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root/radiance/ray/src/common/ccolor.h
Revision: 3.6
Committed: Tue Jun 26 17:59:16 2012 UTC (11 years, 9 months ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: rad4R2P2, rad4R2, rad4R2P1
Changes since 3.5: +4 -2 lines
Log Message:
Made CIE 1931 curves external

File Contents

# Content
1 /* RCSid $Id: ccolor.h,v 3.5 2012/05/18 20:43:13 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 #define C_DEFCOLOR { 1, NULL, C_CDXY|C_CSXY|C_CSSPEC|C_CSEFF,\
37 {C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\
38 C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\
39 C_CMAXV,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 (long)C_CNSS*C_CMAXV, 1./3., 1./3., 178.006 }
45
46 #define c_cval(c,l) ((c)->ssamp[((l)+(C_CWLI/2.-C_MINWL))/C_CWLI] \
47 / (double)(c)->ssum)
48
49 extern const C_COLOR c_dfcolor; /* default color */
50
51 extern const C_COLOR c_x31, c_y31, c_z31; /* 1931 standard observer */
52
53 /* set CIE (x,y) chromaticity */
54 #define c_cset(c,x,y) ((c)->cx=(x),(c)->cy=(y),(c)->flags=C_CDXY|C_CSXY)
55
56 /* set black body spectrum */
57 extern int c_bbtemp(C_COLOR *clr, double tk);
58 /* assign arbitrary spectrum */
59 extern double c_sset(C_COLOR *clr, double wlmin, double wlmax,
60 const float spec[], int nwl);
61 extern void c_ccvt(C_COLOR *clr, int fl); /* fix color representation */
62 extern int c_isgrey(C_COLOR *clr); /* check if color is grey */
63 /* mix two colors */
64 extern void c_cmix(C_COLOR *cres, double w1, C_COLOR *c1,
65 double w2, C_COLOR *c2);
66 /* multiply two colors */
67 extern double c_cmult(C_COLOR *cres, C_COLOR *c1, double y1,
68 C_COLOR *c2, double y2);
69 /* convert to sharpened RGB */
70 extern void c_toSharpRGB(C_COLOR *cin, double cieY, float cout[3]);
71 /* convert from sharpened RGB */
72 extern double c_fromSharpRGB(float cin[3], C_COLOR *cout);
73
74 /* The following two routines are not defined in ccolor.c */
75 /* convert to RGB color */
76 extern void ccy2rgb(C_COLOR *cin, double cieY, float cout[3]);
77 /* convert from RGB color */
78 extern double rgb2ccy(float cin[3], C_COLOR *cout);
79
80 #ifdef __cplusplus
81 }
82 #endif
83 #endif /* _MGF_COLOR_H_ */