This fixes an 11-year-old bug in the rgb2xyz functions, when used with a
negative stride. The current loop bounds turned it into a no-op.
Additionally, this increases performance on highly cropped images, whose
stride may be substantially higher than the effective width.
Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <git@haasn.dev>
Niklas Haas
9d8f5141cf