public static Palette CalculatePalette(Bitmap img, int paletteSize)
{
Palette palette = new Palette();
Palette lastGoodPalette = null;
// sanity check
if (paletteSize < 8)
{
throw new ArgumentException("Palette size must be at least 8.");
}
if (paletteSize > 256)
{
throw new ArgumentException("Palette size must be at most 256.");
}
// reduce the mask length until we have the right number of colors
while (true)
{
// count the number of colors, maybe there are only paletteSize colors?!
bool tooManyColors = false;
for (int x = 0; x < img.Width; x++)
{
for (int y = 0; y < img.Height; y++)
{
if (palette.map.Count >= 255)
{
tooManyColors = true;
break;
}
palette.GetPaletteColor(img.GetPixel(x, y));
}
if (palette.map.Count > paletteSize)
{
break;
}
}
// check for a good palette
if (!tooManyColors && palette.map.Count > 0)
{
lastGoodPalette = palette;
palette = new Palette(palette);
if (!palette.IncreaseSpetrum())
{
break;
}
}
else
{
// did we already find the best palette?
if (lastGoodPalette != null)
{
break;
}
// generate smaller masks for the next run
palette.ReduceSpectrum();
}
}
return(lastGoodPalette);
}
public abstract bool SendColorPalette(Palette palette);
