[mutter] MetaMonitorManager: Add API turning monitor index into logical monitor

[Jonas Ådahl <jadahl src gnome org>]

commit e659b07c39eb40ad10cf5cb401956d1f7e5216cc
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue Nov 29 11:46:41 2016 +0800

    MetaMonitorManager: Add API turning monitor index into logical monitor
    
    This is the current equivalent of looking up the logical monitor in the
    logical monitor array using the number, but eventually that will be
    deprecated, and before that done differently, so add a temporary helper
    for the places that has not been ported yet.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777732

 src/backends/meta-monitor-manager-private.h |    3 +++
 src/backends/meta-monitor-manager.c         |    9 +++++++++
 2 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/src/backends/meta-monitor-manager-private.h b/src/backends/meta-monitor-manager-private.h
index f36a7a5..d576450 100644
--- a/src/backends/meta-monitor-manager-private.h
+++ b/src/backends/meta-monitor-manager-private.h
@@ -368,6 +368,9 @@ int                 meta_monitor_manager_get_num_logical_monitors (MetaMonitorMa
 MetaLogicalMonitor *meta_monitor_manager_get_logical_monitors (MetaMonitorManager *manager,
                                                                unsigned int       *n_logical_monitors);
 
+MetaLogicalMonitor *meta_monitor_manager_get_logical_monitor_from_number (MetaMonitorManager *manager,
+                                                                          int                 number);
+
 MetaLogicalMonitor *meta_monitor_manager_get_primary_logical_monitor (MetaMonitorManager *manager);
 
 MetaOutput         *meta_monitor_manager_get_outputs       (MetaMonitorManager *manager,
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index e81eb7e..d2cafb1 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -1315,6 +1315,15 @@ meta_monitor_manager_get_logical_monitors (MetaMonitorManager *manager,
 }
 
 MetaLogicalMonitor *
+meta_monitor_manager_get_logical_monitor_from_number (MetaMonitorManager *manager,
+                                                      int                 number)
+{
+  g_assert (number < (int) manager->n_logical_monitors);
+
+  return &manager->logical_monitors[number];
+}
+
+MetaLogicalMonitor *
 meta_monitor_manager_get_primary_logical_monitor (MetaMonitorManager *manager)
 {
   return manager->primary_logical_monitor;