KisRollingMeanAccumulatorWrapper.cpp

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/*
 *  SPDX-FileCopyrightText: 2017 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#include "KisRollingMeanAccumulatorWrapper.h"
 
#include <boost/accumulators/accumulators.hpp>
#include <boost/accumulators/statistics/stats.hpp>
#include <boost/accumulators/statistics/rolling_mean.hpp>
 
using namespace boost::accumulators;
 
struct KisRollingMeanAccumulatorWrapper::Private {
    Private(int windowSize)
        : accumulator(tag::rolling_window::window_size = windowSize)
    {
    }
 
    accumulator_set<qreal, stats<tag::lazy_rolling_mean> > accumulator;
};
 
 
KisRollingMeanAccumulatorWrapper::KisRollingMeanAccumulatorWrapper(int windowSize)
    : m_d(new Private(windowSize))
{
}
 
KisRollingMeanAccumulatorWrapper::~KisRollingMeanAccumulatorWrapper()
{
}
 
void KisRollingMeanAccumulatorWrapper::operator()(qreal value)
{
    m_d->accumulator(value);
}
 
qreal KisRollingMeanAccumulatorWrapper::rollingMean() const
{
    return boost::accumulators::rolling_mean(m_d->accumulator);
}
 
qreal KisRollingMeanAccumulatorWrapper::rollingMeanSafe() const
{
    return boost::accumulators::rolling_count(m_d->accumulator) > 0 ?
        boost::accumulators::rolling_mean(m_d->accumulator) : 0;
}
 
int KisRollingMeanAccumulatorWrapper::rollingCount() const
{
    return boost::accumulators::rolling_count(m_d->accumulator);
}
 
void KisRollingMeanAccumulatorWrapper::reset(int windowSize)
{
    m_d->accumulator =
        accumulator_set<qreal, stats<tag::lazy_rolling_mean>>(
            tag::rolling_window::window_size = windowSize);
}