[Webkit-unassigned] [Bug 33150] Do not render the full frame when there is some elements with fixed positioning

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=33150


Benjamin Poulain <benjamin.poulain at nokia.com> changed:

           What    |Removed                     |Added
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  Attachment #47957|0                           |1
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  Attachment #47964|                            |review?, commit-queue?
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--- Comment #66 from Benjamin Poulain <benjamin.poulain at nokia.com>  2010-02-02 12:20:43 PST ---
Created an attachment (id=47964)
 --> (https://bugs.webkit.org/attachment.cgi?id=47964)
Repaint only the invalidated area after scrolling

Update the patch after discussions with Dave Hyatt on IRC.

As a side note: m_fixedObjectCount is only used for disabling blitting on Mac.
The platforms using FrameView always go to scrollContentsFastPath() and figure
if the number of fixed rects is higher than the threshold. I guess I could
cache the result of this computation until the render tree is invalidated, but
I don't think this computation is an issue in front of the time spent in
rendering.

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