I confirmed from other sources that it only makes sense to use over with blend modes, and other Porter-Duff operations should be separate from blend modes. That makes things so much easier now.
Larry, should I write the derivations in the comments for the functions or is it enough to write just the formula as it is, non-reduced? It will clutter the comments a lot if I include the derivations. I think I should keep the comments light and give the basic formula, but of course use the reduced version in the function.
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