SkDraw.cpp revision 7b4531f64cbd85d32a77ceab1bdec8335c5a7864
1 2/* 3 * Copyright 2006 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10#include "SkDraw.h" 11#include "SkBlitter.h" 12#include "SkBounder.h" 13#include "SkCanvas.h" 14#include "SkColorPriv.h" 15#include "SkDevice.h" 16#include "SkFixed.h" 17#include "SkMaskFilter.h" 18#include "SkPaint.h" 19#include "SkPathEffect.h" 20#include "SkRasterClip.h" 21#include "SkRasterizer.h" 22#include "SkScan.h" 23#include "SkShader.h" 24#include "SkStroke.h" 25#include "SkTemplatesPriv.h" 26#include "SkTLazy.h" 27#include "SkUtils.h" 28 29#include "SkAutoKern.h" 30#include "SkBitmapProcShader.h" 31#include "SkDrawProcs.h" 32 33//#define TRACE_BITMAP_DRAWS 34 35#define kBlitterStorageLongCount (sizeof(SkBitmapProcShader) >> 2) 36 37/** Helper for allocating small blitters on the stack. 38 */ 39class SkAutoBlitterChoose : SkNoncopyable { 40public: 41 SkAutoBlitterChoose() { 42 fBlitter = NULL; 43 } 44 SkAutoBlitterChoose(const SkBitmap& device, const SkMatrix& matrix, 45 const SkPaint& paint) { 46 fBlitter = SkBlitter::Choose(device, matrix, paint, 47 fStorage, sizeof(fStorage)); 48 } 49 50 ~SkAutoBlitterChoose(); 51 52 SkBlitter* operator->() { return fBlitter; } 53 SkBlitter* get() const { return fBlitter; } 54 55 void choose(const SkBitmap& device, const SkMatrix& matrix, 56 const SkPaint& paint) { 57 SkASSERT(!fBlitter); 58 fBlitter = SkBlitter::Choose(device, matrix, paint, 59 fStorage, sizeof(fStorage)); 60 } 61 62private: 63 SkBlitter* fBlitter; 64 uint32_t fStorage[kBlitterStorageLongCount]; 65}; 66 67SkAutoBlitterChoose::~SkAutoBlitterChoose() { 68 if ((void*)fBlitter == (void*)fStorage) { 69 fBlitter->~SkBlitter(); 70 } else { 71 SkDELETE(fBlitter); 72 } 73} 74 75/** 76 * Since we are providing the storage for the shader (to avoid the perf cost 77 * of calling new) we insist that in our destructor we can account for all 78 * owners of the shader. 79 */ 80class SkAutoBitmapShaderInstall : SkNoncopyable { 81public: 82 SkAutoBitmapShaderInstall(const SkBitmap& src, const SkPaint& paint) 83 : fPaint(paint) /* makes a copy of the paint */ { 84 fPaint.setShader(SkShader::CreateBitmapShader(src, 85 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, 86 fStorage, sizeof(fStorage))); 87 // we deliberately left the shader with an owner-count of 2 88 SkASSERT(2 == fPaint.getShader()->getRefCnt()); 89 } 90 91 ~SkAutoBitmapShaderInstall() { 92 SkShader* shader = fPaint.getShader(); 93 // since we manually destroy shader, we insist that owners == 2 94 SkASSERT(2 == shader->getRefCnt()); 95 96 fPaint.setShader(NULL); // unref the shader by 1 97 98 // now destroy to take care of the 2nd owner-count 99 if ((void*)shader == (void*)fStorage) { 100 shader->~SkShader(); 101 } else { 102 SkDELETE(shader); 103 } 104 } 105 106 // return the new paint that has the shader applied 107 const SkPaint& paintWithShader() const { return fPaint; } 108 109private: 110 SkPaint fPaint; // copy of caller's paint (which we then modify) 111 uint32_t fStorage[kBlitterStorageLongCount]; 112}; 113 114/////////////////////////////////////////////////////////////////////////////// 115 116SkDraw::SkDraw() { 117 sk_bzero(this, sizeof(*this)); 118} 119 120SkDraw::SkDraw(const SkDraw& src) { 121 memcpy(this, &src, sizeof(*this)); 122} 123 124/////////////////////////////////////////////////////////////////////////////// 125 126typedef void (*BitmapXferProc)(void* pixels, size_t bytes, uint32_t data); 127 128static void D_Clear_BitmapXferProc(void* pixels, size_t bytes, uint32_t) { 129 sk_bzero(pixels, bytes); 130} 131 132static void D_Dst_BitmapXferProc(void*, size_t, uint32_t data) {} 133 134static void D32_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) { 135 sk_memset32((uint32_t*)pixels, data, bytes >> 2); 136} 137 138static void D16_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) { 139 sk_memset16((uint16_t*)pixels, data, bytes >> 1); 140} 141 142static void DA8_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) { 143 memset(pixels, data, bytes); 144} 145 146static BitmapXferProc ChooseBitmapXferProc(const SkBitmap& bitmap, 147 const SkPaint& paint, 148 uint32_t* data) { 149 // todo: we can apply colorfilter up front if no shader, so we wouldn't 150 // need to abort this fastpath 151 if (paint.getShader() || paint.getColorFilter()) { 152 return NULL; 153 } 154 155 SkXfermode::Mode mode; 156 if (!SkXfermode::AsMode(paint.getXfermode(), &mode)) { 157 return NULL; 158 } 159 160 SkColor color = paint.getColor(); 161 162 // collaps modes based on color... 163 if (SkXfermode::kSrcOver_Mode == mode) { 164 unsigned alpha = SkColorGetA(color); 165 if (0 == alpha) { 166 mode = SkXfermode::kDst_Mode; 167 } else if (0xFF == alpha) { 168 mode = SkXfermode::kSrc_Mode; 169 } 170 } 171 172 switch (mode) { 173 case SkXfermode::kClear_Mode: 174// SkDebugf("--- D_Clear_BitmapXferProc\n"); 175 return D_Clear_BitmapXferProc; // ignore data 176 case SkXfermode::kDst_Mode: 177// SkDebugf("--- D_Dst_BitmapXferProc\n"); 178 return D_Dst_BitmapXferProc; // ignore data 179 case SkXfermode::kSrc_Mode: { 180 /* 181 should I worry about dithering for the lower depths? 182 */ 183 SkPMColor pmc = SkPreMultiplyColor(color); 184 switch (bitmap.config()) { 185 case SkBitmap::kARGB_8888_Config: 186 if (data) { 187 *data = pmc; 188 } 189// SkDebugf("--- D32_Src_BitmapXferProc\n"); 190 return D32_Src_BitmapXferProc; 191 case SkBitmap::kARGB_4444_Config: 192 if (data) { 193 *data = SkPixel32ToPixel4444(pmc); 194 } 195// SkDebugf("--- D16_Src_BitmapXferProc\n"); 196 return D16_Src_BitmapXferProc; 197 case SkBitmap::kRGB_565_Config: 198 if (data) { 199 *data = SkPixel32ToPixel16(pmc); 200 } 201// SkDebugf("--- D16_Src_BitmapXferProc\n"); 202 return D16_Src_BitmapXferProc; 203 case SkBitmap::kA8_Config: 204 if (data) { 205 *data = SkGetPackedA32(pmc); 206 } 207// SkDebugf("--- DA8_Src_BitmapXferProc\n"); 208 return DA8_Src_BitmapXferProc; 209 default: 210 break; 211 } 212 break; 213 } 214 default: 215 break; 216 } 217 return NULL; 218} 219 220static void CallBitmapXferProc(const SkBitmap& bitmap, const SkIRect& rect, 221 BitmapXferProc proc, uint32_t procData) { 222 int shiftPerPixel; 223 switch (bitmap.config()) { 224 case SkBitmap::kARGB_8888_Config: 225 shiftPerPixel = 2; 226 break; 227 case SkBitmap::kARGB_4444_Config: 228 case SkBitmap::kRGB_565_Config: 229 shiftPerPixel = 1; 230 break; 231 case SkBitmap::kA8_Config: 232 shiftPerPixel = 0; 233 break; 234 default: 235 SkDEBUGFAIL("Can't use xferproc on this config"); 236 return; 237 } 238 239 uint8_t* pixels = (uint8_t*)bitmap.getPixels(); 240 SkASSERT(pixels); 241 const size_t rowBytes = bitmap.rowBytes(); 242 const int widthBytes = rect.width() << shiftPerPixel; 243 244 // skip down to the first scanline and X position 245 pixels += rect.fTop * rowBytes + (rect.fLeft << shiftPerPixel); 246 for (int scans = rect.height() - 1; scans >= 0; --scans) { 247 proc(pixels, widthBytes, procData); 248 pixels += rowBytes; 249 } 250} 251 252void SkDraw::drawPaint(const SkPaint& paint) const { 253 SkDEBUGCODE(this->validate();) 254 255 if (fRC->isEmpty()) { 256 return; 257 } 258 259 SkIRect devRect; 260 devRect.set(0, 0, fBitmap->width(), fBitmap->height()); 261 if (fBounder && !fBounder->doIRect(devRect)) { 262 return; 263 } 264 265 if (fRC->isBW()) { 266 /* If we don't have a shader (i.e. we're just a solid color) we may 267 be faster to operate directly on the device bitmap, rather than invoking 268 a blitter. Esp. true for xfermodes, which require a colorshader to be 269 present, which is just redundant work. Since we're drawing everywhere 270 in the clip, we don't have to worry about antialiasing. 271 */ 272 uint32_t procData = 0; // to avoid the warning 273 BitmapXferProc proc = ChooseBitmapXferProc(*fBitmap, paint, &procData); 274 if (proc) { 275 if (D_Dst_BitmapXferProc == proc) { // nothing to do 276 return; 277 } 278 279 SkRegion::Iterator iter(fRC->bwRgn()); 280 while (!iter.done()) { 281 CallBitmapXferProc(*fBitmap, iter.rect(), proc, procData); 282 iter.next(); 283 } 284 return; 285 } 286 } 287 288 // normal case: use a blitter 289 SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, paint); 290 SkScan::FillIRect(devRect, *fRC, blitter.get()); 291} 292 293/////////////////////////////////////////////////////////////////////////////// 294 295struct PtProcRec { 296 SkCanvas::PointMode fMode; 297 const SkPaint* fPaint; 298 const SkRegion* fClip; 299 const SkRasterClip* fRC; 300 301 // computed values 302 SkFixed fRadius; 303 304 typedef void (*Proc)(const PtProcRec&, const SkPoint devPts[], int count, 305 SkBlitter*); 306 307 bool init(SkCanvas::PointMode, const SkPaint&, const SkMatrix* matrix, 308 const SkRasterClip*); 309 Proc chooseProc(SkBlitter** blitter); 310 311private: 312 SkAAClipBlitterWrapper fWrapper; 313}; 314 315static void bw_pt_rect_hair_proc(const PtProcRec& rec, const SkPoint devPts[], 316 int count, SkBlitter* blitter) { 317 SkASSERT(rec.fClip->isRect()); 318 const SkIRect& r = rec.fClip->getBounds(); 319 320 for (int i = 0; i < count; i++) { 321 int x = SkScalarFloor(devPts[i].fX); 322 int y = SkScalarFloor(devPts[i].fY); 323 if (r.contains(x, y)) { 324 blitter->blitH(x, y, 1); 325 } 326 } 327} 328 329static void bw_pt_rect_16_hair_proc(const PtProcRec& rec, 330 const SkPoint devPts[], int count, 331 SkBlitter* blitter) { 332 SkASSERT(rec.fRC->isRect()); 333 const SkIRect& r = rec.fRC->getBounds(); 334 uint32_t value; 335 const SkBitmap* bitmap = blitter->justAnOpaqueColor(&value); 336 SkASSERT(bitmap); 337 338 uint16_t* addr = bitmap->getAddr16(0, 0); 339 int rb = bitmap->rowBytes(); 340 341 for (int i = 0; i < count; i++) { 342 int x = SkScalarFloor(devPts[i].fX); 343 int y = SkScalarFloor(devPts[i].fY); 344 if (r.contains(x, y)) { 345// *bitmap->getAddr16(x, y) = SkToU16(value); 346 ((uint16_t*)((char*)addr + y * rb))[x] = SkToU16(value); 347 } 348 } 349} 350 351static void bw_pt_hair_proc(const PtProcRec& rec, const SkPoint devPts[], 352 int count, SkBlitter* blitter) { 353 for (int i = 0; i < count; i++) { 354 int x = SkScalarFloor(devPts[i].fX); 355 int y = SkScalarFloor(devPts[i].fY); 356 if (rec.fClip->contains(x, y)) { 357 blitter->blitH(x, y, 1); 358 } 359 } 360} 361 362static void bw_line_hair_proc(const PtProcRec& rec, const SkPoint devPts[], 363 int count, SkBlitter* blitter) { 364 for (int i = 0; i < count; i += 2) { 365 SkScan::HairLine(devPts[i], devPts[i+1], *rec.fRC, blitter); 366 } 367} 368 369static void bw_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[], 370 int count, SkBlitter* blitter) { 371 for (int i = 0; i < count - 1; i++) { 372 SkScan::HairLine(devPts[i], devPts[i+1], *rec.fRC, blitter); 373 } 374} 375 376// aa versions 377 378static void aa_line_hair_proc(const PtProcRec& rec, const SkPoint devPts[], 379 int count, SkBlitter* blitter) { 380 for (int i = 0; i < count; i += 2) { 381 SkScan::AntiHairLine(devPts[i], devPts[i+1], *rec.fRC, blitter); 382 } 383} 384 385static void aa_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[], 386 int count, SkBlitter* blitter) { 387 for (int i = 0; i < count - 1; i++) { 388 SkScan::AntiHairLine(devPts[i], devPts[i+1], *rec.fRC, blitter); 389 } 390} 391 392// square procs (strokeWidth > 0 but matrix is square-scale (sx == sy) 393 394static void bw_square_proc(const PtProcRec& rec, const SkPoint devPts[], 395 int count, SkBlitter* blitter) { 396 const SkFixed radius = rec.fRadius; 397 for (int i = 0; i < count; i++) { 398 SkFixed x = SkScalarToFixed(devPts[i].fX); 399 SkFixed y = SkScalarToFixed(devPts[i].fY); 400 401 SkXRect r; 402 r.fLeft = x - radius; 403 r.fTop = y - radius; 404 r.fRight = x + radius; 405 r.fBottom = y + radius; 406 407 SkScan::FillXRect(r, *rec.fRC, blitter); 408 } 409} 410 411static void aa_square_proc(const PtProcRec& rec, const SkPoint devPts[], 412 int count, SkBlitter* blitter) { 413 const SkFixed radius = rec.fRadius; 414 for (int i = 0; i < count; i++) { 415 SkFixed x = SkScalarToFixed(devPts[i].fX); 416 SkFixed y = SkScalarToFixed(devPts[i].fY); 417 418 SkXRect r; 419 r.fLeft = x - radius; 420 r.fTop = y - radius; 421 r.fRight = x + radius; 422 r.fBottom = y + radius; 423 424 SkScan::AntiFillXRect(r, *rec.fRC, blitter); 425 } 426} 427 428// If this guy returns true, then chooseProc() must return a valid proc 429bool PtProcRec::init(SkCanvas::PointMode mode, const SkPaint& paint, 430 const SkMatrix* matrix, const SkRasterClip* rc) { 431 if (paint.getPathEffect()) { 432 return false; 433 } 434 SkScalar width = paint.getStrokeWidth(); 435 if (0 == width) { 436 fMode = mode; 437 fPaint = &paint; 438 fClip = NULL; 439 fRC = rc; 440 fRadius = SK_Fixed1 >> 1; 441 return true; 442 } 443 if (paint.getStrokeCap() != SkPaint::kRound_Cap && 444 matrix->rectStaysRect() && SkCanvas::kPoints_PointMode == mode) { 445 SkScalar sx = matrix->get(SkMatrix::kMScaleX); 446 SkScalar sy = matrix->get(SkMatrix::kMScaleY); 447 if (SkScalarNearlyZero(sx - sy)) { 448 if (sx < 0) { 449 sx = -sx; 450 } 451 452 fMode = mode; 453 fPaint = &paint; 454 fClip = NULL; 455 fRC = rc; 456 fRadius = SkScalarToFixed(SkScalarMul(width, sx)) >> 1; 457 return true; 458 } 459 } 460 return false; 461} 462 463PtProcRec::Proc PtProcRec::chooseProc(SkBlitter** blitterPtr) { 464 Proc proc = NULL; 465 466 SkBlitter* blitter = *blitterPtr; 467 if (fRC->isBW()) { 468 fClip = &fRC->bwRgn(); 469 } else { 470 fWrapper.init(*fRC, blitter); 471 fClip = &fWrapper.getRgn(); 472 blitter = fWrapper.getBlitter(); 473 *blitterPtr = blitter; 474 } 475 476 // for our arrays 477 SkASSERT(0 == SkCanvas::kPoints_PointMode); 478 SkASSERT(1 == SkCanvas::kLines_PointMode); 479 SkASSERT(2 == SkCanvas::kPolygon_PointMode); 480 SkASSERT((unsigned)fMode <= (unsigned)SkCanvas::kPolygon_PointMode); 481 482 // first check for hairlines 483 if (0 == fPaint->getStrokeWidth()) { 484 if (fPaint->isAntiAlias()) { 485 static const Proc gAAProcs[] = { 486 aa_square_proc, aa_line_hair_proc, aa_poly_hair_proc 487 }; 488 proc = gAAProcs[fMode]; 489 } else { 490 if (SkCanvas::kPoints_PointMode == fMode && fClip->isRect()) { 491 uint32_t value; 492 const SkBitmap* bm = blitter->justAnOpaqueColor(&value); 493 if (bm && bm->config() == SkBitmap::kRGB_565_Config) { 494 proc = bw_pt_rect_16_hair_proc; 495 } else { 496 proc = bw_pt_rect_hair_proc; 497 } 498 } else { 499 static Proc gBWProcs[] = { 500 bw_pt_hair_proc, bw_line_hair_proc, bw_poly_hair_proc 501 }; 502 proc = gBWProcs[fMode]; 503 } 504 } 505 } else if (fPaint->getStrokeCap() != SkPaint::kRound_Cap) { 506 SkASSERT(SkCanvas::kPoints_PointMode == fMode); 507 if (fPaint->isAntiAlias()) { 508 proc = aa_square_proc; 509 } else { 510 proc = bw_square_proc; 511 } 512 } 513 return proc; 514} 515 516static bool bounder_points(SkBounder* bounder, SkCanvas::PointMode mode, 517 size_t count, const SkPoint pts[], 518 const SkPaint& paint, const SkMatrix& matrix) { 519 SkIRect ibounds; 520 SkRect bounds; 521 SkScalar inset = paint.getStrokeWidth(); 522 523 bounds.set(pts, count); 524 bounds.inset(-inset, -inset); 525 matrix.mapRect(&bounds); 526 527 bounds.roundOut(&ibounds); 528 return bounder->doIRect(ibounds); 529} 530 531// each of these costs 8-bytes of stack space, so don't make it too large 532// must be even for lines/polygon to work 533#define MAX_DEV_PTS 32 534 535void SkDraw::drawPoints(SkCanvas::PointMode mode, size_t count, 536 const SkPoint pts[], const SkPaint& paint, 537 bool forceUseDevice) const { 538 // if we're in lines mode, force count to be even 539 if (SkCanvas::kLines_PointMode == mode) { 540 count &= ~(size_t)1; 541 } 542 543 if ((long)count <= 0) { 544 return; 545 } 546 547 SkASSERT(pts != NULL); 548 SkDEBUGCODE(this->validate();) 549 550 // nothing to draw 551 if (fRC->isEmpty()) { 552 return; 553 } 554 555 if (fBounder) { 556 if (!bounder_points(fBounder, mode, count, pts, paint, *fMatrix)) { 557 return; 558 } 559 560 // clear the bounder and call this again, so we don't invoke the bounder 561 // later if we happen to call ourselves for drawRect, drawPath, etc. 562 SkDraw noBounder(*this); 563 noBounder.fBounder = NULL; 564 noBounder.drawPoints(mode, count, pts, paint, forceUseDevice); 565 return; 566 } 567 568 PtProcRec rec; 569 if (!forceUseDevice && rec.init(mode, paint, fMatrix, fRC)) { 570 SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, paint); 571 572 SkPoint devPts[MAX_DEV_PTS]; 573 const SkMatrix* matrix = fMatrix; 574 SkBlitter* bltr = blitter.get(); 575 PtProcRec::Proc proc = rec.chooseProc(&bltr); 576 // we have to back up subsequent passes if we're in polygon mode 577 const size_t backup = (SkCanvas::kPolygon_PointMode == mode); 578 579 do { 580 size_t n = count; 581 if (n > MAX_DEV_PTS) { 582 n = MAX_DEV_PTS; 583 } 584 matrix->mapPoints(devPts, pts, n); 585 proc(rec, devPts, n, bltr); 586 pts += n - backup; 587 SkASSERT(count >= n); 588 count -= n; 589 if (count > 0) { 590 count += backup; 591 } 592 } while (count != 0); 593 } else { 594 switch (mode) { 595 case SkCanvas::kPoints_PointMode: { 596 // temporarily mark the paint as filling. 597 SkPaint newPaint(paint); 598 newPaint.setStyle(SkPaint::kFill_Style); 599 600 SkScalar width = newPaint.getStrokeWidth(); 601 SkScalar radius = SkScalarHalf(width); 602 603 if (newPaint.getStrokeCap() == SkPaint::kRound_Cap) { 604 SkPath path; 605 SkMatrix preMatrix; 606 607 path.addCircle(0, 0, radius); 608 for (size_t i = 0; i < count; i++) { 609 preMatrix.setTranslate(pts[i].fX, pts[i].fY); 610 // pass true for the last point, since we can modify 611 // then path then 612 if (fDevice) { 613 fDevice->drawPath(*this, path, newPaint, &preMatrix, 614 (count-1) == i); 615 } else { 616 this->drawPath(path, newPaint, &preMatrix, 617 (count-1) == i); 618 } 619 } 620 } else { 621 SkRect r; 622 623 for (size_t i = 0; i < count; i++) { 624 r.fLeft = pts[i].fX - radius; 625 r.fTop = pts[i].fY - radius; 626 r.fRight = r.fLeft + width; 627 r.fBottom = r.fTop + width; 628 if (fDevice) { 629 fDevice->drawRect(*this, r, newPaint); 630 } else { 631 this->drawRect(r, newPaint); 632 } 633 } 634 } 635 break; 636 } 637 case SkCanvas::kLines_PointMode: 638 case SkCanvas::kPolygon_PointMode: { 639 count -= 1; 640 SkPath path; 641 SkPaint p(paint); 642 p.setStyle(SkPaint::kStroke_Style); 643 size_t inc = (SkCanvas::kLines_PointMode == mode) ? 2 : 1; 644 for (size_t i = 0; i < count; i += inc) { 645 path.moveTo(pts[i]); 646 path.lineTo(pts[i+1]); 647 if (fDevice) { 648 fDevice->drawPath(*this, path, p, NULL, true); 649 } else { 650 this->drawPath(path, p, NULL, true); 651 } 652 path.rewind(); 653 } 654 break; 655 } 656 } 657 } 658} 659 660static inline SkPoint* as_lefttop(SkRect* r) { 661 return (SkPoint*)(void*)r; 662} 663 664static inline SkPoint* as_rightbottom(SkRect* r) { 665 return ((SkPoint*)(void*)r) + 1; 666} 667 668static bool easy_rect_join(const SkPaint& paint, const SkMatrix& matrix, 669 SkPoint* strokeSize) { 670 if (SkPaint::kMiter_Join != paint.getStrokeJoin() || 671 paint.getStrokeMiter() < SK_ScalarSqrt2) { 672 return false; 673 } 674 675 SkASSERT(matrix.rectStaysRect()); 676 SkPoint pt = { paint.getStrokeWidth(), paint.getStrokeWidth() }; 677 matrix.mapVectors(strokeSize, &pt, 1); 678 strokeSize->fX = SkScalarAbs(strokeSize->fX); 679 strokeSize->fY = SkScalarAbs(strokeSize->fY); 680 return true; 681} 682 683SkDraw::RectType SkDraw::ComputeRectType(const SkPaint& paint, 684 const SkMatrix& matrix, 685 SkPoint* strokeSize) { 686 RectType rtype; 687 const SkScalar width = paint.getStrokeWidth(); 688 const bool zeroWidth = (0 == width); 689 SkPaint::Style style = paint.getStyle(); 690 691 if ((SkPaint::kStrokeAndFill_Style == style) && zeroWidth) { 692 style = SkPaint::kFill_Style; 693 } 694 695 if (paint.getPathEffect() || paint.getMaskFilter() || 696 paint.getRasterizer() || !matrix.rectStaysRect() || 697 SkPaint::kStrokeAndFill_Style == style) { 698 rtype = kPath_RectType; 699 } else if (SkPaint::kFill_Style == style) { 700 rtype = kFill_RectType; 701 } else if (zeroWidth) { 702 rtype = kHair_RectType; 703 } else if (easy_rect_join(paint, matrix, strokeSize)) { 704 rtype = kStroke_RectType; 705 } else { 706 rtype = kPath_RectType; 707 } 708 return rtype; 709} 710 711static const SkPoint* rect_points(const SkRect& r) { 712 return (const SkPoint*)(void*)&r; 713} 714 715static SkPoint* rect_points(SkRect& r) { 716 return (SkPoint*)(void*)&r; 717} 718 719void SkDraw::drawRect(const SkRect& rect, const SkPaint& paint) const { 720 SkDEBUGCODE(this->validate();) 721 722 // nothing to draw 723 if (fRC->isEmpty()) { 724 return; 725 } 726 727 SkPoint strokeSize; 728 RectType rtype = ComputeRectType(paint, *fMatrix, &strokeSize); 729 730#ifdef SK_DISABLE_FAST_AA_STROKE_RECT 731 if (kStroke_RectType == rtype && paint.isAntiAlias()) { 732 rtype = kPath_RectType; 733 } 734#endif 735 736 if (kPath_RectType == rtype) { 737 SkPath tmp; 738 tmp.addRect(rect); 739 tmp.setFillType(SkPath::kWinding_FillType); 740 this->drawPath(tmp, paint, NULL, true); 741 return; 742 } 743 744 const SkMatrix& matrix = *fMatrix; 745 SkRect devRect; 746 747 // transform rect into devRect 748 matrix.mapPoints(rect_points(devRect), rect_points(rect), 2); 749 devRect.sort(); 750 751 if (fBounder && !fBounder->doRect(devRect, paint)) { 752 return; 753 } 754 755 // look for the quick exit, before we build a blitter 756 if (true) { 757 SkIRect ir; 758 devRect.roundOut(&ir); 759 if (paint.getStyle() != SkPaint::kFill_Style) { 760 // extra space for hairlines 761 ir.inset(-1, -1); 762 } 763 if (fRC->quickReject(ir)) 764 return; 765 } 766 767 SkAutoBlitterChoose blitterStorage(*fBitmap, matrix, paint); 768 const SkRasterClip& clip = *fRC; 769 SkBlitter* blitter = blitterStorage.get(); 770 771 // we want to "fill" if we are kFill or kStrokeAndFill, since in the latter 772 // case we are also hairline (if we've gotten to here), which devolves to 773 // effectively just kFill 774 switch (rtype) { 775 case kFill_RectType: 776 if (paint.isAntiAlias()) { 777 SkScan::AntiFillRect(devRect, clip, blitter); 778 } else { 779 SkScan::FillRect(devRect, clip, blitter); 780 } 781 break; 782 case kStroke_RectType: 783 if (paint.isAntiAlias()) { 784 SkScan::AntiFrameRect(devRect, strokeSize, clip, blitter); 785 } else { 786 SkScan::FrameRect(devRect, strokeSize, clip, blitter); 787 } 788 break; 789 case kHair_RectType: 790 if (paint.isAntiAlias()) { 791 SkScan::AntiHairRect(devRect, clip, blitter); 792 } else { 793 SkScan::HairRect(devRect, clip, blitter); 794 } 795 break; 796 default: 797 SkDEBUGFAIL("bad rtype"); 798 } 799} 800 801void SkDraw::drawDevMask(const SkMask& srcM, const SkPaint& paint) const { 802 if (srcM.fBounds.isEmpty()) { 803 return; 804 } 805 806 const SkMask* mask = &srcM; 807 808 SkMask dstM; 809 if (paint.getMaskFilter() && 810 paint.getMaskFilter()->filterMask(&dstM, srcM, *fMatrix, NULL)) { 811 mask = &dstM; 812 } else { 813 dstM.fImage = NULL; 814 } 815 SkAutoMaskFreeImage ami(dstM.fImage); 816 817 if (fBounder && !fBounder->doIRect(mask->fBounds)) { 818 return; 819 } 820 821 SkAutoBlitterChoose blitterChooser(*fBitmap, *fMatrix, paint); 822 SkBlitter* blitter = blitterChooser.get(); 823 824 SkAAClipBlitterWrapper wrapper; 825 const SkRegion* clipRgn; 826 827 if (fRC->isBW()) { 828 clipRgn = &fRC->bwRgn(); 829 } else { 830 wrapper.init(*fRC, blitter); 831 clipRgn = &wrapper.getRgn(); 832 blitter = wrapper.getBlitter(); 833 } 834 blitter->blitMaskRegion(*mask, *clipRgn); 835} 836 837static SkScalar fast_len(const SkVector& vec) { 838 SkScalar x = SkScalarAbs(vec.fX); 839 SkScalar y = SkScalarAbs(vec.fY); 840 if (x < y) { 841 SkTSwap(x, y); 842 } 843 return x + SkScalarHalf(y); 844} 845 846static bool xfermodeSupportsCoverageAsAlpha(SkXfermode* xfer) { 847 SkXfermode::Coeff dc; 848 if (!SkXfermode::AsCoeff(xfer, NULL, &dc)) { 849 return false; 850 } 851 852 switch (dc) { 853 case SkXfermode::kOne_Coeff: 854 case SkXfermode::kISA_Coeff: 855 case SkXfermode::kISC_Coeff: 856 return true; 857 default: 858 return false; 859 } 860} 861 862bool SkDrawTreatAsHairline(const SkPaint& paint, const SkMatrix& matrix, 863 SkScalar* coverage) { 864 SkASSERT(coverage); 865 if (SkPaint::kStroke_Style != paint.getStyle()) { 866 return false; 867 } 868 SkScalar strokeWidth = paint.getStrokeWidth(); 869 if (0 == strokeWidth) { 870 *coverage = SK_Scalar1; 871 return true; 872 } 873 874 // if we get here, we need to try to fake a thick-stroke with a modulated 875 // hairline 876 877 if (!paint.isAntiAlias()) { 878 return false; 879 } 880 if (matrix.hasPerspective()) { 881 return false; 882 } 883 884 SkVector src[2], dst[2]; 885 src[0].set(strokeWidth, 0); 886 src[1].set(0, strokeWidth); 887 matrix.mapVectors(dst, src, 2); 888 SkScalar len0 = fast_len(dst[0]); 889 SkScalar len1 = fast_len(dst[1]); 890 if (len0 <= SK_Scalar1 && len1 <= SK_Scalar1) { 891 *coverage = SkScalarAve(len0, len1); 892 return true; 893 } 894 return false; 895} 896 897void SkDraw::drawPath(const SkPath& origSrcPath, const SkPaint& origPaint, 898 const SkMatrix* prePathMatrix, bool pathIsMutable) const { 899 SkDEBUGCODE(this->validate();) 900 901 // nothing to draw 902 if (fRC->isEmpty()) { 903 return; 904 } 905 906 SkPath* pathPtr = (SkPath*)&origSrcPath; 907 bool doFill = true; 908 SkPath tmpPath; 909 SkMatrix tmpMatrix; 910 const SkMatrix* matrix = fMatrix; 911 912 if (prePathMatrix) { 913 if (origPaint.getPathEffect() || origPaint.getStyle() != SkPaint::kFill_Style || 914 origPaint.getRasterizer()) { 915 SkPath* result = pathPtr; 916 917 if (!pathIsMutable) { 918 result = &tmpPath; 919 pathIsMutable = true; 920 } 921 pathPtr->transform(*prePathMatrix, result); 922 pathPtr = result; 923 } else { 924 if (!tmpMatrix.setConcat(*matrix, *prePathMatrix)) { 925 // overflow 926 return; 927 } 928 matrix = &tmpMatrix; 929 } 930 } 931 // at this point we're done with prePathMatrix 932 SkDEBUGCODE(prePathMatrix = (const SkMatrix*)0x50FF8001;) 933 934 const SkPaint* paint = &origPaint; 935 SkTLazy<SkPaint> lazyPaint; 936 937 { 938 SkScalar coverage; 939 if (SkDrawTreatAsHairline(origPaint, *matrix, &coverage)) { 940 if (SK_Scalar1 == coverage) { 941 lazyPaint.set(origPaint); 942 lazyPaint.get()->setStrokeWidth(0); 943 paint = lazyPaint.get(); 944 } else if (xfermodeSupportsCoverageAsAlpha(origPaint.getXfermode())) { 945 U8CPU newAlpha; 946#if 0 947 newAlpha = SkToU8(SkScalarRoundToInt(coverage * 948 origPaint.getAlpha())); 949#else 950 // this is the old technique, which we preserve for now so 951 // we don't change previous results (testing) 952 // the new way seems fine, its just (a tiny bit) different 953 int scale = (int)SkScalarMul(coverage, 256); 954 newAlpha = origPaint.getAlpha() * scale >> 8; 955#endif 956 lazyPaint.set(origPaint); 957 lazyPaint.get()->setStrokeWidth(0); 958 lazyPaint.get()->setAlpha(newAlpha); 959 paint = lazyPaint.get(); 960 } 961 } 962 } 963 964 if (paint->getPathEffect() || paint->getStyle() != SkPaint::kFill_Style) { 965 doFill = paint->getFillPath(*pathPtr, &tmpPath); 966 pathPtr = &tmpPath; 967 } 968 969 if (paint->getRasterizer()) { 970 SkMask mask; 971 if (paint->getRasterizer()->rasterize(*pathPtr, *matrix, 972 &fRC->getBounds(), paint->getMaskFilter(), &mask, 973 SkMask::kComputeBoundsAndRenderImage_CreateMode)) { 974 this->drawDevMask(mask, *paint); 975 SkMask::FreeImage(mask.fImage); 976 } 977 return; 978 } 979 980 // avoid possibly allocating a new path in transform if we can 981 SkPath* devPathPtr = pathIsMutable ? pathPtr : &tmpPath; 982 983 // transform the path into device space 984 pathPtr->transform(*matrix, devPathPtr); 985 986 SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, *paint); 987 988 if (paint->getMaskFilter()) { 989 SkPaint::Style style = doFill ? SkPaint::kFill_Style : 990 SkPaint::kStroke_Style; 991 if (paint->getMaskFilter()->filterPath(*devPathPtr, *fMatrix, *fRC, 992 fBounder, blitter.get(), 993 style)) { 994 return; // filterPath() called the blitter, so we're done 995 } 996 } 997 998 if (fBounder && !fBounder->doPath(*devPathPtr, *paint, doFill)) { 999 return; 1000 } 1001 1002 void (*proc)(const SkPath&, const SkRasterClip&, SkBlitter*); 1003 if (doFill) { 1004 if (paint->isAntiAlias()) { 1005 proc = SkScan::AntiFillPath; 1006 } else { 1007 proc = SkScan::FillPath; 1008 } 1009 } else { // hairline 1010 if (paint->isAntiAlias()) { 1011 proc = SkScan::AntiHairPath; 1012 } else { 1013 proc = SkScan::HairPath; 1014 } 1015 } 1016 proc(*devPathPtr, *fRC, blitter.get()); 1017} 1018 1019/** For the purposes of drawing bitmaps, if a matrix is "almost" translate 1020 go ahead and treat it as if it were, so that subsequent code can go fast. 1021 */ 1022static bool just_translate(const SkMatrix& matrix, const SkBitmap& bitmap) { 1023 SkMatrix::TypeMask mask = matrix.getType(); 1024 1025 if (mask & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) { 1026 return false; 1027 } 1028 if (mask & SkMatrix::kScale_Mask) { 1029 SkScalar sx = matrix[SkMatrix::kMScaleX]; 1030 SkScalar sy = matrix[SkMatrix::kMScaleY]; 1031 int w = bitmap.width(); 1032 int h = bitmap.height(); 1033 int sw = SkScalarRound(SkScalarMul(sx, SkIntToScalar(w))); 1034 int sh = SkScalarRound(SkScalarMul(sy, SkIntToScalar(h))); 1035 return sw == w && sh == h; 1036 } 1037 // if we got here, we're either kTranslate_Mask or identity 1038 return true; 1039} 1040 1041void SkDraw::drawBitmapAsMask(const SkBitmap& bitmap, 1042 const SkPaint& paint) const { 1043 SkASSERT(bitmap.getConfig() == SkBitmap::kA8_Config); 1044 1045 if (just_translate(*fMatrix, bitmap)) { 1046 int ix = SkScalarRound(fMatrix->getTranslateX()); 1047 int iy = SkScalarRound(fMatrix->getTranslateY()); 1048 1049 SkMask mask; 1050 mask.fBounds.set(ix, iy, ix + bitmap.width(), iy + bitmap.height()); 1051 mask.fFormat = SkMask::kA8_Format; 1052 mask.fRowBytes = bitmap.rowBytes(); 1053 mask.fImage = bitmap.getAddr8(0, 0); 1054 1055 this->drawDevMask(mask, paint); 1056 } else { // need to xform the bitmap first 1057 SkRect r; 1058 SkMask mask; 1059 1060 r.set(0, 0, 1061 SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height())); 1062 fMatrix->mapRect(&r); 1063 r.round(&mask.fBounds); 1064 1065 // set the mask's bounds to the transformed bitmap-bounds, 1066 // clipped to the actual device 1067 { 1068 SkIRect devBounds; 1069 devBounds.set(0, 0, fBitmap->width(), fBitmap->height()); 1070 // need intersect(l, t, r, b) on irect 1071 if (!mask.fBounds.intersect(devBounds)) { 1072 return; 1073 } 1074 } 1075 1076 mask.fFormat = SkMask::kA8_Format; 1077 mask.fRowBytes = SkAlign4(mask.fBounds.width()); 1078 size_t size = mask.computeImageSize(); 1079 if (0 == size) { 1080 // the mask is too big to allocated, draw nothing 1081 return; 1082 } 1083 1084 // allocate (and clear) our temp buffer to hold the transformed bitmap 1085 SkAutoMalloc storage(size); 1086 mask.fImage = (uint8_t*)storage.get(); 1087 memset(mask.fImage, 0, size); 1088 1089 // now draw our bitmap(src) into mask(dst), transformed by the matrix 1090 { 1091 SkBitmap device; 1092 device.setConfig(SkBitmap::kA8_Config, mask.fBounds.width(), 1093 mask.fBounds.height(), mask.fRowBytes); 1094 device.setPixels(mask.fImage); 1095 1096 SkCanvas c(device); 1097 // need the unclipped top/left for the translate 1098 c.translate(-SkIntToScalar(mask.fBounds.fLeft), 1099 -SkIntToScalar(mask.fBounds.fTop)); 1100 c.concat(*fMatrix); 1101 1102 // We can't call drawBitmap, or we'll infinitely recurse. Instead 1103 // we manually build a shader and draw that into our new mask 1104 SkPaint tmpPaint; 1105 tmpPaint.setFlags(paint.getFlags()); 1106 SkAutoBitmapShaderInstall install(bitmap, tmpPaint); 1107 SkRect rr; 1108 rr.set(0, 0, SkIntToScalar(bitmap.width()), 1109 SkIntToScalar(bitmap.height())); 1110 c.drawRect(rr, install.paintWithShader()); 1111 } 1112 this->drawDevMask(mask, paint); 1113 } 1114} 1115 1116static bool clipped_out(const SkMatrix& m, const SkRasterClip& c, 1117 const SkRect& srcR) { 1118 SkRect dstR; 1119 SkIRect devIR; 1120 1121 m.mapRect(&dstR, srcR); 1122 dstR.roundOut(&devIR); 1123 return c.quickReject(devIR); 1124} 1125 1126static bool clipped_out(const SkMatrix& matrix, const SkRasterClip& clip, 1127 int width, int height) { 1128 SkRect r; 1129 r.set(0, 0, SkIntToScalar(width), SkIntToScalar(height)); 1130 return clipped_out(matrix, clip, r); 1131} 1132 1133static bool clipHandlesSprite(const SkRasterClip& clip, int x, int y, 1134 const SkBitmap& bitmap) { 1135 return clip.isBW() || 1136 clip.quickContains(x, y, x + bitmap.width(), y + bitmap.height()); 1137} 1138 1139void SkDraw::drawBitmap(const SkBitmap& bitmap, const SkMatrix& prematrix, 1140 const SkPaint& origPaint) const { 1141 SkDEBUGCODE(this->validate();) 1142 1143 // nothing to draw 1144 if (fRC->isEmpty() || 1145 bitmap.width() == 0 || bitmap.height() == 0 || 1146 bitmap.getConfig() == SkBitmap::kNo_Config) { 1147 return; 1148 } 1149 1150#ifndef SK_ALLOW_OVER_32K_BITMAPS 1151 // run away on too-big bitmaps for now (exceed 16.16) 1152 if (bitmap.width() > 32767 || bitmap.height() > 32767) { 1153 return; 1154 } 1155#endif 1156 1157 SkPaint paint(origPaint); 1158 paint.setStyle(SkPaint::kFill_Style); 1159 1160 SkMatrix matrix; 1161 if (!matrix.setConcat(*fMatrix, prematrix)) { 1162 return; 1163 } 1164 1165 if (clipped_out(matrix, *fRC, bitmap.width(), bitmap.height())) { 1166 return; 1167 } 1168 1169 if (fBounder && just_translate(matrix, bitmap)) { 1170 SkIRect ir; 1171 int32_t ix = SkScalarRound(matrix.getTranslateX()); 1172 int32_t iy = SkScalarRound(matrix.getTranslateY()); 1173 ir.set(ix, iy, ix + bitmap.width(), iy + bitmap.height()); 1174 if (!fBounder->doIRect(ir)) { 1175 return; 1176 } 1177 } 1178 1179 // only lock the pixels if we passed the clip and bounder tests 1180 SkAutoLockPixels alp(bitmap); 1181 // after the lock, check if we are valid 1182 if (!bitmap.readyToDraw()) { 1183 return; 1184 } 1185 1186 if (bitmap.getConfig() != SkBitmap::kA8_Config && 1187 just_translate(matrix, bitmap)) { 1188 int ix = SkScalarRound(matrix.getTranslateX()); 1189 int iy = SkScalarRound(matrix.getTranslateY()); 1190 if (clipHandlesSprite(*fRC, ix, iy, bitmap)) { 1191 uint32_t storage[kBlitterStorageLongCount]; 1192 SkBlitter* blitter = SkBlitter::ChooseSprite(*fBitmap, paint, bitmap, 1193 ix, iy, storage, sizeof(storage)); 1194 if (blitter) { 1195 SkAutoTPlacementDelete<SkBlitter> ad(blitter, storage); 1196 1197 SkIRect ir; 1198 ir.set(ix, iy, ix + bitmap.width(), iy + bitmap.height()); 1199 1200 SkScan::FillIRect(ir, *fRC, blitter); 1201 return; 1202 } 1203 } 1204 } 1205 1206 // now make a temp draw on the stack, and use it 1207 // 1208 SkDraw draw(*this); 1209 draw.fMatrix = &matrix; 1210 1211 if (bitmap.getConfig() == SkBitmap::kA8_Config) { 1212 draw.drawBitmapAsMask(bitmap, paint); 1213 } else { 1214 SkAutoBitmapShaderInstall install(bitmap, paint); 1215 1216 SkRect r; 1217 r.set(0, 0, SkIntToScalar(bitmap.width()), 1218 SkIntToScalar(bitmap.height())); 1219 // is this ok if paint has a rasterizer? 1220 draw.drawRect(r, install.paintWithShader()); 1221 } 1222} 1223 1224void SkDraw::drawSprite(const SkBitmap& bitmap, int x, int y, 1225 const SkPaint& origPaint) const { 1226 SkDEBUGCODE(this->validate();) 1227 1228 // nothing to draw 1229 if (fRC->isEmpty() || 1230 bitmap.width() == 0 || bitmap.height() == 0 || 1231 bitmap.getConfig() == SkBitmap::kNo_Config) { 1232 return; 1233 } 1234 1235 SkIRect bounds; 1236 bounds.set(x, y, x + bitmap.width(), y + bitmap.height()); 1237 1238 if (fRC->quickReject(bounds)) { 1239 return; // nothing to draw 1240 } 1241 1242 SkPaint paint(origPaint); 1243 paint.setStyle(SkPaint::kFill_Style); 1244 1245 if (NULL == paint.getColorFilter() && clipHandlesSprite(*fRC, x, y, bitmap)) { 1246 uint32_t storage[kBlitterStorageLongCount]; 1247 SkBlitter* blitter = SkBlitter::ChooseSprite(*fBitmap, paint, bitmap, 1248 x, y, storage, sizeof(storage)); 1249 1250 if (blitter) { 1251 SkAutoTPlacementDelete<SkBlitter> ad(blitter, storage); 1252 1253 if (fBounder && !fBounder->doIRect(bounds)) { 1254 return; 1255 } 1256 1257 SkScan::FillIRect(bounds, *fRC, blitter); 1258 return; 1259 } 1260 } 1261 1262 SkAutoBitmapShaderInstall install(bitmap, paint); 1263 const SkPaint& shaderPaint = install.paintWithShader(); 1264 1265 SkMatrix matrix; 1266 SkRect r; 1267 1268 // get a scalar version of our rect 1269 r.set(bounds); 1270 1271 // tell the shader our offset 1272 matrix.setTranslate(r.fLeft, r.fTop); 1273 shaderPaint.getShader()->setLocalMatrix(matrix); 1274 1275 SkDraw draw(*this); 1276 matrix.reset(); 1277 draw.fMatrix = &matrix; 1278 // call ourself with a rect 1279 // is this OK if paint has a rasterizer? 1280 draw.drawRect(r, shaderPaint); 1281} 1282 1283/////////////////////////////////////////////////////////////////////////////// 1284 1285#include "SkScalerContext.h" 1286#include "SkGlyphCache.h" 1287#include "SkTextToPathIter.h" 1288#include "SkUtils.h" 1289 1290static void measure_text(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc, 1291 const char text[], size_t byteLength, SkVector* stopVector) { 1292 SkFixed x = 0, y = 0; 1293 const char* stop = text + byteLength; 1294 1295 SkAutoKern autokern; 1296 1297 while (text < stop) { 1298 // don't need x, y here, since all subpixel variants will have the 1299 // same advance 1300 const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0); 1301 1302 x += autokern.adjust(glyph) + glyph.fAdvanceX; 1303 y += glyph.fAdvanceY; 1304 } 1305 stopVector->set(SkFixedToScalar(x), SkFixedToScalar(y)); 1306 1307 SkASSERT(text == stop); 1308} 1309 1310void SkDraw::drawText_asPaths(const char text[], size_t byteLength, 1311 SkScalar x, SkScalar y, 1312 const SkPaint& paint) const { 1313 SkDEBUGCODE(this->validate();) 1314 1315 SkTextToPathIter iter(text, byteLength, paint, true); 1316 1317 SkMatrix matrix; 1318 matrix.setScale(iter.getPathScale(), iter.getPathScale()); 1319 matrix.postTranslate(x, y); 1320 1321 const SkPath* iterPath; 1322 SkScalar xpos, prevXPos = 0; 1323 1324 while (iter.next(&iterPath, &xpos)) { 1325 matrix.postTranslate(xpos - prevXPos, 0); 1326 if (iterPath) { 1327 const SkPaint& pnt = iter.getPaint(); 1328 if (fDevice) { 1329 fDevice->drawPath(*this, *iterPath, pnt, &matrix, false); 1330 } else { 1331 this->drawPath(*iterPath, pnt, &matrix, false); 1332 } 1333 } 1334 prevXPos = xpos; 1335 } 1336} 1337 1338// disable warning : local variable used without having been initialized 1339#if defined _WIN32 && _MSC_VER >= 1300 1340#pragma warning ( push ) 1341#pragma warning ( disable : 4701 ) 1342#endif 1343 1344////////////////////////////////////////////////////////////////////////////// 1345 1346static void D1G_NoBounder_RectClip(const SkDraw1Glyph& state, 1347 SkFixed fx, SkFixed fy, 1348 const SkGlyph& glyph) { 1349 int left = SkFixedFloor(fx); 1350 int top = SkFixedFloor(fy); 1351 SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0); 1352 SkASSERT(NULL == state.fBounder); 1353 SkASSERT((NULL == state.fClip && state.fAAClip) || 1354 (state.fClip && NULL == state.fAAClip && state.fClip->isRect())); 1355 1356 left += glyph.fLeft; 1357 top += glyph.fTop; 1358 1359 int right = left + glyph.fWidth; 1360 int bottom = top + glyph.fHeight; 1361 1362 SkMask mask; 1363 SkIRect storage; 1364 SkIRect* bounds = &mask.fBounds; 1365 1366 mask.fBounds.set(left, top, right, bottom); 1367 1368 // this extra test is worth it, assuming that most of the time it succeeds 1369 // since we can avoid writing to storage 1370 if (!state.fClipBounds.containsNoEmptyCheck(left, top, right, bottom)) { 1371 if (!storage.intersectNoEmptyCheck(mask.fBounds, state.fClipBounds)) 1372 return; 1373 bounds = &storage; 1374 } 1375 1376 uint8_t* aa = (uint8_t*)glyph.fImage; 1377 if (NULL == aa) { 1378 aa = (uint8_t*)state.fCache->findImage(glyph); 1379 if (NULL == aa) { 1380 return; // can't rasterize glyph 1381 } 1382 } 1383 1384 mask.fRowBytes = glyph.rowBytes(); 1385 mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat); 1386 mask.fImage = aa; 1387 state.fBlitter->blitMask(mask, *bounds); 1388} 1389 1390static void D1G_NoBounder_RgnClip(const SkDraw1Glyph& state, 1391 SkFixed fx, SkFixed fy, 1392 const SkGlyph& glyph) { 1393 int left = SkFixedFloor(fx); 1394 int top = SkFixedFloor(fy); 1395 SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0); 1396 SkASSERT(!state.fClip->isRect()); 1397 SkASSERT(NULL == state.fBounder); 1398 1399 SkMask mask; 1400 1401 left += glyph.fLeft; 1402 top += glyph.fTop; 1403 1404 mask.fBounds.set(left, top, left + glyph.fWidth, top + glyph.fHeight); 1405 SkRegion::Cliperator clipper(*state.fClip, mask.fBounds); 1406 1407 if (!clipper.done()) { 1408 const SkIRect& cr = clipper.rect(); 1409 const uint8_t* aa = (const uint8_t*)glyph.fImage; 1410 if (NULL == aa) { 1411 aa = (uint8_t*)state.fCache->findImage(glyph); 1412 if (NULL == aa) { 1413 return; 1414 } 1415 } 1416 1417 mask.fRowBytes = glyph.rowBytes(); 1418 mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat); 1419 mask.fImage = (uint8_t*)aa; 1420 do { 1421 state.fBlitter->blitMask(mask, cr); 1422 clipper.next(); 1423 } while (!clipper.done()); 1424 } 1425} 1426 1427static void D1G_Bounder(const SkDraw1Glyph& state, 1428 SkFixed fx, SkFixed fy, 1429 const SkGlyph& glyph) { 1430 int left = SkFixedFloor(fx); 1431 int top = SkFixedFloor(fy); 1432 SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0); 1433 1434 SkMask mask; 1435 1436 left += glyph.fLeft; 1437 top += glyph.fTop; 1438 1439 mask.fBounds.set(left, top, left + glyph.fWidth, top + glyph.fHeight); 1440 SkRegion::Cliperator clipper(*state.fClip, mask.fBounds); 1441 1442 if (!clipper.done()) { 1443 const SkIRect& cr = clipper.rect(); 1444 const uint8_t* aa = (const uint8_t*)glyph.fImage; 1445 if (NULL == aa) { 1446 aa = (uint8_t*)state.fCache->findImage(glyph); 1447 if (NULL == aa) { 1448 return; 1449 } 1450 } 1451 1452 // we need to pass the origin, which we approximate with our 1453 // (unadjusted) left,top coordinates (the caller called fixedfloor) 1454 if (state.fBounder->doIRectGlyph(cr, 1455 left - glyph.fLeft, 1456 top - glyph.fTop, glyph)) { 1457 mask.fRowBytes = glyph.rowBytes(); 1458 mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat); 1459 mask.fImage = (uint8_t*)aa; 1460 do { 1461 state.fBlitter->blitMask(mask, cr); 1462 clipper.next(); 1463 } while (!clipper.done()); 1464 } 1465 } 1466} 1467 1468static void D1G_Bounder_AAClip(const SkDraw1Glyph& state, 1469 SkFixed fx, SkFixed fy, 1470 const SkGlyph& glyph) { 1471 int left = SkFixedFloor(fx); 1472 int top = SkFixedFloor(fy); 1473 SkIRect bounds; 1474 bounds.set(left, top, left + glyph.fWidth, top + glyph.fHeight); 1475 1476 if (state.fBounder->doIRectGlyph(bounds, left, top, glyph)) { 1477 D1G_NoBounder_RectClip(state, fx, fy, glyph); 1478 } 1479} 1480 1481static bool hasCustomD1GProc(const SkDraw& draw) { 1482 return draw.fProcs && draw.fProcs->fD1GProc; 1483} 1484 1485static bool needsRasterTextBlit(const SkDraw& draw) { 1486 return !hasCustomD1GProc(draw); 1487} 1488 1489SkDraw1Glyph::Proc SkDraw1Glyph::init(const SkDraw* draw, SkBlitter* blitter, 1490 SkGlyphCache* cache) { 1491 fDraw = draw; 1492 fBounder = draw->fBounder; 1493 fBlitter = blitter; 1494 fCache = cache; 1495 1496 if (hasCustomD1GProc(*draw)) { 1497 // todo: fix this assumption about clips w/ custom 1498 fClip = draw->fClip; 1499 fClipBounds = fClip->getBounds(); 1500 return draw->fProcs->fD1GProc; 1501 } 1502 1503 if (draw->fRC->isBW()) { 1504 fAAClip = NULL; 1505 fClip = &draw->fRC->bwRgn(); 1506 fClipBounds = fClip->getBounds(); 1507 if (NULL == fBounder) { 1508 if (fClip->isRect()) { 1509 return D1G_NoBounder_RectClip; 1510 } else { 1511 return D1G_NoBounder_RgnClip; 1512 } 1513 } else { 1514 return D1G_Bounder; 1515 } 1516 } else { // aaclip 1517 fAAClip = &draw->fRC->aaRgn(); 1518 fClip = NULL; 1519 fClipBounds = fAAClip->getBounds(); 1520 if (NULL == fBounder) { 1521 return D1G_NoBounder_RectClip; 1522 } else { 1523 return D1G_Bounder_AAClip; 1524 } 1525 } 1526} 1527 1528/////////////////////////////////////////////////////////////////////////////// 1529 1530void SkDraw::drawText(const char text[], size_t byteLength, 1531 SkScalar x, SkScalar y, const SkPaint& paint) const { 1532 SkASSERT(byteLength == 0 || text != NULL); 1533 1534 SkDEBUGCODE(this->validate();) 1535 1536 // nothing to draw 1537 if (text == NULL || byteLength == 0 || fRC->isEmpty()) { 1538 return; 1539 } 1540 1541 if (/*paint.isLinearText() ||*/ 1542 (fMatrix->hasPerspective())) { 1543 this->drawText_asPaths(text, byteLength, x, y, paint); 1544 return; 1545 } 1546 1547 SkDrawCacheProc glyphCacheProc = paint.getDrawCacheProc(); 1548 1549 const SkMatrix* matrix = fMatrix; 1550 if (hasCustomD1GProc(*this)) { 1551 // only support the fMVMatrix (for now) for the GPU case, which also 1552 // sets the fD1GProc 1553 if (fMVMatrix) { 1554 matrix = fMVMatrix; 1555 } 1556 } 1557 1558 SkAutoGlyphCache autoCache(paint, matrix); 1559 SkGlyphCache* cache = autoCache.getCache(); 1560 1561 // transform our starting point 1562 { 1563 SkPoint loc; 1564 matrix->mapXY(x, y, &loc); 1565 x = loc.fX; 1566 y = loc.fY; 1567 } 1568 1569 // need to measure first 1570 if (paint.getTextAlign() != SkPaint::kLeft_Align) { 1571 SkVector stop; 1572 1573 measure_text(cache, glyphCacheProc, text, byteLength, &stop); 1574 1575 SkScalar stopX = stop.fX; 1576 SkScalar stopY = stop.fY; 1577 1578 if (paint.getTextAlign() == SkPaint::kCenter_Align) { 1579 stopX = SkScalarHalf(stopX); 1580 stopY = SkScalarHalf(stopY); 1581 } 1582 x -= stopX; 1583 y -= stopY; 1584 } 1585 1586 SkFixed fx = SkScalarToFixed(x); 1587 SkFixed fy = SkScalarToFixed(y); 1588 const char* stop = text + byteLength; 1589 1590 SkFixed fxMask = ~0; 1591 SkFixed fyMask = ~0; 1592 if (cache->isSubpixel()) { 1593 SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(*matrix); 1594 if (kX_SkAxisAlignment == baseline) { 1595 fyMask = 0; 1596 } else if (kY_SkAxisAlignment == baseline) { 1597 fxMask = 0; 1598 } 1599 1600 // apply bias here to avoid adding 1/2 the sampling frequency in the loop 1601 fx += SK_FixedHalf >> SkGlyph::kSubBits; 1602 fy += SK_FixedHalf >> SkGlyph::kSubBits; 1603 } else { 1604 fx += SK_FixedHalf; 1605 fy += SK_FixedHalf; 1606 } 1607 1608 SkAAClipBlitter aaBlitter; 1609 SkAutoBlitterChoose blitterChooser; 1610 SkBlitter* blitter = NULL; 1611 if (needsRasterTextBlit(*this)) { 1612 blitterChooser.choose(*fBitmap, *matrix, paint); 1613 blitter = blitterChooser.get(); 1614 if (fRC->isAA()) { 1615 aaBlitter.init(blitter, &fRC->aaRgn()); 1616 blitter = &aaBlitter; 1617 } 1618 } 1619 1620 SkAutoKern autokern; 1621 SkDraw1Glyph d1g; 1622 SkDraw1Glyph::Proc proc = d1g.init(this, blitter, cache); 1623 1624 while (text < stop) { 1625 const SkGlyph& glyph = glyphCacheProc(cache, &text, fx & fxMask, fy & fyMask); 1626 1627 fx += autokern.adjust(glyph); 1628 1629 if (glyph.fWidth) { 1630 proc(d1g, fx, fy, glyph); 1631 } 1632 fx += glyph.fAdvanceX; 1633 fy += glyph.fAdvanceY; 1634 } 1635} 1636 1637// last parameter is interpreted as SkFixed [x, y] 1638// return the fixed position, which may be rounded or not by the caller 1639// e.g. subpixel doesn't round 1640typedef void (*AlignProc)(const SkPoint&, const SkGlyph&, SkIPoint*); 1641 1642static void leftAlignProc(const SkPoint& loc, const SkGlyph& glyph, 1643 SkIPoint* dst) { 1644 dst->set(SkScalarToFixed(loc.fX), SkScalarToFixed(loc.fY)); 1645} 1646 1647static void centerAlignProc(const SkPoint& loc, const SkGlyph& glyph, 1648 SkIPoint* dst) { 1649 dst->set(SkScalarToFixed(loc.fX) - (glyph.fAdvanceX >> 1), 1650 SkScalarToFixed(loc.fY) - (glyph.fAdvanceY >> 1)); 1651} 1652 1653static void rightAlignProc(const SkPoint& loc, const SkGlyph& glyph, 1654 SkIPoint* dst) { 1655 dst->set(SkScalarToFixed(loc.fX) - glyph.fAdvanceX, 1656 SkScalarToFixed(loc.fY) - glyph.fAdvanceY); 1657} 1658 1659static AlignProc pick_align_proc(SkPaint::Align align) { 1660 static const AlignProc gProcs[] = { 1661 leftAlignProc, centerAlignProc, rightAlignProc 1662 }; 1663 1664 SkASSERT((unsigned)align < SK_ARRAY_COUNT(gProcs)); 1665 1666 return gProcs[align]; 1667} 1668 1669class TextMapState { 1670public: 1671 mutable SkPoint fLoc; 1672 1673 TextMapState(const SkMatrix& matrix, SkScalar y) 1674 : fMatrix(matrix), fProc(matrix.getMapXYProc()), fY(y) {} 1675 1676 typedef void (*Proc)(const TextMapState&, const SkScalar pos[]); 1677 1678 Proc pickProc(int scalarsPerPosition); 1679 1680private: 1681 const SkMatrix& fMatrix; 1682 SkMatrix::MapXYProc fProc; 1683 SkScalar fY; // ignored by MapXYProc 1684 // these are only used by Only... procs 1685 SkScalar fScaleX, fTransX, fTransformedY; 1686 1687 static void MapXProc(const TextMapState& state, const SkScalar pos[]) { 1688 state.fProc(state.fMatrix, *pos, state.fY, &state.fLoc); 1689 } 1690 1691 static void MapXYProc(const TextMapState& state, const SkScalar pos[]) { 1692 state.fProc(state.fMatrix, pos[0], pos[1], &state.fLoc); 1693 } 1694 1695 static void MapOnlyScaleXProc(const TextMapState& state, 1696 const SkScalar pos[]) { 1697 state.fLoc.set(SkScalarMul(state.fScaleX, *pos) + state.fTransX, 1698 state.fTransformedY); 1699 } 1700 1701 static void MapOnlyTransXProc(const TextMapState& state, 1702 const SkScalar pos[]) { 1703 state.fLoc.set(*pos + state.fTransX, state.fTransformedY); 1704 } 1705}; 1706 1707TextMapState::Proc TextMapState::pickProc(int scalarsPerPosition) { 1708 SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); 1709 1710 if (1 == scalarsPerPosition) { 1711 unsigned mtype = fMatrix.getType(); 1712 if (mtype & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) { 1713 return MapXProc; 1714 } else { 1715 fScaleX = fMatrix.getScaleX(); 1716 fTransX = fMatrix.getTranslateX(); 1717 fTransformedY = SkScalarMul(fY, fMatrix.getScaleY()) + 1718 fMatrix.getTranslateY(); 1719 return (mtype & SkMatrix::kScale_Mask) ? 1720 MapOnlyScaleXProc : MapOnlyTransXProc; 1721 } 1722 } else { 1723 return MapXYProc; 1724 } 1725} 1726 1727////////////////////////////////////////////////////////////////////////////// 1728 1729void SkDraw::drawPosText(const char text[], size_t byteLength, 1730 const SkScalar pos[], SkScalar constY, 1731 int scalarsPerPosition, const SkPaint& paint) const { 1732 SkASSERT(byteLength == 0 || text != NULL); 1733 SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); 1734 1735 SkDEBUGCODE(this->validate();) 1736 1737 // nothing to draw 1738 if (text == NULL || byteLength == 0 || fRC->isEmpty()) { 1739 return; 1740 } 1741 1742 if (/*paint.isLinearText() ||*/ 1743 (fMatrix->hasPerspective())) { 1744 // TODO !!!! 1745// this->drawText_asPaths(text, byteLength, x, y, paint); 1746 return; 1747 } 1748 1749 const SkMatrix* matrix = fMatrix; 1750 if (hasCustomD1GProc(*this)) { 1751 // only support the fMVMatrix (for now) for the GPU case, which also 1752 // sets the fD1GProc 1753 if (fMVMatrix) { 1754 matrix = fMVMatrix; 1755 } 1756 } 1757 1758 SkDrawCacheProc glyphCacheProc = paint.getDrawCacheProc(); 1759 SkAutoGlyphCache autoCache(paint, matrix); 1760 SkGlyphCache* cache = autoCache.getCache(); 1761 1762 SkAAClipBlitterWrapper wrapper; 1763 SkAutoBlitterChoose blitterChooser; 1764 SkBlitter* blitter = NULL; 1765 if (needsRasterTextBlit(*this)) { 1766 blitterChooser.choose(*fBitmap, *matrix, paint); 1767 blitter = blitterChooser.get(); 1768 if (fRC->isAA()) { 1769 wrapper.init(*fRC, blitter); 1770 blitter = wrapper.getBlitter(); 1771 } 1772 } 1773 1774 const char* stop = text + byteLength; 1775 AlignProc alignProc = pick_align_proc(paint.getTextAlign()); 1776 SkDraw1Glyph d1g; 1777 SkDraw1Glyph::Proc proc = d1g.init(this, blitter, cache); 1778 TextMapState tms(*matrix, constY); 1779 TextMapState::Proc tmsProc = tms.pickProc(scalarsPerPosition); 1780 1781 if (cache->isSubpixel()) { 1782 // maybe we should skip the rounding if linearText is set 1783 SkAxisAlignment roundBaseline = SkComputeAxisAlignmentForHText(*matrix); 1784 1785 if (SkPaint::kLeft_Align == paint.getTextAlign()) { 1786 while (text < stop) { 1787 1788 tmsProc(tms, pos); 1789 1790#ifdef SK_DRAW_POS_TEXT_IGNORE_SUBPIXEL_LEFT_ALIGN_FIX 1791 SkFixed fx = SkScalarToFixed(tms.fLoc.fX); 1792 SkFixed fy = SkScalarToFixed(tms.fLoc.fY); 1793#else 1794 SkFixed fx = SkScalarToFixed(tms.fLoc.fX) + (SK_FixedHalf >> SkGlyph::kSubBits); 1795 SkFixed fy = SkScalarToFixed(tms.fLoc.fY) + (SK_FixedHalf >> SkGlyph::kSubBits); 1796#endif 1797 SkFixed fxMask = ~0; 1798 SkFixed fyMask = ~0; 1799 1800 if (kX_SkAxisAlignment == roundBaseline) { 1801 fyMask = 0; 1802 } else if (kY_SkAxisAlignment == roundBaseline) { 1803 fxMask = 0; 1804 } 1805 1806 const SkGlyph& glyph = glyphCacheProc(cache, &text, 1807 fx & fxMask, fy & fyMask); 1808 1809 if (glyph.fWidth) { 1810 proc(d1g, fx, fy, glyph); 1811 } 1812 pos += scalarsPerPosition; 1813 } 1814 } else { 1815 while (text < stop) { 1816 const char* currentText = text; 1817 const SkGlyph* glyph = &glyphCacheProc(cache, &text, 0, 0); 1818 1819 if (glyph->fWidth) { 1820 SkDEBUGCODE(SkFixed prevAdvX = glyph->fAdvanceX;) 1821 SkDEBUGCODE(SkFixed prevAdvY = glyph->fAdvanceY;) 1822 1823 SkFixed fx, fy; 1824 SkFixed fxMask = ~0; 1825 SkFixed fyMask = ~0; 1826 tmsProc(tms, pos); 1827 1828 { 1829 SkIPoint fixedLoc; 1830 alignProc(tms.fLoc, *glyph, &fixedLoc); 1831 fx = fixedLoc.fX + (SK_FixedHalf >> SkGlyph::kSubBits); 1832 fy = fixedLoc.fY + (SK_FixedHalf >> SkGlyph::kSubBits); 1833 1834 if (kX_SkAxisAlignment == roundBaseline) { 1835 fyMask = 0; 1836 } else if (kY_SkAxisAlignment == roundBaseline) { 1837 fxMask = 0; 1838 } 1839 } 1840 1841 // have to call again, now that we've been "aligned" 1842 glyph = &glyphCacheProc(cache, ¤tText, 1843 fx & fxMask, fy & fyMask); 1844 // the assumption is that the advance hasn't changed 1845 SkASSERT(prevAdvX == glyph->fAdvanceX); 1846 SkASSERT(prevAdvY == glyph->fAdvanceY); 1847 1848 proc(d1g, fx, fy, *glyph); 1849 } 1850 pos += scalarsPerPosition; 1851 } 1852 } 1853 } else { // not subpixel 1854 if (SkPaint::kLeft_Align == paint.getTextAlign()) { 1855 while (text < stop) { 1856 // the last 2 parameters are ignored 1857 const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0); 1858 1859 if (glyph.fWidth) { 1860 tmsProc(tms, pos); 1861 1862 proc(d1g, 1863 SkScalarToFixed(tms.fLoc.fX) + SK_FixedHalf, 1864 SkScalarToFixed(tms.fLoc.fY) + SK_FixedHalf, 1865 glyph); 1866 } 1867 pos += scalarsPerPosition; 1868 } 1869 } else { 1870 while (text < stop) { 1871 // the last 2 parameters are ignored 1872 const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0); 1873 1874 if (glyph.fWidth) { 1875 tmsProc(tms, pos); 1876 1877 SkIPoint fixedLoc; 1878 alignProc(tms.fLoc, glyph, &fixedLoc); 1879 1880 proc(d1g, 1881 fixedLoc.fX + SK_FixedHalf, 1882 fixedLoc.fY + SK_FixedHalf, 1883 glyph); 1884 } 1885 pos += scalarsPerPosition; 1886 } 1887 } 1888 } 1889} 1890 1891#if defined _WIN32 && _MSC_VER >= 1300 1892#pragma warning ( pop ) 1893#endif 1894 1895/////////////////////////////////////////////////////////////////////////////// 1896 1897#include "SkPathMeasure.h" 1898 1899static void morphpoints(SkPoint dst[], const SkPoint src[], int count, 1900 SkPathMeasure& meas, const SkMatrix& matrix) { 1901 SkMatrix::MapXYProc proc = matrix.getMapXYProc(); 1902 1903 for (int i = 0; i < count; i++) { 1904 SkPoint pos; 1905 SkVector tangent; 1906 1907 proc(matrix, src[i].fX, src[i].fY, &pos); 1908 SkScalar sx = pos.fX; 1909 SkScalar sy = pos.fY; 1910 1911 if (!meas.getPosTan(sx, &pos, &tangent)) { 1912 // set to 0 if the measure failed, so that we just set dst == pos 1913 tangent.set(0, 0); 1914 } 1915 1916 /* This is the old way (that explains our approach but is way too slow 1917 SkMatrix matrix; 1918 SkPoint pt; 1919 1920 pt.set(sx, sy); 1921 matrix.setSinCos(tangent.fY, tangent.fX); 1922 matrix.preTranslate(-sx, 0); 1923 matrix.postTranslate(pos.fX, pos.fY); 1924 matrix.mapPoints(&dst[i], &pt, 1); 1925 */ 1926 dst[i].set(pos.fX - SkScalarMul(tangent.fY, sy), 1927 pos.fY + SkScalarMul(tangent.fX, sy)); 1928 } 1929} 1930 1931/* TODO 1932 1933 Need differentially more subdivisions when the follow-path is curvy. Not sure how to 1934 determine that, but we need it. I guess a cheap answer is let the caller tell us, 1935 but that seems like a cop-out. Another answer is to get Rob Johnson to figure it out. 1936*/ 1937static void morphpath(SkPath* dst, const SkPath& src, SkPathMeasure& meas, 1938 const SkMatrix& matrix) { 1939 SkPath::Iter iter(src, false); 1940 SkPoint srcP[4], dstP[3]; 1941 SkPath::Verb verb; 1942 1943 while ((verb = iter.next(srcP)) != SkPath::kDone_Verb) { 1944 switch (verb) { 1945 case SkPath::kMove_Verb: 1946 morphpoints(dstP, srcP, 1, meas, matrix); 1947 dst->moveTo(dstP[0]); 1948 break; 1949 case SkPath::kLine_Verb: 1950 // turn lines into quads to look bendy 1951 srcP[0].fX = SkScalarAve(srcP[0].fX, srcP[1].fX); 1952 srcP[0].fY = SkScalarAve(srcP[0].fY, srcP[1].fY); 1953 morphpoints(dstP, srcP, 2, meas, matrix); 1954 dst->quadTo(dstP[0], dstP[1]); 1955 break; 1956 case SkPath::kQuad_Verb: 1957 morphpoints(dstP, &srcP[1], 2, meas, matrix); 1958 dst->quadTo(dstP[0], dstP[1]); 1959 break; 1960 case SkPath::kCubic_Verb: 1961 morphpoints(dstP, &srcP[1], 3, meas, matrix); 1962 dst->cubicTo(dstP[0], dstP[1], dstP[2]); 1963 break; 1964 case SkPath::kClose_Verb: 1965 dst->close(); 1966 break; 1967 default: 1968 SkDEBUGFAIL("unknown verb"); 1969 break; 1970 } 1971 } 1972} 1973 1974void SkDraw::drawTextOnPath(const char text[], size_t byteLength, 1975 const SkPath& follow, const SkMatrix* matrix, 1976 const SkPaint& paint) const { 1977 SkASSERT(byteLength == 0 || text != NULL); 1978 1979 // nothing to draw 1980 if (text == NULL || byteLength == 0 || fRC->isEmpty()) { 1981 return; 1982 } 1983 1984 SkTextToPathIter iter(text, byteLength, paint, true); 1985 SkPathMeasure meas(follow, false); 1986 SkScalar hOffset = 0; 1987 1988 // need to measure first 1989 if (paint.getTextAlign() != SkPaint::kLeft_Align) { 1990 SkScalar pathLen = meas.getLength(); 1991 if (paint.getTextAlign() == SkPaint::kCenter_Align) { 1992 pathLen = SkScalarHalf(pathLen); 1993 } 1994 hOffset += pathLen; 1995 } 1996 1997 const SkPath* iterPath; 1998 SkScalar xpos; 1999 SkMatrix scaledMatrix; 2000 SkScalar scale = iter.getPathScale(); 2001 2002 scaledMatrix.setScale(scale, scale); 2003 2004 while (iter.next(&iterPath, &xpos)) { 2005 if (iterPath) { 2006 SkPath tmp; 2007 SkMatrix m(scaledMatrix); 2008 2009 m.postTranslate(xpos + hOffset, 0); 2010 if (matrix) { 2011 m.postConcat(*matrix); 2012 } 2013 morphpath(&tmp, *iterPath, meas, m); 2014 if (fDevice) { 2015 fDevice->drawPath(*this, tmp, iter.getPaint(), NULL, true); 2016 } else { 2017 this->drawPath(tmp, iter.getPaint(), NULL, true); 2018 } 2019 } 2020 } 2021} 2022 2023#ifdef SK_BUILD_FOR_ANDROID 2024void SkDraw::drawPosTextOnPath(const char text[], size_t byteLength, 2025 const SkPoint pos[], const SkPaint& paint, 2026 const SkPath& path, const SkMatrix* matrix) const { 2027 // nothing to draw 2028 if (text == NULL || byteLength == 0 || fRC->isEmpty()) { 2029 return; 2030 } 2031 2032 SkMatrix scaledMatrix; 2033 SkPathMeasure meas(path, false); 2034 2035 SkMeasureCacheProc glyphCacheProc = paint.getMeasureCacheProc( 2036 SkPaint::kForward_TextBufferDirection, true); 2037 2038 // Copied (modified) from SkTextToPathIter constructor to setup paint 2039 SkPaint tempPaint(paint); 2040 2041 tempPaint.setLinearText(true); 2042 tempPaint.setMaskFilter(NULL); // don't want this affecting our path-cache lookup 2043 2044 if (tempPaint.getPathEffect() == NULL && !(tempPaint.getStrokeWidth() > 0 2045 && tempPaint.getStyle() != SkPaint::kFill_Style)) { 2046 tempPaint.setStyle(SkPaint::kFill_Style); 2047 tempPaint.setPathEffect(NULL); 2048 } 2049 // End copied from SkTextToPathIter constructor 2050 2051 // detach cache 2052 SkGlyphCache* cache = tempPaint.detachCache(NULL); 2053 2054 // Must set scale, even if 1 2055 SkScalar scale = SK_Scalar1; 2056 scaledMatrix.setScale(scale, scale); 2057 2058 // Loop over all glyph ids 2059 for (const char* stop = text + byteLength; text < stop; pos++) { 2060 2061 const SkGlyph& glyph = glyphCacheProc(cache, &text); 2062 SkPath tmp; 2063 2064 const SkPath* glyphPath = cache->findPath(glyph); 2065 if (glyphPath == NULL) { 2066 continue; 2067 } 2068 2069 SkMatrix m(scaledMatrix); 2070 m.postTranslate(pos->fX, 0); 2071 2072 if (matrix) { 2073 m.postConcat(*matrix); 2074 } 2075 2076 morphpath(&tmp, *glyphPath, meas, m); 2077 this->drawPath(tmp, tempPaint); 2078 2079 } 2080 2081 // re-attach cache 2082 SkGlyphCache::AttachCache(cache); 2083} 2084#endif 2085 2086/////////////////////////////////////////////////////////////////////////////// 2087 2088struct VertState { 2089 int f0, f1, f2; 2090 2091 VertState(int vCount, const uint16_t indices[], int indexCount) 2092 : fIndices(indices) { 2093 fCurrIndex = 0; 2094 if (indices) { 2095 fCount = indexCount; 2096 } else { 2097 fCount = vCount; 2098 } 2099 } 2100 2101 typedef bool (*Proc)(VertState*); 2102 Proc chooseProc(SkCanvas::VertexMode mode); 2103 2104private: 2105 int fCount; 2106 int fCurrIndex; 2107 const uint16_t* fIndices; 2108 2109 static bool Triangles(VertState*); 2110 static bool TrianglesX(VertState*); 2111 static bool TriangleStrip(VertState*); 2112 static bool TriangleStripX(VertState*); 2113 static bool TriangleFan(VertState*); 2114 static bool TriangleFanX(VertState*); 2115}; 2116 2117bool VertState::Triangles(VertState* state) { 2118 int index = state->fCurrIndex; 2119 if (index + 3 > state->fCount) { 2120 return false; 2121 } 2122 state->f0 = index + 0; 2123 state->f1 = index + 1; 2124 state->f2 = index + 2; 2125 state->fCurrIndex = index + 3; 2126 return true; 2127} 2128 2129bool VertState::TrianglesX(VertState* state) { 2130 const uint16_t* indices = state->fIndices; 2131 int index = state->fCurrIndex; 2132 if (index + 3 > state->fCount) { 2133 return false; 2134 } 2135 state->f0 = indices[index + 0]; 2136 state->f1 = indices[index + 1]; 2137 state->f2 = indices[index + 2]; 2138 state->fCurrIndex = index + 3; 2139 return true; 2140} 2141 2142bool VertState::TriangleStrip(VertState* state) { 2143 int index = state->fCurrIndex; 2144 if (index + 3 > state->fCount) { 2145 return false; 2146 } 2147 state->f2 = index + 2; 2148 if (index & 1) { 2149 state->f0 = index + 1; 2150 state->f1 = index + 0; 2151 } else { 2152 state->f0 = index + 0; 2153 state->f1 = index + 1; 2154 } 2155 state->fCurrIndex = index + 1; 2156 return true; 2157} 2158 2159bool VertState::TriangleStripX(VertState* state) { 2160 const uint16_t* indices = state->fIndices; 2161 int index = state->fCurrIndex; 2162 if (index + 3 > state->fCount) { 2163 return false; 2164 } 2165 state->f2 = indices[index + 2]; 2166 if (index & 1) { 2167 state->f0 = indices[index + 1]; 2168 state->f1 = indices[index + 0]; 2169 } else { 2170 state->f0 = indices[index + 0]; 2171 state->f1 = indices[index + 1]; 2172 } 2173 state->fCurrIndex = index + 1; 2174 return true; 2175} 2176 2177bool VertState::TriangleFan(VertState* state) { 2178 int index = state->fCurrIndex; 2179 if (index + 3 > state->fCount) { 2180 return false; 2181 } 2182 state->f0 = 0; 2183 state->f1 = index + 1; 2184 state->f2 = index + 2; 2185 state->fCurrIndex = index + 1; 2186 return true; 2187} 2188 2189bool VertState::TriangleFanX(VertState* state) { 2190 const uint16_t* indices = state->fIndices; 2191 int index = state->fCurrIndex; 2192 if (index + 3 > state->fCount) { 2193 return false; 2194 } 2195 state->f0 = indices[0]; 2196 state->f1 = indices[index + 1]; 2197 state->f2 = indices[index + 2]; 2198 state->fCurrIndex = index + 1; 2199 return true; 2200} 2201 2202VertState::Proc VertState::chooseProc(SkCanvas::VertexMode mode) { 2203 switch (mode) { 2204 case SkCanvas::kTriangles_VertexMode: 2205 return fIndices ? TrianglesX : Triangles; 2206 case SkCanvas::kTriangleStrip_VertexMode: 2207 return fIndices ? TriangleStripX : TriangleStrip; 2208 case SkCanvas::kTriangleFan_VertexMode: 2209 return fIndices ? TriangleFanX : TriangleFan; 2210 default: 2211 return NULL; 2212 } 2213} 2214 2215typedef void (*HairProc)(const SkPoint&, const SkPoint&, const SkRasterClip&, 2216 SkBlitter*); 2217 2218static HairProc ChooseHairProc(bool doAntiAlias) { 2219 return doAntiAlias ? SkScan::AntiHairLine : SkScan::HairLine; 2220} 2221 2222static bool texture_to_matrix(const VertState& state, const SkPoint verts[], 2223 const SkPoint texs[], SkMatrix* matrix) { 2224 SkPoint src[3], dst[3]; 2225 2226 src[0] = texs[state.f0]; 2227 src[1] = texs[state.f1]; 2228 src[2] = texs[state.f2]; 2229 dst[0] = verts[state.f0]; 2230 dst[1] = verts[state.f1]; 2231 dst[2] = verts[state.f2]; 2232 return matrix->setPolyToPoly(src, dst, 3); 2233} 2234 2235class SkTriColorShader : public SkShader { 2236public: 2237 SkTriColorShader() {} 2238 2239 bool setup(const SkPoint pts[], const SkColor colors[], int, int, int); 2240 2241 virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count); 2242 2243 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTriColorShader) 2244 2245protected: 2246 SkTriColorShader(SkFlattenableReadBuffer& buffer) : SkShader(buffer) {} 2247 2248private: 2249 SkMatrix fDstToUnit; 2250 SkPMColor fColors[3]; 2251 2252 typedef SkShader INHERITED; 2253}; 2254 2255bool SkTriColorShader::setup(const SkPoint pts[], const SkColor colors[], 2256 int index0, int index1, int index2) { 2257 2258 fColors[0] = SkPreMultiplyColor(colors[index0]); 2259 fColors[1] = SkPreMultiplyColor(colors[index1]); 2260 fColors[2] = SkPreMultiplyColor(colors[index2]); 2261 2262 SkMatrix m, im; 2263 m.reset(); 2264 m.set(0, pts[index1].fX - pts[index0].fX); 2265 m.set(1, pts[index2].fX - pts[index0].fX); 2266 m.set(2, pts[index0].fX); 2267 m.set(3, pts[index1].fY - pts[index0].fY); 2268 m.set(4, pts[index2].fY - pts[index0].fY); 2269 m.set(5, pts[index0].fY); 2270 if (!m.invert(&im)) { 2271 return false; 2272 } 2273 return fDstToUnit.setConcat(im, this->getTotalInverse()); 2274} 2275 2276#include "SkColorPriv.h" 2277#include "SkComposeShader.h" 2278 2279static int ScalarTo256(SkScalar v) { 2280 int scale = SkScalarToFixed(v) >> 8; 2281 if (scale < 0) { 2282 scale = 0; 2283 } 2284 if (scale > 255) { 2285 scale = 255; 2286 } 2287 return SkAlpha255To256(scale); 2288} 2289 2290void SkTriColorShader::shadeSpan(int x, int y, SkPMColor dstC[], int count) { 2291 SkPoint src; 2292 2293 for (int i = 0; i < count; i++) { 2294 fDstToUnit.mapXY(SkIntToScalar(x), SkIntToScalar(y), &src); 2295 x += 1; 2296 2297 int scale1 = ScalarTo256(src.fX); 2298 int scale2 = ScalarTo256(src.fY); 2299 int scale0 = 256 - scale1 - scale2; 2300 if (scale0 < 0) { 2301 if (scale1 > scale2) { 2302 scale2 = 256 - scale1; 2303 } else { 2304 scale1 = 256 - scale2; 2305 } 2306 scale0 = 0; 2307 } 2308 2309 dstC[i] = SkAlphaMulQ(fColors[0], scale0) + 2310 SkAlphaMulQ(fColors[1], scale1) + 2311 SkAlphaMulQ(fColors[2], scale2); 2312 } 2313} 2314 2315void SkDraw::drawVertices(SkCanvas::VertexMode vmode, int count, 2316 const SkPoint vertices[], const SkPoint textures[], 2317 const SkColor colors[], SkXfermode* xmode, 2318 const uint16_t indices[], int indexCount, 2319 const SkPaint& paint) const { 2320 SkASSERT(0 == count || NULL != vertices); 2321 2322 // abort early if there is nothing to draw 2323 if (count < 3 || (indices && indexCount < 3) || fRC->isEmpty()) { 2324 return; 2325 } 2326 2327 // transform out vertices into device coordinates 2328 SkAutoSTMalloc<16, SkPoint> storage(count); 2329 SkPoint* devVerts = storage.get(); 2330 fMatrix->mapPoints(devVerts, vertices, count); 2331 2332 if (fBounder) { 2333 SkRect bounds; 2334 bounds.set(devVerts, count); 2335 if (!fBounder->doRect(bounds, paint)) { 2336 return; 2337 } 2338 } 2339 2340 /* 2341 We can draw the vertices in 1 of 4 ways: 2342 2343 - solid color (no shader/texture[], no colors[]) 2344 - just colors (no shader/texture[], has colors[]) 2345 - just texture (has shader/texture[], no colors[]) 2346 - colors * texture (has shader/texture[], has colors[]) 2347 2348 Thus for texture drawing, we need both texture[] and a shader. 2349 */ 2350 2351 SkTriColorShader triShader; // must be above declaration of p 2352 SkPaint p(paint); 2353 2354 SkShader* shader = p.getShader(); 2355 if (NULL == shader) { 2356 // if we have no shader, we ignore the texture coordinates 2357 textures = NULL; 2358 } else if (NULL == textures) { 2359 // if we don't have texture coordinates, ignore the shader 2360 p.setShader(NULL); 2361 shader = NULL; 2362 } 2363 2364 // setup the custom shader (if needed) 2365 if (NULL != colors) { 2366 if (NULL == textures) { 2367 // just colors (no texture) 2368 p.setShader(&triShader); 2369 } else { 2370 // colors * texture 2371 SkASSERT(shader); 2372 bool releaseMode = false; 2373 if (NULL == xmode) { 2374 xmode = SkXfermode::Create(SkXfermode::kMultiply_Mode); 2375 releaseMode = true; 2376 } 2377 SkShader* compose = SkNEW_ARGS(SkComposeShader, 2378 (&triShader, shader, xmode)); 2379 p.setShader(compose)->unref(); 2380 if (releaseMode) { 2381 xmode->unref(); 2382 } 2383 } 2384 } 2385 2386 SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, p); 2387 // setup our state and function pointer for iterating triangles 2388 VertState state(count, indices, indexCount); 2389 VertState::Proc vertProc = state.chooseProc(vmode); 2390 2391 if (NULL != textures || NULL != colors) { 2392 SkMatrix localM, tempM; 2393 bool hasLocalM = shader && shader->getLocalMatrix(&localM); 2394 2395 if (NULL != colors) { 2396 if (!triShader.setContext(*fBitmap, p, *fMatrix)) { 2397 colors = NULL; 2398 } 2399 } 2400 2401 while (vertProc(&state)) { 2402 if (NULL != textures) { 2403 if (texture_to_matrix(state, vertices, textures, &tempM)) { 2404 if (hasLocalM) { 2405 tempM.postConcat(localM); 2406 } 2407 shader->setLocalMatrix(tempM); 2408 // need to recal setContext since we changed the local matrix 2409 if (!shader->setContext(*fBitmap, p, *fMatrix)) { 2410 continue; 2411 } 2412 } 2413 } 2414 if (NULL != colors) { 2415 if (!triShader.setup(vertices, colors, 2416 state.f0, state.f1, state.f2)) { 2417 continue; 2418 } 2419 } 2420 2421 SkPoint tmp[] = { 2422 devVerts[state.f0], devVerts[state.f1], devVerts[state.f2] 2423 }; 2424 SkScan::FillTriangle(tmp, *fRC, blitter.get()); 2425 } 2426 // now restore the shader's original local matrix 2427 if (NULL != shader) { 2428 if (hasLocalM) { 2429 shader->setLocalMatrix(localM); 2430 } else { 2431 shader->resetLocalMatrix(); 2432 } 2433 } 2434 } else { 2435 // no colors[] and no texture 2436 HairProc hairProc = ChooseHairProc(paint.isAntiAlias()); 2437 const SkRasterClip& clip = *fRC; 2438 while (vertProc(&state)) { 2439 hairProc(devVerts[state.f0], devVerts[state.f1], clip, blitter.get()); 2440 hairProc(devVerts[state.f1], devVerts[state.f2], clip, blitter.get()); 2441 hairProc(devVerts[state.f2], devVerts[state.f0], clip, blitter.get()); 2442 } 2443 } 2444} 2445 2446/////////////////////////////////////////////////////////////////////////////// 2447/////////////////////////////////////////////////////////////////////////////// 2448 2449#ifdef SK_DEBUG 2450 2451void SkDraw::validate() const { 2452 SkASSERT(fBitmap != NULL); 2453 SkASSERT(fMatrix != NULL); 2454 SkASSERT(fClip != NULL); 2455 SkASSERT(fRC != NULL); 2456 2457 const SkIRect& cr = fRC->getBounds(); 2458 SkIRect br; 2459 2460 br.set(0, 0, fBitmap->width(), fBitmap->height()); 2461 SkASSERT(cr.isEmpty() || br.contains(cr)); 2462 2463 // assert that both are null, or both are not-null 2464 SkASSERT(!fMVMatrix == !fExtMatrix); 2465} 2466 2467#endif 2468 2469/////////////////////////////////////////////////////////////////////////////// 2470 2471SkBounder::SkBounder() { 2472 // initialize up front. This gets reset by SkCanvas before each draw call. 2473 fClip = &SkRegion::GetEmptyRegion(); 2474} 2475 2476bool SkBounder::doIRect(const SkIRect& r) { 2477 SkIRect rr; 2478 return rr.intersect(fClip->getBounds(), r) && this->onIRect(rr); 2479} 2480 2481// TODO: change the prototype to take fixed, and update the callers 2482bool SkBounder::doIRectGlyph(const SkIRect& r, int x, int y, 2483 const SkGlyph& glyph) { 2484 SkIRect rr; 2485 if (!rr.intersect(fClip->getBounds(), r)) { 2486 return false; 2487 } 2488 GlyphRec rec; 2489 rec.fLSB.set(SkIntToFixed(x), SkIntToFixed(y)); 2490 rec.fRSB.set(rec.fLSB.fX + glyph.fAdvanceX, 2491 rec.fLSB.fY + glyph.fAdvanceY); 2492 rec.fGlyphID = glyph.getGlyphID(); 2493 rec.fFlags = 0; 2494 return this->onIRectGlyph(rr, rec); 2495} 2496 2497bool SkBounder::doHairline(const SkPoint& pt0, const SkPoint& pt1, 2498 const SkPaint& paint) { 2499 SkIRect r; 2500 SkScalar v0, v1; 2501 2502 v0 = pt0.fX; 2503 v1 = pt1.fX; 2504 if (v0 > v1) { 2505 SkTSwap<SkScalar>(v0, v1); 2506 } 2507 r.fLeft = SkScalarFloor(v0); 2508 r.fRight = SkScalarCeil(v1); 2509 2510 v0 = pt0.fY; 2511 v1 = pt1.fY; 2512 if (v0 > v1) { 2513 SkTSwap<SkScalar>(v0, v1); 2514 } 2515 r.fTop = SkScalarFloor(v0); 2516 r.fBottom = SkScalarCeil(v1); 2517 2518 if (paint.isAntiAlias()) { 2519 r.inset(-1, -1); 2520 } 2521 return this->doIRect(r); 2522} 2523 2524bool SkBounder::doRect(const SkRect& rect, const SkPaint& paint) { 2525 SkIRect r; 2526 2527 if (paint.getStyle() == SkPaint::kFill_Style) { 2528 rect.round(&r); 2529 } else { 2530 int rad = -1; 2531 rect.roundOut(&r); 2532 if (paint.isAntiAlias()) { 2533 rad = -2; 2534 } 2535 r.inset(rad, rad); 2536 } 2537 return this->doIRect(r); 2538} 2539 2540bool SkBounder::doPath(const SkPath& path, const SkPaint& paint, bool doFill) { 2541 SkIRect r; 2542 const SkRect& bounds = path.getBounds(); 2543 2544 if (doFill) { 2545 bounds.round(&r); 2546 } else { // hairline 2547 bounds.roundOut(&r); 2548 } 2549 2550 if (paint.isAntiAlias()) { 2551 r.inset(-1, -1); 2552 } 2553 return this->doIRect(r); 2554} 2555 2556void SkBounder::commit() { 2557 // override in subclass 2558} 2559 2560//////////////////////////////////////////////////////////////////////////////////////////////// 2561 2562#include "SkPath.h" 2563#include "SkDraw.h" 2564#include "SkRegion.h" 2565#include "SkBlitter.h" 2566 2567static bool compute_bounds(const SkPath& devPath, const SkIRect* clipBounds, 2568 SkMaskFilter* filter, const SkMatrix* filterMatrix, 2569 SkIRect* bounds) { 2570 if (devPath.isEmpty()) { 2571 return false; 2572 } 2573 2574 // init our bounds from the path 2575 { 2576 SkRect pathBounds = devPath.getBounds(); 2577 pathBounds.inset(-SK_ScalarHalf, -SK_ScalarHalf); 2578 pathBounds.roundOut(bounds); 2579 } 2580 2581 SkIPoint margin = SkIPoint::Make(0, 0); 2582 if (filter) { 2583 SkASSERT(filterMatrix); 2584 2585 SkMask srcM, dstM; 2586 2587 srcM.fBounds = *bounds; 2588 srcM.fFormat = SkMask::kA8_Format; 2589 srcM.fImage = NULL; 2590 if (!filter->filterMask(&dstM, srcM, *filterMatrix, &margin)) { 2591 return false; 2592 } 2593 } 2594 2595 // (possibly) trim the bounds to reflect the clip 2596 // (plus whatever slop the filter needs) 2597 if (clipBounds) { 2598 SkIRect tmp = *clipBounds; 2599 // Ugh. Guard against gigantic margins from wacky filters. Without this 2600 // check we can request arbitrary amounts of slop beyond our visible 2601 // clip, and bring down the renderer (at least on finite RAM machines 2602 // like handsets, etc.). Need to balance this invented value between 2603 // quality of large filters like blurs, and the corresponding memory 2604 // requests. 2605 static const int MAX_MARGIN = 128; 2606 tmp.inset(-SkMin32(margin.fX, MAX_MARGIN), 2607 -SkMin32(margin.fY, MAX_MARGIN)); 2608 if (!bounds->intersect(tmp)) { 2609 return false; 2610 } 2611 } 2612 2613 return true; 2614} 2615 2616static void draw_into_mask(const SkMask& mask, const SkPath& devPath, 2617 SkPaint::Style style) { 2618 SkBitmap bm; 2619 SkDraw draw; 2620 SkRasterClip clip; 2621 SkMatrix matrix; 2622 SkPaint paint; 2623 2624 bm.setConfig(SkBitmap::kA8_Config, mask.fBounds.width(), mask.fBounds.height(), mask.fRowBytes); 2625 bm.setPixels(mask.fImage); 2626 2627 clip.setRect(SkIRect::MakeWH(mask.fBounds.width(), mask.fBounds.height())); 2628 matrix.setTranslate(-SkIntToScalar(mask.fBounds.fLeft), 2629 -SkIntToScalar(mask.fBounds.fTop)); 2630 2631 draw.fBitmap = &bm; 2632 draw.fRC = &clip; 2633 draw.fClip = &clip.bwRgn(); 2634 draw.fMatrix = &matrix; 2635 draw.fBounder = NULL; 2636 paint.setAntiAlias(true); 2637 paint.setStyle(style); 2638 draw.drawPath(devPath, paint); 2639} 2640 2641bool SkDraw::DrawToMask(const SkPath& devPath, const SkIRect* clipBounds, 2642 SkMaskFilter* filter, const SkMatrix* filterMatrix, 2643 SkMask* mask, SkMask::CreateMode mode, 2644 SkPaint::Style style) { 2645 if (SkMask::kJustRenderImage_CreateMode != mode) { 2646 if (!compute_bounds(devPath, clipBounds, filter, filterMatrix, &mask->fBounds)) 2647 return false; 2648 } 2649 2650 if (SkMask::kComputeBoundsAndRenderImage_CreateMode == mode) { 2651 mask->fFormat = SkMask::kA8_Format; 2652 mask->fRowBytes = mask->fBounds.width(); 2653 size_t size = mask->computeImageSize(); 2654 if (0 == size) { 2655 // we're too big to allocate the mask, abort 2656 return false; 2657 } 2658 mask->fImage = SkMask::AllocImage(size); 2659 memset(mask->fImage, 0, mask->computeImageSize()); 2660 } 2661 2662 if (SkMask::kJustComputeBounds_CreateMode != mode) { 2663 draw_into_mask(*mask, devPath, style); 2664 } 2665 2666 return true; 2667} 2668