public IndexedImage(ColorList colorList, Bitmap bitmap, ColorSpace colorSpace, Dither dither)
{
ColorList = colorList;
Width = bitmap.Width;
Height = bitmap.Height;
Pixels = new int[Width * Height];
for (int y = 0; y < Height; y++)
{
if (y % 10 == 0)
{
Console.WriteLine("Indexing... {0}/{1}", y, Height);
}
for (int x = 0; x < Width; x++)
{
Color color = bitmap.GetPixel(x, y);
SetIndex(x, y, ColorList.GetNearestColorIndexDither(color, x, y, colorSpace, dither));
//SetIndex( x, y, ColorList.GetNearestColorIndex(color) );
}
}
}
public int GetNearestColorIndexDither(Color colorTarget, int x, int y, ColorSpace colorSpace, Dither dither)
{
ColorDistance[] distances = new ColorDistance[Colors.Length];
for (int i = 0; i < distances.Length; i++)
{
distances[i] = new ColorDistance(i, Colors[i], colorSpace.Distance(Colors[i], 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[Colors.Length - 1].Color;
Color color2 = distances[Colors.Length - 2].Color;
float f = distances[Colors.Length - 1].Distance + distances[13].Distance;
float fLerp = 0.0f;
if (f > 0)
{
fLerp = FMath.Powf(distances[Colors.Length - 1].Distance / f, 1.0f);
}
return(dither.SelectDither(x, y, fLerp) == 0 ? distances[Colors.Length - 1].Index : distances[Colors.Length - 2].Index);
}
