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Remove SDL_CalculateGammaRamp.

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slime
2022-11-25 16:57:07 -04:00
committed by Sam Lantinga
parent 52f4cc843d
commit ac8fbb7040
6 changed files with 5 additions and 160 deletions
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40
src/video/SDL_pixels.c
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@@ -1150,44 +1150,4 @@ SDL_FreeBlitMap(SDL_BlitMap * map)
}
}
void
SDL_CalculateGammaRamp(float gamma, Uint16 * ramp)
{
int i;
/* Input validation */
if (gamma < 0.0f ) {
SDL_InvalidParamError("gamma");
return;
}
if (ramp == NULL) {
SDL_InvalidParamError("ramp");
return;
}
/* 0.0 gamma is all black */
if (gamma == 0.0f) {
SDL_memset(ramp, 0, 256 * sizeof(Uint16));
return;
} else if (gamma == 1.0f) {
/* 1.0 gamma is identity */
for (i = 0; i < 256; ++i) {
ramp[i] = (i << 8) | i;
}
return;
} else {
/* Calculate a real gamma ramp */
int value;
gamma = 1.0f / gamma;
for (i = 0; i < 256; ++i) {
value =
(int) (SDL_pow((double) i / 256.0, gamma) * 65535.0 + 0.5);
if (value > 65535) {
value = 65535;
}
ramp[i] = (Uint16) value;
}
}
}
/* vi: set ts=4 sw=4 expandtab: */