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.Display; 21 import android.view.DisplayInfo; 22 import android.view.Surface; 23 24 import java.io.PrintWriter; 25 import java.util.Arrays; 26 import java.util.List; 27 28 import libcore.util.Objects; 29 30 /** 31 * Describes how a logical display is configured. 32 * <p> 33 * At this time, we only support logical displays that are coupled to a particular 34 * primary display device from which the logical display derives its basic properties 35 * such as its size, density and refresh rate. 36 * </p><p> 37 * A logical display may be mirrored onto multiple display devices in addition to its 38 * primary display device. Note that the contents of a logical display may not 39 * always be visible, even on its primary display device, such as in the case where 40 * the primary display device is currently mirroring content from a different 41 * logical display. 42 * </p><p> 43 * This object is designed to encapsulate as much of the policy of logical 44 * displays as possible. The idea is to make it easy to implement new kinds of 45 * logical displays mostly by making local changes to this class. 46 * </p><p> 47 * Note: The display manager architecture does not actually require logical displays 48 * to be associated with any individual display device. Logical displays and 49 * display devices are orthogonal concepts. Some mapping will exist between 50 * logical displays and display devices but it can be many-to-many and 51 * and some might have no relation at all. 52 * </p><p> 53 * Logical displays are guarded by the {@link DisplayManagerService.SyncRoot} lock. 54 * </p> 55 */ 56 final class LogicalDisplay { 57 private final DisplayInfo mBaseDisplayInfo = new DisplayInfo(); 58 59 // The layer stack we use when the display has been blanked to prevent any 60 // of its content from appearing. 61 private static final int BLANK_LAYER_STACK = -1; 62 63 private final int mDisplayId; 64 private final int mLayerStack; 65 private DisplayInfo mOverrideDisplayInfo; // set by the window manager 66 private DisplayInfo mInfo; 67 68 // The display device that this logical display is based on and which 69 // determines the base metrics that it uses. 70 private DisplayDevice mPrimaryDisplayDevice; 71 private DisplayDeviceInfo mPrimaryDisplayDeviceInfo; 72 73 // True if the logical display has unique content. 74 private boolean mHasContent; 75 76 private int mRequestedModeId; 77 78 // The display offsets to apply to the display projection. 79 private int mDisplayOffsetX; 80 private int mDisplayOffsetY; 81 82 // Temporary rectangle used when needed. 83 private final Rect mTempLayerStackRect = new Rect(); 84 private final Rect mTempDisplayRect = new Rect(); 85 86 public LogicalDisplay(int displayId, int layerStack, DisplayDevice primaryDisplayDevice) { 87 mDisplayId = displayId; 88 mLayerStack = layerStack; 89 mPrimaryDisplayDevice = primaryDisplayDevice; 90 } 91 92 /** 93 * Gets the logical display id of this logical display. 94 * 95 * @return The logical display id. 96 */ 97 public int getDisplayIdLocked() { 98 return mDisplayId; 99 } 100 101 /** 102 * Gets the primary display device associated with this logical display. 103 * 104 * @return The primary display device. 105 */ 106 public DisplayDevice getPrimaryDisplayDeviceLocked() { 107 return mPrimaryDisplayDevice; 108 } 109 110 /** 111 * Gets information about the logical display. 112 * 113 * @return The device info, which should be treated as immutable by the caller. 114 * The logical display should allocate a new display info object whenever 115 * the data changes. 116 */ 117 public DisplayInfo getDisplayInfoLocked() { 118 if (mInfo == null) { 119 mInfo = new DisplayInfo(); 120 mInfo.copyFrom(mBaseDisplayInfo); 121 if (mOverrideDisplayInfo != null) { 122 mInfo.appWidth = mOverrideDisplayInfo.appWidth; 123 mInfo.appHeight = mOverrideDisplayInfo.appHeight; 124 mInfo.smallestNominalAppWidth = mOverrideDisplayInfo.smallestNominalAppWidth; 125 mInfo.smallestNominalAppHeight = mOverrideDisplayInfo.smallestNominalAppHeight; 126 mInfo.largestNominalAppWidth = mOverrideDisplayInfo.largestNominalAppWidth; 127 mInfo.largestNominalAppHeight = mOverrideDisplayInfo.largestNominalAppHeight; 128 mInfo.logicalWidth = mOverrideDisplayInfo.logicalWidth; 129 mInfo.logicalHeight = mOverrideDisplayInfo.logicalHeight; 130 mInfo.overscanLeft = mOverrideDisplayInfo.overscanLeft; 131 mInfo.overscanTop = mOverrideDisplayInfo.overscanTop; 132 mInfo.overscanRight = mOverrideDisplayInfo.overscanRight; 133 mInfo.overscanBottom = mOverrideDisplayInfo.overscanBottom; 134 mInfo.rotation = mOverrideDisplayInfo.rotation; 135 mInfo.logicalDensityDpi = mOverrideDisplayInfo.logicalDensityDpi; 136 mInfo.physicalXDpi = mOverrideDisplayInfo.physicalXDpi; 137 mInfo.physicalYDpi = mOverrideDisplayInfo.physicalYDpi; 138 } 139 } 140 return mInfo; 141 } 142 143 /** 144 * Sets overridden logical display information from the window manager. 145 * This method can be used to adjust application insets, rotation, and other 146 * properties that the window manager takes care of. 147 * 148 * @param info The logical display information, may be null. 149 */ 150 public boolean setDisplayInfoOverrideFromWindowManagerLocked(DisplayInfo info) { 151 if (info != null) { 152 if (mOverrideDisplayInfo == null) { 153 mOverrideDisplayInfo = new DisplayInfo(info); 154 mInfo = null; 155 return true; 156 } 157 if (!mOverrideDisplayInfo.equals(info)) { 158 mOverrideDisplayInfo.copyFrom(info); 159 mInfo = null; 160 return true; 161 } 162 } else if (mOverrideDisplayInfo != null) { 163 mOverrideDisplayInfo = null; 164 mInfo = null; 165 return true; 166 } 167 return false; 168 } 169 170 /** 171 * Returns true if the logical display is in a valid state. 172 * This method should be checked after calling {@link #updateLocked} to handle the 173 * case where a logical display should be removed because all of its associated 174 * display devices are gone or if it is otherwise no longer needed. 175 * 176 * @return True if the logical display is still valid. 177 */ 178 public boolean isValidLocked() { 179 return mPrimaryDisplayDevice != null; 180 } 181 182 /** 183 * Updates the state of the logical display based on the available display devices. 184 * The logical display might become invalid if it is attached to a display device 185 * that no longer exists. 186 * 187 * @param devices The list of all connected display devices. 188 */ 189 public void updateLocked(List<DisplayDevice> devices) { 190 // Nothing to update if already invalid. 191 if (mPrimaryDisplayDevice == null) { 192 return; 193 } 194 195 // Check whether logical display has become invalid. 196 if (!devices.contains(mPrimaryDisplayDevice)) { 197 mPrimaryDisplayDevice = null; 198 return; 199 } 200 201 // Bootstrap the logical display using its associated primary physical display. 202 // We might use more elaborate configurations later. It's possible that the 203 // configuration of several physical displays might be used to determine the 204 // logical display that they are sharing. (eg. Adjust size for pixel-perfect 205 // mirroring over HDMI.) 206 DisplayDeviceInfo deviceInfo = mPrimaryDisplayDevice.getDisplayDeviceInfoLocked(); 207 if (!Objects.equal(mPrimaryDisplayDeviceInfo, deviceInfo)) { 208 mBaseDisplayInfo.layerStack = mLayerStack; 209 mBaseDisplayInfo.flags = 0; 210 if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS) != 0) { 211 mBaseDisplayInfo.flags |= Display.FLAG_SUPPORTS_PROTECTED_BUFFERS; 212 } 213 if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_SECURE) != 0) { 214 mBaseDisplayInfo.flags |= Display.FLAG_SECURE; 215 } 216 if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_PRIVATE) != 0) { 217 mBaseDisplayInfo.flags |= Display.FLAG_PRIVATE; 218 } 219 if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_PRESENTATION) != 0) { 220 mBaseDisplayInfo.flags |= Display.FLAG_PRESENTATION; 221 } 222 if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_ROUND) != 0) { 223 mBaseDisplayInfo.flags |= Display.FLAG_ROUND; 224 } 225 mBaseDisplayInfo.type = deviceInfo.type; 226 mBaseDisplayInfo.address = deviceInfo.address; 227 mBaseDisplayInfo.name = deviceInfo.name; 228 mBaseDisplayInfo.uniqueId = deviceInfo.uniqueId; 229 mBaseDisplayInfo.appWidth = deviceInfo.width; 230 mBaseDisplayInfo.appHeight = deviceInfo.height; 231 mBaseDisplayInfo.logicalWidth = deviceInfo.width; 232 mBaseDisplayInfo.logicalHeight = deviceInfo.height; 233 mBaseDisplayInfo.rotation = Surface.ROTATION_0; 234 mBaseDisplayInfo.modeId = deviceInfo.modeId; 235 mBaseDisplayInfo.defaultModeId = deviceInfo.defaultModeId; 236 mBaseDisplayInfo.supportedModes = Arrays.copyOf( 237 deviceInfo.supportedModes, deviceInfo.supportedModes.length); 238 mBaseDisplayInfo.logicalDensityDpi = deviceInfo.densityDpi; 239 mBaseDisplayInfo.physicalXDpi = deviceInfo.xDpi; 240 mBaseDisplayInfo.physicalYDpi = deviceInfo.yDpi; 241 mBaseDisplayInfo.appVsyncOffsetNanos = deviceInfo.appVsyncOffsetNanos; 242 mBaseDisplayInfo.presentationDeadlineNanos = deviceInfo.presentationDeadlineNanos; 243 mBaseDisplayInfo.state = deviceInfo.state; 244 mBaseDisplayInfo.smallestNominalAppWidth = deviceInfo.width; 245 mBaseDisplayInfo.smallestNominalAppHeight = deviceInfo.height; 246 mBaseDisplayInfo.largestNominalAppWidth = deviceInfo.width; 247 mBaseDisplayInfo.largestNominalAppHeight = deviceInfo.height; 248 mBaseDisplayInfo.ownerUid = deviceInfo.ownerUid; 249 mBaseDisplayInfo.ownerPackageName = deviceInfo.ownerPackageName; 250 251 mPrimaryDisplayDeviceInfo = deviceInfo; 252 mInfo = null; 253 } 254 } 255 256 /** 257 * Applies the layer stack and transformation to the given display device 258 * so that it shows the contents of this logical display. 259 * 260 * We know that the given display device is only ever showing the contents of 261 * a single logical display, so this method is expected to blow away all of its 262 * transformation properties to make it happen regardless of what the 263 * display device was previously showing. 264 * 265 * The caller must have an open Surface transaction. 266 * 267 * The display device may not be the primary display device, in the case 268 * where the display is being mirrored. 269 * 270 * @param device The display device to modify. 271 * @param isBlanked True if the device is being blanked. 272 */ 273 public void configureDisplayInTransactionLocked(DisplayDevice device, 274 boolean isBlanked) { 275 // Set the layer stack. 276 device.setLayerStackInTransactionLocked(isBlanked ? BLANK_LAYER_STACK : mLayerStack); 277 278 // Set the mode. 279 if (device == mPrimaryDisplayDevice) { 280 device.requestModeInTransactionLocked(mRequestedModeId); 281 } else { 282 device.requestModeInTransactionLocked(0); // Revert to default. 283 } 284 285 // Only grab the display info now as it may have been changed based on the requests above. 286 final DisplayInfo displayInfo = getDisplayInfoLocked(); 287 final DisplayDeviceInfo displayDeviceInfo = device.getDisplayDeviceInfoLocked(); 288 289 // Set the viewport. 290 // This is the area of the logical display that we intend to show on the 291 // display device. For now, it is always the full size of the logical display. 292 mTempLayerStackRect.set(0, 0, displayInfo.logicalWidth, displayInfo.logicalHeight); 293 294 // Set the orientation. 295 // The orientation specifies how the physical coordinate system of the display 296 // is rotated when the contents of the logical display are rendered. 297 int orientation = Surface.ROTATION_0; 298 if ((displayDeviceInfo.flags & DisplayDeviceInfo.FLAG_ROTATES_WITH_CONTENT) != 0) { 299 orientation = displayInfo.rotation; 300 } 301 302 // Apply the physical rotation of the display device itself. 303 orientation = (orientation + displayDeviceInfo.rotation) % 4; 304 305 // Set the frame. 306 // The frame specifies the rotated physical coordinates into which the viewport 307 // is mapped. We need to take care to preserve the aspect ratio of the viewport. 308 // Currently we maximize the area to fill the display, but we could try to be 309 // more clever and match resolutions. 310 boolean rotated = (orientation == Surface.ROTATION_90 311 || orientation == Surface.ROTATION_270); 312 int physWidth = rotated ? displayDeviceInfo.height : displayDeviceInfo.width; 313 int physHeight = rotated ? displayDeviceInfo.width : displayDeviceInfo.height; 314 315 // Determine whether the width or height is more constrained to be scaled. 316 // physWidth / displayInfo.logicalWidth => letter box 317 // or physHeight / displayInfo.logicalHeight => pillar box 318 // 319 // We avoid a division (and possible floating point imprecision) here by 320 // multiplying the fractions by the product of their denominators before 321 // comparing them. 322 int displayRectWidth, displayRectHeight; 323 if ((displayInfo.flags & Display.FLAG_SCALING_DISABLED) != 0) { 324 displayRectWidth = displayInfo.logicalWidth; 325 displayRectHeight = displayInfo.logicalHeight; 326 } else if (physWidth * displayInfo.logicalHeight 327 < physHeight * displayInfo.logicalWidth) { 328 // Letter box. 329 displayRectWidth = physWidth; 330 displayRectHeight = displayInfo.logicalHeight * physWidth / displayInfo.logicalWidth; 331 } else { 332 // Pillar box. 333 displayRectWidth = displayInfo.logicalWidth * physHeight / displayInfo.logicalHeight; 334 displayRectHeight = physHeight; 335 } 336 int displayRectTop = (physHeight - displayRectHeight) / 2; 337 int displayRectLeft = (physWidth - displayRectWidth) / 2; 338 mTempDisplayRect.set(displayRectLeft, displayRectTop, 339 displayRectLeft + displayRectWidth, displayRectTop + displayRectHeight); 340 341 mTempDisplayRect.left += mDisplayOffsetX; 342 mTempDisplayRect.right += mDisplayOffsetX; 343 mTempDisplayRect.top += mDisplayOffsetY; 344 mTempDisplayRect.bottom += mDisplayOffsetY; 345 device.setProjectionInTransactionLocked(orientation, mTempLayerStackRect, mTempDisplayRect); 346 } 347 348 /** 349 * Returns true if the logical display has unique content. 350 * <p> 351 * If the display has unique content then we will try to ensure that it is 352 * visible on at least its primary display device. Otherwise we will ignore the 353 * logical display and perhaps show mirrored content on the primary display device. 354 * </p> 355 * 356 * @return True if the display has unique content. 357 */ 358 public boolean hasContentLocked() { 359 return mHasContent; 360 } 361 362 /** 363 * Sets whether the logical display has unique content. 364 * 365 * @param hasContent True if the display has unique content. 366 */ 367 public void setHasContentLocked(boolean hasContent) { 368 mHasContent = hasContent; 369 } 370 371 /** 372 * Requests the given mode. 373 */ 374 public void setRequestedModeIdLocked(int modeId) { 375 mRequestedModeId = modeId; 376 } 377 378 /** 379 * Returns the pending requested mode. 380 */ 381 public int getRequestedModeIdLocked() { 382 return mRequestedModeId; 383 } 384 385 /** 386 * Gets the burn-in offset in X. 387 */ 388 public int getDisplayOffsetXLocked() { 389 return mDisplayOffsetX; 390 } 391 392 /** 393 * Gets the burn-in offset in Y. 394 */ 395 public int getDisplayOffsetYLocked() { 396 return mDisplayOffsetY; 397 } 398 399 /** 400 * Sets the burn-in offsets. 401 */ 402 public void setDisplayOffsetsLocked(int x, int y) { 403 mDisplayOffsetX = x; 404 mDisplayOffsetY = y; 405 } 406 407 public void dumpLocked(PrintWriter pw) { 408 pw.println("mDisplayId=" + mDisplayId); 409 pw.println("mLayerStack=" + mLayerStack); 410 pw.println("mHasContent=" + mHasContent); 411 pw.println("mRequestedMode=" + mRequestedModeId); 412 pw.println("mDisplayOffset=(" + mDisplayOffsetX + ", " + mDisplayOffsetY + ")"); 413 pw.println("mPrimaryDisplayDevice=" + (mPrimaryDisplayDevice != null ? 414 mPrimaryDisplayDevice.getNameLocked() : "null")); 415 pw.println("mBaseDisplayInfo=" + mBaseDisplayInfo); 416 pw.println("mOverrideDisplayInfo=" + mOverrideDisplayInfo); 417 } 418 } 419
