[Webkit-unassigned] [Bug 48291] Fix LayoutTests/canvas/philip/tests/2d.composite.uncovered.fill.copy.html

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=48291


Mustafizur Rahaman <mustaf.here at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |kling at webkit.org




--- Comment #28 from Mustafizur Rahaman <mustaf.here at gmail.com>  2011-06-15 13:49:00 PST ---
(In reply to comment #26)
> (From update of attachment 97332 [details])
> this looks sensible in the context of what's currently going on in the canvas, but has anyone actually been verifying that we haven't been getting any performance regressions from these changes?  This especially important for "copy" as it's a reasonably common compositing mode (vs. atop, etc).  Have we also verified that this behaviour matches other browsers?

Regarding your comment ("I suspect that at the moment we're taking a huge hit if you do a copy into the canvas that fills the entire canvas") during our discussion on IRC, I did some further debugging & found that if my copy is filling entire canvas, i am not clearing out unnecessarily. So, as per my observation, we are only clearing that area which we are not going to fill by our copy operation.

Can mdelaney/kling please comment here?

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