The ideal is an bare bones equivalent of an OpenGL pixel shader, ie.

- A function is executed for every output pixel.
- This function has a sampler available to bring in arbitrary pixels from 
sources
- This function can do some basic RGB maths

(and, props for getting this far!)

Toby

tbz::spk // mobile mail

On 14 May 2013, at 17:47, Sébastien Bourdeauducq 
<sebastien.bourdeaud...@lekernel.net> wrote:

> Mikael Wehner from vjunion.se mentioned different common blend modes
> for the video mixer - making them an arbitrary function of the input
> pixels sounds like an interesting feature, and one that is fun to
> develop :-)
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