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14b7602a JH |
1 | /* Copyright 2017 Jason Williams |
2 | * | |
3 | * This program is free software: you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation, either version 2 of the License, or | |
6 | * (at your option) any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | ||
17 | ||
18 | #include "color.h" | |
19 | #include "led_tables.h" | |
20 | #include "progmem.h" | |
21 | ||
22 | RGB hsv_to_rgb( HSV hsv ) | |
23 | { | |
24 | RGB rgb; | |
12a07dae X |
25 | uint8_t region, remainder, p, q, t; |
26 | uint16_t h, s, v; | |
14b7602a JH |
27 | |
28 | if ( hsv.s == 0 ) | |
29 | { | |
30 | rgb.r = hsv.v; | |
31 | rgb.g = hsv.v; | |
32 | rgb.b = hsv.v; | |
33 | return rgb; | |
34 | } | |
35 | ||
36 | h = hsv.h; | |
37 | s = hsv.s; | |
38 | v = hsv.v; | |
39 | ||
12a07dae X |
40 | region = h * 6 / 255; |
41 | remainder = (h * 2 - region * 85) * 3; | |
14b7602a JH |
42 | |
43 | p = (v * (255 - s)) >> 8; | |
44 | q = (v * (255 - ((s * remainder) >> 8))) >> 8; | |
45 | t = (v * (255 - ((s * (255 - remainder)) >> 8))) >> 8; | |
46 | ||
47 | switch ( region ) | |
48 | { | |
12a07dae | 49 | case 6: |
14b7602a JH |
50 | case 0: |
51 | rgb.r = v; | |
52 | rgb.g = t; | |
53 | rgb.b = p; | |
54 | break; | |
55 | case 1: | |
56 | rgb.r = q; | |
57 | rgb.g = v; | |
58 | rgb.b = p; | |
59 | break; | |
60 | case 2: | |
61 | rgb.r = p; | |
62 | rgb.g = v; | |
63 | rgb.b = t; | |
64 | break; | |
65 | case 3: | |
66 | rgb.r = p; | |
67 | rgb.g = q; | |
68 | rgb.b = v; | |
69 | break; | |
70 | case 4: | |
71 | rgb.r = t; | |
72 | rgb.g = p; | |
73 | rgb.b = v; | |
74 | break; | |
75 | default: | |
76 | rgb.r = v; | |
77 | rgb.g = p; | |
78 | rgb.b = q; | |
79 | break; | |
80 | } | |
81 | ||
c98247e3 | 82 | #ifdef USE_CIE1931_CURVE |
14b7602a JH |
83 | rgb.r = pgm_read_byte( &CIE1931_CURVE[rgb.r] ); |
84 | rgb.g = pgm_read_byte( &CIE1931_CURVE[rgb.g] ); | |
85 | rgb.b = pgm_read_byte( &CIE1931_CURVE[rgb.b] ); | |
c98247e3 | 86 | #endif |
14b7602a JH |
87 | |
88 | return rgb; | |
89 | } | |
90 |