On second look I think the simplification Larry suggested won't work. There are X number of Porter-Duff operations and Y number of blend modes. If I am doing such simplifications, I will have to do it for each pair (Porter-Duff operation, blend mode), and that would be X = 12, Y = 20, X*Y=240 functions.
A Porter-Duff operation/function will take a function pointer to a blend mode function. That way I will get the combination like in the formula we talked about. But I am afraid, without much math simplification.
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