[Webkit-unassigned] [Bug 77369] Introduce a no-repaint-expected flag

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=77369





--- Comment #3 from Julien Chaffraix <jchaffraix at webkit.org>  2012-01-30 15:24:03 PST ---
> Could you define your terms more precisely? What exactly do you mean by over-repainting? Too many invalidations sent out, invalidation rects that are too large, too much time calculating repaint rects, something else ... ?

Good point, I should have said needless invalidations. With the accelerated composition, it appears that some of our invalidation could now be removed.

> I don't really understand what you're trying to achieve. We generally consider repaints as cheap, as long as they get coalesced into a single paint.

I guess that stemmed from my bad wording of the problem: the invalidation are cheap indeed, painting may not be. It's always better to avoid repainting at all if we can avoid it.

Note that I haven't investigated how difficult it would be to add the flag, just that it would be a nice addition.

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