seat: don't send motion if pointer hasn't moved

include/wlr/types/wlr_seat.h

@@ -135,6 +135,7 @@ struct wlr_seat_pointer_state {
 	struct wlr_seat *seat;
 	struct wlr_seat_client *focused_client;
 	struct wlr_surface *focused_surface;
+	double sx, sy;
 
 	struct wlr_seat_pointer_grab *grab;
 	struct wlr_seat_pointer_grab *default_grab;

rootston/cursor.c

@@ -101,8 +101,7 @@ static void seat_view_deco_button(struct roots_seat_view *view, double sx,
 }
 
 static void roots_passthrough_cursor(struct roots_cursor *cursor,
-		int64_t time) {
-	bool focus_changed;
+		uint32_t time) {
 	double sx, sy;
 	struct roots_view *view = NULL;
 	struct roots_seat *seat = cursor->seat;
@@ -146,11 +145,8 @@ static void roots_passthrough_cursor(struct roots_cursor *cursor,
 	cursor->wlr_surface = surface;
 
 	if (surface) {
-		focus_changed = (seat->seat->pointer_state.focused_surface != surface);
 		wlr_seat_pointer_notify_enter(seat->seat, surface, sx, sy);
-		if (!focus_changed && time > 0) {
-			wlr_seat_pointer_notify_motion(seat->seat, time, sx, sy);
-		}
+		wlr_seat_pointer_notify_motion(seat->seat, time, sx, sy);
 	} else {
 		wlr_seat_pointer_clear_focus(seat->seat);
 	}
@@ -161,8 +157,15 @@ static void roots_passthrough_cursor(struct roots_cursor *cursor,
 	}
 }
 
+static inline int64_t timespec_to_msec(const struct timespec *a) {
+	return (int64_t)a->tv_sec * 1000 + a->tv_nsec / 1000000;
+}
+
 void roots_cursor_update_focus(struct roots_cursor *cursor) {
-	roots_passthrough_cursor(cursor, -1);
+	struct timespec now;
+	clock_gettime(CLOCK_MONOTONIC, &now);
+
+	roots_passthrough_cursor(cursor, timespec_to_msec(&now));
 }
 
 void roots_cursor_update_position(struct roots_cursor *cursor,

rootston/input.c

@@ -136,10 +136,11 @@ static inline int64_t timespec_to_msec(const struct timespec *a) {
 }
 
 void input_update_cursor_focus(struct roots_input *input) {
-	struct roots_seat *seat;
 	struct timespec now;
+	clock_gettime(CLOCK_MONOTONIC, &now);
+
+	struct roots_seat *seat;
 	wl_list_for_each(seat, &input->seats, link) {
-		clock_gettime(CLOCK_MONOTONIC, &now);
 		roots_cursor_update_position(seat->cursor, timespec_to_msec(&now));
 	}
 }

types/seat/wlr_seat_pointer.c

@@ -187,6 +187,13 @@ void wlr_seat_pointer_enter(struct wlr_seat *wlr_seat,
 
 	wlr_seat->pointer_state.focused_client = client;
 	wlr_seat->pointer_state.focused_surface = surface;
+	if (surface != NULL) {
+		wlr_seat->pointer_state.sx = sx;
+		wlr_seat->pointer_state.sy = sy;
+	} else {
+		wlr_seat->pointer_state.sx = NAN;
+		wlr_seat->pointer_state.sy = NAN;
+	}
 
 	struct wlr_seat_pointer_focus_change_event event = {
 		.seat = wlr_seat,
@@ -209,6 +216,10 @@ void wlr_seat_pointer_send_motion(struct wlr_seat *wlr_seat, uint32_t time,
 		return;
 	}
 
+	if (wlr_seat->pointer_state.sx == sx && wlr_seat->pointer_state.sy == sy) {
+		return;
+	}
+
 	struct wl_resource *resource;
 	wl_resource_for_each(resource, &client->pointers) {
 		if (wlr_seat_client_from_pointer_resource(resource) == NULL) {
@@ -218,6 +229,9 @@ void wlr_seat_pointer_send_motion(struct wlr_seat *wlr_seat, uint32_t time,
 		wl_pointer_send_motion(resource, time, wl_fixed_from_double(sx),
 			wl_fixed_from_double(sy));
 	}
+
+	wlr_seat->pointer_state.sx = sx;
+	wlr_seat->pointer_state.sy = sy;
 }
 
 uint32_t wlr_seat_pointer_send_button(struct wlr_seat *wlr_seat, uint32_t time,