[gtk/matthiasc/css-matching-4: 2/2] wip: quick per-frame css node stats

[Matthias Clasen <matthiasc src gnome org>]

commit 468387c88c3431192127d484c9e68b0092361574
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jan 20 16:19:09 2020 -0500

    wip: quick per-frame css node stats
    
    Just print out the time that a toplevel css node takes
    to validate, as well as the number of invalidated nodes,
    created and cached styles.

 gtk/gtkcssnode.c | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkcssnode.c b/gtk/gtkcssnode.c
index 4fe350d5ff..fdb5fb1f9c 100644
--- a/gtk/gtkcssnode.c
+++ b/gtk/gtkcssnode.c
@@ -122,6 +122,13 @@ gtk_css_node_get_style_provider_or_null (GtkCssNode *cssnode)
   return GTK_CSS_NODE_GET_CLASS (cssnode)->get_style_provider (cssnode);
 }
 
+#define GTK_CSS_NODE_ACCOUNTING
+#ifdef GTK_CSS_NODE_ACCOUNTING
+static int invalidated_nodes;
+static int created_styles;
+static int cached_styles;
+#endif
+
 static void
 gtk_css_node_set_invalid (GtkCssNode *node,
                           gboolean    invalid)
@@ -131,6 +138,11 @@ gtk_css_node_set_invalid (GtkCssNode *node,
 
   node->invalid = invalid;
 
+#ifdef GTK_CSS_NODE_ACCOUNTING
+  if (invalid)
+    invalidated_nodes++;
+#endif
+
   if (node->visible)
     {
       if (node->parent)
@@ -367,7 +379,16 @@ gtk_css_node_create_style (GtkCssNode   *cssnode,
 
   style = lookup_in_global_parent_cache (cssnode, decl);
   if (style)
-    return g_object_ref (style);
+    {
+#ifdef GTK_CSS_NODE_ACCOUNTING
+      cached_styles++;
+#endif
+      return g_object_ref (style);
+    }
+
+#ifdef GTK_CSS_NODE_ACCOUNTING
+  created_styles++;
+#endif
 
   parent = cssnode->parent ? cssnode->parent->style : NULL;
 
@@ -1379,10 +1400,27 @@ void
 gtk_css_node_validate (GtkCssNode *cssnode)
 {
   gint64 timestamp;
+#ifdef GTK_CSS_NODE_ACCOUNTING
+  gint64 before = g_get_monotonic_time ();
+#endif
 
   timestamp = gtk_css_node_get_timestamp (cssnode);
 
   gtk_css_node_validate_internal (cssnode, timestamp);
+
+#ifdef GTK_CSS_NODE_ACCOUNTING
+  if (cssnode->parent == NULL)
+    {
+      g_print ("%g ms, nodes invalidated %d, styles created %d, cached %d\n",
+               ((double)(g_get_monotonic_time () - before)) / G_TIME_SPAN_MILLISECOND,
+                invalidated_nodes, created_styles, cached_styles);
+      invalidated_nodes = 0;
+      created_styles = 0;
+      cached_styles = 0;
+      if (g_getenv ("GTK_CSS_DEBUG_EXIT_AFTER_VALIDATE"))
+        exit (0);
+    }
+#endif
 }
 
 gboolean