red_mask
red_div = 256 / (cm.red_mask + 1);
red_mul = 256 / (cm.red_mask + 1);
cm->red_mask = 0x0F;
cm->red_mask = 0x0FF;
if (cm->red_mask != vcm->red_mask ||
cm->red_mask = vcm->red_mask;
cm->red_mask = cm->green_mask = cm->blue_mask = 0x3f;
cm->red_mask = cm->green_mask = cm->blue_mask = 0xf;
cm->red_mask + 1, cm->green_mask + 1, cm->blue_mask + 1);