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 to determine when compatibility scaling is in effect. 55 private int mScreenDensity = Bitmap.DENSITY_NONE; 56 57 // Used by native code 58 @SuppressWarnings({"UnusedDeclaration"}) 59 private int mSurfaceFormat; 60 61 /** 62 * Construct an empty raster canvas. Use setBitmap() to specify a bitmap to 63 * draw into. The initial target density is {@link Bitmap#DENSITY_NONE}; 64 * this will typically be replaced when a target bitmap is set for the 65 * canvas. 66 */ 67 public Canvas() { 68 // 0 means no native bitmap 69 mNativeCanvas = initRaster(0); 70 } 71 72 /** 73 * Construct a canvas with the specified bitmap to draw into. The bitmap 74 * must be mutable. 75 * 76 * <p>The initial target density of the canvas is the same as the given 77 * bitmap's density. 78 * 79 * @param bitmap Specifies a mutable bitmap for the canvas to draw into. 80 */ 81 public Canvas(Bitmap bitmap) { 82 if (!bitmap.isMutable()) { 83 throw new IllegalStateException( 84 "Immutable bitmap passed to Canvas constructor"); 85 } 86 throwIfRecycled(bitmap); 87 mNativeCanvas = initRaster(bitmap.ni()); 88 mBitmap = bitmap; 89 mDensity = bitmap.mDensity; 90 } 91 92 /*package*/ Canvas(int nativeCanvas) { 93 if (nativeCanvas == 0) { 94 throw new IllegalStateException(); 95 } 96 mNativeCanvas = nativeCanvas; 97 mDensity = Bitmap.getDefaultDensity(); 98 } 99 100 /** 101 * Construct a canvas with the specified gl context. All drawing through 102 * this canvas will be redirected to OpenGL. Note: some features may not 103 * be supported in this mode (e.g. some GL implementations may not support 104 * antialiasing or certain effects like ColorMatrix or certain Xfermodes). 105 * However, no exception will be thrown in those cases. 106 * 107 * <p>The initial target density of the canvas is the same as the initial 108 * density of bitmaps as per {@link Bitmap#getDensity() Bitmap.getDensity()}. 109 */ 110 public Canvas(GL gl) { 111 mNativeCanvas = initGL(); 112 mGL = gl; 113 mDensity = Bitmap.getDefaultDensity(); 114 } 115 116 /** 117 * Return the GL object associated with this canvas, or null if it is not 118 * backed by GL. 119 */ 120 public GL getGL() { 121 return mGL; 122 } 123 124 /** 125 * Call this to free up OpenGL resources that may be cached or allocated 126 * on behalf of the Canvas. Any subsequent drawing with a GL-backed Canvas 127 * will have to recreate those resources. 128 */ 129 public static void freeGlCaches() { 130 freeCaches(); 131 } 132 133 /** 134 * Specify a bitmap for the canvas to draw into. As a side-effect, also 135 * updates the canvas's target density to match that of the bitmap. 136 * 137 * @param bitmap Specifies a mutable bitmap for the canvas to draw into. 138 * 139 * @see #setDensity(int) 140 * @see #getDensity() 141 */ 142 public void setBitmap(Bitmap bitmap) { 143 if (!bitmap.isMutable()) { 144 throw new IllegalStateException(); 145 } 146 if (mGL != null) { 147 throw new RuntimeException("Can't set a bitmap device on a GL canvas"); 148 } 149 throwIfRecycled(bitmap); 150 151 native_setBitmap(mNativeCanvas, bitmap.ni()); 152 mBitmap = bitmap; 153 mDensity = bitmap.mDensity; 154 } 155 156 /** 157 * Set the viewport dimensions if this canvas is GL based. If it is not, 158 * this method is ignored and no exception is thrown. 159 * 160 * @param width The width of the viewport 161 * @param height The height of the viewport 162 */ 163 public void setViewport(int width, int height) { 164 if (mGL != null) { 165 nativeSetViewport(mNativeCanvas, width, height); 166 } 167 } 168 169 /** 170 * Return true if the device that the current layer draws into is opaque 171 * (i.e. does not support per-pixel alpha). 172 * 173 * @return true if the device that the current layer draws into is opaque 174 */ 175 public native boolean isOpaque(); 176 177 /** 178 * Returns the width of the current drawing layer 179 * 180 * @return the width of the current drawing layer 181 */ 182 public native int getWidth(); 183 184 /** 185 * Returns the height of the current drawing layer 186 * 187 * @return the height of the current drawing layer 188 */ 189 public native int getHeight(); 190 191 /** 192 * <p>Returns the target density of the canvas. The default density is 193 * derived from the density of its backing bitmap, or 194 * {@link Bitmap#DENSITY_NONE} if there is not one.</p> 195 * 196 * @return Returns the current target density of the canvas, which is used 197 * to determine the scaling factor when drawing a bitmap into it. 198 * 199 * @see #setDensity(int) 200 * @see Bitmap#getDensity() 201 */ 202 public int getDensity() { 203 return mDensity; 204 } 205 206 /** 207 * <p>Specifies the density for this Canvas' backing bitmap. This modifies 208 * the target density of the canvas itself, as well as the density of its 209 * backing bitmap via {@link Bitmap#setDensity(int) Bitmap.setDensity(int)}. 210 * 211 * @param density The new target density of the canvas, which is used 212 * to determine the scaling factor when drawing a bitmap into it. Use 213 * {@link Bitmap#DENSITY_NONE} to disable bitmap scaling. 214 * 215 * @see #getDensity() 216 * @see Bitmap#setDensity(int) 217 */ 218 public void setDensity(int density) { 219 if (mBitmap != null) { 220 mBitmap.setDensity(density); 221 } 222 mDensity = density; 223 } 224 225 /** @hide */ 226 public void setScreenDensity(int density) { 227 mScreenDensity = density; 228 } 229 230 // the SAVE_FLAG constants must match their native equivalents 231 232 /** restore the current matrix when restore() is called */ 233 public static final int MATRIX_SAVE_FLAG = 0x01; 234 /** restore the current clip when restore() is called */ 235 public static final int CLIP_SAVE_FLAG = 0x02; 236 /** the layer needs to per-pixel alpha */ 237 public static final int HAS_ALPHA_LAYER_SAVE_FLAG = 0x04; 238 /** the layer needs to 8-bits per color component */ 239 public static final int FULL_COLOR_LAYER_SAVE_FLAG = 0x08; 240 /** clip against the layer's bounds */ 241 public static final int CLIP_TO_LAYER_SAVE_FLAG = 0x10; 242 /** restore everything when restore() is called */ 243 public static final int ALL_SAVE_FLAG = 0x1F; 244 245 /** 246 * Saves the current matrix and clip onto a private stack. Subsequent 247 * calls to translate,scale,rotate,skew,concat or clipRect,clipPath 248 * will all operate as usual, but when the balancing call to restore() 249 * is made, those calls will be forgotten, and the settings that existed 250 * before the save() will be reinstated. 251 * 252 * @return The value to pass to restoreToCount() to balance this save() 253 */ 254 public native int save(); 255 256 /** 257 * Based on saveFlags, can save the current matrix and clip onto a private 258 * stack. Subsequent calls to translate,scale,rotate,skew,concat or 259 * clipRect,clipPath will all operate as usual, but when the balancing 260 * call to restore() is made, those calls will be forgotten, and the 261 * settings that existed before the save() will be reinstated. 262 * 263 * @param saveFlags flag bits that specify which parts of the Canvas state 264 * to save/restore 265 * @return The value to pass to restoreToCount() to balance this save() 266 */ 267 public native int save(int saveFlags); 268 269 /** 270 * This behaves the same as save(), but in addition it allocates an 271 * offscreen bitmap. All drawing calls are directed there, and only when 272 * the balancing call to restore() is made is that offscreen transfered to 273 * the canvas (or the previous layer). Subsequent calls to translate, 274 * scale, rotate, skew, concat or clipRect, clipPath all operate on this 275 * copy. When the balancing call to restore() is made, this copy is 276 * deleted and the previous matrix/clip state is restored. 277 * 278 * @param bounds May be null. The maximum size the offscreen bitmap 279 * needs to be (in local coordinates) 280 * @param paint This is copied, and is applied to the offscreen when 281 * restore() is called. 282 * @param saveFlags see _SAVE_FLAG constants 283 * @return value to pass to restoreToCount() to balance this save() 284 */ 285 public int saveLayer(RectF bounds, Paint paint, int saveFlags) { 286 return native_saveLayer(mNativeCanvas, bounds, 287 paint != null ? paint.mNativePaint : 0, 288 saveFlags); 289 } 290 291 /** 292 * Helper version of saveLayer() that takes 4 values rather than a RectF. 293 */ 294 public int saveLayer(float left, float top, float right, float bottom, 295 Paint paint, int saveFlags) { 296 return native_saveLayer(mNativeCanvas, left, top, right, bottom, 297 paint != null ? paint.mNativePaint : 0, 298 saveFlags); 299 } 300 301 /** 302 * This behaves the same as save(), but in addition it allocates an 303 * offscreen bitmap. All drawing calls are directed there, and only when 304 * the balancing call to restore() is made is that offscreen transfered to 305 * the canvas (or the previous layer). Subsequent calls to translate, 306 * scale, rotate, skew, concat or clipRect, clipPath all operate on this 307 * copy. When the balancing call to restore() is made, this copy is 308 * deleted and the previous matrix/clip state is restored. 309 * 310 * @param bounds The maximum size the offscreen bitmap needs to be 311 * (in local coordinates) 312 * @param alpha The alpha to apply to the offscreen when when it is 313 drawn during restore() 314 * @param saveFlags see _SAVE_FLAG constants 315 * @return value to pass to restoreToCount() to balance this call 316 */ 317 public int saveLayerAlpha(RectF bounds, int alpha, int saveFlags) { 318 alpha = Math.min(255, Math.max(0, alpha)); 319 return native_saveLayerAlpha(mNativeCanvas, bounds, alpha, saveFlags); 320 } 321 322 /** 323 * Helper for saveLayerAlpha() that takes 4 values instead of a RectF. 324 */ 325 public int saveLayerAlpha(float left, float top, float right, float bottom, 326 int alpha, int saveFlags) { 327 return native_saveLayerAlpha(mNativeCanvas, left, top, right, bottom, 328 alpha, saveFlags); 329 } 330 331 /** 332 * This call balances a previous call to save(), and is used to remove all 333 * modifications to the matrix/clip state since the last save call. It is 334 * an error to call restore() more times than save() was called. 335 */ 336 public native void restore(); 337 338 /** 339 * Returns the number of matrix/clip states on the Canvas' private stack. 340 * This will equal # save() calls - # restore() calls. 341 */ 342 public native int getSaveCount(); 343 344 /** 345 * Efficient way to pop any calls to save() that happened after the save 346 * count reached saveCount. It is an error for saveCount to be less than 1. 347 * 348 * Example: 349 * int count = canvas.save(); 350 * ... // more calls potentially to save() 351 * canvas.restoreToCount(count); 352 * // now the canvas is back in the same state it was before the initial 353 * // call to save(). 354 * 355 * @param saveCount The save level to restore to. 356 */ 357 public native void restoreToCount(int saveCount); 358 359 /** 360 * Preconcat the current matrix with the specified translation 361 * 362 * @param dx The distance to translate in X 363 * @param dy The distance to translate in Y 364 */ 365 public native void translate(float dx, float dy); 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 */ 373 public native void scale(float sx, float sy); 374 375 /** 376 * Preconcat the current matrix with the specified scale. 377 * 378 * @param sx The amount to scale in X 379 * @param sy The amount to scale in Y 380 * @param px The x-coord for the pivot point (unchanged by the rotation) 381 * @param py The y-coord for the pivot point (unchanged by the rotation) 382 */ 383 public final void scale(float sx, float sy, float px, float py) { 384 translate(px, py); 385 scale(sx, sy); 386 translate(-px, -py); 387 } 388 389 /** 390 * Preconcat the current matrix with the specified rotation. 391 * 392 * @param degrees The amount to rotate, in degrees 393 */ 394 public native void rotate(float degrees); 395 396 /** 397 * Preconcat the current matrix with the specified rotation. 398 * 399 * @param degrees The amount to rotate, in degrees 400 * @param px The x-coord for the pivot point (unchanged by the rotation) 401 * @param py The y-coord for the pivot point (unchanged by the rotation) 402 */ 403 public final void rotate(float degrees, float px, float py) { 404 translate(px, py); 405 rotate(degrees); 406 translate(-px, -py); 407 } 408 409 /** 410 * Preconcat the current matrix with the specified skew. 411 * 412 * @param sx The amount to skew in X 413 * @param sy The amount to skew in Y 414 */ 415 public native void skew(float sx, float sy); 416 417 /** 418 * Preconcat the current matrix with the specified matrix. 419 * 420 * @param matrix The matrix to preconcatenate with the current matrix 421 */ 422 public void concat(Matrix matrix) { 423 native_concat(mNativeCanvas, matrix.native_instance); 424 } 425 426 /** 427 * Completely replace the current matrix with the specified matrix. If the 428 * matrix parameter is null, then the current matrix is reset to identity. 429 * 430 * @param matrix The matrix to replace the current matrix with. If it is 431 * null, set the current matrix to identity. 432 */ 433 public void setMatrix(Matrix matrix) { 434 native_setMatrix(mNativeCanvas, 435 matrix == null ? 0 : matrix.native_instance); 436 } 437 438 /** 439 * Return, in ctm, the current transformation matrix. This does not alter 440 * the matrix in the canvas, but just returns a copy of it. 441 */ 442 public void getMatrix(Matrix ctm) { 443 native_getCTM(mNativeCanvas, ctm.native_instance); 444 } 445 446 /** 447 * Return a new matrix with a copy of the canvas' current transformation 448 * matrix. 449 */ 450 public final Matrix getMatrix() { 451 Matrix m = new Matrix(); 452 getMatrix(m); 453 return m; 454 } 455 456 /** 457 * Modify the current clip with the specified rectangle. 458 * 459 * @param rect The rect to intersect with the current clip 460 * @param op How the clip is modified 461 * @return true if the resulting clip is non-empty 462 */ 463 public boolean clipRect(RectF rect, Region.Op op) { 464 return native_clipRect(mNativeCanvas, 465 rect.left, rect.top, rect.right, rect.bottom, 466 op.nativeInt); 467 } 468 469 /** 470 * Modify the current clip with the specified rectangle, which is 471 * expressed in local coordinates. 472 * 473 * @param rect The rectangle to intersect with the current clip. 474 * @param op How the clip is modified 475 * @return true if the resulting clip is non-empty 476 */ 477 public boolean clipRect(Rect rect, Region.Op op) { 478 return native_clipRect(mNativeCanvas, 479 rect.left, rect.top, rect.right, rect.bottom, 480 op.nativeInt); 481 } 482 483 /** 484 * Intersect the current clip with the specified rectangle, which is 485 * expressed in local coordinates. 486 * 487 * @param rect The rectangle to intersect with the current clip. 488 * @return true if the resulting clip is non-empty 489 */ 490 public native boolean clipRect(RectF rect); 491 492 /** 493 * Intersect the current clip with the specified rectangle, which is 494 * expressed in local coordinates. 495 * 496 * @param rect The rectangle to intersect with the current clip. 497 * @return true if the resulting clip is non-empty 498 */ 499 public native boolean clipRect(Rect rect); 500 501 /** 502 * Modify the current clip with the specified rectangle, which is 503 * expressed in local coordinates. 504 * 505 * @param left The left side of the rectangle to intersect with the 506 * current clip 507 * @param top The top of the rectangle to intersect with the current 508 * clip 509 * @param right The right side of the rectangle to intersect with the 510 * current clip 511 * @param bottom The bottom of the rectangle to intersect with the current 512 * clip 513 * @param op How the clip is modified 514 * @return true if the resulting clip is non-empty 515 */ 516 public boolean clipRect(float left, float top, float right, float bottom, 517 Region.Op op) { 518 return native_clipRect(mNativeCanvas, left, top, right, bottom, 519 op.nativeInt); 520 } 521 522 /** 523 * Intersect the current clip with the specified rectangle, which is 524 * expressed in local coordinates. 525 * 526 * @param left The left side of the rectangle to intersect with the 527 * current clip 528 * @param top The top of the rectangle to intersect with the current clip 529 * @param right The right side of the rectangle to intersect with the 530 * current clip 531 * @param bottom The bottom of the rectangle to intersect with the current 532 * clip 533 * @return true if the resulting clip is non-empty 534 */ 535 public native boolean clipRect(float left, float top, 536 float right, float bottom); 537 538 /** 539 * Intersect the current clip with the specified rectangle, which is 540 * expressed in local coordinates. 541 * 542 * @param left The left side of the rectangle to intersect with the 543 * current clip 544 * @param top The top of the rectangle to intersect with the current clip 545 * @param right The right side of the rectangle to intersect with the 546 * current clip 547 * @param bottom The bottom of the rectangle to intersect with the current 548 * clip 549 * @return true if the resulting clip is non-empty 550 */ 551 public native boolean clipRect(int left, int top, 552 int right, int bottom); 553 554 /** 555 * Modify the current clip with the specified path. 556 * 557 * @param path The path to operate on the current clip 558 * @param op How the clip is modified 559 * @return true if the resulting is non-empty 560 */ 561 public boolean clipPath(Path path, Region.Op op) { 562 return native_clipPath(mNativeCanvas, path.ni(), op.nativeInt); 563 } 564 565 /** 566 * Intersect the current clip with the specified path. 567 * 568 * @param path The path to intersect with the current clip 569 * @return true if the resulting is non-empty 570 */ 571 public boolean clipPath(Path path) { 572 return clipPath(path, Region.Op.INTERSECT); 573 } 574 575 /** 576 * Modify the current clip with the specified region. Note that unlike 577 * clipRect() and clipPath() which transform their arguments by the 578 * current matrix, clipRegion() assumes its argument is already in the 579 * coordinate system of the current layer's bitmap, and so not 580 * transformation is performed. 581 * 582 * @param region The region to operate on the current clip, based on op 583 * @param op How the clip is modified 584 * @return true if the resulting is non-empty 585 */ 586 public boolean clipRegion(Region region, Region.Op op) { 587 return native_clipRegion(mNativeCanvas, region.ni(), op.nativeInt); 588 } 589 590 /** 591 * Intersect the current clip with the specified region. Note that unlike 592 * clipRect() and clipPath() which transform their arguments by the 593 * current matrix, clipRegion() assumes its argument is already in the 594 * coordinate system of the current layer's bitmap, and so not 595 * transformation is performed. 596 * 597 * @param region The region to operate on the current clip, based on op 598 * @return true if the resulting is non-empty 599 */ 600 public boolean clipRegion(Region region) { 601 return clipRegion(region, Region.Op.INTERSECT); 602 } 603 604 public DrawFilter getDrawFilter() { 605 return mDrawFilter; 606 } 607 608 public void setDrawFilter(DrawFilter filter) { 609 int nativeFilter = 0; 610 if (filter != null) { 611 nativeFilter = filter.mNativeInt; 612 } 613 mDrawFilter = filter; 614 nativeSetDrawFilter(mNativeCanvas, nativeFilter); 615 } 616 617 public enum EdgeType { 618 BW(0), //!< treat edges by just rounding to nearest pixel boundary 619 AA(1); //!< treat edges by rounding-out, since they may be antialiased 620 621 EdgeType(int nativeInt) { 622 this.nativeInt = nativeInt; 623 } 624 final int nativeInt; 625 } 626 627 /** 628 * Return true if the specified rectangle, after being transformed by the 629 * current matrix, would lie completely outside of the current clip. Call 630 * this to check if an area you intend to draw into is clipped out (and 631 * therefore you can skip making the draw calls). 632 * 633 * @param rect the rect to compare with the current clip 634 * @param type specifies how to treat the edges (BW or antialiased) 635 * @return true if the rect (transformed by the canvas' matrix) 636 * does not intersect with the canvas' clip 637 */ 638 public boolean quickReject(RectF rect, EdgeType type) { 639 return native_quickReject(mNativeCanvas, rect, type.nativeInt); 640 } 641 642 /** 643 * Return true if the specified path, after being transformed by the 644 * current matrix, would lie completely outside of the current clip. Call 645 * this to check if an area you intend to draw into is clipped out (and 646 * therefore you can skip making the draw calls). Note: for speed it may 647 * return false even if the path itself might not intersect the clip 648 * (i.e. the bounds of the path intersects, but the path does not). 649 * 650 * @param path The path to compare with the current clip 651 * @param type true if the path should be considered antialiased, 652 * since that means it may 653 * affect a larger area (more pixels) than 654 * non-antialiased. 655 * @return true if the path (transformed by the canvas' matrix) 656 * does not intersect with the canvas' clip 657 */ 658 public boolean quickReject(Path path, EdgeType type) { 659 return native_quickReject(mNativeCanvas, path.ni(), type.nativeInt); 660 } 661 662 /** 663 * Return true if the specified rectangle, after being transformed by the 664 * current matrix, would lie completely outside of the current clip. Call 665 * this to check if an area you intend to draw into is clipped out (and 666 * therefore you can skip making the draw calls). 667 * 668 * @param left The left side of the rectangle to compare with the 669 * current clip 670 * @param top The top of the rectangle to compare with the current 671 * clip 672 * @param right The right side of the rectangle to compare with the 673 * current clip 674 * @param bottom The bottom of the rectangle to compare with the 675 * current clip 676 * @param type true if the rect should be considered antialiased, 677 * since that means it may affect a larger area (more 678 * pixels) than non-antialiased. 679 * @return true if the rect (transformed by the canvas' matrix) 680 * does not intersect with the canvas' clip 681 */ 682 public boolean quickReject(float left, float top, float right, float bottom, 683 EdgeType type) { 684 return native_quickReject(mNativeCanvas, left, top, right, bottom, 685 type.nativeInt); 686 } 687 688 /** 689 * Retrieve the clip bounds, returning true if they are non-empty. 690 * 691 * @param bounds Return the clip bounds here. If it is null, ignore it but 692 * still return true if the current clip is non-empty. 693 * @return true if the current clip is non-empty. 694 */ 695 public boolean getClipBounds(Rect bounds) { 696 return native_getClipBounds(mNativeCanvas, bounds); 697 } 698 699 /** 700 * Retrieve the clip bounds. 701 * 702 * @return the clip bounds, or [0, 0, 0, 0] if the clip is empty. 703 */ 704 public final Rect getClipBounds() { 705 Rect r = new Rect(); 706 getClipBounds(r); 707 return r; 708 } 709 710 /** 711 * Fill the entire canvas' bitmap (restricted to the current clip) with the 712 * specified RGB color, using srcover porterduff mode. 713 * 714 * @param r red component (0..255) of the color to draw onto the canvas 715 * @param g green component (0..255) of the color to draw onto the canvas 716 * @param b blue component (0..255) of the color to draw onto the canvas 717 */ 718 public void drawRGB(int r, int g, int b) { 719 native_drawRGB(mNativeCanvas, r, g, b); 720 } 721 722 /** 723 * Fill the entire canvas' bitmap (restricted to the current clip) with the 724 * specified ARGB color, using srcover porterduff mode. 725 * 726 * @param a alpha component (0..255) of the color to draw onto the canvas 727 * @param r red component (0..255) of the color to draw onto the canvas 728 * @param g green component (0..255) of the color to draw onto the canvas 729 * @param b blue component (0..255) of the color to draw onto the canvas 730 */ 731 public void drawARGB(int a, int r, int g, int b) { 732 native_drawARGB(mNativeCanvas, a, r, g, b); 733 } 734 735 /** 736 * Fill the entire canvas' bitmap (restricted to the current clip) with the 737 * specified color, using srcover porterduff mode. 738 * 739 * @param color the color to draw onto the canvas 740 */ 741 public void drawColor(int color) { 742 native_drawColor(mNativeCanvas, color); 743 } 744 745 /** 746 * Fill the entire canvas' bitmap (restricted to the current clip) with the 747 * specified color and porter-duff xfermode. 748 * 749 * @param color the color to draw with 750 * @param mode the porter-duff mode to apply to the color 751 */ 752 public void drawColor(int color, PorterDuff.Mode mode) { 753 native_drawColor(mNativeCanvas, color, mode.nativeInt); 754 } 755 756 /** 757 * Fill the entire canvas' bitmap (restricted to the current clip) with 758 * the specified paint. This is equivalent (but faster) to drawing an 759 * infinitely large rectangle with the specified paint. 760 * 761 * @param paint The paint used to draw onto the canvas 762 */ 763 public void drawPaint(Paint paint) { 764 native_drawPaint(mNativeCanvas, paint.mNativePaint); 765 } 766 767 /** 768 * Draw a series of points. Each point is centered at the coordinate 769 * specified by pts[], and its diameter is specified by the paint's stroke 770 * width (as transformed by the canvas' CTM), with special treatment for 771 * a stroke width of 0, which always draws exactly 1 pixel (or at most 4 772 * if antialiasing is enabled). The shape of the point is controlled by 773 * the paint's Cap type. The shape is a square, unless the cap type is 774 * Round, in which case the shape is a circle. 775 * 776 * @param pts Array of points to draw [x0 y0 x1 y1 x2 y2 ...] 777 * @param offset Number of values to skip before starting to draw. 778 * @param count The number of values to process, after skipping offset 779 * of them. Since one point uses two values, the number of 780 * "points" that are drawn is really (count >> 1). 781 * @param paint The paint used to draw the points 782 */ 783 public native void drawPoints(float[] pts, int offset, int count, 784 Paint paint); 785 786 /** 787 * Helper for drawPoints() that assumes you want to draw the entire array 788 */ 789 public void drawPoints(float[] pts, Paint paint) { 790 drawPoints(pts, 0, pts.length, paint); 791 } 792 793 /** 794 * Helper for drawPoints() for drawing a single point. 795 */ 796 public native void drawPoint(float x, float y, Paint paint); 797 798 /** 799 * Draw a line segment with the specified start and stop x,y coordinates, 800 * using the specified paint. NOTE: since a line is always "framed", the 801 * Style is ignored in the paint. 802 * 803 * @param startX The x-coordinate of the start point of the line 804 * @param startY The y-coordinate of the start point of the line 805 * @param paint The paint used to draw the line 806 */ 807 public void drawLine(float startX, float startY, float stopX, float stopY, 808 Paint paint) { 809 native_drawLine(mNativeCanvas, startX, startY, stopX, stopY, 810 paint.mNativePaint); 811 } 812 813 /** 814 * Draw a series of lines. Each line is taken from 4 consecutive values 815 * in the pts array. Thus to draw 1 line, the array must contain at least 4 816 * values. This is logically the same as drawing the array as follows: 817 * drawLine(pts[0], pts[1], pts[2], pts[3]) followed by 818 * drawLine(pts[4], pts[5], pts[6], pts[7]) and so on. 819 * 820 * @param pts Array of points to draw [x0 y0 x1 y1 x2 y2 ...] 821 * @param offset Number of values in the array to skip before drawing. 822 * @param count The number of values in the array to process, after 823 * skipping "offset" of them. Since each line uses 4 values, 824 * the number of "lines" that are drawn is really 825 * (count >> 2). 826 * @param paint The paint used to draw the points 827 */ 828 public native void drawLines(float[] pts, int offset, int count, 829 Paint paint); 830 831 public void drawLines(float[] pts, Paint paint) { 832 drawLines(pts, 0, pts.length, paint); 833 } 834 835 /** 836 * Draw the specified Rect using the specified paint. The rectangle will 837 * be filled or framed based on the Style in the paint. 838 * 839 * @param rect The rect to be drawn 840 * @param paint The paint used to draw the rect 841 */ 842 public void drawRect(RectF rect, Paint paint) { 843 native_drawRect(mNativeCanvas, rect, paint.mNativePaint); 844 } 845 846 /** 847 * Draw the specified Rect using the specified Paint. The rectangle 848 * will be filled or framed based on the Style in the paint. 849 * 850 * @param r The rectangle to be drawn. 851 * @param paint The paint used to draw the rectangle 852 */ 853 public void drawRect(Rect r, Paint paint) { 854 drawRect(r.left, r.top, r.right, r.bottom, paint); 855 } 856 857 858 /** 859 * Draw the specified Rect using the specified paint. The rectangle will 860 * be filled or framed based on the Style in the paint. 861 * 862 * @param left The left side of the rectangle to be drawn 863 * @param top The top side of the rectangle to be drawn 864 * @param right The right side of the rectangle to be drawn 865 * @param bottom The bottom side of the rectangle to be drawn 866 * @param paint The paint used to draw the rect 867 */ 868 public void drawRect(float left, float top, float right, float bottom, 869 Paint paint) { 870 native_drawRect(mNativeCanvas, left, top, right, bottom, 871 paint.mNativePaint); 872 } 873 874 /** 875 * Draw the specified oval using the specified paint. The oval will be 876 * filled or framed based on the Style in the paint. 877 * 878 * @param oval The rectangle bounds of the oval to be drawn 879 */ 880 public void drawOval(RectF oval, Paint paint) { 881 if (oval == null) { 882 throw new NullPointerException(); 883 } 884 native_drawOval(mNativeCanvas, oval, paint.mNativePaint); 885 } 886 887 /** 888 * Draw the specified circle using the specified paint. If radius is <= 0, 889 * then nothing will be drawn. The circle will be filled or framed based 890 * on the Style in the paint. 891 * 892 * @param cx The x-coordinate of the center of the cirle to be drawn 893 * @param cy The y-coordinate of the center of the cirle to be drawn 894 * @param radius The radius of the cirle to be drawn 895 * @param paint The paint used to draw the circle 896 */ 897 public void drawCircle(float cx, float cy, float radius, Paint paint) { 898 native_drawCircle(mNativeCanvas, cx, cy, radius, 899 paint.mNativePaint); 900 } 901 902 /** 903 * Draw the specified arc, which will be scaled to fit inside the 904 * specified oval. If the sweep angle is >= 360, then the oval is drawn 905 * completely. Note that this differs slightly from SkPath::arcTo, which 906 * treats the sweep angle mod 360. 907 * 908 * @param oval The bounds of oval used to define the shape and size 909 * of the arc 910 * @param startAngle Starting angle (in degrees) where the arc begins 911 * @param sweepAngle Sweep angle (in degrees) measured clockwise 912 * @param useCenter If true, include the center of the oval in the arc, and 913 close it if it is being stroked. This will draw a wedge 914 * @param paint The paint used to draw the arc 915 */ 916 public void drawArc(RectF oval, float startAngle, float sweepAngle, 917 boolean useCenter, Paint paint) { 918 if (oval == null) { 919 throw new NullPointerException(); 920 } 921 native_drawArc(mNativeCanvas, oval, startAngle, sweepAngle, 922 useCenter, paint.mNativePaint); 923 } 924 925 /** 926 * Draw the specified round-rect using the specified paint. The roundrect 927 * will be filled or framed based on the Style in the paint. 928 * 929 * @param rect The rectangular bounds of the roundRect to be drawn 930 * @param rx The x-radius of the oval used to round the corners 931 * @param ry The y-radius of the oval used to round the corners 932 * @param paint The paint used to draw the roundRect 933 */ 934 public void drawRoundRect(RectF rect, float rx, float ry, Paint paint) { 935 if (rect == null) { 936 throw new NullPointerException(); 937 } 938 native_drawRoundRect(mNativeCanvas, rect, rx, ry, 939 paint.mNativePaint); 940 } 941 942 /** 943 * Draw the specified path using the specified paint. The path will be 944 * filled or framed based on the Style in the paint. 945 * 946 * @param path The path to be drawn 947 * @param paint The paint used to draw the path 948 */ 949 public void drawPath(Path path, Paint paint) { 950 native_drawPath(mNativeCanvas, path.ni(), paint.mNativePaint); 951 } 952 953 private static void throwIfRecycled(Bitmap bitmap) { 954 if (bitmap.isRecycled()) { 955 throw new RuntimeException( 956 "Canvas: trying to use a recycled bitmap " + bitmap); 957 } 958 } 959 960 /** 961 * Draw the specified bitmap, with its top/left corner at (x,y), using 962 * the specified paint, transformed by the current matrix. 963 * 964 * <p>Note: if the paint contains a maskfilter that generates a mask which 965 * extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), 966 * then the bitmap will be drawn as if it were in a Shader with CLAMP mode. 967 * Thus the color outside of the original width/height will be the edge 968 * color replicated. 969 * 970 * <p>If the bitmap and canvas have different densities, this function 971 * will take care of automatically scaling the bitmap to draw at the 972 * same density as the canvas. 973 * 974 * @param bitmap The bitmap to be drawn 975 * @param left The position of the left side of the bitmap being drawn 976 * @param top The position of the top side of the bitmap being drawn 977 * @param paint The paint used to draw the bitmap (may be null) 978 */ 979 public void drawBitmap(Bitmap bitmap, float left, float top, Paint paint) { 980 throwIfRecycled(bitmap); 981 native_drawBitmap(mNativeCanvas, bitmap.ni(), left, top, 982 paint != null ? paint.mNativePaint : 0, mDensity, mScreenDensity, 983 bitmap.mDensity); 984 } 985 986 /** 987 * Draw the specified bitmap, scaling/translating automatically to fill 988 * the destination rectangle. If the source rectangle is not null, it 989 * specifies the subset of the bitmap to draw. 990 * 991 * <p>Note: if the paint contains a maskfilter that generates a mask which 992 * extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), 993 * then the bitmap will be drawn as if it were in a Shader with CLAMP mode. 994 * Thus the color outside of the original width/height will be the edge 995 * color replicated. 996 * 997 * <p>This function <em>ignores the density associated with the bitmap</em>. 998 * This is because the source and destination rectangle coordinate 999 * spaces are in their respective densities, so must already have the 1000 * appropriate scaling factor applied. 1001 * 1002 * @param bitmap The bitmap to be drawn 1003 * @param src May be null. The subset of the bitmap to be drawn 1004 * @param dst The rectangle that the bitmap will be scaled/translated 1005 * to fit into 1006 * @param paint May be null. The paint used to draw the bitmap 1007 */ 1008 public void drawBitmap(Bitmap bitmap, Rect src, RectF dst, Paint paint) { 1009 if (dst == null) { 1010 throw new NullPointerException(); 1011 } 1012 throwIfRecycled(bitmap); 1013 native_drawBitmap(mNativeCanvas, bitmap.ni(), src, dst, 1014 paint != null ? paint.mNativePaint : 0, 1015 mScreenDensity, bitmap.mDensity); 1016 } 1017 1018 /** 1019 * Draw the specified bitmap, scaling/translating automatically to fill 1020 * the destination rectangle. If the source rectangle is not null, it 1021 * specifies the subset of the bitmap to draw. 1022 * 1023 * <p>Note: if the paint contains a maskfilter that generates a mask which 1024 * extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), 1025 * then the bitmap will be drawn as if it were in a Shader with CLAMP mode. 1026 * Thus the color outside of the original width/height will be the edge 1027 * color replicated. 1028 * 1029 * <p>This function <em>ignores the density associated with the bitmap</em>. 1030 * This is because the source and destination rectangle coordinate 1031 * spaces are in their respective densities, so must already have the 1032 * appropriate scaling factor applied. 1033 * 1034 * @param bitmap The bitmap to be drawn 1035 * @param src May be null. The subset of the bitmap to be drawn 1036 * @param dst The rectangle that the bitmap will be scaled/translated 1037 * to fit into 1038 * @param paint May be null. The paint used to draw the bitmap 1039 */ 1040 public void drawBitmap(Bitmap bitmap, Rect src, Rect dst, Paint paint) { 1041 if (dst == null) { 1042 throw new NullPointerException(); 1043 } 1044 throwIfRecycled(bitmap); 1045 native_drawBitmap(mNativeCanvas, bitmap.ni(), src, dst, 1046 paint != null ? paint.mNativePaint : 0, 1047 mScreenDensity, bitmap.mDensity); 1048 } 1049 1050 /** 1051 * Treat the specified array of colors as a bitmap, and draw it. This gives 1052 * the same result as first creating a bitmap from the array, and then 1053 * drawing it, but this method avoids explicitly creating a bitmap object 1054 * which can be more efficient if the colors are changing often. 1055 * 1056 * @param colors Array of colors representing the pixels of the bitmap 1057 * @param offset Offset into the array of colors for the first pixel 1058 * @param stride The number of of colors in the array between rows (must be 1059 * >= width or <= -width). 1060 * @param x The X coordinate for where to draw the bitmap 1061 * @param y The Y coordinate for where to draw the bitmap 1062 * @param width The width of the bitmap 1063 * @param height The height of the bitmap 1064 * @param hasAlpha True if the alpha channel of the colors contains valid 1065 * values. If false, the alpha byte is ignored (assumed to 1066 * be 0xFF for every pixel). 1067 * @param paint May be null. The paint used to draw the bitmap 1068 */ 1069 public void drawBitmap(int[] colors, int offset, int stride, float x, 1070 float y, int width, int height, boolean hasAlpha, 1071 Paint paint) { 1072 // check for valid input 1073 if (width < 0) { 1074 throw new IllegalArgumentException("width must be >= 0"); 1075 } 1076 if (height < 0) { 1077 throw new IllegalArgumentException("height must be >= 0"); 1078 } 1079 if (Math.abs(stride) < width) { 1080 throw new IllegalArgumentException("abs(stride) must be >= width"); 1081 } 1082 int lastScanline = offset + (height - 1) * stride; 1083 int length = colors.length; 1084 if (offset < 0 || (offset + width > length) || lastScanline < 0 1085 || (lastScanline + width > length)) { 1086 throw new ArrayIndexOutOfBoundsException(); 1087 } 1088 // quick escape if there's nothing to draw 1089 if (width == 0 || height == 0) { 1090 return; 1091 } 1092 // punch down to native for the actual draw 1093 native_drawBitmap(mNativeCanvas, colors, offset, stride, x, y, width, height, hasAlpha, 1094 paint != null ? paint.mNativePaint : 0); 1095 } 1096 1097 /** Legacy version of drawBitmap(int[] colors, ...) that took ints for x,y 1098 */ 1099 public void drawBitmap(int[] colors, int offset, int stride, int x, int y, 1100 int width, int height, boolean hasAlpha, 1101 Paint paint) { 1102 // call through to the common float version 1103 drawBitmap(colors, offset, stride, (float)x, (float)y, width, height, 1104 hasAlpha, paint); 1105 } 1106 1107 /** 1108 * Draw the bitmap using the specified matrix. 1109 * 1110 * @param bitmap The bitmap to draw 1111 * @param matrix The matrix used to transform the bitmap when it is drawn 1112 * @param paint May be null. The paint used to draw the bitmap 1113 */ 1114 public void drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint) { 1115 nativeDrawBitmapMatrix(mNativeCanvas, bitmap.ni(), matrix.ni(), 1116 paint != null ? paint.mNativePaint : 0); 1117 } 1118 1119 private static void checkRange(int length, int offset, int count) { 1120 if ((offset | count) < 0 || offset + count > length) { 1121 throw new ArrayIndexOutOfBoundsException(); 1122 } 1123 } 1124 1125 /** 1126 * Draw the bitmap through the mesh, where mesh vertices are evenly 1127 * distributed across the bitmap. There are meshWidth+1 vertices across, and 1128 * meshHeight+1 vertices down. The verts array is accessed in row-major 1129 * order, so that the first meshWidth+1 vertices are distributed across the 1130 * top of the bitmap from left to right. A more general version of this 1131 * methid is drawVertices(). 1132 * 1133 * @param bitmap The bitmap to draw using the mesh 1134 * @param meshWidth The number of columns in the mesh. Nothing is drawn if 1135 * this is 0 1136 * @param meshHeight The number of rows in the mesh. Nothing is drawn if 1137 * this is 0 1138 * @param verts Array of x,y pairs, specifying where the mesh should be 1139 * drawn. There must be at least 1140 * (meshWidth+1) * (meshHeight+1) * 2 + meshOffset values 1141 * in the array 1142 * @param vertOffset Number of verts elements to skip before drawing 1143 * @param colors May be null. Specifies a color at each vertex, which is 1144 * interpolated across the cell, and whose values are 1145 * multiplied by the corresponding bitmap colors. If not null, 1146 * there must be at least (meshWidth+1) * (meshHeight+1) + 1147 * colorOffset values in the array. 1148 * @param colorOffset Number of color elements to skip before drawing 1149 * @param paint May be null. The paint used to draw the bitmap 1150 */ 1151 public void drawBitmapMesh(Bitmap bitmap, int meshWidth, int meshHeight, 1152 float[] verts, int vertOffset, 1153 int[] colors, int colorOffset, Paint paint) { 1154 if ((meshWidth | meshHeight | vertOffset | colorOffset) < 0) { 1155 throw new ArrayIndexOutOfBoundsException(); 1156 } 1157 if (meshWidth == 0 || meshHeight == 0) { 1158 return; 1159 } 1160 int count = (meshWidth + 1) * (meshHeight + 1); 1161 // we mul by 2 since we need two floats per vertex 1162 checkRange(verts.length, vertOffset, count * 2); 1163 if (colors != null) { 1164 // no mul by 2, since we need only 1 color per vertex 1165 checkRange(colors.length, colorOffset, count); 1166 } 1167 nativeDrawBitmapMesh(mNativeCanvas, bitmap.ni(), meshWidth, meshHeight, 1168 verts, vertOffset, colors, colorOffset, 1169 paint != null ? paint.mNativePaint : 0); 1170 } 1171 1172 public enum VertexMode { 1173 TRIANGLES(0), 1174 TRIANGLE_STRIP(1), 1175 TRIANGLE_FAN(2); 1176 1177 VertexMode(int nativeInt) { 1178 this.nativeInt = nativeInt; 1179 } 1180 final int nativeInt; 1181 } 1182 1183 /** 1184 * Draw the array of vertices, interpreted as triangles (based on mode). The 1185 * verts array is required, and specifies the x,y pairs for each vertex. If 1186 * texs is non-null, then it is used to specify the coordinate in shader 1187 * coordinates to use at each vertex (the paint must have a shader in this 1188 * case). If there is no texs array, but there is a color array, then each 1189 * color is interpolated across its corresponding triangle in a gradient. If 1190 * both texs and colors arrays are present, then they behave as before, but 1191 * the resulting color at each pixels is the result of multiplying the 1192 * colors from the shader and the color-gradient together. The indices array 1193 * is optional, but if it is present, then it is used to specify the index 1194 * of each triangle, rather than just walking through the arrays in order. 1195 * 1196 * @param mode How to interpret the array of vertices 1197 * @param vertexCount The number of values in the vertices array (and 1198 * corresponding texs and colors arrays if non-null). Each logical 1199 * vertex is two values (x, y), vertexCount must be a multiple of 2. 1200 * @param verts Array of vertices for the mesh 1201 * @param vertOffset Number of values in the verts to skip before drawing. 1202 * @param texs May be null. If not null, specifies the coordinates to sample 1203 * into the current shader (e.g. bitmap tile or gradient) 1204 * @param texOffset Number of values in texs to skip before drawing. 1205 * @param colors May be null. If not null, specifies a color for each 1206 * vertex, to be interpolated across the triangle. 1207 * @param colorOffset Number of values in colors to skip before drawing. 1208 * @param indices If not null, array of indices to reference into the 1209 * vertex (texs, colors) array. 1210 * @param indexCount number of entries in the indices array (if not null). 1211 * @param paint Specifies the shader to use if the texs array is non-null. 1212 */ 1213 public void drawVertices(VertexMode mode, int vertexCount, 1214 float[] verts, int vertOffset, 1215 float[] texs, int texOffset, 1216 int[] colors, int colorOffset, 1217 short[] indices, int indexOffset, 1218 int indexCount, Paint paint) { 1219 checkRange(verts.length, vertOffset, vertexCount); 1220 if (texs != null) { 1221 checkRange(texs.length, texOffset, vertexCount); 1222 } 1223 if (colors != null) { 1224 checkRange(colors.length, colorOffset, vertexCount); 1225 } 1226 if (indices != null) { 1227 checkRange(indices.length, indexOffset, indexCount); 1228 } 1229 nativeDrawVertices(mNativeCanvas, mode.nativeInt, vertexCount, verts, 1230 vertOffset, texs, texOffset, colors, colorOffset, 1231 indices, indexOffset, indexCount, paint.mNativePaint); 1232 } 1233 1234 /** 1235 * Draw the text, with origin at (x,y), using the specified paint. The 1236 * origin is interpreted based on the Align setting in the paint. 1237 * 1238 * @param text The text to be drawn 1239 * @param x The x-coordinate of the origin of the text being drawn 1240 * @param y The y-coordinate of the origin of the text being drawn 1241 * @param paint The paint used for the text (e.g. color, size, style) 1242 */ 1243 public void drawText(char[] text, int index, int count, float x, float y, 1244 Paint paint) { 1245 if ((index | count | (index + count) | 1246 (text.length - index - count)) < 0) { 1247 throw new IndexOutOfBoundsException(); 1248 } 1249 native_drawText(mNativeCanvas, text, index, count, x, y, 1250 paint.mNativePaint); 1251 } 1252 1253 /** 1254 * Draw the text, with origin at (x,y), using the specified paint. The 1255 * origin is interpreted based on the Align setting in the paint. 1256 * 1257 * @param text The text to be drawn 1258 * @param x The x-coordinate of the origin of the text being drawn 1259 * @param y The y-coordinate of the origin of the text being drawn 1260 * @param paint The paint used for the text (e.g. color, size, style) 1261 */ 1262 public native void drawText(String text, float x, float y, Paint paint); 1263 1264 /** 1265 * Draw the text, with origin at (x,y), using the specified paint. 1266 * The origin is interpreted based on the Align setting in the paint. 1267 * 1268 * @param text The text to be drawn 1269 * @param start The index of the first character in text to draw 1270 * @param end (end - 1) is the index of the last character in text to draw 1271 * @param x The x-coordinate of the origin of the text being drawn 1272 * @param y The y-coordinate of the origin of the text being drawn 1273 * @param paint The paint used for the text (e.g. color, size, style) 1274 */ 1275 public void drawText(String text, int start, int end, float x, float y, 1276 Paint paint) { 1277 if ((start | end | (end - start) | (text.length() - end)) < 0) { 1278 throw new IndexOutOfBoundsException(); 1279 } 1280 native_drawText(mNativeCanvas, text, start, end, x, y, 1281 paint.mNativePaint); 1282 } 1283 1284 /** 1285 * Draw the specified range of text, specified by start/end, with its 1286 * origin at (x,y), in the specified Paint. The origin is interpreted 1287 * based on the Align setting in the Paint. 1288 * 1289 * @param text The text to be drawn 1290 * @param start The index of the first character in text to draw 1291 * @param end (end - 1) is the index of the last character in text 1292 * to draw 1293 * @param x The x-coordinate of origin for where to draw the text 1294 * @param y The y-coordinate of origin for where to draw the text 1295 * @param paint The paint used for the text (e.g. color, size, style) 1296 */ 1297 public void drawText(CharSequence text, int start, int end, float x, 1298 float y, Paint paint) { 1299 if (text instanceof String || text instanceof SpannedString || 1300 text instanceof SpannableString) { 1301 native_drawText(mNativeCanvas, text.toString(), start, end, x, y, 1302 paint.mNativePaint); 1303 } 1304 else if (text instanceof GraphicsOperations) { 1305 ((GraphicsOperations) text).drawText(this, start, end, x, y, 1306 paint); 1307 } 1308 else { 1309 char[] buf = TemporaryBuffer.obtain(end - start); 1310 TextUtils.getChars(text, start, end, buf, 0); 1311 drawText(buf, 0, end - start, x, y, paint); 1312 TemporaryBuffer.recycle(buf); 1313 } 1314 } 1315 1316 /** 1317 * Draw the text in the array, with each character's origin specified by 1318 * the pos array. 1319 * 1320 * @param text The text to be drawn 1321 * @param index The index of the first character to draw 1322 * @param count The number of characters to draw, starting from index. 1323 * @param pos Array of [x,y] positions, used to position each 1324 * character 1325 * @param paint The paint used for the text (e.g. color, size, style) 1326 */ 1327 public void drawPosText(char[] text, int index, int count, float[] pos, 1328 Paint paint) { 1329 if (index < 0 || index + count > text.length || count*2 > pos.length) { 1330 throw new IndexOutOfBoundsException(); 1331 } 1332 native_drawPosText(mNativeCanvas, text, index, count, pos, 1333 paint.mNativePaint); 1334 } 1335 1336 /** 1337 * Draw the text in the array, with each character's origin specified by 1338 * the pos array. 1339 * 1340 * @param text The text to be drawn 1341 * @param pos Array of [x,y] positions, used to position each character 1342 * @param paint The paint used for the text (e.g. color, size, style) 1343 */ 1344 public void drawPosText(String text, float[] pos, Paint paint) { 1345 if (text.length()*2 > pos.length) { 1346 throw new ArrayIndexOutOfBoundsException(); 1347 } 1348 native_drawPosText(mNativeCanvas, text, pos, paint.mNativePaint); 1349 } 1350 1351 /** 1352 * Draw the text, with origin at (x,y), using the specified paint, along 1353 * the specified path. The paint's Align setting determins where along the 1354 * path to start the text. 1355 * 1356 * @param text The text to be drawn 1357 * @param path The path the text should follow for its baseline 1358 * @param hOffset The distance along the path to add to the text's 1359 * starting position 1360 * @param vOffset The distance above(-) or below(+) the path to position 1361 * the text 1362 * @param paint The paint used for the text (e.g. color, size, style) 1363 */ 1364 public void drawTextOnPath(char[] text, int index, int count, Path path, 1365 float hOffset, float vOffset, Paint paint) { 1366 if (index < 0 || index + count > text.length) { 1367 throw new ArrayIndexOutOfBoundsException(); 1368 } 1369 native_drawTextOnPath(mNativeCanvas, text, index, count, 1370 path.ni(), hOffset, vOffset, 1371 paint.mNativePaint); 1372 } 1373 1374 /** 1375 * Draw the text, with origin at (x,y), using the specified paint, along 1376 * the specified path. The paint's Align setting determins where along the 1377 * path to start the text. 1378 * 1379 * @param text The text to be drawn 1380 * @param path The path the text should follow for its baseline 1381 * @param hOffset The distance along the path to add to the text's 1382 * starting position 1383 * @param vOffset The distance above(-) or below(+) the path to position 1384 * the text 1385 * @param paint The paint used for the text (e.g. color, size, style) 1386 */ 1387 public void drawTextOnPath(String text, Path path, float hOffset, 1388 float vOffset, Paint paint) { 1389 if (text.length() > 0) { 1390 native_drawTextOnPath(mNativeCanvas, text, path.ni(), 1391 hOffset, vOffset, paint.mNativePaint); 1392 } 1393 } 1394 1395 /** 1396 * Save the canvas state, draw the picture, and restore the canvas state. 1397 * This differs from picture.draw(canvas), which does not perform any 1398 * save/restore. 1399 * 1400 * @param picture The picture to be drawn 1401 */ 1402 public void drawPicture(Picture picture) { 1403 picture.endRecording(); 1404 native_drawPicture(mNativeCanvas, picture.ni()); 1405 } 1406 1407 /** 1408 * Draw the picture, stretched to fit into the dst rectangle. 1409 */ 1410 public void drawPicture(Picture picture, RectF dst) { 1411 save(); 1412 translate(dst.left, dst.top); 1413 if (picture.getWidth() > 0 && picture.getHeight() > 0) { 1414 scale(dst.width() / picture.getWidth(), 1415 dst.height() / picture.getHeight()); 1416 } 1417 drawPicture(picture); 1418 restore(); 1419 } 1420 1421 /** 1422 * Draw the picture, stretched to fit into the dst rectangle. 1423 */ 1424 public void drawPicture(Picture picture, Rect dst) { 1425 save(); 1426 translate(dst.left, dst.top); 1427 if (picture.getWidth() > 0 && picture.getHeight() > 0) { 1428 scale((float)dst.width() / picture.getWidth(), 1429 (float)dst.height() / picture.getHeight()); 1430 } 1431 drawPicture(picture); 1432 restore(); 1433 } 1434 1435 protected void finalize() throws Throwable { 1436 super.finalize(); 1437 // If the constructor threw an exception before setting mNativeCanvas, the native finalizer 1438 // must not be invoked. 1439 if (mNativeCanvas != 0) { 1440 finalizer(mNativeCanvas); 1441 } 1442 } 1443 1444 /** 1445 * Free up as much memory as possible from private caches (e.g. fonts, 1446 * images) 1447 * 1448 * @hide - for now 1449 */ 1450 public static native void freeCaches(); 1451 1452 private static native int initRaster(int nativeBitmapOrZero); 1453 private static native int initGL(); 1454 private static native void native_setBitmap(int nativeCanvas, int bitmap); 1455 private static native void nativeSetViewport(int nCanvas, int w, int h); 1456 private static native int native_saveLayer(int nativeCanvas, RectF bounds, 1457 int paint, int layerFlags); 1458 private static native int native_saveLayer(int nativeCanvas, float l, 1459 float t, float r, float b, 1460 int paint, int layerFlags); 1461 private static native int native_saveLayerAlpha(int nativeCanvas, 1462 RectF bounds, int alpha, 1463 int layerFlags); 1464 private static native int native_saveLayerAlpha(int nativeCanvas, float l, 1465 float t, float r, float b, 1466 int alpha, int layerFlags); 1467 1468 private static native void native_concat(int nCanvas, int nMatrix); 1469 private static native void native_setMatrix(int nCanvas, int nMatrix); 1470 private static native boolean native_clipRect(int nCanvas, 1471 float left, float top, 1472 float right, float bottom, 1473 int regionOp); 1474 private static native boolean native_clipPath(int nativeCanvas, 1475 int nativePath, 1476 int regionOp); 1477 private static native boolean native_clipRegion(int nativeCanvas, 1478 int nativeRegion, 1479 int regionOp); 1480 private static native void nativeSetDrawFilter(int nativeCanvas, 1481 int nativeFilter); 1482 private static native boolean native_getClipBounds(int nativeCanvas, 1483 Rect bounds); 1484 private static native void native_getCTM(int canvas, int matrix); 1485 private static native boolean native_quickReject(int nativeCanvas, 1486 RectF rect, 1487 int native_edgeType); 1488 private static native boolean native_quickReject(int nativeCanvas, 1489 int path, 1490 int native_edgeType); 1491 private static native boolean native_quickReject(int nativeCanvas, 1492 float left, float top, 1493 float right, float bottom, 1494 int native_edgeType); 1495 private static native void native_drawRGB(int nativeCanvas, int r, int g, 1496 int b); 1497 private static native void native_drawARGB(int nativeCanvas, int a, int r, 1498 int g, int b); 1499 private static native void native_drawColor(int nativeCanvas, int color); 1500 private static native void native_drawColor(int nativeCanvas, int color, 1501 int mode); 1502 private static native void native_drawPaint(int nativeCanvas, int paint); 1503 private static native void native_drawLine(int nativeCanvas, float startX, 1504 float startY, float stopX, 1505 float stopY, int paint); 1506 private static native void native_drawRect(int nativeCanvas, RectF rect, 1507 int paint); 1508 private static native void native_drawRect(int nativeCanvas, float left, 1509 float top, float right, 1510 float bottom, int paint); 1511 private static native void native_drawOval(int nativeCanvas, RectF oval, 1512 int paint); 1513 private static native void native_drawCircle(int nativeCanvas, float cx, 1514 float cy, float radius, 1515 int paint); 1516 private static native void native_drawArc(int nativeCanvas, RectF oval, 1517 float startAngle, float sweep, 1518 boolean useCenter, int paint); 1519 private static native void native_drawRoundRect(int nativeCanvas, 1520 RectF rect, float rx, 1521 float ry, int paint); 1522 private static native void native_drawPath(int nativeCanvas, int path, 1523 int paint); 1524 private native void native_drawBitmap(int nativeCanvas, int bitmap, 1525 float left, float top, 1526 int nativePaintOrZero, 1527 int canvasDensity, 1528 int screenDensity, 1529 int bitmapDensity); 1530 private native void native_drawBitmap(int nativeCanvas, int bitmap, 1531 Rect src, RectF dst, 1532 int nativePaintOrZero, 1533 int screenDensity, 1534 int bitmapDensity); 1535 private static native void native_drawBitmap(int nativeCanvas, int bitmap, 1536 Rect src, Rect dst, 1537 int nativePaintOrZero, 1538 int screenDensity, 1539 int bitmapDensity); 1540 private static native void native_drawBitmap(int nativeCanvas, int[] colors, 1541 int offset, int stride, float x, 1542 float y, int width, int height, 1543 boolean hasAlpha, 1544 int nativePaintOrZero); 1545 private static native void nativeDrawBitmapMatrix(int nCanvas, int nBitmap, 1546 int nMatrix, int nPaint); 1547 private static native void nativeDrawBitmapMesh(int nCanvas, int nBitmap, 1548 int meshWidth, int meshHeight, 1549 float[] verts, int vertOffset, 1550 int[] colors, int colorOffset, int nPaint); 1551 private static native void nativeDrawVertices(int nCanvas, int mode, int n, 1552 float[] verts, int vertOffset, float[] texs, int texOffset, 1553 int[] colors, int colorOffset, short[] indices, 1554 int indexOffset, int indexCount, int nPaint); 1555 1556 private static native void native_drawText(int nativeCanvas, char[] text, 1557 int index, int count, float x, 1558 float y, int paint); 1559 private static native void native_drawText(int nativeCanvas, String text, 1560 int start, int end, float x, 1561 float y, int paint); 1562 private static native void native_drawPosText(int nativeCanvas, 1563 char[] text, int index, 1564 int count, float[] pos, 1565 int paint); 1566 private static native void native_drawPosText(int nativeCanvas, 1567 String text, float[] pos, 1568 int paint); 1569 private static native void native_drawTextOnPath(int nativeCanvas, 1570 char[] text, int index, 1571 int count, int path, 1572 float hOffset, 1573 float vOffset, int paint); 1574 private static native void native_drawTextOnPath(int nativeCanvas, 1575 String text, int path, 1576 float hOffset, 1577 float vOffset, int paint); 1578 private static native void native_drawPicture(int nativeCanvas, 1579 int nativePicture); 1580 private static native void finalizer(int nativeCanvas); 1581} 1582