File: C:/Users/fred/anaconda3/Library/include/qt/QtGui/5.15.2/QtGui/private/qcolormatrix_p.h
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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