BitMiracle.LibTiff.Classic.Internal.JpegCodec.JPEGSetupDecode C# (CSharp) Метод

        private bool JPEGSetupDecode()
        {
            TiffDirectory td = m_tif.m_dir;

            InitializeLibJPEG(false, true);

            Debug.Assert(m_common.IsDecompressor);

            /* Read JPEGTables if it is present */
            if (m_tif.fieldSet(FIELD_JPEGTABLES))
            {
                m_decompression.Src = new JpegTablesSource(this);
                if (TIFFjpeg_read_header(false) != ReadResult.JPEG_HEADER_TABLES_ONLY)
                {
                    Tiff.ErrorExt(m_tif, m_tif.m_clientdata, "JPEGSetupDecode", "Bogus JPEGTables field");
                    return false;
                }
            }

            /* Grab parameters that are same for all strips/tiles */
            m_photometric = td.td_photometric;
            switch (m_photometric)
            {
                case Photometric.YCBCR:
                    m_h_sampling = td.td_ycbcrsubsampling[0];
                    m_v_sampling = td.td_ycbcrsubsampling[1];
                    break;
                default:
                    /* TIFF 6.0 forbids subsampling of all other color spaces */
                    m_h_sampling = 1;
                    m_v_sampling = 1;
                    break;
            }

            /* Set up for reading normal data */
            m_decompression.Src = new JpegStdSource(this);
            m_tif.m_postDecodeMethod = Tiff.PostDecodeMethodType.pdmNone; /* override byte swapping */
            return true;
        }