public void add(Color color) {
			int ca = color.getAlpha();
			a += ca;
			r += ca * color.getRed();
			g += ca * color.getGreen();
			b += ca * color.getBlue();
		}
Add a color into the mixture, in a quantity proportional to its alpha value

@param color the color to mix
Ghidra/Framework/Gui/src/main/java/ghidra/util/ColorUtils.java