[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 #59 from Dana Jansens <danakj at chromium.org>  2011-11-22 11:09:34 PST ---
With composited <img> tags, the backing uses GraphicsLayer::setContentsToImage() rather than the general code-path.  Opaque-ness needs to be tested in the GraphicsLayer subclass.

In order to test opaque RenderImage objects, we need the image to be a child of a composited object.  This patch doesn't consider child RenderObjects so we can't test them just yet.  I've created tests for them in the next-step edition.

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