private void WriteIndexedImage(Stream output, BitmapFrame frame, BitmapPalette[] palettes)
{
byte[] buff = new byte[4];
foreach (Color color in palettes.SelectMany(p => p.Colors))
{
buff[0] = color.B;
buff[1] = color.G;
buff[2] = color.R;
buff[3] = color.A;
output.Write(buff, 0, buff.Length);
}
Int32Rect rect;
using (SafeHGlobalHandle buffer = frame.GetPixels(out rect))
{
using (UnmanagedMemoryStream ums = new UnmanagedMemoryStream(buffer, buffer.Length, buffer.Length, FileAccess.Read))
ums.CopyTo(output, Math.Min(32 * 1024, buffer.Length));
}
}
