Method getReferenceFrame

Engine/TrackMarker.cpp:701–735

}

int
TrackMarker::getReferenceFrame(int time,
                               int frameStep) const
{
    QMutexLocker k(&_imp->trackMutex);
    std::set<int>::iterator upper = _imp->userKeyframes.upper_bound(time);

    if ( upper == _imp->userKeyframes.end() ) {
        //all keys are lower than time, pick the last one
        if ( !_imp->userKeyframes.empty() ) {
            return *_imp->userKeyframes.rbegin();
        }

        // no keyframe - use the previous/next as reference
        return time - frameStep;
    } else {
        if ( upper == _imp->userKeyframes.begin() ) {
            ///all keys are greater than time
            return *upper;
        }

        int upperKeyFrame = *upper;
        ///If we find "time" as a keyframe, then use it
        --upper;

        int lowerKeyFrame = *upper;

        if (lowerKeyFrame == time) {
            return time;
        }

        /// return the nearest from time
        return (time - lowerKeyFrame) < (upperKeyFrame - time) ? lowerKeyFrame : upperKeyFrame;
    }
}

void
TrackMarker::resetCenter()