[gtk+] cssprovider: Cache if rulesets have inheritable style properties

[Benjamin Otte <otte src gnome org>]

commit 8111d99183bbe3f10ba4260d319925ae1fc6b96e
Author: Benjamin Otte <otte redhat com>
Date:   Wed May 18 05:47:18 2011 +0200

    cssprovider: Cache if rulesets have inheritable style properties
    
    This provides a huge speedup as we only need to preprocess style
    properties when they are indeed inherited. This roughly doubles the
    performance of the CSS matcher and brings the time taken by
    gtk_css_provider_get_style() from 19% to 7% in my favorite benchmark.

 gtk/gtkcssprovider.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkcssprovider.c b/gtk/gtkcssprovider.c
index 8dcb09a..8659247 100644
--- a/gtk/gtkcssprovider.c
+++ b/gtk/gtkcssprovider.c
@@ -745,6 +745,8 @@ struct GtkCssRuleset
   GtkCssSelector *selector;
   GHashTable *widget_style;
   GHashTable *style;
+
+  guint has_inherit :1;
 };
 
 struct _GtkCssScanner
@@ -970,6 +972,7 @@ gtk_css_ruleset_add (GtkCssRuleset *ruleset,
                                             NULL,
                                             (GDestroyNotify) property_value_free);
 
+  ruleset->has_inherit |= gtk_style_param_get_inherit (pspec);
   g_hash_table_insert (ruleset->style, pspec, value);
 }
 
@@ -1158,7 +1161,7 @@ gtk_css_provider_get_style (GtkStyleProvider *provider,
           if (ruleset->style == NULL)
             continue;
 
-          if (l < length && _gtk_css_selector_get_state_flags (ruleset->selector))
+          if (l < length && (!ruleset->has_inherit || _gtk_css_selector_get_state_flags (ruleset->selector)))
             continue;
 
           if (!gtk_css_ruleset_matches (ruleset, path, l))