+ const gchar *inptr, *start;
+ GString *final;
+
+ g_return_val_if_fail (cmd != NULL, NULL);
+ g_return_val_if_fail (pdf_filename != NULL, NULL);
+ g_return_val_if_fail (settings_filename != NULL, NULL);
+
+ final = g_string_new (NULL);
+
+ *pdf_filename_replaced = FALSE;
+ *settings_filename_replaced = FALSE;
+
+ start = inptr = cmd;
+ while ((inptr = strchr (inptr, '%')) != NULL)
+ {
+ g_string_append_len (final, start, inptr - start);
+ inptr++;
+ switch (*inptr)
+ {
+ case 'f':
+ g_string_append (final, pdf_filename);
+ *pdf_filename_replaced = TRUE;
+ break;
+
+ case 's':
+ g_string_append (final, settings_filename);
+ *settings_filename_replaced = TRUE;
+ break;
+
+ case '%':
+ g_string_append_c (final, '%');
+ break;
+
+ default:
+ g_string_append_c (final, '%');
+ if (*inptr)
+ g_string_append_c (final, *inptr);
+ break;
+ }
+ if (*inptr)
+ inptr++;
+ start = inptr;
+ }
+ g_string_append (final, start);
+
+ return g_string_free (final, FALSE);
+}
+
+void
+_gtk_print_operation_platform_backend_launch_preview (GtkPrintOperation *op,
+ cairo_surface_t *surface,
+ GtkWindow *parent,
+ const gchar *filename)
+{
+ GAppInfo *appinfo;
+ GdkAppLaunchContext *context;
+ gchar *cmd;
+ gchar *preview_cmd;
+ GtkSettings *settings;
+ GtkPrintSettings *print_settings = NULL;
+ GtkPageSetup *page_setup;
+ GKeyFile *key_file = NULL;
+ gchar *data = NULL;
+ gsize data_len;
+ gchar *settings_filename = NULL;
+ gchar *quoted_filename;
+ gchar *quoted_settings_filename;
+ gboolean filename_used = FALSE;
+ gboolean settings_used = FALSE;
+ GdkScreen *screen;
+ GError *error = NULL;
+ gint fd;
+ gboolean retval;
+
+ cairo_surface_destroy (surface);
+
+ if (parent)
+ screen = gtk_window_get_screen (parent);
+ else
+ screen = gdk_screen_get_default ();
+
+ fd = g_file_open_tmp ("settingsXXXXXX.ini", &settings_filename, &error);
+ if (fd < 0)
+ goto out;
+
+ key_file = g_key_file_new ();
+
+ print_settings = gtk_print_settings_copy (gtk_print_operation_get_print_settings (op));
+
+ if (print_settings != NULL)
+ {
+ gtk_print_settings_set_reverse (print_settings, FALSE);
+ gtk_print_settings_set_page_set (print_settings, GTK_PAGE_SET_ALL);
+ gtk_print_settings_set_scale (print_settings, 1.0);
+ gtk_print_settings_set_number_up (print_settings, 1);
+ gtk_print_settings_set_number_up_layout (print_settings, GTK_NUMBER_UP_LAYOUT_LEFT_TO_RIGHT_TOP_TO_BOTTOM);
+
+ /* These removals are neccessary because cups-* settings have higher priority
+ * than normal settings.
+ */
+ gtk_print_settings_unset (print_settings, "cups-reverse");
+ gtk_print_settings_unset (print_settings, "cups-page-set");
+ gtk_print_settings_unset (print_settings, "cups-scale");
+ gtk_print_settings_unset (print_settings, "cups-number-up");
+ gtk_print_settings_unset (print_settings, "cups-number-up-layout");
+
+ gtk_print_settings_to_key_file (print_settings, key_file, NULL);
+ g_object_unref (print_settings);
+ }
+
+ page_setup = gtk_print_context_get_page_setup (op->priv->print_context);
+ gtk_page_setup_to_key_file (page_setup, key_file, NULL);
+
+ g_key_file_set_string (key_file, "Print Job", "title", op->priv->job_name);
+
+ data = g_key_file_to_data (key_file, &data_len, &error);
+ if (!data)
+ goto out;
+
+ retval = g_file_set_contents (settings_filename, data, data_len, &error);
+ if (!retval)
+ goto out;
+
+ settings = gtk_settings_get_for_screen (screen);
+ g_object_get (settings, "gtk-print-preview-command", &preview_cmd, NULL);
+
+ quoted_filename = g_shell_quote (filename);
+ quoted_settings_filename = g_shell_quote (settings_filename);
+ cmd = shell_command_substitute_file (preview_cmd, quoted_filename, quoted_settings_filename, &filename_used, &settings_used);
+
+ appinfo = g_app_info_create_from_commandline (cmd,
+ "Print Preview",
+ G_APP_INFO_CREATE_NONE,
+ &error);
+
+ g_free (preview_cmd);
+ g_free (quoted_filename);
+ g_free (quoted_settings_filename);
+ g_free (cmd);
+
+ if (error != NULL)
+ goto out;