RGB_FRAC 127 gd/libgd/webpimg.c enum { RGB_FRAC = 16, RGB_HALF = (1 << RGB_FRAC) / 2, RGB_FRAC 127 gd/libgd/webpimg.c enum { RGB_FRAC = 16, RGB_HALF = (1 << RGB_FRAC) / 2,