[Gegl-developer] Compositors

I am trying to understand the code for the compositor soft-light,
in the file /gegl-0.2.0/operations/generated/soft-light.c.

I am not sure about line 25: aD = aA + aB - aA * aB;

What is aD, is it alpha channel? Does gegl assume that the
input image buffers are RGBA?


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