The DisplayList mechanism used to use the same interface for both recording and playback. That interface is now the DlOpReceiver interface and is only mainly used during the playback phase of DL dispatching. As such, the dispatch mechanism should only be calling the methods with all arguments (no default values needed and no "subset of arguments" overloads either). The front-facing DlCanvas interface used during recording of rendering ops is the one that should have such convenience mechanisms.

The DlOpReceiver interface class should have all overloads and argument defaults eliminated for clarity and simplicity.