SkiaCanvas.cpp revision 62feb3a0b4690144a067080ab17beae160ea6320
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 "SkiaCanvas.h" 18 19#include "CanvasProperty.h" 20#include "VectorDrawable.h" 21#include "hwui/MinikinUtils.h" 22 23#include <SkDrawable.h> 24#include <SkDevice.h> 25#include <SkDeque.h> 26#include <SkDrawFilter.h> 27#include <SkGraphics.h> 28#include <SkImage.h> 29#include <SkImagePriv.h> 30#include <SkRSXform.h> 31#include <SkShader.h> 32#include <SkTemplates.h> 33 34#include <memory> 35 36namespace android { 37 38Canvas* Canvas::create_canvas(const SkBitmap& bitmap) { 39 return new SkiaCanvas(bitmap); 40} 41 42Canvas* Canvas::create_canvas(SkCanvas* skiaCanvas) { 43 return new SkiaCanvas(skiaCanvas); 44} 45 46SkiaCanvas::SkiaCanvas(const SkBitmap& bitmap) { 47 mCanvas.reset(new SkCanvas(bitmap)); 48} 49 50void SkiaCanvas::reset(SkCanvas* skiaCanvas) { 51 mCanvas.reset(SkRef(skiaCanvas)); 52 mSaveStack.reset(nullptr); 53 mHighContrastText = false; 54} 55 56// ---------------------------------------------------------------------------- 57// Canvas state operations: Replace Bitmap 58// ---------------------------------------------------------------------------- 59 60class ClipCopier : public SkCanvas::ClipVisitor { 61public: 62 explicit ClipCopier(SkCanvas* dstCanvas) : m_dstCanvas(dstCanvas) {} 63 64 virtual void clipRect(const SkRect& rect, SkRegion::Op op, bool antialias) { 65 m_dstCanvas->clipRect(rect, op, antialias); 66 } 67 virtual void clipRRect(const SkRRect& rrect, SkRegion::Op op, bool antialias) { 68 m_dstCanvas->clipRRect(rrect, op, antialias); 69 } 70 virtual void clipPath(const SkPath& path, SkRegion::Op op, bool antialias) { 71 m_dstCanvas->clipPath(path, op, antialias); 72 } 73 74private: 75 SkCanvas* m_dstCanvas; 76}; 77 78void SkiaCanvas::setBitmap(const SkBitmap& bitmap) { 79 sk_sp<SkCanvas> newCanvas(new SkCanvas(bitmap)); 80 81 if (!bitmap.isNull()) { 82 // Copy the canvas matrix & clip state. 83 newCanvas->setMatrix(mCanvas->getTotalMatrix()); 84 85 ClipCopier copier(newCanvas.get()); 86 mCanvas->replayClips(&copier); 87 } 88 89 // unrefs the existing canvas 90 mCanvas = std::move(newCanvas); 91 92 // clean up the old save stack 93 mSaveStack.reset(NULL); 94} 95 96// ---------------------------------------------------------------------------- 97// Canvas state operations 98// ---------------------------------------------------------------------------- 99 100bool SkiaCanvas::isOpaque() { 101 return mCanvas->imageInfo().isOpaque(); 102} 103 104int SkiaCanvas::width() { 105 return mCanvas->imageInfo().width(); 106} 107 108int SkiaCanvas::height() { 109 return mCanvas->imageInfo().height(); 110} 111 112// ---------------------------------------------------------------------------- 113// Canvas state operations: Save (layer) 114// ---------------------------------------------------------------------------- 115 116int SkiaCanvas::getSaveCount() const { 117 return mCanvas->getSaveCount(); 118} 119 120int SkiaCanvas::save(SaveFlags::Flags flags) { 121 int count = mCanvas->save(); 122 recordPartialSave(flags); 123 return count; 124} 125 126// The SkiaCanvas::restore operation layers on the capability to preserve 127// either (or both) the matrix and/or clip state after a SkCanvas::restore 128// operation. It does this by explicitly saving off the clip & matrix state 129// when requested and playing it back after the SkCanvas::restore. 130void SkiaCanvas::restore() { 131 const SaveRec* rec = (NULL == mSaveStack.get()) 132 ? NULL 133 : static_cast<SaveRec*>(mSaveStack->back()); 134 int currentSaveCount = mCanvas->getSaveCount(); 135 SkASSERT(NULL == rec || currentSaveCount >= rec->saveCount); 136 137 if (NULL == rec || rec->saveCount != currentSaveCount) { 138 // Fast path - no record for this frame. 139 mCanvas->restore(); 140 return; 141 } 142 143 bool preserveMatrix = !(rec->saveFlags & SaveFlags::Matrix); 144 bool preserveClip = !(rec->saveFlags & SaveFlags::Clip); 145 146 SkMatrix savedMatrix; 147 if (preserveMatrix) { 148 savedMatrix = mCanvas->getTotalMatrix(); 149 } 150 151 SkTArray<SkClipStack::Element> savedClips; 152 int topClipStackFrame = mCanvas->getClipStack()->getSaveCount(); 153 if (preserveClip) { 154 saveClipsForFrame(savedClips, topClipStackFrame); 155 } 156 157 mCanvas->restore(); 158 159 if (preserveMatrix) { 160 mCanvas->setMatrix(savedMatrix); 161 } 162 163 if (preserveClip && !savedClips.empty() && 164 topClipStackFrame != mCanvas->getClipStack()->getSaveCount()) { 165 // Only reapply the saved clips if the top clip stack frame was actually 166 // popped by restore(). If it wasn't, it means it doesn't belong to the 167 // restored canvas frame (SkCanvas lazy save/restore kicked in). 168 applyClips(savedClips); 169 } 170 171 mSaveStack->pop_back(); 172} 173 174void SkiaCanvas::restoreToCount(int restoreCount) { 175 while (mCanvas->getSaveCount() > restoreCount) { 176 this->restore(); 177 } 178} 179 180static inline SkCanvas::SaveLayerFlags layerFlags(SaveFlags::Flags flags) { 181 SkCanvas::SaveLayerFlags layerFlags = 0; 182 183 if (!(flags & SaveFlags::HasAlphaLayer)) { 184 layerFlags |= SkCanvas::kIsOpaque_SaveLayerFlag; 185 } 186 187 if (!(flags & SaveFlags::ClipToLayer)) { 188 layerFlags |= SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag; 189 } 190 191 return layerFlags; 192} 193 194int SkiaCanvas::saveLayer(float left, float top, float right, float bottom, 195 const SkPaint* paint, SaveFlags::Flags flags) { 196 const SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 197 const SkCanvas::SaveLayerRec rec(&bounds, paint, layerFlags(flags)); 198 199 int count = mCanvas->saveLayer(rec); 200 recordPartialSave(flags); 201 return count; 202} 203 204int SkiaCanvas::saveLayerAlpha(float left, float top, float right, float bottom, 205 int alpha, SaveFlags::Flags flags) { 206 if (static_cast<unsigned>(alpha) < 0xFF) { 207 SkPaint alphaPaint; 208 alphaPaint.setAlpha(alpha); 209 return this->saveLayer(left, top, right, bottom, &alphaPaint, flags); 210 } 211 return this->saveLayer(left, top, right, bottom, nullptr, flags); 212} 213 214// ---------------------------------------------------------------------------- 215// functions to emulate legacy SaveFlags (i.e. independent matrix/clip flags) 216// ---------------------------------------------------------------------------- 217 218void SkiaCanvas::recordPartialSave(SaveFlags::Flags flags) { 219 // A partial save is a save operation which doesn't capture the full canvas state. 220 // (either SaveFlags::Matrix or SaveFlags::Clip is missing). 221 222 // Mask-out non canvas state bits. 223 flags &= SaveFlags::MatrixClip; 224 225 if (flags == SaveFlags::MatrixClip) { 226 // not a partial save. 227 return; 228 } 229 230 if (NULL == mSaveStack.get()) { 231 mSaveStack.reset(new SkDeque(sizeof(struct SaveRec), 8)); 232 } 233 234 SaveRec* rec = static_cast<SaveRec*>(mSaveStack->push_back()); 235 rec->saveCount = mCanvas->getSaveCount(); 236 rec->saveFlags = flags; 237} 238 239void SkiaCanvas::saveClipsForFrame(SkTArray<SkClipStack::Element>& clips, 240 int saveCountToBackup) { 241 // Each SkClipStack::Element stores the index of the canvas save 242 // with which it is associated. Backup only those Elements that 243 // are associated with 'saveCountToBackup' 244 SkClipStack::Iter clipIterator(*mCanvas->getClipStack(), 245 SkClipStack::Iter::kTop_IterStart); 246 while (const SkClipStack::Element* elem = clipIterator.prev()) { 247 if (elem->getSaveCount() < saveCountToBackup) { 248 // done with the target save count. 249 break; 250 } 251 SkASSERT(elem->getSaveCount() == saveCountToBackup); 252 clips.push_back(*elem); 253 } 254} 255 256void SkiaCanvas::applyClips(const SkTArray<SkClipStack::Element>& clips) { 257 ClipCopier clipCopier(mCanvas.get()); 258 259 // The clip stack stores clips in device space. 260 SkMatrix origMatrix = mCanvas->getTotalMatrix(); 261 mCanvas->resetMatrix(); 262 263 // We pushed the clips in reverse order. 264 for (int i = clips.count() - 1; i >= 0; --i) { 265 clips[i].replay(&clipCopier); 266 } 267 268 mCanvas->setMatrix(origMatrix); 269} 270 271// ---------------------------------------------------------------------------- 272// Canvas state operations: Matrix 273// ---------------------------------------------------------------------------- 274 275void SkiaCanvas::getMatrix(SkMatrix* outMatrix) const { 276 *outMatrix = mCanvas->getTotalMatrix(); 277} 278 279void SkiaCanvas::setMatrix(const SkMatrix& matrix) { 280 mCanvas->setMatrix(matrix); 281} 282 283void SkiaCanvas::concat(const SkMatrix& matrix) { 284 mCanvas->concat(matrix); 285} 286 287void SkiaCanvas::rotate(float degrees) { 288 mCanvas->rotate(degrees); 289} 290 291void SkiaCanvas::scale(float sx, float sy) { 292 mCanvas->scale(sx, sy); 293} 294 295void SkiaCanvas::skew(float sx, float sy) { 296 mCanvas->skew(sx, sy); 297} 298 299void SkiaCanvas::translate(float dx, float dy) { 300 mCanvas->translate(dx, dy); 301} 302 303// ---------------------------------------------------------------------------- 304// Canvas state operations: Clips 305// ---------------------------------------------------------------------------- 306 307// This function is a mirror of SkCanvas::getClipBounds except that it does 308// not outset the edge of the clip to account for anti-aliasing. There is 309// a skia bug to investigate pushing this logic into back into skia. 310// (see https://code.google.com/p/skia/issues/detail?id=1303) 311bool SkiaCanvas::getClipBounds(SkRect* outRect) const { 312 SkIRect ibounds; 313 if (!mCanvas->getClipDeviceBounds(&ibounds)) { 314 return false; 315 } 316 317 SkMatrix inverse; 318 // if we can't invert the CTM, we can't return local clip bounds 319 if (!mCanvas->getTotalMatrix().invert(&inverse)) { 320 if (outRect) { 321 outRect->setEmpty(); 322 } 323 return false; 324 } 325 326 if (NULL != outRect) { 327 SkRect r = SkRect::Make(ibounds); 328 inverse.mapRect(outRect, r); 329 } 330 return true; 331} 332 333bool SkiaCanvas::quickRejectRect(float left, float top, float right, float bottom) const { 334 SkRect bounds = SkRect::MakeLTRB(left, top, right, bottom); 335 return mCanvas->quickReject(bounds); 336} 337 338bool SkiaCanvas::quickRejectPath(const SkPath& path) const { 339 return mCanvas->quickReject(path); 340} 341 342bool SkiaCanvas::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) { 343 SkRect rect = SkRect::MakeLTRB(left, top, right, bottom); 344 mCanvas->clipRect(rect, op); 345 return !mCanvas->isClipEmpty(); 346} 347 348bool SkiaCanvas::clipPath(const SkPath* path, SkRegion::Op op) { 349 SkRRect roundRect; 350 if (path->isRRect(&roundRect)) { 351 mCanvas->clipRRect(roundRect, op); 352 } else { 353 mCanvas->clipPath(*path, op); 354 } 355 return !mCanvas->isClipEmpty(); 356} 357 358bool SkiaCanvas::clipRegion(const SkRegion* region, SkRegion::Op op) { 359 SkPath rgnPath; 360 if (region->getBoundaryPath(&rgnPath)) { 361 // The region is specified in device space. 362 SkMatrix savedMatrix = mCanvas->getTotalMatrix(); 363 mCanvas->resetMatrix(); 364 mCanvas->clipPath(rgnPath, op); 365 mCanvas->setMatrix(savedMatrix); 366 } else { 367 mCanvas->clipRect(SkRect::MakeEmpty(), op); 368 } 369 return !mCanvas->isClipEmpty(); 370} 371 372// ---------------------------------------------------------------------------- 373// Canvas state operations: Filters 374// ---------------------------------------------------------------------------- 375 376SkDrawFilter* SkiaCanvas::getDrawFilter() { 377 return mCanvas->getDrawFilter(); 378} 379 380void SkiaCanvas::setDrawFilter(SkDrawFilter* drawFilter) { 381 mCanvas->setDrawFilter(drawFilter); 382} 383 384// ---------------------------------------------------------------------------- 385// Canvas draw operations 386// ---------------------------------------------------------------------------- 387 388void SkiaCanvas::drawColor(int color, SkXfermode::Mode mode) { 389 mCanvas->drawColor(color, mode); 390} 391 392void SkiaCanvas::drawPaint(const SkPaint& paint) { 393 mCanvas->drawPaint(paint); 394} 395 396// ---------------------------------------------------------------------------- 397// Canvas draw operations: Geometry 398// ---------------------------------------------------------------------------- 399 400void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint, 401 SkCanvas::PointMode mode) { 402 // convert the floats into SkPoints 403 count >>= 1; // now it is the number of points 404 std::unique_ptr<SkPoint[]> pts(new SkPoint[count]); 405 for (int i = 0; i < count; i++) { 406 pts[i].set(points[0], points[1]); 407 points += 2; 408 } 409 mCanvas->drawPoints(mode, count, pts.get(), paint); 410} 411 412 413void SkiaCanvas::drawPoint(float x, float y, const SkPaint& paint) { 414 mCanvas->drawPoint(x, y, paint); 415} 416 417void SkiaCanvas::drawPoints(const float* points, int count, const SkPaint& paint) { 418 this->drawPoints(points, count, paint, SkCanvas::kPoints_PointMode); 419} 420 421void SkiaCanvas::drawLine(float startX, float startY, float stopX, float stopY, 422 const SkPaint& paint) { 423 mCanvas->drawLine(startX, startY, stopX, stopY, paint); 424} 425 426void SkiaCanvas::drawLines(const float* points, int count, const SkPaint& paint) { 427 this->drawPoints(points, count, paint, SkCanvas::kLines_PointMode); 428} 429 430void SkiaCanvas::drawRect(float left, float top, float right, float bottom, 431 const SkPaint& paint) { 432 mCanvas->drawRectCoords(left, top, right, bottom, paint); 433 434} 435 436void SkiaCanvas::drawRegion(const SkRegion& region, const SkPaint& paint) { 437 SkRegion::Iterator it(region); 438 while (!it.done()) { 439 mCanvas->drawRect(SkRect::Make(it.rect()), paint); 440 it.next(); 441 } 442} 443 444void SkiaCanvas::drawRoundRect(float left, float top, float right, float bottom, 445 float rx, float ry, const SkPaint& paint) { 446 SkRect rect = SkRect::MakeLTRB(left, top, right, bottom); 447 mCanvas->drawRoundRect(rect, rx, ry, paint); 448} 449 450void SkiaCanvas::drawCircle(float x, float y, float radius, const SkPaint& paint) { 451 mCanvas->drawCircle(x, y, radius, paint); 452} 453 454void SkiaCanvas::drawOval(float left, float top, float right, float bottom, const SkPaint& paint) { 455 SkRect oval = SkRect::MakeLTRB(left, top, right, bottom); 456 mCanvas->drawOval(oval, paint); 457} 458 459void SkiaCanvas::drawArc(float left, float top, float right, float bottom, 460 float startAngle, float sweepAngle, bool useCenter, const SkPaint& paint) { 461 SkRect arc = SkRect::MakeLTRB(left, top, right, bottom); 462 mCanvas->drawArc(arc, startAngle, sweepAngle, useCenter, paint); 463} 464 465void SkiaCanvas::drawPath(const SkPath& path, const SkPaint& paint) { 466 SkRect rect; 467 SkRRect roundRect; 468 if (path.isOval(&rect)) { 469 mCanvas->drawOval(rect, paint); 470 } else if (path.isRRect(&roundRect)) { 471 mCanvas->drawRRect(roundRect, paint); 472 } else { 473 mCanvas->drawPath(path, paint); 474 } 475} 476 477void SkiaCanvas::drawVertices(SkCanvas::VertexMode vertexMode, int vertexCount, 478 const float* verts, const float* texs, const int* colors, 479 const uint16_t* indices, int indexCount, const SkPaint& paint) { 480#ifndef SK_SCALAR_IS_FLOAT 481 SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid"); 482#endif 483 const int ptCount = vertexCount >> 1; 484 mCanvas->drawVertices(vertexMode, ptCount, (SkPoint*)verts, (SkPoint*)texs, 485 (SkColor*)colors, NULL, indices, indexCount, paint); 486} 487 488// ---------------------------------------------------------------------------- 489// Canvas draw operations: Bitmaps 490// ---------------------------------------------------------------------------- 491 492void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float left, float top, const SkPaint* paint) { 493 mCanvas->drawBitmap(bitmap, left, top, paint); 494} 495 496void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, const SkMatrix& matrix, const SkPaint* paint) { 497 SkAutoCanvasRestore acr(mCanvas.get(), true); 498 mCanvas->concat(matrix); 499 mCanvas->drawBitmap(bitmap, 0, 0, paint); 500} 501 502void SkiaCanvas::drawBitmap(const SkBitmap& bitmap, float srcLeft, float srcTop, 503 float srcRight, float srcBottom, float dstLeft, float dstTop, 504 float dstRight, float dstBottom, const SkPaint* paint) { 505 SkRect srcRect = SkRect::MakeLTRB(srcLeft, srcTop, srcRight, srcBottom); 506 SkRect dstRect = SkRect::MakeLTRB(dstLeft, dstTop, dstRight, dstBottom); 507 mCanvas->drawBitmapRect(bitmap, srcRect, dstRect, paint); 508} 509 510void SkiaCanvas::drawBitmapMesh(const SkBitmap& bitmap, int meshWidth, int meshHeight, 511 const float* vertices, const int* colors, const SkPaint* paint) { 512 513 const int ptCount = (meshWidth + 1) * (meshHeight + 1); 514 const int indexCount = meshWidth * meshHeight * 6; 515 516 /* Our temp storage holds 2 or 3 arrays. 517 texture points [ptCount * sizeof(SkPoint)] 518 optionally vertex points [ptCount * sizeof(SkPoint)] if we need a 519 copy to convert from float to fixed 520 indices [ptCount * sizeof(uint16_t)] 521 */ 522 ssize_t storageSize = ptCount * sizeof(SkPoint); // texs[] 523 storageSize += indexCount * sizeof(uint16_t); // indices[] 524 525 526#ifndef SK_SCALAR_IS_FLOAT 527 SkDEBUGFAIL("SkScalar must be a float for these conversions to be valid"); 528#endif 529 std::unique_ptr<char[]> storage(new char[storageSize]); 530 SkPoint* texs = (SkPoint*)storage.get(); 531 uint16_t* indices = (uint16_t*)(texs + ptCount); 532 533 // cons up texture coordinates and indices 534 { 535 const SkScalar w = SkIntToScalar(bitmap.width()); 536 const SkScalar h = SkIntToScalar(bitmap.height()); 537 const SkScalar dx = w / meshWidth; 538 const SkScalar dy = h / meshHeight; 539 540 SkPoint* texsPtr = texs; 541 SkScalar y = 0; 542 for (int i = 0; i <= meshHeight; i++) { 543 if (i == meshHeight) { 544 y = h; // to ensure numerically we hit h exactly 545 } 546 SkScalar x = 0; 547 for (int j = 0; j < meshWidth; j++) { 548 texsPtr->set(x, y); 549 texsPtr += 1; 550 x += dx; 551 } 552 texsPtr->set(w, y); 553 texsPtr += 1; 554 y += dy; 555 } 556 SkASSERT(texsPtr - texs == ptCount); 557 } 558 559 // cons up indices 560 { 561 uint16_t* indexPtr = indices; 562 int index = 0; 563 for (int i = 0; i < meshHeight; i++) { 564 for (int j = 0; j < meshWidth; j++) { 565 // lower-left triangle 566 *indexPtr++ = index; 567 *indexPtr++ = index + meshWidth + 1; 568 *indexPtr++ = index + meshWidth + 2; 569 // upper-right triangle 570 *indexPtr++ = index; 571 *indexPtr++ = index + meshWidth + 2; 572 *indexPtr++ = index + 1; 573 // bump to the next cell 574 index += 1; 575 } 576 // bump to the next row 577 index += 1; 578 } 579 SkASSERT(indexPtr - indices == indexCount); 580 SkASSERT((char*)indexPtr - (char*)storage.get() == storageSize); 581 } 582 583 // double-check that we have legal indices 584#ifdef SK_DEBUG 585 { 586 for (int i = 0; i < indexCount; i++) { 587 SkASSERT((unsigned)indices[i] < (unsigned)ptCount); 588 } 589 } 590#endif 591 592 // cons-up a shader for the bitmap 593 SkPaint tmpPaint; 594 if (paint) { 595 tmpPaint = *paint; 596 } 597 sk_sp<SkShader> shader = SkMakeBitmapShader(bitmap, 598 SkShader::kClamp_TileMode, 599 SkShader::kClamp_TileMode, 600 nullptr, 601 kNever_SkCopyPixelsMode, 602 nullptr); 603 tmpPaint.setShader(std::move(shader)); 604 605 mCanvas->drawVertices(SkCanvas::kTriangles_VertexMode, ptCount, (SkPoint*)vertices, 606 texs, (const SkColor*)colors, NULL, indices, 607 indexCount, tmpPaint); 608} 609 610void SkiaCanvas::drawNinePatch(const SkBitmap& bitmap, const Res_png_9patch& chunk, 611 float dstLeft, float dstTop, float dstRight, float dstBottom, const SkPaint* paint) { 612 SkRect bounds = SkRect::MakeLTRB(dstLeft, dstTop, dstRight, dstBottom); 613 NinePatch::Draw(mCanvas.get(), bounds, bitmap, chunk, paint, nullptr); 614} 615 616void SkiaCanvas::drawVectorDrawable(VectorDrawableRoot* vectorDrawable) { 617 vectorDrawable->drawStaging(this); 618} 619 620// ---------------------------------------------------------------------------- 621// Canvas draw operations: Text 622// ---------------------------------------------------------------------------- 623 624void SkiaCanvas::drawGlyphs(const uint16_t* text, const float* positions, int count, 625 const SkPaint& paint, float x, float y, 626 float boundsLeft, float boundsTop, float boundsRight, float boundsBottom, 627 float totalAdvance) { 628 static_assert(sizeof(SkPoint) == sizeof(float)*2, "SkPoint is no longer two floats"); 629 mCanvas->drawPosText(text, count << 1, reinterpret_cast<const SkPoint*>(positions), paint); 630 drawTextDecorations(x, y, totalAdvance, paint); 631} 632 633void SkiaCanvas::drawLayoutOnPath(const minikin::Layout& layout, float hOffset, float vOffset, 634 const SkPaint& paint, const SkPath& path, size_t start, size_t end) { 635 const int N = end - start; 636 SkAutoSMalloc<1024> storage(N * (sizeof(uint16_t) + sizeof(SkRSXform))); 637 SkRSXform* xform = (SkRSXform*)storage.get(); 638 uint16_t* glyphs = (uint16_t*)(xform + N); 639 SkPathMeasure meas(path, false); 640 641 for (size_t i = start; i < end; i++) { 642 glyphs[i - start] = layout.getGlyphId(i); 643 float x = hOffset + layout.getX(i); 644 float y = vOffset + layout.getY(i); 645 646 SkPoint pos; 647 SkVector tan; 648 if (!meas.getPosTan(x, &pos, &tan)) { 649 pos.set(x, y); 650 tan.set(1, 0); 651 } 652 xform[i - start].fSCos = tan.x(); 653 xform[i - start].fSSin = tan.y(); 654 xform[i - start].fTx = pos.x() - tan.y() * y; 655 xform[i - start].fTy = pos.y() + tan.x() * y; 656 } 657 658 this->asSkCanvas()->drawTextRSXform(glyphs, sizeof(uint16_t) * N, xform, nullptr, paint); 659} 660 661// ---------------------------------------------------------------------------- 662// Canvas draw operations: Animations 663// ---------------------------------------------------------------------------- 664 665class AnimatedRoundRect : public SkDrawable { 666 public: 667 AnimatedRoundRect(uirenderer::CanvasPropertyPrimitive* left, 668 uirenderer::CanvasPropertyPrimitive* top, uirenderer::CanvasPropertyPrimitive* right, 669 uirenderer::CanvasPropertyPrimitive* bottom, uirenderer::CanvasPropertyPrimitive* rx, 670 uirenderer::CanvasPropertyPrimitive* ry, uirenderer::CanvasPropertyPaint* p) : 671 mLeft(left), mTop(top), mRight(right), mBottom(bottom), mRx(rx), mRy(ry), mPaint(p) {} 672 673 protected: 674 virtual SkRect onGetBounds() override { 675 return SkRect::MakeLTRB(mLeft->value, mTop->value, mRight->value, mBottom->value); 676 } 677 virtual void onDraw(SkCanvas* canvas) override { 678 SkRect rect = SkRect::MakeLTRB(mLeft->value, mTop->value, mRight->value, mBottom->value); 679 canvas->drawRoundRect(rect, mRx->value, mRy->value, mPaint->value); 680 } 681 682 private: 683 sp<uirenderer::CanvasPropertyPrimitive> mLeft; 684 sp<uirenderer::CanvasPropertyPrimitive> mTop; 685 sp<uirenderer::CanvasPropertyPrimitive> mRight; 686 sp<uirenderer::CanvasPropertyPrimitive> mBottom; 687 sp<uirenderer::CanvasPropertyPrimitive> mRx; 688 sp<uirenderer::CanvasPropertyPrimitive> mRy; 689 sp<uirenderer::CanvasPropertyPaint> mPaint; 690}; 691 692class AnimatedCircle : public SkDrawable { 693 public: 694 AnimatedCircle(uirenderer::CanvasPropertyPrimitive* x, uirenderer::CanvasPropertyPrimitive* y, 695 uirenderer::CanvasPropertyPrimitive* radius, uirenderer::CanvasPropertyPaint* paint) : 696 mX(x), mY(y), mRadius(radius), mPaint(paint) {} 697 698 protected: 699 virtual SkRect onGetBounds() override { 700 const float x = mX->value; 701 const float y = mY->value; 702 const float radius = mRadius->value; 703 return SkRect::MakeLTRB(x - radius, y - radius, x + radius, y + radius); 704 } 705 virtual void onDraw(SkCanvas* canvas) override { 706 canvas->drawCircle(mX->value, mY->value, mRadius->value, mPaint->value); 707 } 708 709 private: 710 sp<uirenderer::CanvasPropertyPrimitive> mX; 711 sp<uirenderer::CanvasPropertyPrimitive> mY; 712 sp<uirenderer::CanvasPropertyPrimitive> mRadius; 713 sp<uirenderer::CanvasPropertyPaint> mPaint; 714}; 715 716void SkiaCanvas::drawRoundRect(uirenderer::CanvasPropertyPrimitive* left, 717 uirenderer::CanvasPropertyPrimitive* top, uirenderer::CanvasPropertyPrimitive* right, 718 uirenderer::CanvasPropertyPrimitive* bottom, uirenderer::CanvasPropertyPrimitive* rx, 719 uirenderer::CanvasPropertyPrimitive* ry, uirenderer::CanvasPropertyPaint* paint) { 720 sk_sp<AnimatedRoundRect> drawable( 721 new AnimatedRoundRect(left, top, right, bottom, rx, ry, paint)); 722 mCanvas->drawDrawable(drawable.get()); 723} 724 725void SkiaCanvas::drawCircle(uirenderer::CanvasPropertyPrimitive* x, uirenderer::CanvasPropertyPrimitive* y, 726 uirenderer::CanvasPropertyPrimitive* radius, uirenderer::CanvasPropertyPaint* paint) { 727 sk_sp<AnimatedCircle> drawable(new AnimatedCircle(x, y, radius, paint)); 728 mCanvas->drawDrawable(drawable.get()); 729} 730 731// ---------------------------------------------------------------------------- 732// Canvas draw operations: View System 733// ---------------------------------------------------------------------------- 734 735void SkiaCanvas::drawLayer(uirenderer::DeferredLayerUpdater* layer) { 736 LOG_ALWAYS_FATAL("SkiaCanvas can't directly draw Layers"); 737} 738 739void SkiaCanvas::drawRenderNode(uirenderer::RenderNode* renderNode) { 740 LOG_ALWAYS_FATAL("SkiaCanvas can't directly draw RenderNodes"); 741} 742 743void SkiaCanvas::callDrawGLFunction(Functor* functor, 744 uirenderer::GlFunctorLifecycleListener* listener) { 745 LOG_ALWAYS_FATAL("SkiaCanvas can't directly draw GL Content"); 746} 747 748} // namespace android 749