Add a output_created_signal on weston_compositor

src/compositor.c

@@ -3076,6 +3076,7 @@ weston_output_init(struct weston_output *output, struct weston_compositor *c,
 	output->global =
 		wl_display_add_global(c->wl_display, &wl_output_interface,
 				      output, bind_output);
+	wl_signal_emit(&c->output_created_signal, output);
 }
 
 static void
@@ -3154,6 +3155,7 @@ weston_compositor_init(struct weston_compositor *ec,
 	wl_signal_init(&ec->show_input_panel_signal);
 	wl_signal_init(&ec->hide_input_panel_signal);
 	wl_signal_init(&ec->seat_created_signal);
+	wl_signal_init(&ec->output_created_signal);
 	ec->launcher_sock = weston_environment_get_fd("WESTON_LAUNCHER_SOCK");
 
 	ec->output_id_pool = 0;

src/compositor.h

@@ -313,6 +313,7 @@ struct weston_compositor {
 	struct wl_signal hide_input_panel_signal;
 
 	struct wl_signal seat_created_signal;
+	struct wl_signal output_created_signal;
 
 	struct wl_event_loop *input_loop;
 	struct wl_event_source *input_loop_source;