[gtk+] widget: Don't queue redraws for properties that don't affect anything

[Jasper St. Pierre <jstpierre src gnome org>]

commit 4da945dc4be6bb1bd14000927c2092053cea3659
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sun Aug 2 12:37:03 2015 -0700

    widget: Don't queue redraws for properties that don't affect anything
    
    Properties like transition-property might change when hovering over
    something, even if the property itself does not change. These properties
    don't affect drawing, so don't queue redraws for them.

 gtk/gtkcsstypesprivate.h |    9 +++++++++
 gtk/gtkwidget.c          |    9 ++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkcsstypesprivate.h b/gtk/gtkcsstypesprivate.h
index 4018048..898051e 100644
--- a/gtk/gtkcsstypesprivate.h
+++ b/gtk/gtkcsstypesprivate.h
@@ -134,6 +134,15 @@ typedef enum {
   GTK_CSS_AFFECTS_SIZE = (1 << 9)
 } GtkCssAffects;
 
+#define GTK_CSS_AFFECTS_REDRAW (GTK_CSS_AFFECTS_FOREGROUND |    \
+                                GTK_CSS_AFFECTS_BACKGROUND |    \
+                                GTK_CSS_AFFECTS_BORDER |        \
+                                GTK_CSS_AFFECTS_FONT |          \
+                                GTK_CSS_AFFECTS_TEXT |          \
+                                GTK_CSS_AFFECTS_TEXT_ATTRS |    \
+                                GTK_CSS_AFFECTS_ICON |          \
+                                GTK_CSS_AFFECTS_OUTLINE)
+
 enum { /*< skip >*/
   GTK_CSS_PROPERTY_COLOR,
   GTK_CSS_PROPERTY_DPI,
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 37348ad..2f3b142 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -8250,14 +8250,17 @@ gtk_widget_real_style_updated (GtkWidget *widget)
 
       if (widget->priv->anchored)
         {
-          static GtkBitmask *affects_size = NULL;
+          static GtkBitmask *affects_size, *affects_redraw;
 
           if (G_UNLIKELY (affects_size == NULL))
-            affects_size = _gtk_css_style_property_get_mask_affecting (GTK_CSS_AFFECTS_SIZE | 
GTK_CSS_AFFECTS_CLIP);
+            {
+              affects_size = _gtk_css_style_property_get_mask_affecting (GTK_CSS_AFFECTS_SIZE | 
GTK_CSS_AFFECTS_CLIP);
+              affects_redraw = _gtk_css_style_property_get_mask_affecting (GTK_CSS_AFFECTS_REDRAW);
+            }
 
           if (changes == NULL || _gtk_bitmask_intersects (changes, affects_size))
             gtk_widget_queue_resize (widget);
-          else
+          else if (_gtk_bitmask_intersects (changes, affects_redraw))
             gtk_widget_queue_draw (widget);
         }
     }