mPrimaryDisplayDevice == null) { 152 return; 153 } 154 155 // Check whether logical display has become invalid. 156 if (!devices.contains(mPrimaryDisplayDevice)) { 157 mPrimaryDisplayDevice = null; 158 return; 159 } 160 161 // Bootstrap the logical display using its associated primary physical display. 162 // We might use more elaborate configurations later. It's possible that the 163 // configuration of several physical displays might be used to determine the 164 // logical display that they are sharing. (eg. Adjust size for pixel-perfect 165 // mirroring over HDMI.) 166 DisplayDeviceInfo deviceInfo = mPrimaryDisplayDevice.getDisplayDeviceInfoLocked(); 167 if (!Objects.equal(mPrimaryDisplayDeviceInfo, deviceInfo)) { 168 mBaseDisplayInfo.layerStack = mLayerStack; 169 mBaseDisplayInfo.name = deviceInfo.name; 170 mBaseDisplayInfo.appWidth = deviceInfo.width; 171 mBaseDisplayInfo.appHeight = deviceInfo.height; 172 mBaseDisplayInfo.logicalWidth = deviceInfo.width; 173 mBaseDisplayInfo.logicalHeight = deviceInfo.height; 174 mBaseDisplayInfo.rotation = Surface.ROTATION_0; 175 mBaseDisplayInfo.refreshRate = deviceInfo.refreshRate; 176 mBaseDisplayInfo.logicalDensityDpi = deviceInfo.densityDpi; 177 mBaseDisplayInfo.physicalXDpi = deviceInfo.xDpi; 178 mBaseDisplayInfo.physicalYDpi = deviceInfo.yDpi; 179 mBaseDisplayInfo.smallestNominalAppWidth = deviceInfo.width; 180 mBaseDisplayInfo.smallestNominalAppHeight = deviceInfo.height; 181 mBaseDisplayInfo.largestNominalAppWidth = deviceInfo.width; 182 mBaseDisplayInfo.largestNominalAppHeight = deviceInfo.height; 183 184 mPrimaryDisplayDeviceInfo = deviceInfo; 185 mInfo = null; 186 } 187 } 188 189 /** 190 * Applies the layer stack and transformation to the given display device 191 * so that it shows the contents of this logical display. 192 * 193 * We know that the given display device is only ever showing the contents of 194 * a single logical display, so this method is expected to blow away all of its 195 * transformation properties to make it happen regardless of what the 196 * display device was previously showing. 197 * 198 * The caller must have an open Surface transaction. 199 * 200 * The display device may not be the primary display device, in the case 201 * where the display is being mirrored. 202 * 203 * @param device The display device to modify. 204 */ 205 public void configureDisplayInTransactionLocked(DisplayDevice device) { 206 final DisplayInfo displayInfo = getDisplayInfoLocked(); 207 final DisplayDeviceInfo displayDeviceInfo = device.getDisplayDeviceInfoLocked(); 208 209 // Set the layer stack. 210 device.setLayerStackInTransactionLocked(mLayerStack); 211 212 // Set the viewport. 213 // This is the area of the logical display that we intend to show on the 214 // display device. For now, it is always the full size of the logical display. 215 mTempLayerStackRect.set(0, 0, displayInfo.logicalWidth, displayInfo.logicalHeight); 216 217 // Set the orientation. 218 // The orientation specifies how the physical coordinate system of the display 219 // is rotated when the contents of the logical display are rendered. 220 int orientation = Surface.ROTATION_0; 221 if (device == mPrimaryDisplayDevice 222 && (displayDeviceInfo.flags & DisplayDeviceInfo.FLAG_SUPPORTS_ROTATION) != 0) { 223 orientation = displayInfo.rotation; 224 } 225 226 // Set the frame. 227 // The frame specifies the rotated physical coordinates into which the viewport 228 // is mapped. We need to take care to preserve the aspect ratio of the viewport. 229 // Currently we maximize the area to fill the display, but we could try to be 230 // more clever and match resolutions. 231 boolean rotated = (orientation == Surface.ROTATION_90 232 || orientation == Surface.ROTATION_270); 233 int physWidth = rotated ? displayDeviceInfo.height : displayDeviceInfo.width; 234 int physHeight = rotated ? displayDeviceInfo.width : displayDeviceInfo.height; 235 236 // Determine whether the width or height is more constrained to be scaled. 237 // physWidth / displayInfo.logicalWidth => letter box 238 // or physHeight / displayInfo.logicalHeight => pillar box 239 // 240 // We avoid a division (and possible floating point imprecision) here by 241 // multiplying the fractions by the product of their denominators before 242 // comparing them. 243 int displayRectWidth, displayRectHeight; 244 if (physWidth * displayInfo.logicalHeight 245 < physHeight * displayInfo.logicalWidth) { 246 // Letter box. 247 displayRectWidth = physWidth; 248 displayRectHeight = displayInfo.logicalHeight * physWidth / displayInfo.logicalWidth; 249 } else { 250 // Pillar box. 251 displayRectWidth = displayInfo.logicalWidth * physHeight / displayInfo.logicalHeight; 252 displayRectHeight = physHeight; 253 } 254 int displayRectTop = (physHeight - displayRectHeight) / 2; 255 int displayRectLeft = (physWidth - displayRectWidth) / 2; 256 mTempDisplayRect.set(displayRectLeft, displayRectTop, 257 displayRectLeft + displayRectWidth, displayRectTop + displayRectHeight); 258 259 device.setProjectionInTransactionLocked(orientation, mTempLayerStackRect, mTempDisplayRect); 260 } 261 262 /** 263 * Returns true if the logical display has unique content. 264 * <p> 265 * If the display has unique content then we will try to ensure that it is 266 * visible on at least its primary display device. Otherwise we will ignore the 267 * logical display and perhaps show mirrored content on the primary display device. 268 * </p> 269 * 270 * @return True if the display has unique content. 271 */ 272 public boolean hasContentLocked() { 273 return mHasContent; 274 } 275 276 /** 277 * Sets whether the logical display has unique content. 278 * 279 * @param hasContent True if the display has unique content. 280 */ 281 public void setHasContentLocked(boolean hasContent) { 282 mHasContent = hasContent; 283 } 284 285 public void dumpLocked(PrintWriter pw) { 286 pw.println("mLayerStack=" + mLayerStack); 287 pw.println("mPrimaryDisplayDevice=" + (mPrimaryDisplayDevice != null ? 288 mPrimaryDisplayDevice.getNameLocked() : "null")); 289 pw.println("mBaseDisplayInfo=" + mBaseDisplayInfo); 290 pw.println("mOverrideDisplayInfo=" + mOverrideDisplayInfo); 291 } 292}