Graphics rotation
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Rotation algorithm that uses matrix shearing. https://www.ocf.berkeley.edu/~fricke/projects/israel/paeth/rotation_by_shearing.html
It can rotate the graphics page by any arbitrary angle, but you're limited on how large a rectangle you can rotate without losing some corners because they're cut off by the GRP's 512x512 boundary. 400x400 was the biggest I've tested, but I don't feel like doing the math to figure out the actual largest size.
It's the 100% fastest dang thing possible.