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Upsampling image

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Ah, whatdayaknow. I finally found it in his libraries here:

http://astronomy.swin.edu.au/~pbourke/libraries/

Problem solved.

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Well, it seems to work ok, but that 4x4 inner loop it uses is *extremely* slow.
It does a good job of killing the speed.
Have to look for something faster because I want to sample images up to 4096 x 4096.

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The only thing I can think of (don't even sure if it can be done in your case) is to replace the loop with the actual 16 instructions. If this function is called very often (as it should be, if I understood correctly), you should be able to gain a little speed, but I don't know how much. It worth give a try, I think...

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