I implemented and tested all 12 Porter-Duff operations. It worked out nicely, very little changed in the code we already had for 'over'.
https://github.com/StefanStavrev/oiio/commit/4d59cc94a11ec91faadd97ab94102cfde26714a4 So just to let you know, now I have 22 blend modes and 12 Porter-Duff operations implemented and tested. Stefan
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