1 /* 2 * Copyright (C) 2006 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 android.graphics; 18 19 import android.os.Parcel; 20 import android.os.Parcelable; 21 import android.util.DisplayMetrics; 22 import java.io.OutputStream; 23 import java.nio.Buffer; 24 import java.nio.ByteBuffer; 25 import java.nio.IntBuffer; 26 import java.nio.ShortBuffer; 27 28 public final class Bitmap implements Parcelable { 29 30 /** 31 * Indicates that the bitmap was created for an unknown pixel density. 32 * 33 * @see Bitmap#getDensity() 34 * @see Bitmap#setDensity(int) 35 */ 36 public static final int DENSITY_NONE = 0; 37 38 /** 39 * Note: mNativeBitmap is used by FaceDetector_jni.cpp 40 * Don't change/rename without updating FaceDetector_jni.cpp 41 * 42 * @hide 43 */ 44 public final int mNativeBitmap; 45 46 /** 47 * Backing buffer for the Bitmap. 48 * Made public for quick access from drawing methods -- do NOT modify 49 * from outside this class. 50 * 51 * @hide 52 */ 53 public byte[] mBuffer; 54 55 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) // Keep to finalize native resources 56 private final BitmapFinalizer mFinalizer; 57 58 private final boolean mIsMutable; 59 private byte[] mNinePatchChunk; // may be null 60 private int mWidth = -1; 61 private int mHeight = -1; 62 private boolean mRecycled; 63 64 // Package-scoped for fast access. 65 /*package*/ int mDensity = sDefaultDensity = getDefaultDensity(); 66 67 private static volatile Matrix sScaleMatrix; 68 69 private static volatile int sDefaultDensity = -1; 70 71 /** 72 * For backwards compatibility, allows the app layer to change the default 73 * density when running old apps. 74 * @hide 75 */ 76 public static void setDefaultDensity(int density) { 77 sDefaultDensity = density; 78 } 79 80 /*package*/ static int getDefaultDensity() { 81 if (sDefaultDensity >= 0) { 82 return sDefaultDensity; 83 } 84 sDefaultDensity = DisplayMetrics.DENSITY_DEVICE; 85 return sDefaultDensity; 86 } 87 88 /** 89 * @noinspection UnusedDeclaration 90 */ 91 /* Private constructor that must received an already allocated native 92 bitmap int (pointer). 93 94 This can be called from JNI code. 95 */ 96 /*package*/ Bitmap(int nativeBitmap, byte[] buffer, boolean isMutable, byte[] ninePatchChunk, 97 int density) { 98 if (nativeBitmap == 0) { 99 throw new RuntimeException("internal error: native bitmap is 0"); 100 } 101 102 mBuffer = buffer; 103 // we delete this in our finalizer 104 mNativeBitmap = nativeBitmap; 105 mFinalizer = new BitmapFinalizer(nativeBitmap); 106 107 mIsMutable = isMutable; 108 mNinePatchChunk = ninePatchChunk; 109 if (density >= 0) { 110 mDensity = density; 111 } 112 } 113 114 /** 115 * <p>Returns the density for this bitmap.</p> 116 * 117 * <p>The default density is the same density as the current display, 118 * unless the current application does not support different screen 119 * densities in which case it is 120 * {@link android.util.DisplayMetrics#DENSITY_DEFAULT}. Note that 121 * compatibility mode is determined by the application that was initially 122 * loaded into a process -- applications that share the same process should 123 * all have the same compatibility, or ensure they explicitly set the 124 * density of their bitmaps appropriately.</p> 125 * 126 * @return A scaling factor of the default density or {@link #DENSITY_NONE} 127 * if the scaling factor is unknown. 128 * 129 * @see #setDensity(int) 130 * @see android.util.DisplayMetrics#DENSITY_DEFAULT 131 * @see android.util.DisplayMetrics#densityDpi 132 * @see #DENSITY_NONE 133 */ 134 public int getDensity() { 135 return mDensity; 136 } 137 138 /** 139 * <p>Specifies the density for this bitmap. When the bitmap is 140 * drawn to a Canvas that also has a density, it will be scaled 141 * appropriately.</p> 142 * 143 * @param density The density scaling factor to use with this bitmap or 144 * {@link #DENSITY_NONE} if the density is unknown. 145 * 146 * @see #getDensity() 147 * @see android.util.DisplayMetrics#DENSITY_DEFAULT 148 * @see android.util.DisplayMetrics#densityDpi 149 * @see #DENSITY_NONE 150 */ 151 public void setDensity(int density) { 152 mDensity = density; 153 } 154 155 /** 156 * Sets the nine patch chunk. 157 * 158 * @param chunk The definition of the nine patch 159 * 160 * @hide 161 */ 162 public void setNinePatchChunk(byte[] chunk) { 163 mNinePatchChunk = chunk; 164 } 165 166 /** 167 * Free the native object associated with this bitmap, and clear the 168 * reference to the pixel data. This will not free the pixel data synchronously; 169 * it simply allows it to be garbage collected if there are no other references. 170 * The bitmap is marked as "dead", meaning it will throw an exception if 171 * getPixels() or setPixels() is called, and will draw nothing. This operation 172 * cannot be reversed, so it should only be called if you are sure there are no 173 * further uses for the bitmap. This is an advanced call, and normally need 174 * not be called, since the normal GC process will free up this memory when 175 * there are no more references to this bitmap. 176 */ 177 public void recycle() { 178 if (!mRecycled) { 179 mBuffer = null; 180 nativeRecycle(mNativeBitmap); 181 mNinePatchChunk = null; 182 mRecycled = true; 183 } 184 } 185 186 /** 187 * Returns true if this bitmap has been recycled. If so, then it is an error 188 * to try to access its pixels, and the bitmap will not draw. 189 * 190 * @return true if the bitmap has been recycled 191 */ 192 public final boolean isRecycled() { 193 return mRecycled; 194 } 195 196 /** 197 * Returns the generation ID of this bitmap. The generation ID changes 198 * whenever the bitmap is modified. This can be used as an efficient way to 199 * check if a bitmap has changed. 200 * 201 * @return The current generation ID for this bitmap. 202 */ 203 public int getGenerationId() { 204 return nativeGenerationId(mNativeBitmap); 205 } 206 207 /** 208 * This is called by methods that want to throw an exception if the bitmap 209 * has already been recycled. 210 */ 211 private void checkRecycled(String errorMessage) { 212 if (mRecycled) { 213 throw new IllegalStateException(errorMessage); 214 } 215 } 216 217 /** 218 * Common code for checking that x and y are >= 0 219 * 220 * @param x x coordinate to ensure is >= 0 221 * @param y y coordinate to ensure is >= 0 222 */ 223 private static void checkXYSign(int x, int y) { 224 if (x < 0) { 225 throw new IllegalArgumentException("x must be >= 0"); 226 } 227 if (y < 0) { 228 throw new IllegalArgumentException("y must be >= 0"); 229 } 230 } 231 232 /** 233 * Common code for checking that width and height are > 0 234 * 235 * @param width width to ensure is > 0 236 * @param height height to ensure is > 0 237 */ 238 private static void checkWidthHeight(int width, int height) { 239 if (width <= 0) { 240 throw new IllegalArgumentException("width must be > 0"); 241 } 242 if (height <= 0) { 243 throw new IllegalArgumentException("height must be > 0"); 244 } 245 } 246 247 /** 248 * Possible bitmap configurations. A bitmap configuration describes 249 * how pixels are stored. This affects the quality (color depth) as 250 * well as the ability to display transparent/translucent colors. 251 */ 252 public enum Config { 253 // these native values must match up with the enum in SkBitmap.h 254 255 /** 256 * Each pixel is stored as a single translucency (alpha) channel. 257 * This is very useful to efficiently store masks for instance. 258 * No color information is stored. 259 * With this configuration, each pixel requires 1 byte of memory. 260 */ 261 ALPHA_8 (2), 262 263 /** 264 * Each pixel is stored on 2 bytes and only the RGB channels are 265 * encoded: red is stored with 5 bits of precision (32 possible 266 * values), green is stored with 6 bits of precision (64 possible 267 * values) and blue is stored with 5 bits of precision. 268 * 269 * This configuration can produce slight visual artifacts depending 270 * on the configuration of the source. For instance, without 271 * dithering, the result might show a greenish tint. To get better 272 * results dithering should be applied. 273 * 274 * This configuration may be useful when using opaque bitmaps 275 * that do not require high color fidelity. 276 */ 277 RGB_565 (4), 278 279 /** 280 * Each pixel is stored on 2 bytes. The three RGB color channels 281 * and the alpha channel (translucency) are stored with a 4 bits 282 * precision (16 possible values.) 283 * 284 * This configuration is mostly useful if the application needs 285 * to store translucency information but also needs to save 286 * memory. 287 * 288 * It is recommended to use {@link #ARGB_8888} instead of this 289 * configuration. 290 * 291 * @deprecated Because of the poor quality of this configuration, 292 * it is advised to use {@link #ARGB_8888} instead. 293 */ 294 @Deprecated 295 ARGB_4444 (5), 296 297 /** 298 * Each pixel is stored on 4 bytes. Each channel (RGB and alpha 299 * for translucency) is stored with 8 bits of precision (256 300 * possible values.) 301 * 302 * This configuration is very flexible and offers the best 303 * quality. It should be used whenever possible. 304 */ 305 ARGB_8888 (6); 306 307 final int nativeInt; 308 309 @SuppressWarnings({"deprecation"}) 310 private static Config sConfigs[] = { 311 null, null, ALPHA_8, null, RGB_565, ARGB_4444, ARGB_8888 312 }; 313 314 Config(int ni) { 315 this.nativeInt = ni; 316 } 317 318 static Config nativeToConfig(int ni) { 319 return sConfigs[ni]; 320 } 321 } 322 323 /** 324 * Copy the bitmap's pixels into the specified buffer (allocated by the 325 * caller). An exception is thrown if the buffer is not large enough to 326 * hold all of the pixels (taking into account the number of bytes per 327 * pixel) or if the Buffer subclass is not one of the support types 328 * (ByteBuffer, ShortBuffer, IntBuffer). 329 */ 330 public void copyPixelsToBuffer(Buffer dst) { 331 int elements = dst.remaining(); 332 int shift; 333 if (dst instanceof ByteBuffer) { 334 shift = 0; 335 } else if (dst instanceof ShortBuffer) { 336 shift = 1; 337 } else if (dst instanceof IntBuffer) { 338 shift = 2; 339 } else { 340 throw new RuntimeException("unsupported Buffer subclass"); 341 } 342 343 long bufferSize = (long)elements << shift; 344 long pixelSize = getByteCount(); 345 346 if (bufferSize < pixelSize) { 347 throw new RuntimeException("Buffer not large enough for pixels"); 348 } 349 350 nativeCopyPixelsToBuffer(mNativeBitmap, dst); 351 352 // now update the buffer's position 353 int position = dst.position(); 354 position += pixelSize >> shift; 355 dst.position(position); 356 } 357 358 /** 359 * Copy the pixels from the buffer, beginning at the current position, 360 * overwriting the bitmap's pixels. The data in the buffer is not changed 361 * in any way (unlike setPixels(), which converts from unpremultipled 32bit 362 * to whatever the bitmap's native format is. 363 */ 364 public void copyPixelsFromBuffer(Buffer src) { 365 checkRecycled("copyPixelsFromBuffer called on recycled bitmap"); 366 367 int elements = src.remaining(); 368 int shift; 369 if (src instanceof ByteBuffer) { 370 shift = 0; 371 } else if (src instanceof ShortBuffer) { 372 shift = 1; 373 } else if (src instanceof IntBuffer) { 374 shift = 2; 375 } else { 376 throw new RuntimeException("unsupported Buffer subclass"); 377 } 378 379 long bufferBytes = (long)elements << shift; 380 long bitmapBytes = getByteCount(); 381 382 if (bufferBytes < bitmapBytes) { 383 throw new RuntimeException("Buffer not large enough for pixels"); 384 } 385 386 nativeCopyPixelsFromBuffer(mNativeBitmap, src); 387 } 388 389 /** 390 * Tries to make a new bitmap based on the dimensions of this bitmap, 391 * setting the new bitmap's config to the one specified, and then copying 392 * this bitmap's pixels into the new bitmap. If the conversion is not 393 * supported, or the allocator fails, then this returns NULL. The returned 394 * bitmap initially has the same density as the original. 395 * 396 * @param config The desired config for the resulting bitmap 397 * @param isMutable True if the resulting bitmap should be mutable (i.e. 398 * its pixels can be modified) 399 * @return the new bitmap, or null if the copy could not be made. 400 */ 401 public Bitmap copy(Config config, boolean isMutable) { 402 checkRecycled("Can't copy a recycled bitmap"); 403 Bitmap b = nativeCopy(mNativeBitmap, config.nativeInt, isMutable); 404 if (b != null) { 405 b.mDensity = mDensity; 406 } 407 return b; 408 } 409 410 /** 411 * Creates a new bitmap, scaled from an existing bitmap. 412 * 413 * @param src The source bitmap. 414 * @param dstWidth The new bitmap's desired width. 415 * @param dstHeight The new bitmap's desired height. 416 * @param filter true if the source should be filtered. 417 * @return the new scaled bitmap. 418 */ 419 public static Bitmap createScaledBitmap(Bitmap src, int dstWidth, 420 int dstHeight, boolean filter) { 421 Matrix m; 422 synchronized (Bitmap.class) { 423 // small pool of just 1 matrix 424 m = sScaleMatrix; 425 sScaleMatrix = null; 426 } 427 428 if (m == null) { 429 m = new Matrix(); 430 } 431 432 final int width = src.getWidth(); 433 final int height = src.getHeight(); 434 final float sx = dstWidth / (float)width; 435 final float sy = dstHeight / (float)height; 436 m.setScale(sx, sy); 437 Bitmap b = Bitmap.createBitmap(src, 0, 0, width, height, m, filter); 438 439 synchronized (Bitmap.class) { 440 // do we need to check for null? why not just assign everytime? 441 if (sScaleMatrix == null) { 442 sScaleMatrix = m; 443 } 444 } 445 446 return b; 447 } 448 449 /** 450 * Returns an immutable bitmap from the source bitmap. The new bitmap may 451 * be the same object as source, or a copy may have been made. It is 452 * initialized with the same density as the original bitmap. 453 */ 454 public static Bitmap createBitmap(Bitmap src) { 455 return createBitmap(src, 0, 0, src.getWidth(), src.getHeight()); 456 } 457 458 /** 459 * Returns an immutable bitmap from the specified subset of the source 460 * bitmap. The new bitmap may be the same object as source, or a copy may 461 * have been made. It is 462 * initialized with the same density as the original bitmap. 463 * 464 * @param source The bitmap we are subsetting 465 * @param x The x coordinate of the first pixel in source 466 * @param y The y coordinate of the first pixel in source 467 * @param width The number of pixels in each row 468 * @param height The number of rows 469 */ 470 public static Bitmap createBitmap(Bitmap source, int x, int y, int width, int height) { 471 return createBitmap(source, x, y, width, height, null, false); 472 } 473 474 /** 475 * Returns an immutable bitmap from subset of the source bitmap, 476 * transformed by the optional matrix. It is 477 * initialized with the same density as the original bitmap. 478 * 479 * @param source The bitmap we are subsetting 480 * @param x The x coordinate of the first pixel in source 481 * @param y The y coordinate of the first pixel in source 482 * @param width The number of pixels in each row 483 * @param height The number of rows 484 * @param m Optional matrix to be applied to the pixels 485 * @param filter true if the source should be filtered. 486 * Only applies if the matrix contains more than just 487 * translation. 488 * @return A bitmap that represents the specified subset of source 489 * @throws IllegalArgumentException if the x, y, width, height values are 490 * outside of the dimensions of the source bitmap. 491 */ 492 public static Bitmap createBitmap(Bitmap source, int x, int y, int width, int height, 493 Matrix m, boolean filter) { 494 495 checkXYSign(x, y); 496 checkWidthHeight(width, height); 497 if (x + width > source.getWidth()) { 498 throw new IllegalArgumentException("x + width must be <= bitmap.width()"); 499 } 500 if (y + height > source.getHeight()) { 501 throw new IllegalArgumentException("y + height must be <= bitmap.height()"); 502 } 503 504 // check if we can just return our argument unchanged 505 if (!source.isMutable() && x == 0 && y == 0 && width == source.getWidth() && 506 height == source.getHeight() && (m == null || m.isIdentity())) { 507 return source; 508 } 509 510 int neww = width; 511 int newh = height; 512 Canvas canvas = new Canvas(); 513 Bitmap bitmap; 514 Paint paint; 515 516 Rect srcR = new Rect(x, y, x + width, y + height); 517 RectF dstR = new RectF(0, 0, width, height); 518 519 Config newConfig = Config.ARGB_8888; 520 final Config config = source.getConfig(); 521 // GIF files generate null configs, assume ARGB_8888 522 if (config != null) { 523 switch (config) { 524 case RGB_565: 525 newConfig = Config.RGB_565; 526 break; 527 case ALPHA_8: 528 newConfig = Config.ALPHA_8; 529 break; 530 //noinspection deprecation 531 case ARGB_4444: 532 case ARGB_8888: 533 default: 534 newConfig = Config.ARGB_8888; 535 break; 536 } 537 } 538 539 if (m == null || m.isIdentity()) { 540 bitmap = createBitmap(neww, newh, newConfig, source.hasAlpha()); 541 paint = null; // not needed 542 } else { 543 final boolean transformed = !m.rectStaysRect(); 544 545 RectF deviceR = new RectF(); 546 m.mapRect(deviceR, dstR); 547 548 neww = Math.round(deviceR.width()); 549 newh = Math.round(deviceR.height()); 550 551 bitmap = createBitmap(neww, newh, transformed ? Config.ARGB_8888 : newConfig, 552 transformed || source.hasAlpha()); 553 554 canvas.translate(-deviceR.left, -deviceR.top); 555 canvas.concat(m); 556 557 paint = new Paint(); 558 paint.setFilterBitmap(filter); 559 if (transformed) { 560 paint.setAntiAlias(true); 561 } 562 } 563 564 // The new bitmap was created from a known bitmap source so assume that 565 // they use the same density 566 bitmap.mDensity = source.mDensity; 567 568 canvas.setBitmap(bitmap); 569 canvas.drawBitmap(source, srcR, dstR, paint); 570 canvas.setBitmap(null); 571 572 return bitmap; 573 } 574 575 /** 576 * Returns a mutable bitmap with the specified width and height. Its 577 * initial density is as per {@link #getDensity}. 578 * 579 * @param width The width of the bitmap 580 * @param height The height of the bitmap 581 * @param config The bitmap config to create. 582 * @throws IllegalArgumentException if the width or height are <= 0 583 */ 584 public static Bitmap createBitmap(int width, int height, Config config) { 585 return createBitmap(width, height, config, true); 586 } 587 588 /** 589 * Returns a mutable bitmap with the specified width and height. Its 590 * initial density is as per {@link #getDensity}. 591 * 592 * @param width The width of the bitmap 593 * @param height The height of the bitmap 594 * @param config The bitmap config to create. 595 * @param hasAlpha If the bitmap is ARGB_8888 this flag can be used to mark the 596 * bitmap as opaque. Doing so will clear the bitmap in black 597 * instead of transparent. 598 * 599 * @throws IllegalArgumentException if the width or height are <= 0 600 */ 601 private static Bitmap createBitmap(int width, int height, Config config, boolean hasAlpha) { 602 if (width <= 0 || height <= 0) { 603 throw new IllegalArgumentException("width and height must be > 0"); 604 } 605 Bitmap bm = nativeCreate(null, 0, width, width, height, config.nativeInt, true); 606 if (config == Config.ARGB_8888 && !hasAlpha) { 607 bm.eraseColor(0xff000000); 608 nativeSetHasAlpha(bm.mNativeBitmap, hasAlpha); 609 } else { 610 bm.eraseColor(0); 611 } 612 return bm; 613 } 614 615 /** 616 * Returns a immutable bitmap with the specified width and height, with each 617 * pixel value set to the corresponding value in the colors array. Its 618 * initial density is as per {@link #getDensity}. 619 * 620 * @param colors Array of {@link Color} used to initialize the pixels. 621 * @param offset Number of values to skip before the first color in the 622 * array of colors. 623 * @param stride Number of colors in the array between rows (must be >= 624 * width or <= -width). 625 * @param width The width of the bitmap 626 * @param height The height of the bitmap 627 * @param config The bitmap config to create. If the config does not 628 * support per-pixel alpha (e.g. RGB_565), then the alpha 629 * bytes in the colors[] will be ignored (assumed to be FF) 630 * @throws IllegalArgumentException if the width or height are <= 0, or if 631 * the color array's length is less than the number of pixels. 632 */ 633 public static Bitmap createBitmap(int colors[], int offset, int stride, 634 int width, int height, Config config) { 635 636 checkWidthHeight(width, height); 637 if (Math.abs(stride) < width) { 638 throw new IllegalArgumentException("abs(stride) must be >= width"); 639 } 640 int lastScanline = offset + (height - 1) * stride; 641 int length = colors.length; 642 if (offset < 0 || (offset + width > length) || lastScanline < 0 || 643 (lastScanline + width > length)) { 644 throw new ArrayIndexOutOfBoundsException(); 645 } 646 if (width <= 0 || height <= 0) { 647 throw new IllegalArgumentException("width and height must be > 0"); 648 } 649 return nativeCreate(colors, offset, stride, width, height, 650 config.nativeInt, false); 651 } 652 653 /** 654 * Returns a immutable bitmap with the specified width and height, with each 655 * pixel value set to the corresponding value in the colors array. Its 656 * initial density is as per {@link #getDensity}. 657 * 658 * @param colors Array of {@link Color} used to initialize the pixels. 659 * This array must be at least as large as width * height. 660 * @param width The width of the bitmap 661 * @param height The height of the bitmap 662 * @param config The bitmap config to create. If the config does not 663 * support per-pixel alpha (e.g. RGB_565), then the alpha 664 * bytes in the colors[] will be ignored (assumed to be FF) 665 * @throws IllegalArgumentException if the width or height are <= 0, or if 666 * the color array's length is less than the number of pixels. 667 */ 668 public static Bitmap createBitmap(int colors[], int width, int height, Config config) { 669 return createBitmap(colors, 0, width, width, height, config); 670 } 671 672 /** 673 * Returns an optional array of private data, used by the UI system for 674 * some bitmaps. Not intended to be called by applications. 675 */ 676 public byte[] getNinePatchChunk() { 677 return mNinePatchChunk; 678 } 679 680 /** 681 * Specifies the known formats a bitmap can be compressed into 682 */ 683 public enum CompressFormat { 684 JPEG (0), 685 PNG (1), 686 WEBP (2); 687 688 CompressFormat(int nativeInt) { 689 this.nativeInt = nativeInt; 690 } 691 final int nativeInt; 692 } 693 694 /** 695 * Number of bytes of temp storage we use for communicating between the 696 * native compressor and the java OutputStream. 697 */ 698 private final static int WORKING_COMPRESS_STORAGE = 4096; 699 700 /** 701 * Write a compressed version of the bitmap to the specified outputstream. 702 * If this returns true, the bitmap can be reconstructed by passing a 703 * corresponding inputstream to BitmapFactory.decodeStream(). Note: not 704 * all Formats support all bitmap configs directly, so it is possible that 705 * the returned bitmap from BitmapFactory could be in a different bitdepth, 706 * and/or may have lost per-pixel alpha (e.g. JPEG only supports opaque 707 * pixels). 708 * 709 * @param format The format of the compressed image 710 * @param quality Hint to the compressor, 0-100. 0 meaning compress for 711 * small size, 100 meaning compress for max quality. Some 712 * formats, like PNG which is lossless, will ignore the 713 * quality setting 714 * @param stream The outputstream to write the compressed data. 715 * @return true if successfully compressed to the specified stream. 716 */ 717 public boolean compress(CompressFormat format, int quality, OutputStream stream) { 718 checkRecycled("Can't compress a recycled bitmap"); 719 // do explicit check before calling the native method 720 if (stream == null) { 721 throw new NullPointerException(); 722 } 723 if (quality < 0 || quality > 100) { 724 throw new IllegalArgumentException("quality must be 0..100"); 725 } 726 return nativeCompress(mNativeBitmap, format.nativeInt, quality, 727 stream, new byte[WORKING_COMPRESS_STORAGE]); 728 } 729 730 /** 731 * Returns true if the bitmap is marked as mutable (i.e. can be drawn into) 732 */ 733 public final boolean isMutable() { 734 return mIsMutable; 735 } 736 737 /** Returns the bitmap's width */ 738 public final int getWidth() { 739 return mWidth == -1 ? mWidth = nativeWidth(mNativeBitmap) : mWidth; 740 } 741 742 /** Returns the bitmap's height */ 743 public final int getHeight() { 744 return mHeight == -1 ? mHeight = nativeHeight(mNativeBitmap) : mHeight; 745 } 746 747 /** 748 * Convenience for calling {@link #getScaledWidth(int)} with the target 749 * density of the given {@link Canvas}. 750 */ 751 public int getScaledWidth(Canvas canvas) { 752 return scaleFromDensity(getWidth(), mDensity, canvas.mDensity); 753 } 754 755 /** 756 * Convenience for calling {@link #getScaledHeight(int)} with the target 757 * density of the given {@link Canvas}. 758 */ 759 public int getScaledHeight(Canvas canvas) { 760 return scaleFromDensity(getHeight(), mDensity, canvas.mDensity); 761 } 762 763 /** 764 * Convenience for calling {@link #getScaledWidth(int)} with the target 765 * density of the given {@link DisplayMetrics}. 766 */ 767 public int getScaledWidth(DisplayMetrics metrics) { 768 return scaleFromDensity(getWidth(), mDensity, metrics.densityDpi); 769 } 770 771 /** 772 * Convenience for calling {@link #getScaledHeight(int)} with the target 773 * density of the given {@link DisplayMetrics}. 774 */ 775 public int getScaledHeight(DisplayMetrics metrics) { 776 return scaleFromDensity(getHeight(), mDensity, metrics.densityDpi); 777 } 778 779 /** 780 * Convenience method that returns the width of this bitmap divided 781 * by the density scale factor. 782 * 783 * @param targetDensity The density of the target canvas of the bitmap. 784 * @return The scaled width of this bitmap, according to the density scale factor. 785 */ 786 public int getScaledWidth(int targetDensity) { 787 return scaleFromDensity(getWidth(), mDensity, targetDensity); 788 } 789 790 /** 791 * Convenience method that returns the height of this bitmap divided 792 * by the density scale factor. 793 * 794 * @param targetDensity The density of the target canvas of the bitmap. 795 * @return The scaled height of this bitmap, according to the density scale factor. 796 */ 797 public int getScaledHeight(int targetDensity) { 798 return scaleFromDensity(getHeight(), mDensity, targetDensity); 799 } 800 801 /** 802 * @hide 803 */ 804 static public int scaleFromDensity(int size, int sdensity, int tdensity) { 805 if (sdensity == DENSITY_NONE || sdensity == tdensity) { 806 return size; 807 } 808 809 // Scale by tdensity / sdensity, rounding up. 810 return ((size * tdensity) + (sdensity >> 1)) / sdensity; 811 } 812 813 /** 814 * Return the number of bytes between rows in the bitmap's pixels. Note that 815 * this refers to the pixels as stored natively by the bitmap. If you call 816 * getPixels() or setPixels(), then the pixels are uniformly treated as 817 * 32bit values, packed according to the Color class. 818 * 819 * @return number of bytes between rows of the native bitmap pixels. 820 */ 821 public final int getRowBytes() { 822 return nativeRowBytes(mNativeBitmap); 823 } 824 825 /** 826 * Returns the number of bytes used to store this bitmap's pixels. 827 */ 828 public final int getByteCount() { 829 // int result permits bitmaps up to 46,340 x 46,340 830 return getRowBytes() * getHeight(); 831 } 832 833 /** 834 * If the bitmap's internal config is in one of the public formats, return 835 * that config, otherwise return null. 836 */ 837 public final Config getConfig() { 838 return Config.nativeToConfig(nativeConfig(mNativeBitmap)); 839 } 840 841 /** Returns true if the bitmap's config supports per-pixel alpha, and 842 * if the pixels may contain non-opaque alpha values. For some configs, 843 * this is always false (e.g. RGB_565), since they do not support per-pixel 844 * alpha. However, for configs that do, the bitmap may be flagged to be 845 * known that all of its pixels are opaque. In this case hasAlpha() will 846 * also return false. If a config such as ARGB_8888 is not so flagged, 847 * it will return true by default. 848 */ 849 public final boolean hasAlpha() { 850 return nativeHasAlpha(mNativeBitmap); 851 } 852 853 /** 854 * Tell the bitmap if all of the pixels are known to be opaque (false) 855 * or if some of the pixels may contain non-opaque alpha values (true). 856 * Note, for some configs (e.g. RGB_565) this call is ignored, since it 857 * does not support per-pixel alpha values. 858 * 859 * This is meant as a drawing hint, as in some cases a bitmap that is known 860 * to be opaque can take a faster drawing case than one that may have 861 * non-opaque per-pixel alpha values. 862 */ 863 public void setHasAlpha(boolean hasAlpha) { 864 nativeSetHasAlpha(mNativeBitmap, hasAlpha); 865 } 866 867 /** 868 * Fills the bitmap's pixels with the specified {@link Color}. 869 * 870 * @throws IllegalStateException if the bitmap is not mutable. 871 */ 872 public void eraseColor(int c) { 873 checkRecycled("Can't erase a recycled bitmap"); 874 if (!isMutable()) { 875 throw new IllegalStateException("cannot erase immutable bitmaps"); 876 } 877 nativeErase(mNativeBitmap, c); 878 } 879 880 /** 881 * Returns the {@link Color} at the specified location. Throws an exception 882 * if x or y are out of bounds (negative or >= to the width or height 883 * respectively). 884 * 885 * @param x The x coordinate (0...width-1) of the pixel to return 886 * @param y The y coordinate (0...height-1) of the pixel to return 887 * @return The argb {@link Color} at the specified coordinate 888 * @throws IllegalArgumentException if x, y exceed the bitmap's bounds 889 */ 890 public int getPixel(int x, int y) { 891 checkRecycled("Can't call getPixel() on a recycled bitmap"); 892 checkPixelAccess(x, y); 893 return nativeGetPixel(mNativeBitmap, x, y); 894 } 895 896 /** 897 * Returns in pixels[] a copy of the data in the bitmap. Each value is 898 * a packed int representing a {@link Color}. The stride parameter allows 899 * the caller to allow for gaps in the returned pixels array between 900 * rows. For normal packed results, just pass width for the stride value. 901 * 902 * @param pixels The array to receive the bitmap's colors 903 * @param offset The first index to write into pixels[] 904 * @param stride The number of entries in pixels[] to skip between 905 * rows (must be >= bitmap's width). Can be negative. 906 * @param x The x coordinate of the first pixel to read from 907 * the bitmap 908 * @param y The y coordinate of the first pixel to read from 909 * the bitmap 910 * @param width The number of pixels to read from each row 911 * @param height The number of rows to read 912 * @throws IllegalArgumentException if x, y, width, height exceed the 913 * bounds of the bitmap, or if abs(stride) < width. 914 * @throws ArrayIndexOutOfBoundsException if the pixels array is too small 915 * to receive the specified number of pixels. 916 */ 917 public void getPixels(int[] pixels, int offset, int stride, 918 int x, int y, int width, int height) { 919 checkRecycled("Can't call getPixels() on a recycled bitmap"); 920 if (width == 0 || height == 0) { 921 return; // nothing to do 922 } 923 checkPixelsAccess(x, y, width, height, offset, stride, pixels); 924 nativeGetPixels(mNativeBitmap, pixels, offset, stride, 925 x, y, width, height); 926 } 927 928 /** 929 * Shared code to check for illegal arguments passed to getPixel() 930 * or setPixel() 931 * @param x x coordinate of the pixel 932 * @param y y coordinate of the pixel 933 */ 934 private void checkPixelAccess(int x, int y) { 935 checkXYSign(x, y); 936 if (x >= getWidth()) { 937 throw new IllegalArgumentException("x must be < bitmap.width()"); 938 } 939 if (y >= getHeight()) { 940 throw new IllegalArgumentException("y must be < bitmap.height()"); 941 } 942 } 943 944 /** 945 * Shared code to check for illegal arguments passed to getPixels() 946 * or setPixels() 947 * 948 * @param x left edge of the area of pixels to access 949 * @param y top edge of the area of pixels to access 950 * @param width width of the area of pixels to access 951 * @param height height of the area of pixels to access 952 * @param offset offset into pixels[] array 953 * @param stride number of elements in pixels[] between each logical row 954 * @param pixels array to hold the area of pixels being accessed 955 */ 956 private void checkPixelsAccess(int x, int y, int width, int height, 957 int offset, int stride, int pixels[]) { 958 checkXYSign(x, y); 959 if (width < 0) { 960 throw new IllegalArgumentException("width must be >= 0"); 961 } 962 if (height < 0) { 963 throw new IllegalArgumentException("height must be >= 0"); 964 } 965 if (x + width > getWidth()) { 966 throw new IllegalArgumentException( 967 "x + width must be <= bitmap.width()"); 968 } 969 if (y + height > getHeight()) { 970 throw new IllegalArgumentException( 971 "y + height must be <= bitmap.height()"); 972 } 973 if (Math.abs(stride) < width) { 974 throw new IllegalArgumentException("abs(stride) must be >= width"); 975 } 976 int lastScanline = offset + (height - 1) * stride; 977 int length = pixels.length; 978 if (offset < 0 || (offset + width > length) 979 || lastScanline < 0 980 || (lastScanline + width > length)) { 981 throw new ArrayIndexOutOfBoundsException(); 982 } 983 } 984 985 /** 986 * Write the specified {@link Color} into the bitmap (assuming it is 987 * mutable) at the x,y coordinate. 988 * 989 * @param x The x coordinate of the pixel to replace (0...width-1) 990 * @param y The y coordinate of the pixel to replace (0...height-1) 991 * @param color The {@link Color} to write into the bitmap 992 * @throws IllegalStateException if the bitmap is not mutable 993 * @throws IllegalArgumentException if x, y are outside of the bitmap's 994 * bounds. 995 */ 996 public void setPixel(int x, int y, int color) { 997 checkRecycled("Can't call setPixel() on a recycled bitmap"); 998 if (!isMutable()) { 999 throw new IllegalStateException(); 1000 } 1001 checkPixelAccess(x, y); 1002 nativeSetPixel(mNativeBitmap, x, y, color); 1003 } 1004 1005 /** 1006 * Replace pixels in the bitmap with the colors in the array. Each element 1007 * in the array is a packed int prepresenting a {@link Color} 1008 * 1009 * @param pixels The colors to write to the bitmap 1010 * @param offset The index of the first color to read from pixels[] 1011 * @param stride The number of colors in pixels[] to skip between rows. 1012 * Normally this value will be the same as the width of 1013 * the bitmap, but it can be larger (or negative). 1014 * @param x The x coordinate of the first pixel to write to in 1015 * the bitmap. 1016 * @param y The y coordinate of the first pixel to write to in 1017 * the bitmap. 1018 * @param width The number of colors to copy from pixels[] per row 1019 * @param height The number of rows to write to the bitmap 1020 * @throws IllegalStateException if the bitmap is not mutable 1021 * @throws IllegalArgumentException if x, y, width, height are outside of 1022 * the bitmap's bounds. 1023 * @throws ArrayIndexOutOfBoundsException if the pixels array is too small 1024 * to receive the specified number of pixels. 1025 */ 1026 public void setPixels(int[] pixels, int offset, int stride, 1027 int x, int y, int width, int height) { 1028 checkRecycled("Can't call setPixels() on a recycled bitmap"); 1029 if (!isMutable()) { 1030 throw new IllegalStateException(); 1031 } 1032 if (width == 0 || height == 0) { 1033 return; // nothing to do 1034 } 1035 checkPixelsAccess(x, y, width, height, offset, stride, pixels); 1036 nativeSetPixels(mNativeBitmap, pixels, offset, stride, 1037 x, y, width, height); 1038 } 1039 1040 public static final Parcelable.Creator<Bitmap> CREATOR 1041 = new Parcelable.Creator<Bitmap>() { 1042 /** 1043 * Rebuilds a bitmap previously stored with writeToParcel(). 1044 * 1045 * @param p Parcel object to read the bitmap from 1046 * @return a new bitmap created from the data in the parcel 1047 */ 1048 public Bitmap createFromParcel(Parcel p) { 1049 Bitmap bm = nativeCreateFromParcel(p); 1050 if (bm == null) { 1051 throw new RuntimeException("Failed to unparcel Bitmap"); 1052 } 1053 return bm; 1054 } 1055 public Bitmap[] newArray(int size) { 1056 return new Bitmap[size]; 1057 } 1058 }; 1059 1060 /** 1061 * No special parcel contents. 1062 */ 1063 public int describeContents() { 1064 return 0; 1065 } 1066 1067 /** 1068 * Write the bitmap and its pixels to the parcel. The bitmap can be 1069 * rebuilt from the parcel by calling CREATOR.createFromParcel(). 1070 * @param p Parcel object to write the bitmap data into 1071 */ 1072 public void writeToParcel(Parcel p, int flags) { 1073 checkRecycled("Can't parcel a recycled bitmap"); 1074 if (!nativeWriteToParcel(mNativeBitmap, mIsMutable, mDensity, p)) { 1075 throw new RuntimeException("native writeToParcel failed"); 1076 } 1077 } 1078 1079 /** 1080 * Returns a new bitmap that captures the alpha values of the original. 1081 * This may be drawn with Canvas.drawBitmap(), where the color(s) will be 1082 * taken from the paint that is passed to the draw call. 1083 * 1084 * @return new bitmap containing the alpha channel of the original bitmap. 1085 */ 1086 public Bitmap extractAlpha() { 1087 return extractAlpha(null, null); 1088 } 1089 1090 /** 1091 * Returns a new bitmap that captures the alpha values of the original. 1092 * These values may be affected by the optional Paint parameter, which 1093 * can contain its own alpha, and may also contain a MaskFilter which 1094 * could change the actual dimensions of the resulting bitmap (e.g. 1095 * a blur maskfilter might enlarge the resulting bitmap). If offsetXY 1096 * is not null, it returns the amount to offset the returned bitmap so 1097 * that it will logically align with the original. For example, if the 1098 * paint contains a blur of radius 2, then offsetXY[] would contains 1099 * -2, -2, so that drawing the alpha bitmap offset by (-2, -2) and then 1100 * drawing the original would result in the blur visually aligning with 1101 * the original. 1102 * 1103 * <p>The initial density of the returned bitmap is the same as the original's. 1104 * 1105 * @param paint Optional paint used to modify the alpha values in the 1106 * resulting bitmap. Pass null for default behavior. 1107 * @param offsetXY Optional array that returns the X (index 0) and Y 1108 * (index 1) offset needed to position the returned bitmap 1109 * so that it visually lines up with the original. 1110 * @return new bitmap containing the (optionally modified by paint) alpha 1111 * channel of the original bitmap. This may be drawn with 1112 * Canvas.drawBitmap(), where the color(s) will be taken from the 1113 * paint that is passed to the draw call. 1114 */ 1115 public Bitmap extractAlpha(Paint paint, int[] offsetXY) { 1116 checkRecycled("Can't extractAlpha on a recycled bitmap"); 1117 int nativePaint = paint != null ? paint.mNativePaint : 0; 1118 Bitmap bm = nativeExtractAlpha(mNativeBitmap, nativePaint, offsetXY); 1119 if (bm == null) { 1120 throw new RuntimeException("Failed to extractAlpha on Bitmap"); 1121 } 1122 bm.mDensity = mDensity; 1123 return bm; 1124 } 1125 1126 /** 1127 * Given another bitmap, return true if it has the same dimensions, config, 1128 * and pixel data as this bitmap. If any of those differ, return false. 1129 * If other is null, return false. 1130 */ 1131 public boolean sameAs(Bitmap other) { 1132 return this == other || (other != null && nativeSameAs(mNativeBitmap, other.mNativeBitmap)); 1133 } 1134 1135 /** 1136 * Rebuilds any caches associated with the bitmap that are used for 1137 * drawing it. In the case of purgeable bitmaps, this call will attempt to 1138 * ensure that the pixels have been decoded. 1139 * If this is called on more than one bitmap in sequence, the priority is 1140 * given in LRU order (i.e. the last bitmap called will be given highest 1141 * priority). 1142 * 1143 * For bitmaps with no associated caches, this call is effectively a no-op, 1144 * and therefore is harmless. 1145 */ 1146 public void prepareToDraw() { 1147 nativePrepareToDraw(mNativeBitmap); 1148 } 1149 1150 private static class BitmapFinalizer { 1151 private final int mNativeBitmap; 1152 1153 BitmapFinalizer(int nativeBitmap) { 1154 mNativeBitmap = nativeBitmap; 1155 } 1156 1157 @Override 1158 public void finalize() { 1159 try { 1160 super.finalize(); 1161 } catch (Throwable t) { 1162 // Ignore 1163 } finally { 1164 nativeDestructor(mNativeBitmap); 1165 } 1166 } 1167 } 1168 1169 //////////// native methods 1170 1171 private static native Bitmap nativeCreate(int[] colors, int offset, 1172 int stride, int width, int height, 1173 int nativeConfig, boolean mutable); 1174 private static native Bitmap nativeCopy(int srcBitmap, int nativeConfig, 1175 boolean isMutable); 1176 private static native void nativeDestructor(int nativeBitmap); 1177 private static native void nativeRecycle(int nativeBitmap); 1178 1179 private static native boolean nativeCompress(int nativeBitmap, int format, 1180 int quality, OutputStream stream, 1181 byte[] tempStorage); 1182 private static native void nativeErase(int nativeBitmap, int color); 1183 private static native int nativeWidth(int nativeBitmap); 1184 private static native int nativeHeight(int nativeBitmap); 1185 private static native int nativeRowBytes(int nativeBitmap); 1186 private static native int nativeConfig(int nativeBitmap); 1187 private static native boolean nativeHasAlpha(int nativeBitmap); 1188 1189 private static native int nativeGetPixel(int nativeBitmap, int x, int y); 1190 private static native void nativeGetPixels(int nativeBitmap, int[] pixels, 1191 int offset, int stride, int x, 1192 int y, int width, int height); 1193 1194 private static native void nativeSetPixel(int nativeBitmap, int x, int y, 1195 int color); 1196 private static native void nativeSetPixels(int nativeBitmap, int[] colors, 1197 int offset, int stride, int x, 1198 int y, int width, int height); 1199 private static native void nativeCopyPixelsToBuffer(int nativeBitmap, 1200 Buffer dst); 1201 private static native void nativeCopyPixelsFromBuffer(int nb, Buffer src); 1202 private static native int nativeGenerationId(int nativeBitmap); 1203 1204 private static native Bitmap nativeCreateFromParcel(Parcel p); 1205 // returns true on success 1206 private static native boolean nativeWriteToParcel(int nativeBitmap, 1207 boolean isMutable, 1208 int density, 1209 Parcel p); 1210 // returns a new bitmap built from the native bitmap's alpha, and the paint 1211 private static native Bitmap nativeExtractAlpha(int nativeBitmap, 1212 int nativePaint, 1213 int[] offsetXY); 1214 1215 private static native void nativePrepareToDraw(int nativeBitmap); 1216 private static native void nativeSetHasAlpha(int nBitmap, boolean hasAlpha); 1217 private static native boolean nativeSameAs(int nb0, int nb1); 1218 1219 /* package */ final int ni() { 1220 return mNativeBitmap; 1221 } 1222 } 1223
