Re: [Gegl-developer] Compositors

[Ville Sokk <ville sokk gmail com>]

On Sat, Jul 7, 2012 at 9:24 PM, Calculemus <calculemus1988 gmail com> wrote:
> 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?
>
> Thanks
>
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Just above the process function you can see the prepare function which
sets input, aux and output buffers to RaGaBaA which is RGBA with
premultiplied alpha.