private static IEnumerable <SColorInfo> SolveRootLevel(IEnumerable <SColorInfo> colors, Int32 colorCount)
{
// initializes the comparers based on hue, saturation and brightness (HSB color model)
ColorHueComparer hueComparer = new ColorHueComparer();
ColorSaturationComparer saturationComparer = new ColorSaturationComparer();
ColorBrightnessComparer brightnessComparer = new ColorBrightnessComparer();
// selects three palettes: 1) hue is unique, 2) saturation is unique, 3) brightness is unique
Dictionary <Single, SColorInfo> hueColors, saturationColors, brightnessColors;
SelectDistinct(colors, out hueColors, out saturationColors, out brightnessColors);
// selects the palette (from those 3) which has the most colors, because an image has some details in that category)
if (hueColors.Count > saturationColors.Count && hueColors.Count > brightnessColors.Count)
{
colors = Solve2ndLevel(colors, hueColors, saturationComparer, brightnessComparer, colorCount);
}
else if (saturationColors.Count > hueColors.Count && saturationColors.Count > brightnessColors.Count)
{
colors = Solve2ndLevel(colors, saturationColors, hueComparer, brightnessComparer, colorCount);
}
else
{
colors = Solve2ndLevel(colors, brightnessColors, hueComparer, saturationComparer, colorCount);
}
return(colors);
}
private static IEnumerable <Color> SolveRootLevel(int colorCount, IEnumerable <Color> colors)
{
// initializes the comparers based on hue, saturation and brightness (HSB color model)
ColorHueComparer hueComparer = new ColorHueComparer();
ColorSaturationComparer saturationComparer = new ColorSaturationComparer();
ColorBrightnessComparer brightnessComparer = new ColorBrightnessComparer();
// selects three palettes: 1) hue is unique, 2) saturation is unique, 3) brightness is unique
IEnumerable <Color> hueColors = colors.Distinct(hueComparer);
IEnumerable <Color> saturationColors = colors.Distinct(saturationComparer);
IEnumerable <Color> brightnessColors = colors.Distinct(brightnessComparer);
// retrieves number of colors, ie. how many we've eliminated
Int32 hueColorCount = hueColors.Count();
Int32 saturationColorCount = saturationColors.Count();
Int32 brightnessColorCount = brightnessColors.Count();
// selects the palette (from those 3) which has the most colors, because an image has some details in that category
if (hueColorCount > saturationColorCount && hueColorCount > brightnessColorCount)
{
colors = Solve2ndLevel(hueColors, saturationComparer, brightnessComparer, colorCount);
}
else if (saturationColorCount < hueColorCount && saturationColorCount < brightnessColorCount)
{
colors = Solve2ndLevel(saturationColors, hueComparer, brightnessComparer, colorCount);
}
else
{
colors = Solve2ndLevel(brightnessColors, hueComparer, saturationComparer, colorCount);
}
return(colors);
}
/// <summary>
/// See <see cref="BaseColorCacheQuantizer.OnGetPaletteToCache"/> for more details.
/// </summary>
protected override List <Color> OnGetPaletteToCache(Int32 colorCount)
{
// otherwise calculate one
palette.Clear();
// lucky seed :)
FastRandom random = new FastRandom(13);
#if (UseDictionary)
List <DistinctColorInfo> colorInfoList = colorMap.Values.ToList();
#else
List <DistinctColorInfo> colorInfoList = rootBucket.GetValues().ToList();
#endif
foundColorCount = colorInfoList.Count;
if (foundColorCount >= colorCount)
{
// shuffles the colormap
colorInfoList = colorInfoList.
OrderBy(entry => random.Next(foundColorCount)).
ToList();
// workaround for backgrounds, the most prevalent color
DistinctColorInfo background = colorInfoList.MaxBy(info => info.Count);
colorInfoList.Remove(background);
colorCount--;
ColorHueComparer hueComparer = new ColorHueComparer();
ColorSaturationComparer saturationComparer = new ColorSaturationComparer();
ColorBrightnessComparer brightnessComparer = new ColorBrightnessComparer();
// generates catalogue
List <IEqualityComparer <DistinctColorInfo> > comparers = new List <IEqualityComparer <DistinctColorInfo> > {
hueComparer, saturationComparer, brightnessComparer
};
// take adequate number from each slot
while (ProcessList(colorCount, colorInfoList, comparers, out colorInfoList))
{
}
Int32 listColorCount = colorInfoList.Count();
if (listColorCount > 0)
{
Int32 allowedTake = Math.Min(colorCount, listColorCount);
colorInfoList = colorInfoList.Take(allowedTake).ToList();
}
// adds background color first
palette.Add(Color.FromArgb(background.Color));
}
// adds the selected colors to a final palette
palette.AddRange(colorInfoList.Select(colorInfo => Color.FromArgb(colorInfo.Color)));
// returns our new palette
return(palette);
}