In sprite-based systems, it's common to fake rotation of a sprite by having many different images, each showing it rotated an extra few degrees.
Is there any free tool which will take a single image, and output a single image containing several rotations? It should also ideally let us control how many images are in each row.
e.g if I have a 32x32 sprite and I want it rotated at 10 degree intervals, the tool might generate a 320x32 file or a 160x64 file