tinywl: handle wlr_output.events.request_state

tinywl/tinywl.c

@@ -73,6 +73,7 @@ struct tinywl_output {
 	struct tinywl_server *server;
 	struct wlr_output *wlr_output;
 	struct wl_listener frame;
+	struct wl_listener request_state;
 	struct wl_listener destroy;
 };
 
@@ -568,10 +569,20 @@ static void output_frame(struct wl_listener *listener, void *data) {
 	wlr_scene_output_send_frame_done(scene_output, &now);
 }
 
+static void output_request_state(struct wl_listener *listener, void *data) {
+	/* This function is called when the backend requests a new state for
+	 * the output. For example, Wayland and X11 backends request a new mode
+	 * when the output window is resized. */
+	struct tinywl_output *output = wl_container_of(listener, output, request_state);
+	const struct wlr_output_event_request_state *event = data;
+	wlr_output_commit_state(output->wlr_output, event->state);
+}
+
 static void output_destroy(struct wl_listener *listener, void *data) {
 	struct tinywl_output *output = wl_container_of(listener, output, destroy);
 
 	wl_list_remove(&output->frame.link);
+	wl_list_remove(&output->request_state.link);
 	wl_list_remove(&output->destroy.link);
 	wl_list_remove(&output->link);
 	free(output);
@@ -607,11 +618,16 @@ static void server_new_output(struct wl_listener *listener, void *data) {
 		calloc(1, sizeof(struct tinywl_output));
 	output->wlr_output = wlr_output;
 	output->server = server;
-	/* Sets up a listener for the frame notify event. */
+
+	/* Sets up a listener for the frame event. */
 	output->frame.notify = output_frame;
 	wl_signal_add(&wlr_output->events.frame, &output->frame);
 
-	/* Sets up a listener for the destroy notify event. */
+	/* Sets up a listener for the state request event. */
+	output->request_state.notify = output_request_state;
+	wl_signal_add(&wlr_output->events.request_state, &output->request_state);
+
+	/* Sets up a listener for the destroy event. */
 	output->destroy.notify = output_destroy;
 	wl_signal_add(&wlr_output->events.destroy, &output->destroy);