[Webkit-unassigned] [Bug 69091] Background bleed avoidance has performance drawback

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69091





--- Comment #5 from Hin-Chung Lam <hclam at google.com>  2011-10-03 08:21:23 PST ---
(In reply to comment #4)
> Created an attachment (id=109485)
 --> (https://bugs.webkit.org/attachment.cgi?id=109485&action=review) [details]
> Sample test for the performance problem
> 
> Here's a test case for the performance problem.

(In reply to comment #3)
> (In reply to comment #0)
> > To avoid background bleeding for radius border the current best approach is to create a transparent layer to paint background and border, clipping is done at the end. While this works all the time it has performance drawback and on some sites this makes scrolling very slow.
> > 
> 
> Are you talking about the skia antialiased clipping logic, or something in the cross-platform WebKit code?

This is in the cross-platform WebKit code: http://trac.webkit.org/browser/trunk/Source/WebCore/rendering/RenderBox.cpp#L910

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