[FFmpeg-devel] [PATCH] vf_overlay: add support to RGBA packed input and output

[Nicolas George]

Le nonidi 9 brumaire, an CCXX, Stefano Sabatini a écrit :
>			 and I suppose that most decent compilers
> will know all about these numerical tricks,

We had the very same problem in MPlayer last year, and it turned out that
they do not, or at least at that time they did not.

I believe Michael's explanation is the correct one: this trick only works
for a particular range of values, which is exactly what is needed for alpha
blending, but way to specific to be in the compiler.

Regards,

-- 
  Nicolas George
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