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 setLocalMatrix(const SkMatrix& matrix) override { this->setMatrix(matrix); } 71 virtual void concat(const SkMatrix& matrix) override; 72 virtual void rotate(float degrees) override; 73 virtual void scale(float sx, float sy) override; 74 virtual void skew(float sx, float sy) override; 75 virtual void translate(float dx, float dy) override; 76 77 virtual bool getClipBounds(SkRect* outRect) const override; 78 virtual bool quickRejectRect(float left, float top, float right, float bottom) const override; 79 virtual bool quickRejectPath(const SkPath& path) const override; 80 virtual bool clipRect(float left, float top, float right, float bottom, 81 SkRegion::Op op) override; 82 virtual bool clipPath(const SkPath* path, SkRegion::Op op) override; 83 virtual bool clipRegion(const SkRegion* region, SkRegion::Op op) override; 84 85 virtual SkDrawFilter* getDrawFilter() override; 86 virtual void setDrawFilter(SkDrawFilter* drawFilter) override; 87 88 virtual void drawColor(int color, SkXfermode::Mode mode) override; 89 virtual void drawPaint(const SkPaint& paint) override; 90 91 virtual void drawPoint(float x, float y, const SkPaint& paint) override; 92 virtual void drawPoints(const float* points, int count, const SkPaint& paint) override; 93 virtual void drawLine(float startX, float startY, float stopX, float stopY, 94 const SkPaint& paint) override; 95 virtual void drawLines(const float* points, int count, const SkPaint& paint) override; 96 virtual void drawRect(float left, float top, float right, float bottom, 97 const SkPaint& paint) override; 98 virtual void drawRoundRect(float left, float top, float right, float bottom, 99 float rx, float ry, const SkPaint& paint) override; 100 virtual void drawCircle(float x, float y, float radius, const SkPaint& paint) override; 101 virtual void drawOval(float left, float top, float right, float bottom, 102 const SkPaint& paint) override; 103 virtual void drawArc(float left, float top, float right, float bottom, 104 float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) override; 105 virtual void drawPath(const SkPath& path, const SkPaint& paint) override; 106 virtual void drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount, 107 const float* verts, const float* tex, const int* colors, 108 const uint16_t* indices, int indexCount, const SkPaint& paint) override; 109 110 virtual void drawBitmap(const SkBitmap& bitmap, float left, float top, 111 const SkPaint* paint) override; 112 virtual void drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, 113 const SkPaint* paint) override; 114 virtual void drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop, 115 float srcRight, float srcBottom, float dstLeft, float dstTop, 116 float dstRight, float dstBottom, const SkPaint* paint) override; 117 virtual void drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight, 118 const float* vertices, const int* colors, const SkPaint* paint) override; 119 120 virtual void drawText(const uint16_t* text, const float* positions, int count, 121 const SkPaint& paint, float x, float y, 122 float boundsLeft, float boundsTop, float boundsRight, float boundsBottom, 123 float totalAdvance) override; 124 virtual void drawPosText(const uint16_t* text, const float* positions, int count, 125 int posCount, const SkPaint& paint) override; 126 virtual void drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path, 127 float hOffset, float vOffset, const SkPaint& paint) override; 128 129 virtual bool drawTextAbsolutePos() const override { return true; } 130 131private: 132 struct SaveRec { 133 int saveCount; 134 SkCanvas::SaveFlags saveFlags; 135 }; 136 137 void recordPartialSave(SkCanvas::SaveFlags flags); 138 void saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, int frameSaveCount); 139 void applyClips(const SkTArray<SkClipStack::Element>& clips); 140 141 void drawPoints(const float* points, int count, const SkPaint& paint, 142 SkCanvas::PointMode mode); 143 void drawTextDecorations(float x, float y, float length, const SkPaint& paint); 144 145 SkAutoTUnref<SkCanvas> mCanvas; 146 SkAutoTDelete<SkDeque> mSaveStack; // lazily allocated, tracks partial saves. 147}; 148 149Canvas* Canvas::create_canvas(const SkBitmap& bitmap) { 150 return new SkiaCanvas(bitmap); 151} 152 153Canvas* Canvas::create_canvas(SkCanvas* skiaCanvas) { 154 return new SkiaCanvas(skiaCanvas); 155} 156 157SkiaCanvas::SkiaCanvas(const SkBitmap& bitmap) { 158 mCanvas.reset(new SkCanvas(bitmap)); 159} 160 161// ---------------------------------------------------------------------------- 162// Canvas state operations: Replace Bitmap 163// ---------------------------------------------------------------------------- 164 165class ClipCopier : public SkCanvas::ClipVisitor { 166public: 167 ClipCopier(SkCanvas* dstCanvas) : m_dstCanvas(dstCanvas) {} 168 169 virtual void clipRect(const SkRect& rect, SkRegion::Op op, bool antialias) { 170 m_dstCanvas->clipRect(rect, op, antialias); 171 } 172 virtual void clipRRect(const SkRRect& rrect, SkRegion::Op op, bool antialias) { 173 m_dstCanvas->clipRRect(rrect, op, antialias); 174 } 175 virtual void clipPath(const SkPath& path, SkRegion::Op op, bool antialias) { 176 m_dstCanvas->clipPath(path, op, antialias); 177 } 178 179private: 180 SkCanvas* m_dstCanvas; 181}; 182 183void SkiaCanvas::setBitmap(const SkBitmap& bitmap) { 184 SkCanvas* newCanvas = new SkCanvas(bitmap); 185 SkASSERT(newCanvas); 186 187 if (!bitmap.isNull()) { 188 // Copy the canvas matrix & clip state. 189 newCanvas->setMatrix(mCanvas->getTotalMatrix()); 190 if (NULL != mCanvas->getDevice() && NULL != newCanvas->getDevice()) { 191 ClipCopier copier(newCanvas); 192 mCanvas->replayClips(&copier); 193 } 194 } 195 196 // unrefs the existing canvas 197 mCanvas.reset(newCanvas); 198 199 // clean up the old save stack 200 mSaveStack.reset(NULL); 201} 202 203// ---------------------------------------------------------------------------- 204// Canvas state operations 205// ---------------------------------------------------------------------------- 206 207bool SkiaCanvas::isOpaque() { 208 return mCanvas->getDevice()->accessBitmap(false).isOpaque(); 209} 210 211int SkiaCanvas::width() { 212 return mCanvas->getBaseLayerSize().width(); 213} 214 215int SkiaCanvas::height() { 216 return mCanvas->getBaseLayerSize().height(); 217} 218 219// ---------------------------------------------------------------------------- 220// Canvas state operations: Save (layer) 221// ---------------------------------------------------------------------------- 222 223int SkiaCanvas::getSaveCount() const { 224 return mCanvas->getSaveCount(); 225} 226 227int SkiaCanvas::save(SkCanvas::SaveFlags flags) { 228 int count = mCanvas->save(); 229 recordPartialSave(flags); 230 return count; 231} 232 233void SkiaCanvas::restore() { 234 const SaveRec* rec = (NULL == mSaveStack.get()) 235 ? NULL 236 : static_cast<SaveRec*>(mSaveStack->back()); 237 int currentSaveCount = mCanvas->getSaveCount() - 1; 238 SkASSERT(NULL == rec || currentSaveCount >= rec->saveCount); 239 240 if (NULL == rec || rec->saveCount != currentSaveCount) { 241 // Fast path - no record for this frame. 242 mCanvas->restore(); 243 return; 244 } 245 246 bool preserveMatrix = !(rec->saveFlags & SkCanvas::kMatrix_SaveFlag); 247 bool preserveClip = !(rec->saveFlags & SkCanvas::kClip_SaveFlag); 248 249 SkMatrix savedMatrix; 250 if (preserveMatrix) { 251 savedMatrix = mCanvas->getTotalMatrix(); 252 } 253 254 SkTArray<SkClipStack::Element> savedClips; 255 if (preserveClip) { 256 saveClipsForFrame(savedClips, currentSaveCount); 257 } 258 259 mCanvas->restore(); 260 261 if (preserveMatrix) { 262 mCanvas->setMatrix(savedMatrix); 263 } 264 265 if (preserveClip && !savedClips.empty()) { 266 applyClips(savedClips); 267 } 268 269 mSaveStack->pop_back(); 270} 271 272void SkiaCanvas::restoreToCount(int restoreCount) { 273 while (mCanvas->getSaveCount() > restoreCount) { 274 this->restore(); 275 } 276} 277 278int SkiaCanvas::saveLayer(float left, float top, float right, float bottom, 279 const SkPaint* paint, SkCanvas::SaveFlags flags) { 280 SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 281 int count = mCanvas->saveLayer(&bounds, paint, flags | SkCanvas::kMatrixClip_SaveFlag); 282 recordPartialSave(flags); 283 return count; 284} 285 286int SkiaCanvas::saveLayerAlpha(float left, float top, float right, float bottom, 287 int alpha, SkCanvas::SaveFlags flags) { 288 SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 289 int count = mCanvas->saveLayerAlpha(&bounds, alpha, flags | SkCanvas::kMatrixClip_SaveFlag); 290 recordPartialSave(flags); 291 return count; 292} 293 294// ---------------------------------------------------------------------------- 295// functions to emulate legacy SaveFlags (i.e. independent matrix/clip flags) 296// ---------------------------------------------------------------------------- 297 298void SkiaCanvas::recordPartialSave(SkCanvas::SaveFlags flags) { 299 // A partial save is a save operation which doesn't capture the full canvas state. 300 // (either kMatrix_SaveFlags or kClip_SaveFlag is missing). 301 302 // Mask-out non canvas state bits. 303 flags = static_cast<SkCanvas::SaveFlags>(flags & SkCanvas::kMatrixClip_SaveFlag); 304 305 if (SkCanvas::kMatrixClip_SaveFlag == flags) { 306 // not a partial save. 307 return; 308 } 309 310 if (NULL == mSaveStack.get()) { 311 mSaveStack.reset(SkNEW_ARGS(SkDeque, (sizeof(struct SaveRec), 8))); 312 } 313 314 SaveRec* rec = static_cast<SaveRec*>(mSaveStack->push_back()); 315 // Store the save counter in the SkClipStack domain. 316 // (0-based, equal to the number of save ops on the stack). 317 rec->saveCount = mCanvas->getSaveCount() - 1; 318 rec->saveFlags = flags; 319} 320 321void SkiaCanvas::saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, int frameSaveCount) { 322 SkClipStack::Iter clipIterator(*mCanvas->getClipStack(), 323 SkClipStack::Iter::kTop_IterStart); 324 while (const SkClipStack::Element* elem = clipIterator.next()) { 325 if (elem->getSaveCount() < frameSaveCount) { 326 // done with the current frame. 327 break; 328 } 329 SkASSERT(elem->getSaveCount() == frameSaveCount); 330 clips.push_back(*elem); 331 } 332} 333 334void SkiaCanvas::applyClips(const SkTArray<SkClipStack::Element>& clips) { 335 ClipCopier clipCopier(mCanvas); 336 337 // The clip stack stores clips in device space. 338 SkMatrix origMatrix = mCanvas->getTotalMatrix(); 339 mCanvas->resetMatrix(); 340 341 // We pushed the clips in reverse order. 342 for (int i = clips.count() - 1; i >= 0; --i) { 343 clips[i].replay(&clipCopier); 344 } 345 346 mCanvas->setMatrix(origMatrix); 347} 348 349// ---------------------------------------------------------------------------- 350// Canvas state operations: Matrix 351// ---------------------------------------------------------------------------- 352 353void SkiaCanvas::getMatrix(SkMatrix* outMatrix) const { 354 *outMatrix = mCanvas->getTotalMatrix(); 355} 356 357void SkiaCanvas::setMatrix(const SkMatrix& matrix) { 358 mCanvas->setMatrix(matrix); 359} 360 361void SkiaCanvas::concat(const SkMatrix& matrix) { 362 mCanvas->concat(matrix); 363} 364 365void SkiaCanvas::rotate(float degrees) { 366 mCanvas->rotate(degrees); 367} 368 369void SkiaCanvas::scale(float sx, float sy) { 370 mCanvas->scale(sx, sy); 371} 372 373void SkiaCanvas::skew(float sx, float sy) { 374 mCanvas->skew(sx, sy); 375} 376 377void SkiaCanvas::translate(float dx, float dy) { 378 mCanvas->translate(dx, dy); 379} 380 381// ---------------------------------------------------------------------------- 382// Canvas state operations: Clips 383// ---------------------------------------------------------------------------- 384 385// This function is a mirror of SkCanvas::getClipBounds except that it does 386// not outset the edge of the clip to account for anti-aliasing. There is 387// a skia bug to investigate pushing this logic into back into skia. 388// (see https://code.google.com/p/skia/issues/detail?id=1303) 389bool SkiaCanvas::getClipBounds(SkRect* outRect) const { 390 SkIRect ibounds; 391 if (!mCanvas->getClipDeviceBounds(&ibounds)) { 392 return false; 393 } 394 395 SkMatrix inverse; 396 // if we can't invert the CTM, we can't return local clip bounds 397 if (!mCanvas->getTotalMatrix().invert(&inverse)) { 398 if (outRect) { 399 outRect->setEmpty(); 400 } 401 return false; 402 } 403 404 if (NULL != outRect) { 405 SkRect r = SkRect::Make(ibounds); 406 inverse.mapRect(outRect, r); 407 } 408 return true; 409} 410 411bool SkiaCanvas::quickRejectRect(float left, float top, float right, float bottom) const { 412 SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 413 return mCanvas->quickReject(bounds); 414} 415 416bool SkiaCanvas::quickRejectPath(const SkPath& path) const { 417 return mCanvas->quickReject(path); 418} 419 420bool SkiaCanvas::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) { 421 SkRect rect = SkRect::MakeLTRB(left, top, right, bottom); 422 mCanvas->clipRect(rect, op); 423 return !mCanvas->isClipEmpty(); 424} 425 426bool SkiaCanvas::clipPath(const SkPath* path, SkRegion::Op op) { 427 mCanvas->clipPath(*path, op); 428 return !mCanvas->isClipEmpty(); 429} 430 431bool SkiaCanvas::clipRegion(const SkRegion* region, SkRegion::Op op) { 432 SkPath rgnPath; 433 if (region->getBoundaryPath(&rgnPath)) { 434 // The region is specified in device space. 435 SkMatrix savedMatrix = mCanvas->getTotalMatrix(); 436 mCanvas->resetMatrix(); 437 mCanvas->clipPath(rgnPath, op); 438 mCanvas->setMatrix(savedMatrix); 439 } else { 440 mCanvas->clipRect(SkRect::MakeEmpty(), op); 441 } 442 return !mCanvas->isClipEmpty(); 443} 444 445// ---------------------------------------------------------------------------- 446// Canvas state operations: Filters 447// ---------------------------------------------------------------------------- 448 449SkDrawFilter* SkiaCanvas::getDrawFilter() { 450 return mCanvas->getDrawFilter(); 451} 452 453void SkiaCanvas::setDrawFilter(SkDrawFilter* drawFilter) { 454 mCanvas->setDrawFilter(drawFilter); 455} 456 457// ---------------------------------------------------------------------------- 458// Canvas draw operations 459// ---------------------------------------------------------------------------- 460 461void SkiaCanvas::drawColor(int color, SkXfermode::Mode mode) { 462 mCanvas->drawColor(color, mode); 463} 464 465void SkiaCanvas::drawPaint(const SkPaint& paint) { 466 mCanvas->drawPaint(paint); 467} 468 469// ---------------------------------------------------------------------------- 470// Canvas draw operations: Geometry 471// ---------------------------------------------------------------------------- 472 473void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint, 474 SkCanvas::PointMode mode) { 475 // convert the floats into SkPoints 476 count >>= 1; // now it is the number of points 477 SkAutoSTMalloc<32, SkPoint> storage(count); 478 SkPoint* pts = storage.get(); 479 for (int i = 0; i < count; i++) { 480 pts[i].set(points[0], points[1]); 481 points += 2; 482 } 483 mCanvas->drawPoints(mode, count, pts, paint); 484} 485 486 487void SkiaCanvas::drawPoint(float x, float y, const SkPaint& paint) { 488 mCanvas->drawPoint(x, y, paint); 489} 490 491void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint) { 492 this->drawPoints(points, count, paint, SkCanvas::kPoints_PointMode); 493} 494 495void SkiaCanvas::drawLine(float startX, float startY, float stopX, float stopY, 496 const SkPaint& paint) { 497 mCanvas->drawLine(startX, startY, stopX, stopY, paint); 498} 499 500void SkiaCanvas::drawLines(const float* points, int count, const SkPaint& paint) { 501 this->drawPoints(points, count, paint, SkCanvas::kLines_PointMode); 502} 503 504void SkiaCanvas::drawRect(float left, float top, float right, float bottom, 505 const SkPaint& paint) { 506 mCanvas->drawRectCoords(left, top, right, bottom, paint); 507 508} 509 510void SkiaCanvas::drawRoundRect(float left, float top, float right, float bottom, 511 float rx, float ry, const SkPaint& paint) { 512 SkRect rect = SkRect::MakeLTRB(left, top, right, bottom); 513 mCanvas->drawRoundRect(rect, rx, ry, paint); 514} 515 516void SkiaCanvas::drawCircle(float x, float y, float radius, const SkPaint& paint) { 517 mCanvas->drawCircle(x, y, radius, paint); 518} 519 520void SkiaCanvas::drawOval(float left, float top, float right, float bottom, const SkPaint& paint) { 521 SkRect oval = SkRect::MakeLTRB(left, top, right, bottom); 522 mCanvas->drawOval(oval, paint); 523} 524 525void SkiaCanvas::drawArc(float left, float top, float right, float bottom, 526 float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) { 527 SkRect arc = SkRect::MakeLTRB(left, top, right, bottom); 528 mCanvas->drawArc(arc, startAngle, sweepAngle, useCenter, paint); 529} 530 531void SkiaCanvas::drawPath(const SkPath& path, const SkPaint& paint) { 532 mCanvas->drawPath(path, paint); 533} 534 535void SkiaCanvas::drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount, 536 const float* verts, const float* texs, const int* colors, 537 const uint16_t* indices, int indexCount, const SkPaint& paint) { 538#ifndef SK_SCALAR_IS_FLOAT 539 SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid"); 540#endif 541 const int ptCount = vertexCount >> 1; 542 mCanvas->drawVertices(vertexMode, ptCount, (SkPoint*)verts, (SkPoint*)texs, 543 (SkColor*)colors, NULL, indices, indexCount, paint); 544} 545 546// ---------------------------------------------------------------------------- 547// Canvas draw operations: Bitmaps 548// ---------------------------------------------------------------------------- 549 550void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float left, float top, const SkPaint* paint) { 551 mCanvas->drawBitmap(bitmap, left, top, paint); 552} 553 554void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, const SkPaint* paint) { 555 SkAutoCanvasRestore acr(mCanvas, true); 556 mCanvas->concat(matrix); 557 mCanvas->drawBitmap(bitmap, 0, 0, paint); 558} 559 560void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop, 561 float srcRight, float srcBottom, float dstLeft, float dstTop, 562 float dstRight, float dstBottom, const SkPaint* paint) { 563 SkRect srcRect = SkRect::MakeLTRB(srcLeft, srcTop, srcRight, srcBottom); 564 SkRect dstRect = SkRect::MakeLTRB(dstLeft, dstTop, dstRight, dstBottom); 565 mCanvas->drawBitmapRectToRect(bitmap, &srcRect, dstRect, paint); 566} 567 568void SkiaCanvas::drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight, 569 const float* vertices, const int* colors, const SkPaint* paint) { 570 571 const int ptCount = (meshWidth + 1) * (meshHeight + 1); 572 const int indexCount = meshWidth * meshHeight * 6; 573 574 /* Our temp storage holds 2 or 3 arrays. 575 texture points [ptCount * sizeof(SkPoint)] 576 optionally vertex points [ptCount * sizeof(SkPoint)] if we need a 577 copy to convert from float to fixed 578 indices [ptCount * sizeof(uint16_t)] 579 */ 580 ssize_t storageSize = ptCount * sizeof(SkPoint); // texs[] 581 storageSize += indexCount * sizeof(uint16_t); // indices[] 582 583 584#ifndef SK_SCALAR_IS_FLOAT 585 SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid"); 586#endif 587 SkAutoMalloc storage(storageSize); 588 SkPoint* texs = (SkPoint*)storage.get(); 589 uint16_t* indices = (uint16_t*)(texs + ptCount); 590 591 // cons up texture coordinates and indices 592 { 593 const SkScalar w = SkIntToScalar(bitmap.width()); 594 const SkScalar h = SkIntToScalar(bitmap.height()); 595 const SkScalar dx = w / meshWidth; 596 const SkScalar dy = h / meshHeight; 597 598 SkPoint* texsPtr = texs; 599 SkScalar y = 0; 600 for (int i = 0; i <= meshHeight; i++) { 601 if (i == meshHeight) { 602 y = h; // to ensure numerically we hit h exactly 603 } 604 SkScalar x = 0; 605 for (int j = 0; j < meshWidth; j++) { 606 texsPtr->set(x, y); 607 texsPtr += 1; 608 x += dx; 609 } 610 texsPtr->set(w, y); 611 texsPtr += 1; 612 y += dy; 613 } 614 SkASSERT(texsPtr - texs == ptCount); 615 } 616 617 // cons up indices 618 { 619 uint16_t* indexPtr = indices; 620 int index = 0; 621 for (int i = 0; i < meshHeight; i++) { 622 for (int j = 0; j < meshWidth; j++) { 623 // lower-left triangle 624 *indexPtr++ = index; 625 *indexPtr++ = index + meshWidth + 1; 626 *indexPtr++ = index + meshWidth + 2; 627 // upper-right triangle 628 *indexPtr++ = index; 629 *indexPtr++ = index + meshWidth + 2; 630 *indexPtr++ = index + 1; 631 // bump to the next cell 632 index += 1; 633 } 634 // bump to the next row 635 index += 1; 636 } 637 SkASSERT(indexPtr - indices == indexCount); 638 SkASSERT((char*)indexPtr - (char*)storage.get() == storageSize); 639 } 640 641 // double-check that we have legal indices 642#ifdef SK_DEBUG 643 { 644 for (int i = 0; i < indexCount; i++) { 645 SkASSERT((unsigned)indices[i] < (unsigned)ptCount); 646 } 647 } 648#endif 649 650 // cons-up a shader for the bitmap 651 SkPaint tmpPaint; 652 if (paint) { 653 tmpPaint = *paint; 654 } 655 SkShader* shader = SkShader::CreateBitmapShader(bitmap, 656 SkShader::kClamp_TileMode, 657 SkShader::kClamp_TileMode); 658 SkSafeUnref(tmpPaint.setShader(shader)); 659 660 mCanvas->drawVertices(SkCanvas::kTriangles_VertexMode, ptCount, (SkPoint*)vertices, 661 texs, (const SkColor*)colors, NULL, indices, 662 indexCount, tmpPaint); 663} 664 665// ---------------------------------------------------------------------------- 666// Canvas draw operations: Text 667// ---------------------------------------------------------------------------- 668 669void SkiaCanvas::drawText(const uint16_t* text, const float* positions, int count, 670 const SkPaint& paint, float x, float y, 671 float boundsLeft, float boundsTop, float boundsRight, float boundsBottom, 672 float totalAdvance) { 673 // Set align to left for drawing, as we don't want individual 674 // glyphs centered or right-aligned; the offset above takes 675 // care of all alignment. 676 SkPaint paintCopy(paint); 677 paintCopy.setTextAlign(SkPaint::kLeft_Align); 678 679 SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats); 680 mCanvas->drawPosText(text, count << 1, reinterpret_cast<const SkPoint*>(positions), paintCopy); 681} 682 683void SkiaCanvas::drawPosText(const uint16_t* text, const float* positions, int count, int posCount, 684 const SkPaint& paint) { 685 SkPoint* posPtr = posCount > 0 ? new SkPoint[posCount] : NULL; 686 int indx; 687 for (indx = 0; indx < posCount; indx++) { 688 posPtr[indx].fX = positions[indx << 1]; 689 posPtr[indx].fY = positions[(indx << 1) + 1]; 690 } 691 692 SkPaint paintCopy(paint); 693 paintCopy.setTextEncoding(SkPaint::kUTF16_TextEncoding); 694 mCanvas->drawPosText(text, count, posPtr, paintCopy); 695 696 delete[] posPtr; 697} 698 699void SkiaCanvas::drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path, 700 float hOffset, float vOffset, const SkPaint& paint) { 701 mCanvas->drawTextOnPathHV(glyphs, count << 1, path, hOffset, vOffset, paint); 702} 703 704} // namespace android 705