public Image QuantizeImage(Bitmap image, int alphaThreshold, int alphaFader, int maxColorCount)
{
MaxColor = maxColorCount;
int colorCount = maxColorCount;
ColorData moments = QuantizerBase.CalculateMoments(QuantizerBase.BuildHistogram(image, alphaThreshold, alphaFader));
IEnumerable<Box> cubes = this.SplitData(ref colorCount, moments);
QuantizedPalette quantizedPalette = this.GetQuantizedPalette(colorCount, moments, cubes, alphaThreshold);
return (Image)QuantizerBase.ProcessImagePixels((Image)image, quantizedPalette);
}
private static Bitmap ProcessImagePixels(Image sourceImage, QuantizedPalette palette)
{
Bitmap bitmap = new Bitmap(sourceImage.Width, sourceImage.Height, PixelFormat.Format8bppIndexed);
ColorPalette palette1 = bitmap.Palette;
for (int index = 0; index < palette.Colors.Count; ++index)
{
palette1.Entries[index] = palette.Colors[index];
}
bitmap.Palette = palette1;
BitmapData bitmapdata = (BitmapData)null;
try
{
bitmapdata = bitmap.LockBits(Rectangle.FromLTRB(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.WriteOnly, bitmap.PixelFormat);
int num1 = bitmapdata.Stride < 0 ? -bitmapdata.Stride : bitmapdata.Stride;
int length1 = Math.Max(1, 1);
int length2 = num1 * bitmap.Height;
int num2 = 0;
byte[] source = new byte[length2];
byte[] numArray = new byte[length1];
int index1 = 0;
for (int index2 = 0; index2 < bitmap.Height; ++index2)
{
int num3 = 0;
for (int index3 = 0; index3 < bitmap.Width; ++index3)
{
int num4 = num3 >> 3;
numArray[0] = palette.PixelIndex[index1] == -1 ? (byte)(palette.Colors.Count - 1) : (byte)palette.PixelIndex[index1];
++index1;
for (int index4 = 0; index4 < length1; ++index4)
{
source[num2 + index4 + num4] = numArray[index4];
}
num3 += 8;
}
num2 += num1;
}
Marshal.Copy(source, 0, bitmapdata.Scan0, length2);
}
finally
{
if (bitmapdata != null)
{
bitmap.UnlockBits(bitmapdata);
}
}
return(bitmap);
}
public Bitmap QuantizeImage(Bitmap image, int alphaThreshold, int alphaFader, int maxColorCount)
{
if (image.PixelFormat != PixelFormat.Format32bppArgb)
{
image = image.ConvertToFormat32();
}
if (Program.DisableQuantization())
{
Console.WriteLine("[WARNING] By disabling quantization, only the first 255 unique colors will be taken into account");
return(image);
}
mMaxColor = maxColorCount + 1;
mMaxColor = Math.Min(mMaxColor, 256);
int colorCount = mMaxColor;
ColorData moments = QuantizerBase.CalculateMoments(QuantizerBase.BuildHistogram(image, alphaThreshold, alphaFader));
IEnumerable <Box> cubes = this.SplitData(ref colorCount, moments);
QuantizedPalette quantizedPalette = this.GetQuantizedPalette(colorCount, moments, cubes, alphaThreshold);
return(ProcessImagePixels((Image)image, quantizedPalette));
}
protected override QuantizedPalette GetQuantizedPalette(
int colorCount,
ColorData data,
IEnumerable <Box> cubes,
int alphaThreshold)
{
int pixelsCount1 = data.PixelsCount;
LookupData lookupData = this.BuildLookups(cubes, data);
IList <int> quantizedPixels = data.QuantizedPixels;
for (int index = 0; index < pixelsCount1; ++index)
{
byte[] bytes = BitConverter.GetBytes(quantizedPixels[index]);
quantizedPixels[index] = lookupData.Tags[(int)bytes[3], (int)bytes[2], (int)bytes[1], (int)bytes[0]];
}
int[] numArray1 = new int[colorCount + 1];
int[] numArray2 = new int[colorCount + 1];
int[] numArray3 = new int[colorCount + 1];
int[] numArray4 = new int[colorCount + 1];
int[] numArray5 = new int[colorCount + 1];
QuantizedPalette quantizedPalette = new QuantizedPalette(pixelsCount1);
IList <Pixel> pixels = data.Pixels;
int pixelsCount2 = data.PixelsCount;
IList <Lookup> lookups = lookupData.Lookups;
int count = lookups.Count;
Dictionary <int, int> dictionary = new Dictionary <int, int>();
for (int index1 = 0; index1 < pixelsCount2; ++index1)
{
Pixel pixel = pixels[index1];
quantizedPalette.PixelIndex[index1] = -1;
if ((int)pixel.Alpha > alphaThreshold)
{
int argb = pixel.Argb;
int index2;
if (!dictionary.TryGetValue(argb, out index2))
{
index2 = quantizedPixels[index1];
int num1 = int.MaxValue;
for (int index3 = 0; index3 < count; ++index3)
{
Lookup lookup = lookups[index3];
int num2 = (int)pixel.Alpha - lookup.Alpha;
int num3 = (int)pixel.Red - lookup.Red;
int num4 = (int)pixel.Green - lookup.Green;
int num5 = (int)pixel.Blue - lookup.Blue;
int num6 = num2 * num2 + num3 * num3 + num4 * num4 + num5 * num5;
if (num6 < num1)
{
num1 = num6;
index2 = index3;
}
}
dictionary[argb] = index2;
}
numArray1[index2] += (int)pixel.Alpha;
numArray2[index2] += (int)pixel.Red;
numArray3[index2] += (int)pixel.Green;
numArray4[index2] += (int)pixel.Blue;
++numArray5[index2];
quantizedPalette.PixelIndex[index1] = index2;
}
}
for (int index = 0; index < colorCount; ++index)
{
if (numArray5[index] > 0)
{
numArray1[index] /= numArray5[index];
numArray2[index] /= numArray5[index];
numArray3[index] /= numArray5[index];
numArray4[index] /= numArray5[index];
}
if (numArray1[index] >= 0 && numArray2[index] >= 0 && numArray3[index] >= 0 && numArray4[index] >= 0)
{
Color color = Color.FromArgb(numArray1[index], numArray2[index], numArray3[index], numArray4[index]);
quantizedPalette.Colors.Add(color);
}
}
quantizedPalette.Colors.Add(Color.FromArgb(0, 0, 0, 0));
return(quantizedPalette);
}