SkiaCanvas.cpp revision 6578a989566e585eee053095dc80e2552e125db2
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 void setHighContrastText(bool highContrastText) override { 59 mHighContrastText = highContrastText; 60 } 61 virtual bool isHighContrastText() override { return mHighContrastText; } 62 63 virtual int getSaveCount() const override; 64 virtual int save(SkCanvas::SaveFlags flags) override; 65 virtual void restore() override; 66 virtual void restoreToCount(int saveCount) override; 67 68 virtual int saveLayer(float left, float top, float right, float bottom, 69 const SkPaint* paint, SkCanvas::SaveFlags flags) override; 70 virtual int saveLayerAlpha(float left, float top, float right, float bottom, 71 int alpha, SkCanvas::SaveFlags flags) override; 72 73 virtual void getMatrix(SkMatrix* outMatrix) const override; 74 virtual void setMatrix(const SkMatrix& matrix) override; 75 virtual void setLocalMatrix(const SkMatrix& matrix) override { this->setMatrix(matrix); } 76 virtual void concat(const SkMatrix& matrix) override; 77 virtual void rotate(float degrees) override; 78 virtual void scale(float sx, float sy) override; 79 virtual void skew(float sx, float sy) override; 80 virtual void translate(float dx, float dy) override; 81 82 virtual bool getClipBounds(SkRect* outRect) const override; 83 virtual bool quickRejectRect(float left, float top, float right, float bottom) const override; 84 virtual bool quickRejectPath(const SkPath& path) const override; 85 virtual bool clipRect(float left, float top, float right, float bottom, 86 SkRegion::Op op) override; 87 virtual bool clipPath(const SkPath* path, SkRegion::Op op) override; 88 virtual bool clipRegion(const SkRegion* region, SkRegion::Op op) override; 89 90 virtual SkDrawFilter* getDrawFilter() override; 91 virtual void setDrawFilter(SkDrawFilter* drawFilter) override; 92 93 virtual void drawColor(int color, SkXfermode::Mode mode) override; 94 virtual void drawPaint(const SkPaint& paint) override; 95 96 virtual void drawPoint(float x, float y, const SkPaint& paint) override; 97 virtual void drawPoints(const float* points, int count, const SkPaint& paint) override; 98 virtual void drawLine(float startX, float startY, float stopX, float stopY, 99 const SkPaint& paint) override; 100 virtual void drawLines(const float* points, int count, const SkPaint& paint) override; 101 virtual void drawRect(float left, float top, float right, float bottom, 102 const SkPaint& paint) override; 103 virtual void drawRegion(const SkRegion& region, const SkPaint& paint) override; 104 virtual void drawRoundRect(float left, float top, float right, float bottom, 105 float rx, float ry, const SkPaint& paint) override; 106 virtual void drawCircle(float x, float y, float radius, const SkPaint& paint) override; 107 virtual void drawOval(float left, float top, float right, float bottom, 108 const SkPaint& paint) override; 109 virtual void drawArc(float left, float top, float right, float bottom, 110 float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) override; 111 virtual void drawPath(const SkPath& path, const SkPaint& paint) override; 112 virtual void drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount, 113 const float* verts, const float* tex, const int* colors, 114 const uint16_t* indices, int indexCount, const SkPaint& paint) override; 115 116 virtual void drawBitmap(const SkBitmap& bitmap, float left, float top, 117 const SkPaint* paint) override; 118 virtual void drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, 119 const SkPaint* paint) override; 120 virtual void drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop, 121 float srcRight, float srcBottom, float dstLeft, float dstTop, 122 float dstRight, float dstBottom, const SkPaint* paint) override; 123 virtual void drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight, 124 const float* vertices, const int* colors, const SkPaint* paint) override; 125 126 virtual void drawText(const uint16_t* text, const float* positions, int count, 127 const SkPaint& paint, float x, float y, 128 float boundsLeft, float boundsTop, float boundsRight, float boundsBottom, 129 float totalAdvance) override; 130 virtual void drawPosText(const uint16_t* text, const float* positions, int count, 131 int posCount, const SkPaint& paint) override; 132 virtual void drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path, 133 float hOffset, float vOffset, const SkPaint& paint) override; 134 135 virtual bool drawTextAbsolutePos() const override { return true; } 136 137private: 138 struct SaveRec { 139 int saveCount; 140 SkCanvas::SaveFlags saveFlags; 141 }; 142 143 bool mHighContrastText = false; 144 145 void recordPartialSave(SkCanvas::SaveFlags flags); 146 void saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, int frameSaveCount); 147 void applyClips(const SkTArray<SkClipStack::Element>& clips); 148 149 void drawPoints(const float* points, int count, const SkPaint& paint, 150 SkCanvas::PointMode mode); 151 void drawTextDecorations(float x, float y, float length, const SkPaint& paint); 152 153 SkAutoTUnref<SkCanvas> mCanvas; 154 SkAutoTDelete<SkDeque> mSaveStack; // lazily allocated, tracks partial saves. 155}; 156 157Canvas* Canvas::create_canvas(const SkBitmap& bitmap) { 158 return new SkiaCanvas(bitmap); 159} 160 161Canvas* Canvas::create_canvas(SkCanvas* skiaCanvas) { 162 return new SkiaCanvas(skiaCanvas); 163} 164 165SkiaCanvas::SkiaCanvas(const SkBitmap& bitmap) { 166 mCanvas.reset(new SkCanvas(bitmap)); 167} 168 169// ---------------------------------------------------------------------------- 170// Canvas state operations: Replace Bitmap 171// ---------------------------------------------------------------------------- 172 173class ClipCopier : public SkCanvas::ClipVisitor { 174public: 175 ClipCopier(SkCanvas* dstCanvas) : m_dstCanvas(dstCanvas) {} 176 177 virtual void clipRect(const SkRect& rect, SkRegion::Op op, bool antialias) { 178 m_dstCanvas->clipRect(rect, op, antialias); 179 } 180 virtual void clipRRect(const SkRRect& rrect, SkRegion::Op op, bool antialias) { 181 m_dstCanvas->clipRRect(rrect, op, antialias); 182 } 183 virtual void clipPath(const SkPath& path, SkRegion::Op op, bool antialias) { 184 m_dstCanvas->clipPath(path, op, antialias); 185 } 186 187private: 188 SkCanvas* m_dstCanvas; 189}; 190 191void SkiaCanvas::setBitmap(const SkBitmap& bitmap) { 192 SkCanvas* newCanvas = new SkCanvas(bitmap); 193 SkASSERT(newCanvas); 194 195 if (!bitmap.isNull()) { 196 // Copy the canvas matrix & clip state. 197 newCanvas->setMatrix(mCanvas->getTotalMatrix()); 198 if (NULL != mCanvas->getDevice() && NULL != newCanvas->getDevice()) { 199 ClipCopier copier(newCanvas); 200 mCanvas->replayClips(&copier); 201 } 202 } 203 204 // unrefs the existing canvas 205 mCanvas.reset(newCanvas); 206 207 // clean up the old save stack 208 mSaveStack.reset(NULL); 209} 210 211// ---------------------------------------------------------------------------- 212// Canvas state operations 213// ---------------------------------------------------------------------------- 214 215bool SkiaCanvas::isOpaque() { 216 return mCanvas->getDevice()->accessBitmap(false).isOpaque(); 217} 218 219int SkiaCanvas::width() { 220 return mCanvas->getBaseLayerSize().width(); 221} 222 223int SkiaCanvas::height() { 224 return mCanvas->getBaseLayerSize().height(); 225} 226 227// ---------------------------------------------------------------------------- 228// Canvas state operations: Save (layer) 229// ---------------------------------------------------------------------------- 230 231int SkiaCanvas::getSaveCount() const { 232 return mCanvas->getSaveCount(); 233} 234 235int SkiaCanvas::save(SkCanvas::SaveFlags flags) { 236 int count = mCanvas->save(); 237 recordPartialSave(flags); 238 return count; 239} 240 241void SkiaCanvas::restore() { 242 const SaveRec* rec = (NULL == mSaveStack.get()) 243 ? NULL 244 : static_cast<SaveRec*>(mSaveStack->back()); 245 int currentSaveCount = mCanvas->getSaveCount() - 1; 246 SkASSERT(NULL == rec || currentSaveCount >= rec->saveCount); 247 248 if (NULL == rec || rec->saveCount != currentSaveCount) { 249 // Fast path - no record for this frame. 250 mCanvas->restore(); 251 return; 252 } 253 254 bool preserveMatrix = !(rec->saveFlags & SkCanvas::kMatrix_SaveFlag); 255 bool preserveClip = !(rec->saveFlags & SkCanvas::kClip_SaveFlag); 256 257 SkMatrix savedMatrix; 258 if (preserveMatrix) { 259 savedMatrix = mCanvas->getTotalMatrix(); 260 } 261 262 SkTArray<SkClipStack::Element> savedClips; 263 if (preserveClip) { 264 saveClipsForFrame(savedClips, currentSaveCount); 265 } 266 267 mCanvas->restore(); 268 269 if (preserveMatrix) { 270 mCanvas->setMatrix(savedMatrix); 271 } 272 273 if (preserveClip && !savedClips.empty()) { 274 applyClips(savedClips); 275 } 276 277 mSaveStack->pop_back(); 278} 279 280void SkiaCanvas::restoreToCount(int restoreCount) { 281 while (mCanvas->getSaveCount() > restoreCount) { 282 this->restore(); 283 } 284} 285 286int SkiaCanvas::saveLayer(float left, float top, float right, float bottom, 287 const SkPaint* paint, SkCanvas::SaveFlags flags) { 288 SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 289 int count = mCanvas->saveLayer(&bounds, paint, flags | SkCanvas::kMatrixClip_SaveFlag); 290 recordPartialSave(flags); 291 return count; 292} 293 294int SkiaCanvas::saveLayerAlpha(float left, float top, float right, float bottom, 295 int alpha, SkCanvas::SaveFlags flags) { 296 SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 297 int count = mCanvas->saveLayerAlpha(&bounds, alpha, flags | SkCanvas::kMatrixClip_SaveFlag); 298 recordPartialSave(flags); 299 return count; 300} 301 302// ---------------------------------------------------------------------------- 303// functions to emulate legacy SaveFlags (i.e. independent matrix/clip flags) 304// ---------------------------------------------------------------------------- 305 306void SkiaCanvas::recordPartialSave(SkCanvas::SaveFlags flags) { 307 // A partial save is a save operation which doesn't capture the full canvas state. 308 // (either kMatrix_SaveFlags or kClip_SaveFlag is missing). 309 310 // Mask-out non canvas state bits. 311 flags = static_cast<SkCanvas::SaveFlags>(flags & SkCanvas::kMatrixClip_SaveFlag); 312 313 if (SkCanvas::kMatrixClip_SaveFlag == flags) { 314 // not a partial save. 315 return; 316 } 317 318 if (NULL == mSaveStack.get()) { 319 mSaveStack.reset(SkNEW_ARGS(SkDeque, (sizeof(struct SaveRec), 8))); 320 } 321 322 SaveRec* rec = static_cast<SaveRec*>(mSaveStack->push_back()); 323 // Store the save counter in the SkClipStack domain. 324 // (0-based, equal to the number of save ops on the stack). 325 rec->saveCount = mCanvas->getSaveCount() - 1; 326 rec->saveFlags = flags; 327} 328 329void SkiaCanvas::saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, int frameSaveCount) { 330 SkClipStack::Iter clipIterator(*mCanvas->getClipStack(), 331 SkClipStack::Iter::kTop_IterStart); 332 while (const SkClipStack::Element* elem = clipIterator.next()) { 333 if (elem->getSaveCount() < frameSaveCount) { 334 // done with the current frame. 335 break; 336 } 337 SkASSERT(elem->getSaveCount() == frameSaveCount); 338 clips.push_back(*elem); 339 } 340} 341 342void SkiaCanvas::applyClips(const SkTArray<SkClipStack::Element>& clips) { 343 ClipCopier clipCopier(mCanvas); 344 345 // The clip stack stores clips in device space. 346 SkMatrix origMatrix = mCanvas->getTotalMatrix(); 347 mCanvas->resetMatrix(); 348 349 // We pushed the clips in reverse order. 350 for (int i = clips.count() - 1; i >= 0; --i) { 351 clips[i].replay(&clipCopier); 352 } 353 354 mCanvas->setMatrix(origMatrix); 355} 356 357// ---------------------------------------------------------------------------- 358// Canvas state operations: Matrix 359// ---------------------------------------------------------------------------- 360 361void SkiaCanvas::getMatrix(SkMatrix* outMatrix) const { 362 *outMatrix = mCanvas->getTotalMatrix(); 363} 364 365void SkiaCanvas::setMatrix(const SkMatrix& matrix) { 366 mCanvas->setMatrix(matrix); 367} 368 369void SkiaCanvas::concat(const SkMatrix& matrix) { 370 mCanvas->concat(matrix); 371} 372 373void SkiaCanvas::rotate(float degrees) { 374 mCanvas->rotate(degrees); 375} 376 377void SkiaCanvas::scale(float sx, float sy) { 378 mCanvas->scale(sx, sy); 379} 380 381void SkiaCanvas::skew(float sx, float sy) { 382 mCanvas->skew(sx, sy); 383} 384 385void SkiaCanvas::translate(float dx, float dy) { 386 mCanvas->translate(dx, dy); 387} 388 389// ---------------------------------------------------------------------------- 390// Canvas state operations: Clips 391// ---------------------------------------------------------------------------- 392 393// This function is a mirror of SkCanvas::getClipBounds except that it does 394// not outset the edge of the clip to account for anti-aliasing. There is 395// a skia bug to investigate pushing this logic into back into skia. 396// (see https://code.google.com/p/skia/issues/detail?id=1303) 397bool SkiaCanvas::getClipBounds(SkRect* outRect) const { 398 SkIRect ibounds; 399 if (!mCanvas->getClipDeviceBounds(&ibounds)) { 400 return false; 401 } 402 403 SkMatrix inverse; 404 // if we can't invert the CTM, we can't return local clip bounds 405 if (!mCanvas->getTotalMatrix().invert(&inverse)) { 406 if (outRect) { 407 outRect->setEmpty(); 408 } 409 return false; 410 } 411 412 if (NULL != outRect) { 413 SkRect r = SkRect::Make(ibounds); 414 inverse.mapRect(outRect, r); 415 } 416 return true; 417} 418 419bool SkiaCanvas::quickRejectRect(float left, float top, float right, float bottom) const { 420 SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 421 return mCanvas->quickReject(bounds); 422} 423 424bool SkiaCanvas::quickRejectPath(const SkPath& path) const { 425 return mCanvas->quickReject(path); 426} 427 428bool SkiaCanvas::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) { 429 SkRect rect = SkRect::MakeLTRB(left, top, right, bottom); 430 mCanvas->clipRect(rect, op); 431 return !mCanvas->isClipEmpty(); 432} 433 434bool SkiaCanvas::clipPath(const SkPath* path, SkRegion::Op op) { 435 mCanvas->clipPath(*path, op); 436 return !mCanvas->isClipEmpty(); 437} 438 439bool SkiaCanvas::clipRegion(const SkRegion* region, SkRegion::Op op) { 440 SkPath rgnPath; 441 if (region->getBoundaryPath(&rgnPath)) { 442 // The region is specified in device space. 443 SkMatrix savedMatrix = mCanvas->getTotalMatrix(); 444 mCanvas->resetMatrix(); 445 mCanvas->clipPath(rgnPath, op); 446 mCanvas->setMatrix(savedMatrix); 447 } else { 448 mCanvas->clipRect(SkRect::MakeEmpty(), op); 449 } 450 return !mCanvas->isClipEmpty(); 451} 452 453// ---------------------------------------------------------------------------- 454// Canvas state operations: Filters 455// ---------------------------------------------------------------------------- 456 457SkDrawFilter* SkiaCanvas::getDrawFilter() { 458 return mCanvas->getDrawFilter(); 459} 460 461void SkiaCanvas::setDrawFilter(SkDrawFilter* drawFilter) { 462 mCanvas->setDrawFilter(drawFilter); 463} 464 465// ---------------------------------------------------------------------------- 466// Canvas draw operations 467// ---------------------------------------------------------------------------- 468 469void SkiaCanvas::drawColor(int color, SkXfermode::Mode mode) { 470 mCanvas->drawColor(color, mode); 471} 472 473void SkiaCanvas::drawPaint(const SkPaint& paint) { 474 mCanvas->drawPaint(paint); 475} 476 477// ---------------------------------------------------------------------------- 478// Canvas draw operations: Geometry 479// ---------------------------------------------------------------------------- 480 481void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint, 482 SkCanvas::PointMode mode) { 483 // convert the floats into SkPoints 484 count >>= 1; // now it is the number of points 485 SkAutoSTMalloc<32, SkPoint> storage(count); 486 SkPoint* pts = storage.get(); 487 for (int i = 0; i < count; i++) { 488 pts[i].set(points[0], points[1]); 489 points += 2; 490 } 491 mCanvas->drawPoints(mode, count, pts, paint); 492} 493 494 495void SkiaCanvas::drawPoint(float x, float y, const SkPaint& paint) { 496 mCanvas->drawPoint(x, y, paint); 497} 498 499void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint) { 500 this->drawPoints(points, count, paint, SkCanvas::kPoints_PointMode); 501} 502 503void SkiaCanvas::drawLine(float startX, float startY, float stopX, float stopY, 504 const SkPaint& paint) { 505 mCanvas->drawLine(startX, startY, stopX, stopY, paint); 506} 507 508void SkiaCanvas::drawLines(const float* points, int count, const SkPaint& paint) { 509 this->drawPoints(points, count, paint, SkCanvas::kLines_PointMode); 510} 511 512void SkiaCanvas::drawRect(float left, float top, float right, float bottom, 513 const SkPaint& paint) { 514 mCanvas->drawRectCoords(left, top, right, bottom, paint); 515 516} 517 518void SkiaCanvas::drawRegion(const SkRegion& region, const SkPaint& paint) { 519 SkRegion::Iterator it(region); 520 while (!it.done()) { 521 mCanvas->drawRect(SkRect::Make(it.rect()), paint); 522 it.next(); 523 } 524} 525 526void SkiaCanvas::drawRoundRect(float left, float top, float right, float bottom, 527 float rx, float ry, const SkPaint& paint) { 528 SkRect rect = SkRect::MakeLTRB(left, top, right, bottom); 529 mCanvas->drawRoundRect(rect, rx, ry, paint); 530} 531 532void SkiaCanvas::drawCircle(float x, float y, float radius, const SkPaint& paint) { 533 mCanvas->drawCircle(x, y, radius, paint); 534} 535 536void SkiaCanvas::drawOval(float left, float top, float right, float bottom, const SkPaint& paint) { 537 SkRect oval = SkRect::MakeLTRB(left, top, right, bottom); 538 mCanvas->drawOval(oval, paint); 539} 540 541void SkiaCanvas::drawArc(float left, float top, float right, float bottom, 542 float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) { 543 SkRect arc = SkRect::MakeLTRB(left, top, right, bottom); 544 mCanvas->drawArc(arc, startAngle, sweepAngle, useCenter, paint); 545} 546 547void SkiaCanvas::drawPath(const SkPath& path, const SkPaint& paint) { 548 mCanvas->drawPath(path, paint); 549} 550 551void SkiaCanvas::drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount, 552 const float* verts, const float* texs, const int* colors, 553 const uint16_t* indices, int indexCount, const SkPaint& paint) { 554#ifndef SK_SCALAR_IS_FLOAT 555 SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid"); 556#endif 557 const int ptCount = vertexCount >> 1; 558 mCanvas->drawVertices(vertexMode, ptCount, (SkPoint*)verts, (SkPoint*)texs, 559 (SkColor*)colors, NULL, indices, indexCount, paint); 560} 561 562// ---------------------------------------------------------------------------- 563// Canvas draw operations: Bitmaps 564// ---------------------------------------------------------------------------- 565 566void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float left, float top, const SkPaint* paint) { 567 mCanvas->drawBitmap(bitmap, left, top, paint); 568} 569 570void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, const SkPaint* paint) { 571 SkAutoCanvasRestore acr(mCanvas, true); 572 mCanvas->concat(matrix); 573 mCanvas->drawBitmap(bitmap, 0, 0, paint); 574} 575 576void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop, 577 float srcRight, float srcBottom, float dstLeft, float dstTop, 578 float dstRight, float dstBottom, const SkPaint* paint) { 579 SkRect srcRect = SkRect::MakeLTRB(srcLeft, srcTop, srcRight, srcBottom); 580 SkRect dstRect = SkRect::MakeLTRB(dstLeft, dstTop, dstRight, dstBottom); 581 mCanvas->drawBitmapRectToRect(bitmap, &srcRect, dstRect, paint); 582} 583 584void SkiaCanvas::drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight, 585 const float* vertices, const int* colors, const SkPaint* paint) { 586 587 const int ptCount = (meshWidth + 1) * (meshHeight + 1); 588 const int indexCount = meshWidth * meshHeight * 6; 589 590 /* Our temp storage holds 2 or 3 arrays. 591 texture points [ptCount * sizeof(SkPoint)] 592 optionally vertex points [ptCount * sizeof(SkPoint)] if we need a 593 copy to convert from float to fixed 594 indices [ptCount * sizeof(uint16_t)] 595 */ 596 ssize_t storageSize = ptCount * sizeof(SkPoint); // texs[] 597 storageSize += indexCount * sizeof(uint16_t); // indices[] 598 599 600#ifndef SK_SCALAR_IS_FLOAT 601 SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid"); 602#endif 603 SkAutoMalloc storage(storageSize); 604 SkPoint* texs = (SkPoint*)storage.get(); 605 uint16_t* indices = (uint16_t*)(texs + ptCount); 606 607 // cons up texture coordinates and indices 608 { 609 const SkScalar w = SkIntToScalar(bitmap.width()); 610 const SkScalar h = SkIntToScalar(bitmap.height()); 611 const SkScalar dx = w / meshWidth; 612 const SkScalar dy = h / meshHeight; 613 614 SkPoint* texsPtr = texs; 615 SkScalar y = 0; 616 for (int i = 0; i <= meshHeight; i++) { 617 if (i == meshHeight) { 618 y = h; // to ensure numerically we hit h exactly 619 } 620 SkScalar x = 0; 621 for (int j = 0; j < meshWidth; j++) { 622 texsPtr->set(x, y); 623 texsPtr += 1; 624 x += dx; 625 } 626 texsPtr->set(w, y); 627 texsPtr += 1; 628 y += dy; 629 } 630 SkASSERT(texsPtr - texs == ptCount); 631 } 632 633 // cons up indices 634 { 635 uint16_t* indexPtr = indices; 636 int index = 0; 637 for (int i = 0; i < meshHeight; i++) { 638 for (int j = 0; j < meshWidth; j++) { 639 // lower-left triangle 640 *indexPtr++ = index; 641 *indexPtr++ = index + meshWidth + 1; 642 *indexPtr++ = index + meshWidth + 2; 643 // upper-right triangle 644 *indexPtr++ = index; 645 *indexPtr++ = index + meshWidth + 2; 646 *indexPtr++ = index + 1; 647 // bump to the next cell 648 index += 1; 649 } 650 // bump to the next row 651 index += 1; 652 } 653 SkASSERT(indexPtr - indices == indexCount); 654 SkASSERT((char*)indexPtr - (char*)storage.get() == storageSize); 655 } 656 657 // double-check that we have legal indices 658#ifdef SK_DEBUG 659 { 660 for (int i = 0; i < indexCount; i++) { 661 SkASSERT((unsigned)indices[i] < (unsigned)ptCount); 662 } 663 } 664#endif 665 666 // cons-up a shader for the bitmap 667 SkPaint tmpPaint; 668 if (paint) { 669 tmpPaint = *paint; 670 } 671 SkShader* shader = SkShader::CreateBitmapShader(bitmap, 672 SkShader::kClamp_TileMode, 673 SkShader::kClamp_TileMode); 674 SkSafeUnref(tmpPaint.setShader(shader)); 675 676 mCanvas->drawVertices(SkCanvas::kTriangles_VertexMode, ptCount, (SkPoint*)vertices, 677 texs, (const SkColor*)colors, NULL, indices, 678 indexCount, tmpPaint); 679} 680 681// ---------------------------------------------------------------------------- 682// Canvas draw operations: Text 683// ---------------------------------------------------------------------------- 684 685void SkiaCanvas::drawText(const uint16_t* text, const float* positions, int count, 686 const SkPaint& paint, float x, float y, 687 float boundsLeft, float boundsTop, float boundsRight, float boundsBottom, 688 float totalAdvance) { 689 // Set align to left for drawing, as we don't want individual 690 // glyphs centered or right-aligned; the offset above takes 691 // care of all alignment. 692 SkPaint paintCopy(paint); 693 paintCopy.setTextAlign(SkPaint::kLeft_Align); 694 695 SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(float)*2, SkPoint_is_no_longer_2_floats); 696 mCanvas->drawPosText(text, count << 1, reinterpret_cast<const SkPoint*>(positions), paintCopy); 697} 698 699void SkiaCanvas::drawPosText(const uint16_t* text, const float* positions, int count, int posCount, 700 const SkPaint& paint) { 701 SkPoint* posPtr = posCount > 0 ? new SkPoint[posCount] : NULL; 702 int indx; 703 for (indx = 0; indx < posCount; indx++) { 704 posPtr[indx].fX = positions[indx << 1]; 705 posPtr[indx].fY = positions[(indx << 1) + 1]; 706 } 707 708 SkPaint paintCopy(paint); 709 paintCopy.setTextEncoding(SkPaint::kUTF16_TextEncoding); 710 mCanvas->drawPosText(text, count, posPtr, paintCopy); 711 712 delete[] posPtr; 713} 714 715void SkiaCanvas::drawTextOnPath(const uint16_t* glyphs, int count, const SkPath& path, 716 float hOffset, float vOffset, const SkPaint& paint) { 717 mCanvas->drawTextOnPathHV(glyphs, count << 1, path, hOffset, vOffset, paint); 718} 719 720} // namespace android 721