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| |
| #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 <QtCore/qpoint.h> |
| #include <cmath> |
| |
| QT_BEGIN_NAMESPACE |
| |
| // An abstract 3 value color |
| class QColorVector |
| { |
| public: |
| QColorVector() = default; |
| Q_DECL_CONSTEXPR QColorVector(float x, float y, float z) : x(x), y(y), z(z) { } |
| explicit Q_DECL_CONSTEXPR QColorVector(const QPointF &chr) // from XY chromaticity |
| : x(chr.x() / chr.y()) |
| , y(1.0f) |
| , z((1.0 - chr.x() - chr.y()) / chr.y()) |
| { } |
| float x = 0.0f; // X, x or red |
| float y = 0.0f; // Y, y or green |
| float z = 0.0f; // Z, Y or blue |
| float _unused = 0.0f; |
| |
| friend inline bool operator==(const QColorVector &v1, const QColorVector &v2); |
| friend inline bool operator!=(const QColorVector &v1, const QColorVector &v2); |
| bool isNull() const |
| { |
| return !x && !y && !z; |
| } |
| |
| static bool isValidChromaticity(const QPointF &chr) |
| { |
| if (chr.x() < qreal(0.0) || chr.x() > qreal(1.0)) |
| return false; |
| if (chr.y() <= qreal(0.0) || chr.y() > qreal(1.0)) |
| return false; |
| if (chr.x() + chr.y() > qreal(1.0)) |
| return false; |
| return true; |
| } |
| |
| // Common whitepoints: |
| static Q_DECL_CONSTEXPR QPointF D50Chromaticity() { return QPointF(0.34567, 0.35850); } |
| static Q_DECL_CONSTEXPR QPointF D65Chromaticity() { return QPointF(0.31271, 0.32902); } |
| static Q_DECL_CONSTEXPR QColorVector D50() { return QColorVector(D50Chromaticity()); } |
| static Q_DECL_CONSTEXPR QColorVector D65() { return QColorVector(D65Chromaticity()); } |
| }; |
| |
| 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 isNull() const |
| { |
| return r.isNull() && g.isNull() && b.isNull(); |
| } |
| 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 identity() |
| { |
| return { { 1.0f, 0.0f, 0.0f }, { 0.0f, 1.0f, 0.0f }, { 0.0f, 0.0f, 1.0f } }; |
| } |
| static QColorMatrix fromScale(QColorVector v) |
| { |
| return QColorMatrix { { v.x, 0.0f, 0.0f }, |
| { 0.0f, v.y, 0.0f }, |
| { 0.0f, 0.0f, v.z } }; |
| } |
| // These are used to recognize matrices from ICC profiles: |
| 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 } }; |
| } |
| }; |
| |
| 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 |