Avoid pointless clutter scene graph updateshack

For some reason bvw_update_tags gets called constantly even when nothing
is changing. And each call seems to trigger a clutter scene graph update,
which seems to occupy significant real time if not CPU time.

By avoiding pointless updates, rendering is now smoother.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/backend/bacon-video-widget.c b/src/backend/bacon-video-widget.c
index a8a5dba..5808bd9 100644
--- a/src/backend/bacon-video-widget.c
+++ b/src/backend/bacon-video-widget.c
@@ -2063,12 +2063,15 @@ bvw_update_tags (BaconVideoWidget * bvw, GstTagList *tag_list, const gchar *type
   GstTagList **cache = NULL;
   GstTagList *result;
 
-  GST_DEBUG ("Tags: %" GST_PTR_FORMAT, tag_list);
-
   /* all tags (replace previous tags, title/artist/etc. might change
    * in the middle of a stream, e.g. with radio streams) */
   result = gst_tag_list_merge (bvw->priv->tagcache, tag_list,
                                    GST_TAG_MERGE_REPLACE);
+  if (gst_tag_list_is_equal (result, bvw->priv->tagcache)) {
+    gst_tag_list_unref (result);
+    return;
+  }
+  GST_DEBUG ("Tags: %" GST_PTR_FORMAT, tag_list);
   if (bvw->priv->tagcache)
     gst_tag_list_unref (bvw->priv->tagcache);
   bvw->priv->tagcache = result;