[mutter] wayland: discard non-seat events sent to the seat

[Ray Strode <halfline src gnome org>]

commit 673ddfde0443c08040060a5b6b2800a0d2726cb2
Author: Ray Strode <rstrode redhat com>
Date:   Wed Feb 18 10:43:18 2015 -0500

    wayland: discard non-seat events sent to the seat
    
    The wayland seat event handlers get sent events that
    aren't strictly interesting to them (such as events for
    hardware devices the seat doesn't support and events for
    virtual devices that the seat needs to ignore).
    
    This commit makes sure all uninteresting events get ignored.

 src/wayland/meta-wayland-seat.c |   48 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 48 insertions(+), 0 deletions(-)
---
diff --git a/src/wayland/meta-wayland-seat.c b/src/wayland/meta-wayland-seat.c
index ea7bd29..87525ac 100644
--- a/src/wayland/meta-wayland-seat.c
+++ b/src/wayland/meta-wayland-seat.c
@@ -242,10 +242,55 @@ meta_wayland_seat_free (MetaWaylandSeat *seat)
   g_slice_free (MetaWaylandSeat, seat);
 }
 
+static gboolean
+event_from_supported_hardware_device (MetaWaylandSeat    *seat,
+                                      const ClutterEvent *event)
+{
+  ClutterInputDevice     *input_device;
+  ClutterInputMode        input_mode;
+  ClutterInputDeviceType  device_type;
+  gboolean                hardware_device = FALSE;
+  gboolean                supported_device = FALSE;
+
+  input_device = clutter_event_get_source_device (event);
+
+  if (input_device == NULL)
+    goto out;
+
+  input_mode = clutter_input_device_get_device_mode (input_device);
+
+  if (input_mode != CLUTTER_INPUT_MODE_SLAVE)
+    goto out;
+
+  hardware_device = TRUE;
+
+  device_type = clutter_input_device_get_device_type (input_device);
+
+  switch (device_type)
+    {
+    case CLUTTER_TOUCHPAD_DEVICE:
+    case CLUTTER_POINTER_DEVICE:
+    case CLUTTER_KEYBOARD_DEVICE:
+    case CLUTTER_TOUCHSCREEN_DEVICE:
+      supported_device = TRUE;
+      break;
+
+    default:
+      supported_device = FALSE;
+      break;
+    }
+
+out:
+  return hardware_device && supported_device;
+}
+
 void
 meta_wayland_seat_update (MetaWaylandSeat    *seat,
                           const ClutterEvent *event)
 {
+  if (!event_from_supported_hardware_device (seat, event))
+    return;
+
   switch (event->type)
     {
     case CLUTTER_MOTION:
@@ -275,6 +320,9 @@ gboolean
 meta_wayland_seat_handle_event (MetaWaylandSeat *seat,
                                 const ClutterEvent *event)
 {
+  if (!event_from_supported_hardware_device (seat, event))
+    return FALSE;
+
   switch (event->type)
     {
     case CLUTTER_MOTION: