| Re: [AD] set_difference_blender patch |
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On 2011-01-30, Jon Rafkind <workmin@xxxxxxxxxx> wrote:
> Anyone mind if I apply this patch to set_difference_blender for 4.4? It
> clamps the lowest value to 0 instead of using ABS to wrap around. Heres
> a post on a.cc that no one responded to:
> http://www.allegro.cc/forums/thread/606235
>
> I can add an example program if someone wants.
The relevant change log entry is:
+ 3.9.17: Burton Radons changed the truecolor pixel blending functions to
+ use a single callback function rather than the previous table. This may
+ break some old code, but should remain largely backward compatible, and
+ the new way is much more flexible. He also added a more complete set of
+ blender functions, including Photoshop modes like burn, difference,
+ lumincance, etc.
I don't have Photoshop, but if GIMP implements the same thing then your
patch would appear to be correct.
Peter