public static (IEnumerable <int> indeces, IList <Color> palette) Quantize(Bitmap image, QuantizeImageSettings settings)
{
Setup(image, settings);
var colors = Decompose(image);
var indices = settings.Ditherer?.Process(colors) ?? settings.Quantizer.Process(colors);
return(indices, settings.Quantizer.GetPalette());
}
private void ReadPixels(byte[] pixels)
{
if (QuantizationType == ColorQuantizationType.Neural)
{
#region Neural
if (GlobalQuantizer == null || !UseGlobalColorTable)
{
GlobalQuantizer = new NeuralQuantizer(SamplingFactor, MaximumNumberColor)
{
MaxColors = MaximumNumberColor,
TransparentColor = !IsFirstFrame || UseGlobalColorTable || UseFullTransparency ? TransparentColor : null
};
GlobalQuantizer.FirstPass(pixels);
ColorTable = GlobalQuantizer.GetPalette();
}
//Indexes the pixels to the color table.
IndexedPixels = GlobalQuantizer.SecondPass(pixels);
#endregion
}
else if (QuantizationType == ColorQuantizationType.Octree)
{
#region Octree
var quantizer = new OctreeQuantizer
{
MaxColors = MaximumNumberColor,
TransparentColor = !IsFirstFrame || UseGlobalColorTable || UseFullTransparency ? TransparentColor : null
};
IndexedPixels = quantizer.Quantize(pixels);
ColorTable = quantizer.ColorTable;
#endregion
}
else if (QuantizationType == ColorQuantizationType.MedianCut)
{
#region Median cut
if (GlobalQuantizer == null || !UseGlobalColorTable)
{
GlobalQuantizer = new MedianCutQuantizer
{
MaxColors = MaximumNumberColor,
TransparentColor = !IsFirstFrame || UseGlobalColorTable || UseFullTransparency ? TransparentColor : null
};
GlobalQuantizer.FirstPass(pixels);
ColorTable = GlobalQuantizer.GetPalette();
}
//Indexes the pixels to the color table.
IndexedPixels = GlobalQuantizer.SecondPass(pixels);
#endregion
}
else if (QuantizationType == ColorQuantizationType.Grayscale)
{
#region Grayscale
//This quantizer uses a fixed palette (generated during object instantiation), so most calculations are called one time.
if (GlobalQuantizer == null)
{
//Since the color table does not change among frames, it can be stored globally.
UseGlobalColorTable = true;
var transparent = !IsFirstFrame || UseGlobalColorTable || UseFullTransparency ? TransparentColor : null;
GlobalQuantizer = new GrayscaleQuantizer(transparent, MaximumNumberColor)
{
MaxColors = MaximumNumberColor,
TransparentColor = transparent
};
ColorTable = GlobalQuantizer.GetPalette();
}
//Each frame still needs to be quantized.
IndexedPixels = GlobalQuantizer.SecondPass(pixels);
#endregion
}
else if (QuantizationType == ColorQuantizationType.MostUsed)
{
#region Most used colors
if (GlobalQuantizer == null || !UseGlobalColorTable)
{
GlobalQuantizer = new MostUsedQuantizer
{
MaxColors = MaximumNumberColor,
TransparentColor = !IsFirstFrame || UseGlobalColorTable || UseFullTransparency ? TransparentColor : null
};
GlobalQuantizer.FirstPass(pixels);
ColorTable = GlobalQuantizer.GetPalette();
}
//Indexes the pixels to the color table.
IndexedPixels = GlobalQuantizer.SecondPass(pixels);
#endregion
}
else
{
#region Palette
//This quantizer uses a fixed palette (generated during object instantiation), so it will be only called once.
if (GlobalQuantizer == null)
{
//Since the color table does not change among frames, it can be stored globally.
UseGlobalColorTable = true;
var transparent = !IsFirstFrame || UseGlobalColorTable || UseFullTransparency ? TransparentColor : null;
//TODO: Pass the palette.
//Default palettes: Windows, etc.
//User submitted > Presets > Generate palette based on first frame.
GlobalQuantizer = new PaletteQuantizer(new ArrayList())
{
MaxColors = MaximumNumberColor,
TransparentColor = transparent
};
ColorTable = GlobalQuantizer.GetPalette();
}
//Each frame still needs to be quantized.
IndexedPixels = GlobalQuantizer.SecondPass(pixels);
#endregion
}
//I need to signal the other method that I'll need transparency.
ColorTableHasTransparency = TransparentColor.HasValue && ColorTable.Contains(TransparentColor.Value);
}