int transparentcolor;
unsigned char *colormap;
fs_offset_t filesize;
+ union
+ {
+ int i;
+ unsigned char b[4];
+ }
+ u;
colormap = FS_LoadFile("gfx/colormap.lmp", tempmempool, true, &filesize);
if (colormap && filesize >= 16385)
for (i = 0;i < 256;i++)
palette_bgra_alpha[i] = 0xFFFFFFFF;
- palette_bgra_alpha[transparentcolor] = 0;
+ u.i = 0xFFFFFFFF;
+ u.b[3] = 0;
+ palette_bgra_alpha[transparentcolor] = u.i;
for (i = 0;i < 256;i++)
palette_bgra_font[i] = palette_bgra_complete[i];
palette_bgra_font[0] = 0;
}
-void BuildGammaTable8(float prescale, float gamma, float scale, float base, unsigned char *out, int rampsize)
+void BuildGammaTable8(float prescale, float gamma, float scale, float base, float contrastboost, unsigned char *out, int rampsize)
{
int i, adjusted;
double invgamma;
+ double t, d;
invgamma = 1.0 / gamma;
prescale /= (double) (rampsize - 1);
for (i = 0;i < rampsize;i++)
{
- adjusted = (int) (255.0 * (pow((double) i * prescale, invgamma) * scale + base) + 0.5);
+ t = i * prescale;
+ d = ((contrastboost - 1) * t + 1);
+ if(d == 0)
+ t = 0; // we could just as well assume 1 here, depending on which side of the division by zero we want to be
+ else
+ t = contrastboost * t / d;
+ adjusted = (int) (255.0 * (pow(t, invgamma) * scale + base) + 0.5);
out[i] = bound(0, adjusted, 255);
}
}
-void BuildGammaTable16(float prescale, float gamma, float scale, float base, unsigned short *out, int rampsize)
+void BuildGammaTable16(float prescale, float gamma, float scale, float base, float contrastboost, unsigned short *out, int rampsize)
{
int i, adjusted;
double invgamma;
+ double t;
invgamma = 1.0 / gamma;
prescale /= (double) (rampsize - 1);
for (i = 0;i < rampsize;i++)
{
- adjusted = (int) (65535.0 * (pow((double) i * prescale, invgamma) * scale + base) + 0.5);
+ t = i * prescale;
+ t = contrastboost * t / ((contrastboost - 1) * t + 1);
+ adjusted = (int) (65535.0 * (pow(t, invgamma) * scale + base) + 0.5);
out[i] = bound(0, adjusted, 65535);
}
}
scale = bound(0.01, scale, 10.0);
base = bound(0, base, 0.95);
- BuildGammaTable8(1.0f, gamma, scale, base, texturegammaramp, 256);
+ BuildGammaTable8(1.0f, gamma, scale, base, 1, texturegammaramp, 256);
palfile = (unsigned char *)FS_LoadFile ("gfx/palette.lmp", tempmempool, false, &filesize);
if (palfile && filesize >= 768)