~a-j-buxton/lightdm-gtk-greeter/background-fixes

            {

                p_width = gdk_pixbuf_get_width(bg);

                p_height = gdk_pixbuf_get_height(bg);

                scale = (double)monitor_geometry.width/p_width;

                height = p_height * scale;

                width = monitor_geometry.width;

                if (height < monitor_geometry.height)

                {

                    scale = (double)monitor_geometry.height/p_height;

                    height = monitor_geometry.height;

                    width = p_width * scale;

                }

                GdkPixbuf *p = gdk_pixbuf_scale_simple (bg, width,

                                                        height, GDK_INTERP_BILINEAR);

                if (width > monitor_geometry.width)

                {

                    p = gdk_pixbuf_new_subpixbuf(p, (width-monitor_geometry.width)/2, 0, monitor_geometry.width, monitor_geometry.height);

                }

                gdk_cairo_set_source_pixbuf (c, p, monitor_geometry.x, monitor_geometry.y);

                g_object_unref (p);

            }