[Webkit-unassigned] [Bug 70634] Mark GraphicsLayers as opaque when possible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70634





--- Comment #8 from Dana Jansens <danakj at chromium.org>  2011-10-24 12:43:56 PST ---
Simple logic to make sure no false-positive opaque happens from RenderLayers that don't fill the GraphicsLayer.

There's a FIXME to improve this logic, but the test "do a set of rects fill this rect" is something we can also leverage to decide whether to paint a tile or not (https://bugs.webkit.org/show_bug.cgi?id=70533) so it is a future step to occur in a more general place.

I'll start to look at what some layout tests would look like.

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