From d9727290cfcbf68fe55bb29156a312b20ab9e615 Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Wed, 25 Feb 2015 18:25:01 +0100
Subject: [PATCH] cssnode: Special-case TIMESTAMP invalidations

Only invalidate timestamps if the node is marked as invalid. We overload
the meaning of "invalid" as "tracks timestamps".

While I don't like the way this is written, it is an important
optimization because 95+% of nodes don't animate so timestamps don't
matter to them. But timestamps are invalidated 60x per second.
---
 gtk/gtkcssnode.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gtk/gtkcssnode.c b/gtk/gtkcssnode.c
index 585ead7ea3..11200d84ef 100644
--- a/gtk/gtkcssnode.c
+++ b/gtk/gtkcssnode.c
@@ -860,6 +860,12 @@ void
 gtk_css_node_invalidate (GtkCssNode   *cssnode,
                          GtkCssChange  change)
 {
+  if (!cssnode->invalid)
+    change &= ~GTK_CSS_CHANGE_TIMESTAMP;
+
+  if (change == 0)
+    return;
+
   cssnode->pending_changes |= change;
 
   GTK_CSS_NODE_GET_CLASS (cssnode)->invalidate (cssnode);
-- 
2.30.2