BitMiracle.LibJpeg.Classic.Internal.jpeg_d_coef_controller.decompress_data_ordinary C# (CSharp) Method

        private ReadResult decompress_data_ordinary(ComponentBuffer[] output_buf)
        {
            /* Force some input to be done if we are getting ahead of the input. */
            while (m_cinfo.m_input_scan_number < m_cinfo.m_output_scan_number ||
                   (m_cinfo.m_input_scan_number == m_cinfo.m_output_scan_number &&
                    m_cinfo.m_input_iMCU_row <= m_cinfo.m_output_iMCU_row))
            {
                if (m_cinfo.m_inputctl.consume_input() == ReadResult.JPEG_SUSPENDED)
                    return ReadResult.JPEG_SUSPENDED;
            }

            int last_iMCU_row = m_cinfo.m_total_iMCU_rows - 1;

            /* OK, output from the virtual arrays. */
            for (int ci = 0; ci < m_cinfo.m_num_components; ci++)
            {
                jpeg_component_info componentInfo = m_cinfo.Comp_info[ci];

                /* Don't bother to IDCT an uninteresting component. */
                if (!componentInfo.component_needed)
                    continue;

                /* Align the virtual buffer for this component. */
                JBLOCK[][] buffer = m_whole_image[ci].Access(m_cinfo.m_output_iMCU_row * componentInfo.V_samp_factor,
                    componentInfo.V_samp_factor);

                /* Count non-dummy DCT block rows in this iMCU row. */
                int block_rows;
                if (m_cinfo.m_output_iMCU_row < last_iMCU_row)
                    block_rows = componentInfo.V_samp_factor;
                else
                {
                    /* NB: can't use last_row_height here; it is input-side-dependent! */
                    block_rows = componentInfo.height_in_blocks % componentInfo.V_samp_factor;
                    if (block_rows == 0)
                        block_rows = componentInfo.V_samp_factor;
                }

                /* Loop over all DCT blocks to be processed. */
                int rowIndex = 0;
                for (int block_row = 0; block_row < block_rows; block_row++)
                {
                    int output_col = 0;
                    for (int block_num = 0; block_num < componentInfo.Width_in_blocks; block_num++)
                    {
                        m_cinfo.m_idct.inverse(componentInfo.Component_index,
                            buffer[block_row][block_num].data, output_buf[ci], rowIndex, output_col);

                        output_col += componentInfo.DCT_h_scaled_size;
                    }

                    rowIndex += componentInfo.DCT_v_scaled_size;
                }
            }

            m_cinfo.m_output_iMCU_row++;
            if (m_cinfo.m_output_iMCU_row < m_cinfo.m_total_iMCU_rows)
                return ReadResult.JPEG_ROW_COMPLETED;

            return ReadResult.JPEG_SCAN_COMPLETED;
        }