cssnode: Change the way we invalidate timestamps

Do not propagate the TIMESTAMP change through the node tree, as that
causes lots of uneeded markings of nodes as invalid.

Instead, walk the node tree and find the nodes that have a non-static
style and only invalidate timestamps on those.

1 files changed, 21 insertions, 4 deletions

diff --git a/gtk/gtkcssnode.c b/gtk/gtkcssnode.c
index 297068b486..547cfb91c9 100644
--- a/gtk/gtkcssnode.c
+++ b/gtk/gtkcssnode.c
@@ -841,6 +841,23 @@ gtk_css_node_invalidate_style_provider (GtkCssNode *cssnode)
     }
 }
 
+static void
+gtk_css_node_invalidate_timestamp (GtkCssNode *cssnode)
+{
+  GtkCssNode *child;
+
+  if (!cssnode->invalid)
+    return;
+
+  if (!gtk_css_style_is_static (cssnode->style))
+    gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_TIMESTAMP);
+
+  for (child = cssnode->first_child; child; child = child->next_sibling)
+    {
+      gtk_css_node_invalidate_timestamp (child);
+    }
+}
+
 void
 gtk_css_node_invalidate_frame_clock (GtkCssNode *cssnode,
                                      gboolean    just_timestamp)
@@ -849,10 +866,10 @@ gtk_css_node_invalidate_frame_clock (GtkCssNode *cssnode,
   if (cssnode->parent)
     return;
 
-  if (just_timestamp)
-    gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_TIMESTAMP);
-  else
-    gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_TIMESTAMP | GTK_CSS_CHANGE_ANIMATIONS);
+  gtk_css_node_invalidate_timestamp (cssnode);
+
+  if (!just_timestamp)
+    gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_ANIMATIONS);
 }
 
 void