text: /* GTK - The GIMP Toolkit
   * gtkprintbackendfile.c: Default implementation of GtkPrintBackend 
   * for printing to a file
   * Copyright (C) 2003, Red Hat, Inc.
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library. If not, see <http://www.gnu.org/licenses/>.
   */
  
  #include "config.h"
  
  #include <unistd.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include <errno.h>
  #include <cairo.h>
  #include <cairo-pdf.h>
  #include <cairo-ps.h>
  #include <cairo-svg.h>
  
  #include <glib/gi18n-lib.h>
  
  #include "gtk/gtk.h"
  #include "gtk/gtkprinter-private.h"
  
  #include "gtkprintbackendfile.h"
  
  typedef struct _GtkPrintBackendFileClass GtkPrintBackendFileClass;
  
  #define GTK_PRINT_BACKEND_FILE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_PRINT_BACKEND_FILE, GtkPrintBackendFileClass))
  #define GTK_IS_PRINT_BACKEND_FILE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_PRINT_BACKEND_FILE))
  #define GTK_PRINT_BACKEND_FILE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_PRINT_BACKEND_FILE, GtkPrintBackendFileClass))
  
  #define _STREAM_MAX_CHUNK_SIZE 8192
  
  static GType print_backend_file_type = 0;
  
  struct _GtkPrintBackendFileClass
  {
    GtkPrintBackendClass parent_class;
  };
  
  struct _GtkPrintBackendFile
  {
    GtkPrintBackend parent_instance;
  };
  
  typedef enum
  {
    FORMAT_PDF,
    FORMAT_PS,
    FORMAT_SVG,
    N_FORMATS
  } OutputFormat;
  
  static const gchar* formats[N_FORMATS] =
  {
    "pdf",
    "ps",
    "svg"
  };
  
  static GObjectClass *backend_parent_class;
  
  static void                 gtk_print_backend_file_class_init      (GtkPrintBackendFileClass *class);
  static void                 gtk_print_backend_file_init            (GtkPrintBackendFile      *impl);
  static void                 file_printer_get_settings_from_options (GtkPrinter              *printer,
  								    GtkPrinterOptionSet     *options,
  								    GtkPrintSettings        *settings);
  static GtkPrinterOptionSet *file_printer_get_options               (GtkPrinter              *printer,
  								    GtkPrintSettings        *settings,
  								    GtkPageSetup            *page_setup,
  								    GtkPrintCapabilities     capabilities);
  static void                 file_printer_prepare_for_print         (GtkPrinter              *printer,
  								    GtkPrintJob             *print_job,
  								    GtkPrintSettings        *settings,
  								    GtkPageSetup            *page_setup);
  static void                 gtk_print_backend_file_print_stream    (GtkPrintBackend         *print_backend,
  								    GtkPrintJob             *job,
  								    GIOChannel              *data_io,
  								    GtkPrintJobCompleteFunc  callback,
  								    gpointer                 user_data,
  								    GDestroyNotify           dnotify);
  static cairo_surface_t *    file_printer_create_cairo_surface      (GtkPrinter              *printer,
  								    GtkPrintSettings        *settings,
  								    gdouble                  width,
  								    gdouble                  height,
  								    GIOChannel              *cache_io);
  
  static GList *              file_printer_list_papers               (GtkPrinter              *printer);
  static GtkPageSetup *       file_printer_get_default_page_size     (GtkPrinter              *printer);
  
  static void
  gtk_print_backend_file_register_type (GTypeModule *module)
  {
    const GTypeInfo print_backend_file_info =
    {
      sizeof (GtkPrintBackendFileClass),
      NULL,		/* base_init */
      NULL,		/* base_finalize */
      (GClassInitFunc) gtk_print_backend_file_class_init,
      NULL,		/* class_finalize */
      NULL,		/* class_data */
      sizeof (GtkPrintBackendFile),
      0,		/* n_preallocs */
      (GInstanceInitFunc) gtk_print_backend_file_init,
    };
  
    print_backend_file_type = g_type_module_register_type (module,
                                                           GTK_TYPE_PRINT_BACKEND,
                                                           "GtkPrintBackendFile",
                                                           &print_backend_file_info, 0);
  }
  
  G_MODULE_EXPORT void 
  pb_module_init (GTypeModule *module)
  {
    gtk_print_backend_file_register_type (module);
  }
  
  G_MODULE_EXPORT void 
  pb_module_exit (void)
  {
  
  }
    
  G_MODULE_EXPORT GtkPrintBackend * 
  pb_module_create (void)
  {
    return gtk_print_backend_file_new ();
  }
  
  /*
   * GtkPrintBackendFile
   */
  GType
  gtk_print_backend_file_get_type (void)
  {
    return print_backend_file_type;
  }
  
  /**
   * gtk_print_backend_file_new:
   *
   * Creates a new #GtkPrintBackendFile object. #GtkPrintBackendFile
   * implements the #GtkPrintBackend interface with direct access to
   * the filesystem using Unix/Linux API calls
   *
   * Returns: the new #GtkPrintBackendFile object
   **/
  GtkPrintBackend *
  gtk_print_backend_file_new (void)
  {
    return g_object_new (GTK_TYPE_PRINT_BACKEND_FILE, NULL);
  }
  
  static void
  gtk_print_backend_file_class_init (GtkPrintBackendFileClass *class)
  {
    GtkPrintBackendClass *backend_class = GTK_PRINT_BACKEND_CLASS (class);
  
    backend_parent_class = g_type_class_peek_parent (class);
  
    backend_class->print_stream = gtk_print_backend_file_print_stream;
    backend_class->printer_create_cairo_surface = file_printer_create_cairo_surface;
    backend_class->printer_get_options = file_printer_get_options;
    backend_class->printer_get_settings_from_options = file_printer_get_settings_from_options;
    backend_class->printer_prepare_for_print = file_printer_prepare_for_print;
    backend_class->printer_list_papers = file_printer_list_papers;
    backend_class->printer_get_default_page_size = file_printer_get_default_page_size;
  }
  
  /* return N_FORMATS if no explicit format in the settings */
  static OutputFormat
  format_from_settings (GtkPrintSettings *settings)
  {
    const gchar *value;
    gint i;
  
    if (settings == NULL)
      return N_FORMATS;
  
    value = gtk_print_settings_get (settings,
                                    GTK_PRINT_SETTINGS_OUTPUT_FILE_FORMAT);
    if (value == NULL)
      return N_FORMATS;
  
    for (i = 0; i < N_FORMATS; ++i)
      if (strcmp (value, formats[i]) == 0)
        break;
  
    g_assert (i < N_FORMATS);
  
    return (OutputFormat) i;
  }
  
  static gchar *
  output_file_from_settings (GtkPrintSettings *settings,
  			   const gchar      *default_format)
  {
    gchar *uri = NULL;
  
    if (settings)
      uri = g_strdup (gtk_print_settings_get (settings, GTK_PRINT_SETTINGS_OUTPUT_URI));
  
    if (uri == NULL)
      { 
        const gchar *extension, *basename = NULL, *output_dir = NULL;
        gchar *name, *locale_name, *path;
  
        if (default_format)
          extension = default_format;
        else
          {
            OutputFormat format;
  
            format = format_from_settings (settings);
            switch (format)
              {
                default:
                case FORMAT_PDF:
                  extension = "pdf";
                  break;
                case FORMAT_PS:
                  extension = "ps";
                  break;
                case FORMAT_SVG:
                  extension = "svg";
                  break;
              }
          }
  
        if (settings)
          basename = gtk_print_settings_get (settings, GTK_PRINT_SETTINGS_OUTPUT_BASENAME);
        if (basename == NULL)
          basename = _("output");
  
        name = g_strconcat (basename, ".", extension, NULL);
  
        locale_name = g_filename_from_utf8 (name, -1, NULL, NULL, NULL);
        g_free (name);
  
        if (locale_name != NULL)
          {
            if (settings)
              output_dir = gtk_print_settings_get (settings, GTK_PRINT_SETTINGS_OUTPUT_DIR);
            if (output_dir == NULL)
              {
                const gchar *document_dir = g_get_user_special_dir (G_USER_DIRECTORY_DOCUMENTS);
  
                if (document_dir == NULL)
                  {
                    gchar *current_dir = g_get_current_dir ();
                    path = g_build_filename (current_dir, locale_name, NULL);
                    g_free (current_dir);
                  }
                else
                  path = g_build_filename (document_dir, locale_name, NULL);
  
                uri = g_filename_to_uri (path, NULL, NULL); 
  	    }
            else
              {
                path = g_build_filename (output_dir, locale_name, NULL);
                uri = g_filename_to_uri (path, NULL, NULL);
              }
  
            g_free (path); 
            g_free (locale_name);
          }
      }
  
    return uri;
  }
  
  static cairo_status_t
  _cairo_write (void                *closure,
                const unsigned char *data,
                unsigned int         length)
  {
    GIOChannel *io = (GIOChannel *)closure;
    gsize written = 0;
    GError *error;
  
    error = NULL;
  
    GTK_NOTE (PRINTING,
              g_print ("FILE Backend: Writting %i byte chunk to temp file\n", length));
  
    while (length > 0) 
      {
        GIOStatus status;
  
        status = g_io_channel_write_chars (io, (const gchar *) data, length, &written, &error);
  
        if (status == G_IO_STATUS_ERROR)
          {
            if (error != NULL)
              {
                GTK_NOTE (PRINTING,
                          g_print ("FILE Backend: Error writting to temp file, %s\n", error->message));
  
                g_error_free (error);
              }
  
  	  return CAIRO_STATUS_WRITE_ERROR;
  	}    
  
        GTK_NOTE (PRINTING,
                  g_print ("FILE Backend: Wrote %i bytes to temp file\n", written));
        
        data += written;
        length -= written;
      }
  
    return CAIRO_STATUS_SUCCESS;
  }
  
  
  static cairo_surface_t *
  file_printer_create_cairo_surface (GtkPrinter       *printer,
  				   GtkPrintSettings *settings,
  				   gdouble           width, 
  				   gdouble           height,
  				   GIOChannel       *cache_io)
  {
    cairo_surface_t *surface;
    OutputFormat format;
    const cairo_svg_version_t *versions;
    int num_versions = 0;
  
    format = format_from_settings (settings);
  
    switch (format)
      {
        default:
        case FORMAT_PDF:
          surface = cairo_pdf_surface_create_for_stream (_cairo_write, cache_io, width, height);
          break;
        case FORMAT_PS:
          surface = cairo_ps_surface_create_for_stream (_cairo_write, cache_io, width, height);
          break;
        case FORMAT_SVG:
          surface = cairo_svg_surface_create_for_stream (_cairo_write, cache_io, width, height);
          cairo_svg_get_versions (&versions, &num_versions);
          if (num_versions > 0)
            cairo_svg_surface_restrict_to_version (surface, versions[num_versions - 1]);
          break;
      }
  
    cairo_surface_set_fallback_resolution (surface,
                                           2.0 * gtk_print_settings_get_printer_lpi (settings),
                                           2.0 * gtk_print_settings_get_printer_lpi (settings));
  
    return surface;
  }
  
  typedef struct {
    GtkPrintBackend *backend;
    GtkPrintJobCompleteFunc callback;
    GtkPrintJob *job;
    GFileOutputStream *target_io_stream;
    gpointer user_data;
    GDestroyNotify dnotify;
  } _PrintStreamData;
  
  /* expects GDK lock to be held */
  static void
  file_print_cb_locked (GtkPrintBackendFile *print_backend,
                        GError              *error,
                        gpointer            user_data)
  {
    gchar *uri;
  
    _PrintStreamData *ps = (_PrintStreamData *) user_data;
    GtkRecentManager *recent_manager;
  
    if (ps->target_io_stream != NULL)
      g_output_stream_close (G_OUTPUT_STREAM (ps->target_io_stream), NULL, NULL);
  
    if (ps->callback)
      ps->callback (ps->job, ps->user_data, error);
  
    if (ps->dnotify)
      ps->dnotify (ps->user_data);
  
    gtk_print_job_set_status (ps->job,
  			    (error != NULL)?GTK_PRINT_STATUS_FINISHED_ABORTED:GTK_PRINT_STATUS_FINISHED);
  
    recent_manager = gtk_recent_manager_get_default ();
    uri = output_file_from_settings (gtk_print_job_get_settings (ps->job), NULL);
    gtk_recent_manager_add_item (recent_manager, uri);
    g_free (uri);
  
    if (ps->job)
      g_object_unref (ps->job);
  
    g_free (ps);
  }
  
  static void
  file_print_cb (GtkPrintBackendFile *print_backend,
                 GError              *error,
                 gpointer            user_data)
  {
    gdk_threads_enter ();
  
    file_print_cb_locked (print_backend, error, user_data);
  
    gdk_threads_leave ();
  }
  
  static gboolean
  file_write (GIOChannel   *source,
              GIOCondition  con,
              gpointer      user_data)
  {
    gchar buf[_STREAM_MAX_CHUNK_SIZE];
    gsize bytes_read;
    GError *error;
    GIOStatus read_status;
    _PrintStreamData *ps = (_PrintStreamData *) user_data;
  
    error = NULL;
  
    read_status =
      g_io_channel_read_chars (source,
                               buf,
                               _STREAM_MAX_CHUNK_SIZE,
                               &bytes_read,
                               &error);
  
    if (read_status != G_IO_STATUS_ERROR)
      {
        gsize bytes_written;
  
        g_output_stream_write_all (G_OUTPUT_STREAM (ps->target_io_stream),
                                   buf,
                                   bytes_read,
                                   &bytes_written,
                                   NULL,
                                   &error);
      }
  
    if (error != NULL || read_status == G_IO_STATUS_EOF)
      {
        file_print_cb (GTK_PRINT_BACKEND_FILE (ps->backend), error, user_data);
  
        if (error != NULL)
          {
            GTK_NOTE (PRINTING,
                      g_print ("FILE Backend: %s\n", error->message));
  
            g_error_free (error);
          }
  
        return FALSE;
      }
  
    GTK_NOTE (PRINTING,
              g_print ("FILE Backend: Writting %i byte chunk to target file\n", bytes_read));
  
    return TRUE;
  }
  
  static void
  gtk_print_backend_file_print_stream (GtkPrintBackend        *print_backend,
  				     GtkPrintJob            *job,
  				     GIOChannel             *data_io,
  				     GtkPrintJobCompleteFunc callback,
  				     gpointer                user_data,
  				     GDestroyNotify          dnotify)
  {
    GError *internal_error = NULL;
    _PrintStreamData *ps;
    GtkPrintSettings *settings;
    gchar *uri;
    GFile *file = NULL;
  
    settings = gtk_print_job_get_settings (job);
  
    ps = g_new0 (_PrintStreamData, 1);
    ps->callback = callback;
    ps->user_data = user_data;
    ps->dnotify = dnotify;
    ps->job = g_object_ref (job);
    ps->backend = print_backend;
  
    internal_error = NULL;
    uri = output_file_from_settings (settings, NULL);
  
    if (uri == NULL)
      goto error;
  
    file = g_file_new_for_uri (uri);
    ps->target_io_stream = g_file_replace (file, NULL, FALSE, G_FILE_CREATE_NONE, NULL, &internal_error);
  
    g_object_unref (file);
    g_free (uri);
  
  error:
    if (internal_error != NULL)
      {
        file_print_cb_locked (GTK_PRINT_BACKEND_FILE (print_backend),
                              internal_error, ps);
  
        g_error_free (internal_error);
        return;
      }
  
    g_io_add_watch (data_io, 
                    G_IO_IN | G_IO_PRI | G_IO_ERR | G_IO_HUP,
                    (GIOFunc) file_write,
                    ps);
  }
  
  static void
  gtk_print_backend_file_init (GtkPrintBackendFile *backend)
  {
    GtkPrinter *printer;
    
    printer = g_object_new (GTK_TYPE_PRINTER,
  			  "name", _("Print to File"),
  			  "backend", backend,
  			  "is-virtual", TRUE,
  			  "accepts-pdf", TRUE,
  			  NULL); 
  
    gtk_printer_set_has_details (printer, TRUE);
    gtk_printer_set_icon_name (printer, "document-save");
    gtk_printer_set_is_active (printer, TRUE);
  
    gtk_print_backend_add_printer (GTK_PRINT_BACKEND (backend), printer);
    g_object_unref (printer);
  
    gtk_print_backend_set_list_done (GTK_PRINT_BACKEND (backend));
  }
  
  typedef struct {
    GtkPrinter          *printer;
    GtkPrinterOptionSet *set;
  } _OutputFormatChangedData;
  
  static void
  set_printer_format_from_option_set (GtkPrinter          *printer,
  				    GtkPrinterOptionSet *set)
  {
    GtkPrinterOption *format_option;
    const gchar *value;
    gint i;
  
    format_option = gtk_printer_option_set_lookup (set, "output-file-format");
    if (format_option && format_option->value)
      {
        value = format_option->value;
        if (value)
          {
  	  for (i = 0; i < N_FORMATS; ++i)
  	    if (strcmp (value, formats[i]) == 0)
  	      break;
  
  	  g_assert (i < N_FORMATS);
  
  	  switch (i)
  	    {
  	      case FORMAT_PDF:
  		gtk_printer_set_accepts_pdf (printer, TRUE);
  		gtk_printer_set_accepts_ps (printer, FALSE);
  		break;
  	      case FORMAT_PS:
  		gtk_printer_set_accepts_pdf (printer, FALSE);
  		gtk_printer_set_accepts_ps (printer, TRUE);
  		break;
  	      case FORMAT_SVG:
  	      default:
  		gtk_printer_set_accepts_pdf (printer, FALSE);
  		gtk_printer_set_accepts_ps (printer, FALSE);
  		break;
  	    }
  	}
      }
  }
  
  static void
  file_printer_output_file_format_changed (GtkPrinterOption    *format_option,
  					 gpointer             user_data)
  {
    GtkPrinterOption *uri_option;
    gchar            *base = NULL;
    _OutputFormatChangedData *data = (_OutputFormatChangedData *) user_data;
  
    if (! format_option->value)
      return;
  
    uri_option = gtk_printer_option_set_lookup (data->set,
                                                "gtk-main-page-custom-input");
  
    if (uri_option && uri_option->value)
      {
        const gchar *uri = uri_option->value;
        const gchar *dot = strrchr (uri, '.');
  
        if (dot)
          {
            gint i;
  
            /*  check if the file extension matches one of the known ones  */
            for (i = 0; i < N_FORMATS; i++)
              if (strcmp (dot + 1, formats[i]) == 0)
                break;
  
            if (i < N_FORMATS && strcmp (formats[i], format_option->value))
              {
                /*  the file extension is known but doesn't match the
                 *  selected one, strip it away
                 */
                base = g_strndup (uri, dot - uri);
              }
          }
        else
          {
            /*  there's no file extension  */
            base = g_strdup (uri);
          }
      }
  
    if (base)
      {
        gchar *tmp = g_strdup_printf ("%s.%s", base, format_option->value);
  
        gtk_printer_option_set (uri_option, tmp);
        g_free (tmp);
        g_free (base);
      }
  
    set_printer_format_from_option_set (data->printer, data->set);
  }
  
  static GtkPrinterOptionSet *
  file_printer_get_options (GtkPrinter           *printer,
  			  GtkPrintSettings     *settings,
  			  GtkPageSetup         *page_setup,
  			  GtkPrintCapabilities  capabilities)
  {
    GtkPrinterOptionSet *set;
    GtkPrinterOption *option;
    const gchar *n_up[] = {"1", "2", "4", "6", "9", "16" };
    const gchar *pages_per_sheet = NULL;
    const gchar *format_names[N_FORMATS] = { N_("PDF"), N_("Postscript"), N_("SVG") };
    const gchar *supported_formats[N_FORMATS];
    gchar *display_format_names[N_FORMATS];
    gint n_formats = 0;
    OutputFormat format;
    gchar *uri;
    gint current_format = 0;
    _OutputFormatChangedData *format_changed_data;
  
    format = format_from_settings (settings);
  
    set = gtk_printer_option_set_new ();
  
    option = gtk_printer_option_new ("gtk-n-up", _("Pages per _sheet:"), GTK_PRINTER_OPTION_TYPE_PICKONE);
    gtk_printer_option_choices_from_array (option, G_N_ELEMENTS (n_up),
  					 (char **) n_up, (char **) n_up /* FIXME i18n (localised digits)! */);
    if (settings)
      pages_per_sheet = gtk_print_settings_get (settings, GTK_PRINT_SETTINGS_NUMBER_UP);
    if (pages_per_sheet)
      gtk_printer_option_set (option, pages_per_sheet);
    else
      gtk_printer_option_set (option, "1");
    gtk_printer_option_set_add (set, option);
    g_object_unref (option);
  
    if (capabilities & (GTK_PRINT_CAPABILITY_GENERATE_PDF | GTK_PRINT_CAPABILITY_GENERATE_PS))
      {
        if (capabilities & GTK_PRINT_CAPABILITY_GENERATE_PDF)
          {
  	  if (format == FORMAT_PDF || format == N_FORMATS)
              {
                format = FORMAT_PDF;
  	      current_format = n_formats;
              }
            supported_formats[n_formats] = formats[FORMAT_PDF];
  	  display_format_names[n_formats] = _(format_names[FORMAT_PDF]);
  	  n_formats++;
  	}
        if (capabilities & GTK_PRINT_CAPABILITY_GENERATE_PS)
          {
  	  if (format == FORMAT_PS || format == N_FORMATS)
  	    current_format = n_formats;
            supported_formats[n_formats] = formats[FORMAT_PS];
            display_format_names[n_formats] = _(format_names[FORMAT_PS]);
  	  n_formats++;
  	}
      }
    else
      {
        switch (format)
          {
            default:
            case FORMAT_PDF:
              current_format = FORMAT_PDF;
              break;
            case FORMAT_PS:
              current_format = FORMAT_PS;
              break;
            case FORMAT_SVG:
              current_format = FORMAT_SVG;            
              break;
          }
  
        for (n_formats = 0; n_formats < N_FORMATS; ++n_formats)
          {
  	  supported_formats[n_formats] = formats[n_formats];
            display_format_names[n_formats] = _(format_names[n_formats]);
  	}
      }
  
    uri = output_file_from_settings (settings, supported_formats[current_format]);
  
    option = gtk_printer_option_new ("gtk-main-page-custom-input", _("File"), 
  				   GTK_PRINTER_OPTION_TYPE_FILESAVE);
    gtk_printer_option_set_activates_default (option, TRUE);
    gtk_printer_option_set (option, uri);
    g_free (uri);
    option->group = g_strdup ("GtkPrintDialogExtension");
    gtk_printer_option_set_add (set, option);
  
    if (n_formats > 1)
      {
        option = gtk_printer_option_new ("output-file-format", _("_Output format"), 
  				       GTK_PRINTER_OPTION_TYPE_ALTERNATIVE);
        option->group = g_strdup ("GtkPrintDialogExtension");
  
        gtk_printer_option_choices_from_array (option, n_formats,
  					     (char **) supported_formats,
  					     display_format_names);
        gtk_printer_option_set (option, supported_formats[current_format]);
        gtk_printer_option_set_add (set, option);
  
        set_printer_format_from_option_set (printer, set);
        format_changed_data = g_new (_OutputFormatChangedData, 1);
        format_changed_data->printer = printer;
        format_changed_data->set = set;
        g_signal_connect_data (option, "changed",
  			     G_CALLBACK (file_printer_output_file_format_changed),
  			     format_changed_data, (GClosureNotify)g_free, 0);
  
        g_object_unref (option);
      }
  
    return set;
  }
  
  static void
  file_printer_get_settings_from_options (GtkPrinter          *printer,
  					GtkPrinterOptionSet *options,
  					GtkPrintSettings    *settings)
  {
    GtkPrinterOption *option;
  
    option = gtk_printer_option_set_lookup (options, "gtk-main-page-custom-input");
    gtk_print_settings_set (settings, GTK_PRINT_SETTINGS_OUTPUT_URI, option->value);
  
    option = gtk_printer_option_set_lookup (options, "output-file-format");
    if (option)
      gtk_print_settings_set (settings, GTK_PRINT_SETTINGS_OUTPUT_FILE_FORMAT, option->value);
  
    option = gtk_printer_option_set_lookup (options, "gtk-n-up");
    if (option)
      gtk_print_settings_set (settings, GTK_PRINT_SETTINGS_NUMBER_UP, option->value);
  
    option = gtk_printer_option_set_lookup (options, "gtk-n-up-layout");
    if (option)
      gtk_print_settings_set (settings, GTK_PRINT_SETTINGS_NUMBER_UP_LAYOUT, option->value);
  }
  
  static void
  file_printer_prepare_for_print (GtkPrinter       *printer,
  				GtkPrintJob      *print_job,
  				GtkPrintSettings *settings,
  				GtkPageSetup     *page_setup)
  {
    gdouble scale;
    GtkPrintPages pages;
    GtkPageRange *ranges;
    gint n_ranges;
    OutputFormat format;
  
    pages = gtk_print_settings_get_print_pages (settings);
    gtk_print_job_set_pages (print_job, pages);
  
    if (pages == GTK_PRINT_PAGES_RANGES)
      ranges = gtk_print_settings_get_page_ranges (settings, &n_ranges);
    else
      {
        ranges = NULL;
        n_ranges = 0;
      }
  
    gtk_print_job_set_page_ranges (print_job, ranges, n_ranges);
    gtk_print_job_set_collate (print_job, gtk_print_settings_get_collate (settings));
    gtk_print_job_set_reverse (print_job, gtk_print_settings_get_reverse (settings));
    gtk_print_job_set_num_copies (print_job, gtk_print_settings_get_n_copies (settings));
    gtk_print_job_set_n_up (print_job, gtk_print_settings_get_number_up (settings));
    gtk_print_job_set_n_up_layout (print_job, gtk_print_settings_get_number_up_layout (settings));
  
    scale = gtk_print_settings_get_scale (settings);
    if (scale != 100.0)
      gtk_print_job_set_scale (print_job, scale / 100.0);
  
    gtk_print_job_set_page_set (print_job, gtk_print_settings_get_page_set (settings));
  
    format = format_from_settings (settings);
    switch (format)
      {
        case FORMAT_PDF:
  	gtk_print_job_set_rotate (print_job, FALSE);
          break;
        default:
        case FORMAT_PS:
        case FORMAT_SVG:
  	gtk_print_job_set_rotate (print_job, TRUE);
          break;
      }
  }
  
  static GList *
  file_printer_list_papers (GtkPrinter *printer)
  {
    GList *result = NULL;
    GList *papers, *p;
    GtkPageSetup *page_setup;
  
    papers = gtk_paper_size_get_paper_sizes (FALSE);
  
    for (p = papers; p; p = p->next)
      {
        GtkPaperSize *paper_size = p->data;
  
        page_setup = gtk_page_setup_new ();
        gtk_page_setup_set_paper_size (page_setup, paper_size);
        gtk_paper_size_free (paper_size);
        result = g_list_prepend (result, page_setup);
      }
  
    g_list_free (papers);
  
    return g_list_reverse (result);
  }
  
  static GtkPageSetup *
  file_printer_get_default_page_size (GtkPrinter *printer)
  {
    GtkPageSetup *result = NULL;
  
    return result;
  }
  