> 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?).

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.

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