RGB2              355 ext/gd/libgd/gd.c 	RGBType RGB1, RGB2;
RGB2              360 ext/gd/libgd/gd.c 	SETUP_RGB(RGB2, r2, g2, b2);
RGB2              363 ext/gd/libgd/gd.c 	RGB_to_HWB(RGB2, &HWB2);