fix: use 16-bit midpoint for monochrome CopyBits - #570
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Fixes #569.
The 8-bit indexed-to-1-bit
CopyBitspath now compares RGB luminance against the midpoint of Macintosh RGBColor’s 16-bit component range. Regression coverage exercises black, white, and values immediately below and at the midpoint.Validation:
cargo fmt --checkCARGO_INCREMENTAL=0 cargo test --lib(2950 passed, 3 ignored)