[gtk+] GtkWidget: Add a vfunc for queue_draw_region

[Alexander Larsson <alexl src gnome org>]

commit cb2882a273a380bd022b6a7adfc064c5bf04081a
Author: Alexander Larsson <alexl redhat com>
Date:   Thu May 2 11:08:10 2013 +0200

    GtkWidget: Add a vfunc for queue_draw_region
    
    Since widgets now cache drawn state we allow them to override
    queue_draw_region to detect when some region of the widget
    should be redrawn. For instance, if a widget draws the
    background color in a pixel cache we will need to invalidate
    that when the style context changes which queues a repaint.

 gtk/gtkwidget.c |   14 +++++++++++++-
 gtk/gtkwidget.h |    3 ++-
 2 files changed, 15 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 737d5b2..19e026a 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -751,6 +751,8 @@ static void             gtk_widget_real_get_width_for_height    (GtkWidget
                                                                  gint             *natural_width);
 static void             gtk_widget_real_state_flags_changed     (GtkWidget        *widget,
                                                                  GtkStateFlags     old_state);
+static void             gtk_widget_real_queue_draw_region       (GtkWidget         *widget,
+                                                                const cairo_region_t *region);
 static const GtkWidgetAuxInfo* _gtk_widget_get_aux_info_or_defaults (GtkWidget *widget);
 static GtkWidgetAuxInfo* gtk_widget_get_aux_info                (GtkWidget        *widget,
                                                                  gboolean          create);
@@ -1078,6 +1080,7 @@ gtk_widget_class_init (GtkWidgetClass *klass)
   klass->adjust_baseline_request = gtk_widget_real_adjust_baseline_request;
   klass->adjust_size_allocation = gtk_widget_real_adjust_size_allocation;
   klass->adjust_baseline_allocation = gtk_widget_real_adjust_baseline_allocation;
+  klass->queue_draw_region = gtk_widget_real_queue_draw_region;
 
   g_object_class_install_property (gobject_class,
                                   PROP_NAME,
@@ -4972,6 +4975,15 @@ gtk_widget_unrealize (GtkWidget *widget)
  * Draw queueing.
  *****************************************/
 
+static void
+gtk_widget_real_queue_draw_region (GtkWidget         *widget,
+                                  const cairo_region_t *region)
+{
+  GtkWidgetPrivate *priv = widget->priv;
+
+  gdk_window_invalidate_region (priv->window, region, TRUE);
+}
+
 /**
  * gtk_widget_queue_draw_region:
  * @widget: a #GtkWidget
@@ -5009,7 +5021,7 @@ gtk_widget_queue_draw_region (GtkWidget            *widget,
     if (!gtk_widget_get_mapped (w))
       return;
 
-  gdk_window_invalidate_region (priv->window, region, TRUE);
+  WIDGET_CLASS (widget)->queue_draw_region (widget, region);
 }
 
 /**
diff --git a/gtk/gtkwidget.h b/gtk/gtkwidget.h
index 0365e06..25247d5 100644
--- a/gtk/gtkwidget.h
+++ b/gtk/gtkwidget.h
@@ -444,13 +444,14 @@ struct _GtkWidgetClass
                                            gint              *natural_baseline);
   void         (* adjust_baseline_allocation) (GtkWidget         *widget,
                                               gint              *baseline);
+  void         (*queue_draw_region)           (GtkWidget         *widget,
+                                              const cairo_region_t *region);
 
   /*< private >*/
 
   GtkWidgetClassPrivate *priv;
 
   /* Padding for future expansion */
-  void (*_gtk_reserved5) (void);
   void (*_gtk_reserved6) (void);
   void (*_gtk_reserved7) (void);
 };