+static unsigned char image_linearfromsrgb[256];
+
+void Image_MakeLinearColorsFromsRGB(unsigned char *pout, const unsigned char *pin, int numpixels)
+{
+ int i;
+ // this math from http://www.opengl.org/registry/specs/EXT/texture_sRGB.txt
+ if (!image_linearfromsrgb[255])
+ for (i = 0;i < 256;i++)
+ image_linearfromsrgb[i] = i < 11 ? (int)(i / 12.92f) : (int)(pow((i/256.0f + 0.055f)/1.0555f, 2.4)*256.0f);
+ for (i = 0;i < numpixels;i++)
+ {
+ pout[i*4+0] = image_linearfromsrgb[pin[i*4+0]];
+ pout[i*4+1] = image_linearfromsrgb[pin[i*4+1]];
+ pout[i*4+2] = image_linearfromsrgb[pin[i*4+2]];
+ pout[i*4+3] = pin[i*4+3];
+ }
+}
+