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Diffstat (limited to 'src/gui/painting/qcolormatrix_p.h')
-rw-r--r-- | src/gui/painting/qcolormatrix_p.h | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/src/gui/painting/qcolormatrix_p.h b/src/gui/painting/qcolormatrix_p.h new file mode 100644 index 0000000000..3d1dca6222 --- /dev/null +++ b/src/gui/painting/qcolormatrix_p.h @@ -0,0 +1,214 @@ +/**************************************************************************** +** +** 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 |