[mutter] monitor: Determine preferred monitor mode

[Jonas Ådahl <jadahl src gnome org>]

commit 2c32d94e1d2065758cf445c0773e453e390c90fe
Author: Jonas Ådahl <jadahl gmail com>
Date:   Sat Dec 17 22:32:05 2016 +0800

    monitor: Determine preferred monitor mode
    
    Determine the preferred monitor mode given what the preferred CRTC mode
    is, and expose it via the API.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777732

 src/backends/meta-monitor.c |   14 ++++++++++++++
 src/backends/meta-monitor.h |    2 ++
 2 files changed, 16 insertions(+), 0 deletions(-)
---
diff --git a/src/backends/meta-monitor.c b/src/backends/meta-monitor.c
index 7fa0094..a3fd155 100644
--- a/src/backends/meta-monitor.c
+++ b/src/backends/meta-monitor.c
@@ -37,6 +37,8 @@ typedef struct _MetaMonitorPrivate
   GList *outputs;
   GList *modes;
 
+  MetaMonitorMode *preferred_mode;
+
   /*
    * The primary or first output for this monitor, 0 if we can't figure out.
    * It can be matched to a winsys_id of a MetaOutput.
@@ -187,6 +189,9 @@ meta_monitor_normal_generate_modes (MetaMonitorNormal *monitor_normal)
         .crtc_mode = crtc_mode
       };
 
+      if (crtc_mode == output->preferred_mode)
+        monitor_priv->preferred_mode = mode;
+
       monitor_priv->modes = g_list_append (monitor_priv->modes, mode);
     }
 }
@@ -365,6 +370,7 @@ meta_monitor_tiled_generate_modes (MetaMonitorTiled *monitor_tiled)
     }
 
   monitor_priv->modes = g_list_append (monitor_priv->modes, mode);
+  monitor_priv->preferred_mode = mode;
 
   /* TODO: Add single tile modes */
 }
@@ -446,6 +452,14 @@ meta_monitor_mode_free (MetaMonitorMode *monitor_mode)
   g_free (monitor_mode);
 }
 
+MetaMonitorMode *
+meta_monitor_get_preferred_mode (MetaMonitor *monitor)
+{
+  MetaMonitorPrivate *priv = meta_monitor_get_instance_private (monitor);
+
+  return priv->preferred_mode;
+}
+
 GList *
 meta_monitor_get_modes (MetaMonitor *monitor)
 {
diff --git a/src/backends/meta-monitor.h b/src/backends/meta-monitor.h
index ec33984..3bab0a3 100644
--- a/src/backends/meta-monitor.h
+++ b/src/backends/meta-monitor.h
@@ -96,6 +96,8 @@ const char * meta_monitor_get_product (MetaMonitor *monitor);
 
 uint32_t meta_monitor_tiled_get_tile_group_id (MetaMonitorTiled *monitor_tiled);
 
+MetaMonitorMode * meta_monitor_get_preferred_mode (MetaMonitor *monitor);
+
 GList * meta_monitor_get_modes (MetaMonitor *monitor);
 
 MetaMonitorModeSpec * meta_monitor_mode_get_spec (MetaMonitorMode *monitor_mode);