[gnome-control-center] background: Fix memory corruption when creating preview

[Bastien Nocera <hadess src gnome org>]

commit 1097d4ca754ec0a340bc26127808a901e6d78a94
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Aug 19 23:40:26 2013 +0200

    background: Fix memory corruption when creating preview
    
    When using a single screen, the captured area was too small, and
    we were copying data from out-of-bounds of the pixbuf area.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=696166

 panels/background/cc-background-panel.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)
---
diff --git a/panels/background/cc-background-panel.c b/panels/background/cc-background-panel.c
index 480cd73..14fa244 100644
--- a/panels/background/cc-background-panel.c
+++ b/panels/background/cc-background-panel.c
@@ -256,8 +256,6 @@ on_screenshot_finished (GObject *source,
   cairo_surface_t *surface;
   cairo_t *cr;
   GVariant *result;
-  int width;
-  int height;
 
   error = NULL;
   result = g_dbus_connection_call_finish (G_DBUS_CONNECTION (source),
@@ -288,10 +286,8 @@ on_screenshot_finished (GObject *source,
       goto out;
     }
 
-  width = gdk_pixbuf_get_width (pixbuf);
-  height = gdk_pixbuf_get_height (pixbuf);
   surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
-                                        width, height);
+                                        data->monitor_rect.width, data->monitor_rect.height);
   cr = cairo_create (surface);
   gdk_cairo_set_source_pixbuf (cr, pixbuf, data->capture_rect.x, data->capture_rect.y);
   cairo_paint (cr);