[gtk+/wip/css-optimize2: 7/10] css: Short circuit gtk_css_value_initial_compute when possible

[Alexander Larsson <alexl src gnome org>]

commit 340c7f941934d653bf496c9dbd40a007cdb5ad96
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Dec 4 14:57:52 2012 +0100

    css: Short circuit gtk_css_value_initial_compute when possible
    
    For almost all properties the initial value does not need computing.
    If we skip computing these then gtk_css_value_initial_compute goes
    from > 6% to 2% in my testcase profiles.

 gtk/gtkcssinitialvalue.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcssinitialvalue.c b/gtk/gtkcssinitialvalue.c
index f4442f1..e604814 100644
--- a/gtk/gtkcssinitialvalue.c
+++ b/gtk/gtkcssinitialvalue.c
@@ -28,6 +28,7 @@
 struct _GtkCssValue {
   GTK_CSS_VALUE_BASE
   GtkCssStyleProperty *property;
+  gboolean needs_compute;
 };
 
 static void
@@ -47,6 +48,9 @@ gtk_css_value_initial_compute (GtkCssValue             *value,
 {
   GtkSettings *settings;
 
+  if (!value->needs_compute)
+    return _gtk_css_value_ref (_gtk_css_style_property_get_initial_value (value->property));
+
   switch (property_id)
     {
     case GTK_CSS_PROPERTY_FONT_FAMILY:
@@ -140,6 +144,8 @@ _gtk_css_initial_value_get (GtkCssStyleProperty *property)
       property->css_initial_value = g_new0 (GtkCssValue, 1);
       *property->css_initial_value = initial;
       property->css_initial_value->property = property;
+      property->css_initial_value->needs_compute =
+	_gtk_css_value_needs_compute (_gtk_css_style_property_get_initial_value (property));
     }
   return property->css_initial_value;
 }