backends/native: Implement support for pointer barriers

When running as a dispay server pointer barriers are a server side
feature and requires no client interaction of any sort. This patch
implements pointer barriers that can be used when running as a display
server on the native backend. Running as a display server using the X11
backend is currently not supported.

https://bugzilla.gnome.org/show_bug.cgi?id=706655

src/backends/native/meta-backend-native.c

@@ -24,10 +24,13 @@
 
 #include "config.h"
 
+#include "meta-backend-native.h"
+#include "meta-backend-native-private.h"
+
 #include <meta/main.h>
 #include <clutter/evdev/clutter-evdev.h>
-#include "meta-backend-native.h"
 
+#include "meta-barrier-native.h"
 #include "meta-idle-monitor-native.h"
 #include "meta-monitor-manager-kms.h"
 #include "meta-cursor-renderer-native.h"
@@ -36,6 +39,10 @@
 struct _MetaBackendNativePrivate
 {
   MetaLauncher *launcher;
+
+  MetaBarrierManagerNative *barrier_manager;
+
+  GSettings *keyboard_settings;
 };
 typedef struct _MetaBackendNativePrivate MetaBackendNativePrivate;
 
@@ -52,6 +59,22 @@ meta_backend_native_finalize (GObject *object)
   G_OBJECT_CLASS (meta_backend_native_parent_class)->finalize (object);
 }
 
+static void
+constrain_to_barriers (ClutterInputDevice *device,
+                       guint32             time,
+                       float              *new_x,
+                       float              *new_y)
+{
+  MetaBackendNative *native = META_BACKEND_NATIVE (meta_get_backend ());
+  MetaBackendNativePrivate *priv =
+    meta_backend_native_get_instance_private (native);
+
+  meta_barrier_manager_native_process (priv->barrier_manager,
+                                       device,
+                                       time,
+                                       new_x, new_y);
+}
+
 /*
  * The pointer constrain code is mostly a rip-off of the XRandR code from Xorg.
  * (from xserver/randr/rrcrtc.c, RRConstrainCursorHarder)
@@ -141,6 +164,9 @@ pointer_constrain_callback (ClutterInputDevice *device,
   unsigned int n_monitors;
   gboolean ret;
 
+  /* Constrain to barriers */
+  constrain_to_barriers (device, time, new_x, new_y);
+
   monitor_manager = meta_monitor_manager_get ();
   monitors = meta_monitor_manager_get_monitor_infos (monitor_manager, &n_monitors);
 
@@ -269,6 +295,8 @@ meta_backend_native_init (MetaBackendNative *native)
 
   /* We're a display server, so start talking to weston-launch. */
   priv->launcher = meta_launcher_new ();
+
+  priv->barrier_manager = meta_barrier_manager_native_new ();
 }
 
 gboolean
@@ -281,6 +309,15 @@ meta_activate_vt (int vt, GError **error)
   return meta_launcher_activate_vt (priv->launcher, vt, error);
 }
 
+MetaBarrierManagerNative *
+meta_backend_native_get_barrier_manager (MetaBackendNative *native)
+{
+  MetaBackendNativePrivate *priv =
+    meta_backend_native_get_instance_private (native);
+
+  return priv->barrier_manager;
+}
+
 /**
  * meta_activate_session:
  *