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39 | |
40 | #ifndef QCOLORMATRIX_H |
41 | #define QCOLORMATRIX_H |
42 | |
43 | // |
44 | // W A R N I N G |
45 | // ------------- |
46 | // |
47 | // This file is not part of the Qt API. It exists purely as an |
48 | // implementation detail. This header file may change from version to |
49 | // version without notice, or even be removed. |
50 | // |
51 | // We mean it. |
52 | // |
53 | |
54 | #include <QtGui/qtguiglobal.h> |
55 | #include <QtCore/qpoint.h> |
56 | #include <cmath> |
57 | |
58 | QT_BEGIN_NAMESPACE |
59 | |
60 | // An abstract 3 value color |
61 | class QColorVector |
62 | { |
63 | public: |
64 | QColorVector() = default; |
65 | Q_DECL_CONSTEXPR QColorVector(float x, float y, float z) : x(x), y(y), z(z) { } |
66 | explicit Q_DECL_CONSTEXPR QColorVector(const QPointF &chr) // from XY chromaticity |
67 | : x(chr.x() / chr.y()) |
68 | , y(1.0f) |
69 | , z((1.0 - chr.x() - chr.y()) / chr.y()) |
70 | { } |
71 | float x = 0.0f; // X, x or red |
72 | float y = 0.0f; // Y, y or green |
73 | float z = 0.0f; // Z, Y or blue |
74 | float _unused = 0.0f; |
75 | |
76 | friend inline bool operator==(const QColorVector &v1, const QColorVector &v2); |
77 | friend inline bool operator!=(const QColorVector &v1, const QColorVector &v2); |
78 | bool isNull() const |
79 | { |
80 | return !x && !y && !z; |
81 | } |
82 | |
83 | static bool isValidChromaticity(const QPointF &chr) |
84 | { |
85 | if (chr.x() < qreal(0.0) || chr.x() > qreal(1.0)) |
86 | return false; |
87 | if (chr.y() <= qreal(0.0) || chr.y() > qreal(1.0)) |
88 | return false; |
89 | if (chr.x() + chr.y() > qreal(1.0)) |
90 | return false; |
91 | return true; |
92 | } |
93 | |
94 | // Common whitepoints: |
95 | static Q_DECL_CONSTEXPR QPointF D50Chromaticity() { return QPointF(0.34567, 0.35850); } |
96 | static Q_DECL_CONSTEXPR QPointF D65Chromaticity() { return QPointF(0.31271, 0.32902); } |
97 | static Q_DECL_CONSTEXPR QColorVector D50() { return QColorVector(D50Chromaticity()); } |
98 | static Q_DECL_CONSTEXPR QColorVector D65() { return QColorVector(D65Chromaticity()); } |
99 | }; |
100 | |
101 | inline bool operator==(const QColorVector &v1, const QColorVector &v2) |
102 | { |
103 | return (std::abs(x: v1.x - v2.x) < (1.0f / 2048.0f)) |
104 | && (std::abs(x: v1.y - v2.y) < (1.0f / 2048.0f)) |
105 | && (std::abs(x: v1.z - v2.z) < (1.0f / 2048.0f)); |
106 | } |
107 | |
108 | inline bool operator!=(const QColorVector &v1, const QColorVector &v2) |
109 | { |
110 | return !(v1 == v2); |
111 | } |
112 | |
113 | |
114 | // A matrix mapping 3 value colors. |
115 | // Not using QMatrix because only floats are needed and performance is critical. |
116 | class QColorMatrix |
117 | { |
118 | public: |
119 | // We are storing the matrix transposed as that is more convenient: |
120 | QColorVector r; |
121 | QColorVector g; |
122 | QColorVector b; |
123 | |
124 | friend inline bool operator==(const QColorMatrix &m1, const QColorMatrix &m2); |
125 | friend inline bool operator!=(const QColorMatrix &m1, const QColorMatrix &m2); |
126 | |
127 | bool isNull() const |
128 | { |
129 | return r.isNull() && g.isNull() && b.isNull(); |
130 | } |
131 | bool isValid() const |
132 | { |
133 | // A color matrix must be invertible |
134 | float det = r.x * (b.z * g.y - g.z * b.y) - |
135 | r.y * (b.z * g.x - g.z * b.x) + |
136 | r.z * (b.y * g.x - g.y * b.x); |
137 | return !qFuzzyIsNull(f: det); |
138 | } |
139 | |
140 | QColorMatrix inverted() const |
141 | { |
142 | float det = r.x * (b.z * g.y - g.z * b.y) - |
143 | r.y * (b.z * g.x - g.z * b.x) + |
144 | r.z * (b.y * g.x - g.y * b.x); |
145 | det = 1.0f / det; |
146 | QColorMatrix inv; |
147 | inv.r.x = (g.y * b.z - b.y * g.z) * det; |
148 | inv.r.y = (b.y * r.z - r.y * b.z) * det; |
149 | inv.r.z = (r.y * g.z - g.y * r.z) * det; |
150 | inv.g.x = (b.x * g.z - g.x * b.z) * det; |
151 | inv.g.y = (r.x * b.z - b.x * r.z) * det; |
152 | inv.g.z = (g.x * r.z - r.x * g.z) * det; |
153 | inv.b.x = (g.x * b.y - b.x * g.y) * det; |
154 | inv.b.y = (b.x * r.y - r.x * b.y) * det; |
155 | inv.b.z = (r.x * g.y - g.x * r.y) * det; |
156 | return inv; |
157 | } |
158 | QColorMatrix operator*(const QColorMatrix &o) const |
159 | { |
160 | QColorMatrix comb; |
161 | comb.r.x = r.x * o.r.x + g.x * o.r.y + b.x * o.r.z; |
162 | comb.g.x = r.x * o.g.x + g.x * o.g.y + b.x * o.g.z; |
163 | comb.b.x = r.x * o.b.x + g.x * o.b.y + b.x * o.b.z; |
164 | |
165 | comb.r.y = r.y * o.r.x + g.y * o.r.y + b.y * o.r.z; |
166 | comb.g.y = r.y * o.g.x + g.y * o.g.y + b.y * o.g.z; |
167 | comb.b.y = r.y * o.b.x + g.y * o.b.y + b.y * o.b.z; |
168 | |
169 | comb.r.z = r.z * o.r.x + g.z * o.r.y + b.z * o.r.z; |
170 | comb.g.z = r.z * o.g.x + g.z * o.g.y + b.z * o.g.z; |
171 | comb.b.z = r.z * o.b.x + g.z * o.b.y + b.z * o.b.z; |
172 | return comb; |
173 | |
174 | } |
175 | QColorVector map(const QColorVector &c) const |
176 | { |
177 | return QColorVector { c.x * r.x + c.y * g.x + c.z * b.x, |
178 | c.x * r.y + c.y * g.y + c.z * b.y, |
179 | c.x * r.z + c.y * g.z + c.z * b.z }; |
180 | } |
181 | QColorMatrix transposed() const |
182 | { |
183 | return QColorMatrix { .r: { r.x, g.x, b.x }, |
184 | .g: { r.y, g.y, b.y }, |
185 | .b: { r.z, g.z, b.z } }; |
186 | } |
187 | |
188 | static QColorMatrix identity() |
189 | { |
190 | return { .r: { 1.0f, 0.0f, 0.0f }, .g: { 0.0f, 1.0f, 0.0f }, .b: { 0.0f, 0.0f, 1.0f } }; |
191 | } |
192 | static QColorMatrix fromScale(QColorVector v) |
193 | { |
194 | return QColorMatrix { .r: { v.x, 0.0f, 0.0f }, |
195 | .g: { 0.0f, v.y, 0.0f }, |
196 | .b: { 0.0f, 0.0f, v.z } }; |
197 | } |
198 | // These are used to recognize matrices from ICC profiles: |
199 | static QColorMatrix toXyzFromSRgb() |
200 | { |
201 | return QColorMatrix { .r: { 0.4360217452f, 0.2224751115f, 0.0139281144f }, |
202 | .g: { 0.3851087987f, 0.7169067264f, 0.0971015394f }, |
203 | .b: { 0.1430812478f, 0.0606181994f, 0.7141585946f } }; |
204 | } |
205 | static QColorMatrix toXyzFromAdobeRgb() |
206 | { |
207 | return QColorMatrix { .r: { 0.6097189188f, 0.3111021519f, 0.0194766335f }, |
208 | .g: { 0.2052682191f, 0.6256770492f, 0.0608891509f }, |
209 | .b: { 0.1492247432f, 0.0632209629f, 0.7448224425f } }; |
210 | } |
211 | static QColorMatrix toXyzFromDciP3D65() |
212 | { |
213 | return QColorMatrix { .r: { 0.5150973201f, 0.2411795557f, -0.0010491034f }, |
214 | .g: { 0.2919696569f, 0.6922441125f, 0.0418830328f }, |
215 | .b: { 0.1571449190f, 0.0665764511f, 0.7843542695f } }; |
216 | } |
217 | static QColorMatrix toXyzFromProPhotoRgb() |
218 | { |
219 | return QColorMatrix { .r: { 0.7976672649f, 0.2880374491f, 0.0000000000f }, |
220 | .g: { 0.1351922452f, 0.7118769884f, 0.0000000000f }, |
221 | .b: { 0.0313525312f, 0.0000856627f, 0.8251883388f } }; |
222 | } |
223 | }; |
224 | |
225 | inline bool operator==(const QColorMatrix &m1, const QColorMatrix &m2) |
226 | { |
227 | return (m1.r == m2.r) && (m1.g == m2.g) && (m1.b == m2.b); |
228 | } |
229 | |
230 | inline bool operator!=(const QColorMatrix &m1, const QColorMatrix &m2) |
231 | { |
232 | return !(m1 == m2); |
233 | } |
234 | |
235 | QT_END_NAMESPACE |
236 | |
237 | #endif // QCOLORMATRIX_P_H |
238 | |