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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 QCOLORMATRIX_H
+#define QCOLORMATRIX_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/qtguiglobal.h>
+#include <cmath>
+
+QT_BEGIN_NAMESPACE
+
+// An abstract 3 value color
+class QColorVector
+{
+public:
+ QColorVector() = default;
+ constexpr QColorVector(float x, float y, float z) : x(x), y(y), z(z), _unused(0.0f) { }
+ float x; // X, x or red
+ float y; // Y, y or green
+ float z; // Z, Y or blue
+ float _unused;
+
+ friend inline bool operator==(const QColorVector &v1, const QColorVector &v2);
+ friend inline bool operator!=(const QColorVector &v1, const QColorVector &v2);
+
+ static constexpr QColorVector null() { return QColorVector(0.0f, 0.0f, 0.0f); }
+ // Common whitepoints on normalized XYZ form:
+ static constexpr QColorVector D50() { return QColorVector(0.96421f, 1.0f, 0.82519f); }
+ static constexpr QColorVector D65() { return QColorVector(0.95043f, 1.0f, 1.08890f); }
+};
+
+inline bool operator==(const QColorVector &v1, const QColorVector &v2)
+{
+ return (std::abs(v1.x - v2.x) < (1.0f / 2048.0f))
+ && (std::abs(v1.y - v2.y) < (1.0f / 2048.0f))
+ && (std::abs(v1.z - v2.z) < (1.0f / 2048.0f));
+}
+
+inline bool operator!=(const QColorVector &v1, const QColorVector &v2)
+{
+ return !(v1 == v2);
+}
+
+
+// A matrix mapping 3 value colors.
+// Not using QMatrix because only floats are needed and performance is critical.
+class QColorMatrix
+{
+public:
+ // We are storing the matrix transposed as that is more convenient:
+ QColorVector r;
+ QColorVector g;
+ QColorVector b;
+
+ friend inline bool operator==(const QColorMatrix &m1, const QColorMatrix &m2);
+ friend inline bool operator!=(const QColorMatrix &m1, const QColorMatrix &m2);
+
+ bool isValid() const
+ {
+ // A color matrix must be invertible
+ float det = r.x * (b.z * g.y - g.z * b.y) -
+ r.y * (b.z * g.x - g.z * b.x) +
+ r.z * (b.y * g.x - g.y * b.x);
+ return !qFuzzyIsNull(det);
+ }
+
+ QColorMatrix inverted() const
+ {
+ float det = r.x * (b.z * g.y - g.z * b.y) -
+ r.y * (b.z * g.x - g.z * b.x) +
+ r.z * (b.y * g.x - g.y * b.x);
+ det = 1.0f / det;
+ QColorMatrix inv;
+ inv.r.x = (g.y * b.z - b.y * g.z) * det;
+ inv.r.y = (b.y * r.z - r.y * b.z) * det;
+ inv.r.z = (r.y * g.z - g.y * r.z) * det;
+ inv.g.x = (b.x * g.z - g.x * b.z) * det;
+ inv.g.y = (r.x * b.z - b.x * r.z) * det;
+ inv.g.z = (g.x * r.z - r.x * g.z) * det;
+ inv.b.x = (g.x * b.y - b.x * g.y) * det;
+ inv.b.y = (b.x * r.y - r.x * b.y) * det;
+ inv.b.z = (r.x * g.y - g.x * r.y) * det;
+ return inv;
+ }
+ QColorMatrix operator*(const QColorMatrix &o) const
+ {
+ QColorMatrix comb;
+ comb.r.x = r.x * o.r.x + g.x * o.r.y + b.x * o.r.z;
+ comb.g.x = r.x * o.g.x + g.x * o.g.y + b.x * o.g.z;
+ comb.b.x = r.x * o.b.x + g.x * o.b.y + b.x * o.b.z;
+
+ comb.r.y = r.y * o.r.x + g.y * o.r.y + b.y * o.r.z;
+ comb.g.y = r.y * o.g.x + g.y * o.g.y + b.y * o.g.z;
+ comb.b.y = r.y * o.b.x + g.y * o.b.y + b.y * o.b.z;
+
+ comb.r.z = r.z * o.r.x + g.z * o.r.y + b.z * o.r.z;
+ comb.g.z = r.z * o.g.x + g.z * o.g.y + b.z * o.g.z;
+ comb.b.z = r.z * o.b.x + g.z * o.b.y + b.z * o.b.z;
+ return comb;
+
+ }
+ QColorVector map(const QColorVector &c) const
+ {
+ return QColorVector { c.x * r.x + c.y * g.x + c.z * b.x,
+ c.x * r.y + c.y * g.y + c.z * b.y,
+ c.x * r.z + c.y * g.z + c.z * b.z };
+ }
+ QColorMatrix transposed() const
+ {
+ return QColorMatrix { { r.x, g.x, b.x },
+ { r.y, g.y, b.y },
+ { r.z, g.z, b.z } };
+ }
+
+ static QColorMatrix null()
+ {
+ return { QColorVector::null(), QColorVector::null(), QColorVector::null() };
+ }
+ static QColorMatrix identity()
+ {
+ return { { 1.0f, 0.0f, 0.0f }, { 0.0f, 1.0f, 0.0f }, { 0.0f, 0.0f, 1.0f } };
+ }
+ static QColorMatrix toXyzFromSRgb()
+ {
+ return QColorMatrix { { 0.4360217452f, 0.2224751115f, 0.0139281144f },
+ { 0.3851087987f, 0.7169067264f, 0.0971015394f },
+ { 0.1430812478f, 0.0606181994f, 0.7141585946f } };
+ }
+ static QColorMatrix toXyzFromAdobeRgb()
+ {
+ return QColorMatrix { { 0.6097189188f, 0.3111021519f, 0.0194766335f },
+ { 0.2052682191f, 0.6256770492f, 0.0608891509f },
+ { 0.1492247432f, 0.0632209629f, 0.7448224425f } };
+ }
+ static QColorMatrix toXyzFromDciP3D65()
+ {
+ return QColorMatrix { { 0.5150973201f, 0.2411795557f, -0.0010491034f },
+ { 0.2919696569f, 0.6922441125f, 0.0418830328f },
+ { 0.1571449190f, 0.0665764511f, 0.7843542695f } };
+ }
+ static QColorMatrix toXyzFromProPhotoRgb()
+ {
+ return QColorMatrix { { 0.7976672649f, 0.2880374491f, 0.0000000000f },
+ { 0.1351922452f, 0.7118769884f, 0.0000000000f },
+ { 0.0313525312f, 0.0000856627f, 0.8251883388f } };
+ }
+ static QColorMatrix toXyzFromBt2020()
+ {
+ return QColorMatrix { { 0.6506130099f, 0.2695676684f, -0.0018652577f },
+ { 0.1865101457f, 0.6840794086f, 0.0172256753f },
+ { 0.1270887405f, 0.0463530831f, 0.8098278046f } };
+ }
+};
+
+inline bool operator==(const QColorMatrix &m1, const QColorMatrix &m2)
+{
+ return (m1.r == m2.r) && (m1.g == m2.g) && (m1.b == m2.b);
+}
+
+inline bool operator!=(const QColorMatrix &m1, const QColorMatrix &m2)
+{
+ return !(m1 == m2);
+}
+
+QT_END_NAMESPACE
+
+#endif // QCOLORMATRIX_P_H