backends/native: Move relative motion filter to MetaSeatNative altogether

And drop the relative motion filter API. The seat will handle relative motion
across outputs with different scales. This accesses the MetaMonitorManager
ATM.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1486

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

@@ -137,120 +137,6 @@ pointer_constrain_callback (ClutterInputDevice *device,
   constrain_to_client_constraint (device, time, prev_x, prev_y, new_x, new_y);
 }
 
-static void
-relative_motion_across_outputs (MetaMonitorManager *monitor_manager,
-                                MetaLogicalMonitor *current,
-                                float               cur_x,
-                                float               cur_y,
-                                float              *dx_inout,
-                                float              *dy_inout)
-{
-  MetaLogicalMonitor *cur = current;
-  float x = cur_x, y = cur_y;
-  float target_x = cur_x, target_y = cur_y;
-  float dx = *dx_inout, dy = *dy_inout;
-  MetaDisplayDirection direction = -1;
-
-  while (cur)
-    {
-      MetaLine2 left, right, top, bottom, motion;
-      MetaVector2 intersection;
-
-      motion = (MetaLine2) {
-          .a = { x, y },
-            .b = { x + (dx * cur->scale), y + (dy * cur->scale) }
-      };
-      left = (MetaLine2) {
-            { cur->rect.x, cur->rect.y },
-              { cur->rect.x, cur->rect.y + cur->rect.height }
-      };
-      right = (MetaLine2) {
-            { cur->rect.x + cur->rect.width, cur->rect.y },
-              { cur->rect.x + cur->rect.width, cur->rect.y + cur->rect.height }
-      };
-      top = (MetaLine2) {
-            { cur->rect.x, cur->rect.y },
-              { cur->rect.x + cur->rect.width, cur->rect.y }
-      };
-      bottom = (MetaLine2) {
-            { cur->rect.x, cur->rect.y + cur->rect.height },
-              { cur->rect.x + cur->rect.width, cur->rect.y + cur->rect.height }
-      };
-
-      target_x = motion.b.x;
-      target_y = motion.b.y;
-
-      if (direction != META_DISPLAY_RIGHT &&
-          meta_line2_intersects_with (&motion, &left, &intersection))
-        direction = META_DISPLAY_LEFT;
-      else if (direction != META_DISPLAY_LEFT &&
-               meta_line2_intersects_with (&motion, &right, &intersection))
-        direction = META_DISPLAY_RIGHT;
-      else if (direction != META_DISPLAY_DOWN &&
-               meta_line2_intersects_with (&motion, &top, &intersection))
-        direction = META_DISPLAY_UP;
-      else if (direction != META_DISPLAY_UP &&
-               meta_line2_intersects_with (&motion, &bottom, &intersection))
-        direction = META_DISPLAY_DOWN;
-      else
-        /* We reached the dest logical monitor */
-        break;
-
-      x = intersection.x;
-      y = intersection.y;
-      dx -= intersection.x - motion.a.x;
-      dy -= intersection.y - motion.a.y;
-
-      cur = meta_monitor_manager_get_logical_monitor_neighbor (monitor_manager,
-                                                               cur, direction);
-    }
-
-  *dx_inout = target_x - cur_x;
-  *dy_inout = target_y - cur_y;
-}
-
-static void
-relative_motion_filter (ClutterInputDevice *device,
-                        float               x,
-                        float               y,
-                        float              *dx,
-                        float              *dy,
-                        gpointer            user_data)
-{
-  MetaMonitorManager *monitor_manager = user_data;
-  MetaLogicalMonitor *logical_monitor, *dest_logical_monitor;
-  float new_dx, new_dy;
-
-  if (meta_is_stage_views_scaled ())
-    return;
-
-  logical_monitor = meta_monitor_manager_get_logical_monitor_at (monitor_manager,
-                                                                 x, y);
-  if (!logical_monitor)
-    return;
-
-  new_dx = (*dx) * logical_monitor->scale;
-  new_dy = (*dy) * logical_monitor->scale;
-
-  dest_logical_monitor = meta_monitor_manager_get_logical_monitor_at (monitor_manager,
-                                                                      x + new_dx,
-                                                                      y + new_dy);
-  if (dest_logical_monitor &&
-      dest_logical_monitor != logical_monitor)
-    {
-      /* If we are crossing monitors, attempt to bisect the distance on each
-       * axis and apply the relative scale for each of them.
-       */
-      new_dx = *dx;
-      new_dy = *dy;
-      relative_motion_across_outputs (monitor_manager, logical_monitor,
-                                      x, y, &new_dx, &new_dy);
-    }
-
-  *dx = new_dx;
-  *dy = new_dy;
-}
-
 static ClutterBackend *
 meta_backend_native_create_clutter_backend (MetaBackend *backend)
 {
@@ -302,9 +188,6 @@ meta_backend_native_post_init (MetaBackend *backend)
   meta_seat_native_set_pointer_constrain_callback (META_SEAT_NATIVE (seat),
                                                    pointer_constrain_callback,
                                                    NULL, NULL);
-  meta_seat_native_set_relative_motion_filter (META_SEAT_NATIVE (seat),
-                                               relative_motion_filter,
-                                               meta_backend_get_monitor_manager (backend));
 
   META_BACKEND_CLASS (meta_backend_native_parent_class)->post_init (backend);
 

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

@@ -993,6 +993,78 @@ meta_seat_native_constrain_pointer (MetaSeatNative     *seat,
   constrain_all_screen_monitors (core_pointer, monitor_manager, new_x, new_y);
 }
 
+static void
+relative_motion_across_outputs (MetaMonitorManager *monitor_manager,
+                                MetaLogicalMonitor *current,
+                                float               cur_x,
+                                float               cur_y,
+                                float              *dx_inout,
+                                float              *dy_inout)
+{
+  MetaLogicalMonitor *cur = current;
+  float x = cur_x, y = cur_y;
+  float target_x = cur_x, target_y = cur_y;
+  float dx = *dx_inout, dy = *dy_inout;
+  MetaDisplayDirection direction = -1;
+
+  while (cur)
+    {
+      MetaLine2 left, right, top, bottom, motion;
+      MetaVector2 intersection;
+
+      motion = (MetaLine2) {
+        .a = { x, y },
+        .b = { x + (dx * cur->scale), y + (dy * cur->scale) }
+      };
+      left = (MetaLine2) {
+        { cur->rect.x, cur->rect.y },
+        { cur->rect.x, cur->rect.y + cur->rect.height }
+      };
+      right = (MetaLine2) {
+        { cur->rect.x + cur->rect.width, cur->rect.y },
+        { cur->rect.x + cur->rect.width, cur->rect.y + cur->rect.height }
+      };
+      top = (MetaLine2) {
+        { cur->rect.x, cur->rect.y },
+        { cur->rect.x + cur->rect.width, cur->rect.y }
+      };
+      bottom = (MetaLine2) {
+        { cur->rect.x, cur->rect.y + cur->rect.height },
+        { cur->rect.x + cur->rect.width, cur->rect.y + cur->rect.height }
+      };
+
+      target_x = motion.b.x;
+      target_y = motion.b.y;
+
+      if (direction != META_DISPLAY_RIGHT &&
+          meta_line2_intersects_with (&motion, &left, &intersection))
+        direction = META_DISPLAY_LEFT;
+      else if (direction != META_DISPLAY_LEFT &&
+               meta_line2_intersects_with (&motion, &right, &intersection))
+        direction = META_DISPLAY_RIGHT;
+      else if (direction != META_DISPLAY_DOWN &&
+               meta_line2_intersects_with (&motion, &top, &intersection))
+        direction = META_DISPLAY_UP;
+      else if (direction != META_DISPLAY_UP &&
+               meta_line2_intersects_with (&motion, &bottom, &intersection))
+        direction = META_DISPLAY_DOWN;
+      else
+        /* We reached the dest logical monitor */
+        break;
+
+      x = intersection.x;
+      y = intersection.y;
+      dx -= intersection.x - motion.a.x;
+      dy -= intersection.y - motion.a.y;
+
+      cur = meta_monitor_manager_get_logical_monitor_neighbor (monitor_manager,
+                                                               cur, direction);
+    }
+
+  *dx_inout = target_x - cur_x;
+  *dy_inout = target_y - cur_y;
+}
+
 void
 meta_seat_native_filter_relative_motion (MetaSeatNative     *seat,
                                          ClutterInputDevice *device,
@@ -1001,11 +1073,40 @@ meta_seat_native_filter_relative_motion (MetaSeatNative     *seat,
                                          float              *dx,
                                          float              *dy)
 {
-  if (!seat->relative_motion_filter)
+  MetaBackend *backend = meta_get_backend ();
+  MetaMonitorManager *monitor_manager =
+    meta_backend_get_monitor_manager (backend);
+  MetaLogicalMonitor *logical_monitor, *dest_logical_monitor;
+  float new_dx, new_dy;
+
+  if (meta_is_stage_views_scaled ())
     return;
 
-  seat->relative_motion_filter (device, x, y, dx, dy,
+  logical_monitor = meta_monitor_manager_get_logical_monitor_at (monitor_manager,
-                                seat->relative_motion_filter_user_data);
+                                                                 x, y);
+  if (!logical_monitor)
+    return;
+
+  new_dx = (*dx) * logical_monitor->scale;
+  new_dy = (*dy) * logical_monitor->scale;
+
+  dest_logical_monitor = meta_monitor_manager_get_logical_monitor_at (monitor_manager,
+                                                                      x + new_dx,
+                                                                      y + new_dy);
+  if (dest_logical_monitor &&
+      dest_logical_monitor != logical_monitor)
+    {
+      /* If we are crossing monitors, attempt to bisect the distance on each
+       * axis and apply the relative scale for each of them.
+       */
+      new_dx = *dx;
+      new_dy = *dy;
+      relative_motion_across_outputs (monitor_manager, logical_monitor,
+                                      x, y, &new_dx, &new_dy);
+    }
+
+  *dx = new_dx;
+  *dy = new_dy;
 }
 
 static void
@@ -3050,17 +3151,6 @@ meta_seat_native_set_pointer_constrain_callback (MetaSeatNative               *s
   seat->constrain_data_notify = user_data_notify;
 }
 
-void
-meta_seat_native_set_relative_motion_filter (MetaSeatNative           *seat,
-                                             MetaRelativeMotionFilter  filter,
-                                             gpointer                  user_data)
-{
-  g_return_if_fail (META_IS_SEAT_NATIVE (seat));
-
-  seat->relative_motion_filter = filter;
-  seat->relative_motion_filter_user_data = user_data;
-}
-
 void
 meta_seat_native_update_xkb_state (MetaSeatNative *seat)
 {

src/backends/native/meta-seat-native.h

@@ -59,12 +59,6 @@ typedef void (* MetaPointerConstrainCallback) (ClutterInputDevice *device,
                                                float              *x,
                                                float              *y,
                                                gpointer            user_data);
-typedef void (* MetaRelativeMotionFilter) (ClutterInputDevice *device,
-                                           float               x,
-                                           float               y,
-                                           float              *dx,
-                                           float              *dy,
-                                           gpointer            user_data);
 
 struct _MetaTouchState
 {
@@ -115,9 +109,6 @@ struct _MetaSeatNative
   gpointer constrain_data;
   GDestroyNotify constrain_data_notify;
 
-  MetaRelativeMotionFilter relative_motion_filter;
-  gpointer relative_motion_filter_user_data;
-
   MetaKeymapNative *keymap;
 
   GUdevClient *udev_client;
@@ -270,10 +261,6 @@ void  meta_seat_native_set_pointer_constrain_callback (MetaSeatNative
                                                        gpointer                      user_data,
                                                        GDestroyNotify                user_data_notify);
 
-void meta_seat_native_set_relative_motion_filter (MetaSeatNative           *seat,
-                                                  MetaRelativeMotionFilter  filter,
-                                                  gpointer                  user_data);
-
 struct xkb_state * meta_seat_native_get_xkb_state (MetaSeatNative *seat);
 
 void               meta_seat_native_set_keyboard_map   (MetaSeatNative    *seat,