[clutter] wayland: Use a fake millisecond monotonic time source for event times

[Rob Bradford <rbradford src gnome org>]

commit 3d646804d182d68a95fefd555ed9dbdc0898dc64
Author: Rob Bradford <rob linux intel com>
Date:   Thu Jun 27 16:01:56 2013 +0100

    wayland: Use a fake millisecond monotonic time source for event times
    
    The majority of Clutter input events require a time so that that the
    upper levels of abstraction can identify the ordering of events and also
    work out a click count.
    
    Although some Wayland events have microsecond timestamps not all those
    that Clutter expects do have. Therefore we would need to create some
    fake times for those events. Instead we always calculate our own time
    using the monotonic time.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=697285

 clutter/wayland/clutter-input-device-wayland.c |   23 +++++++++++++++++------
 1 files changed, 17 insertions(+), 6 deletions(-)
---
diff --git a/clutter/wayland/clutter-input-device-wayland.c b/clutter/wayland/clutter-input-device-wayland.c
index 404383b..bcf9dc7 100644
--- a/clutter/wayland/clutter-input-device-wayland.c
+++ b/clutter/wayland/clutter-input-device-wayland.c
@@ -57,6 +57,16 @@ G_DEFINE_TYPE (ClutterInputDeviceWayland,
                clutter_input_device_wayland,
                CLUTTER_TYPE_INPUT_DEVICE);
 
+/* This gives us a fake time source for higher level abstractions to have an
+ * understanding of when an event happens. All that matters are that this is a
+ * monotonic increasing millisecond accurate time for events to be compared with.
+ */
+static guint32
+_clutter_wayland_get_time (void)
+{
+  return g_get_monotonic_time () / 1000;
+}
+
 static void
 clutter_wayland_handle_motion (void *data,
                                struct wl_pointer *pointer,
@@ -70,7 +80,7 @@ clutter_wayland_handle_motion (void *data,
   event = clutter_event_new (CLUTTER_MOTION);
   event->motion.stage = stage_cogl->wrapper;
   event->motion.device = CLUTTER_INPUT_DEVICE (device);
-  event->motion.time = _time;
+  event->motion.time = _clutter_wayland_get_time();
   event->motion.modifier_state = 0;
   event->motion.x = wl_fixed_to_double(x);
   event->motion.y = wl_fixed_to_double(y);
@@ -100,7 +110,7 @@ clutter_wayland_handle_button (void *data,
   event = clutter_event_new (type);
   event->button.stage = stage_cogl->wrapper;
   event->button.device = CLUTTER_INPUT_DEVICE (device);
-  event->button.time = /*_time*/ serial;
+  event->button.time = _clutter_wayland_get_time();
   event->button.x = device->x;
   event->button.y = device->y;
   event->button.modifier_state =
@@ -135,7 +145,7 @@ clutter_wayland_handle_axis (void *data,
   gdouble                    delta_x, delta_y;
 
   event = clutter_event_new (CLUTTER_SCROLL);
-  event->scroll.time = time;
+  event->scroll.time = _clutter_wayland_get_time();
   event->scroll.stage = stage_cogl->wrapper;
   event->scroll.direction = CLUTTER_SCROLL_SMOOTH;
   event->scroll.x = device->x;
@@ -268,7 +278,8 @@ clutter_wayland_handle_key (void *data,
   event = _clutter_key_event_new_from_evdev ((ClutterInputDevice *) device,
                                              stage_cogl->wrapper,
                                              device->xkb,
-                                             _time, key, state);
+                                             _clutter_wayland_get_time(),
+                                             key, state);
 
   _clutter_event_push (event, FALSE);
 
@@ -337,7 +348,7 @@ clutter_wayland_handle_pointer_enter (void *data,
 
   event = clutter_event_new (CLUTTER_ENTER);
   event->crossing.stage = stage_cogl->wrapper;
-  event->crossing.time = 0; /* ?! */
+  event->crossing.time = _clutter_wayland_get_time();
   event->crossing.x = wl_fixed_to_double(x);
   event->crossing.y = wl_fixed_to_double(y);
   event->crossing.source = CLUTTER_ACTOR (stage_cogl->wrapper);
@@ -385,7 +396,7 @@ clutter_wayland_handle_pointer_leave (void *data,
 
   event = clutter_event_new (CLUTTER_LEAVE);
   event->crossing.stage = stage_cogl->wrapper;
-  event->crossing.time = 0; /* ?! */
+  event->crossing.time = _clutter_wayland_get_time();
   event->crossing.x = device->x;
   event->crossing.y = device->y;
   event->crossing.source = CLUTTER_ACTOR (stage_cogl->wrapper);