[Webkit-unassigned] [Bug 45750] Move backing-store contents on slow scrolls

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Oct 12 12:20:52 PDT 2010


https://bugs.webkit.org/show_bug.cgi?id=45750


Dave Hyatt <hyatt at apple.com> changed:

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--- Comment #17 from Dave Hyatt <hyatt at apple.com>  2010-10-12 12:20:51 PST ---
(From update of attachment 69382)
We discussed this some on IRC, but basically if the slow scroll method is called it specifically means that WebCore has detected that it is not safe to just move the pixels.  The test case did actually work still with this patch, and that baffles me (it makes me think there may be some HostWindow mis-implementation leading to a lucky extra repaint).  The fact that you need this change makes me think maybe your canBlitOnScroll state is corrupted or not set up properly.

I'd love to see an actual test case that gets faster with this patch.  That would be really helpful for understanding what problem this patch is trying to solve.

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