data-device: Update drag icon position from configure and motion handlers

We can now update the drag icon position directly from the configure
handler or the grab motion handler, and no longer need
weston_seat_update_drag_surface().

src/compositor.c

@@ -1182,8 +1182,6 @@ weston_output_repaint(struct weston_output *output, uint32_t msecs)
 	struct wl_list frame_callback_list;
 	pixman_region32_t output_damage;
 
-	weston_compositor_update_drag_surfaces(ec);
-
 	/* Rebuild the surface list and update surface transforms up front. */
 	wl_list_init(&ec->surface_list);
 	wl_list_init(&frame_callback_list);

src/compositor.h

@@ -334,8 +334,6 @@ void
 weston_seat_set_keyboard(struct weston_seat *seat, struct weston_keyboard *keyboard);
 void
 weston_seat_set_touch(struct weston_seat *seat, struct weston_touch *touch);
-void
-weston_seat_update_drag_surface(struct weston_seat *seat, int dx, int dy);
 
 void
 weston_pointer_init(struct weston_pointer *pointer);
@@ -474,6 +472,7 @@ struct weston_seat {
 	struct weston_pointer_grab drag_grab;
 	struct weston_surface *drag_surface;
 	struct wl_listener drag_surface_destroy_listener;
+	int32_t drag_dx, drag_dy;
 
 	uint32_t num_tp;
 
@@ -856,8 +855,6 @@ void
 weston_compositor_offscreen(struct weston_compositor *compositor);
 void
 weston_compositor_sleep(struct weston_compositor *compositor);
-void
-weston_compositor_update_drag_surfaces(struct weston_compositor *compositor);
 struct weston_surface *
 weston_compositor_pick_surface(struct weston_compositor *compositor,
 			       wl_fixed_t x, wl_fixed_t y,

src/data-device.c

@@ -167,6 +167,7 @@ drag_surface_configure(struct weston_surface *es, int32_t sx, int32_t sy, int32_
 {
 	struct weston_seat *seat = es->configure_private;
 	struct wl_list *list;
+	float fx, fy;
 
 	if (!weston_surface_is_mapped(es) && es->buffer_ref.buffer) {
 		if (seat->sprite && weston_surface_is_mapped(seat->sprite))
@@ -179,9 +180,12 @@ drag_surface_configure(struct weston_surface *es, int32_t sx, int32_t sy, int32_
 		empty_region(&es->pending.input);
 	}
 
-	weston_surface_configure(es,
-				 es->geometry.x + sx, es->geometry.y + sy,
-				 width, height);
+	seat->drag_dx += sx;
+	seat->drag_dy += sy;
+
+	fx = wl_fixed_to_double(seat->pointer->x) + seat->drag_dx;
+	fy = wl_fixed_to_double(seat->pointer->y) + seat->drag_dy;
+	weston_surface_configure(es, fx, fy, width, height);
 }
 
 static int
@@ -196,10 +200,8 @@ device_setup_new_drag_surface(struct weston_seat *seat,
 	}
 
 	seat->drag_surface = surface;
-
-	weston_surface_set_position(seat->drag_surface,
-				    wl_fixed_to_double(seat->pointer->x),
-				    wl_fixed_to_double(seat->pointer->y));
+	seat->drag_dx = 0;
+	seat->drag_dy = 0;
 
 	surface->configure = drag_surface_configure;
 	surface->configure_private = seat;
@@ -222,29 +224,6 @@ device_release_drag_surface(struct weston_seat *seat)
 	seat->drag_surface = NULL;
 }
 
-void
-weston_seat_update_drag_surface(struct weston_seat *seat, int dx, int dy)
-{
-	if (!seat->drag_surface)
-		return;
-
-	if (!dx && !dy)
-		return;
-
-	weston_surface_set_position(seat->drag_surface,
-				    seat->drag_surface->geometry.x + wl_fixed_to_double(dx),
-				    seat->drag_surface->geometry.y + wl_fixed_to_double(dy));
-}
-
-void
-weston_compositor_update_drag_surfaces(struct weston_compositor *compositor)
-{
-	struct weston_seat *seat;
-
-	wl_list_for_each(seat, &compositor->seat_list, link)
-		weston_seat_update_drag_surface(seat, 0, 0);
-}
-
 static void
 destroy_drag_focus(struct wl_listener *listener, void *data)
 {
@@ -307,6 +286,14 @@ drag_grab_motion(struct weston_pointer_grab *grab,
 {
 	struct weston_seat *seat =
 		container_of(grab, struct weston_seat, drag_grab);
+	float fx, fy;
+
+	if (seat->drag_surface) {
+		fx = wl_fixed_to_double(seat->pointer->x) + seat->drag_dx;
+		fy = wl_fixed_to_double(seat->pointer->y) + seat->drag_dy;
+		weston_surface_set_position(seat->drag_surface, fx, fy);
+		weston_surface_schedule_repaint(seat->drag_surface);
+	}
 
 	if (seat->drag_focus_resource)
 		wl_data_device_send_motion(seat->drag_focus_resource,
@@ -316,10 +303,8 @@ drag_grab_motion(struct weston_pointer_grab *grab,
 static void
 data_device_end_drag_grab(struct weston_seat *seat)
 {
-	if (seat->drag_surface) {
+	if (seat->drag_surface)
 		device_release_drag_surface(seat);
-		weston_seat_update_drag_surface(seat, 0, 0);
-	}
 
 	drag_grab_focus(&seat->drag_grab, NULL,
 	                wl_fixed_from_int(0), wl_fixed_from_int(0));
@@ -408,7 +393,6 @@ data_device_start_drag(struct wl_client *client, struct wl_resource *resource,
 	if (icon_resource) {
 		if (!device_setup_new_drag_surface(seat, icon_resource->data))
 			return;
-		weston_seat_update_drag_surface(seat, 0, 0);
 	}
 
 	weston_pointer_set_focus(seat->pointer, NULL,

src/input.c

@@ -639,8 +639,6 @@ move_pointer(struct weston_seat *seat, wl_fixed_t x, wl_fixed_t y)
 
 	clip_pointer_motion(seat, &x, &y);
 
-	weston_seat_update_drag_surface(seat, x - pointer->x, y - pointer->y);
-
 	pointer->x = x;
 	pointer->y = y;