Low level graphics is rough. The pixman library is really nice in that it is heavily SIMD optimized (for multiple architectures and instruction sets). It also has routines that are less commonly used in modern graphics (dithering).
But it's also kind of terrible in that there is no formal documentation. The official website says you should just look at the source. But at least there are quite a few official examples.
https://pixman.org/
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