[mutter] monitor: Add API to get monitor mode from spec

[Jonas Ådahl <jadahl src gnome org>]

commit 4c1b48d0ccad527c067a2d4e3f3da6939ceca8d2
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Dec 21 13:03:35 2016 +0800

    monitor: Add API to get monitor mode from spec
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777732

 src/backends/meta-monitor.c |   29 +++++++++++++++++++++++++++++
 src/backends/meta-monitor.h |    3 +++
 2 files changed, 32 insertions(+), 0 deletions(-)
---
diff --git a/src/backends/meta-monitor.c b/src/backends/meta-monitor.c
index 11c0faf..ed1f661 100644
--- a/src/backends/meta-monitor.c
+++ b/src/backends/meta-monitor.c
@@ -539,6 +539,35 @@ meta_monitor_get_spec (MetaMonitor *monitor)
   return priv->spec;
 }
 
+static gboolean
+meta_monitor_mode_spec_equals (MetaMonitorModeSpec *monitor_mode_spec,
+                               MetaMonitorModeSpec *other_monitor_mode_spec)
+{
+  return (monitor_mode_spec->width == other_monitor_mode_spec->width &&
+          monitor_mode_spec->height == other_monitor_mode_spec->height &&
+          (monitor_mode_spec->refresh_rate ==
+           other_monitor_mode_spec->refresh_rate));
+}
+
+MetaMonitorMode *
+meta_monitor_get_mode_from_spec (MetaMonitor         *monitor,
+                                 MetaMonitorModeSpec *monitor_mode_spec)
+{
+  MetaMonitorPrivate *priv = meta_monitor_get_instance_private (monitor);
+  GList *l;
+
+  for (l = priv->modes; l; l = l->next)
+    {
+      MetaMonitorMode *monitor_mode = l->data;
+
+      if (meta_monitor_mode_spec_equals (monitor_mode_spec,
+                                         &monitor_mode->spec))
+        return monitor_mode;
+    }
+
+  return NULL;
+}
+
 MetaMonitorMode *
 meta_monitor_get_preferred_mode (MetaMonitor *monitor)
 {
diff --git a/src/backends/meta-monitor.h b/src/backends/meta-monitor.h
index f39b3f4..9c6211e 100644
--- a/src/backends/meta-monitor.h
+++ b/src/backends/meta-monitor.h
@@ -109,6 +109,9 @@ const char * meta_monitor_get_product (MetaMonitor *monitor);
 
 uint32_t meta_monitor_tiled_get_tile_group_id (MetaMonitorTiled *monitor_tiled);
 
+MetaMonitorMode * meta_monitor_get_mode_from_spec (MetaMonitor         *monitor,
+                                                   MetaMonitorModeSpec *monitor_mode_spec);
+
 MetaMonitorMode * meta_monitor_get_preferred_mode (MetaMonitor *monitor);
 
 GList * meta_monitor_get_modes (MetaMonitor *monitor);