1 |
/* RCSid $Id: ccolor.h,v 3.9 2023/11/15 18:02:52 greg Exp $ */ |
2 |
/* |
3 |
* Header file for spectral colors. |
4 |
* |
5 |
*/ |
6 |
|
7 |
#ifndef _MGF_COLOR_H_ |
8 |
#define _MGF_COLOR_H_ |
9 |
#ifdef __cplusplus |
10 |
extern "C" { |
11 |
#endif |
12 |
|
13 |
#define C_CMINWL 380 /* minimum wavelength */ |
14 |
#define C_CMAXWL 780 /* maximum wavelength */ |
15 |
#define C_CNSS 41 /* number of spectral samples */ |
16 |
#define C_CWLI ((C_CMAXWL-C_CMINWL)/(C_CNSS-1)) |
17 |
#define C_CMAXV 10000 /* nominal maximum sample value */ |
18 |
#define C_CLPWM (683./C_CMAXV) /* peak lumens/watt multiplier */ |
19 |
|
20 |
#define C_CSSPEC 01 /* flag if spectrum is set */ |
21 |
#define C_CDSPEC 02 /* flag if defined w/ spectrum */ |
22 |
#define C_CSXY 04 /* flag if xy is set */ |
23 |
#define C_CDXY 010 /* flag if defined w/ xy */ |
24 |
#define C_CSEFF 020 /* flag if efficacy set */ |
25 |
|
26 |
typedef struct { |
27 |
int clock; /* incremented each change */ |
28 |
void *client_data; /* pointer to private client-owned data */ |
29 |
short flags; /* what's been set and how */ |
30 |
short ssamp[C_CNSS]; /* spectral samples, min wl to max */ |
31 |
long ssum; /* straight sum of spectral values */ |
32 |
float cx, cy; /* xy chromaticity value */ |
33 |
float eff; /* efficacy (lumens/watt) */ |
34 |
} C_COLOR; |
35 |
|
36 |
typedef unsigned short C_CHROMA; /* encoded (x,y) chromaticity */ |
37 |
|
38 |
#define C_DEFCOLOR { 1, NULL, C_CDXY|C_CSXY|C_CSSPEC|C_CSEFF,\ |
39 |
{C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
40 |
C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
41 |
C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
42 |
C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
43 |
C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
44 |
C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
45 |
C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV},\ |
46 |
(long)C_CNSS*C_CMAXV, 1./3., 1./3., 178.006 } |
47 |
|
48 |
#define c_cval(c,l) ((c)->ssamp[((l)+(.5*C_CWLI-C_MINWL))/C_CWLI] \ |
49 |
/ (double)(c)->ssum) |
50 |
|
51 |
extern const C_COLOR c_dfcolor; /* default color */ |
52 |
extern const C_CHROMA c_dfchroma; /* c_encodeChroma(&c_dfcolor) */ |
53 |
|
54 |
extern const C_COLOR c_x31, c_y31, c_z31; /* 1931 standard observer */ |
55 |
|
56 |
/* set CIE (x,y) chromaticity */ |
57 |
#define c_cset(c,x,y) ((c)->cx=(x),(c)->cy=(y),(c)->flags=C_CDXY|C_CSXY) |
58 |
|
59 |
/* set black body spectrum */ |
60 |
extern int c_bbtemp(C_COLOR *clr, double tk); |
61 |
/* assign arbitrary spectrum */ |
62 |
extern double c_sset(C_COLOR *clr, double wlmin, double wlmax, |
63 |
const float spec[], int nwl); |
64 |
extern void c_ccvt(C_COLOR *clr, int fl); /* fix color representation */ |
65 |
/* are colors equivalent? */ |
66 |
extern int c_equiv(C_COLOR *c1, C_COLOR *c2); |
67 |
extern int c_isgrey(C_COLOR *clr); /* check if color is grey */ |
68 |
/* mix two colors */ |
69 |
extern void c_cmix(C_COLOR *cres, double w1, C_COLOR *c1, |
70 |
double w2, C_COLOR *c2); |
71 |
/* multiply two colors */ |
72 |
extern double c_cmult(C_COLOR *cres, C_COLOR *c1, double y1, |
73 |
C_COLOR *c2, double y2); |
74 |
/* convert to sharpened RGB */ |
75 |
extern void c_toSharpRGB(C_COLOR *cin, double cieY, float cout[3]); |
76 |
/* convert from sharpened RGB */ |
77 |
extern double c_fromSharpRGB(float cin[3], C_COLOR *cout); |
78 |
/* encode (x,y) chromaticity */ |
79 |
extern C_CHROMA c_encodeChroma(C_COLOR *clr); |
80 |
/* decode (x,y) chromaticity */ |
81 |
extern void c_decodeChroma(C_COLOR *cres, C_CHROMA ccode); |
82 |
|
83 |
#ifdef _RAD_COLOR_H_ |
84 |
/* The following four routines are defined in ccyrgb.c */ |
85 |
/* convert to RGB color */ |
86 |
extern void ccy2rgb(C_COLOR *cin, double cieY, COLOR cout); |
87 |
/* convert from RGB color */ |
88 |
extern double rgb2ccy(COLOR cin, C_COLOR *cout); |
89 |
/* convert to spectral color */ |
90 |
extern void ccy2scolor(C_COLOR *cin, double cieY, SCOLOR sco); |
91 |
/* convert from spectral color */ |
92 |
extern double scolor2ccy(SCOLOR sci, C_COLOR *cout); |
93 |
|
94 |
#endif /* _RAD_COLOR_H_ */ |
95 |
|
96 |
#ifdef __cplusplus |
97 |
} |
98 |
#endif |
99 |
#endif /* _MGF_COLOR_H_ */ |