Lilith River 29e43d2314 fix: handle WhiteIsZero for extended bit depths, add comprehensive tests ...

Fix invert_colors to support extended bit depths (9-15 promoted to u16,
17-31 promoted to u32). Byte-wise NOT doesn't work for promoted samples
because it flips unused upper bits; use (max - value) instead.

Add regression tests covering the extended depth matrix:
- Gray 10/14/24-bit (contiguous, BlackIsZero)
- RGB 10/14/24-bit (contiguous)
- RGB 10/12/14/24-bit (planar)
- Gray 12-bit with WhiteIsZero (synthetic 4x2 image)
- Gray 12-bit with horizontal predictor (synthetic 4x2 image)

2026-03-10 06:02:19 -06:00

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