[Webkit-unassigned] [Bug 25417] Skia CompositeCopy should be mapped to kSrc_Mode not kSrcOver_Mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=25417





------- Comment #27 from oliver at apple.com  2009-05-20 22:49 PDT -------
One major concern i have is that this behavoiur (while correct) actually means
that skia's transparency model is different from that expected by WebKit.

The blend modes should only effect the region being drawn to, yet currently
skia has followed the cairo model and as rendering a number of modes as if it
were drawing a clipregion sized piece of content, with 0 alpha outside the
region that is being drawn to.

I'm hoping to fix the canvas implementation to do the right thing soon, but i
am concerned that there may be cases (especially in svg) where skia and cairo
end up doing the wrong thing.

--Oliver


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