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Seth Hillbrand 6c749a4e84 Fix gerbview XOR mode
XOR mode was using additive blending instead of abs diff.

This fix implements proper difference mode that computes |src - dst|
for each color channel
2026-01-01 07:48:03 -08:00
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2026-01-01 07:48:03 -08:00
2026-01-01 07:48:03 -08:00