[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 #1 from Hin-Chung Lam <hclam at google.com>  2011-10-14 05:46:02 PST ---
Created an attachment (id=111002)
 --> (https://bugs.webkit.org/attachment.cgi?id=111002&action=review)
Work in progress demo

This is really a work in progress as I'm trying to get familiar with the code. This patch is based on Vangelis's change and added change to CCLayerTreeHostCommon.cpp that implements the idea I described.

The algorithm is pretty simple, as we recursively compute the draw transform, keep a copy with scroll delta translation, then when we hit a layer that doesn't want scrolling then it switches to the unscrolled draw transform. This will keep all the children to have maintain proper transformation.

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