1 #include <kms++util/color.h>
2
3 namespace kms
4 {
RGB()5 RGB::RGB()
6 {
7 r = g = b = 0;
8 a = 255;
9 }
10
RGB(uint8_t r,uint8_t g,uint8_t b)11 RGB::RGB(uint8_t r, uint8_t g, uint8_t b)
12 :RGB(255, r, g, b)
13 {
14 }
15
RGB(uint8_t a,uint8_t r,uint8_t g,uint8_t b)16 RGB::RGB(uint8_t a, uint8_t r, uint8_t g, uint8_t b)
17 {
18 this->r = r;
19 this->g = g;
20 this->b = b;
21 this->a = a;
22 }
23
RGB(uint32_t argb)24 RGB::RGB(uint32_t argb)
25 {
26 this->b = (argb >> 0) & 0xff;
27 this->g = (argb >> 8) & 0xff;
28 this->r = (argb >> 16) & 0xff;
29 this->a = (argb >> 24) & 0xff;
30 }
31
rgb888() const32 uint32_t RGB::rgb888() const
33 {
34 return (r << 16) | (g << 8) | (b << 0);
35 }
36
bgr888() const37 uint32_t RGB::bgr888() const
38 {
39 return (b << 16) | (g << 8) | (r << 0);
40 }
41
argb8888() const42 uint32_t RGB::argb8888() const
43 {
44 return (a << 24) | (r << 16) | (g << 8) | (b << 0);
45 }
46
abgr8888() const47 uint32_t RGB::abgr8888() const
48 {
49 return (a << 24) | (b << 16) | (g << 8) | (r << 0);
50 }
51
rgb565() const52 uint16_t RGB::rgb565() const
53 {
54 return ((r >> 3) << 11) | ((g >> 2) << 5) | ((b >> 3) << 0);
55 }
56
bgr565() const57 uint16_t RGB::bgr565() const
58 {
59 return ((b >> 3) << 11) | ((g >> 2) << 5) | ((r >> 3) << 0);
60 }
61
yuv(YUVType type) const62 YUV RGB::yuv(YUVType type) const
63 {
64 return YUV(*this, type);
65 }
66
67 #define CF_ONE (256)
68 #define CF(a, b, c) { ((int) ((a) * CF_ONE)), ((int) ((b) * CF_ONE)), ((int) ((c) * CF_ONE)) }
69 #define CLAMP(a) ((a) > (CF_ONE-1) ? (CF_ONE-1) : (a) < 0 ? 0 : (a))
70
71 const int YUVcoef[static_cast<unsigned>(YUVType::MAX)][3][3] = {
72 [static_cast<unsigned>(YUVType::BT601_Lim)] = {
73 CF( 0.257, 0.504, 0.098),
74 CF(-0.148, -0.291, 0.439),
75 CF( 0.439, -0.368, -0.071) },
76 [static_cast<unsigned>(YUVType::BT601_Full)] = {
77 CF( 0.299, 0.587, 0.114),
78 CF(-0.169, -0.331, 0.500),
79 CF( 0.500, -0.419, -0.081) },
80 [static_cast<unsigned>(YUVType::BT709_Lim)] = {
81 CF( 0.1826, 0.6142, 0.0620),
82 CF(-0.1006, -0.3386, 0.4392),
83 CF( 0.4392, -0.3989, -0.0403) },
84 [static_cast<unsigned>(YUVType::BT709_Full)] = {
85 CF( 0.2126, 0.7152, 0.0722),
86 CF(-0.1146, -0.3854, 0.5000),
87 CF( 0.5000, -0.4542, -0.0468) },
88 };
89
90 const int YUVoffset[static_cast<unsigned>(YUVType::MAX)][3] = {
91 [static_cast<unsigned>(YUVType::BT601_Lim)] = CF(0.0625, 0.5, 0.5),
92 [static_cast<unsigned>(YUVType::BT601_Full)] = CF( 0, 0.5, 0.5),
93 [static_cast<unsigned>(YUVType::BT709_Lim)] = CF(0.0625, 0.5, 0.5),
94 [static_cast<unsigned>(YUVType::BT709_Full)] = CF( 0, 0.5, 0.5),
95 };
96
YUV()97 YUV::YUV()
98 {
99 y = u = v = a = 0;
100 }
101
YUV(uint8_t y,uint8_t u,uint8_t v)102 YUV::YUV(uint8_t y, uint8_t u, uint8_t v)
103 {
104 this->y = y;
105 this->u = u;
106 this->v = v;
107 this->a = 0;
108 }
109
110 static inline
MAKE_YUV_Y(uint8_t r,uint8_t g,uint8_t b,YUVType type)111 uint8_t MAKE_YUV_Y(uint8_t r, uint8_t g, uint8_t b, YUVType type)
112 {
113 unsigned tidx = static_cast<unsigned>(type);
114
115 return CLAMP(((YUVcoef[tidx][0][0] * r + YUVcoef[tidx][0][1] * g +
116 YUVcoef[tidx][0][2] * b + CF_ONE/2) / CF_ONE) +
117 YUVoffset[tidx][0]);
118 }
119
120 static inline
MAKE_YUV_U(uint8_t r,uint8_t g,uint8_t b,YUVType type)121 uint8_t MAKE_YUV_U(uint8_t r, uint8_t g, uint8_t b, YUVType type)
122 {
123 unsigned tidx = static_cast<unsigned>(type);
124
125 return CLAMP(((YUVcoef[tidx][1][0] * r + YUVcoef[tidx][1][1] * g +
126 YUVcoef[tidx][1][2] * b + CF_ONE/2) / CF_ONE) +
127 YUVoffset[tidx][1]);
128 }
129
130 static inline
MAKE_YUV_V(uint8_t r,uint8_t g,uint8_t b,YUVType type)131 uint8_t MAKE_YUV_V(uint8_t r, uint8_t g, uint8_t b, YUVType type)
132 {
133 unsigned tidx = static_cast<unsigned>(type);
134
135 return CLAMP(((YUVcoef[tidx][2][0] * r + YUVcoef[tidx][2][1] * g +
136 YUVcoef[tidx][2][2] * b + CF_ONE/2) / CF_ONE) +
137 YUVoffset[tidx][2]);
138 }
139
YUV(const RGB & rgb,YUVType type)140 YUV::YUV(const RGB& rgb, YUVType type)
141 {
142 this->y = MAKE_YUV_Y(rgb.r, rgb.g, rgb.b, type);
143 this->u = MAKE_YUV_U(rgb.r, rgb.g, rgb.b, type);
144 this->v = MAKE_YUV_V(rgb.r, rgb.g, rgb.b, type);
145 this->a = rgb.a;
146 }
147 }
148