System.Drawing.Bitmap.flipImageYAxis C# (CSharp) Метод

        private void flipImageYAxis(IntPtr source, IntPtr dest, int stride, int height, int size)
        {
            long top, bottom;
            byte[] buffer;
            long topP;
            long bottomP;
            long rowBytes;

            top = 0;
            bottom = height - 1;
            rowBytes = stride;

            var mData = new byte[size];
            Marshal.Copy(source, mData, 0, size);

            buffer = new byte[rowBytes];

            while (top < bottom) {
                topP = top * rowBytes;
                bottomP = bottom * rowBytes;

                /*
                 * Save and swap scanlines.
                 *
                 * This code does a simple in-place exchange with a temp buffer.
                 * If you need to reformat the pixels, replace the first two Array.Copy
                 * calls with your own custom pixel reformatter.
                 */
                Array.Copy (mData, topP, buffer, 0, rowBytes);
                Array.Copy (mData, bottomP, mData, topP, rowBytes);
                Array.Copy (buffer, 0, mData, bottomP, rowBytes);

                ++top;
                --bottom;

            }

            Marshal.Copy(mData, 0, dest, size);
        }