/// <summary>
/// Factory-method to generate a ColorCutQuantizer from a PixelBuffer object.
/// </summary>
public static ColorCutQuantizer FromBitmap(PixelBuffer pixelBuffer, Rectangle region, int maxColors)
{
int width;
int height;
int[] pixels;
int i, j, index = 0;
if (region == null)
{
width = (int)pixelBuffer.GetWidth(); height = (int)pixelBuffer.GetHeight(); i = 0; j = 0;
}
else
{
width = region.Width; height = region.Height; i = region.X; j = region.Y;
}
Tizen.Log.Info("Palette", "Get pixels rawdata from (" + i + " " + j + " " + width + " " + height + ")" + "\n");
pixels = new int[width * height];
PixelFormat format = pixelBuffer.GetPixelFormat();
int pixelLength = (int)ColorUtils.GetBytesPerPixel(format);
IntPtr bufferIntPtr = pixelBuffer.GetBuffer();
unsafe
{
byte *rawdata = (byte *)bufferIntPtr.ToPointer();
int totalLength = width * height * pixelLength;
for (i = 0; i < totalLength; i += pixelLength)
{
//RGB888
if (pixelLength == 3)
{
pixels[index++] = (255 & 0xff) << 24 | (rawdata[i] & 0xff) << 16 | (rawdata[i + 1] & 0xff) << 8 | (rawdata[i + 2] & 0xff);
}
//RGBA8888
else
{
pixels[index++] = (rawdata[i + 3] & 0xff) << 24 | (rawdata[i] & 0xff) << 16 | (rawdata[i + 1] & 0xff) << 8 | (rawdata[i + 2] & 0xff);
}
}
}
return(new ColorCutQuantizer(new ColorHistogram(pixels), maxColors));
}
