[repaint] Run the repaint functions in clutter_redraw()

The clutter_redraw() function is used by libraries embedding
Clutter inside another toolkit, instead of queueing a redraw
on the embedded stage. This means that clutter_redraw() should
perform the same sequence of actions done by the redraw idle
callback.

clutter/clutter-main.c

@@ -174,14 +174,8 @@ _clutter_stage_maybe_setup_viewport (ClutterStage *stage)
     }
 }
 
-/**
- * clutter_redraw:
- *
- * Forces a redraw of the entire stage. Applications should never use this
- * function, but queue a redraw using clutter_actor_queue_redraw().
- */
 void
-clutter_redraw (ClutterStage *stage)
+_clutter_do_redraw (ClutterStage *stage)
 {
   ClutterMainContext *ctx;
   ClutterMasterClock *master_clock;
@@ -235,6 +229,32 @@ clutter_redraw (ClutterStage *stage)
   CLUTTER_TIMESTAMP (SCHEDULER, "Redraw finish for stage:%p", stage);
 }
 
+/**
+ * clutter_redraw:
+ *
+ * Forces a redraw of the entire stage. Applications should never use this
+ * function, but queue a redraw using clutter_actor_queue_redraw().
+ *
+ * This function should only be used by libraries integrating Clutter from
+ * within another toolkit.
+ */
+void
+clutter_redraw (ClutterStage *stage)
+{
+  ClutterMasterClock *master_clock;
+
+  /* we need to do this because the clutter_redraw() might be called by
+   * clutter-gtk, and this will not cause the master clock to advance nor
+   * the repaint functions to be run
+   */
+  master_clock = _clutter_master_clock_get_default ();
+  _clutter_master_clock_advance (master_clock);
+
+  _clutter_run_repaint_functions ();
+
+  _clutter_do_redraw (stage);
+}
+
 /**
  * clutter_set_motion_events_enabled:
  * @enable: %TRUE to enable per-actor motion events

clutter/clutter-private.h

@@ -211,6 +211,9 @@ ClutterActor *_clutter_do_pick (ClutterStage    *stage,
 				gint             y,
 				ClutterPickMode  mode);
 
+/* the actual redraw */
+void          _clutter_do_redraw (ClutterStage *stage);
+
 guint         _clutter_pixel_to_id (guchar pixel[4]);
 
 void          _clutter_id_to_color (guint id, ClutterColor *col);

clutter/clutter-stage.c

@@ -417,7 +417,7 @@ redraw_update_idle (gpointer user_data)
   CLUTTER_NOTE (PAINT, "Repaint functions");
   _clutter_run_repaint_functions ();
 
-  /* clutter_redraw() will also call maybe_relayout(), but since a relayout
+  /* clutter_do_redraw() will also call maybe_relayout(), but since a relayout
    * can queue a redraw, we want to do the relayout before we clear the
    * update_idle to avoid painting the stage twice. Calling maybe_relayout()
    * twice in a row is cheap because of caching of requested and allocated
@@ -427,7 +427,7 @@ redraw_update_idle (gpointer user_data)
 
   /* redrawing will advance the master clock */
   CLUTTER_NOTE (PAINT, "redrawing via idle for stage[%p]", stage);
-  clutter_redraw (stage);
+  _clutter_do_redraw (stage);
 
   /* reset the guard, so that new redraws are possible */
   priv->update_idle = 0;