Generation stamp of the last content mutation to this storage:
any image transmit/replace, placement add, or delete. Zero means
the storage has never been mutated (and is therefore empty).
Generation stamp of the last content mutation to this storage:
any image transmit/replace, placement add, or delete. Zero means
the storage has never been mutated (and is therefore empty).
Populate a pre-allocated placement iterator with placement data from
the storage. Iterator data is only valid as long as the underlying
terminal is not mutated.