private static ColorF MaseyaBlend(ColorF x, ColorF y)
{
// Ensure at least a 2.5% change in hue.
var hue = (y.Red * 0.95f) + 0.025f + x.Hue;
var chromaShift = y.Green - 0.5f;
var chroma = x.Chroma;
if (chromaShift > 0)
{
// Put heavy limitations on oversaturating colors.
chroma *= 1.0f + ((1.0f - chroma) * chromaShift * 0.5f);
}
else
{
// Put no limitation on desaturating colors. However, make it
// more likely that only a little desaturation will occur.
chroma *= (float)Pow(1 - Pow(chromaShift * 2, 2), 0.5);
}
var lumaShift = y.Blue - 0.5f;
var luma = x.Luma;
if (lumaShift > 0)
{
// Do not heavily brighten colors. However, if we removed a
// lot of saturation, then we can allow for some brighter
// colors.
var chromaDiff = Max(x.Chroma - chroma, 0);
luma *= 1.0f + ((1.0f - x.Luma) * lumaShift * (1.0f + chromaDiff));
}
else
{
// Do not let colors get too dark.
luma *= 1.0f + (lumaShift / 2.0f);
}
var result = ColorF.FromHcy(
hue,
chroma,
luma);
return(result);
}
