https://gitlab.synchro.net/main/sbbs/-/commit/e2bbb4d5396ec9d598edea5c
Modified Files:
src/conio/scale.c xbr.c
Log Message:
Use the YCoCg-R colour space instead of YCbCr.

It seems to provide similar perceptual results, and is much faster
to transform with RGB. It's still slower than the table lookup,
but not crushingly so.

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https://gitlab.synchro.net/main/sbbs/-/commit/58f9d4750803538cc29a9af1
Modified Files:
src/conio/scale.c xbr.c
Log Message:
More scaling cleanup... no undefined behaviour

Remove undefined behaviour (right-shifting a negative integer) from
the scaler... replace with divide-by-2. Any modern compiler should
be able to optimize that.

On the enabling the compiler front, const-ify more variables and
use types that allow removing some casts.

I have a bit more hope this will fix the macOS issue than the previous
efforts.

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