Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 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.view.DisplayInfo; |
| 21 | import android.view.Surface; |
| 22 | |
| 23 | import java.io.PrintWriter; |
| 24 | import java.util.List; |
| 25 | |
| 26 | import 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 | */ |
| 54 | final 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 | |
Craig Mautner | 722285e | 2012-09-07 13:55:58 -0700 | [diff] [blame^] | 66 | // True if the logical display has unique content. |
| 67 | private boolean mHasContent; |
| 68 | |
Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 69 | // Temporary rectangle used when needed. |
Mathias Agopian | 63f1c43 | 2012-09-04 19:29:13 -0700 | [diff] [blame] | 70 | private final Rect mTempLayerStackRect = new Rect(); |
| 71 | private final Rect mTempDisplayRect = new Rect(); |
Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 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. |
Craig Mautner | 722285e | 2012-09-07 13:55:58 -0700 | [diff] [blame^] | 132 | * This method should be checked after calling {@link #updateLocked} to handle the |
Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 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. |
Mathias Agopian | 63f1c43 | 2012-09-04 19:29:13 -0700 | [diff] [blame] | 215 | mTempLayerStackRect.set(0, 0, displayInfo.logicalWidth, displayInfo.logicalHeight); |
Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 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 | } |
Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 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. |
Mathias Agopian | 63f1c43 | 2012-09-04 19:29:13 -0700 | [diff] [blame] | 243 | int displayRectWidth, displayRectHeight; |
Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 244 | if (physWidth * displayInfo.logicalHeight |
| 245 | < physHeight * displayInfo.logicalWidth) { |
| 246 | // Letter box. |
Mathias Agopian | 63f1c43 | 2012-09-04 19:29:13 -0700 | [diff] [blame] | 247 | displayRectWidth = physWidth; |
| 248 | displayRectHeight = displayInfo.logicalHeight * physWidth / displayInfo.logicalWidth; |
Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 249 | } else { |
| 250 | // Pillar box. |
Mathias Agopian | 63f1c43 | 2012-09-04 19:29:13 -0700 | [diff] [blame] | 251 | displayRectWidth = displayInfo.logicalWidth * physHeight / displayInfo.logicalHeight; |
| 252 | displayRectHeight = physHeight; |
Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 253 | } |
Mathias Agopian | 63f1c43 | 2012-09-04 19:29:13 -0700 | [diff] [blame] | 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); |
Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 260 | } |
| 261 | |
Craig Mautner | 722285e | 2012-09-07 13:55:58 -0700 | [diff] [blame^] | 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 | |
Jeff Brown | 4ed8fe7 | 2012-08-30 18:18:29 -0700 | [diff] [blame] | 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 | } |