backends/x11: add a flag to denote randr 1.5 is in use.

If the server reports randr 1.5, just cache the information
for later patches to use.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/backends/x11/meta-monitor-manager-xrandr.c b/src/backends/x11/meta-monitor-manager-xrandr.c
index d9505926..c4064ad1 100644
--- a/src/backends/x11/meta-monitor-manager-xrandr.c
+++ b/src/backends/x11/meta-monitor-manager-xrandr.c
@@ -58,6 +58,7 @@ struct _MetaMonitorManagerXrandr
   XRRScreenResources *resources;
   int rr_event_base;
   int rr_error_base;
+  gboolean has_randr15;
 };
 
 struct _MetaMonitorManagerXrandrClass
@@ -1173,6 +1174,7 @@ meta_monitor_manager_xrandr_init (MetaMonitorManagerXrandr *manager_xrandr)
     }
   else
     {
+      int major_version, minor_version;
       /* We only use ScreenChangeNotify, but GDK uses the others,
 	 and we don't want to step on its toes */
       XRRSelectInput (manager_xrandr->xdisplay,
@@ -1180,6 +1182,14 @@ meta_monitor_manager_xrandr_init (MetaMonitorManagerXrandr *manager_xrandr)
 		      RRScreenChangeNotifyMask
 		      | RRCrtcChangeNotifyMask
 		      | RROutputPropertyNotifyMask);
+
+      manager_xrandr->has_randr15 = FALSE;
+      XRRQueryVersion (manager_xrandr->xdisplay, &major_version,
+                       &minor_version);
+      if (major_version > 1 ||
+          (major_version == 1 &&
+           minor_version >= 5))
+        manager_xrandr->has_randr15 = TRUE;
     }
 }