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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 "qcolortransfergeneric_p.h"
#include "qcolortransfertable_p.h"
#include "qcolortrc_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(float gamma, Direction dir)
{
auto cp = create();
cp->setFromGamma(gamma, dir);
return cp;
}
std::shared_ptr<QColorTrcLut> QColorTrcLut::fromTrc(const QColorTrc &trc, Direction dir)
{
if (!trc.isValid())
return nullptr;
auto cp = create();
cp->setFromTrc(trc, dir);
return cp;
}
void QColorTrcLut::setFromGamma(float gamma, Direction dir)
{
constexpr float iRes = 1.f / float(Resolution);
if (dir & ToLinear) {
if (!m_toLinear)
m_toLinear.reset(new ushort[Resolution + 1]);
for (int i = 0; i <= Resolution; ++i) {
const int val = qRound(qPow(i * iRes, gamma) * (255 * 256));
m_toLinear[i] = qBound(0, val, 65280);
}
}
if (dir & FromLinear) {
const float iGamma = 1.f / gamma;
if (!m_fromLinear)
m_fromLinear.reset(new ushort[Resolution + 1]);
for (int i = 0; i <= Resolution; ++i)
m_fromLinear[i] = ushort(qRound(qBound(0.f, qPow(i * iRes, iGamma), 1.f) * (255 * 256)));
}
}
void QColorTrcLut::setFromTransferFunction(const QColorTransferFunction &fun, Direction dir)
{
constexpr float iRes = 1.f / float(Resolution);
if (dir & ToLinear) {
if (!m_toLinear)
m_toLinear.reset(new ushort[Resolution + 1]);
for (int i = 0; i <= Resolution; ++i) {
const int val = qRound(fun.apply(i * iRes)* (255 * 256));
if (val > 65280 && i < m_unclampedToLinear)
m_unclampedToLinear = i;
m_toLinear[i] = qBound(0, val, 65280);
}
}
if (dir & FromLinear) {
if (!m_fromLinear)
m_fromLinear.reset(new ushort[Resolution + 1]);
QColorTransferFunction inv = fun.inverted();
for (int i = 0; i <= Resolution; ++i)
m_fromLinear[i] = ushort(qRound(qBound(0.f, inv.apply(i * iRes), 1.f) * (255 * 256)));
}
}
void QColorTrcLut::setFromTransferGenericFunction(const QColorTransferGenericFunction &fun, Direction dir)
{
constexpr float iRes = 1.f / float(Resolution);
if (dir & ToLinear) {
if (!m_toLinear)
m_toLinear.reset(new ushort[Resolution + 1]);
for (int i = 0; i <= Resolution; ++i) {
const int val = qRound(fun.apply(i * iRes) * (255 * 256));
if (val > 65280 && i < m_unclampedToLinear)
m_unclampedToLinear = i;
m_toLinear[i] = qBound(0, val, 65280);
}
}
if (dir & FromLinear) {
if (!m_fromLinear)
m_fromLinear.reset(new ushort[Resolution + 1]);
for (int i = 0; i <= Resolution; ++i)
m_fromLinear[i] = ushort(qRound(qBound(0.f, fun.applyInverse(i * iRes), 1.f) * (255 * 256)));
}
}
void QColorTrcLut::setFromTransferTable(const QColorTransferTable &table, Direction dir)
{
constexpr float iRes = 1.f / float(Resolution);
if (dir & ToLinear) {
if (!m_toLinear)
m_toLinear.reset(new ushort[Resolution + 1]);
for (int i = 0; i <= Resolution; ++i)
m_toLinear[i] = ushort(qRound(table.apply(i * iRes) * (255 * 256)));
}
if (dir & FromLinear) {
if (!m_fromLinear)
m_fromLinear.reset(new ushort[Resolution + 1]);
float minInverse = 0.0f;
for (int i = 0; i <= Resolution; ++i) {
minInverse = table.applyInverse(i * iRes, minInverse);
m_fromLinear[i] = ushort(qRound(minInverse * (255 * 256)));
}
}
}
void QColorTrcLut::setFromTrc(const QColorTrc &trc, Direction dir)
{
switch (trc.m_type) {
case QColorTrc::Type::ParameterizedFunction:
return setFromTransferFunction(trc.fun(), dir);
case QColorTrc::Type::Table:
return setFromTransferTable(trc.table(), dir);
case QColorTrc::Type::GenericFunction:
return setFromTransferGenericFunction(trc.hdr(), dir);
case QColorTrc::Type::Uninitialized:
break;
}
}
QT_END_NAMESPACE
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