public void PremulAlphaTest() { Assert.That(Color4.PremulAlpha(Color4.White), Is.EqualTo(Color4.White)); Assert.That(Color4.PremulAlpha(Color4.Black), Is.EqualTo(Color4.Black)); var halfTransparentWhite = Color4.White; halfTransparentWhite.A = 128; var halfTransparentGray = Color4.Gray; halfTransparentGray.A = 128; Assert.That(Color4.PremulAlpha(halfTransparentWhite), Is.EqualTo(halfTransparentGray)); }