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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 | ||
14b7602a JH |
17 | #include "color.h" |
18 | #include "led_tables.h" | |
19 | #include "progmem.h" | |
20 | ||
b624f32f | 21 | RGB hsv_to_rgb(HSV hsv) { |
22 | RGB rgb; | |
23 | uint8_t region, remainder, p, q, t; | |
24 | uint16_t h, s, v; | |
14b7602a | 25 | |
b624f32f | 26 | if (hsv.s == 0) { |
f11fde9b | 27 | #ifdef USE_CIE1931_CURVE |
b624f32f | 28 | rgb.r = rgb.g = rgb.b = pgm_read_byte(&CIE1931_CURVE[hsv.v]); |
f11fde9b | 29 | #else |
b624f32f | 30 | rgb.r = hsv.v; |
31 | rgb.g = hsv.v; | |
32 | rgb.b = hsv.v; | |
f11fde9b | 33 | #endif |
b624f32f | 34 | return rgb; |
35 | } | |
14b7602a | 36 | |
b624f32f | 37 | h = hsv.h; |
38 | s = hsv.s; | |
095b88bc X |
39 | #ifdef USE_CIE1931_CURVE |
40 | v = pgm_read_byte(&CIE1931_CURVE[hsv.v]); | |
41 | #else | |
b624f32f | 42 | v = hsv.v; |
095b88bc | 43 | #endif |
14b7602a | 44 | |
b624f32f | 45 | region = h * 6 / 255; |
46 | remainder = (h * 2 - region * 85) * 3; | |
14b7602a | 47 | |
b624f32f | 48 | p = (v * (255 - s)) >> 8; |
49 | q = (v * (255 - ((s * remainder) >> 8))) >> 8; | |
50 | t = (v * (255 - ((s * (255 - remainder)) >> 8))) >> 8; | |
14b7602a | 51 | |
b624f32f | 52 | switch (region) { |
53 | case 6: | |
54 | case 0: | |
55 | rgb.r = v; | |
56 | rgb.g = t; | |
57 | rgb.b = p; | |
58 | break; | |
59 | case 1: | |
60 | rgb.r = q; | |
61 | rgb.g = v; | |
62 | rgb.b = p; | |
63 | break; | |
64 | case 2: | |
65 | rgb.r = p; | |
66 | rgb.g = v; | |
67 | rgb.b = t; | |
68 | break; | |
69 | case 3: | |
70 | rgb.r = p; | |
71 | rgb.g = q; | |
72 | rgb.b = v; | |
73 | break; | |
74 | case 4: | |
75 | rgb.r = t; | |
76 | rgb.g = p; | |
77 | rgb.b = v; | |
78 | break; | |
79 | default: | |
80 | rgb.r = v; | |
81 | rgb.g = p; | |
82 | rgb.b = q; | |
83 | break; | |
84 | } | |
14b7602a | 85 | |
b624f32f | 86 | return rgb; |
14b7602a | 87 | } |