[gtk/static-style-getter] css: Add gtk_css_style_get_static_style

[Matthias Clasen <matthiasc src gnome org>]

commit b2b89f6c5765bc3731b83b4951b4603a70689437
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 12 22:44:58 2020 -0500

    css: Add gtk_css_style_get_static_style
    
    This lets us avoid poking directly at the GtkCssAnimatedStyle
    struct in gtkcssnode.c.

 gtk/gtkcssanimatedstyle.c | 10 ++++++++++
 gtk/gtkcssnode.c          | 11 ++---------
 gtk/gtkcssstyle.c         | 15 +++++++++++++++
 gtk/gtkcssstyleprivate.h  |  3 +++
 4 files changed, 30 insertions(+), 9 deletions(-)
---
diff --git a/gtk/gtkcssanimatedstyle.c b/gtk/gtkcssanimatedstyle.c
index 4aa82c0fe9..56a5e7b476 100644
--- a/gtk/gtkcssanimatedstyle.c
+++ b/gtk/gtkcssanimatedstyle.c
@@ -79,6 +79,15 @@ gtk_css_animated_style_is_static (GtkCssStyle *style)
   return TRUE;
 }
 
+static GtkCssStyle *
+gtk_css_animated_style_get_static_style (GtkCssStyle *style)
+{
+  /* This is called a lot, so we avoid a dynamic type check here */
+  GtkCssAnimatedStyle *animated = (GtkCssAnimatedStyle *) style;
+
+  return animated->style;
+}
+
 static void
 gtk_css_animated_style_dispose (GObject *object)
 {
@@ -123,6 +132,7 @@ gtk_css_animated_style_class_init (GtkCssAnimatedStyleClass *klass)
   style_class->get_value = gtk_css_animated_style_get_value;
   style_class->get_section = gtk_css_animated_style_get_section;
   style_class->is_static = gtk_css_animated_style_is_static;
+  style_class->get_static_style = gtk_css_animated_style_get_static_style;
 }
 
 static void
diff --git a/gtk/gtkcssnode.c b/gtk/gtkcssnode.c
index 7af6c7ab93..3dfb8e5a83 100644
--- a/gtk/gtkcssnode.c
+++ b/gtk/gtkcssnode.c
@@ -407,14 +407,7 @@ gtk_css_node_real_update_style (GtkCssNode   *cssnode,
 {
   GtkCssStyle *static_style, *new_static_style, *new_style;
 
-  if (GTK_IS_CSS_ANIMATED_STYLE (style))
-    {
-      static_style = GTK_CSS_ANIMATED_STYLE (style)->style;
-    }
-  else
-    {
-      static_style = style;
-    }
+  static_style = gtk_css_style_get_static_style (style);
 
   if (gtk_css_style_needs_recreation (static_style, change))
     new_static_style = gtk_css_node_create_style (cssnode);
@@ -436,7 +429,7 @@ gtk_css_node_real_update_style (GtkCssNode   *cssnode,
     }
   else if (static_style != style && (change & GTK_CSS_CHANGE_TIMESTAMP))
     {
-      new_style = gtk_css_animated_style_new_advance (GTK_CSS_ANIMATED_STYLE (style),
+      new_style = gtk_css_animated_style_new_advance ((GtkCssAnimatedStyle *)style,
                                                       static_style,
                                                       timestamp);
     }
diff --git a/gtk/gtkcssstyle.c b/gtk/gtkcssstyle.c
index 835a2b4213..53561657cb 100644
--- a/gtk/gtkcssstyle.c
+++ b/gtk/gtkcssstyle.c
@@ -53,11 +53,18 @@ gtk_css_style_real_is_static (GtkCssStyle *style)
   return TRUE;
 }
 
+static GtkCssStyle *
+gtk_css_style_real_get_static_style (GtkCssStyle *style)
+{
+  return style;
+}
+
 static void
 gtk_css_style_class_init (GtkCssStyleClass *klass)
 {
   klass->get_section = gtk_css_style_real_get_section;
   klass->is_static = gtk_css_style_real_is_static;
+  klass->get_static_style = gtk_css_style_real_get_static_style;
 }
 
 static void
@@ -89,6 +96,14 @@ gtk_css_style_is_static (GtkCssStyle *style)
   return GTK_CSS_STYLE_GET_CLASS (style)->is_static (style);
 }
 
+GtkCssStyle *
+gtk_css_style_get_static_style (GtkCssStyle *style)
+{
+  gtk_internal_return_val_if_fail (GTK_IS_CSS_STYLE (style), NULL);
+
+  return GTK_CSS_STYLE_GET_CLASS (style)->get_static_style (style);
+}
+
 /*
  * gtk_css_style_print:
  * @style: a #GtkCssStyle
diff --git a/gtk/gtkcssstyleprivate.h b/gtk/gtkcssstyleprivate.h
index c0add354ad..6c4fcd035b 100644
--- a/gtk/gtkcssstyleprivate.h
+++ b/gtk/gtkcssstyleprivate.h
@@ -56,6 +56,8 @@ struct _GtkCssStyleClass
                                                                  guint                   id);
   /* TRUE if this style will require changes based on timestamp */
   gboolean              (* is_static)                           (GtkCssStyle            *style);
+
+  GtkCssStyle *         (* get_static_style)                    (GtkCssStyle            *style);
 };
 
 GType                   gtk_css_style_get_type                  (void) G_GNUC_CONST;
@@ -74,6 +76,7 @@ gboolean                gtk_css_style_print                     (GtkCssStyle
 PangoAttrList *         gtk_css_style_get_pango_attributes      (GtkCssStyle            *style);
 
 PangoFontDescription *  gtk_css_style_get_pango_font            (GtkCssStyle            *style);
+GtkCssStyle *           gtk_css_style_get_static_style          (GtkCssStyle            *style);
 
 G_END_DECLS