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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qcolortrclut_p.h"
#include "qcolortransferfunction_p.h"
#include "qcolortransfertable_p.h"
#include <qmath.h>
QT_BEGIN_NAMESPACE
std::shared_ptr<QColorTrcLut> QColorTrcLut::create()
{
struct Access : QColorTrcLut {};
return std::make_shared<Access>();
}
std::shared_ptr<QColorTrcLut> QColorTrcLut::fromGamma(qreal gamma)
{
auto cp = create();
for (int i = 0; i <= (255 * 16); ++i) {
cp->m_toLinear[i] = ushort(qRound(qPow(i / qreal(255 * 16), gamma) * (255 * 256)));
cp->m_fromLinear[i] = ushort(qRound(qPow(i / qreal(255 * 16), qreal(1) / gamma) * (255 * 256)));
}
return cp;
}
std::shared_ptr<QColorTrcLut> QColorTrcLut::fromTransferFunction(const QColorTransferFunction &fun)
{
auto cp = create();
QColorTransferFunction inv = fun.inverted();
for (int i = 0; i <= (255 * 16); ++i) {
cp->m_toLinear[i] = ushort(qRound(fun.apply(i / qreal(255 * 16)) * (255 * 256)));
cp->m_fromLinear[i] = ushort(qRound(inv.apply(i / qreal(255 * 16)) * (255 * 256)));
}
return cp;
}
std::shared_ptr<QColorTrcLut> QColorTrcLut::fromTransferTable(const QColorTransferTable &table)
{
auto cp = create();
float minInverse = 0.0f;
for (int i = 0; i <= (255 * 16); ++i) {
cp->m_toLinear[i] = ushort(qBound(0, qRound(table.apply(i / qreal(255 * 16)) * (255 * 256)), 65280));
minInverse = table.applyInverse(i / qreal(255 * 16), minInverse);
cp->m_fromLinear[i] = ushort(qBound(0, qRound(minInverse * (255 * 256)), 65280));
}
return cp;
}
QT_END_NAMESPACE
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