213403 2020-06-19 13:30:30 -0700 [CG] REGRESSION (r256892): Luminance SVG mask is not applied when accelerated drawing is enabled 2020-06-19 17:00:07 -0700 1 1 1 Unclassified WebKit SVG WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 sabouhallawa sabouhallawa darin dino graouts simon.fraser zimmermann oldest_to_newest 1664487 0 402317 sabouhallawa 2020-06-19 13:30:30 -0700 Created attachment 402317 test case Open the attached test case. Result: A 200x200 green rectangle Expected: A 200x200 green rectangle with a 100x100 white hole in the middle. 1664488 1 sabouhallawa 2020-06-19 13:34:21 -0700 This is a regression of r256892. Before this change void ImageBuffer::genericConvertToLuminanceMask() { auto srcPixelArray = getUnmultipliedImageData(luminanceRect); ... } RefPtr<Uint8ClampedArray> ImageBuffer::getUnmultipliedImageData(const IntRect& rect, IntSize* pixelArrayDimensions, CoordinateSystem coordinateSystem) const { if (context().isAcceleratedContext()) flushContext(); } After this change: void ConcreteImageBuffer::convertToLuminanceMask() override { if (auto* backend = ensureBackendCreated()) { flushDrawingContext(); backend->convertToLuminanceMask(); } } And ImageBufferBackend::convertToLuminanceMask() does not do any flushing. Notice flushDrawingContext() flushes only the drawing items in the display list if they exist. If the ImageBuffer is backed by an IOSurface, convertToLuminanceMask() will act on non up-to-date backend. So we need to call ConcreteImageBuffer::flushContext() instead. 1664490 2 sabouhallawa 2020-06-19 13:38:52 -0700 <rdar://problem/64489419> 1664491 3 402318 sabouhallawa 2020-06-19 13:41:47 -0700 Created attachment 402318 Patch 1664499 4 402318 darin 2020-06-19 14:00:54 -0700 Comment on attachment 402318 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=402318&action=review > Source/WebCore/platform/graphics/ConcreteImageBuffer.h:183 > + const_cast<ConcreteImageBuffer&>(*this).flushContext(); This is not a const member function — why is the const_cast needed? 1664508 5 402318 simon.fraser 2020-06-19 14:10:06 -0700 Comment on attachment 402318 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=402318&action=review > Source/WebCore/platform/graphics/ConcreteImageBuffer.h:184 > backend->convertToLuminanceMask(); Why doesn't the backend flush inside convertToLuminanceMask()? 1664514 6 402324 sabouhallawa 2020-06-19 14:17:09 -0700 Created attachment 402324 Patch 1664527 7 402318 sabouhallawa 2020-06-19 14:36:42 -0700 Comment on attachment 402318 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=402318&action=review >> Source/WebCore/platform/graphics/ConcreteImageBuffer.h:183 >> + const_cast<ConcreteImageBuffer&>(*this).flushContext(); > > This is not a const member function — why is the const_cast needed? Copy/paste mistake. Fixed. >> Source/WebCore/platform/graphics/ConcreteImageBuffer.h:184 >> backend->convertToLuminanceMask(); > > Why doesn't the backend flush inside convertToLuminanceMask()? ConcreteImageBuffer::flushContext() may call DisplayList::ImageBuffer::flushDrawingContext() which replays back the display items before calling ImageBufferBackend::flushContext(). If I move the call to flushContext() to ImageBufferBackend::convertToLuminanceMask(), replaying the display items back will not be possible. 1664618 8 ews-feeder 2020-06-19 17:00:06 -0700 Committed r263297: <https://trac.webkit.org/changeset/263297> All reviewed patches have been landed. Closing bug and clearing flags on attachment 402324. 402317 2020-06-19 13:30:30 -0700 2020-06-19 13:30:30 -0700 test case css-svg-mask.html text/html 490 sabouhallawa PHN0eWxlPgogICAgLmJveC13aXRoLWhvbGUgewogICAgICAgIGhlaWdodDogMjAwcHg7CiAgICAg ICAgd2lkdGg6IDIwMHB4OwogICAgICAgIGJhY2tncm91bmQtY29sb3I6IGdyZWVuOwogICAgICAg IC13ZWJraXQtbWFzazogdXJsKCdkYXRhOmltYWdlL3N2Zyt4bWw7dXRmOCwgXAogICAgICAgIAk8 c3ZnIHZpZXdCb3g9IjAgMCAyMDAgMjAwIiB2ZXJzaW9uPSIxLjEiIHhtbG5zPSJodHRwOi8vd3d3 LnczLm9yZy8yMDAwL3N2ZyI+IFwKICAgICAgICAJCTxyZWN0IHdpZHRoPSIxMDAlIiBoZWlnaHQ9 IjEwMCUiIGZpbGw9IndoaXRlIi8+IFwKICAgICAgICAJCTxyZWN0IHg9IjI1JSIgeT0iMjUlIiB3 aWR0aD0iNTAlIiBoZWlnaHQ9IjUwJSIgZmlsbD0iYmxhY2siLz4gXAogICAgICAgIAk8L3N2Zz4n KSBsdW1pbmFuY2Ugbm8tcmVwZWF0OwogICAgfQo8L3N0eWxlPgo8Ym9keT4KICAgIDxkaXYgY2xh c3M9ImJveC13aXRoLWhvbGUiPjwvZGl2Pgo8L2JvZHk+Cg== 402318 2020-06-19 13:41:47 -0700 2020-06-19 14:17:07 -0700 Patch bug-213403-20200619134146.patch text/plain 3603 sabouhallawa 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