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// Copyright (C) 2018 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
#ifndef QCOLORTRC_P_H
#define QCOLORTRC_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtGui/private/qtguiglobal_p.h>
#include "qcolortransferfunction_p.h"
#include "qcolortransfertable_p.h"
QT_BEGIN_NAMESPACE
// Defines an ICC TRC (Tone Reproduction Curve)
class Q_GUI_EXPORT QColorTrc
{
public:
QColorTrc() noexcept : m_type(Type::Uninitialized)
{ }
QColorTrc(const QColorTransferFunction &fun) : m_type(Type::Function), m_fun(fun)
{ }
QColorTrc(const QColorTransferTable &table) : m_type(Type::Table), m_table(table)
{ }
enum class Type {
Uninitialized,
Function,
Table
};
bool isLinear() const
{
return m_type == Type::Uninitialized || (m_type == Type::Function && m_fun.isLinear());
}
bool isValid() const
{
return m_type != Type::Uninitialized;
}
float apply(float x) const
{
if (m_type == Type::Table)
return m_table.apply(x);
if (m_type == Type::Function)
return m_fun.apply(x);
return x;
}
float applyExtended(float x) const
{
if (x >= 0.0f && x <= 1.0f)
return apply(x);
if (m_type == Type::Function)
return std::copysign(m_fun.apply(std::abs(x)), x);
if (m_type == Type::Table)
return x < 0.0f ? 0.0f : 1.0f;
return x;
}
float applyInverse(float x) const
{
if (m_type == Type::Table)
return m_table.applyInverse(x);
if (m_type == Type::Function)
return m_fun.inverted().apply(x);
return x;
}
float applyInverseExtended(float x) const
{
if (x >= 0.0f && x <= 1.0f)
return applyInverse(x);
if (m_type == Type::Function)
return std::copysign(applyInverse(std::abs(x)), x);
if (m_type == Type::Table)
return x < 0.0f ? 0.0f : 1.0f;
return x;
}
friend inline bool operator!=(const QColorTrc &o1, const QColorTrc &o2);
friend inline bool operator==(const QColorTrc &o1, const QColorTrc &o2);
Type m_type;
QColorTransferFunction m_fun;
QColorTransferTable m_table;
};
inline bool operator!=(const QColorTrc &o1, const QColorTrc &o2)
{
if (o1.m_type != o2.m_type)
return true;
if (o1.m_type == QColorTrc::Type::Function)
return o1.m_fun != o2.m_fun;
if (o1.m_type == QColorTrc::Type::Table)
return o1.m_table != o2.m_table;
return false;
}
inline bool operator==(const QColorTrc &o1, const QColorTrc &o2)
{
return !(o1 != o2);
}
QT_END_NAMESPACE
#endif // QCOLORTRC
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