--- trunk/src/osm-gps-map.h	2009/08/16 19:29:01	57
+++ trunk/src/osm-gps-map.h	2009/08/17 10:51:56	58
@@ -76,6 +76,14 @@
     OSM_GPS_MAP_SOURCE_YAHOO_HYBRID
 } OsmGpsMapSource_t;
 
+typedef struct {
+    gint x, y, w, h;
+} OsmGpsMapRect_t;
+
+typedef void (*OsmGpsMapBalloonCallback)(cairo_t *, OsmGpsMapRect_t *rect, 
+                                         gpointer data);
+#define	OSM_GPS_MAP_BALLOON_CALLBACK(f) ((OsmGpsMapBalloonCallback) (f))
+
 GType osm_gps_map_get_type (void) G_GNUC_CONST;
 
 const char* osm_gps_map_source_get_friendly_name(OsmGpsMapSource_t source);
@@ -107,7 +115,7 @@
                                        gint *pixel_x, gint *pixel_y);
 void osm_gps_map_scroll (OsmGpsMap *map, gint dx, gint dy);
 float osm_gps_map_get_scale(OsmGpsMap *map);
-void osm_gps_map_draw_balloon (OsmGpsMap *map, float latitude, float longitude);
+void osm_gps_map_draw_balloon (OsmGpsMap *map, float latitude, float longitude, OsmGpsMapBalloonCallback cb, gpointer data);
 void osm_gps_map_clear_balloon (OsmGpsMap *map);
 
 G_END_DECLS