public static unsafe void CopyTo(this Bitmap bmp, Bitmap dest)
{
int w = Math.Min(bmp.Width, dest.Width);
int h = Math.Min(bmp.Height, dest.Height);
using (DIB dib = new DIB(w, h, dest.PixelFormat))
{
dib.ReadBitmap(bmp, w, h);
dib.WriteBitmap(dest, w, h);
}
}
