コード例 #1
0
        static string outfilename; /* for -outfile switch */

        public static void Main(string[] args)
        {
            progname = Path.GetFileName(Environment.GetCommandLineArgs()[0]);

            cd_jpeg_error_mgr    err   = new cd_jpeg_error_mgr();
            jpeg_compress_struct cinfo = new jpeg_compress_struct(err);

            /* Initialize JPEG parameters.
             * Much of this may be overridden later.
             * In particular, we don't yet know the input file's color space,
             * but we need to provide some value for jpeg_set_defaults() to work.
             */

            cinfo.In_color_space = J_COLOR_SPACE.JCS_RGB; /* arbitrary guess */
            cinfo.jpeg_set_defaults();

            /* Scan command line to find file names.
             * It is convenient to use just one switch-parsing routine, but the switch
             * values read here are ignored; we will rescan the switches after opening
             * the input file.
             */
            int file_index;

            if (!parse_switches(cinfo, args, false, out file_index))
            {
                usage();
                return;
            }

            /* Must have either -outfile switch or explicit output file name */
            if (outfilename == null)
            {
                // file_index should point to input file
                if (file_index != args.Length - 2)
                {
                    Console.WriteLine(string.Format("{0}: must name one input and one output file.", progname));
                    usage();
                    return;
                }

                // output file comes right after input one
                outfilename = args[file_index + 1];
            }
            else
            {
                // file_index should point to input file
                if (file_index != args.Length - 1)
                {
                    Console.WriteLine(string.Format("{0}: must name one input and one output file.", progname));
                    usage();
                    return;
                }
            }

            /* Open the input file. */
            FileStream input_file = null;

            if (file_index < args.Length)
            {
                try
                {
                    input_file = new FileStream(args[file_index], FileMode.Open);
                }
                catch (Exception e)
                {
                    Console.WriteLine(string.Format("{0}: can't open {1}", progname, args[file_index]));
                    Console.WriteLine(e.Message);
                    return;
                }
            }
            else
            {
                Console.WriteLine(string.Format("{0}: sorry, can't read file from console"));
                return;
            }

            /* Open the output file. */
            FileStream output_file = null;

            if (outfilename != null)
            {
                try
                {
                    output_file = new FileStream(outfilename, FileMode.Create);
                }
                catch (Exception e)
                {
                    Console.WriteLine(string.Format("{0}: can't open {1}", progname, args[file_index]));
                    Console.WriteLine(e.Message);
                    return;
                }
            }
            else
            {
                Console.WriteLine(string.Format("{0}: sorry, can't write file to console"));
                return;
            }

            /* Figure out the input file format, and set up to read it. */
            cjpeg_source_struct src_mgr = new bmp_source_struct(cinfo);

            src_mgr.input_file = input_file;

            /* Read the input file header to obtain file size & colorspace. */
            src_mgr.start_input();

            /* Now that we know input colorspace, fix colorspace-dependent defaults */
            cinfo.jpeg_default_colorspace();

            /* Adjust default compression parameters by re-parsing the options */
            parse_switches(cinfo, args, true, out file_index);

            /* Specify data destination for compression */
            cinfo.jpeg_stdio_dest(output_file);

            /* Start compressor */
            cinfo.jpeg_start_compress(true);

            /* Process data */
            while (cinfo.Next_scanline < cinfo.Image_height)
            {
                int num_scanlines = src_mgr.get_pixel_rows();
                cinfo.jpeg_write_scanlines(src_mgr.buffer, num_scanlines);
            }

            /* Finish compression and release memory */
            src_mgr.finish_input();
            cinfo.jpeg_finish_compress();

            /* Close files, if we opened them */
            input_file.Close();
            input_file.Dispose();

            output_file.Close();
            output_file.Dispose();

            /* All done. */
            if (cinfo.Err.Num_warnings != 0)
            {
                Console.WriteLine("Corrupt-data warning count is not zero");
            }
        }
コード例 #2
0
ファイル: Program.cs プロジェクト: lygroup/libjpeg.net
        static string outfilename;   /* for -outfile switch */

        public static void Main(string[] args)
        {
            progname = Path.GetFileName(Environment.GetCommandLineArgs()[0]);

            cd_jpeg_error_mgr err = new cd_jpeg_error_mgr();
            jpeg_compress_struct cinfo = new jpeg_compress_struct(err);

            /* Initialize JPEG parameters.
             * Much of this may be overridden later.
             * In particular, we don't yet know the input file's color space,
             * but we need to provide some value for jpeg_set_defaults() to work.
             */

            cinfo.In_color_space = J_COLOR_SPACE.JCS_RGB; /* arbitrary guess */
            cinfo.jpeg_set_defaults();

            /* Scan command line to find file names.
             * It is convenient to use just one switch-parsing routine, but the switch
             * values read here are ignored; we will rescan the switches after opening
             * the input file.
             */
            int file_index;
            if (!parse_switches(cinfo, args, false, out file_index))
            {
                usage();
                return;
            }

            /* Must have either -outfile switch or explicit output file name */
            if (outfilename == null)
            {
                // file_index should point to input file 
                if (file_index != args.Length - 2)
                {
                    Console.WriteLine(string.Format("{0}: must name one input and one output file.", progname));
                    usage();
                    return;
                }

                // output file comes right after input one
                outfilename = args[file_index + 1];
            }
            else
            {
                // file_index should point to input file
                if (file_index != args.Length - 1)
                {
                    Console.WriteLine(string.Format("{0}: must name one input and one output file.", progname));
                    usage();
                    return;
                }
            }

            /* Open the input file. */
            FileStream input_file = null;
            if (file_index < args.Length)
            {
                try
                {
                    input_file = new FileStream(args[file_index], FileMode.Open);
                }
                catch (Exception e)
                {
                    Console.WriteLine(string.Format("{0}: can't open {1}", progname, args[file_index]));
                    Console.WriteLine(e.Message);
                    return;
                }
            }
            else
            {
                Console.WriteLine(string.Format("{0}: sorry, can't read file from console"));
                return;
            }

            /* Open the output file. */
            FileStream output_file = null;
            if (outfilename != null)
            {
                try
                {
                    output_file = new FileStream(outfilename, FileMode.Create);
                }
                catch (Exception e)
                {
                    Console.WriteLine(string.Format("{0}: can't open {1}", progname, args[file_index]));
                    Console.WriteLine(e.Message);
                    return;	
                }
            }
            else
            {
                Console.WriteLine(string.Format("{0}: sorry, can't write file to console"));
                return;
            }

            /* Figure out the input file format, and set up to read it. */
            cjpeg_source_struct src_mgr = new bmp_source_struct(cinfo);
            src_mgr.input_file = input_file;

            /* Read the input file header to obtain file size & colorspace. */
            src_mgr.start_input();

            /* Now that we know input colorspace, fix colorspace-dependent defaults */
            cinfo.jpeg_default_colorspace();

            /* Adjust default compression parameters by re-parsing the options */
            parse_switches(cinfo, args, true, out file_index);

            /* Specify data destination for compression */
            cinfo.jpeg_stdio_dest(output_file);

            /* Start compressor */
            cinfo.jpeg_start_compress(true);

            /* Process data */
            while (cinfo.Next_scanline < cinfo.Image_height)
            {
                int num_scanlines = src_mgr.get_pixel_rows();
                cinfo.jpeg_write_scanlines(src_mgr.buffer, num_scanlines);
            }

            /* Finish compression and release memory */
            src_mgr.finish_input();
            cinfo.jpeg_finish_compress();

            /* Close files, if we opened them */
            input_file.Close();
            input_file.Dispose();

            output_file.Close();
            output_file.Dispose();

            /* All done. */
            if (cinfo.Err.Num_warnings != 0)
                Console.WriteLine("Corrupt-data warning count is not zero");
        }