Bug 78074 – REGRESSION: unbalanced transparency layers for clipPath

• Status: RESOLVED
• Resolution: FIXED
• Component: SVG

[Dirk Schulze]

On calling the example above I get an assertion about unbalanced transparency layers. This example used to work in the past on debug builds.


Feb  7 21:08:58 dschulze-MacBookPro WebProcess[5256] <Error>: CGContextEndTransparencyLayer: unbalanced transparency layers.
ASSERTION FAILED: m_transparencyCount > 0
/Users/dschulze/Downloads/webkit/Source/WebCore/platform/graphics/GraphicsContext.cpp(346) : void WebCore::GraphicsContext::endTransparencyLayer()
1   0x10fd1ea0f WebCore::GraphicsContext::endTransparencyLayer()
2   0x1108d444e WebCore::SVGRenderSupport::finishRenderSVGContent(WebCore::RenderObject*, WebCore::PaintInfo&, WebCore::GraphicsContext*)
3   0x1108ed6ad WebCore::RenderSVGShape::paint(WebCore::PaintInfo&, WebCore::IntPoint const&)
4   0x1108d3b49 WebCore::RenderSVGContainer::paint(WebCore::PaintInfo&, WebCore::IntPoint const&)
5   0x1108d3b49 WebCore::RenderSVGContainer::paint(WebCore::PaintInfo&, WebCore::IntPoint const&)
6   0x1108de7d8 WebCore::SVGImageBufferTools::renderSubtreeToImageBuffer(WebCore::ImageBuffer*, WebCore::RenderObject*, WebCore::AffineTransform const&)
7   0x1108de2ab WebCore::RenderSVGResourceClipper::drawContentIntoMaskImage(WebCore::ClipperData*, WebCore::FloatRect const&)
8   0x1108dd528 WebCore::RenderSVGResourceClipper::applyClippingToContext(WebCore::RenderObject*, WebCore::FloatRect const&, WebCore::FloatRect const&, WebCore::GraphicsContext*)
9   0x1108dd1b4 WebCore::RenderSVGResourceClipper::applyResource(WebCore::RenderObject*, WebCore::RenderStyle*, WebCore::GraphicsContext*&, unsigned short)
10  0x1108d41da WebCore::SVGRenderSupport::prepareToRenderSVGContent(WebCore::RenderObject*, WebCore::PaintInfo&)
11  0x1108d6ea8 WebCore::RenderSVGImage::paint(WebCore::PaintInfo&, WebCore::IntPoint const&)
12  0x1107c7f20 WebCore::RenderBox::paint(WebCore::PaintInfo&, WebCore::IntPoint const&)
13  0x1108ea1e4 WebCore::RenderSVGRoot::paintReplaced(WebCore::PaintInfo&, WebCore::IntPoint const&)
14  0x1108b5a28 WebCore::RenderReplaced::paint(WebCore::PaintInfo&, WebCore::IntPoint const&)
15  0x110852758 WebCore::RenderLayer::paintLayerContents(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, WTF::HashMap<WebCore::OverlapTestRequestClient*, WebCore::IntRect, WTF::PtrHash<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::IntRect> >*, unsigned int)
16  0x110851cf3 WebCore::RenderLayer::paintLayerContentsAndReflection(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, WTF::HashMap<WebCore::OverlapTestRequestClient*, WebCore::IntRect, WTF::PtrHash<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::IntRect> >*, unsigned int)
17  0x1108513f7 WebCore::RenderLayer::paintLayer(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, WTF::HashMap<WebCore::OverlapTestRequestClient*, WebCore::IntRect, WTF::PtrHash<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::IntRect> >*, unsigned int)
18  0x1108537ff WebCore::RenderLayer::paintList(WTF::Vector<WebCore::RenderLayer*, 0ul>*, WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, WTF::HashMap<WebCore::OverlapTestRequestClient*, WebCore::IntRect, WTF::PtrHash<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::IntRect> >*, unsigned int)
19  0x1108529cf WebCore::RenderLayer::paintLayerContents(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, WTF::HashMap<WebCore::OverlapTestRequestClient*, WebCore::IntRect, WTF::PtrHash<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::IntRect> >*, unsigned int)
20  0x110851cf3 WebCore::RenderLayer::paintLayerContentsAndReflection(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, WTF::HashMap<WebCore::OverlapTestRequestClient*, WebCore::IntRect, WTF::PtrHash<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::IntRect> >*, unsigned int)
21  0x1108513f7 WebCore::RenderLayer::paintLayer(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, WTF::HashMap<WebCore::OverlapTestRequestClient*, WebCore::IntRect, WTF::PtrHash<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::IntRect> >*, unsigned int)
22  0x110850d7f WebCore::RenderLayer::paint(WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, unsigned int)
23  0x10fce57b5 WebCore::FrameView::paintContents(WebCore::GraphicsContext*, WebCore::IntRect const&)
24  0x110a4e903 WebCore::ScrollView::paint(WebCore::GraphicsContext*, WebCore::IntRect const&)
25  0x10dd31d96 WebKit::WebPage::drawRect(WebCore::GraphicsContext&, WebCore::IntRect const&)
26  0x10db5833a WebKit::DrawingAreaImpl::display(WebKit::UpdateInfo&)
27  0x10db570d9 WebKit::DrawingAreaImpl::display()
28  0x10db55bb5 WebKit::DrawingAreaImpl::displayTimerFired()
29  0x10db59d46 WebCore::RunLoop::Timer<WebKit::DrawingAreaImpl>::fired()
30  0x1109e7f7d WebCore::RunLoop::TimerBase::timerFired(__CFRunLoopTimer*, void*)
31  0x7fff86687c24 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__

[Nikolas Zimmermann]

Created attachment 127570 [details]
Patch

[Nikolas Zimmermann]

Anyone?

[Zoltan Herczeg]

Comment on attachment 127570 [details]
Patch

r=me

[Nikolas Zimmermann]

Committed r108490: <http://trac.webkit.org/changeset/108490>