void api_activate_surface(char const *appid, char const *role, char const *drawing_area, const reply_func &reply);
void api_deactivate_surface(char const *appid, char const *role, const reply_func &reply);
void api_enddraw(char const *appid, char const *role);
void api_activate_surface(char const *appid, char const *role, char const *drawing_area, const reply_func &reply);
void api_deactivate_surface(char const *appid, char const *role, const reply_func &reply);
void api_enddraw(char const *appid, char const *role);