[Webkit-unassigned] [Bug 48297] Fix LayoutTests/canvas/philip/tests/2d.composite.uncovered.image.destination-atop.html

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=48297


James Robinson <jamesr at chromium.org> changed:

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--- Comment #21 from James Robinson <jamesr at chromium.org>  2011-07-22 15:42:26 PST ---
(From update of attachment 100262)
This will produce weird results if the destination rectangle is not pixel-aligned.  I think in general the displayTransparencyElsewhere() approach is not going to work perfectly.

I think we should investigate using an intermediate surface for these composite operations and see what the performance looks like.  This is what firefox does and is closer to the rendering model in the spec.  If it's not too expensive, it'll be a lot simpler and correct in all of these tricky cases.

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