[PATCH 9/15] gnome-control-center: Xrandr version checks

[Bryce Harrington <bryce canonical com>]

gnome-control-center:  107_cc-randr12-check-version.patch (LP: #198951,
#199549)

Another xrandr 1.2 version check.  Again, probably unnecessary on
Ubuntu/Fedora, but might be useful for GNOME generally.  (Maybe it could
be handled at a more centralized location though.)


diff -Nur -x '*.orig' -x '*~' gnome-control-center-2.22.1/capplets/display/xrandr-capplet.c gnome-control-center-2.22.1.new/capplets/display/xrandr-capplet.c
--- gnome-control-center-2.22.1/capplets/display/xrandr-capplet.c	2008-04-09 11:02:39.000000000 +0100
+++ gnome-control-center-2.22.1.new/capplets/display/xrandr-capplet.c	2008-04-09 11:02:40.000000000 +0100
@@ -1516,6 +1516,10 @@
 #define GLADE_FILE GNOMECC_GLADE_DIR "/display-capplet.glade"
     GladeXML *xml;
     GtkWidget *align;
+    int major, minor;
+    int event_base, error_base;
+    GdkDisplay *display;
+    Display    *xdisplay;
 
     xml = glade_xml_new (GLADE_FILE, NULL, NULL);
     if (!xml)
@@ -1523,7 +1527,40 @@
 	g_warning ("Could not open " GLADE_FILE);
 	return;
     }
-    
+
+    display = gdk_display_get_default ();
+    xdisplay = gdk_x11_display_get_xdisplay (display);
+
+    if (!XRRQueryExtension (xdisplay, &event_base, &error_base) ||
+        XRRQueryVersion (xdisplay, &major, &minor) == 0)
+    {
+        GtkWidget *dialog = gtk_message_dialog_new (
+                                                    NULL,
+                                                    GTK_DIALOG_DESTROY_WITH_PARENT,
+                                                    GTK_MESSAGE_WARNING,
+                                                    GTK_BUTTONS_OK,
+                                                    "The X Server does not support the XRandR extension.  Runtime resolution changes to the display size are not available."
+                                                    );
+        gtk_window_set_title (GTK_WINDOW (dialog), "");
+        gtk_dialog_run (GTK_DIALOG (dialog));
+        gtk_widget_destroy (dialog);
+        return;
+    }
+    else if (major != 1 || minor < 2)
+    {
+        GtkWidget *dialog = gtk_message_dialog_new (
+                                                    NULL,
+                                                    GTK_DIALOG_DESTROY_WITH_PARENT,
+                                                    GTK_MESSAGE_WARNING,
+                                                    GTK_BUTTONS_OK,
+                                                    "The version of the XRandR extension is incompatible with this program. Runtime changes to the display size are not available."
+                                                    );
+        gtk_window_set_title (GTK_WINDOW (dialog), "");
+        gtk_dialog_run (GTK_DIALOG (dialog));
+        gtk_widget_destroy (dialog);
+        return;
+    }
+
     app->screen = rw_screen_new (gdk_screen_get_default(),
 				 on_screen_changed, app);