Bug 197731 – Sometimes we hit ASSERT(!parentClipRect.isInfinite()) in RenderLayerBacking::computeParentGraphicsLayerRect

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: Compositing

[Simon Fraser (smfr)]

At webkit r245059, we sometimes assert at ASSERT(!parentClipRect.isInfinite()) in RenderLayerBacking::computeParentGraphicsLayerRect.

I can reproduce this in DumpRenderTree with accessibility/media-element.html

[Simon Fraser (smfr)]

This code runs when we have a m_ancestorClippingLayer, and we make one based on the result of RenderLayerCompositor::clippedByAncestor(), which uses:

layer.backgroundClipRect(RenderLayer::ClipRectsContext(computeClipRoot, TemporaryClipRects)).isInfinite()

However, RenderLayerBacking::computeParentGraphicsLayerRect() is doing:

        ShouldRespectOverflowClip shouldRespectOverflowClip = compositedAncestor->isolatesCompositedBlending() ? RespectOverflowClip : IgnoreOverflowClip;
        RenderLayer::ClipRectsContext clipRectsContext(compositedAncestor, TemporaryClipRects, IgnoreOverlayScrollbarSize, shouldRespectOverflowClip);
        LayoutRect parentClipRect = m_owningLayer.backgroundClipRect(clipRectsContext).rect(); // FIXME: Incorrect for CSS regions.

so 'shouldRespectOverflowClip' differs.

[Simon Fraser (smfr)]

That code came from https://trac.webkit.org/changeset/168314/webkit

[Simon Fraser (smfr)]

*** This bug has been marked as a duplicate of bug 197695 ***