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