[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 #47 from Dana Jansens <danakj at chromium.org>  2011-11-14 09:13:25 PST ---
(In reply to comment #45)
> Can you use platform/graphics/Region.h instead for this?

Yes, that looks like a very appropriate place for such things.


So here is the simpler version of the patch.  Considers a single RenderObject per RenderLayer in a backing.  The backing is considered opaque iff any single such RenderObject fills the entire backing and is opaque.

The *AreOpaqueInRect() functions are rewritten as requested.

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