Canvas.java revision 95d49149cc7fff87a18449fa661454c1b5ddbd30
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 17package android.graphics; 18 19import android.text.GraphicsOperations; 20import android.text.SpannableString; 21import android.text.SpannedString; 22import android.text.TextUtils; 23 24import javax.microedition.khronos.opengles.GL; 25 26/** 27 * The Canvas class holds the "draw" calls. To draw something, you need 28 * 4 basic components: A Bitmap to hold the pixels, a Canvas to host 29 * the draw calls (writing into the bitmap), a drawing primitive (e.g. Rect, 30 * Path, text, Bitmap), and a paint (to describe the colors and styles for the 31 * drawing). 32 * 33 * <div class="special reference"> 34 * <h3>Developer Guides</h3> 35 * <p>For more information about how to use Canvas, read the 36 * <a href="{@docRoot}guide/topics/graphics/2d-graphics.html"> 37 * Canvas and Drawables</a> developer guide.</p></div> 38 */ 39public class Canvas { 40 41 // assigned in constructors or setBitmap, freed in finalizer 42 private long mNativeCanvasWrapper; 43 44 /** @hide */ 45 public long getNativeCanvasWrapper() { 46 return mNativeCanvasWrapper; 47 } 48 49 // may be null 50 private Bitmap mBitmap; 51 52 // optional field set by the caller 53 private DrawFilter mDrawFilter; 54 55 /** 56 * @hide 57 */ 58 protected int mDensity = Bitmap.DENSITY_NONE; 59 60 /** 61 * Used to determine when compatibility scaling is in effect. 62 * 63 * @hide 64 */ 65 protected int mScreenDensity = Bitmap.DENSITY_NONE; 66 67 // Used by native code 68 @SuppressWarnings("UnusedDeclaration") 69 private int mSurfaceFormat; 70 71 /** 72 * Flag for drawTextRun indicating left-to-right run direction. 73 * @hide 74 */ 75 public static final int DIRECTION_LTR = 0; 76 77 /** 78 * Flag for drawTextRun indicating right-to-left run direction. 79 * @hide 80 */ 81 public static final int DIRECTION_RTL = 1; 82 83 // Maximum bitmap size as defined in Skia's native code 84 // (see SkCanvas.cpp, SkDraw.cpp) 85 private static final int MAXMIMUM_BITMAP_SIZE = 32766; 86 87 // This field is used to finalize the native Canvas properly 88 private final CanvasFinalizer mFinalizer; 89 90 private static final class CanvasFinalizer { 91 private long mNativeCanvasWrapper; 92 93 public CanvasFinalizer(long nativeCanvas) { 94 mNativeCanvasWrapper = nativeCanvas; 95 } 96 97 @Override 98 protected void finalize() throws Throwable { 99 try { 100 dispose(); 101 } finally { 102 super.finalize(); 103 } 104 } 105 106 public void dispose() { 107 if (mNativeCanvasWrapper != 0) { 108 finalizer(mNativeCanvasWrapper); 109 mNativeCanvasWrapper = 0; 110 } 111 } 112 } 113 114 /** 115 * Construct an empty raster canvas. Use setBitmap() to specify a bitmap to 116 * draw into. The initial target density is {@link Bitmap#DENSITY_NONE}; 117 * this will typically be replaced when a target bitmap is set for the 118 * canvas. 119 */ 120 public Canvas() { 121 if (!isHardwareAccelerated()) { 122 // 0 means no native bitmap 123 mNativeCanvasWrapper = initRaster(0); 124 mFinalizer = new CanvasFinalizer(mNativeCanvasWrapper); 125 } else { 126 mFinalizer = null; 127 } 128 } 129 130 /** 131 * Construct a canvas with the specified bitmap to draw into. The bitmap 132 * must be mutable. 133 * 134 * <p>The initial target density of the canvas is the same as the given 135 * bitmap's density. 136 * 137 * @param bitmap Specifies a mutable bitmap for the canvas to draw into. 138 */ 139 public Canvas(Bitmap bitmap) { 140 if (!bitmap.isMutable()) { 141 throw new IllegalStateException("Immutable bitmap passed to Canvas constructor"); 142 } 143 throwIfCannotDraw(bitmap); 144 mNativeCanvasWrapper = initRaster(bitmap.ni()); 145 mFinalizer = new CanvasFinalizer(mNativeCanvasWrapper); 146 mBitmap = bitmap; 147 mDensity = bitmap.mDensity; 148 } 149 150 /** @hide */ 151 public Canvas(long nativeCanvas) { 152 if (nativeCanvas == 0) { 153 throw new IllegalStateException(); 154 } 155 mNativeCanvasWrapper = initCanvas(nativeCanvas); 156 mFinalizer = new CanvasFinalizer(mNativeCanvasWrapper); 157 mDensity = Bitmap.getDefaultDensity(); 158 } 159 160 /** 161 * Returns null. 162 * 163 * @deprecated This method is not supported and should not be invoked. 164 * 165 * @hide 166 */ 167 @Deprecated 168 protected GL getGL() { 169 return null; 170 } 171 172 /** 173 * Indicates whether this Canvas uses hardware acceleration. 174 * 175 * Note that this method does not define what type of hardware acceleration 176 * may or may not be used. 177 * 178 * @return True if drawing operations are hardware accelerated, 179 * false otherwise. 180 */ 181 public boolean isHardwareAccelerated() { 182 return false; 183 } 184 185 /** 186 * Specify a bitmap for the canvas to draw into. All canvas state such as 187 * layers, filters, and the save/restore stack are reset with the exception 188 * of the current matrix and clip stack. Additionally, as a side-effect 189 * the canvas' target density is updated to match that of the bitmap. 190 * 191 * @param bitmap Specifies a mutable bitmap for the canvas to draw into. 192 * @see #setDensity(int) 193 * @see #getDensity() 194 */ 195 public void setBitmap(Bitmap bitmap) { 196 if (isHardwareAccelerated()) { 197 throw new RuntimeException("Can't set a bitmap device on a GL canvas"); 198 } 199 200 if (bitmap == null) { 201 native_setBitmap(mNativeCanvasWrapper, 0, false); 202 mDensity = Bitmap.DENSITY_NONE; 203 } else { 204 if (!bitmap.isMutable()) { 205 throw new IllegalStateException(); 206 } 207 throwIfCannotDraw(bitmap); 208 209 native_setBitmap(mNativeCanvasWrapper, bitmap.ni(), true); 210 mDensity = bitmap.mDensity; 211 } 212 213 mBitmap = bitmap; 214 } 215 216 /** 217 * setBitmap() variant for native callers with a raw bitmap handle. 218 */ 219 private void setNativeBitmap(long bitmapHandle) { 220 native_setBitmap(mNativeCanvasWrapper, bitmapHandle, false); 221 } 222 223 /** 224 * Set the viewport dimensions if this canvas is GL based. If it is not, 225 * this method is ignored and no exception is thrown. 226 * 227 * @param width The width of the viewport 228 * @param height The height of the viewport 229 * 230 * @hide 231 */ 232 public void setViewport(int width, int height) {} 233 234 /** 235 * @hide 236 */ 237 public void initializeLight(float lightX, float lightY, float lightZ, float lightRadius) {} 238 239 /** 240 * Return true if the device that the current layer draws into is opaque 241 * (i.e. does not support per-pixel alpha). 242 * 243 * @return true if the device that the current layer draws into is opaque 244 */ 245 public boolean isOpaque() { 246 return native_isOpaque(mNativeCanvasWrapper); 247 } 248 249 /** 250 * Returns the width of the current drawing layer 251 * 252 * @return the width of the current drawing layer 253 */ 254 public int getWidth() { 255 return native_getWidth(mNativeCanvasWrapper); 256 } 257 258 /** 259 * Returns the height of the current drawing layer 260 * 261 * @return the height of the current drawing layer 262 */ 263 public int getHeight() { 264 return native_getHeight(mNativeCanvasWrapper); 265 } 266 267 /** 268 * <p>Returns the target density of the canvas. The default density is 269 * derived from the density of its backing bitmap, or 270 * {@link Bitmap#DENSITY_NONE} if there is not one.</p> 271 * 272 * @return Returns the current target density of the canvas, which is used 273 * to determine the scaling factor when drawing a bitmap into it. 274 * 275 * @see #setDensity(int) 276 * @see Bitmap#getDensity() 277 */ 278 public int getDensity() { 279 return mDensity; 280 } 281 282 /** 283 * <p>Specifies the density for this Canvas' backing bitmap. This modifies 284 * the target density of the canvas itself, as well as the density of its 285 * backing bitmap via {@link Bitmap#setDensity(int) Bitmap.setDensity(int)}. 286 * 287 * @param density The new target density of the canvas, which is used 288 * to determine the scaling factor when drawing a bitmap into it. Use 289 * {@link Bitmap#DENSITY_NONE} to disable bitmap scaling. 290 * 291 * @see #getDensity() 292 * @see Bitmap#setDensity(int) 293 */ 294 public void setDensity(int density) { 295 if (mBitmap != null) { 296 mBitmap.setDensity(density); 297 } 298 mDensity = density; 299 } 300 301 /** @hide */ 302 public void setScreenDensity(int density) { 303 mScreenDensity = density; 304 } 305 306 /** 307 * Returns the maximum allowed width for bitmaps drawn with this canvas. 308 * Attempting to draw with a bitmap wider than this value will result 309 * in an error. 310 * 311 * @see #getMaximumBitmapHeight() 312 */ 313 public int getMaximumBitmapWidth() { 314 return MAXMIMUM_BITMAP_SIZE; 315 } 316 317 /** 318 * Returns the maximum allowed height for bitmaps drawn with this canvas. 319 * Attempting to draw with a bitmap taller than this value will result 320 * in an error. 321 * 322 * @see #getMaximumBitmapWidth() 323 */ 324 public int getMaximumBitmapHeight() { 325 return MAXMIMUM_BITMAP_SIZE; 326 } 327 328 // the SAVE_FLAG constants must match their native equivalents 329 330 /** restore the current matrix when restore() is called */ 331 public static final int MATRIX_SAVE_FLAG = 0x01; 332 /** restore the current clip when restore() is called */ 333 public static final int CLIP_SAVE_FLAG = 0x02; 334 /** the layer needs to per-pixel alpha */ 335 public static final int HAS_ALPHA_LAYER_SAVE_FLAG = 0x04; 336 /** the layer needs to 8-bits per color component */ 337 public static final int FULL_COLOR_LAYER_SAVE_FLAG = 0x08; 338 /** clip against the layer's bounds */ 339 public static final int CLIP_TO_LAYER_SAVE_FLAG = 0x10; 340 /** restore everything when restore() is called */ 341 public static final int ALL_SAVE_FLAG = 0x1F; 342 343 /** 344 * Saves the current matrix and clip onto a private stack. Subsequent 345 * calls to translate,scale,rotate,skew,concat or clipRect,clipPath 346 * will all operate as usual, but when the balancing call to restore() 347 * is made, those calls will be forgotten, and the settings that existed 348 * before the save() will be reinstated. 349 * 350 * @return The value to pass to restoreToCount() to balance this save() 351 */ 352 public int save() { 353 return native_save(mNativeCanvasWrapper, MATRIX_SAVE_FLAG | CLIP_SAVE_FLAG); 354 } 355 356 /** 357 * Based on saveFlags, can save the current matrix and clip onto a private 358 * stack. Subsequent calls to translate,scale,rotate,skew,concat or 359 * clipRect,clipPath will all operate as usual, but when the balancing 360 * call to restore() is made, those calls will be forgotten, and the 361 * settings that existed before the save() will be reinstated. 362 * 363 * @param saveFlags flag bits that specify which parts of the Canvas state 364 * to save/restore 365 * @return The value to pass to restoreToCount() to balance this save() 366 */ 367 public int save(int saveFlags) { 368 return native_save(mNativeCanvasWrapper, saveFlags); 369 } 370 371 /** 372 * This behaves the same as save(), but in addition it allocates an 373 * offscreen bitmap. All drawing calls are directed there, and only when 374 * the balancing call to restore() is made is that offscreen transfered to 375 * the canvas (or the previous layer). Subsequent calls to translate, 376 * scale, rotate, skew, concat or clipRect, clipPath all operate on this 377 * copy. When the balancing call to restore() is made, this copy is 378 * deleted and the previous matrix/clip state is restored. 379 * 380 * @param bounds May be null. The maximum size the offscreen bitmap 381 * needs to be (in local coordinates) 382 * @param paint This is copied, and is applied to the offscreen when 383 * restore() is called. 384 * @param saveFlags see _SAVE_FLAG constants 385 * @return value to pass to restoreToCount() to balance this save() 386 */ 387 public int saveLayer(RectF bounds, Paint paint, int saveFlags) { 388 return native_saveLayer(mNativeCanvasWrapper, 389 bounds.left, bounds.top, bounds.right, bounds.bottom, 390 paint != null ? paint.mNativePaint : 0, 391 saveFlags); 392 } 393 394 /** 395 * Convenience for saveLayer(bounds, paint, {@link #ALL_SAVE_FLAG}) 396 */ 397 public int saveLayer(RectF bounds, Paint paint) { 398 return saveLayer(bounds, paint, ALL_SAVE_FLAG); 399 } 400 401 /** 402 * Helper version of saveLayer() that takes 4 values rather than a RectF. 403 */ 404 public int saveLayer(float left, float top, float right, float bottom, Paint paint, 405 int saveFlags) { 406 return native_saveLayer(mNativeCanvasWrapper, left, top, right, bottom, 407 paint != null ? paint.mNativePaint : 0, 408 saveFlags); 409 } 410 411 /** 412 * Convenience for saveLayer(left, top, right, bottom, paint, {@link #ALL_SAVE_FLAG}) 413 */ 414 public int saveLayer(float left, float top, float right, float bottom, Paint paint) { 415 return saveLayer(left, top, right, bottom, paint, ALL_SAVE_FLAG); 416 } 417 418 /** 419 * This behaves the same as save(), but in addition it allocates an 420 * offscreen bitmap. All drawing calls are directed there, and only when 421 * the balancing call to restore() is made is that offscreen transfered to 422 * the canvas (or the previous layer). Subsequent calls to translate, 423 * scale, rotate, skew, concat or clipRect, clipPath all operate on this 424 * copy. When the balancing call to restore() is made, this copy is 425 * deleted and the previous matrix/clip state is restored. 426 * 427 * @param bounds The maximum size the offscreen bitmap needs to be 428 * (in local coordinates) 429 * @param alpha The alpha to apply to the offscreen when when it is 430 drawn during restore() 431 * @param saveFlags see _SAVE_FLAG constants 432 * @return value to pass to restoreToCount() to balance this call 433 */ 434 public int saveLayerAlpha(RectF bounds, int alpha, int saveFlags) { 435 alpha = Math.min(255, Math.max(0, alpha)); 436 return native_saveLayerAlpha(mNativeCanvasWrapper, 437 bounds.left, bounds.top, bounds.right, bounds.bottom, 438 alpha, saveFlags); 439 } 440 441 /** 442 * Convenience for saveLayerAlpha(bounds, alpha, {@link #ALL_SAVE_FLAG}) 443 */ 444 public int saveLayerAlpha(RectF bounds, int alpha) { 445 return saveLayerAlpha(bounds, alpha, ALL_SAVE_FLAG); 446 } 447 448 /** 449 * Helper for saveLayerAlpha() that takes 4 values instead of a RectF. 450 */ 451 public int saveLayerAlpha(float left, float top, float right, float bottom, int alpha, 452 int saveFlags) { 453 return native_saveLayerAlpha(mNativeCanvasWrapper, left, top, right, bottom, 454 alpha, saveFlags); 455 } 456 457 /** 458 * Helper for saveLayerAlpha(left, top, right, bottom, alpha, {@link #ALL_SAVE_FLAG}) 459 */ 460 public int saveLayerAlpha(float left, float top, float right, float bottom, int alpha) { 461 return saveLayerAlpha(left, top, right, bottom, alpha, ALL_SAVE_FLAG); 462 } 463 464 /** 465 * This call balances a previous call to save(), and is used to remove all 466 * modifications to the matrix/clip state since the last save call. It is 467 * an error to call restore() more times than save() was called. 468 */ 469 public void restore() { 470 native_restore(mNativeCanvasWrapper); 471 } 472 473 /** 474 * Returns the number of matrix/clip states on the Canvas' private stack. 475 * This will equal # save() calls - # restore() calls. 476 */ 477 public int getSaveCount() { 478 return native_getSaveCount(mNativeCanvasWrapper); 479 } 480 481 /** 482 * Efficient way to pop any calls to save() that happened after the save 483 * count reached saveCount. It is an error for saveCount to be less than 1. 484 * 485 * Example: 486 * int count = canvas.save(); 487 * ... // more calls potentially to save() 488 * canvas.restoreToCount(count); 489 * // now the canvas is back in the same state it was before the initial 490 * // call to save(). 491 * 492 * @param saveCount The save level to restore to. 493 */ 494 public void restoreToCount(int saveCount) { 495 native_restoreToCount(mNativeCanvasWrapper, saveCount); 496 } 497 498 /** 499 * Preconcat the current matrix with the specified translation 500 * 501 * @param dx The distance to translate in X 502 * @param dy The distance to translate in Y 503 */ 504 public void translate(float dx, float dy) { 505 native_translate(mNativeCanvasWrapper, dx, dy); 506 } 507 508 /** 509 * Preconcat the current matrix with the specified scale. 510 * 511 * @param sx The amount to scale in X 512 * @param sy The amount to scale in Y 513 */ 514 public void scale(float sx, float sy) { 515 native_scale(mNativeCanvasWrapper, sx, sy); 516 } 517 518 /** 519 * Preconcat the current matrix with the specified scale. 520 * 521 * @param sx The amount to scale in X 522 * @param sy The amount to scale in Y 523 * @param px The x-coord for the pivot point (unchanged by the scale) 524 * @param py The y-coord for the pivot point (unchanged by the scale) 525 */ 526 public final void scale(float sx, float sy, float px, float py) { 527 translate(px, py); 528 scale(sx, sy); 529 translate(-px, -py); 530 } 531 532 /** 533 * Preconcat the current matrix with the specified rotation. 534 * 535 * @param degrees The amount to rotate, in degrees 536 */ 537 public void rotate(float degrees) { 538 native_rotate(mNativeCanvasWrapper, degrees); 539 } 540 541 /** 542 * Preconcat the current matrix with the specified rotation. 543 * 544 * @param degrees The amount to rotate, in degrees 545 * @param px The x-coord for the pivot point (unchanged by the rotation) 546 * @param py The y-coord for the pivot point (unchanged by the rotation) 547 */ 548 public final void rotate(float degrees, float px, float py) { 549 translate(px, py); 550 rotate(degrees); 551 translate(-px, -py); 552 } 553 554 /** 555 * Preconcat the current matrix with the specified skew. 556 * 557 * @param sx The amount to skew in X 558 * @param sy The amount to skew in Y 559 */ 560 public void skew(float sx, float sy) { 561 native_skew(mNativeCanvasWrapper, sx, sy); 562 } 563 564 /** 565 * Preconcat the current matrix with the specified matrix. If the specified 566 * matrix is null, this method does nothing. 567 * 568 * @param matrix The matrix to preconcatenate with the current matrix 569 */ 570 public void concat(Matrix matrix) { 571 if (matrix != null) native_concat(mNativeCanvasWrapper, matrix.native_instance); 572 } 573 574 /** 575 * Completely replace the current matrix with the specified matrix. If the 576 * matrix parameter is null, then the current matrix is reset to identity. 577 * 578 * <strong>Note:</strong> it is recommended to use {@link #concat(Matrix)}, 579 * {@link #scale(float, float)}, {@link #translate(float, float)} and 580 * {@link #rotate(float)} instead of this method. 581 * 582 * @param matrix The matrix to replace the current matrix with. If it is 583 * null, set the current matrix to identity. 584 * 585 * @see #concat(Matrix) 586 */ 587 public void setMatrix(Matrix matrix) { 588 native_setMatrix(mNativeCanvasWrapper, 589 matrix == null ? 0 : matrix.native_instance); 590 } 591 592 /** 593 * Return, in ctm, the current transformation matrix. This does not alter 594 * the matrix in the canvas, but just returns a copy of it. 595 */ 596 @Deprecated 597 public void getMatrix(Matrix ctm) { 598 native_getCTM(mNativeCanvasWrapper, ctm.native_instance); 599 } 600 601 /** 602 * Return a new matrix with a copy of the canvas' current transformation 603 * matrix. 604 */ 605 @Deprecated 606 public final Matrix getMatrix() { 607 Matrix m = new Matrix(); 608 //noinspection deprecation 609 getMatrix(m); 610 return m; 611 } 612 613 /** 614 * Modify the current clip with the specified rectangle. 615 * 616 * @param rect The rect to intersect with the current clip 617 * @param op How the clip is modified 618 * @return true if the resulting clip is non-empty 619 */ 620 public boolean clipRect(RectF rect, Region.Op op) { 621 return native_clipRect(mNativeCanvasWrapper, rect.left, rect.top, rect.right, rect.bottom, 622 op.nativeInt); 623 } 624 625 /** 626 * Modify the current clip with the specified rectangle, which is 627 * expressed in local coordinates. 628 * 629 * @param rect The rectangle to intersect with the current clip. 630 * @param op How the clip is modified 631 * @return true if the resulting clip is non-empty 632 */ 633 public boolean clipRect(Rect rect, Region.Op op) { 634 return native_clipRect(mNativeCanvasWrapper, rect.left, rect.top, rect.right, rect.bottom, 635 op.nativeInt); 636 } 637 638 /** 639 * Intersect the current clip with the specified rectangle, which is 640 * expressed in local coordinates. 641 * 642 * @param rect The rectangle to intersect with the current clip. 643 * @return true if the resulting clip is non-empty 644 */ 645 public boolean clipRect(RectF rect) { 646 return native_clipRect(mNativeCanvasWrapper, rect.left, rect.top, rect.right, rect.bottom, 647 Region.Op.INTERSECT.nativeInt); 648 } 649 650 /** 651 * Intersect the current clip with the specified rectangle, which is 652 * expressed in local coordinates. 653 * 654 * @param rect The rectangle to intersect with the current clip. 655 * @return true if the resulting clip is non-empty 656 */ 657 public boolean clipRect(Rect rect) { 658 return native_clipRect(mNativeCanvasWrapper, rect.left, rect.top, rect.right, rect.bottom, 659 Region.Op.INTERSECT.nativeInt); 660 } 661 662 /** 663 * Modify the current clip with the specified rectangle, which is 664 * expressed in local coordinates. 665 * 666 * @param left The left side of the rectangle to intersect with the 667 * current clip 668 * @param top The top of the rectangle to intersect with the current 669 * clip 670 * @param right The right side of the rectangle to intersect with the 671 * current clip 672 * @param bottom The bottom of the rectangle to intersect with the current 673 * clip 674 * @param op How the clip is modified 675 * @return true if the resulting clip is non-empty 676 */ 677 public boolean clipRect(float left, float top, float right, float bottom, Region.Op op) { 678 return native_clipRect(mNativeCanvasWrapper, left, top, right, bottom, op.nativeInt); 679 } 680 681 /** 682 * Intersect the current clip with the specified rectangle, which is 683 * expressed in local coordinates. 684 * 685 * @param left The left side of the rectangle to intersect with the 686 * current clip 687 * @param top The top of the rectangle to intersect with the current clip 688 * @param right The right side of the rectangle to intersect with the 689 * current clip 690 * @param bottom The bottom of the rectangle to intersect with the current 691 * clip 692 * @return true if the resulting clip is non-empty 693 */ 694 public boolean clipRect(float left, float top, float right, float bottom) { 695 return native_clipRect(mNativeCanvasWrapper, left, top, right, bottom, 696 Region.Op.INTERSECT.nativeInt); 697 } 698 699 /** 700 * Intersect the current clip with the specified rectangle, which is 701 * expressed in local coordinates. 702 * 703 * @param left The left side of the rectangle to intersect with the 704 * current clip 705 * @param top The top of the rectangle to intersect with the current clip 706 * @param right The right side of the rectangle to intersect with the 707 * current clip 708 * @param bottom The bottom of the rectangle to intersect with the current 709 * clip 710 * @return true if the resulting clip is non-empty 711 */ 712 public boolean clipRect(int left, int top, int right, int bottom) { 713 return native_clipRect(mNativeCanvasWrapper, left, top, right, bottom, 714 Region.Op.INTERSECT.nativeInt); 715 } 716 717 /** 718 * Modify the current clip with the specified path. 719 * 720 * @param path The path to operate on the current clip 721 * @param op How the clip is modified 722 * @return true if the resulting is non-empty 723 */ 724 public boolean clipPath(Path path, Region.Op op) { 725 return native_clipPath(mNativeCanvasWrapper, path.ni(), op.nativeInt); 726 } 727 728 /** 729 * Intersect the current clip with the specified path. 730 * 731 * @param path The path to intersect with the current clip 732 * @return true if the resulting is non-empty 733 */ 734 public boolean clipPath(Path path) { 735 return clipPath(path, Region.Op.INTERSECT); 736 } 737 738 /** 739 * Modify the current clip with the specified region. Note that unlike 740 * clipRect() and clipPath() which transform their arguments by the 741 * current matrix, clipRegion() assumes its argument is already in the 742 * coordinate system of the current layer's bitmap, and so not 743 * transformation is performed. 744 * 745 * @param region The region to operate on the current clip, based on op 746 * @param op How the clip is modified 747 * @return true if the resulting is non-empty 748 * 749 * @deprecated Unlike all other clip calls this API does not respect the 750 * current matrix. Use {@link #clipRect(Rect)} as an alternative. 751 */ 752 public boolean clipRegion(Region region, Region.Op op) { 753 return native_clipRegion(mNativeCanvasWrapper, region.ni(), op.nativeInt); 754 } 755 756 /** 757 * Intersect the current clip with the specified region. Note that unlike 758 * clipRect() and clipPath() which transform their arguments by the 759 * current matrix, clipRegion() assumes its argument is already in the 760 * coordinate system of the current layer's bitmap, and so not 761 * transformation is performed. 762 * 763 * @param region The region to operate on the current clip, based on op 764 * @return true if the resulting is non-empty 765 * 766 * @deprecated Unlike all other clip calls this API does not respect the 767 * current matrix. Use {@link #clipRect(Rect)} as an alternative. 768 */ 769 public boolean clipRegion(Region region) { 770 return clipRegion(region, Region.Op.INTERSECT); 771 } 772 773 public DrawFilter getDrawFilter() { 774 return mDrawFilter; 775 } 776 777 public void setDrawFilter(DrawFilter filter) { 778 long nativeFilter = 0; 779 if (filter != null) { 780 nativeFilter = filter.mNativeInt; 781 } 782 mDrawFilter = filter; 783 nativeSetDrawFilter(mNativeCanvasWrapper, nativeFilter); 784 } 785 786 public enum EdgeType { 787 788 /** 789 * Black-and-White: Treat edges by just rounding to nearest pixel boundary 790 */ 791 BW(0), //!< treat edges by just rounding to nearest pixel boundary 792 793 /** 794 * Antialiased: Treat edges by rounding-out, since they may be antialiased 795 */ 796 AA(1); 797 798 EdgeType(int nativeInt) { 799 this.nativeInt = nativeInt; 800 } 801 802 /** 803 * @hide 804 */ 805 public final int nativeInt; 806 } 807 808 /** 809 * Return true if the specified rectangle, after being transformed by the 810 * current matrix, would lie completely outside of the current clip. Call 811 * this to check if an area you intend to draw into is clipped out (and 812 * therefore you can skip making the draw calls). 813 * 814 * @param rect the rect to compare with the current clip 815 * @param type {@link Canvas.EdgeType#AA} if the path should be considered antialiased, 816 * since that means it may affect a larger area (more pixels) than 817 * non-antialiased ({@link Canvas.EdgeType#BW}). 818 * @return true if the rect (transformed by the canvas' matrix) 819 * does not intersect with the canvas' clip 820 */ 821 public boolean quickReject(RectF rect, EdgeType type) { 822 return native_quickReject(mNativeCanvasWrapper, 823 rect.left, rect.top, rect.right, rect.bottom); 824 } 825 826 /** 827 * Return true if the specified path, after being transformed by the 828 * current matrix, would lie completely outside of the current clip. Call 829 * this to check if an area you intend to draw into is clipped out (and 830 * therefore you can skip making the draw calls). Note: for speed it may 831 * return false even if the path itself might not intersect the clip 832 * (i.e. the bounds of the path intersects, but the path does not). 833 * 834 * @param path The path to compare with the current clip 835 * @param type {@link Canvas.EdgeType#AA} if the path should be considered antialiased, 836 * since that means it may affect a larger area (more pixels) than 837 * non-antialiased ({@link Canvas.EdgeType#BW}). 838 * @return true if the path (transformed by the canvas' matrix) 839 * does not intersect with the canvas' clip 840 */ 841 public boolean quickReject(Path path, EdgeType type) { 842 return native_quickReject(mNativeCanvasWrapper, path.ni()); 843 } 844 845 /** 846 * Return true if the specified rectangle, after being transformed by the 847 * current matrix, would lie completely outside of the current clip. Call 848 * this to check if an area you intend to draw into is clipped out (and 849 * therefore you can skip making the draw calls). 850 * 851 * @param left The left side of the rectangle to compare with the 852 * current clip 853 * @param top The top of the rectangle to compare with the current 854 * clip 855 * @param right The right side of the rectangle to compare with the 856 * current clip 857 * @param bottom The bottom of the rectangle to compare with the 858 * current clip 859 * @param type {@link Canvas.EdgeType#AA} if the path should be considered antialiased, 860 * since that means it may affect a larger area (more pixels) than 861 * non-antialiased ({@link Canvas.EdgeType#BW}). 862 * @return true if the rect (transformed by the canvas' matrix) 863 * does not intersect with the canvas' clip 864 */ 865 public boolean quickReject(float left, float top, float right, float bottom, 866 EdgeType type) { 867 return native_quickReject(mNativeCanvasWrapper, left, top, right, bottom); 868 } 869 870 /** 871 * Return the bounds of the current clip (in local coordinates) in the 872 * bounds parameter, and return true if it is non-empty. This can be useful 873 * in a way similar to quickReject, in that it tells you that drawing 874 * outside of these bounds will be clipped out. 875 * 876 * @param bounds Return the clip bounds here. If it is null, ignore it but 877 * still return true if the current clip is non-empty. 878 * @return true if the current clip is non-empty. 879 */ 880 public boolean getClipBounds(Rect bounds) { 881 return native_getClipBounds(mNativeCanvasWrapper, bounds); 882 } 883 884 /** 885 * Retrieve the bounds of the current clip (in local coordinates). 886 * 887 * @return the clip bounds, or [0, 0, 0, 0] if the clip is empty. 888 */ 889 public final Rect getClipBounds() { 890 Rect r = new Rect(); 891 getClipBounds(r); 892 return r; 893 } 894 895 /** 896 * Fill the entire canvas' bitmap (restricted to the current clip) with the 897 * specified RGB color, using srcover porterduff mode. 898 * 899 * @param r red component (0..255) of the color to draw onto the canvas 900 * @param g green component (0..255) of the color to draw onto the canvas 901 * @param b blue component (0..255) of the color to draw onto the canvas 902 */ 903 public void drawRGB(int r, int g, int b) { 904 native_drawRGB(mNativeCanvasWrapper, r, g, b); 905 } 906 907 /** 908 * Fill the entire canvas' bitmap (restricted to the current clip) with the 909 * specified ARGB color, using srcover porterduff mode. 910 * 911 * @param a alpha component (0..255) of the color to draw onto the canvas 912 * @param r red component (0..255) of the color to draw onto the canvas 913 * @param g green component (0..255) of the color to draw onto the canvas 914 * @param b blue component (0..255) of the color to draw onto the canvas 915 */ 916 public void drawARGB(int a, int r, int g, int b) { 917 native_drawARGB(mNativeCanvasWrapper, a, r, g, b); 918 } 919 920 /** 921 * Fill the entire canvas' bitmap (restricted to the current clip) with the 922 * specified color, using srcover porterduff mode. 923 * 924 * @param color the color to draw onto the canvas 925 */ 926 public void drawColor(int color) { 927 native_drawColor(mNativeCanvasWrapper, color); 928 } 929 930 /** 931 * Fill the entire canvas' bitmap (restricted to the current clip) with the 932 * specified color and porter-duff xfermode. 933 * 934 * @param color the color to draw with 935 * @param mode the porter-duff mode to apply to the color 936 */ 937 public void drawColor(int color, PorterDuff.Mode mode) { 938 native_drawColor(mNativeCanvasWrapper, color, mode.nativeInt); 939 } 940 941 /** 942 * Fill the entire canvas' bitmap (restricted to the current clip) with 943 * the specified paint. This is equivalent (but faster) to drawing an 944 * infinitely large rectangle with the specified paint. 945 * 946 * @param paint The paint used to draw onto the canvas 947 */ 948 public void drawPaint(Paint paint) { 949 native_drawPaint(mNativeCanvasWrapper, paint.mNativePaint); 950 } 951 952 /** 953 * Draw a series of points. Each point is centered at the coordinate 954 * specified by pts[], and its diameter is specified by the paint's stroke 955 * width (as transformed by the canvas' CTM), with special treatment for 956 * a stroke width of 0, which always draws exactly 1 pixel (or at most 4 957 * if antialiasing is enabled). The shape of the point is controlled by 958 * the paint's Cap type. The shape is a square, unless the cap type is 959 * Round, in which case the shape is a circle. 960 * 961 * @param pts Array of points to draw [x0 y0 x1 y1 x2 y2 ...] 962 * @param offset Number of values to skip before starting to draw. 963 * @param count The number of values to process, after skipping offset 964 * of them. Since one point uses two values, the number of 965 * "points" that are drawn is really (count >> 1). 966 * @param paint The paint used to draw the points 967 */ 968 public void drawPoints(float[] pts, int offset, int count, Paint paint) { 969 native_drawPoints(mNativeCanvasWrapper, pts, offset, count, paint.mNativePaint); 970 } 971 972 /** 973 * Helper for drawPoints() that assumes you want to draw the entire array 974 */ 975 public void drawPoints(float[] pts, Paint paint) { 976 drawPoints(pts, 0, pts.length, paint); 977 } 978 979 /** 980 * Helper for drawPoints() for drawing a single point. 981 */ 982 public void drawPoint(float x, float y, Paint paint) { 983 native_drawPoint(mNativeCanvasWrapper, x, y, paint.mNativePaint); 984 } 985 986 /** 987 * Draw a line segment with the specified start and stop x,y coordinates, 988 * using the specified paint. 989 * 990 * <p>Note that since a line is always "framed", the Style is ignored in the paint.</p> 991 * 992 * <p>Degenerate lines (length is 0) will not be drawn.</p> 993 * 994 * @param startX The x-coordinate of the start point of the line 995 * @param startY The y-coordinate of the start point of the line 996 * @param paint The paint used to draw the line 997 */ 998 public void drawLine(float startX, float startY, float stopX, float stopY, Paint paint) { 999 native_drawLine(mNativeCanvasWrapper, startX, startY, stopX, stopY, paint.mNativePaint); 1000 } 1001 1002 /** 1003 * Draw a series of lines. Each line is taken from 4 consecutive values 1004 * in the pts array. Thus to draw 1 line, the array must contain at least 4 1005 * values. This is logically the same as drawing the array as follows: 1006 * drawLine(pts[0], pts[1], pts[2], pts[3]) followed by 1007 * drawLine(pts[4], pts[5], pts[6], pts[7]) and so on. 1008 * 1009 * @param pts Array of points to draw [x0 y0 x1 y1 x2 y2 ...] 1010 * @param offset Number of values in the array to skip before drawing. 1011 * @param count The number of values in the array to process, after 1012 * skipping "offset" of them. Since each line uses 4 values, 1013 * the number of "lines" that are drawn is really 1014 * (count >> 2). 1015 * @param paint The paint used to draw the points 1016 */ 1017 public void drawLines(float[] pts, int offset, int count, Paint paint) { 1018 native_drawLines(mNativeCanvasWrapper, pts, offset, count, paint.mNativePaint); 1019 } 1020 1021 public void drawLines(float[] pts, Paint paint) { 1022 drawLines(pts, 0, pts.length, paint); 1023 } 1024 1025 /** 1026 * Draw the specified Rect using the specified paint. The rectangle will 1027 * be filled or framed based on the Style in the paint. 1028 * 1029 * @param rect The rect to be drawn 1030 * @param paint The paint used to draw the rect 1031 */ 1032 public void drawRect(RectF rect, Paint paint) { 1033 native_drawRect(mNativeCanvasWrapper, 1034 rect.left, rect.top, rect.right, rect.bottom, paint.mNativePaint); 1035 } 1036 1037 /** 1038 * Draw the specified Rect using the specified Paint. The rectangle 1039 * will be filled or framed based on the Style in the paint. 1040 * 1041 * @param r The rectangle to be drawn. 1042 * @param paint The paint used to draw the rectangle 1043 */ 1044 public void drawRect(Rect r, Paint paint) { 1045 drawRect(r.left, r.top, r.right, r.bottom, paint); 1046 } 1047 1048 1049 /** 1050 * Draw the specified Rect using the specified paint. The rectangle will 1051 * be filled or framed based on the Style in the paint. 1052 * 1053 * @param left The left side of the rectangle to be drawn 1054 * @param top The top side of the rectangle to be drawn 1055 * @param right The right side of the rectangle to be drawn 1056 * @param bottom The bottom side of the rectangle to be drawn 1057 * @param paint The paint used to draw the rect 1058 */ 1059 public void drawRect(float left, float top, float right, float bottom, Paint paint) { 1060 native_drawRect(mNativeCanvasWrapper, left, top, right, bottom, paint.mNativePaint); 1061 } 1062 1063 /** 1064 * Draw the specified oval using the specified paint. The oval will be 1065 * filled or framed based on the Style in the paint. 1066 * 1067 * @param oval The rectangle bounds of the oval to be drawn 1068 */ 1069 public void drawOval(RectF oval, Paint paint) { 1070 if (oval == null) { 1071 throw new NullPointerException(); 1072 } 1073 native_drawOval(mNativeCanvasWrapper, oval, paint.mNativePaint); 1074 } 1075 1076 /** 1077 * Draw the specified circle using the specified paint. If radius is <= 0, 1078 * then nothing will be drawn. The circle will be filled or framed based 1079 * on the Style in the paint. 1080 * 1081 * @param cx The x-coordinate of the center of the cirle to be drawn 1082 * @param cy The y-coordinate of the center of the cirle to be drawn 1083 * @param radius The radius of the cirle to be drawn 1084 * @param paint The paint used to draw the circle 1085 */ 1086 public void drawCircle(float cx, float cy, float radius, Paint paint) { 1087 native_drawCircle(mNativeCanvasWrapper, cx, cy, radius, paint.mNativePaint); 1088 } 1089 1090 /** 1091 * <p>Draw the specified arc, which will be scaled to fit inside the 1092 * specified oval.</p> 1093 * 1094 * <p>If the start angle is negative or >= 360, the start angle is treated 1095 * as start angle modulo 360.</p> 1096 * 1097 * <p>If the sweep angle is >= 360, then the oval is drawn 1098 * completely. Note that this differs slightly from SkPath::arcTo, which 1099 * treats the sweep angle modulo 360. If the sweep angle is negative, 1100 * the sweep angle is treated as sweep angle modulo 360</p> 1101 * 1102 * <p>The arc is drawn clockwise. An angle of 0 degrees correspond to the 1103 * geometric angle of 0 degrees (3 o'clock on a watch.)</p> 1104 * 1105 * @param oval The bounds of oval used to define the shape and size 1106 * of the arc 1107 * @param startAngle Starting angle (in degrees) where the arc begins 1108 * @param sweepAngle Sweep angle (in degrees) measured clockwise 1109 * @param useCenter If true, include the center of the oval in the arc, and 1110 close it if it is being stroked. This will draw a wedge 1111 * @param paint The paint used to draw the arc 1112 */ 1113 public void drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter, 1114 Paint paint) { 1115 if (oval == null) { 1116 throw new NullPointerException(); 1117 } 1118 native_drawArc(mNativeCanvasWrapper, oval, startAngle, sweepAngle, 1119 useCenter, paint.mNativePaint); 1120 } 1121 1122 /** 1123 * Draw the specified round-rect using the specified paint. The roundrect 1124 * will be filled or framed based on the Style in the paint. 1125 * 1126 * @param rect The rectangular bounds of the roundRect to be drawn 1127 * @param rx The x-radius of the oval used to round the corners 1128 * @param ry The y-radius of the oval used to round the corners 1129 * @param paint The paint used to draw the roundRect 1130 */ 1131 public void drawRoundRect(RectF rect, float rx, float ry, Paint paint) { 1132 drawRoundRect(rect.left, rect.top, rect.right, rect.bottom, rx, ry, paint); 1133 } 1134 1135 /** 1136 * Draw the specified round-rect using the specified paint. The roundrect 1137 * will be filled or framed based on the Style in the paint. 1138 * 1139 * @param rx The x-radius of the oval used to round the corners 1140 * @param ry The y-radius of the oval used to round the corners 1141 * @param paint The paint used to draw the roundRect 1142 */ 1143 public void drawRoundRect(float left, float top, float right, float bottom, float rx, float ry, 1144 Paint paint) { 1145 native_drawRoundRect(mNativeCanvasWrapper, left, top, right, bottom, rx, ry, paint.mNativePaint); 1146 } 1147 1148 /** 1149 * Draw the specified path using the specified paint. The path will be 1150 * filled or framed based on the Style in the paint. 1151 * 1152 * @param path The path to be drawn 1153 * @param paint The paint used to draw the path 1154 */ 1155 public void drawPath(Path path, Paint paint) { 1156 native_drawPath(mNativeCanvasWrapper, path.ni(), paint.mNativePaint); 1157 } 1158 1159 /** 1160 * @hide 1161 */ 1162 protected static void throwIfCannotDraw(Bitmap bitmap) { 1163 if (bitmap.isRecycled()) { 1164 throw new RuntimeException("Canvas: trying to use a recycled bitmap " + bitmap); 1165 } 1166 if (!bitmap.isPremultiplied() && bitmap.getConfig() == Bitmap.Config.ARGB_8888 && 1167 bitmap.hasAlpha()) { 1168 throw new RuntimeException("Canvas: trying to use a non-premultiplied bitmap " 1169 + bitmap); 1170 } 1171 } 1172 1173 /** 1174 * Draws the specified bitmap as an N-patch (most often, a 9-patches.) 1175 * 1176 * @param patch The ninepatch object to render 1177 * @param dst The destination rectangle. 1178 * @param paint The paint to draw the bitmap with. may be null 1179 * 1180 * @hide 1181 */ 1182 public void drawPatch(NinePatch patch, Rect dst, Paint paint) { 1183 patch.drawSoftware(this, dst, paint); 1184 } 1185 1186 /** 1187 * Draws the specified bitmap as an N-patch (most often, a 9-patches.) 1188 * 1189 * @param patch The ninepatch object to render 1190 * @param dst The destination rectangle. 1191 * @param paint The paint to draw the bitmap with. may be null 1192 * 1193 * @hide 1194 */ 1195 public void drawPatch(NinePatch patch, RectF dst, Paint paint) { 1196 patch.drawSoftware(this, dst, paint); 1197 } 1198 1199 /** 1200 * Draw the specified bitmap, with its top/left corner at (x,y), using 1201 * the specified paint, transformed by the current matrix. 1202 * 1203 * <p>Note: if the paint contains a maskfilter that generates a mask which 1204 * extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), 1205 * then the bitmap will be drawn as if it were in a Shader with CLAMP mode. 1206 * Thus the color outside of the original width/height will be the edge 1207 * color replicated. 1208 * 1209 * <p>If the bitmap and canvas have different densities, this function 1210 * will take care of automatically scaling the bitmap to draw at the 1211 * same density as the canvas. 1212 * 1213 * @param bitmap The bitmap to be drawn 1214 * @param left The position of the left side of the bitmap being drawn 1215 * @param top The position of the top side of the bitmap being drawn 1216 * @param paint The paint used to draw the bitmap (may be null) 1217 */ 1218 public void drawBitmap(Bitmap bitmap, float left, float top, Paint paint) { 1219 throwIfCannotDraw(bitmap); 1220 native_drawBitmap(mNativeCanvasWrapper, bitmap.ni(), left, top, 1221 paint != null ? paint.mNativePaint : 0, mDensity, mScreenDensity, bitmap.mDensity); 1222 } 1223 1224 /** 1225 * Draw the specified bitmap, scaling/translating automatically to fill 1226 * the destination rectangle. If the source rectangle is not null, it 1227 * specifies the subset of the bitmap to draw. 1228 * 1229 * <p>Note: if the paint contains a maskfilter that generates a mask which 1230 * extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), 1231 * then the bitmap will be drawn as if it were in a Shader with CLAMP mode. 1232 * Thus the color outside of the original width/height will be the edge 1233 * color replicated. 1234 * 1235 * <p>This function <em>ignores the density associated with the bitmap</em>. 1236 * This is because the source and destination rectangle coordinate 1237 * spaces are in their respective densities, so must already have the 1238 * appropriate scaling factor applied. 1239 * 1240 * @param bitmap The bitmap to be drawn 1241 * @param src May be null. The subset of the bitmap to be drawn 1242 * @param dst The rectangle that the bitmap will be scaled/translated 1243 * to fit into 1244 * @param paint May be null. The paint used to draw the bitmap 1245 */ 1246 public void drawBitmap(Bitmap bitmap, Rect src, RectF dst, Paint paint) { 1247 if (dst == null) { 1248 throw new NullPointerException(); 1249 } 1250 throwIfCannotDraw(bitmap); 1251 native_drawBitmap(mNativeCanvasWrapper, bitmap.ni(), src, dst, 1252 paint != null ? paint.mNativePaint : 0, mScreenDensity, bitmap.mDensity); 1253 } 1254 1255 /** 1256 * Draw the specified bitmap, scaling/translating automatically to fill 1257 * the destination rectangle. If the source rectangle is not null, it 1258 * specifies the subset of the bitmap to draw. 1259 * 1260 * <p>Note: if the paint contains a maskfilter that generates a mask which 1261 * extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), 1262 * then the bitmap will be drawn as if it were in a Shader with CLAMP mode. 1263 * Thus the color outside of the original width/height will be the edge 1264 * color replicated. 1265 * 1266 * <p>This function <em>ignores the density associated with the bitmap</em>. 1267 * This is because the source and destination rectangle coordinate 1268 * spaces are in their respective densities, so must already have the 1269 * appropriate scaling factor applied. 1270 * 1271 * @param bitmap The bitmap to be drawn 1272 * @param src May be null. The subset of the bitmap to be drawn 1273 * @param dst The rectangle that the bitmap will be scaled/translated 1274 * to fit into 1275 * @param paint May be null. The paint used to draw the bitmap 1276 */ 1277 public void drawBitmap(Bitmap bitmap, Rect src, Rect dst, Paint paint) { 1278 if (dst == null) { 1279 throw new NullPointerException(); 1280 } 1281 throwIfCannotDraw(bitmap); 1282 native_drawBitmap(mNativeCanvasWrapper, bitmap.ni(), src, dst, 1283 paint != null ? paint.mNativePaint : 0, mScreenDensity, bitmap.mDensity); 1284 } 1285 1286 /** 1287 * Treat the specified array of colors as a bitmap, and draw it. This gives 1288 * the same result as first creating a bitmap from the array, and then 1289 * drawing it, but this method avoids explicitly creating a bitmap object 1290 * which can be more efficient if the colors are changing often. 1291 * 1292 * @param colors Array of colors representing the pixels of the bitmap 1293 * @param offset Offset into the array of colors for the first pixel 1294 * @param stride The number of colors in the array between rows (must be 1295 * >= width or <= -width). 1296 * @param x The X coordinate for where to draw the bitmap 1297 * @param y The Y coordinate for where to draw the bitmap 1298 * @param width The width of the bitmap 1299 * @param height The height of the bitmap 1300 * @param hasAlpha True if the alpha channel of the colors contains valid 1301 * values. If false, the alpha byte is ignored (assumed to 1302 * be 0xFF for every pixel). 1303 * @param paint May be null. The paint used to draw the bitmap 1304 * 1305 * @deprecated Usage with a {@link #isHardwareAccelerated() hardware accelerated} canvas 1306 * requires an internal copy of color buffer contents every time this method is called. Using a 1307 * Bitmap avoids this copy, and allows the application to more explicitly control the lifetime 1308 * and copies of pixel data. 1309 */ 1310 @Deprecated 1311 public void drawBitmap(int[] colors, int offset, int stride, float x, float y, 1312 int width, int height, boolean hasAlpha, Paint paint) { 1313 // check for valid input 1314 if (width < 0) { 1315 throw new IllegalArgumentException("width must be >= 0"); 1316 } 1317 if (height < 0) { 1318 throw new IllegalArgumentException("height must be >= 0"); 1319 } 1320 if (Math.abs(stride) < width) { 1321 throw new IllegalArgumentException("abs(stride) must be >= width"); 1322 } 1323 int lastScanline = offset + (height - 1) * stride; 1324 int length = colors.length; 1325 if (offset < 0 || (offset + width > length) || lastScanline < 0 1326 || (lastScanline + width > length)) { 1327 throw new ArrayIndexOutOfBoundsException(); 1328 } 1329 // quick escape if there's nothing to draw 1330 if (width == 0 || height == 0) { 1331 return; 1332 } 1333 // punch down to native for the actual draw 1334 native_drawBitmap(mNativeCanvasWrapper, colors, offset, stride, x, y, width, height, hasAlpha, 1335 paint != null ? paint.mNativePaint : 0); 1336 } 1337 1338 /** 1339 * Legacy version of drawBitmap(int[] colors, ...) that took ints for x,y 1340 * 1341 * @deprecated Usage with a {@link #isHardwareAccelerated() hardware accelerated} canvas 1342 * requires an internal copy of color buffer contents every time this method is called. Using a 1343 * Bitmap avoids this copy, and allows the application to more explicitly control the lifetime 1344 * and copies of pixel data. 1345 */ 1346 @Deprecated 1347 public void drawBitmap(int[] colors, int offset, int stride, int x, int y, 1348 int width, int height, boolean hasAlpha, Paint paint) { 1349 // call through to the common float version 1350 drawBitmap(colors, offset, stride, (float)x, (float)y, width, height, 1351 hasAlpha, paint); 1352 } 1353 1354 /** 1355 * Draw the bitmap using the specified matrix. 1356 * 1357 * @param bitmap The bitmap to draw 1358 * @param matrix The matrix used to transform the bitmap when it is drawn 1359 * @param paint May be null. The paint used to draw the bitmap 1360 */ 1361 public void drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint) { 1362 nativeDrawBitmapMatrix(mNativeCanvasWrapper, bitmap.ni(), matrix.ni(), 1363 paint != null ? paint.mNativePaint : 0); 1364 } 1365 1366 /** 1367 * @hide 1368 */ 1369 protected static void checkRange(int length, int offset, int count) { 1370 if ((offset | count) < 0 || offset + count > length) { 1371 throw new ArrayIndexOutOfBoundsException(); 1372 } 1373 } 1374 1375 /** 1376 * Draw the bitmap through the mesh, where mesh vertices are evenly 1377 * distributed across the bitmap. There are meshWidth+1 vertices across, and 1378 * meshHeight+1 vertices down. The verts array is accessed in row-major 1379 * order, so that the first meshWidth+1 vertices are distributed across the 1380 * top of the bitmap from left to right. A more general version of this 1381 * method is drawVertices(). 1382 * 1383 * @param bitmap The bitmap to draw using the mesh 1384 * @param meshWidth The number of columns in the mesh. Nothing is drawn if 1385 * this is 0 1386 * @param meshHeight The number of rows in the mesh. Nothing is drawn if 1387 * this is 0 1388 * @param verts Array of x,y pairs, specifying where the mesh should be 1389 * drawn. There must be at least 1390 * (meshWidth+1) * (meshHeight+1) * 2 + vertOffset values 1391 * in the array 1392 * @param vertOffset Number of verts elements to skip before drawing 1393 * @param colors May be null. Specifies a color at each vertex, which is 1394 * interpolated across the cell, and whose values are 1395 * multiplied by the corresponding bitmap colors. If not null, 1396 * there must be at least (meshWidth+1) * (meshHeight+1) + 1397 * colorOffset values in the array. 1398 * @param colorOffset Number of color elements to skip before drawing 1399 * @param paint May be null. The paint used to draw the bitmap 1400 */ 1401 public void drawBitmapMesh(Bitmap bitmap, int meshWidth, int meshHeight, 1402 float[] verts, int vertOffset, int[] colors, int colorOffset, Paint paint) { 1403 if ((meshWidth | meshHeight | vertOffset | colorOffset) < 0) { 1404 throw new ArrayIndexOutOfBoundsException(); 1405 } 1406 if (meshWidth == 0 || meshHeight == 0) { 1407 return; 1408 } 1409 int count = (meshWidth + 1) * (meshHeight + 1); 1410 // we mul by 2 since we need two floats per vertex 1411 checkRange(verts.length, vertOffset, count * 2); 1412 if (colors != null) { 1413 // no mul by 2, since we need only 1 color per vertex 1414 checkRange(colors.length, colorOffset, count); 1415 } 1416 nativeDrawBitmapMesh(mNativeCanvasWrapper, bitmap.ni(), meshWidth, meshHeight, 1417 verts, vertOffset, colors, colorOffset, 1418 paint != null ? paint.mNativePaint : 0); 1419 } 1420 1421 public enum VertexMode { 1422 TRIANGLES(0), 1423 TRIANGLE_STRIP(1), 1424 TRIANGLE_FAN(2); 1425 1426 VertexMode(int nativeInt) { 1427 this.nativeInt = nativeInt; 1428 } 1429 1430 /** 1431 * @hide 1432 */ 1433 public final int nativeInt; 1434 } 1435 1436 /** 1437 * Draw the array of vertices, interpreted as triangles (based on mode). The 1438 * verts array is required, and specifies the x,y pairs for each vertex. If 1439 * texs is non-null, then it is used to specify the coordinate in shader 1440 * coordinates to use at each vertex (the paint must have a shader in this 1441 * case). If there is no texs array, but there is a color array, then each 1442 * color is interpolated across its corresponding triangle in a gradient. If 1443 * both texs and colors arrays are present, then they behave as before, but 1444 * the resulting color at each pixels is the result of multiplying the 1445 * colors from the shader and the color-gradient together. The indices array 1446 * is optional, but if it is present, then it is used to specify the index 1447 * of each triangle, rather than just walking through the arrays in order. 1448 * 1449 * @param mode How to interpret the array of vertices 1450 * @param vertexCount The number of values in the vertices array (and 1451 * corresponding texs and colors arrays if non-null). Each logical 1452 * vertex is two values (x, y), vertexCount must be a multiple of 2. 1453 * @param verts Array of vertices for the mesh 1454 * @param vertOffset Number of values in the verts to skip before drawing. 1455 * @param texs May be null. If not null, specifies the coordinates to sample 1456 * into the current shader (e.g. bitmap tile or gradient) 1457 * @param texOffset Number of values in texs to skip before drawing. 1458 * @param colors May be null. If not null, specifies a color for each 1459 * vertex, to be interpolated across the triangle. 1460 * @param colorOffset Number of values in colors to skip before drawing. 1461 * @param indices If not null, array of indices to reference into the 1462 * vertex (texs, colors) array. 1463 * @param indexCount number of entries in the indices array (if not null). 1464 * @param paint Specifies the shader to use if the texs array is non-null. 1465 */ 1466 public void drawVertices(VertexMode mode, int vertexCount, float[] verts, int vertOffset, 1467 float[] texs, int texOffset, int[] colors, int colorOffset, 1468 short[] indices, int indexOffset, int indexCount, Paint paint) { 1469 checkRange(verts.length, vertOffset, vertexCount); 1470 if (texs != null) { 1471 checkRange(texs.length, texOffset, vertexCount); 1472 } 1473 if (colors != null) { 1474 checkRange(colors.length, colorOffset, vertexCount / 2); 1475 } 1476 if (indices != null) { 1477 checkRange(indices.length, indexOffset, indexCount); 1478 } 1479 nativeDrawVertices(mNativeCanvasWrapper, mode.nativeInt, vertexCount, verts, 1480 vertOffset, texs, texOffset, colors, colorOffset, 1481 indices, indexOffset, indexCount, paint.mNativePaint); 1482 } 1483 1484 /** 1485 * Draw the text, with origin at (x,y), using the specified paint. The 1486 * origin is interpreted based on the Align setting in the paint. 1487 * 1488 * @param text The text to be drawn 1489 * @param x The x-coordinate of the origin of the text being drawn 1490 * @param y The y-coordinate of the origin of the text being drawn 1491 * @param paint The paint used for the text (e.g. color, size, style) 1492 */ 1493 public void drawText(char[] text, int index, int count, float x, float y, Paint paint) { 1494 if ((index | count | (index + count) | 1495 (text.length - index - count)) < 0) { 1496 throw new IndexOutOfBoundsException(); 1497 } 1498 native_drawText(mNativeCanvasWrapper, text, index, count, x, y, paint.mBidiFlags, 1499 paint.mNativePaint, paint.mNativeTypeface); 1500 } 1501 1502 /** 1503 * Draw the text, with origin at (x,y), using the specified paint. The 1504 * origin is interpreted based on the Align setting in the paint. 1505 * 1506 * @param text The text to be drawn 1507 * @param x The x-coordinate of the origin of the text being drawn 1508 * @param y The y-coordinate of the origin of the text being drawn 1509 * @param paint The paint used for the text (e.g. color, size, style) 1510 */ 1511 public void drawText(String text, float x, float y, Paint paint) { 1512 native_drawText(mNativeCanvasWrapper, text, 0, text.length(), x, y, paint.mBidiFlags, 1513 paint.mNativePaint, paint.mNativeTypeface); 1514 } 1515 1516 /** 1517 * Draw the text, with origin at (x,y), using the specified paint. 1518 * The origin is interpreted based on the Align setting in the paint. 1519 * 1520 * @param text The text to be drawn 1521 * @param start The index of the first character in text to draw 1522 * @param end (end - 1) is the index of the last character in text to draw 1523 * @param x The x-coordinate of the origin of the text being drawn 1524 * @param y The y-coordinate of the origin of the text being drawn 1525 * @param paint The paint used for the text (e.g. color, size, style) 1526 */ 1527 public void drawText(String text, int start, int end, float x, float y, Paint paint) { 1528 if ((start | end | (end - start) | (text.length() - end)) < 0) { 1529 throw new IndexOutOfBoundsException(); 1530 } 1531 native_drawText(mNativeCanvasWrapper, text, start, end, x, y, paint.mBidiFlags, 1532 paint.mNativePaint, paint.mNativeTypeface); 1533 } 1534 1535 /** 1536 * Draw the specified range of text, specified by start/end, with its 1537 * origin at (x,y), in the specified Paint. The origin is interpreted 1538 * based on the Align setting in the Paint. 1539 * 1540 * @param text The text to be drawn 1541 * @param start The index of the first character in text to draw 1542 * @param end (end - 1) is the index of the last character in text 1543 * to draw 1544 * @param x The x-coordinate of origin for where to draw the text 1545 * @param y The y-coordinate of origin for where to draw the text 1546 * @param paint The paint used for the text (e.g. color, size, style) 1547 */ 1548 public void drawText(CharSequence text, int start, int end, float x, float y, Paint paint) { 1549 if (text instanceof String || text instanceof SpannedString || 1550 text instanceof SpannableString) { 1551 native_drawText(mNativeCanvasWrapper, text.toString(), start, end, x, y, 1552 paint.mBidiFlags, paint.mNativePaint, paint.mNativeTypeface); 1553 } else if (text instanceof GraphicsOperations) { 1554 ((GraphicsOperations) text).drawText(this, start, end, x, y, 1555 paint); 1556 } else { 1557 char[] buf = TemporaryBuffer.obtain(end - start); 1558 TextUtils.getChars(text, start, end, buf, 0); 1559 native_drawText(mNativeCanvasWrapper, buf, 0, end - start, x, y, 1560 paint.mBidiFlags, paint.mNativePaint, paint.mNativeTypeface); 1561 TemporaryBuffer.recycle(buf); 1562 } 1563 } 1564 1565 /** 1566 * Render a run of all LTR or all RTL text, with shaping. This does not run 1567 * bidi on the provided text, but renders it as a uniform right-to-left or 1568 * left-to-right run, as indicated by dir. Alignment of the text is as 1569 * determined by the Paint's TextAlign value. 1570 * 1571 * @param text the text to render 1572 * @param index the start of the text to render 1573 * @param count the count of chars to render 1574 * @param contextIndex the start of the context for shaping. Must be 1575 * no greater than index. 1576 * @param contextCount the number of characters in the context for shaping. 1577 * ContexIndex + contextCount must be no less than index 1578 * + count. 1579 * @param x the x position at which to draw the text 1580 * @param y the y position at which to draw the text 1581 * @param dir the run direction, either {@link #DIRECTION_LTR} or 1582 * {@link #DIRECTION_RTL}. 1583 * @param paint the paint 1584 * @hide 1585 */ 1586 public void drawTextRun(char[] text, int index, int count, int contextIndex, int contextCount, 1587 float x, float y, int dir, Paint paint) { 1588 1589 if (text == null) { 1590 throw new NullPointerException("text is null"); 1591 } 1592 if (paint == null) { 1593 throw new NullPointerException("paint is null"); 1594 } 1595 if ((index | count | text.length - index - count) < 0) { 1596 throw new IndexOutOfBoundsException(); 1597 } 1598 if (dir != DIRECTION_LTR && dir != DIRECTION_RTL) { 1599 throw new IllegalArgumentException("unknown dir: " + dir); 1600 } 1601 1602 native_drawTextRun(mNativeCanvasWrapper, text, index, count, 1603 contextIndex, contextCount, x, y, dir, paint.mNativePaint, paint.mNativeTypeface); 1604 } 1605 1606 /** 1607 * Render a run of all LTR or all RTL text, with shaping. This does not run 1608 * bidi on the provided text, but renders it as a uniform right-to-left or 1609 * left-to-right run, as indicated by dir. Alignment of the text is as 1610 * determined by the Paint's TextAlign value. 1611 * 1612 * @param text the text to render 1613 * @param start the start of the text to render. Data before this position 1614 * can be used for shaping context. 1615 * @param end the end of the text to render. Data at or after this 1616 * position can be used for shaping context. 1617 * @param x the x position at which to draw the text 1618 * @param y the y position at which to draw the text 1619 * @param dir the run direction, either 0 for LTR or 1 for RTL. 1620 * @param paint the paint 1621 * @hide 1622 */ 1623 public void drawTextRun(CharSequence text, int start, int end, int contextStart, int contextEnd, 1624 float x, float y, int dir, Paint paint) { 1625 1626 if (text == null) { 1627 throw new NullPointerException("text is null"); 1628 } 1629 if (paint == null) { 1630 throw new NullPointerException("paint is null"); 1631 } 1632 if ((start | end | end - start | text.length() - end) < 0) { 1633 throw new IndexOutOfBoundsException(); 1634 } 1635 1636 int flags = dir == 0 ? 0 : 1; 1637 1638 if (text instanceof String || text instanceof SpannedString || 1639 text instanceof SpannableString) { 1640 native_drawTextRun(mNativeCanvasWrapper, text.toString(), start, end, 1641 contextStart, contextEnd, x, y, flags, paint.mNativePaint, paint.mNativeTypeface); 1642 } else if (text instanceof GraphicsOperations) { 1643 ((GraphicsOperations) text).drawTextRun(this, start, end, 1644 contextStart, contextEnd, x, y, flags, paint); 1645 } else { 1646 int contextLen = contextEnd - contextStart; 1647 int len = end - start; 1648 char[] buf = TemporaryBuffer.obtain(contextLen); 1649 TextUtils.getChars(text, contextStart, contextEnd, buf, 0); 1650 native_drawTextRun(mNativeCanvasWrapper, buf, start - contextStart, len, 1651 0, contextLen, x, y, flags, paint.mNativePaint, paint.mNativeTypeface); 1652 TemporaryBuffer.recycle(buf); 1653 } 1654 } 1655 1656 /** 1657 * Draw the text in the array, with each character's origin specified by 1658 * the pos array. 1659 * 1660 * This method does not support glyph composition and decomposition and 1661 * should therefore not be used to render complex scripts. 1662 * 1663 * @param text The text to be drawn 1664 * @param index The index of the first character to draw 1665 * @param count The number of characters to draw, starting from index. 1666 * @param pos Array of [x,y] positions, used to position each 1667 * character 1668 * @param paint The paint used for the text (e.g. color, size, style) 1669 */ 1670 @Deprecated 1671 public void drawPosText(char[] text, int index, int count, float[] pos, Paint paint) { 1672 if (index < 0 || index + count > text.length || count*2 > pos.length) { 1673 throw new IndexOutOfBoundsException(); 1674 } 1675 native_drawPosText(mNativeCanvasWrapper, text, index, count, pos, 1676 paint.mNativePaint); 1677 } 1678 1679 /** 1680 * Draw the text in the array, with each character's origin specified by 1681 * the pos array. 1682 * 1683 * This method does not support glyph composition and decomposition and 1684 * should therefore not be used to render complex scripts. 1685 * 1686 * @param text The text to be drawn 1687 * @param pos Array of [x,y] positions, used to position each character 1688 * @param paint The paint used for the text (e.g. color, size, style) 1689 */ 1690 @Deprecated 1691 public void drawPosText(String text, float[] pos, Paint paint) { 1692 if (text.length()*2 > pos.length) { 1693 throw new ArrayIndexOutOfBoundsException(); 1694 } 1695 native_drawPosText(mNativeCanvasWrapper, text, pos, paint.mNativePaint); 1696 } 1697 1698 /** 1699 * Draw the text, with origin at (x,y), using the specified paint, along 1700 * the specified path. The paint's Align setting determins where along the 1701 * path to start the text. 1702 * 1703 * @param text The text to be drawn 1704 * @param path The path the text should follow for its baseline 1705 * @param hOffset The distance along the path to add to the text's 1706 * starting position 1707 * @param vOffset The distance above(-) or below(+) the path to position 1708 * the text 1709 * @param paint The paint used for the text (e.g. color, size, style) 1710 */ 1711 public void drawTextOnPath(char[] text, int index, int count, Path path, 1712 float hOffset, float vOffset, Paint paint) { 1713 if (index < 0 || index + count > text.length) { 1714 throw new ArrayIndexOutOfBoundsException(); 1715 } 1716 native_drawTextOnPath(mNativeCanvasWrapper, text, index, count, 1717 path.ni(), hOffset, vOffset, 1718 paint.mBidiFlags, paint.mNativePaint); 1719 } 1720 1721 /** 1722 * Draw the text, with origin at (x,y), using the specified paint, along 1723 * the specified path. The paint's Align setting determins where along the 1724 * path to start the text. 1725 * 1726 * @param text The text to be drawn 1727 * @param path The path the text should follow for its baseline 1728 * @param hOffset The distance along the path to add to the text's 1729 * starting position 1730 * @param vOffset The distance above(-) or below(+) the path to position 1731 * the text 1732 * @param paint The paint used for the text (e.g. color, size, style) 1733 */ 1734 public void drawTextOnPath(String text, Path path, float hOffset, float vOffset, Paint paint) { 1735 if (text.length() > 0) { 1736 native_drawTextOnPath(mNativeCanvasWrapper, text, path.ni(), hOffset, vOffset, 1737 paint.mBidiFlags, paint.mNativePaint); 1738 } 1739 } 1740 1741 /** 1742 * Save the canvas state, draw the picture, and restore the canvas state. 1743 * This differs from picture.draw(canvas), which does not perform any 1744 * save/restore. 1745 * 1746 * <p> 1747 * <strong>Note:</strong> This forces the picture to internally call 1748 * {@link Picture#endRecording} in order to prepare for playback. 1749 * 1750 * @param picture The picture to be drawn 1751 */ 1752 public void drawPicture(Picture picture) { 1753 picture.endRecording(); 1754 int restoreCount = save(); 1755 picture.draw(this); 1756 restoreToCount(restoreCount); 1757 } 1758 1759 /** 1760 * Draw the picture, stretched to fit into the dst rectangle. 1761 */ 1762 public void drawPicture(Picture picture, RectF dst) { 1763 save(); 1764 translate(dst.left, dst.top); 1765 if (picture.getWidth() > 0 && picture.getHeight() > 0) { 1766 scale(dst.width() / picture.getWidth(), dst.height() / picture.getHeight()); 1767 } 1768 drawPicture(picture); 1769 restore(); 1770 } 1771 1772 /** 1773 * Draw the picture, stretched to fit into the dst rectangle. 1774 */ 1775 public void drawPicture(Picture picture, Rect dst) { 1776 save(); 1777 translate(dst.left, dst.top); 1778 if (picture.getWidth() > 0 && picture.getHeight() > 0) { 1779 scale((float) dst.width() / picture.getWidth(), 1780 (float) dst.height() / picture.getHeight()); 1781 } 1782 drawPicture(picture); 1783 restore(); 1784 } 1785 1786 /** 1787 * Releases the resources associated with this canvas. 1788 * 1789 * @hide 1790 */ 1791 public void release() { 1792 mFinalizer.dispose(); 1793 } 1794 1795 /** 1796 * Free up as much memory as possible from private caches (e.g. fonts, images) 1797 * 1798 * @hide 1799 */ 1800 public static native void freeCaches(); 1801 1802 /** 1803 * Free up text layout caches 1804 * 1805 * @hide 1806 */ 1807 public static native void freeTextLayoutCaches(); 1808 1809 private static native long initRaster(long nativeBitmapOrZero); 1810 private static native long initCanvas(long canvasHandle); 1811 private static native void native_setBitmap(long canvasHandle, 1812 long bitmapHandle, 1813 boolean copyState); 1814 private static native boolean native_isOpaque(long canvasHandle); 1815 private static native int native_getWidth(long canvasHandle); 1816 private static native int native_getHeight(long canvasHandle); 1817 1818 private static native int native_save(long canvasHandle, int saveFlags); 1819 private static native int native_saveLayer(long nativeCanvas, float l, 1820 float t, float r, float b, 1821 long nativePaint, 1822 int layerFlags); 1823 private static native int native_saveLayerAlpha(long nativeCanvas, float l, 1824 float t, float r, float b, 1825 int alpha, int layerFlags); 1826 private static native void native_restore(long canvasHandle); 1827 private static native void native_restoreToCount(long canvasHandle, 1828 int saveCount); 1829 private static native int native_getSaveCount(long canvasHandle); 1830 1831 private static native void native_translate(long canvasHandle, 1832 float dx, float dy); 1833 private static native void native_scale(long canvasHandle, 1834 float sx, float sy); 1835 private static native void native_rotate(long canvasHandle, float degrees); 1836 private static native void native_skew(long canvasHandle, 1837 float sx, float sy); 1838 private static native void native_concat(long nativeCanvas, 1839 long nativeMatrix); 1840 private static native void native_setMatrix(long nativeCanvas, 1841 long nativeMatrix); 1842 private static native boolean native_clipRect(long nativeCanvas, 1843 float left, float top, 1844 float right, float bottom, 1845 int regionOp); 1846 private static native boolean native_clipPath(long nativeCanvas, 1847 long nativePath, 1848 int regionOp); 1849 private static native boolean native_clipRegion(long nativeCanvas, 1850 long nativeRegion, 1851 int regionOp); 1852 private static native void nativeSetDrawFilter(long nativeCanvas, 1853 long nativeFilter); 1854 private static native boolean native_getClipBounds(long nativeCanvas, 1855 Rect bounds); 1856 private static native void native_getCTM(long nativeCanvas, 1857 long nativeMatrix); 1858 private static native boolean native_quickReject(long nativeCanvas, 1859 long nativePath); 1860 private static native boolean native_quickReject(long nativeCanvas, 1861 float left, float top, 1862 float right, float bottom); 1863 private static native void native_drawRGB(long nativeCanvas, int r, int g, 1864 int b); 1865 private static native void native_drawARGB(long nativeCanvas, int a, int r, 1866 int g, int b); 1867 private static native void native_drawColor(long nativeCanvas, int color); 1868 private static native void native_drawColor(long nativeCanvas, int color, 1869 int mode); 1870 private static native void native_drawPaint(long nativeCanvas, 1871 long nativePaint); 1872 private static native void native_drawPoint(long canvasHandle, float x, float y, 1873 long paintHandle); 1874 private static native void native_drawPoints(long canvasHandle, float[] pts, 1875 int offset, int count, 1876 long paintHandle); 1877 private static native void native_drawLine(long nativeCanvas, float startX, 1878 float startY, float stopX, 1879 float stopY, long nativePaint); 1880 private static native void native_drawLines(long canvasHandle, float[] pts, 1881 int offset, int count, 1882 long paintHandle); 1883 private static native void native_drawRect(long nativeCanvas, float left, 1884 float top, float right, 1885 float bottom, 1886 long nativePaint); 1887 private static native void native_drawOval(long nativeCanvas, RectF oval, 1888 long nativePaint); 1889 private static native void native_drawCircle(long nativeCanvas, float cx, 1890 float cy, float radius, 1891 long nativePaint); 1892 private static native void native_drawArc(long nativeCanvas, RectF oval, 1893 float startAngle, float sweep, 1894 boolean useCenter, 1895 long nativePaint); 1896 private static native void native_drawRoundRect(long nativeCanvas, 1897 float left, float top, float right, float bottom, 1898 float rx, float ry, long nativePaint); 1899 private static native void native_drawPath(long nativeCanvas, 1900 long nativePath, 1901 long nativePaint); 1902 private native void native_drawBitmap(long nativeCanvas, long nativeBitmap, 1903 float left, float top, 1904 long nativePaintOrZero, 1905 int canvasDensity, 1906 int screenDensity, 1907 int bitmapDensity); 1908 private native void native_drawBitmap(long nativeCanvas, long nativeBitmap, 1909 Rect src, RectF dst, 1910 long nativePaintOrZero, 1911 int screenDensity, 1912 int bitmapDensity); 1913 private static native void native_drawBitmap(long nativeCanvas, 1914 long nativeBitmap, 1915 Rect src, Rect dst, 1916 long nativePaintOrZero, 1917 int screenDensity, 1918 int bitmapDensity); 1919 private static native void native_drawBitmap(long nativeCanvas, int[] colors, 1920 int offset, int stride, float x, 1921 float y, int width, int height, 1922 boolean hasAlpha, 1923 long nativePaintOrZero); 1924 private static native void nativeDrawBitmapMatrix(long nativeCanvas, 1925 long nativeBitmap, 1926 long nativeMatrix, 1927 long nativePaint); 1928 private static native void nativeDrawBitmapMesh(long nativeCanvas, 1929 long nativeBitmap, 1930 int meshWidth, int meshHeight, 1931 float[] verts, int vertOffset, 1932 int[] colors, int colorOffset, 1933 long nativePaint); 1934 private static native void nativeDrawVertices(long nativeCanvas, int mode, int n, 1935 float[] verts, int vertOffset, float[] texs, int texOffset, 1936 int[] colors, int colorOffset, short[] indices, 1937 int indexOffset, int indexCount, long nativePaint); 1938 1939 private static native void native_drawText(long nativeCanvas, char[] text, 1940 int index, int count, float x, 1941 float y, int flags, long nativePaint, 1942 long nativeTypeface); 1943 private static native void native_drawText(long nativeCanvas, String text, 1944 int start, int end, float x, 1945 float y, int flags, long nativePaint, 1946 long nativeTypeface); 1947 1948 private static native void native_drawTextRun(long nativeCanvas, String text, 1949 int start, int end, int contextStart, int contextEnd, 1950 float x, float y, int flags, long nativePaint, long nativeTypeface); 1951 1952 private static native void native_drawTextRun(long nativeCanvas, char[] text, 1953 int start, int count, int contextStart, int contextCount, 1954 float x, float y, int flags, long nativePaint, long nativeTypeface); 1955 1956 private static native void native_drawPosText(long nativeCanvas, 1957 char[] text, int index, 1958 int count, float[] pos, 1959 long nativePaint); 1960 private static native void native_drawPosText(long nativeCanvas, 1961 String text, float[] pos, 1962 long nativePaint); 1963 private static native void native_drawTextOnPath(long nativeCanvas, 1964 char[] text, int index, 1965 int count, long nativePath, 1966 float hOffset, 1967 float vOffset, int bidiFlags, 1968 long nativePaint); 1969 private static native void native_drawTextOnPath(long nativeCanvas, 1970 String text, long nativePath, 1971 float hOffset, 1972 float vOffset, 1973 int flags, long nativePaint); 1974 private static native void finalizer(long nativeCanvas); 1975} 1976