extract pixel format strategies and data-driven driver registry - #6
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- add formats.js: one strategy class per color mode (mono, 4gray, 3color,
7color) owning bit packing, clear values, transparency background and
RGB quantization
- EPDBase delegates setPixel/clear/rgbToColor/transparency to the active
format, replacing ~180 lines of per-mode if/else chains; color buffer
allocation driven by the format's usesColorBuffer flag
- fold EPD7in3f's setPixel override (clamping) into SevenColorFormat
- each driver exports meta + create; displays/index.js builds the factory
lookup and getSupportedModels() from that registry, replacing the
hand-maintained switch (getSupportedModels entries now include aliases)
- pin format bit-packing and registry behavior with 6 new tests (29 total)
- bump version to 0.4.0
Behavior is unchanged: all pixel/RGB logic was moved verbatim and the
byte-stream tests pass untouched.
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Behavior is unchanged: all pixel/RGB logic was moved verbatim and the
byte-stream tests pass untouched.