diff options
Diffstat (limited to 'src/gui/painting/qcolortrc_p.h')
-rw-r--r-- | src/gui/painting/qcolortrc_p.h | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/src/gui/painting/qcolortrc_p.h b/src/gui/painting/qcolortrc_p.h new file mode 100644 index 0000000000..3ef9d442fc --- /dev/null +++ b/src/gui/painting/qcolortrc_p.h @@ -0,0 +1,148 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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(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 |