Jonas Diemer 0165fab581 Fix BMP rendering gamma/brightness (#302) ...

1. Refactor Bitmap.cpp/h to expose the options for FloydSteinberg and
brightness/gamma correction at runtime
2. Fine-tune the thresholds for Floyd Steiberg and simple quantization
to better match the display's colors

Turns out that 2 is enough to make the images render properly, so the
brightness boost and gamma adjustment doesn't seem necessary currently
(at least for my test image).

2026-01-12 22:36:19 +11:00

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