[Webkit-unassigned] [Bug 151030] ASSERTION FAILED: roundedIntPoint(LayoutPoint(rendererMappedResult)) == result in WebCore::RenderGeometryMap::mapToContainer

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Feb 17 17:27:50 PST 2020


https://bugs.webkit.org/show_bug.cgi?id=151030

Jack <shihchieh_lee at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |shihchieh_lee at apple.com

--- Comment #8 from Jack <shihchieh_lee at apple.com> ---
Root cause of descrepency when m_accumulatedOffset is saturated:
In pushMappingsToAncestor, the offset of each layer is accumulated and stored in m_accumulatedOffset, and clamped by saturated value: 0x7FFFFFFF. On the other hand, in popMappingsToAncestor, offset of each layer is substracted from m_accumulatedOffset. However, when m_accumulatedOffset is saturated the substraction does not set m_accumulatedOffset back to the original offset of each layer, resulting in the assertion.

Verified root cause by workaround: Keep a snapshot of m_accumulatedOffset at each call to pushMappingsToAncestor, and restore the offset from the snapshot when popMappingsToAncestor is called.

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