First released (in this form) on: 25-dec-2005
'Rotozoomer' is an old demoscene effect. It was first invented by Chaos / Sanity on the Amiga 500 in 1989. I programmed my first rotozoomer in 1990 also on the Amiga 500 in MC68000 assembler for our Somewhere In Holland 1 democompetition winner 'Internal Exile' (for Perseus). Video of that demo can be found here: https://www.youtube.com/watch?v=riIIidPtuFE. If you want to run it on your own Amiga or WinUAE on PC, go here: http://www.pouet.net/prod.php?which=12439
Because this implementation can eat any size of image and also can render to any size of canvas, the clamping per pixel is rather slow (modulo's) instead of bit-voodoo. If you use a render canvas size which is of power of 2 and the image is also of a size of power of 2, you can clamp using bit operations, which is much faster, but hey, it's the idea that counts ;)
To get that demoscene feeling, I've included one of my fake-drawings I made for one of the pixel competitions years and years ago. 10 points for the first person who recognizes the original person :). The picture included is from 2001 and is called 'Fur'.
Have fun!