[Webkit-unassigned] [Bug 15266] Canvas shadows on gradients and patterns don't work sensibly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=15266


Mihai Parparita <mihaip at chromium.org> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |NEW
                 CC|                            |mihaip at chromium.org
     Ever Confirmed|0                           |1




--- Comment #9 from Mihai Parparita <mihaip at chromium.org>  2010-12-10 17:53:34 PST ---
I briefly investigated this. It looks like the problem is that the GraphicsContext::fillRect implementation in GraphicsContextCG.cpp ignores shadows altogether for the case where there's a gradient. It ends up clipping to the rect to the filled and calling Gradient::Paint (as implemented in GradientCG.cpp). That just uses CGContextDrawLinearGradient, which doesn't use the context shadow.

Fixing this probably involves drawing the gradient into a temporary CG context and then drawing it into the canvas one using the codepath that drawImage uses, which uses drop shadows (and does the right thing for alpha).

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