[cairo] Blend modes take 3

Behdad Esfahbod behdad at behdad.org
Wed Oct 8 18:21:32 PDT 2008

Jeff Muizelaar wrote:
> On Wed, Oct 08, 2008 at 11:44:01AM +0200, Benjamin Otte wrote:
>> Hey,
>> After Emmanuel's [1] and my [2] previous attempt, I've started the
>> third attempt to get SVG and Flash blend modes into Cairo. And this
>> time I'm dead serious. I intend to merge my current work once 1.9
>> opens unless there's any objections.
>> I've published git repositories containing my work [3]. I regularly
>> rebase them on top of current master. The code is complete, I just
>> need to cleanup the commit order at some point.
> There should probably be documentation in cairo, like the pixman
> documentation, about the definition of each of the new operators.

There's some good docs at http://cairographics.org/operators

Merging that in or some other ways to get it in the reference manual is much


> It would also be good to compare the definition of each operator with
> the quartz blend modes to ensure they are the same:
> http://developer.apple.com/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_images/chapter_12_section_7.html
> -Jeff

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