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
|
#pragma once
#include <Cplt/Utils/Math.hpp>
#include <Cplt/Utils/Vector.hpp>
#include <Cplt/Utils/fwd.hpp>
#include <imgui.h>
#include <algorithm>
#include <cstdint>
#include <limits>
class RgbaColor {
public:
uint8_t r;
uint8_t g;
uint8_t b;
uint8_t a;
public:
constexpr RgbaColor() noexcept
: r{ 255 }
, g{ 255 }
, b{ 255 }
, a{ 255 } {
}
constexpr RgbaColor(float r, float g, float b, float a = 1.0f) noexcept
: r{ static_cast<uint8_t>(r * 255.0f) }
, g{ static_cast<uint8_t>(g * 255.0f) }
, b{ static_cast<uint8_t>(b * 255.0f) }
, a{ static_cast<uint8_t>(a * 255.0f) } {
}
constexpr RgbaColor(int r, int g, int b, int a = 255) noexcept
: r{ static_cast<uint8_t>(r & 0xFF) }
, g{ static_cast<uint8_t>(g & 0xFF) }
, b{ static_cast<uint8_t>(b & 0xFF) }
, a{ static_cast<uint8_t>(a & 0xFF) } {
}
constexpr RgbaColor(uint32_t rgba) noexcept
: r{ static_cast<uint8_t>((rgba >> 0) & 0xFF) }
, g{ static_cast<uint8_t>((rgba >> 8) & 0xFF) }
, b{ static_cast<uint8_t>((rgba >> 16) & 0xFF) }
, a{ static_cast<uint8_t>((rgba >> 24) & 0xFF) } {
}
constexpr uint32_t GetScalar() const noexcept {
uint32_t res = 0;
res |= r << 24;
res |= g << 16;
res |= b << 8;
res |= a;
return res;
}
constexpr void SetScalar(uint32_t scalar) noexcept {
r = (scalar >> 0) & 0xFF;
g = (scalar >> 8) & 0xFF;
b = (scalar >> 16) & 0xFF;
a = (scalar >> 24) & 0xFF;
}
constexpr float GetNormalizedRed() const noexcept {
return r / 255.0f;
}
constexpr float GetNormalizedGreen() const noexcept {
return g / 255.0f;
}
constexpr float GetNormalizedBlue() const noexcept {
return b / 255.0f;
}
constexpr float GetNormalizedAlpha() const noexcept {
return a / 255.0f;
}
constexpr Vec4i AsVec4i() const noexcept {
return Vec4i{ r, g, b, a };
}
constexpr Vec4f AsVec4f() const noexcept {
return Vec4f{
GetNormalizedRed(),
GetNormalizedGreen(),
GetNormalizedBlue(),
GetNormalizedAlpha(),
};
}
ImVec4 AsImVec() const {
auto v = AsVec4f();
return ImVec4{ v.x, v.y, v.z, v.w };
}
ImColor AsImColor() const {
auto v = AsVec4f();
return ImColor{ v.x, v.y, v.z, v.w };
}
ImU32 AsImU32() const {
ImU32 res;
res |= r << IM_COL32_R_SHIFT;
res |= g << IM_COL32_G_SHIFT;
res |= b << IM_COL32_B_SHIFT;
res |= a << IM_COL32_A_SHIFT;
return res;
}
constexpr void SetVec(const Vec4f& vec) noexcept {
r = (uint8_t)(vec.x * 255.0f);
g = (uint8_t)(vec.y * 255.0f);
b = (uint8_t)(vec.z * 255.0f);
a = (uint8_t)(vec.w * 255.0f);
}
// Forward declaring because cyclic reference between RgbaColor and HsvColor
constexpr HsvColor ToHsv() const noexcept;
friend constexpr bool operator==(const RgbaColor&, const RgbaColor&) noexcept = default;
};
class HsvColor {
public:
float h;
float s;
float v;
float a;
public:
constexpr HsvColor() noexcept
: h{ 0.0f }
, s{ 0.0f }
, v{ 1.0f }
, a{ 1.0f } {
}
constexpr HsvColor(float h, float s, float v, float a) noexcept
: h{ h }
, s{ s }
, v{ v }
, a{ a } {
}
// Forward declaring because cyclic reference between RgbaColor and HsvColor
constexpr RgbaColor ToRgba() const noexcept;
};
constexpr HsvColor RgbaColor::ToHsv() const noexcept {
float fr = GetNormalizedRed();
float fg = GetNormalizedBlue();
float fb = GetNormalizedGreen();
float fa = GetNormalizedAlpha();
auto p = fg < fb ? Vec4f{ fb, fg, -1, 2.0f / 3.0f } : Vec4f{ fg, fb, 0, -1.0f / 3.0f };
auto q = fr < p.x ? Vec4f{ p.x, p.y, p.w, fr } : Vec4f{ fr, p.y, p.z, p.x };
float c = q.x - std::min(q.w, q.y);
float h = MathUtils::Abs((q.w - q.y) / (6 * c + std::numeric_limits<float>::epsilon()) + q.z);
Vec3f hcv{ h, c, q.x };
float s = hcv.y / (hcv.z + std::numeric_limits<float>::epsilon());
return HsvColor(hcv.x, s, hcv.z, fa);
}
constexpr RgbaColor HsvColor::ToRgba() const noexcept {
float r = MathUtils::Abs(h * 6 - 3) - 1;
float g = 2 - MathUtils::Abs(h * 6 - 2);
float b = 2 - MathUtils::Abs(h * 6 - 4);
auto rgb = Vec3f{
std::clamp(r, 0.0f, 1.0f),
std::clamp(g, 0.0f, 1.0f),
std::clamp(b, 0.0f, 1.0f),
};
auto vc = (rgb - Vec3f{ 0, 0, 0 }) * s + Vec3f{ 1, 1, 1 } * v;
return RgbaColor(vc.x, vc.y, vc.z, a);
}
|
