Canvas.java revision 96e240f25a97c10bba863df328ed73a82c34ff61
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.TextUtils; 20import android.text.SpannedString; 21import android.text.SpannableString; 22import android.text.GraphicsOperations; 23import android.util.DisplayMetrics; 24 25import javax.microedition.khronos.opengles.GL; 26 27/** 28 * The Canvas class holds the "draw" calls. To draw something, you need 29 * 4 basic components: A Bitmap to hold the pixels, a Canvas to host 30 * the draw calls (writing into the bitmap), a drawing primitive (e.g. Rect, 31 * Path, text, Bitmap), and a paint (to describe the colors and styles for the 32 * drawing). 33 */ 34public class Canvas { 35 // assigned in constructors, freed in finalizer 36 final int mNativeCanvas; 37 38 /* Our native canvas can be either a raster, gl, or picture canvas. 39 If we are raster, then mGL will be null, and mBitmap may or may not be 40 present (our default constructor creates a raster canvas but no 41 java-bitmap is). If we are a gl-based, then mBitmap will be null, and 42 mGL will not be null. Thus both cannot be non-null, but its possible 43 for both to be null. 44 */ 45 private Bitmap mBitmap; // if not null, mGL must be null 46 private GL mGL; // if not null, mBitmap must be null 47 48 // optional field set by the caller 49 private DrawFilter mDrawFilter; 50 51 // Package-scoped for quick access. 52 /*package*/ int mDensity = Bitmap.DENSITY_NONE; 53 54 // Used by native code 55 @SuppressWarnings({"UnusedDeclaration"}) 56 private int mSurfaceFormat; 57 58 /** 59 * Construct an empty raster canvas. Use setBitmap() to specify a bitmap to 60 * draw into. The initial target density is {@link Bitmap#DENSITY_NONE}; 61 * this will typically be replaced when a target bitmap is set for the 62 * canvas. 63 */ 64 public Canvas() { 65 // 0 means no native bitmap 66 mNativeCanvas = initRaster(0); 67 } 68 69 /** 70 * Construct a canvas with the specified bitmap to draw into. The bitmap 71 * must be mutable. 72 * 73 * <p>The initial target density of the canvas is the same as the given 74 * bitmap's density. 75 * 76 * @param bitmap Specifies a mutable bitmap for the canvas to draw into. 77 */ 78 public Canvas(Bitmap bitmap) { 79 if (!bitmap.isMutable()) { 80 throw new IllegalStateException( 81 "Immutable bitmap passed to Canvas constructor"); 82 } 83 throwIfRecycled(bitmap); 84 mNativeCanvas = initRaster(bitmap.ni()); 85 mBitmap = bitmap; 86 mDensity = bitmap.mDensity; 87 } 88 89 /*package*/ Canvas(int nativeCanvas) { 90 if (nativeCanvas == 0) { 91 throw new IllegalStateException(); 92 } 93 mNativeCanvas = nativeCanvas; 94 mDensity = Bitmap.getDefaultDensity(); 95 } 96 97 /** 98 * Construct a canvas with the specified gl context. All drawing through 99 * this canvas will be redirected to OpenGL. Note: some features may not 100 * be supported in this mode (e.g. some GL implementations may not support 101 * antialiasing or certain effects like ColorMatrix or certain Xfermodes). 102 * However, no exception will be thrown in those cases. 103 * 104 * <p>The initial target density of the canvas is the same as the initial 105 * density of bitmaps as per {@link Bitmap#getDensity() Bitmap.getDensity()}. 106 */ 107 public Canvas(GL gl) { 108 mNativeCanvas = initGL(); 109 mGL = gl; 110 mDensity = Bitmap.getDefaultDensity(); 111 } 112 113 /** 114 * Return the GL object associated with this canvas, or null if it is not 115 * backed by GL. 116 */ 117 public GL getGL() { 118 return mGL; 119 } 120 121 /** 122 * Call this to free up OpenGL resources that may be cached or allocated 123 * on behalf of the Canvas. Any subsequent drawing with a GL-backed Canvas 124 * will have to recreate those resources. 125 */ 126 public static void freeGlCaches() { 127 freeCaches(); 128 } 129 130 /** 131 * Specify a bitmap for the canvas to draw into. As a side-effect, also 132 * updates the canvas's target density to match that of the bitmap. 133 * 134 * @param bitmap Specifies a mutable bitmap for the canvas to draw into. 135 * 136 * @see #setDensity(int) 137 * @see #getDensity() 138 */ 139 public void setBitmap(Bitmap bitmap) { 140 if (!bitmap.isMutable()) { 141 throw new IllegalStateException(); 142 } 143 if (mGL != null) { 144 throw new RuntimeException("Can't set a bitmap device on a GL canvas"); 145 } 146 throwIfRecycled(bitmap); 147 148 native_setBitmap(mNativeCanvas, bitmap.ni()); 149 mBitmap = bitmap; 150 mDensity = bitmap.mDensity; 151 } 152 153 /** 154 * Set the viewport dimensions if this canvas is GL based. If it is not, 155 * this method is ignored and no exception is thrown. 156 * 157 * @param width The width of the viewport 158 * @param height The height of the viewport 159 */ 160 public void setViewport(int width, int height) { 161 if (mGL != null) { 162 nativeSetViewport(mNativeCanvas, width, height); 163 } 164 } 165 166 /** 167 * Return true if the device that the current layer draws into is opaque 168 * (i.e. does not support per-pixel alpha). 169 * 170 * @return true if the device that the current layer draws into is opaque 171 */ 172 public native boolean isOpaque(); 173 174 /** 175 * Returns the width of the current drawing layer 176 * 177 * @return the width of the current drawing layer 178 */ 179 public native int getWidth(); 180 181 /** 182 * Returns the height of the current drawing layer 183 * 184 * @return the height of the current drawing layer 185 */ 186 public native int getHeight(); 187 188 /** 189 * <p>Returns the target density of the canvas. The default density is 190 * derived from the density of its backing bitmap, or 191 * {@link Bitmap#DENSITY_NONE} if there is not one.</p> 192 * 193 * @return Returns the current target density of the canvas, which is used 194 * to determine the scaling factor when drawing a bitmap into it. 195 * 196 * @see #setDensity(int) 197 * @see Bitmap#getDensity() 198 */ 199 public int getDensity() { 200 return mDensity; 201 } 202 203 /** 204 * <p>Specifies the density for this Canvas' backing bitmap. This modifies 205 * the target density of the canvas itself, as well as the density of its 206 * backing bitmap via {@link Bitmap#setDensity(int) Bitmap.setDensity(int)}. 207 * 208 * @param density The new target density of the canvas, which is used 209 * to determine the scaling factor when drawing a bitmap into it. Use 210 * {@link Bitmap#DENSITY_NONE} to disable bitmap scaling. 211 * 212 * @see #getDensity() 213 * @see Bitmap#setDensity(int) 214 */ 215 public void setDensity(int density) { 216 if (mBitmap != null) { 217 mBitmap.setDensity(density); 218 } 219 mDensity = density; 220 } 221 222 // the SAVE_FLAG constants must match their native equivalents 223 224 /** restore the current matrix when restore() is called */ 225 public static final int MATRIX_SAVE_FLAG = 0x01; 226 /** restore the current clip when restore() is called */ 227 public static final int CLIP_SAVE_FLAG = 0x02; 228 /** the layer needs to per-pixel alpha */ 229 public static final int HAS_ALPHA_LAYER_SAVE_FLAG = 0x04; 230 /** the layer needs to 8-bits per color component */ 231 public static final int FULL_COLOR_LAYER_SAVE_FLAG = 0x08; 232 /** clip against the layer's bounds */ 233 public static final int CLIP_TO_LAYER_SAVE_FLAG = 0x10; 234 /** restore everything when restore() is called */ 235 public static final int ALL_SAVE_FLAG = 0x1F; 236 237 /** 238 * Saves the current matrix and clip onto a private stack. Subsequent 239 * calls to translate,scale,rotate,skew,concat or clipRect,clipPath 240 * will all operate as usual, but when the balancing call to restore() 241 * is made, those calls will be forgotten, and the settings that existed 242 * before the save() will be reinstated. 243 * 244 * @return The value to pass to restoreToCount() to balance this save() 245 */ 246 public native int save(); 247 248 /** 249 * Based on saveFlags, can save the current matrix and clip onto a private 250 * stack. Subsequent calls to translate,scale,rotate,skew,concat or 251 * clipRect,clipPath will all operate as usual, but when the balancing 252 * call to restore() is made, those calls will be forgotten, and the 253 * settings that existed before the save() will be reinstated. 254 * 255 * @param saveFlags flag bits that specify which parts of the Canvas state 256 * to save/restore 257 * @return The value to pass to restoreToCount() to balance this save() 258 */ 259 public native int save(int saveFlags); 260 261 /** 262 * This behaves the same as save(), but in addition it allocates an 263 * offscreen bitmap. All drawing calls are directed there, and only when 264 * the balancing call to restore() is made is that offscreen transfered to 265 * the canvas (or the previous layer). Subsequent calls to translate, 266 * scale, rotate, skew, concat or clipRect, clipPath all operate on this 267 * copy. When the balancing call to restore() is made, this copy is 268 * deleted and the previous matrix/clip state is restored. 269 * 270 * @param bounds May be null. The maximum size the offscreen bitmap 271 * needs to be (in local coordinates) 272 * @param paint This is copied, and is applied to the offscreen when 273 * restore() is called. 274 * @param saveFlags see _SAVE_FLAG constants 275 * @return value to pass to restoreToCount() to balance this save() 276 */ 277 public int saveLayer(RectF bounds, Paint paint, int saveFlags) { 278 return native_saveLayer(mNativeCanvas, bounds, 279 paint != null ? paint.mNativePaint : 0, 280 saveFlags); 281 } 282 283 /** 284 * Helper version of saveLayer() that takes 4 values rather than a RectF. 285 */ 286 public int saveLayer(float left, float top, float right, float bottom, 287 Paint paint, int saveFlags) { 288 return native_saveLayer(mNativeCanvas, left, top, right, bottom, 289 paint != null ? paint.mNativePaint : 0, 290 saveFlags); 291 } 292 293 /** 294 * This behaves the same as save(), but in addition it allocates an 295 * offscreen bitmap. All drawing calls are directed there, and only when 296 * the balancing call to restore() is made is that offscreen transfered to 297 * the canvas (or the previous layer). Subsequent calls to translate, 298 * scale, rotate, skew, concat or clipRect, clipPath all operate on this 299 * copy. When the balancing call to restore() is made, this copy is 300 * deleted and the previous matrix/clip state is restored. 301 * 302 * @param bounds The maximum size the offscreen bitmap needs to be 303 * (in local coordinates) 304 * @param alpha The alpha to apply to the offscreen when when it is 305 drawn during restore() 306 * @param saveFlags see _SAVE_FLAG constants 307 * @return value to pass to restoreToCount() to balance this call 308 */ 309 public int saveLayerAlpha(RectF bounds, int alpha, int saveFlags) { 310 alpha = Math.min(255, Math.max(0, alpha)); 311 return native_saveLayerAlpha(mNativeCanvas, bounds, alpha, saveFlags); 312 } 313 314 /** 315 * Helper for saveLayerAlpha() that takes 4 values instead of a RectF. 316 */ 317 public int saveLayerAlpha(float left, float top, float right, float bottom, 318 int alpha, int saveFlags) { 319 return native_saveLayerAlpha(mNativeCanvas, left, top, right, bottom, 320 alpha, saveFlags); 321 } 322 323 /** 324 * This call balances a previous call to save(), and is used to remove all 325 * modifications to the matrix/clip state since the last save call. It is 326 * an error to call restore() more times than save() was called. 327 */ 328 public native void restore(); 329 330 /** 331 * Returns the number of matrix/clip states on the Canvas' private stack. 332 * This will equal # save() calls - # restore() calls. 333 */ 334 public native int getSaveCount(); 335 336 /** 337 * Efficient way to pop any calls to save() that happened after the save 338 * count reached saveCount. It is an error for saveCount to be less than 1. 339 * 340 * Example: 341 * int count = canvas.save(); 342 * ... // more calls potentially to save() 343 * canvas.restoreToCount(count); 344 * // now the canvas is back in the same state it was before the initial 345 * // call to save(). 346 * 347 * @param saveCount The save level to restore to. 348 */ 349 public native void restoreToCount(int saveCount); 350 351 /** 352 * Preconcat the current matrix with the specified translation 353 * 354 * @param dx The distance to translate in X 355 * @param dy The distance to translate in Y 356 */ 357 public native void translate(float dx, float dy); 358 359 /** 360 * Preconcat the current matrix with the specified scale. 361 * 362 * @param sx The amount to scale in X 363 * @param sy The amount to scale in Y 364 */ 365 public native void scale(float sx, float sy); 366 367 /** 368 * Preconcat the current matrix with the specified scale. 369 * 370 * @param sx The amount to scale in X 371 * @param sy The amount to scale in Y 372 * @param px The x-coord for the pivot point (unchanged by the rotation) 373 * @param py The y-coord for the pivot point (unchanged by the rotation) 374 */ 375 public final void scale(float sx, float sy, float px, float py) { 376 translate(px, py); 377 scale(sx, sy); 378 translate(-px, -py); 379 } 380 381 /** 382 * Preconcat the current matrix with the specified rotation. 383 * 384 * @param degrees The amount to rotate, in degrees 385 */ 386 public native void rotate(float degrees); 387 388 /** 389 * Preconcat the current matrix with the specified rotation. 390 * 391 * @param degrees The amount to rotate, in degrees 392 * @param px The x-coord for the pivot point (unchanged by the rotation) 393 * @param py The y-coord for the pivot point (unchanged by the rotation) 394 */ 395 public final void rotate(float degrees, float px, float py) { 396 translate(px, py); 397 rotate(degrees); 398 translate(-px, -py); 399 } 400 401 /** 402 * Preconcat the current matrix with the specified skew. 403 * 404 * @param sx The amount to skew in X 405 * @param sy The amount to skew in Y 406 */ 407 public native void skew(float sx, float sy); 408 409 /** 410 * Preconcat the current matrix with the specified matrix. 411 * 412 * @param matrix The matrix to preconcatenate with the current matrix 413 */ 414 public void concat(Matrix matrix) { 415 native_concat(mNativeCanvas, matrix.native_instance); 416 } 417 418 /** 419 * Completely replace the current matrix with the specified matrix. If the 420 * matrix parameter is null, then the current matrix is reset to identity. 421 * 422 * @param matrix The matrix to replace the current matrix with. If it is 423 * null, set the current matrix to identity. 424 */ 425 public void setMatrix(Matrix matrix) { 426 native_setMatrix(mNativeCanvas, 427 matrix == null ? 0 : matrix.native_instance); 428 } 429 430 /** 431 * Return, in ctm, the current transformation matrix. This does not alter 432 * the matrix in the canvas, but just returns a copy of it. 433 */ 434 public void getMatrix(Matrix ctm) { 435 native_getCTM(mNativeCanvas, ctm.native_instance); 436 } 437 438 /** 439 * Return a new matrix with a copy of the canvas' current transformation 440 * matrix. 441 */ 442 public final Matrix getMatrix() { 443 Matrix m = new Matrix(); 444 getMatrix(m); 445 return m; 446 } 447 448 /** 449 * Modify the current clip with the specified rectangle. 450 * 451 * @param rect The rect to intersect with the current clip 452 * @param op How the clip is modified 453 * @return true if the resulting clip is non-empty 454 */ 455 public boolean clipRect(RectF rect, Region.Op op) { 456 return native_clipRect(mNativeCanvas, 457 rect.left, rect.top, rect.right, rect.bottom, 458 op.nativeInt); 459 } 460 461 /** 462 * Modify the current clip with the specified rectangle, which is 463 * expressed in local coordinates. 464 * 465 * @param rect The rectangle to intersect with the current clip. 466 * @param op How the clip is modified 467 * @return true if the resulting clip is non-empty 468 */ 469 public boolean clipRect(Rect rect, Region.Op op) { 470 return native_clipRect(mNativeCanvas, 471 rect.left, rect.top, rect.right, rect.bottom, 472 op.nativeInt); 473 } 474 475 /** 476 * Intersect the current clip with the specified rectangle, which is 477 * expressed in local coordinates. 478 * 479 * @param rect The rectangle to intersect with the current clip. 480 * @return true if the resulting clip is non-empty 481 */ 482 public native boolean clipRect(RectF rect); 483 484 /** 485 * Intersect the current clip with the specified rectangle, which is 486 * expressed in local coordinates. 487 * 488 * @param rect The rectangle to intersect with the current clip. 489 * @return true if the resulting clip is non-empty 490 */ 491 public native boolean clipRect(Rect rect); 492 493 /** 494 * Modify the current clip with the specified rectangle, which is 495 * expressed in local coordinates. 496 * 497 * @param left The left side of the rectangle to intersect with the 498 * current clip 499 * @param top The top of the rectangle to intersect with the current 500 * clip 501 * @param right The right side of the rectangle to intersect with the 502 * current clip 503 * @param bottom The bottom of the rectangle to intersect with the current 504 * clip 505 * @param op How the clip is modified 506 * @return true if the resulting clip is non-empty 507 */ 508 public boolean clipRect(float left, float top, float right, float bottom, 509 Region.Op op) { 510 return native_clipRect(mNativeCanvas, left, top, right, bottom, 511 op.nativeInt); 512 } 513 514 /** 515 * Intersect the current clip with the specified rectangle, which is 516 * expressed in local coordinates. 517 * 518 * @param left The left side of the rectangle to intersect with the 519 * current clip 520 * @param top The top of the rectangle to intersect with the current clip 521 * @param right The right side of the rectangle to intersect with the 522 * current clip 523 * @param bottom The bottom of the rectangle to intersect with the current 524 * clip 525 * @return true if the resulting clip is non-empty 526 */ 527 public native boolean clipRect(float left, float top, 528 float right, float bottom); 529 530 /** 531 * Intersect the current clip with the specified rectangle, which is 532 * expressed in local coordinates. 533 * 534 * @param left The left side of the rectangle to intersect with the 535 * current clip 536 * @param top The top of the rectangle to intersect with the current clip 537 * @param right The right side of the rectangle to intersect with the 538 * current clip 539 * @param bottom The bottom of the rectangle to intersect with the current 540 * clip 541 * @return true if the resulting clip is non-empty 542 */ 543 public native boolean clipRect(int left, int top, 544 int right, int bottom); 545 546 /** 547 * Modify the current clip with the specified path. 548 * 549 * @param path The path to operate on the current clip 550 * @param op How the clip is modified 551 * @return true if the resulting is non-empty 552 */ 553 public boolean clipPath(Path path, Region.Op op) { 554 return native_clipPath(mNativeCanvas, path.ni(), op.nativeInt); 555 } 556 557 /** 558 * Intersect the current clip with the specified path. 559 * 560 * @param path The path to intersect with the current clip 561 * @return true if the resulting is non-empty 562 */ 563 public boolean clipPath(Path path) { 564 return clipPath(path, Region.Op.INTERSECT); 565 } 566 567 /** 568 * Modify the current clip with the specified region. Note that unlike 569 * clipRect() and clipPath() which transform their arguments by the 570 * current matrix, clipRegion() assumes its argument is already in the 571 * coordinate system of the current layer's bitmap, and so not 572 * transformation is performed. 573 * 574 * @param region The region to operate on the current clip, based on op 575 * @param op How the clip is modified 576 * @return true if the resulting is non-empty 577 */ 578 public boolean clipRegion(Region region, Region.Op op) { 579 return native_clipRegion(mNativeCanvas, region.ni(), op.nativeInt); 580 } 581 582 /** 583 * Intersect the current clip with the specified region. Note that unlike 584 * clipRect() and clipPath() which transform their arguments by the 585 * current matrix, clipRegion() assumes its argument is already in the 586 * coordinate system of the current layer's bitmap, and so not 587 * transformation is performed. 588 * 589 * @param region The region to operate on the current clip, based on op 590 * @return true if the resulting is non-empty 591 */ 592 public boolean clipRegion(Region region) { 593 return clipRegion(region, Region.Op.INTERSECT); 594 } 595 596 public DrawFilter getDrawFilter() { 597 return mDrawFilter; 598 } 599 600 public void setDrawFilter(DrawFilter filter) { 601 int nativeFilter = 0; 602 if (filter != null) { 603 nativeFilter = filter.mNativeInt; 604 } 605 mDrawFilter = filter; 606 nativeSetDrawFilter(mNativeCanvas, nativeFilter); 607 } 608 609 public enum EdgeType { 610 BW(0), //!< treat edges by just rounding to nearest pixel boundary 611 AA(1); //!< treat edges by rounding-out, since they may be antialiased 612 613 EdgeType(int nativeInt) { 614 this.nativeInt = nativeInt; 615 } 616 final int nativeInt; 617 } 618 619 /** 620 * Return true if the specified rectangle, after being transformed by the 621 * current matrix, would lie completely outside of the current clip. Call 622 * this to check if an area you intend to draw into is clipped out (and 623 * therefore you can skip making the draw calls). 624 * 625 * @param rect the rect to compare with the current clip 626 * @param type specifies how to treat the edges (BW or antialiased) 627 * @return true if the rect (transformed by the canvas' matrix) 628 * does not intersect with the canvas' clip 629 */ 630 public boolean quickReject(RectF rect, EdgeType type) { 631 return native_quickReject(mNativeCanvas, rect, type.nativeInt); 632 } 633 634 /** 635 * Return true if the specified path, after being transformed by the 636 * current matrix, would lie completely outside of the current clip. Call 637 * this to check if an area you intend to draw into is clipped out (and 638 * therefore you can skip making the draw calls). Note: for speed it may 639 * return false even if the path itself might not intersect the clip 640 * (i.e. the bounds of the path intersects, but the path does not). 641 * 642 * @param path The path to compare with the current clip 643 * @param type true if the path should be considered antialiased, 644 * since that means it may 645 * affect a larger area (more pixels) than 646 * non-antialiased. 647 * @return true if the path (transformed by the canvas' matrix) 648 * does not intersect with the canvas' clip 649 */ 650 public boolean quickReject(Path path, EdgeType type) { 651 return native_quickReject(mNativeCanvas, path.ni(), type.nativeInt); 652 } 653 654 /** 655 * Return true if the specified rectangle, after being transformed by the 656 * current matrix, would lie completely outside of the current clip. Call 657 * this to check if an area you intend to draw into is clipped out (and 658 * therefore you can skip making the draw calls). 659 * 660 * @param left The left side of the rectangle to compare with the 661 * current clip 662 * @param top The top of the rectangle to compare with the current 663 * clip 664 * @param right The right side of the rectangle to compare with the 665 * current clip 666 * @param bottom The bottom of the rectangle to compare with the 667 * current clip 668 * @param type true if the rect should be considered antialiased, 669 * since that means it may affect a larger area (more 670 * pixels) than non-antialiased. 671 * @return true if the rect (transformed by the canvas' matrix) 672 * does not intersect with the canvas' clip 673 */ 674 public boolean quickReject(float left, float top, float right, float bottom, 675 EdgeType type) { 676 return native_quickReject(mNativeCanvas, left, top, right, bottom, 677 type.nativeInt); 678 } 679 680 /** 681 * Retrieve the clip bounds, returning true if they are non-empty. 682 * 683 * @param bounds Return the clip bounds here. If it is null, ignore it but 684 * still return true if the current clip is non-empty. 685 * @return true if the current clip is non-empty. 686 */ 687 public boolean getClipBounds(Rect bounds) { 688 return native_getClipBounds(mNativeCanvas, bounds); 689 } 690 691 /** 692 * Retrieve the clip bounds. 693 * 694 * @return the clip bounds, or [0, 0, 0, 0] if the clip is empty. 695 */ 696 public final Rect getClipBounds() { 697 Rect r = new Rect(); 698 getClipBounds(r); 699 return r; 700 } 701 702 /** 703 * Fill the entire canvas' bitmap (restricted to the current clip) with the 704 * specified RGB color, using srcover porterduff mode. 705 * 706 * @param r red component (0..255) of the color to draw onto the canvas 707 * @param g green component (0..255) of the color to draw onto the canvas 708 * @param b blue component (0..255) of the color to draw onto the canvas 709 */ 710 public void drawRGB(int r, int g, int b) { 711 native_drawRGB(mNativeCanvas, r, g, b); 712 } 713 714 /** 715 * Fill the entire canvas' bitmap (restricted to the current clip) with the 716 * specified ARGB color, using srcover porterduff mode. 717 * 718 * @param a alpha component (0..255) of the color to draw onto the canvas 719 * @param r red component (0..255) of the color to draw onto the canvas 720 * @param g green component (0..255) of the color to draw onto the canvas 721 * @param b blue component (0..255) of the color to draw onto the canvas 722 */ 723 public void drawARGB(int a, int r, int g, int b) { 724 native_drawARGB(mNativeCanvas, a, r, g, b); 725 } 726 727 /** 728 * Fill the entire canvas' bitmap (restricted to the current clip) with the 729 * specified color, using srcover porterduff mode. 730 * 731 * @param color the color to draw onto the canvas 732 */ 733 public void drawColor(int color) { 734 native_drawColor(mNativeCanvas, color); 735 } 736 737 /** 738 * Fill the entire canvas' bitmap (restricted to the current clip) with the 739 * specified color and porter-duff xfermode. 740 * 741 * @param color the color to draw with 742 * @param mode the porter-duff mode to apply to the color 743 */ 744 public void drawColor(int color, PorterDuff.Mode mode) { 745 native_drawColor(mNativeCanvas, color, mode.nativeInt); 746 } 747 748 /** 749 * Fill the entire canvas' bitmap (restricted to the current clip) with 750 * the specified paint. This is equivalent (but faster) to drawing an 751 * infinitely large rectangle with the specified paint. 752 * 753 * @param paint The paint used to draw onto the canvas 754 */ 755 public void drawPaint(Paint paint) { 756 native_drawPaint(mNativeCanvas, paint.mNativePaint); 757 } 758 759 /** 760 * Draw a series of points. Each point is centered at the coordinate 761 * specified by pts[], and its diameter is specified by the paint's stroke 762 * width (as transformed by the canvas' CTM), with special treatment for 763 * a stroke width of 0, which always draws exactly 1 pixel (or at most 4 764 * if antialiasing is enabled). The shape of the point is controlled by 765 * the paint's Cap type. The shape is a square, unless the cap type is 766 * Round, in which case the shape is a circle. 767 * 768 * @param pts Array of points to draw [x0 y0 x1 y1 x2 y2 ...] 769 * @param offset Number of values to skip before starting to draw. 770 * @param count The number of values to process, after skipping offset 771 * of them. Since one point uses two values, the number of 772 * "points" that are drawn is really (count >> 1). 773 * @param paint The paint used to draw the points 774 */ 775 public native void drawPoints(float[] pts, int offset, int count, 776 Paint paint); 777 778 /** 779 * Helper for drawPoints() that assumes you want to draw the entire array 780 */ 781 public void drawPoints(float[] pts, Paint paint) { 782 drawPoints(pts, 0, pts.length, paint); 783 } 784 785 /** 786 * Helper for drawPoints() for drawing a single point. 787 */ 788 public native void drawPoint(float x, float y, Paint paint); 789 790 /** 791 * Draw a line segment with the specified start and stop x,y coordinates, 792 * using the specified paint. NOTE: since a line is always "framed", the 793 * Style is ignored in the paint. 794 * 795 * @param startX The x-coordinate of the start point of the line 796 * @param startY The y-coordinate of the start point of the line 797 * @param paint The paint used to draw the line 798 */ 799 public void drawLine(float startX, float startY, float stopX, float stopY, 800 Paint paint) { 801 native_drawLine(mNativeCanvas, startX, startY, stopX, stopY, 802 paint.mNativePaint); 803 } 804 805 /** 806 * Draw a series of lines. Each line is taken from 4 consecutive values 807 * in the pts array. Thus to draw 1 line, the array must contain at least 4 808 * values. This is logically the same as drawing the array as follows: 809 * drawLine(pts[0], pts[1], pts[2], pts[3]) followed by 810 * drawLine(pts[4], pts[5], pts[6], pts[7]) and so on. 811 * 812 * @param pts Array of points to draw [x0 y0 x1 y1 x2 y2 ...] 813 * @param offset Number of values in the array to skip before drawing. 814 * @param count The number of values in the array to process, after 815 * skipping "offset" of them. Since each line uses 4 values, 816 * the number of "lines" that are drawn is really 817 * (count >> 2). 818 * @param paint The paint used to draw the points 819 */ 820 public native void drawLines(float[] pts, int offset, int count, 821 Paint paint); 822 823 public void drawLines(float[] pts, Paint paint) { 824 drawLines(pts, 0, pts.length, paint); 825 } 826 827 /** 828 * Draw the specified Rect using the specified paint. The rectangle will 829 * be filled or framed based on the Style in the paint. 830 * 831 * @param rect The rect to be drawn 832 * @param paint The paint used to draw the rect 833 */ 834 public void drawRect(RectF rect, Paint paint) { 835 native_drawRect(mNativeCanvas, rect, paint.mNativePaint); 836 } 837 838 /** 839 * Draw the specified Rect using the specified Paint. The rectangle 840 * will be filled or framed based on the Style in the paint. 841 * 842 * @param r The rectangle to be drawn. 843 * @param paint The paint used to draw the rectangle 844 */ 845 public void drawRect(Rect r, Paint paint) { 846 drawRect(r.left, r.top, r.right, r.bottom, paint); 847 } 848 849 850 /** 851 * Draw the specified Rect using the specified paint. The rectangle will 852 * be filled or framed based on the Style in the paint. 853 * 854 * @param left The left side of the rectangle to be drawn 855 * @param top The top side of the rectangle to be drawn 856 * @param right The right side of the rectangle to be drawn 857 * @param bottom The bottom side of the rectangle to be drawn 858 * @param paint The paint used to draw the rect 859 */ 860 public void drawRect(float left, float top, float right, float bottom, 861 Paint paint) { 862 native_drawRect(mNativeCanvas, left, top, right, bottom, 863 paint.mNativePaint); 864 } 865 866 /** 867 * Draw the specified oval using the specified paint. The oval will be 868 * filled or framed based on the Style in the paint. 869 * 870 * @param oval The rectangle bounds of the oval to be drawn 871 */ 872 public void drawOval(RectF oval, Paint paint) { 873 if (oval == null) { 874 throw new NullPointerException(); 875 } 876 native_drawOval(mNativeCanvas, oval, paint.mNativePaint); 877 } 878 879 /** 880 * Draw the specified circle using the specified paint. If radius is <= 0, 881 * then nothing will be drawn. The circle will be filled or framed based 882 * on the Style in the paint. 883 * 884 * @param cx The x-coordinate of the center of the cirle to be drawn 885 * @param cy The y-coordinate of the center of the cirle to be drawn 886 * @param radius The radius of the cirle to be drawn 887 * @param paint The paint used to draw the circle 888 */ 889 public void drawCircle(float cx, float cy, float radius, Paint paint) { 890 native_drawCircle(mNativeCanvas, cx, cy, radius, 891 paint.mNativePaint); 892 } 893 894 /** 895 * Draw the specified arc, which will be scaled to fit inside the 896 * specified oval. If the sweep angle is >= 360, then the oval is drawn 897 * completely. Note that this differs slightly from SkPath::arcTo, which 898 * treats the sweep angle mod 360. 899 * 900 * @param oval The bounds of oval used to define the shape and size 901 * of the arc 902 * @param startAngle Starting angle (in degrees) where the arc begins 903 * @param sweepAngle Sweep angle (in degrees) measured clockwise 904 * @param useCenter If true, include the center of the oval in the arc, and 905 close it if it is being stroked. This will draw a wedge 906 * @param paint The paint used to draw the arc 907 */ 908 public void drawArc(RectF oval, float startAngle, float sweepAngle, 909 boolean useCenter, Paint paint) { 910 if (oval == null) { 911 throw new NullPointerException(); 912 } 913 native_drawArc(mNativeCanvas, oval, startAngle, sweepAngle, 914 useCenter, paint.mNativePaint); 915 } 916 917 /** 918 * Draw the specified round-rect using the specified paint. The roundrect 919 * will be filled or framed based on the Style in the paint. 920 * 921 * @param rect The rectangular bounds of the roundRect to be drawn 922 * @param rx The x-radius of the oval used to round the corners 923 * @param ry The y-radius of the oval used to round the corners 924 * @param paint The paint used to draw the roundRect 925 */ 926 public void drawRoundRect(RectF rect, float rx, float ry, Paint paint) { 927 if (rect == null) { 928 throw new NullPointerException(); 929 } 930 native_drawRoundRect(mNativeCanvas, rect, rx, ry, 931 paint.mNativePaint); 932 } 933 934 /** 935 * Draw the specified path using the specified paint. The path will be 936 * filled or framed based on the Style in the paint. 937 * 938 * @param path The path to be drawn 939 * @param paint The paint used to draw the path 940 */ 941 public void drawPath(Path path, Paint paint) { 942 native_drawPath(mNativeCanvas, path.ni(), paint.mNativePaint); 943 } 944 945 private static void throwIfRecycled(Bitmap bitmap) { 946 if (bitmap.isRecycled()) { 947 throw new RuntimeException( 948 "Canvas: trying to use a recycled bitmap " + bitmap); 949 } 950 } 951 952 /** 953 * Draw the specified bitmap, with its top/left corner at (x,y), using 954 * the specified paint, transformed by the current matrix. 955 * 956 * <p>Note: if the paint contains a maskfilter that generates a mask which 957 * extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), 958 * then the bitmap will be drawn as if it were in a Shader with CLAMP mode. 959 * Thus the color outside of the original width/height will be the edge 960 * color replicated. 961 * 962 * <p>If the bitmap and canvas have different densities, this function 963 * will take care of automatically scaling the bitmap to draw at the 964 * same density as the canvas. 965 * 966 * @param bitmap The bitmap to be drawn 967 * @param left The position of the left side of the bitmap being drawn 968 * @param top The position of the top side of the bitmap being drawn 969 * @param paint The paint used to draw the bitmap (may be null) 970 */ 971 public void drawBitmap(Bitmap bitmap, float left, float top, Paint paint) { 972 throwIfRecycled(bitmap); 973 native_drawBitmap(mNativeCanvas, bitmap.ni(), left, top, 974 paint != null ? paint.mNativePaint : 0, mDensity, bitmap.mDensity); 975 } 976 977 /** 978 * Draw the specified bitmap, scaling/translating automatically to fill 979 * the destination rectangle. If the source rectangle is not null, it 980 * specifies the subset of the bitmap to draw. 981 * 982 * <p>Note: if the paint contains a maskfilter that generates a mask which 983 * extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), 984 * then the bitmap will be drawn as if it were in a Shader with CLAMP mode. 985 * Thus the color outside of the original width/height will be the edge 986 * color replicated. 987 * 988 * <p>This function <em>ignores the density associated with the bitmap</em>. 989 * This is because the source and destination rectangle coordinate 990 * spaces are in their respective densities, so must already have the 991 * appropriate scaling factor applied. 992 * 993 * @param bitmap The bitmap to be drawn 994 * @param src May be null. The subset of the bitmap to be drawn 995 * @param dst The rectangle that the bitmap will be scaled/translated 996 * to fit into 997 * @param paint May be null. The paint used to draw the bitmap 998 */ 999 public void drawBitmap(Bitmap bitmap, Rect src, RectF dst, Paint paint) { 1000 if (dst == null) { 1001 throw new NullPointerException(); 1002 } 1003 throwIfRecycled(bitmap); 1004 native_drawBitmap(mNativeCanvas, bitmap.ni(), src, dst, 1005 paint != null ? paint.mNativePaint : 0); 1006 } 1007 1008 /** 1009 * Draw the specified bitmap, scaling/translating automatically to fill 1010 * the destination rectangle. If the source rectangle is not null, it 1011 * specifies the subset of the bitmap to draw. 1012 * 1013 * <p>Note: if the paint contains a maskfilter that generates a mask which 1014 * extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), 1015 * then the bitmap will be drawn as if it were in a Shader with CLAMP mode. 1016 * Thus the color outside of the original width/height will be the edge 1017 * color replicated. 1018 * 1019 * <p>This function <em>ignores the density associated with the bitmap</em>. 1020 * This is because the source and destination rectangle coordinate 1021 * spaces are in their respective densities, so must already have the 1022 * appropriate scaling factor applied. 1023 * 1024 * @param bitmap The bitmap to be drawn 1025 * @param src May be null. The subset of the bitmap to be drawn 1026 * @param dst The rectangle that the bitmap will be scaled/translated 1027 * to fit into 1028 * @param paint May be null. The paint used to draw the bitmap 1029 */ 1030 public void drawBitmap(Bitmap bitmap, Rect src, Rect dst, Paint paint) { 1031 if (dst == null) { 1032 throw new NullPointerException(); 1033 } 1034 throwIfRecycled(bitmap); 1035 native_drawBitmap(mNativeCanvas, bitmap.ni(), src, dst, 1036 paint != null ? paint.mNativePaint : 0); 1037 } 1038 1039 /** 1040 * Treat the specified array of colors as a bitmap, and draw it. This gives 1041 * the same result as first creating a bitmap from the array, and then 1042 * drawing it, but this method avoids explicitly creating a bitmap object 1043 * which can be more efficient if the colors are changing often. 1044 * 1045 * @param colors Array of colors representing the pixels of the bitmap 1046 * @param offset Offset into the array of colors for the first pixel 1047 * @param stride The number of of colors in the array between rows (must be 1048 * >= width or <= -width). 1049 * @param x The X coordinate for where to draw the bitmap 1050 * @param y The Y coordinate for where to draw the bitmap 1051 * @param width The width of the bitmap 1052 * @param height The height of the bitmap 1053 * @param hasAlpha True if the alpha channel of the colors contains valid 1054 * values. If false, the alpha byte is ignored (assumed to 1055 * be 0xFF for every pixel). 1056 * @param paint May be null. The paint used to draw the bitmap 1057 */ 1058 public void drawBitmap(int[] colors, int offset, int stride, float x, 1059 float y, int width, int height, boolean hasAlpha, 1060 Paint paint) { 1061 // check for valid input 1062 if (width < 0) { 1063 throw new IllegalArgumentException("width must be >= 0"); 1064 } 1065 if (height < 0) { 1066 throw new IllegalArgumentException("height must be >= 0"); 1067 } 1068 if (Math.abs(stride) < width) { 1069 throw new IllegalArgumentException("abs(stride) must be >= width"); 1070 } 1071 int lastScanline = offset + (height - 1) * stride; 1072 int length = colors.length; 1073 if (offset < 0 || (offset + width > length) || lastScanline < 0 1074 || (lastScanline + width > length)) { 1075 throw new ArrayIndexOutOfBoundsException(); 1076 } 1077 // quick escape if there's nothing to draw 1078 if (width == 0 || height == 0) { 1079 return; 1080 } 1081 // punch down to native for the actual draw 1082 native_drawBitmap(mNativeCanvas, colors, offset, stride, x, y, width, height, hasAlpha, 1083 paint != null ? paint.mNativePaint : 0); 1084 } 1085 1086 /** Legacy version of drawBitmap(int[] colors, ...) that took ints for x,y 1087 */ 1088 public void drawBitmap(int[] colors, int offset, int stride, int x, int y, 1089 int width, int height, boolean hasAlpha, 1090 Paint paint) { 1091 // call through to the common float version 1092 drawBitmap(colors, offset, stride, (float)x, (float)y, width, height, 1093 hasAlpha, paint); 1094 } 1095 1096 /** 1097 * Draw the bitmap using the specified matrix. 1098 * 1099 * @param bitmap The bitmap to draw 1100 * @param matrix The matrix used to transform the bitmap when it is drawn 1101 * @param paint May be null. The paint used to draw the bitmap 1102 */ 1103 public void drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint) { 1104 nativeDrawBitmapMatrix(mNativeCanvas, bitmap.ni(), matrix.ni(), 1105 paint != null ? paint.mNativePaint : 0); 1106 } 1107 1108 private static void checkRange(int length, int offset, int count) { 1109 if ((offset | count) < 0 || offset + count > length) { 1110 throw new ArrayIndexOutOfBoundsException(); 1111 } 1112 } 1113 1114 /** 1115 * Draw the bitmap through the mesh, where mesh vertices are evenly 1116 * distributed across the bitmap. There are meshWidth+1 vertices across, and 1117 * meshHeight+1 vertices down. The verts array is accessed in row-major 1118 * order, so that the first meshWidth+1 vertices are distributed across the 1119 * top of the bitmap from left to right. A more general version of this 1120 * methid is drawVertices(). 1121 * 1122 * @param bitmap The bitmap to draw using the mesh 1123 * @param meshWidth The number of columns in the mesh. Nothing is drawn if 1124 * this is 0 1125 * @param meshHeight The number of rows in the mesh. Nothing is drawn if 1126 * this is 0 1127 * @param verts Array of x,y pairs, specifying where the mesh should be 1128 * drawn. There must be at least 1129 * (meshWidth+1) * (meshHeight+1) * 2 + meshOffset values 1130 * in the array 1131 * @param vertOffset Number of verts elements to skip before drawing 1132 * @param colors May be null. Specifies a color at each vertex, which is 1133 * interpolated across the cell, and whose values are 1134 * multiplied by the corresponding bitmap colors. If not null, 1135 * there must be at least (meshWidth+1) * (meshHeight+1) + 1136 * colorOffset values in the array. 1137 * @param colorOffset Number of color elements to skip before drawing 1138 * @param paint May be null. The paint used to draw the bitmap 1139 */ 1140 public void drawBitmapMesh(Bitmap bitmap, int meshWidth, int meshHeight, 1141 float[] verts, int vertOffset, 1142 int[] colors, int colorOffset, Paint paint) { 1143 if ((meshWidth | meshHeight | vertOffset | colorOffset) < 0) { 1144 throw new ArrayIndexOutOfBoundsException(); 1145 } 1146 if (meshWidth == 0 || meshHeight == 0) { 1147 return; 1148 } 1149 int count = (meshWidth + 1) * (meshHeight + 1); 1150 // we mul by 2 since we need two floats per vertex 1151 checkRange(verts.length, vertOffset, count * 2); 1152 if (colors != null) { 1153 // no mul by 2, since we need only 1 color per vertex 1154 checkRange(colors.length, colorOffset, count); 1155 } 1156 nativeDrawBitmapMesh(mNativeCanvas, bitmap.ni(), meshWidth, meshHeight, 1157 verts, vertOffset, colors, colorOffset, 1158 paint != null ? paint.mNativePaint : 0); 1159 } 1160 1161 public enum VertexMode { 1162 TRIANGLES(0), 1163 TRIANGLE_STRIP(1), 1164 TRIANGLE_FAN(2); 1165 1166 VertexMode(int nativeInt) { 1167 this.nativeInt = nativeInt; 1168 } 1169 final int nativeInt; 1170 } 1171 1172 /** 1173 * Draw the array of vertices, interpreted as triangles (based on mode). The 1174 * verts array is required, and specifies the x,y pairs for each vertex. If 1175 * texs is non-null, then it is used to specify the coordinate in shader 1176 * coordinates to use at each vertex (the paint must have a shader in this 1177 * case). If there is no texs array, but there is a color array, then each 1178 * color is interpolated across its corresponding triangle in a gradient. If 1179 * both texs and colors arrays are present, then they behave as before, but 1180 * the resulting color at each pixels is the result of multiplying the 1181 * colors from the shader and the color-gradient together. The indices array 1182 * is optional, but if it is present, then it is used to specify the index 1183 * of each triangle, rather than just walking through the arrays in order. 1184 * 1185 * @param mode How to interpret the array of vertices 1186 * @param vertexCount The number of values in the vertices array (and 1187 * corresponding texs and colors arrays if non-null). Each logical 1188 * vertex is two values (x, y), vertexCount must be a multiple of 2. 1189 * @param verts Array of vertices for the mesh 1190 * @param vertOffset Number of values in the verts to skip before drawing. 1191 * @param texs May be null. If not null, specifies the coordinates to sample 1192 * into the current shader (e.g. bitmap tile or gradient) 1193 * @param texOffset Number of values in texs to skip before drawing. 1194 * @param colors May be null. If not null, specifies a color for each 1195 * vertex, to be interpolated across the triangle. 1196 * @param colorOffset Number of values in colors to skip before drawing. 1197 * @param indices If not null, array of indices to reference into the 1198 * vertex (texs, colors) array. 1199 * @param indexCount number of entries in the indices array (if not null). 1200 * @param paint Specifies the shader to use if the texs array is non-null. 1201 */ 1202 public void drawVertices(VertexMode mode, int vertexCount, 1203 float[] verts, int vertOffset, 1204 float[] texs, int texOffset, 1205 int[] colors, int colorOffset, 1206 short[] indices, int indexOffset, 1207 int indexCount, Paint paint) { 1208 checkRange(verts.length, vertOffset, vertexCount); 1209 if (texs != null) { 1210 checkRange(texs.length, texOffset, vertexCount); 1211 } 1212 if (colors != null) { 1213 checkRange(colors.length, colorOffset, vertexCount); 1214 } 1215 if (indices != null) { 1216 checkRange(indices.length, indexOffset, indexCount); 1217 } 1218 nativeDrawVertices(mNativeCanvas, mode.nativeInt, vertexCount, verts, 1219 vertOffset, texs, texOffset, colors, colorOffset, 1220 indices, indexOffset, indexCount, paint.mNativePaint); 1221 } 1222 1223 /** 1224 * Draw the text, with origin at (x,y), using the specified paint. The 1225 * origin is interpreted based on the Align setting in the paint. 1226 * 1227 * @param text The text to be drawn 1228 * @param x The x-coordinate of the origin of the text being drawn 1229 * @param y The y-coordinate of the origin of the text being drawn 1230 * @param paint The paint used for the text (e.g. color, size, style) 1231 */ 1232 public void drawText(char[] text, int index, int count, float x, float y, 1233 Paint paint) { 1234 if ((index | count | (index + count) | 1235 (text.length - index - count)) < 0) { 1236 throw new IndexOutOfBoundsException(); 1237 } 1238 native_drawText(mNativeCanvas, text, index, count, x, y, 1239 paint.mNativePaint); 1240 } 1241 1242 /** 1243 * Draw the text, with origin at (x,y), using the specified paint. The 1244 * origin is interpreted based on the Align setting in the paint. 1245 * 1246 * @param text The text to be drawn 1247 * @param x The x-coordinate of the origin of the text being drawn 1248 * @param y The y-coordinate of the origin of the text being drawn 1249 * @param paint The paint used for the text (e.g. color, size, style) 1250 */ 1251 public native void drawText(String text, float x, float y, Paint paint); 1252 1253 /** 1254 * Draw the text, with origin at (x,y), using the specified paint. 1255 * The origin is interpreted based on the Align setting in the paint. 1256 * 1257 * @param text The text to be drawn 1258 * @param start The index of the first character in text to draw 1259 * @param end (end - 1) is the index of the last character in text to draw 1260 * @param x The x-coordinate of the origin of the text being drawn 1261 * @param y The y-coordinate of the origin of the text being drawn 1262 * @param paint The paint used for the text (e.g. color, size, style) 1263 */ 1264 public void drawText(String text, int start, int end, float x, float y, 1265 Paint paint) { 1266 if ((start | end | (end - start) | (text.length() - end)) < 0) { 1267 throw new IndexOutOfBoundsException(); 1268 } 1269 native_drawText(mNativeCanvas, text, start, end, x, y, 1270 paint.mNativePaint); 1271 } 1272 1273 /** 1274 * Draw the specified range of text, specified by start/end, with its 1275 * origin at (x,y), in the specified Paint. The origin is interpreted 1276 * based on the Align setting in the Paint. 1277 * 1278 * @param text The text to be drawn 1279 * @param start The index of the first character in text to draw 1280 * @param end (end - 1) is the index of the last character in text 1281 * to draw 1282 * @param x The x-coordinate of origin for where to draw the text 1283 * @param y The y-coordinate of origin for where to draw the text 1284 * @param paint The paint used for the text (e.g. color, size, style) 1285 */ 1286 public void drawText(CharSequence text, int start, int end, float x, 1287 float y, Paint paint) { 1288 if (text instanceof String || text instanceof SpannedString || 1289 text instanceof SpannableString) { 1290 native_drawText(mNativeCanvas, text.toString(), start, end, x, y, 1291 paint.mNativePaint); 1292 } 1293 else if (text instanceof GraphicsOperations) { 1294 ((GraphicsOperations) text).drawText(this, start, end, x, y, 1295 paint); 1296 } 1297 else { 1298 char[] buf = TemporaryBuffer.obtain(end - start); 1299 TextUtils.getChars(text, start, end, buf, 0); 1300 drawText(buf, 0, end - start, x, y, paint); 1301 TemporaryBuffer.recycle(buf); 1302 } 1303 } 1304 1305 /** 1306 * Draw the text in the array, with each character's origin specified by 1307 * the pos array. 1308 * 1309 * @param text The text to be drawn 1310 * @param index The index of the first character to draw 1311 * @param count The number of characters to draw, starting from index. 1312 * @param pos Array of [x,y] positions, used to position each 1313 * character 1314 * @param paint The paint used for the text (e.g. color, size, style) 1315 */ 1316 public void drawPosText(char[] text, int index, int count, float[] pos, 1317 Paint paint) { 1318 if (index < 0 || index + count > text.length || count*2 > pos.length) { 1319 throw new IndexOutOfBoundsException(); 1320 } 1321 native_drawPosText(mNativeCanvas, text, index, count, pos, 1322 paint.mNativePaint); 1323 } 1324 1325 /** 1326 * Draw the text in the array, with each character's origin specified by 1327 * the pos array. 1328 * 1329 * @param text The text to be drawn 1330 * @param pos Array of [x,y] positions, used to position each character 1331 * @param paint The paint used for the text (e.g. color, size, style) 1332 */ 1333 public void drawPosText(String text, float[] pos, Paint paint) { 1334 if (text.length()*2 > pos.length) { 1335 throw new ArrayIndexOutOfBoundsException(); 1336 } 1337 native_drawPosText(mNativeCanvas, text, pos, paint.mNativePaint); 1338 } 1339 1340 /** 1341 * Draw the text, with origin at (x,y), using the specified paint, along 1342 * the specified path. The paint's Align setting determins where along the 1343 * path to start the text. 1344 * 1345 * @param text The text to be drawn 1346 * @param path The path the text should follow for its baseline 1347 * @param hOffset The distance along the path to add to the text's 1348 * starting position 1349 * @param vOffset The distance above(-) or below(+) the path to position 1350 * the text 1351 * @param paint The paint used for the text (e.g. color, size, style) 1352 */ 1353 public void drawTextOnPath(char[] text, int index, int count, Path path, 1354 float hOffset, float vOffset, Paint paint) { 1355 if (index < 0 || index + count > text.length) { 1356 throw new ArrayIndexOutOfBoundsException(); 1357 } 1358 native_drawTextOnPath(mNativeCanvas, text, index, count, 1359 path.ni(), hOffset, vOffset, 1360 paint.mNativePaint); 1361 } 1362 1363 /** 1364 * Draw the text, with origin at (x,y), using the specified paint, along 1365 * the specified path. The paint's Align setting determins where along the 1366 * path to start the text. 1367 * 1368 * @param text The text to be drawn 1369 * @param path The path the text should follow for its baseline 1370 * @param hOffset The distance along the path to add to the text's 1371 * starting position 1372 * @param vOffset The distance above(-) or below(+) the path to position 1373 * the text 1374 * @param paint The paint used for the text (e.g. color, size, style) 1375 */ 1376 public void drawTextOnPath(String text, Path path, float hOffset, 1377 float vOffset, Paint paint) { 1378 if (text.length() > 0) { 1379 native_drawTextOnPath(mNativeCanvas, text, path.ni(), 1380 hOffset, vOffset, paint.mNativePaint); 1381 } 1382 } 1383 1384 /** 1385 * Save the canvas state, draw the picture, and restore the canvas state. 1386 * This differs from picture.draw(canvas), which does not perform any 1387 * save/restore. 1388 * 1389 * @param picture The picture to be drawn 1390 */ 1391 public void drawPicture(Picture picture) { 1392 picture.endRecording(); 1393 native_drawPicture(mNativeCanvas, picture.ni()); 1394 } 1395 1396 /** 1397 * Draw the picture, stretched to fit into the dst rectangle. 1398 */ 1399 public void drawPicture(Picture picture, RectF dst) { 1400 save(); 1401 translate(dst.left, dst.top); 1402 if (picture.getWidth() > 0 && picture.getHeight() > 0) { 1403 scale(dst.width() / picture.getWidth(), 1404 dst.height() / picture.getHeight()); 1405 } 1406 drawPicture(picture); 1407 restore(); 1408 } 1409 1410 /** 1411 * Draw the picture, stretched to fit into the dst rectangle. 1412 */ 1413 public void drawPicture(Picture picture, Rect dst) { 1414 save(); 1415 translate(dst.left, dst.top); 1416 if (picture.getWidth() > 0 && picture.getHeight() > 0) { 1417 scale((float)dst.width() / picture.getWidth(), 1418 (float)dst.height() / picture.getHeight()); 1419 } 1420 drawPicture(picture); 1421 restore(); 1422 } 1423 1424 protected void finalize() throws Throwable { 1425 super.finalize(); 1426 // If the constructor threw an exception before setting mNativeCanvas, the native finalizer 1427 // must not be invoked. 1428 if (mNativeCanvas != 0) { 1429 finalizer(mNativeCanvas); 1430 } 1431 } 1432 1433 /** 1434 * Free up as much memory as possible from private caches (e.g. fonts, 1435 * images) 1436 * 1437 * @hide - for now 1438 */ 1439 public static native void freeCaches(); 1440 1441 private static native int initRaster(int nativeBitmapOrZero); 1442 private static native int initGL(); 1443 private static native void native_setBitmap(int nativeCanvas, int bitmap); 1444 private static native void nativeSetViewport(int nCanvas, int w, int h); 1445 private static native int native_saveLayer(int nativeCanvas, RectF bounds, 1446 int paint, int layerFlags); 1447 private static native int native_saveLayer(int nativeCanvas, float l, 1448 float t, float r, float b, 1449 int paint, int layerFlags); 1450 private static native int native_saveLayerAlpha(int nativeCanvas, 1451 RectF bounds, int alpha, 1452 int layerFlags); 1453 private static native int native_saveLayerAlpha(int nativeCanvas, float l, 1454 float t, float r, float b, 1455 int alpha, int layerFlags); 1456 1457 private static native void native_concat(int nCanvas, int nMatrix); 1458 private static native void native_setMatrix(int nCanvas, int nMatrix); 1459 private static native boolean native_clipRect(int nCanvas, 1460 float left, float top, 1461 float right, float bottom, 1462 int regionOp); 1463 private static native boolean native_clipPath(int nativeCanvas, 1464 int nativePath, 1465 int regionOp); 1466 private static native boolean native_clipRegion(int nativeCanvas, 1467 int nativeRegion, 1468 int regionOp); 1469 private static native void nativeSetDrawFilter(int nativeCanvas, 1470 int nativeFilter); 1471 private static native boolean native_getClipBounds(int nativeCanvas, 1472 Rect bounds); 1473 private static native void native_getCTM(int canvas, int matrix); 1474 private static native boolean native_quickReject(int nativeCanvas, 1475 RectF rect, 1476 int native_edgeType); 1477 private static native boolean native_quickReject(int nativeCanvas, 1478 int path, 1479 int native_edgeType); 1480 private static native boolean native_quickReject(int nativeCanvas, 1481 float left, float top, 1482 float right, float bottom, 1483 int native_edgeType); 1484 private static native void native_drawRGB(int nativeCanvas, int r, int g, 1485 int b); 1486 private static native void native_drawARGB(int nativeCanvas, int a, int r, 1487 int g, int b); 1488 private static native void native_drawColor(int nativeCanvas, int color); 1489 private static native void native_drawColor(int nativeCanvas, int color, 1490 int mode); 1491 private static native void native_drawPaint(int nativeCanvas, int paint); 1492 private static native void native_drawLine(int nativeCanvas, float startX, 1493 float startY, float stopX, 1494 float stopY, int paint); 1495 private static native void native_drawRect(int nativeCanvas, RectF rect, 1496 int paint); 1497 private static native void native_drawRect(int nativeCanvas, float left, 1498 float top, float right, 1499 float bottom, int paint); 1500 private static native void native_drawOval(int nativeCanvas, RectF oval, 1501 int paint); 1502 private static native void native_drawCircle(int nativeCanvas, float cx, 1503 float cy, float radius, 1504 int paint); 1505 private static native void native_drawArc(int nativeCanvas, RectF oval, 1506 float startAngle, float sweep, 1507 boolean useCenter, int paint); 1508 private static native void native_drawRoundRect(int nativeCanvas, 1509 RectF rect, float rx, 1510 float ry, int paint); 1511 private static native void native_drawPath(int nativeCanvas, int path, 1512 int paint); 1513 private native void native_drawBitmap(int nativeCanvas, int bitmap, 1514 float left, float top, 1515 int nativePaintOrZero, 1516 int canvasDensity, int bitmapDensity); 1517 private native void native_drawBitmap(int nativeCanvas, int bitmap, 1518 Rect src, RectF dst, 1519 int nativePaintOrZero); 1520 private static native void native_drawBitmap(int nativeCanvas, int bitmap, 1521 Rect src, Rect dst, 1522 int nativePaintOrZero); 1523 private static native void native_drawBitmap(int nativeCanvas, int[] colors, 1524 int offset, int stride, float x, 1525 float y, int width, int height, 1526 boolean hasAlpha, 1527 int nativePaintOrZero); 1528 private static native void nativeDrawBitmapMatrix(int nCanvas, int nBitmap, 1529 int nMatrix, int nPaint); 1530 private static native void nativeDrawBitmapMesh(int nCanvas, int nBitmap, 1531 int meshWidth, int meshHeight, 1532 float[] verts, int vertOffset, 1533 int[] colors, int colorOffset, int nPaint); 1534 private static native void nativeDrawVertices(int nCanvas, int mode, int n, 1535 float[] verts, int vertOffset, float[] texs, int texOffset, 1536 int[] colors, int colorOffset, short[] indices, 1537 int indexOffset, int indexCount, int nPaint); 1538 1539 private static native void native_drawText(int nativeCanvas, char[] text, 1540 int index, int count, float x, 1541 float y, int paint); 1542 private static native void native_drawText(int nativeCanvas, String text, 1543 int start, int end, float x, 1544 float y, int paint); 1545 private static native void native_drawPosText(int nativeCanvas, 1546 char[] text, int index, 1547 int count, float[] pos, 1548 int paint); 1549 private static native void native_drawPosText(int nativeCanvas, 1550 String text, float[] pos, 1551 int paint); 1552 private static native void native_drawTextOnPath(int nativeCanvas, 1553 char[] text, int index, 1554 int count, int path, 1555 float hOffset, 1556 float vOffset, int paint); 1557 private static native void native_drawTextOnPath(int nativeCanvas, 1558 String text, int path, 1559 float hOffset, 1560 float vOffset, int paint); 1561 private static native void native_drawPicture(int nativeCanvas, 1562 int nativePicture); 1563 private static native void finalizer(int nativeCanvas); 1564} 1565