[Webkit-unassigned] [Bug 21575] Cairo's ImageBuffer::getImageData() does not handle alpha=0 case correctly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=21575





------- Comment #4 from vbs85 at gmx.de  2008-10-29 03:25 PDT -------
Created an attachment (id=24743)
 --> (https://bugs.webkit.org/attachment.cgi?id=24743&action=view)
canvas-getImageData.html output

This is the output of canvas-getImageData.html after applying the patch. Like
you can see many tests fail, because alpha channel is 1 "degree" lower than it
should be. And perhaps thats why the other colors are wrong too. Because we use
the alpha to get premultiplied colors.


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