>> OOC, is it possible to use a GPU to copy and transform chunks of video 
>> data? (E.g., rotate, scale, that kind of thing.)
> 
> Yes, you just draw a textured square wherever you want, using whatever 
> you want as the texture (the result of a previous calculation?).

I was hoping you'd say something like that. :-)

Is it possible to take a chunk of the frame buffer and turn it into a 
texture? Or would I have to render texture to texture and then make a 
copy to the screen so I can see it?

> The only limitation is that you cannot render to a texture at the same 
> time as using that texture as a source for drawing operations.

That won't be a problem.

-- 
http://blog.orphi.me.uk/
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