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39 | |
40 | #ifndef QCOLORTRC_P_H |
41 | #define QCOLORTRC_P_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/private/qtguiglobal_p.h> |
55 | #include "qcolortransferfunction_p.h" |
56 | #include "qcolortransfertable_p.h" |
57 | |
58 | QT_BEGIN_NAMESPACE |
59 | |
60 | |
61 | // Defines an ICC TRC (Tone Reproduction Curve) |
62 | class Q_GUI_EXPORT QColorTrc |
63 | { |
64 | public: |
65 | QColorTrc() noexcept : m_type(Type::Uninitialized) |
66 | { } |
67 | QColorTrc(const QColorTransferFunction &fun) : m_type(Type::Function), m_fun(fun) |
68 | { } |
69 | QColorTrc(const QColorTransferTable &table) : m_type(Type::Table), m_table(table) |
70 | { } |
71 | |
72 | enum class Type { |
73 | Uninitialized, |
74 | Function, |
75 | Table |
76 | }; |
77 | |
78 | bool isLinear() const |
79 | { |
80 | return m_type == Type::Uninitialized || (m_type == Type::Function && m_fun.isLinear()); |
81 | } |
82 | bool isValid() const |
83 | { |
84 | return m_type != Type::Uninitialized; |
85 | } |
86 | float apply(float x) const |
87 | { |
88 | if (m_type == Type::Table) |
89 | return m_table.apply(x); |
90 | if (m_type == Type::Function) |
91 | return m_fun.apply(x); |
92 | return x; |
93 | } |
94 | float applyExtended(float x) const |
95 | { |
96 | if (x >= 0.0f && x <= 1.0f) |
97 | return apply(x); |
98 | if (m_type == Type::Function) |
99 | return std::copysign(x: m_fun.apply(x: std::abs(x: x)), y: x); |
100 | if (m_type == Type::Table) |
101 | return x < 0.0f ? 0.0f : 1.0f; |
102 | return x; |
103 | } |
104 | float applyInverse(float x) const |
105 | { |
106 | if (m_type == Type::Table) |
107 | return m_table.applyInverse(x); |
108 | if (m_type == Type::Function) |
109 | return m_fun.inverted().apply(x); |
110 | return x; |
111 | } |
112 | float applyInverseExtended(float x) const |
113 | { |
114 | if (x >= 0.0f && x <= 1.0f) |
115 | return applyInverse(x); |
116 | if (m_type == Type::Function) |
117 | return std::copysign(x: applyInverse(x: std::abs(x: x)), y: x); |
118 | if (m_type == Type::Table) |
119 | return x < 0.0f ? 0.0f : 1.0f; |
120 | return x; |
121 | } |
122 | |
123 | friend inline bool operator!=(const QColorTrc &o1, const QColorTrc &o2); |
124 | friend inline bool operator==(const QColorTrc &o1, const QColorTrc &o2); |
125 | |
126 | Type m_type; |
127 | QColorTransferFunction m_fun; |
128 | QColorTransferTable m_table; |
129 | }; |
130 | |
131 | inline bool operator!=(const QColorTrc &o1, const QColorTrc &o2) |
132 | { |
133 | if (o1.m_type != o2.m_type) |
134 | return true; |
135 | if (o1.m_type == QColorTrc::Type::Function) |
136 | return o1.m_fun != o2.m_fun; |
137 | if (o1.m_type == QColorTrc::Type::Table) |
138 | return o1.m_table != o2.m_table; |
139 | return false; |
140 | } |
141 | inline bool operator==(const QColorTrc &o1, const QColorTrc &o2) |
142 | { |
143 | return !(o1 != o2); |
144 | } |
145 | |
146 | QT_END_NAMESPACE |
147 | |
148 | #endif // QCOLORTRC |
149 | |