Program.cs

        static unsafe void Main(string[] args)
        {
            Bitmap bmp = Image.FromFile("Testfile.bmp") as Bitmap;
            if (bmp.Width != 160 || bmp.Height != 43)
                throw new ArgumentException("Invalid bitmap size");

            byte[] buffer = new byte[160 * 43];
            var bmpData = bmp.LockBits(new Rectangle(0, 0, 160, 43), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppRgb);

            byte* pixel = (byte*)bmpData.Scan0.ToPointer();

            for (int y = 0, y_dest = 42; y < 43; ++y, --y_dest)
            {
                for (int x = 0; x < 160; ++x)
                {
                    buffer[y_dest * 160 + x] = pixel[(y * 160 + x) * 4];
                }
            }

            bmp.UnlockBits(bmpData);
        }