[Webkit-unassigned] [Bug 78175] [Chromium] Layout Test compositing/overflow/overflow-scaled-descendant-overlapping.html is failing

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Feb 9 15:14:35 PST 2012


--- Comment #3 from Adrienne Walker <enne at google.com>  2012-02-09 15:14:34 PST ---
(In reply to comment #2)

> I think this current situation kind of sucks.  Suggestions?

Maybe we just need to improve the backgroundCoversViewport to not cover anything else up.

We have tracking for layers and opaqueness.  We could keep a viewport-sized region, subtract everything we know is opaque from it during the culling phase, then draw background-colored rects into the default render surface for everything that we know isn't going to be covered by something else before any other content.  It'd mean that we'd draw an extra rect under our non-opaque scrollbars, but I think it'd address all the use cases we're looking for.

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