[mutter] meta-monitor-manager: Add API to rotate the current configuration

[Rui Matos <rtcm src gnome org>]

commit 7360f51ee82f9202829b8b85807a9b2692308e8d
Author: Rui Matos <tiagomatos gmail com>
Date:   Thu May 4 14:25:47 2017 +0200

    meta-monitor-manager: Add API to rotate the current configuration
    
    This will allows us to support the XF86RotateWindows key present on
    some laptops directly in mutter.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781906

 src/backends/meta-monitor-manager-private.h |    2 +
 src/backends/meta-monitor-manager.c         |   29 +++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 0 deletions(-)
---
diff --git a/src/backends/meta-monitor-manager-private.h b/src/backends/meta-monitor-manager-private.h
index fa6c9c5..9fed7cf 100644
--- a/src/backends/meta-monitor-manager-private.h
+++ b/src/backends/meta-monitor-manager-private.h
@@ -554,6 +554,8 @@ gboolean           meta_monitor_manager_get_max_screen_size (MetaMonitorManager
 MetaLogicalMonitorLayoutMode
                    meta_monitor_manager_get_default_layout_mode (MetaMonitorManager *manager);
 
+void meta_monitor_manager_rotate_monitor (MetaMonitorManager *manager);
+
 void meta_monitor_manager_clear_output (MetaOutput *output);
 void meta_monitor_manager_clear_mode (MetaCrtcMode *mode);
 void meta_monitor_manager_clear_crtc (MetaCrtc *crtc);
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index ed07884..166d9a3 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -3255,3 +3255,32 @@ meta_monitor_manager_get_is_builtin_display_on (MetaMonitorManager *manager)
 
   return meta_monitor_is_active (laptop_panel);
 }
+
+void
+meta_monitor_manager_rotate_monitor (MetaMonitorManager *manager)
+{
+  if (!meta_is_monitor_config_manager_enabled ())
+    {
+      meta_monitor_config_rotate_monitor (manager->legacy_config);
+    }
+  else
+    {
+      GError *error = NULL;
+      MetaMonitorsConfig *config =
+        meta_monitor_config_manager_create_for_rotate_monitor (manager->config_manager);
+
+      if (!config)
+        return;
+
+      if (!meta_monitor_manager_apply_monitors_config (manager,
+                                                       config,
+                                                       META_MONITORS_CONFIG_METHOD_TEMPORARY,
+                                                       &error))
+        {
+          g_warning ("Failed to use rotate monitor configuration: %s",
+                     error->message);
+          g_error_free (error);
+        }
+      g_object_unref (config);
+    }
+}