private MemoryStream GetPreviousStateMemoryStream()
{
if (_rewindDeltaEnable)
{
// When capturing deltas, the most recent state is stored in _lastState, and the
// last item in the rewind buffer gets us back to the previous state.
return(_rewindBuffer.PopMemoryStream());
}
else
{
// When capturing full states, the last item in the rewind buffer is the most
// recent state, so we need to get the item before it.
_rewindBuffer.Pop();
return(_rewindBuffer.PeekMemoryStream());
}
// Note that in both cases, after loading the state, we still have a copy of it
// either in _lastState or as the last item in the rewind buffer. This is good
// because once we resume capturing, the first capture doesn't happen until
// stepping forward to the following frame, which would result in a gap if we
// didn't still have a copy of the current state here.
}
