x11: parse vendor and model out of xcb setup information

backend/x11/backend.c

@@ -188,6 +188,17 @@ static void init_atom(struct wlr_x11_backend *x11, struct wlr_x11_atom *atom,
 	atom->reply = xcb_intern_atom_reply(x11->xcb_conn, atom->cookie, NULL);
 }
 
+static void parse_xcb_setup(struct wlr_output *output, xcb_connection_t *xcb_conn) {
+	const xcb_setup_t *xcb_setup = xcb_get_setup(xcb_conn);
+
+	snprintf(output->make, sizeof(output->make), "%.*s",
+			xcb_setup_vendor_length(xcb_setup),
+			xcb_setup_vendor(xcb_setup));
+	snprintf(output->model, sizeof(output->model), "%"PRIu16".%"PRIu16,
+			xcb_setup->protocol_major_version,
+			xcb_setup->protocol_minor_version);
+}
+
 static bool wlr_x11_backend_start(struct wlr_backend *backend) {
 	struct wlr_x11_backend *x11 = (struct wlr_x11_backend *)backend;
 	struct wlr_x11_output *output = &x11->output;
@@ -207,6 +218,7 @@ static bool wlr_x11_backend_start(struct wlr_backend *backend) {
 	wlr_output_init(&output->wlr_output, &x11->backend, &output_impl,
 		x11->wl_display);
 	snprintf(output->wlr_output.name, sizeof(output->wlr_output.name), "X11-1");
+	parse_xcb_setup(&output->wlr_output, x11->xcb_conn);
 
 	output->win = xcb_generate_id(x11->xcb_conn);
 	xcb_create_window(x11->xcb_conn, XCB_COPY_FROM_PARENT, output->win,