BitMiracle.LibJpeg.Classic.jpeg_decompress_struct.output_pass_setup C# (CSharp) Method

        private bool output_pass_setup()
        {
            if (m_global_state != JpegState.DSTATE_PRESCAN)
            {
                /* First call: do pass setup */
                m_master.prepare_for_output_pass();
                m_output_scanline = 0;
                m_global_state = JpegState.DSTATE_PRESCAN;
            }

            /* Loop over any required dummy passes */
            while (m_master.IsDummyPass())
            {
                 /* Crank through the dummy pass */
                while (m_output_scanline < m_output_height)
                {
                    int last_scanline;
                    /* Call progress monitor hook if present */
                    if (m_progress != null)
                    {
                        m_progress.Pass_counter = m_output_scanline;
                        m_progress.Pass_limit = m_output_height;
                        m_progress.Updated();
                    }

                    /* Process some data */
                    last_scanline = m_output_scanline;
                    m_main.process_data(null, ref m_output_scanline, 0);
                    if (m_output_scanline == last_scanline)
                    {
                        /* No progress made, must suspend */
                        return false;
                    }
                }

                /* Finish up dummy pass, and set up for another one */
                m_master.finish_output_pass();
                m_master.prepare_for_output_pass();
                m_output_scanline = 0;
            }

            /* Ready for application to drive output pass through
            * jpeg_read_scanlines or jpeg_read_raw_data.
            */
            m_global_state = m_raw_data_out ? JpegState.DSTATE_RAW_OK : JpegState.DSTATE_SCANNING;
            return true;
        }