Ichthyostega 8fe50e37a4 XV-Display: reorganise image-generator code ...

This is a first step towards the ability to produce several different output formats...

Refactor the code to separate
 - the double buffering
 - the actual image generation, which works in RGB
 - the conversion routine

Furthermore, replace unsigned char by std::byte
and introduce std::array and structured binding
to avoid many usages of pointers; hopefully this
makes the intention of the code clearer.

Verified and cross-checked the actual converion logic;
in fact this is a conversion to "YUV" as used by MPEG,
which in more precise terms is Y'CrCb with Rec.601 colour space
and a scan range limitation (16...235) on the Luma component.

2025-05-11 01:18:19 +02:00

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