[clutter/pick-each-frame] Update the devices inside a stage on every frame

[Emmanuele Bassi <ebassi src gnome org>]

commit 9d9c78a60a265e600ddf76d533bf88c755b49d15
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Wed Jul 20 12:09:54 2011 +0100

    Update the devices inside a stage on every frame
    
    This will update the actor underneath the pointer each time a new frame
    is started, thus allowing the emission of crossing event pairs if the
    scene changes without the pointer devices moving.
    
    http://bugzilla.clutter-project.org/show_bug.cgi?id=1273

 clutter/clutter-main.c         |    6 +++---
 clutter/clutter-master-clock.c |    5 ++++-
 clutter/clutter-stage.c        |   19 +++++++++++++++++++
 3 files changed, 26 insertions(+), 4 deletions(-)
---
diff --git a/clutter/clutter-main.c b/clutter/clutter-main.c
index 3a6bb11..49009e5 100644
--- a/clutter/clutter-main.c
+++ b/clutter/clutter-main.c
@@ -2085,7 +2085,7 @@ _clutter_process_event_details (ClutterActor        *stage,
 
             emit_pointer_event (event, device);
 
-            actor = _clutter_input_device_update (device, FALSE);
+            actor = device->cursor_actor;
             if (actor != stage)
               {
                 ClutterEvent *crossing;
@@ -2218,8 +2218,8 @@ _clutter_process_event_details (ClutterActor        *stage,
                * already have everything we need to update it and
                * get the actor underneath
                */
-              if (device != NULL)
-                actor = _clutter_input_device_update (device, TRUE);
+              if (G_LIKELY (device != NULL))
+                actor = device->cursor_actor;
               else
                 {
                   CLUTTER_NOTE (EVENT, "No device found: picking");
diff --git a/clutter/clutter-master-clock.c b/clutter/clutter-master-clock.c
index 1d67924..5f9112d 100644
--- a/clutter/clutter-master-clock.c
+++ b/clutter/clutter-master-clock.c
@@ -357,7 +357,10 @@ clutter_clock_dispatch (GSource     *source,
        * motion compression, and avoid multiple picks per frame.
        */
       if (_clutter_stage_get_pending_swaps (l->data) == 0)
-        _clutter_stage_process_queued_events (l->data);
+        {
+          _clutter_stage_update_input_devices (l->data);
+          _clutter_stage_process_queued_events (l->data);
+        }
     }
 
   CLUTTER_TIMER_STOP (_clutter_uprof_context, master_event_process);
diff --git a/clutter/clutter-stage.c b/clutter/clutter-stage.c
index 7e9beb3..1739153 100644
--- a/clutter/clutter-stage.c
+++ b/clutter/clutter-stage.c
@@ -4022,6 +4022,25 @@ _clutter_stage_has_device (ClutterStage       *stage,
   return g_hash_table_lookup (priv->devices, device) != NULL;
 }
 
+void
+_clutter_stage_update_input_devices (ClutterStage *stage)
+{
+  ClutterStagePrivate *priv = stage->priv;
+  GHashTableIter iter;
+  gpointer key, value;
+
+  if (!priv->motion_events_enabled)
+    return;
+
+  g_hash_table_iter_init (&iter, priv->devices);
+  while (g_hash_table_iter_next (&iter, &key, &value))
+    {
+      ClutterInputDevice *device = key;
+
+      _clutter_input_device_update (device, TRUE);
+    }
+}
+
 /**
  * clutter_stage_set_motion_events_enabled:
  * @stage: a #ClutterStage