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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 | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1732923002:
Revert of Pull up a subset of CanvasRenderingContext2D into BaseRenderingContext2D. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master