How are you getting the image in the first place? Couldn't you just use
multiple gl_getbox()es, and then you'd have the exact image that you
needed?

Alternately, you could paste it to gl's framebuffer, and then use
gl_copyboxfromcontext() to extract the appropriate part.

I'm sure Russell & Sergio will have better answers, but this might get you
started.  :-)


-Jay

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