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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "modules/canvas2d/BaseRenderingContext2D.h" | |
6 | |
7 #include "bindings/core/v8/ExceptionMessages.h" | |
8 #include "bindings/core/v8/ExceptionState.h" | |
9 #include "bindings/core/v8/ExceptionStatePlaceholder.h" | |
10 #include "core/css/parser/CSSParser.h" | |
11 #include "core/frame/ImageBitmap.h" | |
12 #include "core/html/HTMLCanvasElement.h" | |
13 #include "core/html/HTMLImageElement.h" | |
14 #include "core/html/HTMLVideoElement.h" | |
15 #include "core/html/ImageData.h" | |
16 #include "modules/canvas2d/CanvasGradient.h" | |
17 #include "modules/canvas2d/CanvasPattern.h" | |
18 #include "modules/canvas2d/CanvasStyle.h" | |
19 #include "modules/canvas2d/Path2D.h" | |
20 #include "platform/geometry/FloatQuad.h" | |
21 #include "platform/graphics/Color.h" | |
22 #include "platform/graphics/ExpensiveCanvasHeuristicParameters.h" | |
23 #include "platform/graphics/Image.h" | |
24 #include "platform/graphics/ImageBuffer.h" | |
25 #include "platform/graphics/StrokeData.h" | |
26 #include "platform/graphics/skia/SkiaUtils.h" | |
27 #include "third_party/skia/include/core/SkImageFilter.h" | |
28 | |
29 namespace blink { | |
30 | |
31 BaseRenderingContext2D::BaseRenderingContext2D() | |
32 : m_clipAntialiasing(NotAntiAliased) | |
33 { | |
34 m_stateStack.append(CanvasRenderingContext2DState::create()); | |
35 } | |
36 | |
37 BaseRenderingContext2D::~BaseRenderingContext2D() | |
38 { | |
39 } | |
40 | |
41 CanvasRenderingContext2DState& BaseRenderingContext2D::modifiableState() | |
42 { | |
43 realizeSaves(); | |
44 return *m_stateStack.last(); | |
45 } | |
46 | |
47 void BaseRenderingContext2D::realizeSaves() | |
48 { | |
49 validateStateStack(); | |
50 if (state().hasUnrealizedSaves()) { | |
51 ASSERT(m_stateStack.size() >= 1); | |
52 // Reduce the current state's unrealized count by one now, | |
53 // to reflect the fact we are saving one state. | |
54 m_stateStack.last()->restore(); | |
55 m_stateStack.append(CanvasRenderingContext2DState::create(state(), Canva
sRenderingContext2DState::DontCopyClipList)); | |
56 // Set the new state's unrealized count to 0, because it has no outstand
ing saves. | |
57 // We need to do this explicitly because the copy constructor and operat
or= used | |
58 // by the Vector operations copy the unrealized count from the previous
state (in | |
59 // turn necessary to support correct resizing and unwinding of the stack
). | |
60 m_stateStack.last()->resetUnrealizedSaveCount(); | |
61 SkCanvas* canvas = drawingCanvas(); | |
62 if (canvas) | |
63 canvas->save(); | |
64 validateStateStack(); | |
65 } | |
66 } | |
67 | |
68 void BaseRenderingContext2D::save() | |
69 { | |
70 m_stateStack.last()->save(); | |
71 } | |
72 | |
73 void BaseRenderingContext2D::restore() | |
74 { | |
75 validateStateStack(); | |
76 if (state().hasUnrealizedSaves()) { | |
77 // We never realized the save, so just record that it was unnecessary. | |
78 m_stateStack.last()->restore(); | |
79 return; | |
80 } | |
81 ASSERT(m_stateStack.size() >= 1); | |
82 if (m_stateStack.size() <= 1) | |
83 return; | |
84 m_path.transform(state().transform()); | |
85 m_stateStack.removeLast(); | |
86 m_stateStack.last()->clearResolvedFilter(); | |
87 m_path.transform(state().transform().inverse()); | |
88 SkCanvas* c = drawingCanvas(); | |
89 if (c) | |
90 c->restore(); | |
91 | |
92 validateStateStack(); | |
93 } | |
94 | |
95 static inline void convertCanvasStyleToUnionType(CanvasStyle* style, StringOrCan
vasGradientOrCanvasPattern& returnValue) | |
96 { | |
97 if (CanvasGradient* gradient = style->canvasGradient()) { | |
98 returnValue.setCanvasGradient(gradient); | |
99 return; | |
100 } | |
101 if (CanvasPattern* pattern = style->canvasPattern()) { | |
102 returnValue.setCanvasPattern(pattern); | |
103 return; | |
104 } | |
105 returnValue.setString(style->color()); | |
106 } | |
107 | |
108 void BaseRenderingContext2D::strokeStyle(StringOrCanvasGradientOrCanvasPattern&
returnValue) const | |
109 { | |
110 convertCanvasStyleToUnionType(state().strokeStyle(), returnValue); | |
111 } | |
112 | |
113 void BaseRenderingContext2D::setStrokeStyle(const StringOrCanvasGradientOrCanvas
Pattern& style) | |
114 { | |
115 ASSERT(!style.isNull()); | |
116 | |
117 String colorString; | |
118 CanvasStyle* canvasStyle = nullptr; | |
119 if (style.isString()) { | |
120 colorString = style.getAsString(); | |
121 if (colorString == state().unparsedStrokeColor()) | |
122 return; | |
123 Color parsedColor = 0; | |
124 if (!parseColorOrCurrentColor(parsedColor, colorString)) | |
125 return; | |
126 if (state().strokeStyle()->isEquivalentRGBA(parsedColor.rgb())) { | |
127 modifiableState().setUnparsedStrokeColor(colorString); | |
128 return; | |
129 } | |
130 canvasStyle = CanvasStyle::createFromRGBA(parsedColor.rgb()); | |
131 } else if (style.isCanvasGradient()) { | |
132 canvasStyle = CanvasStyle::createFromGradient(style.getAsCanvasGradient(
)); | |
133 } else if (style.isCanvasPattern()) { | |
134 CanvasPattern* canvasPattern = style.getAsCanvasPattern(); | |
135 | |
136 if (originClean() && !canvasPattern->originClean()) | |
137 setOriginTainted(); | |
138 | |
139 canvasStyle = CanvasStyle::createFromPattern(canvasPattern); | |
140 } | |
141 | |
142 ASSERT(canvasStyle); | |
143 | |
144 modifiableState().setStrokeStyle(canvasStyle); | |
145 modifiableState().setUnparsedStrokeColor(colorString); | |
146 modifiableState().clearResolvedFilter(); | |
147 } | |
148 | |
149 void BaseRenderingContext2D::fillStyle(StringOrCanvasGradientOrCanvasPattern& re
turnValue) const | |
150 { | |
151 convertCanvasStyleToUnionType(state().fillStyle(), returnValue); | |
152 } | |
153 | |
154 void BaseRenderingContext2D::setFillStyle(const StringOrCanvasGradientOrCanvasPa
ttern& style) | |
155 { | |
156 ASSERT(!style.isNull()); | |
157 validateStateStack(); | |
158 String colorString; | |
159 CanvasStyle* canvasStyle = nullptr; | |
160 if (style.isString()) { | |
161 colorString = style.getAsString(); | |
162 if (colorString == state().unparsedFillColor()) | |
163 return; | |
164 Color parsedColor = 0; | |
165 if (!parseColorOrCurrentColor(parsedColor, colorString)) | |
166 return; | |
167 if (state().fillStyle()->isEquivalentRGBA(parsedColor.rgb())) { | |
168 modifiableState().setUnparsedFillColor(colorString); | |
169 return; | |
170 } | |
171 canvasStyle = CanvasStyle::createFromRGBA(parsedColor.rgb()); | |
172 } else if (style.isCanvasGradient()) { | |
173 canvasStyle = CanvasStyle::createFromGradient(style.getAsCanvasGradient(
)); | |
174 } else if (style.isCanvasPattern()) { | |
175 CanvasPattern* canvasPattern = style.getAsCanvasPattern(); | |
176 | |
177 if (originClean() && !canvasPattern->originClean()) | |
178 setOriginTainted(); | |
179 if (canvasPattern->pattern()->isTextureBacked()) | |
180 disableDeferral(DisableDeferralReasonUsingTextureBackedPattern); | |
181 canvasStyle = CanvasStyle::createFromPattern(canvasPattern); | |
182 } | |
183 | |
184 ASSERT(canvasStyle); | |
185 modifiableState().setFillStyle(canvasStyle); | |
186 modifiableState().setUnparsedFillColor(colorString); | |
187 modifiableState().clearResolvedFilter(); | |
188 } | |
189 | |
190 double BaseRenderingContext2D::lineWidth() const | |
191 { | |
192 return state().lineWidth(); | |
193 } | |
194 | |
195 void BaseRenderingContext2D::setLineWidth(double width) | |
196 { | |
197 if (!std::isfinite(width) || width <= 0) | |
198 return; | |
199 if (state().lineWidth() == width) | |
200 return; | |
201 modifiableState().setLineWidth(width); | |
202 } | |
203 | |
204 String BaseRenderingContext2D::lineCap() const | |
205 { | |
206 return lineCapName(state().lineCap()); | |
207 } | |
208 | |
209 void BaseRenderingContext2D::setLineCap(const String& s) | |
210 { | |
211 LineCap cap; | |
212 if (!parseLineCap(s, cap)) | |
213 return; | |
214 if (state().lineCap() == cap) | |
215 return; | |
216 modifiableState().setLineCap(cap); | |
217 } | |
218 | |
219 String BaseRenderingContext2D::lineJoin() const | |
220 { | |
221 return lineJoinName(state().lineJoin()); | |
222 } | |
223 | |
224 void BaseRenderingContext2D::setLineJoin(const String& s) | |
225 { | |
226 LineJoin join; | |
227 if (!parseLineJoin(s, join)) | |
228 return; | |
229 if (state().lineJoin() == join) | |
230 return; | |
231 modifiableState().setLineJoin(join); | |
232 } | |
233 | |
234 double BaseRenderingContext2D::miterLimit() const | |
235 { | |
236 return state().miterLimit(); | |
237 } | |
238 | |
239 void BaseRenderingContext2D::setMiterLimit(double limit) | |
240 { | |
241 if (!std::isfinite(limit) || limit <= 0) | |
242 return; | |
243 if (state().miterLimit() == limit) | |
244 return; | |
245 modifiableState().setMiterLimit(limit); | |
246 } | |
247 | |
248 double BaseRenderingContext2D::shadowOffsetX() const | |
249 { | |
250 return state().shadowOffset().width(); | |
251 } | |
252 | |
253 void BaseRenderingContext2D::setShadowOffsetX(double x) | |
254 { | |
255 if (!std::isfinite(x)) | |
256 return; | |
257 if (state().shadowOffset().width() == x) | |
258 return; | |
259 modifiableState().setShadowOffsetX(x); | |
260 } | |
261 | |
262 double BaseRenderingContext2D::shadowOffsetY() const | |
263 { | |
264 return state().shadowOffset().height(); | |
265 } | |
266 | |
267 void BaseRenderingContext2D::setShadowOffsetY(double y) | |
268 { | |
269 if (!std::isfinite(y)) | |
270 return; | |
271 if (state().shadowOffset().height() == y) | |
272 return; | |
273 modifiableState().setShadowOffsetY(y); | |
274 } | |
275 | |
276 double BaseRenderingContext2D::shadowBlur() const | |
277 { | |
278 return state().shadowBlur(); | |
279 } | |
280 | |
281 void BaseRenderingContext2D::setShadowBlur(double blur) | |
282 { | |
283 if (!std::isfinite(blur) || blur < 0) | |
284 return; | |
285 if (state().shadowBlur() == blur) | |
286 return; | |
287 modifiableState().setShadowBlur(blur); | |
288 } | |
289 | |
290 String BaseRenderingContext2D::shadowColor() const | |
291 { | |
292 return Color(state().shadowColor()).serialized(); | |
293 } | |
294 | |
295 void BaseRenderingContext2D::setShadowColor(const String& colorString) | |
296 { | |
297 Color color; | |
298 if (!parseColorOrCurrentColor(color, colorString)) | |
299 return; | |
300 if (state().shadowColor() == color) | |
301 return; | |
302 modifiableState().setShadowColor(color.rgb()); | |
303 } | |
304 | |
305 const Vector<double>& BaseRenderingContext2D::getLineDash() const | |
306 { | |
307 return state().lineDash(); | |
308 } | |
309 | |
310 static bool lineDashSequenceIsValid(const Vector<double>& dash) | |
311 { | |
312 for (size_t i = 0; i < dash.size(); i++) { | |
313 if (!std::isfinite(dash[i]) || dash[i] < 0) | |
314 return false; | |
315 } | |
316 return true; | |
317 } | |
318 | |
319 void BaseRenderingContext2D::setLineDash(const Vector<double>& dash) | |
320 { | |
321 if (!lineDashSequenceIsValid(dash)) | |
322 return; | |
323 modifiableState().setLineDash(dash); | |
324 } | |
325 | |
326 double BaseRenderingContext2D::lineDashOffset() const | |
327 { | |
328 return state().lineDashOffset(); | |
329 } | |
330 | |
331 void BaseRenderingContext2D::setLineDashOffset(double offset) | |
332 { | |
333 if (!std::isfinite(offset) || state().lineDashOffset() == offset) | |
334 return; | |
335 modifiableState().setLineDashOffset(offset); | |
336 } | |
337 | |
338 double BaseRenderingContext2D::globalAlpha() const | |
339 { | |
340 return state().globalAlpha(); | |
341 } | |
342 | |
343 void BaseRenderingContext2D::setGlobalAlpha(double alpha) | |
344 { | |
345 if (!(alpha >= 0 && alpha <= 1)) | |
346 return; | |
347 if (state().globalAlpha() == alpha) | |
348 return; | |
349 modifiableState().setGlobalAlpha(alpha); | |
350 } | |
351 | |
352 String BaseRenderingContext2D::globalCompositeOperation() const | |
353 { | |
354 return compositeOperatorName(compositeOperatorFromSkia(state().globalComposi
te()), blendModeFromSkia(state().globalComposite())); | |
355 } | |
356 | |
357 void BaseRenderingContext2D::setGlobalCompositeOperation(const String& operation
) | |
358 { | |
359 CompositeOperator op = CompositeSourceOver; | |
360 WebBlendMode blendMode = WebBlendModeNormal; | |
361 if (!parseCompositeAndBlendOperator(operation, op, blendMode)) | |
362 return; | |
363 SkXfermode::Mode xfermode = WebCoreCompositeToSkiaComposite(op, blendMode); | |
364 if (state().globalComposite() == xfermode) | |
365 return; | |
366 modifiableState().setGlobalComposite(xfermode); | |
367 } | |
368 | |
369 String BaseRenderingContext2D::filter() const | |
370 { | |
371 return state().unparsedFilter(); | |
372 } | |
373 | |
374 void BaseRenderingContext2D::setFilter(const String& filterString) | |
375 { | |
376 if (filterString == state().unparsedFilter()) | |
377 return; | |
378 | |
379 RefPtrWillBeRawPtr<CSSValue> filterValue = CSSParser::parseSingleValue(CSSPr
opertyWebkitFilter, filterString, CSSParserContext(HTMLStandardMode, 0)); | |
380 | |
381 if (!filterValue || filterValue->isInitialValue() || filterValue->isInherite
dValue()) | |
382 return; | |
383 | |
384 modifiableState().setUnparsedFilter(filterString); | |
385 modifiableState().setFilter(filterValue.release()); | |
386 } | |
387 | |
388 PassRefPtrWillBeRawPtr<SVGMatrixTearOff> BaseRenderingContext2D::currentTransfor
m() const | |
389 { | |
390 return SVGMatrixTearOff::create(state().transform()); | |
391 } | |
392 | |
393 void BaseRenderingContext2D::setCurrentTransform(PassRefPtrWillBeRawPtr<SVGMatri
xTearOff> passMatrixTearOff) | |
394 { | |
395 RefPtrWillBeRawPtr<SVGMatrixTearOff> matrixTearOff = passMatrixTearOff; | |
396 const AffineTransform& transform = matrixTearOff->value(); | |
397 setTransform(transform.a(), transform.b(), transform.c(), transform.d(), tra
nsform.e(), transform.f()); | |
398 } | |
399 | |
400 void BaseRenderingContext2D::scale(double sx, double sy) | |
401 { | |
402 SkCanvas* c = drawingCanvas(); | |
403 if (!c) | |
404 return; | |
405 | |
406 if (!std::isfinite(sx) || !std::isfinite(sy)) | |
407 return; | |
408 | |
409 AffineTransform newTransform = state().transform(); | |
410 newTransform.scaleNonUniform(sx, sy); | |
411 if (state().transform() == newTransform) | |
412 return; | |
413 | |
414 modifiableState().setTransform(newTransform); | |
415 if (!state().isTransformInvertible()) | |
416 return; | |
417 | |
418 c->scale(sx, sy); | |
419 m_path.transform(AffineTransform().scaleNonUniform(1.0 / sx, 1.0 / sy)); | |
420 } | |
421 | |
422 void BaseRenderingContext2D::rotate(double angleInRadians) | |
423 { | |
424 SkCanvas* c = drawingCanvas(); | |
425 if (!c) | |
426 return; | |
427 | |
428 if (!std::isfinite(angleInRadians)) | |
429 return; | |
430 | |
431 AffineTransform newTransform = state().transform(); | |
432 newTransform.rotateRadians(angleInRadians); | |
433 if (state().transform() == newTransform) | |
434 return; | |
435 | |
436 modifiableState().setTransform(newTransform); | |
437 if (!state().isTransformInvertible()) | |
438 return; | |
439 c->rotate(angleInRadians * (180.0 / piFloat)); | |
440 m_path.transform(AffineTransform().rotateRadians(-angleInRadians)); | |
441 } | |
442 | |
443 void BaseRenderingContext2D::translate(double tx, double ty) | |
444 { | |
445 SkCanvas* c = drawingCanvas(); | |
446 if (!c) | |
447 return; | |
448 if (!state().isTransformInvertible()) | |
449 return; | |
450 | |
451 if (!std::isfinite(tx) || !std::isfinite(ty)) | |
452 return; | |
453 | |
454 AffineTransform newTransform = state().transform(); | |
455 newTransform.translate(tx, ty); | |
456 if (state().transform() == newTransform) | |
457 return; | |
458 | |
459 modifiableState().setTransform(newTransform); | |
460 if (!state().isTransformInvertible()) | |
461 return; | |
462 c->translate(tx, ty); | |
463 m_path.transform(AffineTransform().translate(-tx, -ty)); | |
464 } | |
465 | |
466 void BaseRenderingContext2D::transform(double m11, double m12, double m21, doubl
e m22, double dx, double dy) | |
467 { | |
468 SkCanvas* c = drawingCanvas(); | |
469 if (!c) | |
470 return; | |
471 | |
472 if (!std::isfinite(m11) || !std::isfinite(m21) || !std::isfinite(dx) || !std
::isfinite(m12) || !std::isfinite(m22) || !std::isfinite(dy)) | |
473 return; | |
474 | |
475 AffineTransform transform(m11, m12, m21, m22, dx, dy); | |
476 AffineTransform newTransform = state().transform() * transform; | |
477 if (state().transform() == newTransform) | |
478 return; | |
479 | |
480 modifiableState().setTransform(newTransform); | |
481 if (!state().isTransformInvertible()) | |
482 return; | |
483 | |
484 c->concat(affineTransformToSkMatrix(transform)); | |
485 m_path.transform(transform.inverse()); | |
486 } | |
487 | |
488 void BaseRenderingContext2D::resetTransform() | |
489 { | |
490 SkCanvas* c = drawingCanvas(); | |
491 if (!c) | |
492 return; | |
493 | |
494 AffineTransform ctm = state().transform(); | |
495 bool invertibleCTM = state().isTransformInvertible(); | |
496 // It is possible that CTM is identity while CTM is not invertible. | |
497 // When CTM becomes non-invertible, realizeSaves() can make CTM identity. | |
498 if (ctm.isIdentity() && invertibleCTM) | |
499 return; | |
500 | |
501 // resetTransform() resolves the non-invertible CTM state. | |
502 modifiableState().resetTransform(); | |
503 c->setMatrix(affineTransformToSkMatrix(baseTransform())); | |
504 | |
505 if (invertibleCTM) | |
506 m_path.transform(ctm); | |
507 // When else, do nothing because all transform methods didn't update m_path
when CTM became non-invertible. | |
508 // It means that resetTransform() restores m_path just before CTM became non
-invertible. | |
509 } | |
510 | |
511 void BaseRenderingContext2D::setTransform(double m11, double m12, double m21, do
uble m22, double dx, double dy) | |
512 { | |
513 SkCanvas* c = drawingCanvas(); | |
514 if (!c) | |
515 return; | |
516 | |
517 if (!std::isfinite(m11) || !std::isfinite(m21) || !std::isfinite(dx) || !std
::isfinite(m12) || !std::isfinite(m22) || !std::isfinite(dy)) | |
518 return; | |
519 | |
520 resetTransform(); | |
521 transform(m11, m12, m21, m22, dx, dy); | |
522 } | |
523 | |
524 void BaseRenderingContext2D::beginPath() | |
525 { | |
526 m_path.clear(); | |
527 } | |
528 | |
529 static bool validateRectForCanvas(double& x, double& y, double& width, double& h
eight) | |
530 { | |
531 if (!std::isfinite(x) || !std::isfinite(y) || !std::isfinite(width) || !std:
:isfinite(height)) | |
532 return false; | |
533 | |
534 if (!width && !height) | |
535 return false; | |
536 | |
537 if (width < 0) { | |
538 width = -width; | |
539 x -= width; | |
540 } | |
541 | |
542 if (height < 0) { | |
543 height = -height; | |
544 y -= height; | |
545 } | |
546 | |
547 return true; | |
548 } | |
549 | |
550 bool BaseRenderingContext2D::isFullCanvasCompositeMode(SkXfermode::Mode op) | |
551 { | |
552 // See 4.8.11.1.3 Compositing | |
553 // CompositeSourceAtop and CompositeDestinationOut are not listed here as th
e platforms already | |
554 // implement the specification's behavior. | |
555 return op == SkXfermode::kSrcIn_Mode || op == SkXfermode::kSrcOut_Mode || op
== SkXfermode::kDstIn_Mode || op == SkXfermode::kDstATop_Mode; | |
556 } | |
557 | |
558 static bool isPathExpensive(const Path& path) | |
559 { | |
560 const SkPath& skPath = path.skPath(); | |
561 if (ExpensiveCanvasHeuristicParameters::ConcavePathsAreExpensive && !skPath.
isConvex()) | |
562 return true; | |
563 | |
564 if (skPath.countPoints() > ExpensiveCanvasHeuristicParameters::ExpensivePath
PointCount) | |
565 return true; | |
566 | |
567 return false; | |
568 } | |
569 | |
570 void BaseRenderingContext2D::drawPathInternal(const Path& path, CanvasRenderingC
ontext2DState::PaintType paintType, SkPath::FillType fillType) | |
571 { | |
572 if (path.isEmpty()) | |
573 return; | |
574 | |
575 SkPath skPath = path.skPath(); | |
576 FloatRect bounds = path.boundingRect(); | |
577 skPath.setFillType(fillType); | |
578 | |
579 if (paintType == CanvasRenderingContext2DState::StrokePaintType) | |
580 inflateStrokeRect(bounds); | |
581 | |
582 if (!drawingCanvas()) | |
583 return; | |
584 | |
585 if (draw( | |
586 [&skPath, this](SkCanvas* c, const SkPaint* paint) // draw lambda | |
587 { | |
588 c->drawPath(skPath, *paint); | |
589 }, | |
590 [](const SkIRect& rect) // overdraw test lambda | |
591 { | |
592 return false; | |
593 }, bounds, paintType)) { | |
594 if (isPathExpensive(path)) { | |
595 ImageBuffer* buffer = imageBuffer(); | |
596 if (buffer) | |
597 buffer->setHasExpensiveOp(); | |
598 } | |
599 } | |
600 } | |
601 | |
602 static SkPath::FillType parseWinding(const String& windingRuleString) | |
603 { | |
604 if (windingRuleString == "nonzero") | |
605 return SkPath::kWinding_FillType; | |
606 if (windingRuleString == "evenodd") | |
607 return SkPath::kEvenOdd_FillType; | |
608 | |
609 ASSERT_NOT_REACHED(); | |
610 return SkPath::kEvenOdd_FillType; | |
611 } | |
612 | |
613 void BaseRenderingContext2D::fill(const String& windingRuleString) | |
614 { | |
615 drawPathInternal(m_path, CanvasRenderingContext2DState::FillPaintType, parse
Winding(windingRuleString)); | |
616 } | |
617 | |
618 void BaseRenderingContext2D::fill(Path2D* domPath, const String& windingRuleStri
ng) | |
619 { | |
620 drawPathInternal(domPath->path(), CanvasRenderingContext2DState::FillPaintTy
pe, parseWinding(windingRuleString)); | |
621 } | |
622 | |
623 void BaseRenderingContext2D::stroke() | |
624 { | |
625 drawPathInternal(m_path, CanvasRenderingContext2DState::StrokePaintType); | |
626 } | |
627 | |
628 void BaseRenderingContext2D::stroke(Path2D* domPath) | |
629 { | |
630 drawPathInternal(domPath->path(), CanvasRenderingContext2DState::StrokePaint
Type); | |
631 } | |
632 | |
633 void BaseRenderingContext2D::fillRect(double x, double y, double width, double h
eight) | |
634 { | |
635 if (!validateRectForCanvas(x, y, width, height)) | |
636 return; | |
637 | |
638 if (!drawingCanvas()) | |
639 return; | |
640 | |
641 SkRect rect = SkRect::MakeXYWH(x, y, width, height); | |
642 draw( | |
643 [&rect, this](SkCanvas* c, const SkPaint* paint) // draw lambda | |
644 { | |
645 c->drawRect(rect, *paint); | |
646 }, | |
647 [&rect, this](const SkIRect& clipBounds) // overdraw test lambda | |
648 { | |
649 return rectContainsTransformedRect(rect, clipBounds); | |
650 }, rect, CanvasRenderingContext2DState::FillPaintType); | |
651 } | |
652 | |
653 static void strokeRectOnCanvas(const FloatRect& rect, SkCanvas* canvas, const Sk
Paint* paint) | |
654 { | |
655 ASSERT(paint->getStyle() == SkPaint::kStroke_Style); | |
656 if ((rect.width() > 0) != (rect.height() > 0)) { | |
657 // When stroking, we must skip the zero-dimension segments | |
658 SkPath path; | |
659 path.moveTo(rect.x(), rect.y()); | |
660 path.lineTo(rect.maxX(), rect.maxY()); | |
661 path.close(); | |
662 canvas->drawPath(path, *paint); | |
663 return; | |
664 } | |
665 canvas->drawRect(rect, *paint); | |
666 } | |
667 | |
668 void BaseRenderingContext2D::strokeRect(double x, double y, double width, double
height) | |
669 { | |
670 if (!validateRectForCanvas(x, y, width, height)) | |
671 return; | |
672 | |
673 if (!drawingCanvas()) | |
674 return; | |
675 | |
676 SkRect rect = SkRect::MakeXYWH(x, y, width, height); | |
677 FloatRect bounds = rect; | |
678 inflateStrokeRect(bounds); | |
679 draw( | |
680 [&rect, this](SkCanvas* c, const SkPaint* paint) // draw lambda | |
681 { | |
682 strokeRectOnCanvas(rect, c, paint); | |
683 }, | |
684 [](const SkIRect& clipBounds) // overdraw test lambda | |
685 { | |
686 return false; | |
687 }, bounds, CanvasRenderingContext2DState::StrokePaintType); | |
688 } | |
689 | |
690 void BaseRenderingContext2D::clipInternal(const Path& path, const String& windin
gRuleString) | |
691 { | |
692 SkCanvas* c = drawingCanvas(); | |
693 if (!c) { | |
694 return; | |
695 } | |
696 if (!state().isTransformInvertible()) { | |
697 return; | |
698 } | |
699 | |
700 SkPath skPath = path.skPath(); | |
701 skPath.setFillType(parseWinding(windingRuleString)); | |
702 modifiableState().clipPath(skPath, m_clipAntialiasing); | |
703 c->clipPath(skPath, SkRegion::kIntersect_Op, m_clipAntialiasing == AntiAlias
ed); | |
704 if (ExpensiveCanvasHeuristicParameters::ComplexClipsAreExpensive && !skPath.
isRect(0) && hasImageBuffer()) { | |
705 imageBuffer()->setHasExpensiveOp(); | |
706 } | |
707 } | |
708 | |
709 void BaseRenderingContext2D::clip(const String& windingRuleString) | |
710 { | |
711 clipInternal(m_path, windingRuleString); | |
712 } | |
713 | |
714 void BaseRenderingContext2D::clip(Path2D* domPath, const String& windingRuleStri
ng) | |
715 { | |
716 clipInternal(domPath->path(), windingRuleString); | |
717 } | |
718 | |
719 bool BaseRenderingContext2D::isPointInPath(const double x, const double y, const
String& windingRuleString) | |
720 { | |
721 return isPointInPathInternal(m_path, x, y, windingRuleString); | |
722 } | |
723 | |
724 bool BaseRenderingContext2D::isPointInPath(Path2D* domPath, const double x, cons
t double y, const String& windingRuleString) | |
725 { | |
726 return isPointInPathInternal(domPath->path(), x, y, windingRuleString); | |
727 } | |
728 | |
729 bool BaseRenderingContext2D::isPointInPathInternal(const Path& path, const doubl
e x, const double y, const String& windingRuleString) | |
730 { | |
731 SkCanvas* c = drawingCanvas(); | |
732 if (!c) | |
733 return false; | |
734 if (!state().isTransformInvertible()) | |
735 return false; | |
736 | |
737 FloatPoint point(x, y); | |
738 if (!std::isfinite(point.x()) || !std::isfinite(point.y())) | |
739 return false; | |
740 AffineTransform ctm = state().transform(); | |
741 FloatPoint transformedPoint = ctm.inverse().mapPoint(point); | |
742 | |
743 return path.contains(transformedPoint, SkFillTypeToWindRule(parseWinding(win
dingRuleString))); | |
744 } | |
745 | |
746 bool BaseRenderingContext2D::isPointInStroke(const double x, const double y) | |
747 { | |
748 return isPointInStrokeInternal(m_path, x, y); | |
749 } | |
750 | |
751 bool BaseRenderingContext2D::isPointInStroke(Path2D* domPath, const double x, co
nst double y) | |
752 { | |
753 return isPointInStrokeInternal(domPath->path(), x, y); | |
754 } | |
755 | |
756 bool BaseRenderingContext2D::isPointInStrokeInternal(const Path& path, const dou
ble x, const double y) | |
757 { | |
758 SkCanvas* c = drawingCanvas(); | |
759 if (!c) | |
760 return false; | |
761 if (!state().isTransformInvertible()) | |
762 return false; | |
763 | |
764 FloatPoint point(x, y); | |
765 if (!std::isfinite(point.x()) || !std::isfinite(point.y())) | |
766 return false; | |
767 AffineTransform ctm = state().transform(); | |
768 FloatPoint transformedPoint = ctm.inverse().mapPoint(point); | |
769 | |
770 StrokeData strokeData; | |
771 strokeData.setThickness(state().lineWidth()); | |
772 strokeData.setLineCap(state().lineCap()); | |
773 strokeData.setLineJoin(state().lineJoin()); | |
774 strokeData.setMiterLimit(state().miterLimit()); | |
775 Vector<float> lineDash(state().lineDash().size()); | |
776 std::copy(state().lineDash().begin(), state().lineDash().end(), lineDash.beg
in()); | |
777 strokeData.setLineDash(lineDash, state().lineDashOffset()); | |
778 return path.strokeContains(transformedPoint, strokeData); | |
779 } | |
780 | |
781 void BaseRenderingContext2D::clearRect(double x, double y, double width, double
height) | |
782 { | |
783 if (!validateRectForCanvas(x, y, width, height)) | |
784 return; | |
785 | |
786 SkCanvas* c = drawingCanvas(); | |
787 if (!c) | |
788 return; | |
789 if (!state().isTransformInvertible()) | |
790 return; | |
791 | |
792 SkIRect clipBounds; | |
793 if (!c->getClipDeviceBounds(&clipBounds)) | |
794 return; | |
795 | |
796 SkPaint clearPaint; | |
797 clearPaint.setXfermodeMode(SkXfermode::kClear_Mode); | |
798 clearPaint.setStyle(SkPaint::kFill_Style); | |
799 FloatRect rect(x, y, width, height); | |
800 | |
801 if (rectContainsTransformedRect(rect, clipBounds)) { | |
802 checkOverdraw(rect, &clearPaint, CanvasRenderingContext2DState::NoImage,
ClipFill); | |
803 if (drawingCanvas()) | |
804 drawingCanvas()->drawRect(rect, clearPaint); | |
805 didDraw(clipBounds); | |
806 } else { | |
807 SkIRect dirtyRect; | |
808 if (computeDirtyRect(rect, clipBounds, &dirtyRect)) { | |
809 c->drawRect(rect, clearPaint); | |
810 didDraw(dirtyRect); | |
811 } | |
812 } | |
813 } | |
814 | |
815 static inline FloatRect normalizeRect(const FloatRect& rect) | |
816 { | |
817 return FloatRect(std::min(rect.x(), rect.maxX()), | |
818 std::min(rect.y(), rect.maxY()), | |
819 std::max(rect.width(), -rect.width()), | |
820 std::max(rect.height(), -rect.height())); | |
821 } | |
822 | |
823 static inline void clipRectsToImageRect(const FloatRect& imageRect, FloatRect* s
rcRect, FloatRect* dstRect) | |
824 { | |
825 if (imageRect.contains(*srcRect)) | |
826 return; | |
827 | |
828 // Compute the src to dst transform | |
829 FloatSize scale(dstRect->size().width() / srcRect->size().width(), dstRect->
size().height() / srcRect->size().height()); | |
830 FloatPoint scaledSrcLocation = srcRect->location(); | |
831 scaledSrcLocation.scale(scale.width(), scale.height()); | |
832 FloatSize offset = dstRect->location() - scaledSrcLocation; | |
833 | |
834 srcRect->intersect(imageRect); | |
835 | |
836 // To clip the destination rectangle in the same proportion, transform the c
lipped src rect | |
837 *dstRect = *srcRect; | |
838 dstRect->scale(scale.width(), scale.height()); | |
839 dstRect->move(offset); | |
840 } | |
841 | |
842 static inline CanvasImageSource* toImageSourceInternal(const CanvasImageSourceUn
ion& value) | |
843 { | |
844 if (value.isHTMLImageElement()) | |
845 return value.getAsHTMLImageElement().get(); | |
846 if (value.isHTMLVideoElement()) | |
847 return value.getAsHTMLVideoElement().get(); | |
848 if (value.isHTMLCanvasElement()) | |
849 return value.getAsHTMLCanvasElement().get(); | |
850 if (value.isImageBitmap()) | |
851 return value.getAsImageBitmap().get(); | |
852 ASSERT_NOT_REACHED(); | |
853 return nullptr; | |
854 } | |
855 | |
856 void BaseRenderingContext2D::drawImage(const CanvasImageSourceUnion& imageSource
, double x, double y, ExceptionState& exceptionState) | |
857 { | |
858 CanvasImageSource* imageSourceInternal = toImageSourceInternal(imageSource); | |
859 FloatSize sourceRectSize = imageSourceInternal->elementSize(); | |
860 FloatSize destRectSize = imageSourceInternal->defaultDestinationSize(); | |
861 drawImage(imageSourceInternal, 0, 0, sourceRectSize.width(), sourceRectSize.
height(), x, y, destRectSize.width(), destRectSize.height(), exceptionState); | |
862 } | |
863 | |
864 void BaseRenderingContext2D::drawImage(const CanvasImageSourceUnion& imageSource
, | |
865 double x, double y, double width, double height, ExceptionState& exceptionSt
ate) | |
866 { | |
867 CanvasImageSource* imageSourceInternal = toImageSourceInternal(imageSource); | |
868 FloatSize sourceRectSize = imageSourceInternal->elementSize(); | |
869 drawImage(imageSourceInternal, 0, 0, sourceRectSize.width(), sourceRectSize.
height(), x, y, width, height, exceptionState); | |
870 } | |
871 | |
872 void BaseRenderingContext2D::drawImage(const CanvasImageSourceUnion& imageSource
, | |
873 double sx, double sy, double sw, double sh, | |
874 double dx, double dy, double dw, double dh, ExceptionState& exceptionState) | |
875 { | |
876 CanvasImageSource* imageSourceInternal = toImageSourceInternal(imageSource); | |
877 drawImage(imageSourceInternal, sx, sy, sw, sh, dx, dy, dw, dh, exceptionStat
e); | |
878 } | |
879 | |
880 bool BaseRenderingContext2D::shouldDrawImageAntialiased(const FloatRect& destRec
t) const | |
881 { | |
882 if (!state().shouldAntialias()) | |
883 return false; | |
884 SkCanvas* c = drawingCanvas(); | |
885 ASSERT(c); | |
886 | |
887 const SkMatrix &ctm = c->getTotalMatrix(); | |
888 // Don't disable anti-aliasing if we're rotated or skewed. | |
889 if (!ctm.rectStaysRect()) | |
890 return true; | |
891 // Check if the dimensions of the destination are "small" (less than one | |
892 // device pixel). To prevent sudden drop-outs. Since we know that | |
893 // kRectStaysRect_Mask is set, the matrix either has scale and no skew or | |
894 // vice versa. We can query the kAffine_Mask flag to determine which case | |
895 // it is. | |
896 // FIXME: This queries the CTM while drawing, which is generally | |
897 // discouraged. Always drawing with AA can negatively impact performance | |
898 // though - that's why it's not always on. | |
899 SkScalar widthExpansion, heightExpansion; | |
900 if (ctm.getType() & SkMatrix::kAffine_Mask) | |
901 widthExpansion = ctm[SkMatrix::kMSkewY], heightExpansion = ctm[SkMatrix:
:kMSkewX]; | |
902 else | |
903 widthExpansion = ctm[SkMatrix::kMScaleX], heightExpansion = ctm[SkMatrix
::kMScaleY]; | |
904 return destRect.width() * fabs(widthExpansion) < 1 || destRect.height() * fa
bs(heightExpansion) < 1; | |
905 } | |
906 | |
907 void BaseRenderingContext2D::drawImageInternal(SkCanvas* c, CanvasImageSource* i
mageSource, Image* image, const FloatRect& srcRect, const FloatRect& dstRect, co
nst SkPaint* paint) | |
908 { | |
909 int initialSaveCount = c->getSaveCount(); | |
910 SkPaint imagePaint = *paint; | |
911 | |
912 if (paint->getImageFilter()) { | |
913 SkMatrix invCtm; | |
914 if (!c->getTotalMatrix().invert(&invCtm)) { | |
915 // There is an earlier check for invertibility, but the arithmetic | |
916 // in AffineTransform is not exactly identical, so it is possible | |
917 // for SkMatrix to find the transform to be non-invertible at this s
tage. | |
918 // crbug.com/504687 | |
919 return; | |
920 } | |
921 SkRect bounds = dstRect; | |
922 SkPaint layerPaint; | |
923 layerPaint.setXfermode(paint->getXfermode()); | |
924 SkAutoTUnref<SkImageFilter> localFilter(paint->getImageFilter()->newWith
LocalMatrix(invCtm)); | |
925 layerPaint.setImageFilter(localFilter); | |
926 c->saveLayer(&bounds, &layerPaint); | |
927 imagePaint.setXfermodeMode(SkXfermode::kSrcOver_Mode); | |
928 imagePaint.setImageFilter(nullptr); | |
929 } | |
930 | |
931 if (!imageSource->isVideoElement()) { | |
932 imagePaint.setAntiAlias(shouldDrawImageAntialiased(dstRect)); | |
933 image->draw(c, imagePaint, dstRect, srcRect, DoNotRespectImageOrientatio
n, Image::DoNotClampImageToSourceRect); | |
934 } else { | |
935 c->save(); | |
936 c->clipRect(dstRect); | |
937 c->translate(dstRect.x(), dstRect.y()); | |
938 c->scale(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.h
eight()); | |
939 c->translate(-srcRect.x(), -srcRect.y()); | |
940 HTMLVideoElement* video = static_cast<HTMLVideoElement*>(imageSource); | |
941 video->paintCurrentFrame(c, IntRect(IntPoint(), IntSize(video->videoWidt
h(), video->videoHeight())), &imagePaint); | |
942 } | |
943 | |
944 c->restoreToCount(initialSaveCount); | |
945 } | |
946 | |
947 bool shouldDisableDeferral(CanvasImageSource* imageSource, DisableDeferralReason
* reason) | |
948 { | |
949 ASSERT(reason); | |
950 ASSERT(*reason == DisableDeferralReasonUnknown); | |
951 | |
952 if (imageSource->isVideoElement()) { | |
953 *reason = DisableDeferralReasonDrawImageOfVideo; | |
954 return true; | |
955 } | |
956 if (imageSource->isCanvasElement()) { | |
957 HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(imageSource)
; | |
958 if (canvas->isAnimated2D()) { | |
959 *reason = DisableDeferralReasonDrawImageOfAnimated2dCanvas; | |
960 return true; | |
961 } | |
962 } | |
963 return false; | |
964 } | |
965 | |
966 void BaseRenderingContext2D::drawImage(CanvasImageSource* imageSource, | |
967 double sx, double sy, double sw, double sh, | |
968 double dx, double dy, double dw, double dh, ExceptionState& exceptionState) | |
969 { | |
970 if (!drawingCanvas()) | |
971 return; | |
972 | |
973 RefPtr<Image> image; | |
974 SourceImageStatus sourceImageStatus = InvalidSourceImageStatus; | |
975 if (!imageSource->isVideoElement()) { | |
976 AccelerationHint hint = imageBuffer()->isAccelerated() ? PreferAccelerat
ion : PreferNoAcceleration; | |
977 image = imageSource->getSourceImageForCanvas(&sourceImageStatus, hint, S
napshotReasonDrawImage); | |
978 if (sourceImageStatus == UndecodableSourceImageStatus) | |
979 exceptionState.throwDOMException(InvalidStateError, "The HTMLImageEl
ement provided is in the 'broken' state."); | |
980 if (!image || !image->width() || !image->height()) | |
981 return; | |
982 } else { | |
983 if (!static_cast<HTMLVideoElement*>(imageSource)->hasAvailableVideoFrame
()) | |
984 return; | |
985 } | |
986 | |
987 if (!std::isfinite(dx) || !std::isfinite(dy) || !std::isfinite(dw) || !std::
isfinite(dh) | |
988 || !std::isfinite(sx) || !std::isfinite(sy) || !std::isfinite(sw) || !st
d::isfinite(sh) | |
989 || !dw || !dh || !sw || !sh) | |
990 return; | |
991 | |
992 FloatRect srcRect = normalizeRect(FloatRect(sx, sy, sw, sh)); | |
993 FloatRect dstRect = normalizeRect(FloatRect(dx, dy, dw, dh)); | |
994 | |
995 clipRectsToImageRect(FloatRect(FloatPoint(), imageSource->elementSize()), &s
rcRect, &dstRect); | |
996 | |
997 imageSource->adjustDrawRects(&srcRect, &dstRect); | |
998 | |
999 if (srcRect.isEmpty()) | |
1000 return; | |
1001 | |
1002 DisableDeferralReason reason = DisableDeferralReasonUnknown; | |
1003 if (shouldDisableDeferral(imageSource, &reason) || image->isTextureBacked()) | |
1004 disableDeferral(reason); | |
1005 | |
1006 validateStateStack(); | |
1007 | |
1008 draw( | |
1009 [this, &imageSource, &image, &srcRect, dstRect](SkCanvas* c, const SkPai
nt* paint) // draw lambda | |
1010 { | |
1011 drawImageInternal(c, imageSource, image.get(), srcRect, dstRect, pai
nt); | |
1012 }, | |
1013 [this, &dstRect](const SkIRect& clipBounds) // overdraw test lambda | |
1014 { | |
1015 return rectContainsTransformedRect(dstRect, clipBounds); | |
1016 }, dstRect, CanvasRenderingContext2DState::ImagePaintType, | |
1017 imageSource->isOpaque() ? CanvasRenderingContext2DState::OpaqueImage : C
anvasRenderingContext2DState::NonOpaqueImage); | |
1018 | |
1019 validateStateStack(); | |
1020 | |
1021 bool isExpensive = false; | |
1022 | |
1023 if (ExpensiveCanvasHeuristicParameters::SVGImageSourcesAreExpensive && image
Source->isSVGSource()) | |
1024 isExpensive = true; | |
1025 | |
1026 if (imageSource->elementSize().width() * imageSource->elementSize().height()
> width() * height() * ExpensiveCanvasHeuristicParameters::ExpensiveImageSizeRa
tio) | |
1027 isExpensive = true; | |
1028 | |
1029 if (isExpensive) { | |
1030 ImageBuffer* buffer = imageBuffer(); | |
1031 if (buffer) | |
1032 buffer->setHasExpensiveOp(); | |
1033 } | |
1034 | |
1035 if (imageSource->isCanvasElement() && static_cast<HTMLCanvasElement*>(imageS
ource)->is3D()) { | |
1036 // WebGL to 2D canvas: must flush graphics context to prevent a race | |
1037 // FIXME: crbug.com/516331 Fix the underlying synchronization issue so t
his flush can be eliminated. | |
1038 imageBuffer()->flushGpu(FlushReasonDrawImageOfWebGL); | |
1039 } | |
1040 | |
1041 if (originClean() && wouldTaintOrigin(imageSource)) | |
1042 setOriginTainted(); | |
1043 } | |
1044 | |
1045 void BaseRenderingContext2D::clearCanvas() | |
1046 { | |
1047 FloatRect canvasRect(0, 0, width(), height()); | |
1048 checkOverdraw(canvasRect, 0, CanvasRenderingContext2DState::NoImage, ClipFil
l); | |
1049 SkCanvas* c = drawingCanvas(); | |
1050 if (c) | |
1051 c->clear(hasAlpha() ? SK_ColorTRANSPARENT : SK_ColorBLACK); | |
1052 } | |
1053 | |
1054 bool BaseRenderingContext2D::rectContainsTransformedRect(const FloatRect& rect,
const SkIRect& transformedRect) const | |
1055 { | |
1056 FloatQuad quad(rect); | |
1057 FloatQuad transformedQuad(FloatRect(transformedRect.x(), transformedRect.y()
, transformedRect.width(), transformedRect.height())); | |
1058 return state().transform().mapQuad(quad).containsQuad(transformedQuad); | |
1059 } | |
1060 | |
1061 CanvasGradient* BaseRenderingContext2D::createLinearGradient(double x0, double y
0, double x1, double y1) | |
1062 { | |
1063 CanvasGradient* gradient = CanvasGradient::create(FloatPoint(x0, y0), FloatP
oint(x1, y1)); | |
1064 return gradient; | |
1065 } | |
1066 | |
1067 CanvasGradient* BaseRenderingContext2D::createRadialGradient(double x0, double y
0, double r0, double x1, double y1, double r1, ExceptionState& exceptionState) | |
1068 { | |
1069 if (r0 < 0 || r1 < 0) { | |
1070 exceptionState.throwDOMException(IndexSizeError, String::format("The %s
provided is less than 0.", r0 < 0 ? "r0" : "r1")); | |
1071 return nullptr; | |
1072 } | |
1073 | |
1074 CanvasGradient* gradient = CanvasGradient::create(FloatPoint(x0, y0), r0, Fl
oatPoint(x1, y1), r1); | |
1075 return gradient; | |
1076 } | |
1077 | |
1078 CanvasPattern* BaseRenderingContext2D::createPattern(const CanvasImageSourceUnio
n& imageSource, const String& repetitionType, ExceptionState& exceptionState) | |
1079 { | |
1080 Pattern::RepeatMode repeatMode = CanvasPattern::parseRepetitionType(repetiti
onType, exceptionState); | |
1081 if (exceptionState.hadException()) | |
1082 return nullptr; | |
1083 | |
1084 SourceImageStatus status; | |
1085 CanvasImageSource* imageSourceInternal = toImageSourceInternal(imageSource); | |
1086 RefPtr<Image> imageForRendering = imageSourceInternal->getSourceImageForCanv
as(&status, PreferNoAcceleration, SnapshotReasonCreatePattern); | |
1087 | |
1088 switch (status) { | |
1089 case NormalSourceImageStatus: | |
1090 break; | |
1091 case ZeroSizeCanvasSourceImageStatus: | |
1092 exceptionState.throwDOMException(InvalidStateError, String::format("The
canvas %s is 0.", imageSourceInternal->elementSize().width() ? "height" : "width
")); | |
1093 return nullptr; | |
1094 case UndecodableSourceImageStatus: | |
1095 exceptionState.throwDOMException(InvalidStateError, "Source image is in
the 'broken' state."); | |
1096 return nullptr; | |
1097 case InvalidSourceImageStatus: | |
1098 imageForRendering = Image::nullImage(); | |
1099 break; | |
1100 case IncompleteSourceImageStatus: | |
1101 return nullptr; | |
1102 default: | |
1103 ASSERT_NOT_REACHED(); | |
1104 return nullptr; | |
1105 } | |
1106 ASSERT(imageForRendering); | |
1107 | |
1108 bool originClean = !wouldTaintOrigin(imageSourceInternal); | |
1109 | |
1110 return CanvasPattern::create(imageForRendering.release(), repeatMode, origin
Clean); | |
1111 } | |
1112 | |
1113 bool BaseRenderingContext2D::computeDirtyRect(const FloatRect& localRect, SkIRec
t* dirtyRect) | |
1114 { | |
1115 SkIRect clipBounds; | |
1116 if (!drawingCanvas()->getClipDeviceBounds(&clipBounds)) | |
1117 return false; | |
1118 return computeDirtyRect(localRect, clipBounds, dirtyRect); | |
1119 } | |
1120 | |
1121 bool BaseRenderingContext2D::computeDirtyRect(const FloatRect& localRect, const
SkIRect& transformedClipBounds, SkIRect* dirtyRect) | |
1122 { | |
1123 FloatRect canvasRect = state().transform().mapRect(localRect); | |
1124 | |
1125 if (alphaChannel(state().shadowColor())) { | |
1126 FloatRect shadowRect(canvasRect); | |
1127 shadowRect.move(state().shadowOffset()); | |
1128 shadowRect.inflate(state().shadowBlur()); | |
1129 canvasRect.unite(shadowRect); | |
1130 } | |
1131 | |
1132 SkIRect canvasIRect; | |
1133 static_cast<SkRect>(canvasRect).roundOut(&canvasIRect); | |
1134 if (!canvasIRect.intersect(transformedClipBounds)) | |
1135 return false; | |
1136 | |
1137 if (dirtyRect) | |
1138 *dirtyRect = canvasIRect; | |
1139 | |
1140 return true; | |
1141 } | |
1142 | |
1143 ImageData* BaseRenderingContext2D::createImageData(ImageData* imageData) const | |
1144 { | |
1145 return ImageData::create(imageData->size()); | |
1146 } | |
1147 | |
1148 ImageData* BaseRenderingContext2D::createImageData(double sw, double sh, Excepti
onState& exceptionState) const | |
1149 { | |
1150 if (!sw || !sh) { | |
1151 exceptionState.throwDOMException(IndexSizeError, String::format("The sou
rce %s is 0.", sw ? "height" : "width")); | |
1152 return nullptr; | |
1153 } | |
1154 | |
1155 FloatSize logicalSize(fabs(sw), fabs(sh)); | |
1156 if (!logicalSize.isExpressibleAsIntSize()) | |
1157 return nullptr; | |
1158 | |
1159 IntSize size = expandedIntSize(logicalSize); | |
1160 if (size.width() < 1) | |
1161 size.setWidth(1); | |
1162 if (size.height() < 1) | |
1163 size.setHeight(1); | |
1164 | |
1165 return ImageData::create(size); | |
1166 } | |
1167 | |
1168 ImageData* BaseRenderingContext2D::getImageData(double sx, double sy, double sw,
double sh, ExceptionState& exceptionState) const | |
1169 { | |
1170 if (!originClean()) | |
1171 exceptionState.throwSecurityError("The canvas has been tainted by cross-
origin data."); | |
1172 else if (!sw || !sh) | |
1173 exceptionState.throwDOMException(IndexSizeError, String::format("The sou
rce %s is 0.", sw ? "height" : "width")); | |
1174 | |
1175 if (exceptionState.hadException()) | |
1176 return nullptr; | |
1177 | |
1178 if (sw < 0) { | |
1179 sx += sw; | |
1180 sw = -sw; | |
1181 } | |
1182 if (sh < 0) { | |
1183 sy += sh; | |
1184 sh = -sh; | |
1185 } | |
1186 | |
1187 FloatRect logicalRect(sx, sy, sw, sh); | |
1188 if (logicalRect.width() < 1) | |
1189 logicalRect.setWidth(1); | |
1190 if (logicalRect.height() < 1) | |
1191 logicalRect.setHeight(1); | |
1192 if (!logicalRect.isExpressibleAsIntRect()) | |
1193 return nullptr; | |
1194 | |
1195 IntRect imageDataRect = enclosingIntRect(logicalRect); | |
1196 ImageBuffer* buffer = imageBuffer(); | |
1197 if (!buffer || isContextLost()) | |
1198 return ImageData::create(imageDataRect.size()); | |
1199 | |
1200 WTF::ArrayBufferContents contents; | |
1201 if (!buffer->getImageData(Unmultiplied, imageDataRect, contents)) | |
1202 return nullptr; | |
1203 | |
1204 RefPtr<DOMArrayBuffer> arrayBuffer = DOMArrayBuffer::create(contents); | |
1205 return ImageData::create( | |
1206 imageDataRect.size(), | |
1207 DOMUint8ClampedArray::create(arrayBuffer, 0, arrayBuffer->byteLength()))
; | |
1208 } | |
1209 | |
1210 void BaseRenderingContext2D::putImageData(ImageData* data, double dx, double dy,
ExceptionState& exceptionState) | |
1211 { | |
1212 putImageData(data, dx, dy, 0, 0, data->width(), data->height(), exceptionSta
te); | |
1213 } | |
1214 | |
1215 void BaseRenderingContext2D::putImageData(ImageData* data, double dx, double dy,
double dirtyX, double dirtyY, double dirtyWidth, double dirtyHeight, ExceptionS
tate& exceptionState) | |
1216 { | |
1217 if (data->data()->bufferBase()->isNeutered()) { | |
1218 exceptionState.throwDOMException(InvalidStateError, "The source data has
been neutered."); | |
1219 return; | |
1220 } | |
1221 ImageBuffer* buffer = imageBuffer(); | |
1222 if (!buffer) | |
1223 return; | |
1224 | |
1225 if (dirtyWidth < 0) { | |
1226 dirtyX += dirtyWidth; | |
1227 dirtyWidth = -dirtyWidth; | |
1228 } | |
1229 | |
1230 if (dirtyHeight < 0) { | |
1231 dirtyY += dirtyHeight; | |
1232 dirtyHeight = -dirtyHeight; | |
1233 } | |
1234 | |
1235 FloatRect clipRect(dirtyX, dirtyY, dirtyWidth, dirtyHeight); | |
1236 clipRect.intersect(IntRect(0, 0, data->width(), data->height())); | |
1237 IntSize destOffset(static_cast<int>(dx), static_cast<int>(dy)); | |
1238 IntRect destRect = enclosingIntRect(clipRect); | |
1239 destRect.move(destOffset); | |
1240 destRect.intersect(IntRect(IntPoint(), buffer->size())); | |
1241 if (destRect.isEmpty()) | |
1242 return; | |
1243 IntRect sourceRect(destRect); | |
1244 sourceRect.move(-destOffset); | |
1245 | |
1246 checkOverdraw(destRect, 0, CanvasRenderingContext2DState::NoImage, Untransfo
rmedUnclippedFill); | |
1247 | |
1248 buffer->putByteArray(Unmultiplied, data->data()->data(), IntSize(data->width
(), data->height()), sourceRect, IntPoint(destOffset)); | |
1249 | |
1250 didDraw(destRect); | |
1251 } | |
1252 | |
1253 void BaseRenderingContext2D::inflateStrokeRect(FloatRect& rect) const | |
1254 { | |
1255 // Fast approximation of the stroke's bounding rect. | |
1256 // This yields a slightly oversized rect but is very fast | |
1257 // compared to Path::strokeBoundingRect(). | |
1258 static const double root2 = sqrtf(2); | |
1259 double delta = state().lineWidth() / 2; | |
1260 if (state().lineJoin() == MiterJoin) | |
1261 delta *= state().miterLimit(); | |
1262 else if (state().lineCap() == SquareCap) | |
1263 delta *= root2; | |
1264 | |
1265 rect.inflate(delta); | |
1266 } | |
1267 | |
1268 bool BaseRenderingContext2D::imageSmoothingEnabled() const | |
1269 { | |
1270 return state().imageSmoothingEnabled(); | |
1271 } | |
1272 | |
1273 void BaseRenderingContext2D::setImageSmoothingEnabled(bool enabled) | |
1274 { | |
1275 if (enabled == state().imageSmoothingEnabled()) | |
1276 return; | |
1277 | |
1278 modifiableState().setImageSmoothingEnabled(enabled); | |
1279 } | |
1280 | |
1281 String BaseRenderingContext2D::imageSmoothingQuality() const | |
1282 { | |
1283 return state().imageSmoothingQuality(); | |
1284 } | |
1285 | |
1286 void BaseRenderingContext2D::setImageSmoothingQuality(const String& quality) | |
1287 { | |
1288 if (quality == state().imageSmoothingQuality()) | |
1289 return; | |
1290 | |
1291 modifiableState().setImageSmoothingQuality(quality); | |
1292 } | |
1293 | |
1294 void BaseRenderingContext2D::checkOverdraw(const SkRect& rect, const SkPaint* pa
int, CanvasRenderingContext2DState::ImageType imageType, DrawType drawType) | |
1295 { | |
1296 SkCanvas* c = drawingCanvas(); | |
1297 if (!c || !imageBuffer()->isRecording()) | |
1298 return; | |
1299 | |
1300 SkRect deviceRect; | |
1301 if (drawType == UntransformedUnclippedFill) { | |
1302 deviceRect = rect; | |
1303 } else { | |
1304 ASSERT(drawType == ClipFill); | |
1305 if (state().hasComplexClip()) | |
1306 return; | |
1307 | |
1308 SkIRect skIBounds; | |
1309 if (!c->getClipDeviceBounds(&skIBounds)) | |
1310 return; | |
1311 deviceRect = SkRect::Make(skIBounds); | |
1312 } | |
1313 | |
1314 const SkImageInfo& imageInfo = c->imageInfo(); | |
1315 if (!deviceRect.contains(SkRect::MakeWH(imageInfo.width(), imageInfo.height(
)))) | |
1316 return; | |
1317 | |
1318 bool isSourceOver = true; | |
1319 unsigned alpha = 0xFF; | |
1320 if (paint) { | |
1321 if (paint->getLooper() || paint->getImageFilter() || paint->getMaskFilte
r()) | |
1322 return; | |
1323 | |
1324 SkXfermode* xfermode = paint->getXfermode(); | |
1325 if (xfermode) { | |
1326 SkXfermode::Mode mode; | |
1327 if (xfermode->asMode(&mode)) { | |
1328 isSourceOver = mode == SkXfermode::kSrcOver_Mode; | |
1329 if (!isSourceOver && mode != SkXfermode::kSrc_Mode && mode != Sk
Xfermode::kClear_Mode) | |
1330 return; // The code below only knows how to handle Src, SrcO
ver, and Clear | |
1331 } else { | |
1332 // unknown xfermode | |
1333 ASSERT_NOT_REACHED(); | |
1334 return; | |
1335 } | |
1336 } | |
1337 | |
1338 alpha = paint->getAlpha(); | |
1339 | |
1340 if (isSourceOver && imageType == CanvasRenderingContext2DState::NoImage)
{ | |
1341 SkShader* shader = paint->getShader(); | |
1342 if (shader) { | |
1343 if (shader->isOpaque() && alpha == 0xFF) | |
1344 imageBuffer()->willOverwriteCanvas(); | |
1345 return; | |
1346 } | |
1347 } | |
1348 } | |
1349 | |
1350 if (isSourceOver) { | |
1351 // With source over, we need to certify that alpha == 0xFF for all pixel
s | |
1352 if (imageType == CanvasRenderingContext2DState::NonOpaqueImage) | |
1353 return; | |
1354 if (alpha < 0xFF) | |
1355 return; | |
1356 } | |
1357 | |
1358 imageBuffer()->willOverwriteCanvas(); | |
1359 } | |
1360 | |
1361 DEFINE_TRACE(BaseRenderingContext2D) | |
1362 { | |
1363 visitor->trace(m_stateStack); | |
1364 } | |
1365 | |
1366 } // namespace blink | |
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