One of the best pages describing image rotation algorithms I’ve found on the internet is tied to Dan Bloomberg’s excellent leptonica library. While the leptonica library itself is written in C and won’t help you, his page on image rotation algorithms:
http://www.leptonica.org/rotation.html
is definitely worth a read. You will most likely want to implement something like the Rotation by Area Mapping algorithm he describes in the second portion of the page.
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