Function _ComputeInvalidInterval

pxr/exec/exec/program.cpp:678–715

}

static EfTimeInterval
_ComputeInvalidInterval(
    const std::optional<TsSpline> &oldSpline,
    const std::optional<TsSpline> &newSpline)
{
    // If either the new- or old value (or both) resolve to anything but a 
    // spline (fallback, default, or time samples) we invalidate the full
    // interval: Both fallback and default values apply over all time, and time
    // samples typically encode such dense data that we do not want to incur
    // the cost of detailed analysis of that data.
    const bool hasOldSpline = oldSpline.has_value();
    const bool hasNewSpline = newSpline.has_value();
    if (!hasOldSpline || !hasNewSpline) {
        return EfTimeInterval::GetFullInterval();
    }

    TRACE_FUNCTION();

    // If we are going from an empty spline to a non-empty spline or vice-versa,
    // invalidate the full interval.
    if (oldSpline->IsEmpty() != newSpline->IsEmpty()) {
        return EfTimeInterval::GetFullInterval();
    }

    // If loop parameters changed, we invalidate the full interval.
    if (oldSpline->HasLoops() != newSpline->HasLoops()) {
        return EfTimeInterval::GetFullInterval();
    }

    // If both splines are empty, nothing is invalid.
    if (oldSpline->IsEmpty() && newSpline->IsEmpty()) {
        return EfTimeInterval();
    }

    // TODO: Compute the change interval between oldSpline and newSpline. For
    // the time-being, let's over-invalidate the time range.
    return EfTimeInterval::GetFullInterval();
}

static TfBits
_FilterTimeDependentOutputs(