BitMiracle.LibJpeg.Classic.jpeg_decompress_struct.transdecode_master_selection C# (CSharp) 메소드

        private void transdecode_master_selection()
        {
            /* This is effectively a buffered-image operation. */
            m_buffered_image = true;

            /* Compute output image dimensions and related values. */
            m_inputctl.jpeg_core_output_dimensions();

            if (arith_code)
                m_entropy = new arith_entropy_decoder(this);
            else
                m_entropy = new huff_entropy_decoder(this);

            /* Always get a full-image coefficient buffer. */
            m_coef = new jpeg_d_coef_controller(this, true);

            /* Initialize input side of decompressor to consume first scan. */
            m_inputctl.start_input_pass();

            /* Initialize progress monitoring. */
            if (m_progress != null)
            {
                int nscans = 1;
                /* Estimate number of scans to set pass_limit. */
                if (m_progressive_mode)
                {
                    /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */
                    nscans = 2 + 3 * m_num_components;
                }
                else if (m_inputctl.HasMultipleScans())
                {
                    /* For a nonprogressive multiscan file, estimate 1 scan per component. */
                    nscans = m_num_components;
                }

                m_progress.Pass_counter = 0;
                m_progress.Pass_limit = m_total_iMCU_rows * nscans;
                m_progress.Completed_passes = 0;
                m_progress.Total_passes = 1;
            }
        }