[-] Quaternions
[X] Draw rotated pixels in src order
[X] Use atan2 at beginning and end of line.
    Interpolation in-between values
[X] Test pixel perfect 90
[ ] Fix out-of-bounds pixel set

[ ] Optimization for square images?
[ ] Fixed point computation?

# Cache
[-] Rotate per channel -> no gain
[ ] Load pixels in uint64-t
[X] Cut image in tiles
 [ ] Overlap?
 [ ] Rotate in one temp tile then copy/move it
[-] Align memory -> no gain

# Quality
[X] Interpolate using SIMD, SSE (no big gain)
[ ] Image borders

# Bugs
[ ] first tile on each row is missing