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
|
/* Copyright 2017 Jason Williams
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "color.h"
#include "led_tables.h"
#include "progmem.h"
RGB hsv_to_rgb_impl(HSV hsv, bool use_cie) {
RGB rgb;
uint8_t region, remainder, p, q, t;
uint16_t h, s, v;
if (hsv.s == 0) {
#ifdef USE_CIE1931_CURVE
if (use_cie) {
rgb.r = rgb.g = rgb.b = pgm_read_byte(&CIE1931_CURVE[hsv.v]);
} else {
rgb.r = hsv.v;
rgb.g = hsv.v;
rgb.b = hsv.v;
}
#else
rgb.r = hsv.v;
rgb.g = hsv.v;
rgb.b = hsv.v;
#endif
return rgb;
}
h = hsv.h;
s = hsv.s;
#ifdef USE_CIE1931_CURVE
if (use_cie) {
v = pgm_read_byte(&CIE1931_CURVE[hsv.v]);
} else {
v = hsv.v;
}
#else
v = hsv.v;
#endif
region = h * 6 / 255;
remainder = (h * 2 - region * 85) * 3;
p = (v * (255 - s)) >> 8;
q = (v * (255 - ((s * remainder) >> 8))) >> 8;
t = (v * (255 - ((s * (255 - remainder)) >> 8))) >> 8;
switch (region) {
case 6:
case 0:
rgb.r = v;
rgb.g = t;
rgb.b = p;
break;
case 1:
rgb.r = q;
rgb.g = v;
rgb.b = p;
break;
case 2:
rgb.r = p;
rgb.g = v;
rgb.b = t;
break;
case 3:
rgb.r = p;
rgb.g = q;
rgb.b = v;
break;
case 4:
rgb.r = t;
rgb.g = p;
rgb.b = v;
break;
default:
rgb.r = v;
rgb.g = p;
rgb.b = q;
break;
}
return rgb;
}
RGB hsv_to_rgb(HSV hsv) {
#ifdef USE_CIE1931_CURVE
return hsv_to_rgb_impl(hsv, true);
#else
return hsv_to_rgb_impl(hsv, false);
#endif
}
RGB hsv_to_rgb_nocie(HSV hsv) {
return hsv_to_rgb_impl(hsv, false);
}
#ifdef RGBW
# ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
# endif
void convert_rgb_to_rgbw(LED_TYPE *led) {
// Determine lowest value in all three colors, put that into
// the white channel and then shift all colors by that amount
led->w = MIN(led->r, MIN(led->g, led->b));
led->r -= led->w;
led->g -= led->w;
led->b -= led->w;
}
#endif
|
