[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





--- Comment #44 from Darin Adler <darin at apple.com>  2010-01-22 16:47:47 PST ---
The relevant code here is the function platformSetCanBlitOnScroll, called from
ScrollView::setCanBlitOnScroll. This should have been the clue that there was
some issue on at least one platform.

Once that’s called with the value set to true, on the Mac, WebKit has told
AppKit it can scroll by blitting without even calling through to WebCore.

Generally speaking, we can't easily change the ScrollView-level
setCanBlitOnScroll function to mean some sort of smarter blitting and retain
the current behavior on Mac OS X, so maybe we should have a separate bit to
reflect this new intermediate state.

Some sort of ifdef solution might be OK. Or some kind of runtime solution.

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