Hjg.Pngcs.PngWriter.SumRowbfilter C# (CSharp) Method

        private long SumRowbfilter()
        {
            // sums absolute value
            long s = 0;
            for (int i = 1; i <= ImgInfo.BytesPerRow; i++)
                if (rowbfilter[i] < 0)
                    s -= (long)rowbfilter[i];
                else
                    s += (long)rowbfilter[i];
            return s;
        }