BitMiracle.LibTiff.Classic.TiffRgbaImage.gtStripContig C# (CSharp) Метод

        private static bool gtStripContig(TiffRgbaImage img, int[] raster, int offset, int width, int height)
        {
            byte[] buf = new byte[img.tif.StripSize()];

            int flip = img.setorientation();
            int y;
            int rasterShift;
            if ((flip & FLIP_VERTICALLY) != 0)
            {
                y = height - 1;
                rasterShift = -(width + width);
            }
            else
            {
                y = 0;
                rasterShift = -(width - width);
            }

            FieldValue[] result = img.tif.GetFieldDefaulted(TiffTag.ROWSPERSTRIP);
            int rowsperstrip = result[0].ToInt();
            if (rowsperstrip == -1)
            {
                // San Chen <[email protected]>
                // HACK: should be UInt32.MaxValue
                rowsperstrip = Int32.MaxValue;
            }

            result = img.tif.GetFieldDefaulted(TiffTag.YCBCRSUBSAMPLING);
            short subsamplingver = result[1].ToShort();

            int scanline = img.tif.newScanlineSize();
            int bufferShift = (width < img.width ? img.width - width : 0);
            bool ret = true;

            for (int row = 0; row < height; )
            {
                int rowstoread = rowsperstrip - (row + img.row_offset) % rowsperstrip;
                int nrow = (row + rowstoread > height ? height - row : rowstoread);
                int nrowsub = nrow;
                if ((nrowsub % subsamplingver) != 0)
                    nrowsub += subsamplingver - nrowsub % subsamplingver;

                if (img.tif.ReadEncodedStrip(img.tif.ComputeStrip(row + img.row_offset, 0), buf, 0, ((row + img.row_offset) % rowsperstrip + nrowsub) * scanline) < 0 && img.stoponerr)
                {
                    ret = false;
                    break;
                }

                int pos = ((row + img.row_offset) % rowsperstrip) * scanline;
                img.putContig(img, raster, offset + y * width, rasterShift, 0, y, width, nrow, buf, pos, bufferShift);
                y += (flip & FLIP_VERTICALLY) != 0 ? -nrow : nrow;
                row += nrow;
            }

            if ((flip & FLIP_HORIZONTALLY) != 0)
            {
                for (int line = 0; line < height; line++)
                {
                    int left = offset + line * width;
                    int right = left + width - 1;

                    while (left < right)
                    {
                        int temp = raster[left];
                        raster[left] = raster[right];
                        raster[right] = temp;
                        left++;
                        right--;
                    }
                }
            }

            return ret;
        }