tsiry-sandratraina.com
A modern Music Player Daemon based on Rockbox open source high quality audio player
libadwaita
audio
rust
zig
deno
mpris
rockbox
mpd
1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (C) 2006 Antoine Cellerier <dionoea -at- videolan -dot- org>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
19 *
20 ****************************************************************************/
21
22#include "rgb_hsv.h"
23
24/***********************************************************************
25 * Colorspace transformations
26 ***********************************************************************
27 * r, g and b range from 0 to 255
28 * h ranges from 0 to 3599 (which in fact means 0.0 to 359.9).
29 * 360 is the same as 0 (it loops)
30 * s and v range from 0 to 255 (which in fact means 0.00 to 1.00)
31 ***********************************************************************/
32
33void rgb2hsv( int r, int g, int b, int *h, int *s, int *v )
34{
35 int max;
36 int min;
37
38 max = r > g ? r : g;
39 if( b > max ) max = b;
40
41 min = r < g ? r : g;
42 if( b < min ) min = b;
43
44 if( max == 0 )
45 {
46 *v = 0;
47 *h = 0; *s = 0; /* Random since it's black */
48 return;
49 }
50 else if( max == min )
51 {
52 *h = 0; /* Random since it's gray */
53 }
54 else if( max == r && g >= b )
55 {
56 *h = ( 10 * 60 * ( g - b )/( max - min ) );
57 }
58 else if( max == r && g < b )
59 {
60 *h = ( 10 * ( 60 * ( g - b )/( max - min ) + 360 ));
61 }
62 else if( max == g )
63 {
64 *h = ( 10 * ( 60 * ( b - r )/( max - min ) + 120 ));
65 }
66 else// if( max == b )
67 {
68 *h = ( 10 * ( 60 * ( r - g )/( max - min ) + 240 ));
69 }
70
71 /* Just in case ? */
72 while( *h < 0 ) *h += 3600;
73 while( *h >= 3600 ) *h-= 3600;
74
75 *s = (( max - min )*255)/max;
76 *v = max;
77}
78
79void hsv2rgb( int h, int s, int v, int *r, int *g, int *b )
80{
81 int f, p, q, t;
82 while( h < 0 ) h += 3600;
83 while( h >= 3600 ) h-= 3600;
84 f = h%600;
85 p = ( v * ( 255 - s ) ) / ( 255 );
86 q = ( v * ( 600*255 - f*s ) ) / ( 255 * 600 );
87 t = ( v * ( 600*255 - ( 600 - f ) * s ) ) / ( 255 * 600 );
88
89
90 if( s == 0 ) /* gray */
91 {
92 *r = v;
93 *g = *r;
94 *b = *r;
95 return;
96 }
97
98 switch( h/600 )
99 {
100 case 0:
101 *r = v;
102 *g = t;
103 *b = p;
104 break;
105 case 1:
106 *r = q;
107 *g = v;
108 *b = p;
109 break;
110 case 2:
111 *r = p;
112 *g = v;
113 *b = t;
114 break;
115 case 3:
116 *r = p;
117 *g = q;
118 *b = v;
119 break;
120 case 4:
121 *r = t;
122 *g = p;
123 *b = v;
124 break;
125 case 5:
126 *r = v;
127 *g = p;
128 *b = q;
129 break;
130 }
131}