Add clipped sprite rotation #621
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…and adjusted the stack frame
…-pointer rotation offsets
… sprite routines. Also updated the apng for sprites_rotate_scale
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Adds
gfx_RotatedScaledSpriteandgfx_RotatedScaledTransparentSpritealong with a demo undertoolchain/examples/library_examples/sprites_rotate_clipped:These functions return the size of the sprite before clipping is performed.
The performance of the clipped routines is identical to the unclipped routines apart from a small constant overhead to calculate the clipped region.