/// <summary>Detects the most common colors.</summary>
/// <param name="max">The maximum number of colors to retrieve.</param>
/// <returns>Returns an array of <see cref="T:Cave.Media.ARGB" /> values.</returns>
public IList <ARGB> DetectColors(int max)
{
if ((Width + Height) / 2 > max)
{
using (var bmp = Resize(max, max, ResizeMode.None))
{
return(bmp.DetectColors(max));
}
}
var colorCounters = new List <ColorCounter>();
for (int y = 0; y < Height; y++)
{
var data = Data.Data;
var colorDict = new Dictionary <ARGB, ColorCounter>();
unsafe
{
fixed(int *p = &data[0])
{
for (int i = 0; i < data.Length; i++)
{
ARGB color = p[i];
if (!colorDict.ContainsKey(color))
{
colorDict.Add(color, new ColorCounter(color, 1));
}
else
{
colorDict[color].Count++;
}
}
}
}
colorCounters.AddRange(colorDict.Values);
}
uint distance = 255;
while (colorCounters.Count > max)
{
colorCounters.Sort();
colorCounters = ColorCounter.Reduce(colorCounters, ref distance);
distance += 255;
}
colorCounters.Sort();
var colors = new List <ARGB>(colorCounters.Count);
for (int i = 0; i < colorCounters.Count; i++)
{
colors.Add(colorCounters[i].Color);
}
return(colors);
}
/// <summary>
/// Reduces the the colors of the image to the specified color count.
/// </summary>
/// <param name="colorCount">Number of colors to keep.</param>
/// <returns>Returns the resulting color palette.</returns>
public ARGB[] GetColors(uint colorCount)
{
var colorCounters = new List <ColorCounter>();
{
var colorDict = new Dictionary <int, ColorCounter>();
for (var i = 0; i < Data.Length; i++)
{
var color = Data[i];
if (!colorDict.ContainsKey(color))
{
colorDict.Add(color, new ColorCounter(color, 1));
}
else
{
colorDict[color].Count++;
}
}
colorCounters.AddRange(colorDict.Values);
}
var distance = 255000 / colorCount;
while (colorCounters.Count > colorCount)
{
colorCounters.Sort();
colorCounters = ColorCounter.Reduce(colorCounters, ref distance);
distance *= 2;
}
colorCounters.Sort();
var colors = new ARGB[colorCounters.Count];
for (var i = 0; i < colors.Length; i++)
{
colors[i] = colorCounters[i].Color;
}
return(colors);
}