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 private int mRequestedColorMode; 78 79 // The display offsets to apply to the display projection. 80 private int mDisplayOffsetX; 81 private int mDisplayOffsetY; 82 83 // Temporary rectangle used when needed. 84 private final Rect mTempLayerStackRect = new Rect(); 85 private final Rect mTempDisplayRect = new Rect(); 86 87 public LogicalDisplay(int displayId, int layerStack, DisplayDevice primaryDisplayDevice) { 88 mDisplayId = displayId; 89 mLayerStack = layerStack; 90 mPrimaryDisplayDevice = primaryDisplayDevice; 91 } 92 93 /** 94 * Gets the logical display id of this logical display. 95 * 96 * @return The logical display id. 97 */ 98 public int getDisplayIdLocked() { 99 return mDisplayId; 100 } 101 102 /** 103 * Gets the primary display device associated with this logical display. 104 * 105 * @return The primary display device. 106 */ 107 public DisplayDevice getPrimaryDisplayDeviceLocked() { 108 return mPrimaryDisplayDevice; 109 } 110 111 /** 112 * Gets information about the logical display. 113 * 114 * @return The device info, which should be treated as immutable by the caller. 115 * The logical display should allocate a new display info object whenever 116 * the data changes. 117 */ 118 public DisplayInfo getDisplayInfoLocked() { 119 if (mInfo == null) { 120 mInfo = new DisplayInfo(); 121 mInfo.copyFrom(mBaseDisplayInfo); 122 if (mOverrideDisplayInfo != null) { 123 mInfo.appWidth = mOverrideDisplayInfo.appWidth; 124 mInfo.appHeight = mOverrideDisplayInfo.appHeight; 125 mInfo.smallestNominalAppWidth = mOverrideDisplayInfo.smallestNominalAppWidth; 126 mInfo.smallestNominalAppHeight = mOverrideDisplayInfo.smallestNominalAppHeight; 127 mInfo.largestNominalAppWidth = mOverrideDisplayInfo.largestNominalAppWidth; 128 mInfo.largestNominalAppHeight = mOverrideDisplayInfo.largestNominalAppHeight; 129 mInfo.logicalWidth = mOverrideDisplayInfo.logicalWidth; 130 mInfo.logicalHeight = mOverrideDisplayInfo.logicalHeight; 131 mInfo.overscanLeft = mOverrideDisplayInfo.overscanLeft; 132 mInfo.overscanTop = mOverrideDisplayInfo.overscanTop; 133 mInfo.overscanRight = mOverrideDisplayInfo.overscanRight; 134 mInfo.overscanBottom = mOverrideDisplayInfo.overscanBottom; 135 mInfo.rotation = mOverrideDisplayInfo.rotation; 136 mInfo.logicalDensityDpi = mOverrideDisplayInfo.logicalDensityDpi; 137 mInfo.physicalXDpi = mOverrideDisplayInfo.physicalXDpi; 138 mInfo.physicalYDpi = mOverrideDisplayInfo.physicalYDpi; 139 } 140 } 141 return mInfo; 142 } 143 144 /** 145 * Sets overridden logical display information from the window manager. 146 * This method can be used to adjust application insets, rotation, and other 147 * properties that the window manager takes care of. 148 * 149 * @param info The logical display information, may be null. 150 */ 151 public boolean setDisplayInfoOverrideFromWindowManagerLocked(DisplayInfo info) { 152 if (info != null) { 153 if (mOverrideDisplayInfo == null) { 154 mOverrideDisplayInfo = new DisplayInfo(info); 155 mInfo = null; 156 return true; 157 } 158 if (!mOverrideDisplayInfo.equals(info)) { 159 mOverrideDisplayInfo.copyFrom(info); 160 mInfo = null; 161 return true; 162 } 163 } else if (mOverrideDisplayInfo != null) { 164 mOverrideDisplayInfo = null; 165 mInfo = null; 166 return true; 167 } 168 return false; 169 } 170 171 /** 172 * Returns true if the logical display is in a valid state. 173 * This method should be checked after calling {@link #updateLocked} to handle the 174 * case where a logical display should be removed because all of its associated 175 * display devices are gone or if it is otherwise no longer needed. 176 * 177 * @return True if the logical display is still valid. 178 */ 179 public boolean isValidLocked() { 180 return mPrimaryDisplayDevice != null; 181 } 182 183 /** 184 * Updates the state of the logical display based on the available display devices. 185 * The logical display might become invalid if it is attached to a display device 186 * that no longer exists. 187 * 188 * @param devices The list of all connected display devices. 189 */ 190 public void updateLocked(List<DisplayDevice> devices) { 191 // Nothing to update if already invalid. 192 if (mPrimaryDisplayDevice == null) { 193 return; 194 } 195 196 // Check whether logical display has become invalid. 197 if (!devices.contains(mPrimaryDisplayDevice)) { 198 mPrimaryDisplayDevice = null; 199 return; 200 } 201 202 // Bootstrap the logical display using its associated primary physical display. 203 // We might use more elaborate configurations later. It's possible that the 204 // configuration of several physical displays might be used to determine the 205 // logical display that they are sharing. (eg. Adjust size for pixel-perfect 206 // mirroring over HDMI.) 207 DisplayDeviceInfo deviceInfo = mPrimaryDisplayDevice.getDisplayDeviceInfoLocked(); 208 if (!Objects.equal(mPrimaryDisplayDeviceInfo, deviceInfo)) { 209 mBaseDisplayInfo.layerStack = mLayerStack; 210 mBaseDisplayInfo.flags = 0; 211 if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS) != 0) { 212 mBaseDisplayInfo.flags |= Display.FLAG_SUPPORTS_PROTECTED_BUFFERS; 213 } 214 if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_SECURE) != 0) { 215 mBaseDisplayInfo.flags |= Display.FLAG_SECURE; 216 } 217 if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_PRIVATE) != 0) { 218 mBaseDisplayInfo.flags |= Display.FLAG_PRIVATE; 219 } 220 if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_PRESENTATION) != 0) { 221 mBaseDisplayInfo.flags |= Display.FLAG_PRESENTATION; 222 } 223 if ((deviceInfo.flags & DisplayDeviceInfo.FLAG_ROUND) != 0) { 224 mBaseDisplayInfo.flags |= Display.FLAG_ROUND; 225 } 226 mBaseDisplayInfo.type = deviceInfo.type; 227 mBaseDisplayInfo.address = deviceInfo.address; 228 mBaseDisplayInfo.name = deviceInfo.name; 229 mBaseDisplayInfo.uniqueId = deviceInfo.uniqueId; 230 mBaseDisplayInfo.appWidth = deviceInfo.width; 231 mBaseDisplayInfo.appHeight = deviceInfo.height; 232 mBaseDisplayInfo.logicalWidth = deviceInfo.width; 233 mBaseDisplayInfo.logicalHeight = deviceInfo.height; 234 mBaseDisplayInfo.rotation = Surface.ROTATION_0; 235 mBaseDisplayInfo.modeId = deviceInfo.modeId; 236 mBaseDisplayInfo.defaultModeId = deviceInfo.defaultModeId; 237 mBaseDisplayInfo.supportedModes = Arrays.copyOf( 238 deviceInfo.supportedModes, deviceInfo.supportedModes.length); 239 mBaseDisplayInfo.colorMode = deviceInfo.colorMode; 240 mBaseDisplayInfo.supportedColorModes = Arrays.copyOf( 241 deviceInfo.supportedColorModes, 242 deviceInfo.supportedColorModes.length); 243 mBaseDisplayInfo.hdrCapabilities = deviceInfo.hdrCapabilities; 244 mBaseDisplayInfo.logicalDensityDpi = deviceInfo.densityDpi; 245 mBaseDisplayInfo.physicalXDpi = deviceInfo.xDpi; 246 mBaseDisplayInfo.physicalYDpi = deviceInfo.yDpi; 247 mBaseDisplayInfo.appVsyncOffsetNanos = deviceInfo.appVsyncOffsetNanos; 248 mBaseDisplayInfo.presentationDeadlineNanos = deviceInfo.presentationDeadlineNanos; 249 mBaseDisplayInfo.state = deviceInfo.state; 250 mBaseDisplayInfo.smallestNominalAppWidth = deviceInfo.width; 251 mBaseDisplayInfo.smallestNominalAppHeight = deviceInfo.height; 252 mBaseDisplayInfo.largestNominalAppWidth = deviceInfo.width; 253 mBaseDisplayInfo.largestNominalAppHeight = deviceInfo.height; 254 mBaseDisplayInfo.ownerUid = deviceInfo.ownerUid; 255 mBaseDisplayInfo.ownerPackageName = deviceInfo.ownerPackageName; 256 257 mPrimaryDisplayDeviceInfo = deviceInfo; 258 mInfo = null; 259 } 260 } 261 262 /** 263 * Applies the layer stack and transformation to the given display device 264 * so that it shows the contents of this logical display. 265 * 266 * We know that the given display device is only ever showing the contents of 267 * a single logical display, so this method is expected to blow away all of its 268 * transformation properties to make it happen regardless of what the 269 * display device was previously showing. 270 * 271 * The caller must have an open Surface transaction. 272 * 273 * The display device may not be the primary display device, in the case 274 * where the display is being mirrored. 275 * 276 * @param device The display device to modify. 277 * @param isBlanked True if the device is being blanked. 278 */ 279 public void configureDisplayInTransactionLocked(DisplayDevice device, 280 boolean isBlanked) { 281 // Set the layer stack. 282 device.setLayerStackInTransactionLocked(isBlanked ? BLANK_LAYER_STACK : mLayerStack); 283 284 // Set the color mode and mode. 285 if (device == mPrimaryDisplayDevice) { 286 device.requestDisplayModesInTransactionLocked( 287 mRequestedColorMode, mRequestedModeId); 288 } else { 289 device.requestDisplayModesInTransactionLocked(0, 0); // Revert to default. 290 } 291 292 // Only grab the display info now as it may have been changed based on the requests above. 293 final DisplayInfo displayInfo = getDisplayInfoLocked(); 294 final DisplayDeviceInfo displayDeviceInfo = device.getDisplayDeviceInfoLocked(); 295 296 // Set the viewport. 297 // This is the area of the logical display that we intend to show on the 298 // display device. For now, it is always the full size of the logical display. 299 mTempLayerStackRect.set(0, 0, displayInfo.logicalWidth, displayInfo.logicalHeight); 300 301 // Set the orientation. 302 // The orientation specifies how the physical coordinate system of the display 303 // is rotated when the contents of the logical display are rendered. 304 int orientation = Surface.ROTATION_0; 305 if ((displayDeviceInfo.flags & DisplayDeviceInfo.FLAG_ROTATES_WITH_CONTENT) != 0) { 306 orientation = displayInfo.rotation; 307 } 308 309 // Apply the physical rotation of the display device itself. 310 orientation = (orientation + displayDeviceInfo.rotation) % 4; 311 312 // Set the frame. 313 // The frame specifies the rotated physical coordinates into which the viewport 314 // is mapped. We need to take care to preserve the aspect ratio of the viewport. 315 // Currently we maximize the area to fill the display, but we could try to be 316 // more clever and match resolutions. 317 boolean rotated = (orientation == Surface.ROTATION_90 318 || orientation == Surface.ROTATION_270); 319 int physWidth = rotated ? displayDeviceInfo.height : displayDeviceInfo.width; 320 int physHeight = rotated ? displayDeviceInfo.width : displayDeviceInfo.height; 321 322 // Determine whether the width or height is more constrained to be scaled. 323 // physWidth / displayInfo.logicalWidth => letter box 324 // or physHeight / displayInfo.logicalHeight => pillar box 325 // 326 // We avoid a division (and possible floating point imprecision) here by 327 // multiplying the fractions by the product of their denominators before 328 // comparing them. 329 int displayRectWidth, displayRectHeight; 330 if ((displayInfo.flags & Display.FLAG_SCALING_DISABLED) != 0) { 331 displayRectWidth = displayInfo.logicalWidth; 332 displayRectHeight = displayInfo.logicalHeight; 333 } else if (physWidth * displayInfo.logicalHeight 334 < physHeight * displayInfo.logicalWidth) { 335 // Letter box. 336 displayRectWidth = physWidth; 337 displayRectHeight = displayInfo.logicalHeight * physWidth / displayInfo.logicalWidth; 338 } else { 339 // Pillar box. 340 displayRectWidth = displayInfo.logicalWidth * physHeight / displayInfo.logicalHeight; 341 displayRectHeight = physHeight; 342 } 343 int displayRectTop = (physHeight - displayRectHeight) / 2; 344 int displayRectLeft = (physWidth - displayRectWidth) / 2; 345 mTempDisplayRect.set(displayRectLeft, displayRectTop, 346 displayRectLeft + displayRectWidth, displayRectTop + displayRectHeight); 347 348 mTempDisplayRect.left += mDisplayOffsetX; 349 mTempDisplayRect.right += mDisplayOffsetX; 350 mTempDisplayRect.top += mDisplayOffsetY; 351 mTempDisplayRect.bottom += mDisplayOffsetY; 352 device.setProjectionInTransactionLocked(orientation, mTempLayerStackRect, mTempDisplayRect); 353 } 354 355 /** 356 * Returns true if the logical display has unique content. 357 * <p> 358 * If the display has unique content then we will try to ensure that it is 359 * visible on at least its primary display device. Otherwise we will ignore the 360 * logical display and perhaps show mirrored content on the primary display device. 361 * </p> 362 * 363 * @return True if the display has unique content. 364 */ 365 public boolean hasContentLocked() { 366 return mHasContent; 367 } 368 369 /** 370 * Sets whether the logical display has unique content. 371 * 372 * @param hasContent True if the display has unique content. 373 */ 374 public void setHasContentLocked(boolean hasContent) { 375 mHasContent = hasContent; 376 } 377 378 /** 379 * Requests the given mode. 380 */ 381 public void setRequestedModeIdLocked(int modeId) { 382 mRequestedModeId = modeId; 383 } 384 385 /** 386 * Returns the pending requested mode. 387 */ 388 public int getRequestedModeIdLocked() { 389 return mRequestedModeId; 390 } 391 392 /** 393 * Requests the given color mode. 394 */ 395 public void setRequestedColorModeLocked(int colorMode) { 396 mRequestedColorMode = colorMode; 397 } 398 399 /** Returns the pending requested color mode. */ 400 public int getRequestedColorModeLocked() { 401 return mRequestedColorMode; 402 } 403 404 /** 405 * Gets the burn-in offset in X. 406 */ 407 public int getDisplayOffsetXLocked() { 408 return mDisplayOffsetX; 409 } 410 411 /** 412 * Gets the burn-in offset in Y. 413 */ 414 public int getDisplayOffsetYLocked() { 415 return mDisplayOffsetY; 416 } 417 418 /** 419 * Sets the burn-in offsets. 420 */ 421 public void setDisplayOffsetsLocked(int x, int y) { 422 mDisplayOffsetX = x; 423 mDisplayOffsetY = y; 424 } 425 426 public void dumpLocked(PrintWriter pw) { 427 pw.println("mDisplayId=" + mDisplayId); 428 pw.println("mLayerStack=" + mLayerStack); 429 pw.println("mHasContent=" + mHasContent); 430 pw.println("mRequestedMode=" + mRequestedModeId); 431 pw.println("mRequestedColorMode=" + mRequestedColorMode); 432 pw.println("mDisplayOffset=(" + mDisplayOffsetX + ", " + mDisplayOffsetY + ")"); 433 pw.println("mPrimaryDisplayDevice=" + (mPrimaryDisplayDevice != null ? 434 mPrimaryDisplayDevice.getNameLocked() : "null")); 435 pw.println("mBaseDisplayInfo=" + mBaseDisplayInfo); 436 pw.println("mOverrideDisplayInfo=" + mOverrideDisplayInfo); 437 } 438 } 439
