+/* Destroy XR, which should have been created with xr_driver_create(). Any
+ cairo_t added to XR is not destroyed, because it is owned by the client. */
+void
+xr_driver_destroy (struct xr_driver *xr)
+{
+ if (xr != NULL)
+ {
+ xr->cairo = NULL;
+ output_driver_destroy (&xr->driver);
+ }
+}
+
+static struct xr_rendering *
+xr_rendering_create_text (struct xr_driver *xr, const char *text, cairo_t *cr)
+{
+ struct table_item *table_item;
+ struct xr_rendering *r;
+
+ table_item = table_item_create (table_from_string (0, text), NULL);
+ r = xr_rendering_create (xr, &table_item->output_item, cr);
+ table_item_unref (table_item);
+
+ return r;
+}
+
+struct xr_rendering *
+xr_rendering_create (struct xr_driver *xr, const struct output_item *item,
+ cairo_t *cr)
+{
+ struct xr_rendering *r = NULL;
+
+ if (is_text_item (item))
+ r = xr_rendering_create_text (xr, text_item_get_text (to_text_item (item)),
+ cr);
+ else if (is_message_item (item))
+ {
+ const struct message_item *message_item = to_message_item (item);
+ const struct msg *msg = message_item_get_msg (message_item);
+ char *s = msg_to_string (msg, NULL);
+ r = xr_rendering_create_text (xr, s, cr);
+ free (s);
+ }
+ else if (is_table_item (item))
+ {
+ r = xzalloc (sizeof *r);
+ r->xr = xr;
+ xr_set_cairo (xr, cr);
+ r->page = xr_render_table_item (xr, to_table_item (item),
+ &r->title_height);
+ }
+ else if (is_chart_item (item))
+ {
+ r = xzalloc (sizeof *r);
+ r->chart = to_chart_item (output_item_ref (item));
+ }
+
+ return r;
+}
+
+void
+xr_rendering_measure (struct xr_rendering *r, int *w, int *h)
+{
+ if (r->chart == NULL)
+ {
+ *w = render_page_get_size (r->page, H) / 1024;
+ *h = (render_page_get_size (r->page, V) + r->title_height) / 1024;
+ }
+ else
+ {
+ *w = CHART_WIDTH;
+ *h = CHART_HEIGHT;
+ }
+}
+
+/* Draws onto CR at least the region of R that is enclosed in (X,Y)-(X+W,Y+H),
+ and possibly some additional parts. */
+void
+xr_rendering_draw (struct xr_rendering *r, cairo_t *cr,
+ int x, int y, int w, int h)
+{
+ if (r->chart == NULL)
+ {
+ struct xr_driver *xr = r->xr;
+
+ xr_set_cairo (xr, cr);
+ xr->y = 0;
+ render_page_draw_region (r->page,
+ x * 1024, y * 1024, w * 1024, h * 1024);
+ }
+ else
+ xr_draw_chart (r->chart, cr, 0, 0, CHART_WIDTH, CHART_HEIGHT);
+}
+
+void
+xr_draw_chart (const struct chart_item *chart_item, cairo_t *cr,
+ double x, double y, double width, double height)
+{
+ struct xrchart_geometry geom;
+
+ cairo_save (cr);
+ cairo_translate (cr, x, y + height);
+ cairo_scale (cr, 1.0, -1.0);
+ xrchart_geometry_init (cr, &geom, width, height);
+ if (is_boxplot (chart_item))
+ xrchart_draw_boxplot (chart_item, cr, &geom);
+ else if (is_histogram_chart (chart_item))
+ xrchart_draw_histogram (chart_item, cr, &geom);
+ else if (is_np_plot_chart (chart_item))
+ xrchart_draw_np_plot (chart_item, cr, &geom);
+ else if (is_piechart (chart_item))
+ xrchart_draw_piechart (chart_item, cr, &geom);
+ else if (is_roc_chart (chart_item))
+ xrchart_draw_roc (chart_item, cr, &geom);
+ else if (is_scree (chart_item))
+ xrchart_draw_scree (chart_item, cr, &geom);
+ else
+ NOT_REACHED ();
+ xrchart_geometry_free (cr, &geom);
+
+ cairo_restore (cr);
+}
+
+char *
+xr_draw_png_chart (const struct chart_item *item,
+ const char *file_name_template, int number)