private Color(int red, int green, int blue, int alpha) {
Assert.isTrue(
red >= 0
&& green >= 0
&& blue >= 0
&& alpha >= 0
&& red <= 255
&& green <= 255
&& blue <= 255
&& alpha <= 255);
this.red = red;
this.green = green;
this.blue = blue;
this.alpha = alpha;
this.argb32 = red + (green << 8) + (blue << 16) + (alpha << 24);
}
