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
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*
/--------------------------------------------------------------------
|
| $Id: plhsvconvert.cpp,v 1.3 2004/09/11 12:41:36 uzadow Exp $
|
| Copyright (c) 1996-2002 Ulrich von Zadow
|
\--------------------------------------------------------------------
*/
#include "plhsvconvert.h"
void fp_rgb_to_hsv (double *r,
double *g,
double *b)
{
int red, green, blue;
double h=0, s, v;
int min, max;
int delta;
red = (int)*r;
green = (int)*g;
blue = (int)*b;
if (red > green)
{
if (red > blue)
max = red;
else
max = blue;
if (green < blue)
min = green;
else
min = blue;
}
else
{
if (green > blue)
max = green;
else
max = blue;
if (red < blue)
min = red;
else
min = blue;
}
v = max;
if (max != 0)
s = ((max - min) * 255) / (double) max;
else
s = 0;
if (s == 0)
h = 0;
else
{
delta = max - min;
if (red == max)
h = (green - blue) / (double) delta;
else if (green == max)
h = 2 + (blue - red) / (double) delta;
else if (blue == max)
h = 4 + (red - green) / (double) delta;
h *= 42.5;
if (h < 0)
h += 255;
if (h > 255)
h -= 255;
}
*r = h;
*g = s;
*b = v;
}
void fp_hsv_to_rgb (double *h,
double *s,
double *v)
{
double hue, saturation, value;
double f, p, q, t;
if (((int)*s) == 0)
{
*h = *v;
*s = *v;
*v = *v;
}
else
{
hue = *h * 6.0 / 255.0;
saturation = *s / 255.0;
value = *v / 255.0;
f = hue - (int) hue;
p = value * (1.0 - saturation);
q = value * (1.0 - (saturation * f));
t = value * (1.0 - (saturation * (1.0 - f)));
switch ((int) hue)
{
case 0:
*h = value * 255.0;
*s = t * 255.0;
*v = p * 255.0;
break;
case 1:
*h = q * 255.0;
*s = value * 255.0;
*v = p * 255.0;
break;
case 2:
*h = p * 255.0;
*s = value * 255.0;
*v = t * 255.0;
break;
case 3:
*h = p * 255.0;
*s = q * 255.0;
*v = value * 255.0;
break;
case 4:
*h = t * 255.0;
*s = p * 255.0;
*v = value * 255.0;
break;
case 5:
*h = value * 255.0;
*s = p * 255.0;
*v = q * 255.0;
break;
}
}
}
/*
/--------------------------------------------------------------------
|
| $Log: plhsvconvert.cpp,v $
| Revision 1.3 2004/09/11 12:41:36 uzadow
| removed plstdpch.h
|
| Revision 1.2 2002/03/31 13:36:42 uzadow
| Updated copyright.
|
| Revision 1.1 2001/09/16 19:03:23 uzadow
| Added global name prefix PL, changed most filenames.
|
| Revision 1.1 2000/10/12 21:56:12 uzadow
| Moved local functions from VideoInvertFilter.cpp to
| hsvconvert.*
|
|
|
\--------------------------------------------------------------------
*/
|
