private void GetMetaColors(object sender, RoutedEventArgs e)
{
var imageLength = ViewModel.Properties.PixelHeight * ViewModel.Properties.PixelWidth * 3;
var imagePtr = Marshal.AllocHGlobal(imageLength);
var outColorsPtr = Marshal.AllocHGlobal(ViewModel.MetaArgs.MetaCount * 3);
var pixels = ViewModel.Image.GetPixels();
for (var index = 0; index < pixels.Length; index++)
{
var pixel = pixels[index];
Marshal.WriteByte(imagePtr, index * 3 + 2, (byte)pixel); // B
Marshal.WriteByte(imagePtr, index * 3 + 1, (byte)(pixel >> 8)); // G
Marshal.WriteByte(imagePtr, index * 3, (byte)(pixel >> 16)); // R
}
MetaHelper.meta_calculate(imagePtr, imageLength, ViewModel.MetaArgs.MetaCount, outColorsPtr,
ViewModel.MetaArgs.MaxError);
ViewModel.MetaColors.Clear();
for (var index = 0; index < ViewModel.MetaArgs.MetaCount; index++)
{
var r = Marshal.ReadByte(outColorsPtr, index * 3);
var g = Marshal.ReadByte(outColorsPtr, index * 3 + 1);
var b = Marshal.ReadByte(outColorsPtr, index * 3 + 2);
ViewModel.MetaColors.Add(Color.FromRgb(r, g, b));
}
Marshal.FreeHGlobal(imagePtr);
Marshal.FreeHGlobal(outColorsPtr);
}