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Fix rounding in MULT_DIV_255

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Brick
2024-07-03 14:36:50 +01:00
committed by Sam Lantinga
parent b7b513b70b
commit 5d875aa94e
1 changed files with 1 additions and 0 deletions
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src/video/SDL_blit.h
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@@ -513,6 +513,7 @@ extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface);
#define MULT_DIV_255(sC, dC, out) \ #define MULT_DIV_255(sC, dC, out) \
do { \ do { \
Uint16 x = sC * dC; \ Uint16 x = sC * dC; \
x += 0x1U; \
x += x >> 8; \ x += x >> 8; \
out = x >> 8; \ out = x >> 8; \
} while (0) } while (0)