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greg |
3.10 |
/* RCSid $Id: ccolor.h,v 3.9 2023/11/15 18:02:52 greg Exp $ */ |
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greg |
3.1 |
/* |
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* Header file for spectral colors. |
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* |
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*/ |
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#ifndef _MGF_COLOR_H_ |
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#define _MGF_COLOR_H_ |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#define C_CMINWL 380 /* minimum wavelength */ |
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#define C_CMAXWL 780 /* maximum wavelength */ |
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#define C_CNSS 41 /* number of spectral samples */ |
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#define C_CWLI ((C_CMAXWL-C_CMINWL)/(C_CNSS-1)) |
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#define C_CMAXV 10000 /* nominal maximum sample value */ |
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#define C_CLPWM (683./C_CMAXV) /* peak lumens/watt multiplier */ |
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#define C_CSSPEC 01 /* flag if spectrum is set */ |
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#define C_CDSPEC 02 /* flag if defined w/ spectrum */ |
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#define C_CSXY 04 /* flag if xy is set */ |
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#define C_CDXY 010 /* flag if defined w/ xy */ |
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#define C_CSEFF 020 /* flag if efficacy set */ |
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typedef struct { |
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int clock; /* incremented each change */ |
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void *client_data; /* pointer to private client-owned data */ |
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short flags; /* what's been set and how */ |
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short ssamp[C_CNSS]; /* spectral samples, min wl to max */ |
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long ssum; /* straight sum of spectral values */ |
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float cx, cy; /* xy chromaticity value */ |
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float eff; /* efficacy (lumens/watt) */ |
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} C_COLOR; |
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greg |
3.7 |
typedef unsigned short C_CHROMA; /* encoded (x,y) chromaticity */ |
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greg |
3.1 |
#define C_DEFCOLOR { 1, NULL, C_CDXY|C_CSXY|C_CSSPEC|C_CSEFF,\ |
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{C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
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C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
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C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
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C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
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C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
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C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,\ |
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C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV,C_CMAXV},\ |
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(long)C_CNSS*C_CMAXV, 1./3., 1./3., 178.006 } |
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greg |
3.9 |
#define c_cval(c,l) ((c)->ssamp[((l)+(.5*C_CWLI-C_MINWL))/C_CWLI] \ |
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greg |
3.4 |
/ (double)(c)->ssum) |
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greg |
3.1 |
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greg |
3.6 |
extern const C_COLOR c_dfcolor; /* default color */ |
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greg |
3.8 |
extern const C_CHROMA c_dfchroma; /* c_encodeChroma(&c_dfcolor) */ |
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greg |
3.6 |
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extern const C_COLOR c_x31, c_y31, c_z31; /* 1931 standard observer */ |
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greg |
3.1 |
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greg |
3.4 |
/* set CIE (x,y) chromaticity */ |
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#define c_cset(c,x,y) ((c)->cx=(x),(c)->cy=(y),(c)->flags=C_CDXY|C_CSXY) |
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/* set black body spectrum */ |
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extern int c_bbtemp(C_COLOR *clr, double tk); |
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greg |
3.3 |
/* assign arbitrary spectrum */ |
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extern double c_sset(C_COLOR *clr, double wlmin, double wlmax, |
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const float spec[], int nwl); |
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extern void c_ccvt(C_COLOR *clr, int fl); /* fix color representation */ |
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greg |
3.10 |
/* are colors equivalent? */ |
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extern int c_equiv(C_COLOR *c1, C_COLOR *c2); |
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greg |
3.3 |
extern int c_isgrey(C_COLOR *clr); /* check if color is grey */ |
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greg |
3.1 |
/* mix two colors */ |
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extern void c_cmix(C_COLOR *cres, double w1, C_COLOR *c1, |
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double w2, C_COLOR *c2); |
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3.2 |
/* multiply two colors */ |
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extern double c_cmult(C_COLOR *cres, C_COLOR *c1, double y1, |
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C_COLOR *c2, double y2); |
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3.5 |
/* convert to sharpened RGB */ |
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extern void c_toSharpRGB(C_COLOR *cin, double cieY, float cout[3]); |
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/* convert from sharpened RGB */ |
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extern double c_fromSharpRGB(float cin[3], C_COLOR *cout); |
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greg |
3.7 |
/* encode (x,y) chromaticity */ |
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extern C_CHROMA c_encodeChroma(C_COLOR *clr); |
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/* decode (x,y) chromaticity */ |
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extern void c_decodeChroma(C_COLOR *cres, C_CHROMA ccode); |
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greg |
3.5 |
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greg |
3.9 |
#ifdef _RAD_COLOR_H_ |
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/* The following four routines are defined in ccyrgb.c */ |
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greg |
3.1 |
/* convert to RGB color */ |
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greg |
3.9 |
extern void ccy2rgb(C_COLOR *cin, double cieY, COLOR cout); |
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greg |
3.1 |
/* convert from RGB color */ |
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greg |
3.9 |
extern double rgb2ccy(COLOR cin, C_COLOR *cout); |
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/* convert to spectral color */ |
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extern void ccy2scolor(C_COLOR *cin, double cieY, SCOLOR sco); |
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/* convert from spectral color */ |
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extern double scolor2ccy(SCOLOR sci, C_COLOR *cout); |
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#endif /* _RAD_COLOR_H_ */ |
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greg |
3.1 |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* _MGF_COLOR_H_ */ |
