public static Color Blend(this Color current, Color target, ColorBlend mode, float amount = 1)
{
var white = Color.white;
var value = Color.cyan;
Func <float, float, float> formula = null;
if (mode.Matches("Balance"))
{
value = current;
var luma = current.GetLuminance();
var otherLuma = target.GetLuminance();
var difference = (luma - otherLuma).Abs();
if (difference <= 0.3f)
{
value = current.Add(luma < 0.3f ? 0.5f : -0.5f);
}
}
else if (mode.Matches("Darken"))
{
value = current.Min(target);
}
else if (mode.Matches("Multiply"))
{
value = current * target;
}
else if (mode.Matches("ColorBurn"))
{
var blend = current.Invert().Divide(target);
value = blend.Invert();
}
else if (mode.Matches("LinearBurn"))
{
value = current + target - white;
}
else if (mode.Matches("DarkerColor"))
{
}
else if (mode.Matches("Lighten"))
{
value = current.Max(target);
}
else if (mode.Matches("Screen"))
{
value = white - current.Invert() * target.Invert();
}
else if (mode.Matches("ColorDodge"))
{
value = current.Divide(target.Invert());
}
else if (mode.Matches("Add") || mode.Matches("LinearDodge"))
{
value = current + target;
}
else if (mode.Matches("LighterColor"))
{
}
else if (mode.Matches("Overlay"))
{
formula = (a, b) => { return(a < 0.5f ? 2 * a * b : 1 - (2 * (1 - a) * (1 - b))); };
}
else if (mode.Matches("SoftLight"))
{
formula = (a, b) => { return(b < 0.5f ? 2 * a * b + a + a * (1 - 2 * b) : Math.Sqrt(a).ToFloat() * (2 * b - 1) + 2 * a * (1 - b)); };
}
else if (mode.Matches("HardLight"))
{
}
else if (mode.MatchesAny("VividLight", "LinearLight", "PinLight"))
{
ColorBlend modeA = ColorBlend.ColorBurn;
ColorBlend modeB = ColorBlend.ColorDodge;
if (mode.Matches("LinearLight"))
{
modeA = ColorBlend.LinearBurn;
modeB = ColorBlend.LinearDodge;
}
if (mode.Matches("PinLight"))
{
modeA = ColorBlend.Darken;
modeB = ColorBlend.Lighten;
}
var blendA = current.Blend(2 * target, modeA);
var blendB = current.Blend(2 * (target - (white * 0.5f)), modeB);
value.r = target.r < 0.5f ? blendA.r : blendB.r;
value.g = target.g < 0.5f ? blendA.g : blendB.g;
value.b = target.b < 0.5f ? blendA.b : blendB.b;
}
else if (mode.Matches("HardMix"))
{
var blend = current.Blend(target, ColorBlend.VividLight);
value.r = blend.r < 0.5f ? 0 : 1;
value.g = blend.g < 0.5f ? 0 : 1;
value.b = blend.b < 0.5f ? 0 : 1;
}
else if (mode.Matches("Difference"))
{
value = (current - target).Abs();
}
else if (mode.Matches("Exclusion"))
{
value = (current + target - 2.0f * current * target);
}
else if (mode.Matches("Subtract"))
{
value = target - current;
}
else if (mode.Matches("Divide"))
{
value = target.Divide(current);
}
else if (mode.Matches("Hue"))
{
}
else if (mode.Matches("Saturation"))
{
}
else if (mode.Matches("Color"))
{
}
else if (mode.Matches("Luminosity"))
{
}
if (!formula.IsNull())
{
value.r = formula(current.r, target.r);
value.g = formula(current.g, target.g);
value.b = formula(current.b, target.b);
}
return(current.Lerp(value.Saturate(), amount));
}
