player: update cache state only if requested

Add a mechanism to the client API code, which allows the player core to
query whether a client API event is needed at all. Use it for the cache
update.

In this case, this is probably a pure microoptimization; but the
mechanism will be useful for other things too.

1 files changed, 1 insertions, 0 deletions

diff --git a/player/client.h b/player/client.h
index b329ae6d7b..a8804dbf82 100644
--- a/player/client.h
+++ b/player/client.h
@@ -17,6 +17,7 @@ int mp_clients_num(struct MPContext *mpctx);
 void mp_client_broadcast_event(struct MPContext *mpctx, int event, void *data);
 int mp_client_send_event(struct MPContext *mpctx, const char *client_name,
                          int event, void *data);
+bool mp_client_event_is_registered(struct MPContext *mpctx, int event);
 void mp_client_property_change(struct MPContext *mpctx, const char *name);
 
 struct mpv_handle *mp_new_client(struct mp_client_api *clients, const char *name);