[Webkit-unassigned] [Bug 70103] [chromium] Implement position:fixed in compositor thread

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70103





--- Comment #2 from Vangelis Kokkevis <vangelis at chromium.org>  2011-10-14 10:00:46 PST ---
(From update of attachment 111002)
View in context: https://bugs.webkit.org/attachment.cgi?id=111002&action=review

> Source/WebCore/platform/graphics/chromium/cc/CCLayerTreeHostCommon.cpp:136
> +

I generally expect that fixed position layers will be the exception rather than the rule. In addition scroll deltas will only happen when running on the thread. I would prefer to pay the penalty of adjusting the transform only when really necessary.  In other words, as we descend the layer hierarchy, if we find a fixed position layer then walk upwards until the enclosing scrolling parent and compute the transform delta.

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