timeline: Add more state accessors

It should be possible to ask a timeline what is its duration, taking
into account eventual repeats, and which repeat is the one currently
in progress.

These two functions allow writing animations that depend on the current
state of another timeline.

clutter/clutter-timeline.c

@@ -2174,3 +2174,57 @@ clutter_timeline_get_progress_mode (ClutterTimeline *timeline)
 
   return timeline->priv->progress_mode;
 }
+
+/**
+ * clutter_timeline_get_duration_hint:
+ * @timeline: a #ClutterTimeline
+ *
+ * Retrieves the full duration of the @timeline, taking into account the
+ * current value of the #ClutterTimeline:repeat-count property.
+ *
+ * If the #ClutterTimeline:repeat-count property is set to -1, this function
+ * will return %G_MAXINT64.
+ *
+ * The returned value is to be considered a hint, and it's only valid
+ * as long as the @timeline hasn't been changed.
+ *
+ * Return value: the full duration of the #ClutterTimeline
+ *
+ * Since: 1.10
+ */
+gint64
+clutter_timeline_get_duration_hint (ClutterTimeline *timeline)
+{
+  ClutterTimelinePrivate *priv;
+
+  g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0);
+
+  priv = timeline->priv;
+
+  if (priv->repeat_count == 0)
+    return priv->duration;
+  else if (priv->repeat_count < 0)
+    return G_MAXINT64;
+  else
+    return priv->repeat_count * priv->duration;
+}
+
+/**
+ * clutter_timeline_get_current_repeat:
+ * @timeline: a #ClutterTimeline
+ *
+ * Retrieves the current repeat for a timeline.
+ *
+ * Repeats start at 0.
+ *
+ * Return value: the current repeat
+ *
+ * Since: 1.10
+ */
+gint
+clutter_timeline_get_current_repeat (ClutterTimeline *timeline)
+{
+  g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), 0);
+
+  return timeline->priv->current_repeat;
+}