backend/drm: extract logic to build current connector state

backend/drm/backend.c

@@ -95,6 +95,24 @@ struct wlr_backend *wlr_drm_backend_get_parent(struct wlr_backend *backend) {
 	return drm->parent ? &drm->parent->backend : NULL;
 }
 
+static void build_current_connector_state(struct wlr_output_state *state,
+		struct wlr_drm_connector *conn) {
+	bool enabled = conn->status != DRM_MODE_DISCONNECTED && conn->output.enabled;
+
+	wlr_output_state_init(state);
+	wlr_output_state_set_enabled(state, enabled);
+	if (!enabled) {
+		return;
+	}
+
+	if (conn->output.current_mode != NULL) {
+		wlr_output_state_set_mode(state, conn->output.current_mode);
+	} else {
+		wlr_output_state_set_custom_mode(state,
+			conn->output.width, conn->output.height, conn->output.refresh);
+	}
+}
+
 static void handle_session_active(struct wl_listener *listener, void *data) {
 	struct wlr_drm_backend *drm =
 		wl_container_of(listener, drm, session_active);
@@ -125,19 +143,8 @@ static void handle_session_active(struct wl_listener *listener, void *data) {
 
 	struct wlr_drm_connector *conn;
 	wl_list_for_each(conn, &drm->connectors, link) {
-		bool enabled = conn->status != DRM_MODE_DISCONNECTED && conn->output.enabled;
-
 		struct wlr_output_state state;
-		wlr_output_state_init(&state);
-		wlr_output_state_set_enabled(&state, enabled);
-		if (enabled) {
-			if (conn->output.current_mode != NULL) {
-				wlr_output_state_set_mode(&state, conn->output.current_mode);
-			} else {
-				wlr_output_state_set_custom_mode(&state,
-					conn->output.width, conn->output.height, conn->output.refresh);
-			}
-		}
+		build_current_connector_state(&state, conn);
 		if (!drm_connector_commit_state(conn, &state)) {
 			wlr_drm_conn_log(conn, WLR_ERROR, "Failed to restore state after VT switch");
 		}