public int GetNearestColor(Color colorTarget, ColorSpace colorSpace)
{
if (colorTarget.ToArgb() == Colors[0].ToArgb())
{
//. color key.
return(0);
}
ColorDistance[] distances = new ColorDistance[Colors.Length - 1];
for (int i = 0; i < distances.Length; i++)
{
distances[i] = new ColorDistance(i + 1, Colors[i + 1], colorSpace.Distance(Colors[i + 1], colorTarget));
}
for (int i = 0; i < 2; i++)
{
for (int j = 0; j < distances.Length - i - 1; j++)
{
if (distances[j].Distance < distances[j + 1].Distance)
{
ColorDistance swap = distances[j];
distances[j] = distances[j + 1];
distances[j + 1] = swap;
}
}
}
return(distances[distances.Length - 1].Index);
}
public int GetNearestColorIndexDither(Color colorTarget, int x, int y, ColorSpace colorSpace, Dither dither)
{
if (Colors.Length <= 1)
{
return(0);
}
if (Colors.Length <= 2)
{
return(1);
}
if (colorTarget.ToArgb() == Colors[0].ToArgb())
{
//. color key.
return(0);
}
ColorDistance[] distances = new ColorDistance[Colors.Length - 1];
for (int i = 0; i < distances.Length; i++)
{
distances[i] = new ColorDistance(i + 1, Colors[i + 1], colorSpace.Distance(Colors[i + 1], colorTarget));
}
for (int i = 0; i < 2; i++)
{
for (int j = 0; j < distances.Length - i - 1; j++)
{
if (distances[j].Distance < distances[j + 1].Distance)
{
ColorDistance swap = distances[j];
distances[j] = distances[j + 1];
distances[j + 1] = swap;
}
}
}
Color color1 = distances[distances.Length - 1].Color;
Color color2 = distances[distances.Length - 2].Color;
float f = distances[distances.Length - 1].Distance + distances[distances.Length - 2].Distance;
float fLerp = 0.0f;
if (f > 0)
{
fLerp = FMath.Powf(distances[distances.Length - 1].Distance / f, 1.0f);
}
return(dither.SelectDither(x, y, fLerp) == 0 ? distances[distances.Length - 1].Index : distances[distances.Length - 2].Index);
}