NEW 120816
Filters buffers should track whether there is any non-1 alpha, and avoid operations on the alpha channel if necessary 
https://bugs.webkit.org/show_bug.cgi?id=120816
Summary Filters buffers should track whether there is any non-1 alpha, and avoid oper...
Simon Fraser (smfr)
Reported 2013-09-05 17:30:33 PDT
Filters like blur do work on the alpha channel bytes, but in many cases the alpha channel is going to be all 255, and we could avoid doing any math on it (e.g. no point blurring all-255 alpha).
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