> I am trying to copy a quadrangular but NOT rectangular area of
> one image to
> THE SAME quadrangular area of another image of the same size.

How about creating an image object, filling it with black, copyPixelling it
to another image object using the quad you need then using this image as a
mask in copying from one to the other. Most of this is done in RAM so it
should be relatively fast, though I'm sure there are some optimisations
available.

HTH,
-Sean.

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