[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 #37 from Dana Jansens <danakj at chromium.org>  2011-11-04 10:14:44 PST ---
The last patch addresses the smaller things you've brought up, hopefully sufficiently, as well as considers the full union of opaque rects when deciding if the opaque flag should be set or not.

Using the painting tree walk would be problematic, I believe, since properties change between paints, and we would like to know the opaque state during the painting process to limit painting as well as blitting to the screen.

However, the layout tree walk was suggested as a place for this computation.  I will look into using the RenderObject walk there.

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