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recently i've been trying to make touchHLE's 2D bitmap drawing code (CGBitmapContext implementation) support arbitrary rotation, scaling, and translation. i'm very nearly done! here's some fun screenshots of what apps looks like with my test code that adds a 0.1 radians rotation
yes i know i should use bilinear texture interpolation so it doesn't look like an early-90's sprite scaler hardware throwback, but i'm lazy
my implementation behaves like a scanline rasteriser while being nowhere near as efficient as a scanline rasteriser :p