1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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 <QtCore/private/qglobal_p.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) { }
explicit 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 constexpr QPointF D50Chromaticity() { return QPointF(0.34567, 0.35850); }
static constexpr QPointF D65Chromaticity() { return QPointF(0.31271, 0.32902); }
static constexpr QColorVector D50() { return QColorVector(D50Chromaticity()); }
static 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 QTransform 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);
}
bool isIdentity() const noexcept
{
return *this == identity();
}
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
|
