SkiaCanvas.cpp revision c294d128d03bc9a9982b273a82516c04583438cc
1/* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "Canvas.h" 18 19#include <SkCanvas.h> 20#include <SkClipStack.h> 21#include <SkDevice.h> 22#include <SkDeque.h> 23#include <SkDrawFilter.h> 24#include <SkGraphics.h> 25#include <SkShader.h> 26#include <SkTArray.h> 27#include <SkTemplates.h> 28 29namespace android { 30 31// Holds an SkCanvas reference plus additional native data. 32class SkiaCanvas : public Canvas { 33public: 34 explicit SkiaCanvas(const SkBitmap& bitmap); 35 36 /** 37 * Create a new SkiaCanvas. 38 * 39 * @param canvas SkCanvas to handle calls made to this SkiaCanvas. Must 40 * not be NULL. This constructor will ref() the SkCanvas, and unref() 41 * it in its destructor. 42 */ 43 explicit SkiaCanvas(SkCanvas* canvas) : mCanvas(canvas) { 44 SkASSERT(canvas); 45 canvas->ref(); 46 } 47 48 virtual SkCanvas* asSkCanvas() override { 49 return mCanvas.get(); 50 } 51 52 virtual void setBitmap(const SkBitmap& bitmap) override; 53 54 virtual bool isOpaque() override; 55 virtual int width() override; 56 virtual int height() override; 57 58 virtual int getSaveCount() const override; 59 virtual int save(SkCanvas::SaveFlags flags) override; 60 virtual void restore() override; 61 virtual void restoreToCount(int saveCount) override; 62 63 virtual int saveLayer(float left, float top, float right, float bottom, 64 const SkPaint* paint, SkCanvas::SaveFlags flags) override; 65 virtual int saveLayerAlpha(float left, float top, float right, float bottom, 66 int alpha, SkCanvas::SaveFlags flags) override; 67 68 virtual void getMatrix(SkMatrix* outMatrix) const override; 69 virtual void setMatrix(const SkMatrix& matrix) override; 70 virtual void concat(const SkMatrix& matrix) override; 71 virtual void rotate(float degrees) override; 72 virtual void scale(float sx, float sy) override; 73 virtual void skew(float sx, float sy) override; 74 virtual void translate(float dx, float dy) override; 75 76 virtual bool getClipBounds(SkRect* outRect) const override; 77 virtual bool quickRejectRect(float left, float top, float right, float bottom) const override; 78 virtual bool quickRejectPath(const SkPath& path) const override; 79 virtual bool clipRect(float left, float top, float right, float bottom, 80 SkRegion::Op op) override; 81 virtual bool clipPath(const SkPath* path, SkRegion::Op op) override; 82 virtual bool clipRegion(const SkRegion* region, SkRegion::Op op) override; 83 84 virtual SkDrawFilter* getDrawFilter() override; 85 virtual void setDrawFilter(SkDrawFilter* drawFilter) override; 86 87 virtual void drawColor(int color, SkXfermode::Mode mode) override; 88 virtual void drawPaint(const SkPaint& paint) override; 89 90 virtual void drawPoint(float x, float y, const SkPaint& paint) override; 91 virtual void drawPoints(const float* points, int count, const SkPaint& paint) override; 92 virtual void drawLine(float startX, float startY, float stopX, float stopY, 93 const SkPaint& paint) override; 94 virtual void drawLines(const float* points, int count, const SkPaint& paint) override; 95 virtual void drawRect(float left, float top, float right, float bottom, 96 const SkPaint& paint) override; 97 virtual void drawRoundRect(float left, float top, float right, float bottom, 98 float rx, float ry, const SkPaint& paint) override; 99 virtual void drawCircle(float x, float y, float radius, const SkPaint& paint) override; 100 virtual void drawOval(float left, float top, float right, float bottom, 101 const SkPaint& paint) override; 102 virtual void drawArc(float left, float top, float right, float bottom, 103 float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) override; 104 virtual void drawPath(const SkPath& path, const SkPaint& paint) override; 105 virtual void drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount, 106 const float* verts, const float* tex, const int* colors, 107 const uint16_t* indices, int indexCount, const SkPaint& paint) override; 108 109 virtual void drawBitmap(const SkBitmap& bitmap, float left, float top, 110 const SkPaint* paint) override; 111 virtual void drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, 112 const SkPaint* paint) override; 113 virtual void drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop, 114 float srcRight, float srcBottom, float dstLeft, float dstTop, 115 float dstRight, float dstBottom, const SkPaint* paint) override; 116 virtual void drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight, 117 const float* vertices, const int* colors, const SkPaint* paint) override; 118 119 virtual void drawText(const uint16_t* text, const float* positions, int count, 120 const SkPaint& paint, float x, float y, 121 float boundsLeft, float boundsTop, float boundsRight, float boundsBottom, 122 float totalAdvance) override; 123 virtual void drawPosText(const uint16_t* text, const float* positions, int count, 124 int posCount, const SkPaint& paint) override; 125 virtual void drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path, 126 float hOffset, float vOffset, const SkPaint& paint) override; 127 128 virtual bool drawTextAbsolutePos() const override { return true; } 129 130private: 131 struct SaveRec { 132 int saveCount; 133 SkCanvas::SaveFlags saveFlags; 134 }; 135 136 void recordPartialSave(SkCanvas::SaveFlags flags); 137 void saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, int frameSaveCount); 138 void applyClips(const SkTArray<SkClipStack::Element>& clips); 139 140 void drawPoints(const float* points, int count, const SkPaint& paint, 141 SkCanvas::PointMode mode); 142 void drawTextDecorations(float x, float y, float length, const SkPaint& paint); 143 144 SkAutoTUnref<SkCanvas> mCanvas; 145 SkAutoTDelete<SkDeque> mSaveStack; // lazily allocated, tracks partial saves. 146}; 147 148Canvas* Canvas::create_canvas(const SkBitmap& bitmap) { 149 return new SkiaCanvas(bitmap); 150} 151 152Canvas* Canvas::create_canvas(SkCanvas* skiaCanvas) { 153 return new SkiaCanvas(skiaCanvas); 154} 155 156SkiaCanvas::SkiaCanvas(const SkBitmap& bitmap) { 157 mCanvas.reset(new SkCanvas(bitmap)); 158} 159 160// ---------------------------------------------------------------------------- 161// Canvas state operations: Replace Bitmap 162// ---------------------------------------------------------------------------- 163 164class ClipCopier : public SkCanvas::ClipVisitor { 165public: 166 ClipCopier(SkCanvas* dstCanvas) : m_dstCanvas(dstCanvas) {} 167 168 virtual void clipRect(const SkRect& rect, SkRegion::Op op, bool antialias) { 169 m_dstCanvas->clipRect(rect, op, antialias); 170 } 171 virtual void clipRRect(const SkRRect& rrect, SkRegion::Op op, bool antialias) { 172 m_dstCanvas->clipRRect(rrect, op, antialias); 173 } 174 virtual void clipPath(const SkPath& path, SkRegion::Op op, bool antialias) { 175 m_dstCanvas->clipPath(path, op, antialias); 176 } 177 178private: 179 SkCanvas* m_dstCanvas; 180}; 181 182void SkiaCanvas::setBitmap(const SkBitmap& bitmap) { 183 SkCanvas* newCanvas = new SkCanvas(bitmap); 184 SkASSERT(newCanvas); 185 186 if (!bitmap.isNull()) { 187 // Copy the canvas matrix & clip state. 188 newCanvas->setMatrix(mCanvas->getTotalMatrix()); 189 if (NULL != mCanvas->getDevice() && NULL != newCanvas->getDevice()) { 190 ClipCopier copier(newCanvas); 191 mCanvas->replayClips(&copier); 192 } 193 } 194 195 // unrefs the existing canvas 196 mCanvas.reset(newCanvas); 197 198 // clean up the old save stack 199 mSaveStack.reset(NULL); 200} 201 202// ---------------------------------------------------------------------------- 203// Canvas state operations 204// ---------------------------------------------------------------------------- 205 206bool SkiaCanvas::isOpaque() { 207 return mCanvas->getDevice()->accessBitmap(false).isOpaque(); 208} 209 210int SkiaCanvas::width() { 211 return mCanvas->getBaseLayerSize().width(); 212} 213 214int SkiaCanvas::height() { 215 return mCanvas->getBaseLayerSize().height(); 216} 217 218// ---------------------------------------------------------------------------- 219// Canvas state operations: Save (layer) 220// ---------------------------------------------------------------------------- 221 222int SkiaCanvas::getSaveCount() const { 223 return mCanvas->getSaveCount(); 224} 225 226int SkiaCanvas::save(SkCanvas::SaveFlags flags) { 227 int count = mCanvas->save(); 228 recordPartialSave(flags); 229 return count; 230} 231 232void SkiaCanvas::restore() { 233 const SaveRec* rec = (NULL == mSaveStack.get()) 234 ? NULL 235 : static_cast<SaveRec*>(mSaveStack->back()); 236 int currentSaveCount = mCanvas->getSaveCount() - 1; 237 SkASSERT(NULL == rec || currentSaveCount >= rec->saveCount); 238 239 if (NULL == rec || rec->saveCount != currentSaveCount) { 240 // Fast path - no record for this frame. 241 mCanvas->restore(); 242 return; 243 } 244 245 bool preserveMatrix = !(rec->saveFlags & SkCanvas::kMatrix_SaveFlag); 246 bool preserveClip = !(rec->saveFlags & SkCanvas::kClip_SaveFlag); 247 248 SkMatrix savedMatrix; 249 if (preserveMatrix) { 250 savedMatrix = mCanvas->getTotalMatrix(); 251 } 252 253 SkTArray<SkClipStack::Element> savedClips; 254 if (preserveClip) { 255 saveClipsForFrame(savedClips, currentSaveCount); 256 } 257 258 mCanvas->restore(); 259 260 if (preserveMatrix) { 261 mCanvas->setMatrix(savedMatrix); 262 } 263 264 if (preserveClip && !savedClips.empty()) { 265 applyClips(savedClips); 266 } 267 268 mSaveStack->pop_back(); 269} 270 271void SkiaCanvas::restoreToCount(int restoreCount) { 272 while (mCanvas->getSaveCount() > restoreCount) { 273 this->restore(); 274 } 275} 276 277int SkiaCanvas::saveLayer(float left, float top, float right, float bottom, 278 const SkPaint* paint, SkCanvas::SaveFlags flags) { 279 SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 280 int count = mCanvas->saveLayer(&bounds, paint, flags | SkCanvas::kMatrixClip_SaveFlag); 281 recordPartialSave(flags); 282 return count; 283} 284 285int SkiaCanvas::saveLayerAlpha(float left, float top, float right, float bottom, 286 int alpha, SkCanvas::SaveFlags flags) { 287 SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 288 int count = mCanvas->saveLayerAlpha(&bounds, alpha, flags | SkCanvas::kMatrixClip_SaveFlag); 289 recordPartialSave(flags); 290 return count; 291} 292 293// ---------------------------------------------------------------------------- 294// functions to emulate legacy SaveFlags (i.e. independent matrix/clip flags) 295// ---------------------------------------------------------------------------- 296 297void SkiaCanvas::recordPartialSave(SkCanvas::SaveFlags flags) { 298 // A partial save is a save operation which doesn't capture the full canvas state. 299 // (either kMatrix_SaveFlags or kClip_SaveFlag is missing). 300 301 // Mask-out non canvas state bits. 302 flags = static_cast<SkCanvas::SaveFlags>(flags & SkCanvas::kMatrixClip_SaveFlag); 303 304 if (SkCanvas::kMatrixClip_SaveFlag == flags) { 305 // not a partial save. 306 return; 307 } 308 309 if (NULL == mSaveStack.get()) { 310 mSaveStack.reset(SkNEW_ARGS(SkDeque, (sizeof(struct SaveRec), 8))); 311 } 312 313 SaveRec* rec = static_cast<SaveRec*>(mSaveStack->push_back()); 314 // Store the save counter in the SkClipStack domain. 315 // (0-based, equal to the number of save ops on the stack). 316 rec->saveCount = mCanvas->getSaveCount() - 1; 317 rec->saveFlags = flags; 318} 319 320void SkiaCanvas::saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, int frameSaveCount) { 321 SkClipStack::Iter clipIterator(*mCanvas->getClipStack(), 322 SkClipStack::Iter::kTop_IterStart); 323 while (const SkClipStack::Element* elem = clipIterator.next()) { 324 if (elem->getSaveCount() < frameSaveCount) { 325 // done with the current frame. 326 break; 327 } 328 SkASSERT(elem->getSaveCount() == frameSaveCount); 329 clips.push_back(*elem); 330 } 331} 332 333void SkiaCanvas::applyClips(const SkTArray<SkClipStack::Element>& clips) { 334 ClipCopier clipCopier(mCanvas); 335 336 // The clip stack stores clips in device space. 337 SkMatrix origMatrix = mCanvas->getTotalMatrix(); 338 mCanvas->resetMatrix(); 339 340 // We pushed the clips in reverse order. 341 for (int i = clips.count() - 1; i >= 0; --i) { 342 clips[i].replay(&clipCopier); 343 } 344 345 mCanvas->setMatrix(origMatrix); 346} 347 348// ---------------------------------------------------------------------------- 349// Canvas state operations: Matrix 350// ---------------------------------------------------------------------------- 351 352void SkiaCanvas::getMatrix(SkMatrix* outMatrix) const { 353 *outMatrix = mCanvas->getTotalMatrix(); 354} 355 356void SkiaCanvas::setMatrix(const SkMatrix& matrix) { 357 mCanvas->setMatrix(matrix); 358} 359 360void SkiaCanvas::concat(const SkMatrix& matrix) { 361 mCanvas->concat(matrix); 362} 363 364void SkiaCanvas::rotate(float degrees) { 365 mCanvas->rotate(degrees); 366} 367 368void SkiaCanvas::scale(float sx, float sy) { 369 mCanvas->scale(sx, sy); 370} 371 372void SkiaCanvas::skew(float sx, float sy) { 373 mCanvas->skew(sx, sy); 374} 375 376void SkiaCanvas::translate(float dx, float dy) { 377 mCanvas->translate(dx, dy); 378} 379 380// ---------------------------------------------------------------------------- 381// Canvas state operations: Clips 382// ---------------------------------------------------------------------------- 383 384// This function is a mirror of SkCanvas::getClipBounds except that it does 385// not outset the edge of the clip to account for anti-aliasing. There is 386// a skia bug to investigate pushing this logic into back into skia. 387// (see https://code.google.com/p/skia/issues/detail?id=1303) 388bool SkiaCanvas::getClipBounds(SkRect* outRect) const { 389 SkIRect ibounds; 390 if (!mCanvas->getClipDeviceBounds(&ibounds)) { 391 return false; 392 } 393 394 SkMatrix inverse; 395 // if we can't invert the CTM, we can't return local clip bounds 396 if (!mCanvas->getTotalMatrix().invert(&inverse)) { 397 if (outRect) { 398 outRect->setEmpty(); 399 } 400 return false; 401 } 402 403 if (NULL != outRect) { 404 SkRect r = SkRect::Make(ibounds); 405 inverse.mapRect(outRect, r); 406 } 407 return true; 408} 409 410bool SkiaCanvas::quickRejectRect(float left, float top, float right, float bottom) const { 411 SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 412 return mCanvas->quickReject(bounds); 413} 414 415bool SkiaCanvas::quickRejectPath(const SkPath& path) const { 416 return mCanvas->quickReject(path); 417} 418 419bool SkiaCanvas::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) { 420 SkRect rect = SkRect::MakeLTRB(left, top, right, bottom); 421 mCanvas->clipRect(rect, op); 422 return mCanvas->isClipEmpty(); 423} 424 425bool SkiaCanvas::clipPath(const SkPath* path, SkRegion::Op op) { 426 mCanvas->clipPath(*path, op); 427 return mCanvas->isClipEmpty(); 428} 429 430bool SkiaCanvas::clipRegion(const SkRegion* region, SkRegion::Op op) { 431 SkPath rgnPath; 432 if (region->getBoundaryPath(&rgnPath)) { 433 // The region is specified in device space. 434 SkMatrix savedMatrix = mCanvas->getTotalMatrix(); 435 mCanvas->resetMatrix(); 436 mCanvas->clipPath(rgnPath, op); 437 mCanvas->setMatrix(savedMatrix); 438 } else { 439 mCanvas->clipRect(SkRect::MakeEmpty(), op); 440 } 441 return mCanvas->isClipEmpty(); 442} 443 444// ---------------------------------------------------------------------------- 445// Canvas state operations: Filters 446// ---------------------------------------------------------------------------- 447 448SkDrawFilter* SkiaCanvas::getDrawFilter() { 449 return mCanvas->getDrawFilter(); 450} 451 452void SkiaCanvas::setDrawFilter(SkDrawFilter* drawFilter) { 453 mCanvas->setDrawFilter(drawFilter); 454} 455 456// ---------------------------------------------------------------------------- 457// Canvas draw operations 458// ---------------------------------------------------------------------------- 459 460void SkiaCanvas::drawColor(int color, SkXfermode::Mode mode) { 461 mCanvas->drawColor(color, mode); 462} 463 464void SkiaCanvas::drawPaint(const SkPaint& paint) { 465 mCanvas->drawPaint(paint); 466} 467 468// ---------------------------------------------------------------------------- 469// Canvas draw operations: Geometry 470// ---------------------------------------------------------------------------- 471 472void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint, 473 SkCanvas::PointMode mode) { 474 // convert the floats into SkPoints 475 count >>= 1; // now it is the number of points 476 SkAutoSTMalloc<32, SkPoint> storage(count); 477 SkPoint* pts = storage.get(); 478 for (int i = 0; i < count; i++) { 479 pts[i].set(points[0], points[1]); 480 points += 2; 481 } 482 mCanvas->drawPoints(mode, count, pts, paint); 483} 484 485 486void SkiaCanvas::drawPoint(float x, float y, const SkPaint& paint) { 487 mCanvas->drawPoint(x, y, paint); 488} 489 490void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint) { 491 this->drawPoints(points, count, paint, SkCanvas::kPoints_PointMode); 492} 493 494void SkiaCanvas::drawLine(float startX, float startY, float stopX, float stopY, 495 const SkPaint& paint) { 496 mCanvas->drawLine(startX, startY, stopX, stopY, paint); 497} 498 499void SkiaCanvas::drawLines(const float* points, int count, const SkPaint& paint) { 500 this->drawPoints(points, count, paint, SkCanvas::kLines_PointMode); 501} 502 503void SkiaCanvas::drawRect(float left, float top, float right, float bottom, 504 const SkPaint& paint) { 505 mCanvas->drawRectCoords(left, top, right, bottom, paint); 506 507} 508 509void SkiaCanvas::drawRoundRect(float left, float top, float right, float bottom, 510 float rx, float ry, const SkPaint& paint) { 511 SkRect rect = SkRect::MakeLTRB(left, top, right, bottom); 512 mCanvas->drawRoundRect(rect, rx, ry, paint); 513} 514 515void SkiaCanvas::drawCircle(float x, float y, float radius, const SkPaint& paint) { 516 mCanvas->drawCircle(x, y, radius, paint); 517} 518 519void SkiaCanvas::drawOval(float left, float top, float right, float bottom, const SkPaint& paint) { 520 SkRect oval = SkRect::MakeLTRB(left, top, right, bottom); 521 mCanvas->drawOval(oval, paint); 522} 523 524void SkiaCanvas::drawArc(float left, float top, float right, float bottom, 525 float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) { 526 SkRect arc = SkRect::MakeLTRB(left, top, right, bottom); 527 mCanvas->drawArc(arc, startAngle, sweepAngle, useCenter, paint); 528} 529 530void SkiaCanvas::drawPath(const SkPath& path, const SkPaint& paint) { 531 mCanvas->drawPath(path, paint); 532} 533 534void SkiaCanvas::drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount, 535 const float* verts, const float* texs, const int* colors, 536 const uint16_t* indices, int indexCount, const SkPaint& paint) { 537#ifndef SK_SCALAR_IS_FLOAT 538 SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid"); 539#endif 540 const int ptCount = vertexCount >> 1; 541 mCanvas->drawVertices(vertexMode, ptCount, (SkPoint*)verts, (SkPoint*)texs, 542 (SkColor*)colors, NULL, indices, indexCount, paint); 543} 544 545// ---------------------------------------------------------------------------- 546// Canvas draw operations: Bitmaps 547// ---------------------------------------------------------------------------- 548 549void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float left, float top, const SkPaint* paint) { 550 mCanvas->drawBitmap(bitmap, left, top, paint); 551} 552 553void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, const SkPaint* paint) { 554 SkAutoCanvasRestore acr(mCanvas, true); 555 mCanvas->concat(matrix); 556 mCanvas->drawBitmap(bitmap, 0, 0, paint); 557} 558 559void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop, 560 float srcRight, float srcBottom, float dstLeft, float dstTop, 561 float dstRight, float dstBottom, const SkPaint* paint) { 562 SkRect srcRect = SkRect::MakeLTRB(srcLeft, srcTop, srcRight, srcBottom); 563 SkRect dstRect = SkRect::MakeLTRB(dstLeft, dstTop, dstRight, dstBottom); 564 mCanvas->drawBitmapRectToRect(bitmap, &srcRect, dstRect, paint); 565} 566 567void SkiaCanvas::drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight, 568 const float* vertices, const int* colors, const SkPaint* paint) { 569 570 const int ptCount = (meshWidth + 1) * (meshHeight + 1); 571 const int indexCount = meshWidth * meshHeight * 6; 572 573 /* Our temp storage holds 2 or 3 arrays. 574 texture points [ptCount * sizeof(SkPoint)] 575 optionally vertex points [ptCount * sizeof(SkPoint)] if we need a 576 copy to convert from float to fixed 577 indices [ptCount * sizeof(uint16_t)] 578 */ 579 ssize_t storageSize = ptCount * sizeof(SkPoint); // texs[] 580 storageSize += indexCount * sizeof(uint16_t); // indices[] 581 582 583#ifndef SK_SCALAR_IS_FLOAT 584 SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid"); 585#endif 586 SkAutoMalloc storage(storageSize); 587 SkPoint* texs = (SkPoint*)storage.get(); 588 uint16_t* indices = (uint16_t*)(texs + ptCount); 589 590 // cons up texture coordinates and indices 591 { 592 const SkScalar w = SkIntToScalar(bitmap.width()); 593 const SkScalar h = SkIntToScalar(bitmap.height()); 594 const SkScalar dx = w / meshWidth; 595 const SkScalar dy = h / meshHeight; 596 597 SkPoint* texsPtr = texs; 598 SkScalar y = 0; 599 for (int i = 0; i <= meshHeight; i++) { 600 if (i == meshHeight) { 601 y = h; // to ensure numerically we hit h exactly 602 } 603 SkScalar x = 0; 604 for (int j = 0; j < meshWidth; j++) { 605 texsPtr->set(x, y); 606 texsPtr += 1; 607 x += dx; 608 } 609 texsPtr->set(w, y); 610 texsPtr += 1; 611 y += dy; 612 } 613 SkASSERT(texsPtr - texs == ptCount); 614 } 615 616 // cons up indices 617 { 618 uint16_t* indexPtr = indices; 619 int index = 0; 620 for (int i = 0; i < meshHeight; i++) { 621 for (int j = 0; j < meshWidth; j++) { 622 // lower-left triangle 623 *indexPtr++ = index; 624 *indexPtr++ = index + meshWidth + 1; 625 *indexPtr++ = index + meshWidth + 2; 626 // upper-right triangle 627 *indexPtr++ = index; 628 *indexPtr++ = index + meshWidth + 2; 629 *indexPtr++ = index + 1; 630 // bump to the next cell 631 index += 1; 632 } 633 // bump to the next row 634 index += 1; 635 } 636 SkASSERT(indexPtr - indices == indexCount); 637 SkASSERT((char*)indexPtr - (char*)storage.get() == storageSize); 638 } 639 640 // double-check that we have legal indices 641#ifdef SK_DEBUG 642 { 643 for (int i = 0; i < indexCount; i++) { 644 SkASSERT((unsigned)indices[i] < (unsigned)ptCount); 645 } 646 } 647#endif 648 649 // cons-up a shader for the bitmap 650 SkPaint tmpPaint; 651 if (paint) { 652 tmpPaint = *paint; 653 } 654 SkShader* shader = SkShader::CreateBitmapShader(bitmap, 655 SkShader::kClamp_TileMode, 656 SkShader::kClamp_TileMode); 657 SkSafeUnref(tmpPaint.setShader(shader)); 658 659 mCanvas->drawVertices(SkCanvas::kTriangles_VertexMode, ptCount, (SkPoint*)vertices, 660 texs, (const SkColor*)colors, NULL, indices, 661 indexCount, tmpPaint); 662} 663 664// ---------------------------------------------------------------------------- 665// Canvas draw operations: Text 666// ---------------------------------------------------------------------------- 667 668void SkiaCanvas::drawText(const uint16_t* text, const float* positions, int count, 669 const SkPaint& paint, float x, float y, 670 float boundsLeft, float boundsTop, float boundsRight, float boundsBottom, 671 float totalAdvance) { 672 // Set align to left for drawing, as we don't want individual 673 // glyphs centered or right-aligned; the offset above takes 674 // care of all alignment. 675 SkPaint paintCopy(paint); 676 paintCopy.setTextAlign(SkPaint::kLeft_Align); 677 678 SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats); 679 mCanvas->drawPosText(text, count << 1, reinterpret_cast<const SkPoint*>(positions), paintCopy); 680} 681 682void SkiaCanvas::drawPosText(const uint16_t* text, const float* positions, int count, int posCount, 683 const SkPaint& paint) { 684 SkPoint* posPtr = posCount > 0 ? new SkPoint[posCount] : NULL; 685 int indx; 686 for (indx = 0; indx < posCount; indx++) { 687 posPtr[indx].fX = positions[indx << 1]; 688 posPtr[indx].fY = positions[(indx << 1) + 1]; 689 } 690 691 SkPaint paintCopy(paint); 692 paintCopy.setTextEncoding(SkPaint::kUTF16_TextEncoding); 693 mCanvas->drawPosText(text, count, posPtr, paintCopy); 694 695 delete[] posPtr; 696} 697 698void SkiaCanvas::drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path, 699 float hOffset, float vOffset, const SkPaint& paint) { 700 mCanvas->drawTextOnPathHV(glyphs, count, path, hOffset, vOffset, paint); 701} 702 703} // namespace android 704