void activateSurface(const char *label);
void deactivateSurface(const char *label);
void endDraw(const char *label);
+ int dispatch();
static void onCall(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg);
static void onEvent(void *closure, const char *event, struct afb_wsj1_msg *msg);