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diff --git a/src/gui/painting/qcolortrc_p.h b/src/gui/painting/qcolortrc_p.h
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+/****************************************************************************
+**
+** 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 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;
+    }
+
+    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