kis_random_source.cpp

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/*
 *  SPDX-FileCopyrightText: 2015 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#include "kis_random_source.h"
 
#include <boost/random/normal_distribution.hpp>
#include <boost/random/taus88.hpp>
#include <boost/random/uniform_smallint.hpp>
 
#include <QRandomGenerator>
 
struct KisRandomSource::Private
{
    Private()
        : uniformSource(QRandomGenerator::global()->generate()) {}
 
    Private(int seed)
        : uniformSource(seed) {}
 
    boost::taus88 uniformSource;
};
 
 
KisRandomSource::KisRandomSource()
    : m_d(new Private)
{
}
 
KisRandomSource::KisRandomSource(int seed)
    : m_d(new Private(seed))
{
}
 
KisRandomSource::KisRandomSource(const KisRandomSource &rhs)
    : KisShared(),
      m_d(new Private(*rhs.m_d))
{
}
 
KisRandomSource& KisRandomSource::operator=(const KisRandomSource &rhs)
{
    if (this != &rhs) {
        *m_d = *rhs.m_d;
    }
 
    return *this;
}
 
KisRandomSource::~KisRandomSource()
{
}
 
qint64 KisRandomSource::generate() const
{
    return m_d->uniformSource();
}
 
int KisRandomSource::generate(int min, int max) const
{
    boost::uniform_smallint<int> smallint(min, max);
    return smallint(m_d->uniformSource);
}
 
qreal KisRandomSource::generateNormalized() const
{
    const qint64 v = m_d->uniformSource();
    const qint64 max = m_d->uniformSource.max();
    // we don't have min, because taus88 is always positive
 
    return qreal(v) / max;
}
 
qreal KisRandomSource::generateGaussian(qreal mean, qreal sigma) const
{
    boost::normal_distribution<qreal> normal(mean, sigma);
    return normal(m_d->uniformSource);
}