clutter: Do not poke backend code for motion compression

We now have all info available in ClutterEvent, use it and stop poking
backend internals.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1623>

3 files changed, 27 insertions, 28 deletions

diff --git a/clutter/clutter/clutter-seat.c b/clutter/clutter/clutter-seat.c
index f4309787c..1908fda12 100644
--- a/clutter/clutter/clutter-seat.c
+++ b/clutter/clutter/clutter-seat.c
@@ -607,21 +607,6 @@ clutter_seat_get_supported_virtual_device_types (ClutterSeat *seat)
   return seat_class->get_supported_virtual_device_types (seat);
 }
 
-void
-clutter_seat_compress_motion (ClutterSeat        *seat,
-                              ClutterEvent       *event,
-                              const ClutterEvent *to_discard)
-{
-  ClutterSeatClass *seat_class;
-
-  g_return_if_fail (CLUTTER_IS_SEAT (seat));
-
-  seat_class = CLUTTER_SEAT_GET_CLASS (seat);
-
-  if (seat_class->compress_motion)
-    seat_class->compress_motion (seat, event, to_discard);
-}
-
 gboolean
 clutter_seat_handle_event_post (ClutterSeat        *seat,
                                 const ClutterEvent *event)
diff --git a/clutter/clutter/clutter-seat.h b/clutter/clutter/clutter-seat.h
index 135789588..5c5dfe6eb 100644
--- a/clutter/clutter/clutter-seat.h
+++ b/clutter/clutter/clutter-seat.h
@@ -84,10 +84,6 @@ struct _ClutterSeatClass
 
   ClutterKeymap * (* get_keymap) (ClutterSeat *seat);
 
-  void (* compress_motion) (ClutterSeat        *seat,
-                            ClutterEvent       *event,
-                            const ClutterEvent *to_discard);
-
   gboolean (* handle_event_post) (ClutterSeat        *seat,
                                   const ClutterEvent *event);
 
@@ -151,10 +147,6 @@ ClutterVirtualInputDevice *clutter_seat_create_virtual_device (ClutterSeat
 CLUTTER_EXPORT
 ClutterVirtualDeviceType clutter_seat_get_supported_virtual_device_types (ClutterSeat *seat);
 
-void clutter_seat_compress_motion (ClutterSeat        *seat,
-                                   ClutterEvent       *event,
-                                   const ClutterEvent *to_discard);
-
 CLUTTER_EXPORT
 void clutter_seat_warp_pointer (ClutterSeat *seat,
                                 int          x,
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index af6c413ba..fd12c0381 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -687,6 +687,32 @@ _clutter_stage_has_queued_events (ClutterStage *stage)
   return priv->event_queue->length > 0;
 }
 
+static void
+clutter_stage_compress_motion (ClutterStage       *stage,
+                               ClutterEvent       *event,
+                               const ClutterEvent *to_discard)
+{
+  double dx, dy;
+  double dx_unaccel, dy_unaccel;
+  double dst_dx = 0.0, dst_dy = 0.0;
+  double dst_dx_unaccel = 0.0, dst_dy_unaccel = 0.0;
+
+  if (!clutter_event_get_relative_motion (to_discard,
+                                          &dx, &dy,
+                                          &dx_unaccel, &dy_unaccel))
+    return;
+
+  clutter_event_get_relative_motion (event,
+                                     &dst_dx, &dst_dy,
+                                     &dst_dx_unaccel, &dst_dy_unaccel);
+
+  event->motion.flags |= CLUTTER_EVENT_FLAG_RELATIVE_MOTION;
+  event->motion.dx = dx + dst_dx;
+  event->motion.dy = dy + dst_dy;
+  event->motion.dx_unaccel = dx_unaccel + dst_dx_unaccel;
+  event->motion.dy_unaccel = dy_unaccel + dst_dy_unaccel;
+}
+
 void
 _clutter_stage_process_queued_events (ClutterStage *stage)
 {
@@ -754,11 +780,7 @@ _clutter_stage_process_queued_events (ClutterStage *stage)
                             (int) event->motion.y);
 
               if (next_event->type == CLUTTER_MOTION)
-                {
-                  ClutterSeat *seat = clutter_input_device_get_seat (device);
-
-                  clutter_seat_compress_motion (seat, next_event, event);
-                }
+                clutter_stage_compress_motion (stage, next_event, event);
 
               goto next_event;
             }