Romain Guy | 3b748a4 | 2013-04-17 18:54:38 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 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; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.content.pm.PackageInfo; |
| 21 | import android.content.pm.PackageManager; |
| 22 | import android.content.res.Resources; |
| 23 | import android.graphics.Atlas; |
| 24 | import android.graphics.Bitmap; |
| 25 | import android.graphics.Canvas; |
| 26 | import android.graphics.Paint; |
| 27 | import android.graphics.PixelFormat; |
| 28 | import android.graphics.PorterDuff; |
| 29 | import android.graphics.PorterDuffXfermode; |
| 30 | import android.graphics.drawable.Drawable; |
| 31 | import android.os.Environment; |
| 32 | import android.os.RemoteException; |
| 33 | import android.os.SystemProperties; |
| 34 | import android.util.Log; |
| 35 | import android.util.LongSparseArray; |
| 36 | import android.view.GraphicBuffer; |
| 37 | import android.view.IAssetAtlas; |
| 38 | |
| 39 | import java.io.BufferedReader; |
| 40 | import java.io.BufferedWriter; |
| 41 | import java.io.File; |
| 42 | import java.io.FileInputStream; |
| 43 | import java.io.FileNotFoundException; |
| 44 | import java.io.FileOutputStream; |
| 45 | import java.io.IOException; |
| 46 | import java.io.InputStreamReader; |
| 47 | import java.io.OutputStreamWriter; |
| 48 | import java.util.ArrayList; |
| 49 | import java.util.Collections; |
| 50 | import java.util.Comparator; |
| 51 | import java.util.List; |
| 52 | import java.util.concurrent.CountDownLatch; |
| 53 | import java.util.concurrent.TimeUnit; |
| 54 | import java.util.concurrent.atomic.AtomicBoolean; |
| 55 | |
| 56 | /** |
| 57 | * This service is responsible for packing preloaded bitmaps into a single |
| 58 | * atlas texture. The resulting texture can be shared across processes to |
| 59 | * reduce overall memory usage. |
| 60 | * |
| 61 | * @hide |
| 62 | */ |
| 63 | public class AssetAtlasService extends IAssetAtlas.Stub { |
| 64 | /** |
| 65 | * Name of the <code>AssetAtlasService</code>. |
| 66 | */ |
| 67 | public static final String ASSET_ATLAS_SERVICE = "assetatlas"; |
| 68 | |
| 69 | private static final String LOG_TAG = "Atlas"; |
| 70 | |
| 71 | // Turns debug logs on/off. Debug logs are kept to a minimum and should |
| 72 | // remain on to diagnose issues |
| 73 | private static final boolean DEBUG_ATLAS = true; |
| 74 | |
| 75 | // When set to true the content of the atlas will be saved to disk |
| 76 | // in /data/system/atlas.png. The shared GraphicBuffer may be empty |
| 77 | private static final boolean DEBUG_ATLAS_TEXTURE = false; |
| 78 | |
| 79 | // Minimum size in pixels to consider for the resulting texture |
| 80 | private static final int MIN_SIZE = 768; |
| 81 | // Maximum size in pixels to consider for the resulting texture |
| 82 | private static final int MAX_SIZE = 2048; |
| 83 | // Increment in number of pixels between size variants when looking |
| 84 | // for the best texture dimensions |
| 85 | private static final int STEP = 64; |
| 86 | |
| 87 | // This percentage of the total number of pixels represents the minimum |
| 88 | // number of pixels we want to be able to pack in the atlas |
| 89 | private static final float PACKING_THRESHOLD = 0.8f; |
| 90 | |
| 91 | // Defines the number of int fields used to represent a single entry |
| 92 | // in the atlas map. This number defines the size of the array returned |
| 93 | // by the getMap(). See the mAtlasMap field for more information |
| 94 | private static final int ATLAS_MAP_ENTRY_FIELD_COUNT = 4; |
| 95 | |
| 96 | // Specifies how our GraphicBuffer will be used. To get proper swizzling |
| 97 | // the buffer will be written to using OpenGL (from JNI) so we can leave |
| 98 | // the software flag set to "never" |
| 99 | private static final int GRAPHIC_BUFFER_USAGE = GraphicBuffer.USAGE_SW_READ_NEVER | |
| 100 | GraphicBuffer.USAGE_SW_WRITE_NEVER | GraphicBuffer.USAGE_HW_TEXTURE; |
| 101 | |
| 102 | // This boolean is set to true if an atlas was successfully |
| 103 | // computed and rendered |
| 104 | private final AtomicBoolean mAtlasReady = new AtomicBoolean(false); |
| 105 | |
| 106 | private final Context mContext; |
| 107 | |
| 108 | // Version name of the current build, used to identify changes to assets list |
| 109 | private final String mVersionName; |
| 110 | |
| 111 | // Holds the atlas' data. This buffer can be mapped to |
| 112 | // OpenGL using an EGLImage |
| 113 | private GraphicBuffer mBuffer; |
| 114 | |
| 115 | // Describes how bitmaps are placed in the atlas. Each bitmap is |
| 116 | // represented by several entries in the array: |
Ashok Bhat | 17ab38f | 2014-01-27 16:00:23 +0000 | [diff] [blame] | 117 | // long0: SkBitmap*, the native bitmap object |
| 118 | // long1: x position |
| 119 | // long2: y position |
| 120 | // long3: rotated, 1 if the bitmap must be rotated, 0 otherwise |
| 121 | private long[] mAtlasMap; |
Romain Guy | 3b748a4 | 2013-04-17 18:54:38 -0700 | [diff] [blame] | 122 | |
| 123 | /** |
| 124 | * Creates a new service. Upon creating, the service will gather the list of |
| 125 | * assets to consider for packing into the atlas and spawn a new thread to |
| 126 | * start the packing work. |
| 127 | * |
| 128 | * @param context The context giving access to preloaded resources |
| 129 | */ |
| 130 | public AssetAtlasService(Context context) { |
| 131 | mContext = context; |
| 132 | mVersionName = queryVersionName(context); |
| 133 | |
| 134 | ArrayList<Bitmap> bitmaps = new ArrayList<Bitmap>(300); |
| 135 | int totalPixelCount = 0; |
| 136 | |
| 137 | // We only care about drawables that hold bitmaps |
| 138 | final Resources resources = context.getResources(); |
| 139 | final LongSparseArray<Drawable.ConstantState> drawables = resources.getPreloadedDrawables(); |
| 140 | |
| 141 | final int count = drawables.size(); |
| 142 | for (int i = 0; i < count; i++) { |
| 143 | final Bitmap bitmap = drawables.valueAt(i).getBitmap(); |
| 144 | if (bitmap != null && bitmap.getConfig() == Bitmap.Config.ARGB_8888) { |
| 145 | bitmaps.add(bitmap); |
| 146 | totalPixelCount += bitmap.getWidth() * bitmap.getHeight(); |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | // Our algorithms perform better when the bitmaps are first sorted |
| 151 | // The comparator will sort the bitmap by width first, then by height |
| 152 | Collections.sort(bitmaps, new Comparator<Bitmap>() { |
| 153 | @Override |
| 154 | public int compare(Bitmap b1, Bitmap b2) { |
| 155 | if (b1.getWidth() == b2.getWidth()) { |
| 156 | return b2.getHeight() - b1.getHeight(); |
| 157 | } |
| 158 | return b2.getWidth() - b1.getWidth(); |
| 159 | } |
| 160 | }); |
| 161 | |
| 162 | // Kick off the packing work on a worker thread |
| 163 | new Thread(new Renderer(bitmaps, totalPixelCount)).start(); |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Queries the version name stored in framework's AndroidManifest. |
| 168 | * The version name can be used to identify possible changes to |
| 169 | * framework resources. |
| 170 | * |
| 171 | * @see #getBuildIdentifier(String) |
| 172 | */ |
| 173 | private static String queryVersionName(Context context) { |
| 174 | try { |
| 175 | String packageName = context.getPackageName(); |
| 176 | PackageInfo info = context.getPackageManager().getPackageInfo(packageName, 0); |
| 177 | return info.versionName; |
| 178 | } catch (PackageManager.NameNotFoundException e) { |
| 179 | Log.w(LOG_TAG, "Could not get package info", e); |
| 180 | } |
| 181 | return null; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Callback invoked by the server thread to indicate we can now run |
| 186 | * 3rd party code. |
| 187 | */ |
Svetoslav Ganov | a002715 | 2013-06-25 14:59:53 -0700 | [diff] [blame] | 188 | public void systemRunning() { |
Romain Guy | 3b748a4 | 2013-04-17 18:54:38 -0700 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | /** |
| 192 | * The renderer does all the work: |
| 193 | */ |
| 194 | private class Renderer implements Runnable { |
| 195 | private final ArrayList<Bitmap> mBitmaps; |
| 196 | private final int mPixelCount; |
| 197 | |
Ashok Bhat | 17ab38f | 2014-01-27 16:00:23 +0000 | [diff] [blame] | 198 | private long mNativeBitmap; |
Romain Guy | 3b748a4 | 2013-04-17 18:54:38 -0700 | [diff] [blame] | 199 | |
| 200 | // Used for debugging only |
| 201 | private Bitmap mAtlasBitmap; |
| 202 | |
| 203 | Renderer(ArrayList<Bitmap> bitmaps, int pixelCount) { |
| 204 | mBitmaps = bitmaps; |
| 205 | mPixelCount = pixelCount; |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * 1. On first boot or after every update, brute-force through all the |
| 210 | * possible atlas configurations and look for the best one (maximimize |
| 211 | * number of packed assets and minimize texture size) |
| 212 | * a. If a best configuration was computed, write it out to disk for |
| 213 | * future use |
| 214 | * 2. Read best configuration from disk |
| 215 | * 3. Compute the packing using the best configuration |
| 216 | * 4. Allocate a GraphicBuffer |
| 217 | * 5. Render assets in the buffer |
| 218 | */ |
| 219 | @Override |
| 220 | public void run() { |
| 221 | Configuration config = chooseConfiguration(mBitmaps, mPixelCount, mVersionName); |
| 222 | if (DEBUG_ATLAS) Log.d(LOG_TAG, "Loaded configuration: " + config); |
| 223 | |
| 224 | if (config != null) { |
| 225 | mBuffer = GraphicBuffer.create(config.width, config.height, |
| 226 | PixelFormat.RGBA_8888, GRAPHIC_BUFFER_USAGE); |
| 227 | |
| 228 | if (mBuffer != null) { |
| 229 | Atlas atlas = new Atlas(config.type, config.width, config.height, config.flags); |
| 230 | if (renderAtlas(mBuffer, atlas, config.count)) { |
| 231 | mAtlasReady.set(true); |
| 232 | } |
| 233 | } |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * Renders a list of bitmaps into the atlas. The position of each bitmap |
| 239 | * was decided by the packing algorithm and will be honored by this |
| 240 | * method. If need be this method will also rotate bitmaps. |
| 241 | * |
| 242 | * @param buffer The buffer to render the atlas entries into |
| 243 | * @param atlas The atlas to pack the bitmaps into |
| 244 | * @param packCount The number of bitmaps that will be packed in the atlas |
| 245 | * |
| 246 | * @return true if the atlas was rendered, false otherwise |
| 247 | */ |
| 248 | @SuppressWarnings("MismatchedReadAndWriteOfArray") |
| 249 | private boolean renderAtlas(GraphicBuffer buffer, Atlas atlas, int packCount) { |
| 250 | // Use a Source blend mode to improve performance, the target bitmap |
| 251 | // will be zero'd out so there's no need to waste time applying blending |
| 252 | final Paint paint = new Paint(); |
| 253 | paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC)); |
| 254 | |
| 255 | // We always render the atlas into a bitmap. This bitmap is then |
| 256 | // uploaded into the GraphicBuffer using OpenGL to swizzle the content |
| 257 | final Canvas canvas = acquireCanvas(buffer.getWidth(), buffer.getHeight()); |
| 258 | if (canvas == null) return false; |
| 259 | |
| 260 | final Atlas.Entry entry = new Atlas.Entry(); |
| 261 | |
Ashok Bhat | 17ab38f | 2014-01-27 16:00:23 +0000 | [diff] [blame] | 262 | mAtlasMap = new long[packCount * ATLAS_MAP_ENTRY_FIELD_COUNT]; |
| 263 | long[] atlasMap = mAtlasMap; |
Romain Guy | 3b748a4 | 2013-04-17 18:54:38 -0700 | [diff] [blame] | 264 | int mapIndex = 0; |
| 265 | |
| 266 | boolean result = false; |
| 267 | try { |
| 268 | final long startRender = System.nanoTime(); |
| 269 | final int count = mBitmaps.size(); |
| 270 | |
| 271 | for (int i = 0; i < count; i++) { |
| 272 | final Bitmap bitmap = mBitmaps.get(i); |
| 273 | if (atlas.pack(bitmap.getWidth(), bitmap.getHeight(), entry) != null) { |
| 274 | // We have more bitmaps to pack than the current configuration |
| 275 | // says, we were most likely not able to detect a change in the |
| 276 | // list of preloaded drawables, abort and delete the configuration |
| 277 | if (mapIndex >= mAtlasMap.length) { |
| 278 | deleteDataFile(); |
| 279 | break; |
| 280 | } |
| 281 | |
| 282 | canvas.save(); |
| 283 | canvas.translate(entry.x, entry.y); |
| 284 | if (entry.rotated) { |
| 285 | canvas.translate(bitmap.getHeight(), 0.0f); |
| 286 | canvas.rotate(90.0f); |
| 287 | } |
| 288 | canvas.drawBitmap(bitmap, 0.0f, 0.0f, null); |
| 289 | canvas.restore(); |
Ashok Bhat | 17ab38f | 2014-01-27 16:00:23 +0000 | [diff] [blame] | 290 | atlasMap[mapIndex++] = bitmap.mNativeBitmap; |
Romain Guy | 3b748a4 | 2013-04-17 18:54:38 -0700 | [diff] [blame] | 291 | atlasMap[mapIndex++] = entry.x; |
| 292 | atlasMap[mapIndex++] = entry.y; |
| 293 | atlasMap[mapIndex++] = entry.rotated ? 1 : 0; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | final long endRender = System.nanoTime(); |
| 298 | if (mNativeBitmap != 0) { |
| 299 | result = nUploadAtlas(buffer, mNativeBitmap); |
| 300 | } |
| 301 | |
| 302 | final long endUpload = System.nanoTime(); |
| 303 | if (DEBUG_ATLAS) { |
| 304 | float renderDuration = (endRender - startRender) / 1000.0f / 1000.0f; |
| 305 | float uploadDuration = (endUpload - endRender) / 1000.0f / 1000.0f; |
| 306 | Log.d(LOG_TAG, String.format("Rendered atlas in %.2fms (%.2f+%.2fms)", |
| 307 | renderDuration + uploadDuration, renderDuration, uploadDuration)); |
| 308 | } |
| 309 | |
| 310 | } finally { |
| 311 | releaseCanvas(canvas); |
| 312 | } |
| 313 | |
| 314 | return result; |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * Returns a Canvas for the specified buffer. If {@link #DEBUG_ATLAS_TEXTURE} |
| 319 | * is turned on, the returned Canvas will render into a local bitmap that |
| 320 | * will then be saved out to disk for debugging purposes. |
| 321 | * @param width |
| 322 | * @param height |
| 323 | */ |
| 324 | private Canvas acquireCanvas(int width, int height) { |
| 325 | if (DEBUG_ATLAS_TEXTURE) { |
| 326 | mAtlasBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); |
| 327 | return new Canvas(mAtlasBitmap); |
| 328 | } else { |
| 329 | Canvas canvas = new Canvas(); |
| 330 | mNativeBitmap = nAcquireAtlasCanvas(canvas, width, height); |
| 331 | return canvas; |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | /** |
| 336 | * Releases the canvas used to render into the buffer. Calling this method |
| 337 | * will release any resource previously acquired. If {@link #DEBUG_ATLAS_TEXTURE} |
| 338 | * is turend on, calling this method will write the content of the atlas |
| 339 | * to disk in /data/system/atlas.png for debugging. |
| 340 | */ |
| 341 | private void releaseCanvas(Canvas canvas) { |
| 342 | if (DEBUG_ATLAS_TEXTURE) { |
| 343 | canvas.setBitmap(null); |
| 344 | |
| 345 | File systemDirectory = new File(Environment.getDataDirectory(), "system"); |
| 346 | File dataFile = new File(systemDirectory, "atlas.png"); |
| 347 | |
| 348 | try { |
| 349 | FileOutputStream out = new FileOutputStream(dataFile); |
| 350 | mAtlasBitmap.compress(Bitmap.CompressFormat.PNG, 100, out); |
| 351 | out.close(); |
| 352 | } catch (FileNotFoundException e) { |
| 353 | // Ignore |
| 354 | } catch (IOException e) { |
| 355 | // Ignore |
| 356 | } |
| 357 | |
| 358 | mAtlasBitmap.recycle(); |
| 359 | mAtlasBitmap = null; |
| 360 | } else { |
| 361 | nReleaseAtlasCanvas(canvas, mNativeBitmap); |
| 362 | } |
| 363 | } |
| 364 | } |
| 365 | |
Ashok Bhat | 17ab38f | 2014-01-27 16:00:23 +0000 | [diff] [blame] | 366 | private static native long nAcquireAtlasCanvas(Canvas canvas, int width, int height); |
| 367 | private static native void nReleaseAtlasCanvas(Canvas canvas, long bitmap); |
| 368 | private static native boolean nUploadAtlas(GraphicBuffer buffer, long bitmap); |
Romain Guy | 3b748a4 | 2013-04-17 18:54:38 -0700 | [diff] [blame] | 369 | |
| 370 | @Override |
Romain Guy | 80b12fc | 2013-05-29 15:54:25 -0700 | [diff] [blame] | 371 | public boolean isCompatible(int ppid) { |
| 372 | return ppid == android.os.Process.myPpid(); |
| 373 | } |
| 374 | |
| 375 | @Override |
Romain Guy | 3b748a4 | 2013-04-17 18:54:38 -0700 | [diff] [blame] | 376 | public GraphicBuffer getBuffer() throws RemoteException { |
| 377 | return mAtlasReady.get() ? mBuffer : null; |
| 378 | } |
| 379 | |
| 380 | @Override |
Ashok Bhat | 17ab38f | 2014-01-27 16:00:23 +0000 | [diff] [blame] | 381 | public long[] getMap() throws RemoteException { |
Romain Guy | 3b748a4 | 2013-04-17 18:54:38 -0700 | [diff] [blame] | 382 | return mAtlasReady.get() ? mAtlasMap : null; |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * Finds the best atlas configuration to pack the list of supplied bitmaps. |
| 387 | * This method takes advantage of multi-core systems by spawning a number |
| 388 | * of threads equal to the number of available cores. |
| 389 | */ |
| 390 | private static Configuration computeBestConfiguration( |
| 391 | ArrayList<Bitmap> bitmaps, int pixelCount) { |
| 392 | if (DEBUG_ATLAS) Log.d(LOG_TAG, "Computing best atlas configuration..."); |
| 393 | |
| 394 | long begin = System.nanoTime(); |
| 395 | List<WorkerResult> results = Collections.synchronizedList(new ArrayList<WorkerResult>()); |
| 396 | |
| 397 | // Don't bother with an extra thread if there's only one processor |
| 398 | int cpuCount = Runtime.getRuntime().availableProcessors(); |
| 399 | if (cpuCount == 1) { |
| 400 | new ComputeWorker(MIN_SIZE, MAX_SIZE, STEP, bitmaps, pixelCount, results, null).run(); |
| 401 | } else { |
| 402 | int start = MIN_SIZE; |
| 403 | int end = MAX_SIZE - (cpuCount - 1) * STEP; |
| 404 | int step = STEP * cpuCount; |
| 405 | |
| 406 | final CountDownLatch signal = new CountDownLatch(cpuCount); |
| 407 | |
| 408 | for (int i = 0; i < cpuCount; i++, start += STEP, end += STEP) { |
| 409 | ComputeWorker worker = new ComputeWorker(start, end, step, |
| 410 | bitmaps, pixelCount, results, signal); |
| 411 | new Thread(worker, "Atlas Worker #" + (i + 1)).start(); |
| 412 | } |
| 413 | |
| 414 | try { |
| 415 | signal.await(10, TimeUnit.SECONDS); |
| 416 | } catch (InterruptedException e) { |
| 417 | Log.w(LOG_TAG, "Could not complete configuration computation"); |
| 418 | return null; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | // Maximize the number of packed bitmaps, minimize the texture size |
| 423 | Collections.sort(results, new Comparator<WorkerResult>() { |
| 424 | @Override |
| 425 | public int compare(WorkerResult r1, WorkerResult r2) { |
| 426 | int delta = r2.count - r1.count; |
| 427 | if (delta != 0) return delta; |
| 428 | return r1.width * r1.height - r2.width * r2.height; |
| 429 | } |
| 430 | }); |
| 431 | |
| 432 | if (DEBUG_ATLAS) { |
| 433 | float delay = (System.nanoTime() - begin) / 1000.0f / 1000.0f / 1000.0f; |
| 434 | Log.d(LOG_TAG, String.format("Found best atlas configuration in %.2fs", delay)); |
| 435 | } |
| 436 | |
| 437 | WorkerResult result = results.get(0); |
| 438 | return new Configuration(result.type, result.width, result.height, result.count); |
| 439 | } |
| 440 | |
| 441 | /** |
| 442 | * Returns the path to the file containing the best computed |
| 443 | * atlas configuration. |
| 444 | */ |
| 445 | private static File getDataFile() { |
| 446 | File systemDirectory = new File(Environment.getDataDirectory(), "system"); |
| 447 | return new File(systemDirectory, "framework_atlas.config"); |
| 448 | } |
| 449 | |
| 450 | private static void deleteDataFile() { |
| 451 | Log.w(LOG_TAG, "Current configuration inconsistent with assets list"); |
| 452 | if (!getDataFile().delete()) { |
| 453 | Log.w(LOG_TAG, "Could not delete the current configuration"); |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | private File getFrameworkResourcesFile() { |
| 458 | return new File(mContext.getApplicationInfo().sourceDir); |
| 459 | } |
| 460 | |
| 461 | /** |
| 462 | * Returns the best known atlas configuration. This method will either |
| 463 | * read the configuration from disk or start a brute-force search |
| 464 | * and save the result out to disk. |
| 465 | */ |
| 466 | private Configuration chooseConfiguration(ArrayList<Bitmap> bitmaps, int pixelCount, |
| 467 | String versionName) { |
| 468 | Configuration config = null; |
| 469 | |
| 470 | final File dataFile = getDataFile(); |
| 471 | if (dataFile.exists()) { |
| 472 | config = readConfiguration(dataFile, versionName); |
| 473 | } |
| 474 | |
| 475 | if (config == null) { |
| 476 | config = computeBestConfiguration(bitmaps, pixelCount); |
| 477 | if (config != null) writeConfiguration(config, dataFile, versionName); |
| 478 | } |
| 479 | |
| 480 | return config; |
| 481 | } |
| 482 | |
| 483 | /** |
| 484 | * Writes the specified atlas configuration to the specified file. |
| 485 | */ |
| 486 | private void writeConfiguration(Configuration config, File file, String versionName) { |
| 487 | BufferedWriter writer = null; |
| 488 | try { |
| 489 | writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file))); |
| 490 | writer.write(getBuildIdentifier(versionName)); |
| 491 | writer.newLine(); |
| 492 | writer.write(config.type.toString()); |
| 493 | writer.newLine(); |
| 494 | writer.write(String.valueOf(config.width)); |
| 495 | writer.newLine(); |
| 496 | writer.write(String.valueOf(config.height)); |
| 497 | writer.newLine(); |
| 498 | writer.write(String.valueOf(config.count)); |
| 499 | writer.newLine(); |
| 500 | writer.write(String.valueOf(config.flags)); |
| 501 | writer.newLine(); |
| 502 | } catch (FileNotFoundException e) { |
| 503 | Log.w(LOG_TAG, "Could not write " + file, e); |
| 504 | } catch (IOException e) { |
| 505 | Log.w(LOG_TAG, "Could not write " + file, e); |
| 506 | } finally { |
| 507 | if (writer != null) { |
| 508 | try { |
| 509 | writer.close(); |
| 510 | } catch (IOException e) { |
| 511 | // Ignore |
| 512 | } |
| 513 | } |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * Reads an atlas configuration from the specified file. This method |
| 519 | * returns null if an error occurs or if the configuration is invalid. |
| 520 | */ |
| 521 | private Configuration readConfiguration(File file, String versionName) { |
| 522 | BufferedReader reader = null; |
| 523 | Configuration config = null; |
| 524 | try { |
| 525 | reader = new BufferedReader(new InputStreamReader(new FileInputStream(file))); |
| 526 | |
| 527 | if (checkBuildIdentifier(reader, versionName)) { |
| 528 | Atlas.Type type = Atlas.Type.valueOf(reader.readLine()); |
| 529 | int width = readInt(reader, MIN_SIZE, MAX_SIZE); |
| 530 | int height = readInt(reader, MIN_SIZE, MAX_SIZE); |
| 531 | int count = readInt(reader, 0, Integer.MAX_VALUE); |
| 532 | int flags = readInt(reader, Integer.MIN_VALUE, Integer.MAX_VALUE); |
| 533 | |
| 534 | config = new Configuration(type, width, height, count, flags); |
| 535 | } |
| 536 | } catch (IllegalArgumentException e) { |
| 537 | Log.w(LOG_TAG, "Invalid parameter value in " + file, e); |
| 538 | } catch (FileNotFoundException e) { |
| 539 | Log.w(LOG_TAG, "Could not read " + file, e); |
| 540 | } catch (IOException e) { |
| 541 | Log.w(LOG_TAG, "Could not read " + file, e); |
| 542 | } finally { |
| 543 | if (reader != null) { |
| 544 | try { |
| 545 | reader.close(); |
| 546 | } catch (IOException e) { |
| 547 | // Ignore |
| 548 | } |
| 549 | } |
| 550 | } |
| 551 | return config; |
| 552 | } |
| 553 | |
| 554 | private static int readInt(BufferedReader reader, int min, int max) throws IOException { |
| 555 | return Math.max(min, Math.min(max, Integer.parseInt(reader.readLine()))); |
| 556 | } |
| 557 | |
| 558 | /** |
| 559 | * Compares the next line in the specified buffered reader to the current |
| 560 | * build identifier. Returns whether the two values are equal. |
| 561 | * |
| 562 | * @see #getBuildIdentifier(String) |
| 563 | */ |
| 564 | private boolean checkBuildIdentifier(BufferedReader reader, String versionName) |
| 565 | throws IOException { |
| 566 | String deviceBuildId = getBuildIdentifier(versionName); |
| 567 | String buildId = reader.readLine(); |
| 568 | return deviceBuildId.equals(buildId); |
| 569 | } |
| 570 | |
| 571 | /** |
| 572 | * Returns an identifier for the current build that can be used to detect |
| 573 | * likely changes to framework resources. The build identifier is made of |
| 574 | * several distinct values: |
| 575 | * |
| 576 | * build fingerprint/framework version name/file size of framework resources apk |
| 577 | * |
| 578 | * Only the build fingerprint should be necessary on user builds but |
| 579 | * the other values are useful to detect changes on eng builds during |
| 580 | * development. |
| 581 | * |
| 582 | * This identifier does not attempt to be exact: a new identifier does not |
| 583 | * necessarily mean the preloaded drawables have changed. It is important |
| 584 | * however that whenever the list of preloaded drawables changes, this |
| 585 | * identifier changes as well. |
| 586 | * |
| 587 | * @see #checkBuildIdentifier(java.io.BufferedReader, String) |
| 588 | */ |
| 589 | private String getBuildIdentifier(String versionName) { |
| 590 | return SystemProperties.get("ro.build.fingerprint", "") + '/' + versionName + '/' + |
| 591 | String.valueOf(getFrameworkResourcesFile().length()); |
| 592 | } |
| 593 | |
| 594 | /** |
| 595 | * Atlas configuration. Specifies the algorithm, dimensions and flags to use. |
| 596 | */ |
| 597 | private static class Configuration { |
| 598 | final Atlas.Type type; |
| 599 | final int width; |
| 600 | final int height; |
| 601 | final int count; |
| 602 | final int flags; |
| 603 | |
| 604 | Configuration(Atlas.Type type, int width, int height, int count) { |
| 605 | this(type, width, height, count, Atlas.FLAG_DEFAULTS); |
| 606 | } |
| 607 | |
| 608 | Configuration(Atlas.Type type, int width, int height, int count, int flags) { |
| 609 | this.type = type; |
| 610 | this.width = width; |
| 611 | this.height = height; |
| 612 | this.count = count; |
| 613 | this.flags = flags; |
| 614 | } |
| 615 | |
| 616 | @Override |
| 617 | public String toString() { |
| 618 | return type.toString() + " (" + width + "x" + height + ") flags=0x" + |
| 619 | Integer.toHexString(flags) + " count=" + count; |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | /** |
| 624 | * Used during the brute-force search to gather information about each |
| 625 | * variant of the packing algorithm. |
| 626 | */ |
| 627 | private static class WorkerResult { |
| 628 | Atlas.Type type; |
| 629 | int width; |
| 630 | int height; |
| 631 | int count; |
| 632 | |
| 633 | WorkerResult(Atlas.Type type, int width, int height, int count) { |
| 634 | this.type = type; |
| 635 | this.width = width; |
| 636 | this.height = height; |
| 637 | this.count = count; |
| 638 | } |
| 639 | |
| 640 | @Override |
| 641 | public String toString() { |
| 642 | return String.format("%s %dx%d", type.toString(), width, height); |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | /** |
| 647 | * A compute worker will try a finite number of variations of the packing |
| 648 | * algorithms and save the results in a supplied list. |
| 649 | */ |
| 650 | private static class ComputeWorker implements Runnable { |
| 651 | private final int mStart; |
| 652 | private final int mEnd; |
| 653 | private final int mStep; |
| 654 | private final List<Bitmap> mBitmaps; |
| 655 | private final List<WorkerResult> mResults; |
| 656 | private final CountDownLatch mSignal; |
| 657 | private final int mThreshold; |
| 658 | |
| 659 | /** |
| 660 | * Creates a new compute worker to brute-force through a range of |
| 661 | * packing algorithms variants. |
| 662 | * |
| 663 | * @param start The minimum texture width to try |
| 664 | * @param end The maximum texture width to try |
| 665 | * @param step The number of pixels to increment the texture width by at each step |
| 666 | * @param bitmaps The list of bitmaps to pack in the atlas |
| 667 | * @param pixelCount The total number of pixels occupied by the list of bitmaps |
| 668 | * @param results The list of results in which to save the brute-force search results |
| 669 | * @param signal Latch to decrement when this worker is done, may be null |
| 670 | */ |
| 671 | ComputeWorker(int start, int end, int step, List<Bitmap> bitmaps, int pixelCount, |
| 672 | List<WorkerResult> results, CountDownLatch signal) { |
| 673 | mStart = start; |
| 674 | mEnd = end; |
| 675 | mStep = step; |
| 676 | mBitmaps = bitmaps; |
| 677 | mResults = results; |
| 678 | mSignal = signal; |
| 679 | |
| 680 | // Minimum number of pixels we want to be able to pack |
| 681 | int threshold = (int) (pixelCount * PACKING_THRESHOLD); |
| 682 | // Make sure we can find at least one configuration |
| 683 | while (threshold > MAX_SIZE * MAX_SIZE) { |
| 684 | threshold >>= 1; |
| 685 | } |
| 686 | mThreshold = threshold; |
| 687 | } |
| 688 | |
| 689 | @Override |
| 690 | public void run() { |
| 691 | if (DEBUG_ATLAS) Log.d(LOG_TAG, "Running " + Thread.currentThread().getName()); |
| 692 | |
| 693 | Atlas.Entry entry = new Atlas.Entry(); |
| 694 | for (Atlas.Type type : Atlas.Type.values()) { |
| 695 | for (int width = mStart; width < mEnd; width += mStep) { |
| 696 | for (int height = MIN_SIZE; height < MAX_SIZE; height += STEP) { |
| 697 | // If the atlas is not big enough, skip it |
| 698 | if (width * height <= mThreshold) continue; |
| 699 | |
| 700 | final int count = packBitmaps(type, width, height, entry); |
| 701 | if (count > 0) { |
| 702 | mResults.add(new WorkerResult(type, width, height, count)); |
| 703 | // If we were able to pack everything let's stop here |
| 704 | // Increasing the height further won't make things better |
| 705 | if (count == mBitmaps.size()) { |
| 706 | break; |
| 707 | } |
| 708 | } |
| 709 | } |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | if (mSignal != null) { |
| 714 | mSignal.countDown(); |
| 715 | } |
| 716 | } |
| 717 | |
| 718 | private int packBitmaps(Atlas.Type type, int width, int height, Atlas.Entry entry) { |
| 719 | int total = 0; |
| 720 | Atlas atlas = new Atlas(type, width, height); |
| 721 | |
| 722 | final int count = mBitmaps.size(); |
| 723 | for (int i = 0; i < count; i++) { |
| 724 | final Bitmap bitmap = mBitmaps.get(i); |
| 725 | if (atlas.pack(bitmap.getWidth(), bitmap.getHeight(), entry) != null) { |
| 726 | total++; |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | return total; |
| 731 | } |
| 732 | } |
| 733 | } |