[c++] Converting from signed char to unsigned char and back again?

Do you realize, that CLAMP255 returns 0 for v < 0 and 255 for v >= 0?
IMHO, CLAMP255 should be defined as:

#define CLAMP255(v) (v > 255 ? 255 : (v < 0 ? 0 : v))

Difference: If v is not greater than 255 and not less than 0: return v instead of 255

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