[gnome-control-center/wip/jsparber/background: 35/58] [feat] use cached pixbuf if the preview size didn't change

[Julian Sparber <jsparber src gnome org>]

commit a24302b89c9e6a190a635a76dfd490bbd2ed8747
Author: Julian Sparber <julian sparber net>
Date:   Wed Nov 8 19:41:29 2017 +0100

    [feat] use cached pixbuf if the preview size didn't change

 panels/background/cc-background-panel.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/panels/background/cc-background-panel.c b/panels/background/cc-background-panel.c
index 265cd23..ff6d3c9 100644
--- a/panels/background/cc-background-panel.c
+++ b/panels/background/cc-background-panel.c
@@ -177,8 +177,10 @@ get_or_create_cached_pixbuf (CcBackgroundPanel *panel,
   const gint preview_height = gtk_widget_get_allocated_height (widget);
 
   pixbuf = g_object_get_data (G_OBJECT (background), "pixbuf");
-  if (pixbuf == NULL)
-    {
+  if (pixbuf == NULL ||
+      gdk_pixbuf_get_width (pixbuf) != preview_width ||
+      gdk_pixbuf_get_height (pixbuf) != preview_height) {
+
       gtk_widget_get_allocation (widget, &allocation);
       scale_factor = gtk_widget_get_scale_factor (widget);
       pixbuf = cc_background_item_get_frame_thumbnail (background,
@@ -187,7 +189,7 @@ get_or_create_cached_pixbuf (CcBackgroundPanel *panel,
                                                        preview_height,
                                                        scale_factor,
                                                        -2, TRUE);
-      //g_object_set_data_full (G_OBJECT (background), "pixbuf", pixbuf, g_object_unref);
+      g_object_set_data_full (G_OBJECT (background), "pixbuf", pixbuf, g_object_unref);
     }
 
   return pixbuf;