[Webkit-unassigned] [Bug 49135] Optimize painting to avoid rendering areas that are completely obscured by other elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=49135





--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com>  2010-11-06 17:16:54 PST ---
Created an attachment (id=73180)
 --> (https://bugs.webkit.org/attachment.cgi?id=73180&action=review)
WIP patch

This is a demonstration of how the optimization might work. If I tweak the test a little (make the iframe positioned), this makes some Peacekeeper tests 2-26% faster.

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