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root/Development/ray/src/cv/mgflib/context.c

Comparing ray/src/cv/mgflib/context.c (file contents):
Revision 1.28 by schorsch, Sun Jul 27 22:12:02 2003 UTC vs.
Revision 1.29 by greg, Mon Jan 3 20:30:21 2011 UTC

#	Line 13 | Line 13 | static const char      RCSid[] = "$Id$";
13		#include "lookup.h"
14
15		/* default context values */
16	–	static C_COLOR          c_dfcolor = C_DEFCOLOR;
16		static C_MATERIAL       c_dfmaterial = C_DEFMATERIAL;
17		static C_VERTEX         c_dfvertex = C_DEFVERTEX;
18
#	Line 34 | Line 33 | static LUTAB   clr_tab = LU_SINIT(free,free);  /* color l
33		static LUTAB    mat_tab = LU_SINIT(free,free);  /* material lookup table */
34		static LUTAB    vtx_tab = LU_SINIT(free,free);  /* vertex lookup table */
35
37	–	/* CIE 1931 Standard Observer curves */
38	–	static C_COLOR  cie_xf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF,
39	–	{14,42,143,435,1344,2839,3483,3362,2908,1954,956,
40	–	320,49,93,633,1655,2904,4334,5945,7621,9163,10263,
41	–	10622,10026,8544,6424,4479,2835,1649,874,468,227,
42	–	114,58,29,14,7,3,2,1,0}, 106836L, .467, .368, 362.230
43	–	};
44	–	static C_COLOR  cie_yf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF,
45	–	{0,1,4,12,40,116,230,380,600,910,1390,2080,3230,
46	–	5030,7100,8620,9540,9950,9950,9520,8700,7570,6310,
47	–	5030,3810,2650,1750,1070,610,320,170,82,41,21,10,
48	–	5,2,1,1,0,0}, 106856L, .398, .542, 493.525
49	–	};
50	–	static C_COLOR  cie_zf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF,
51	–	{65,201,679,2074,6456,13856,17471,17721,16692,
52	–	12876,8130,4652,2720,1582,782,422,203,87,39,21,17,
53	–	11,8,3,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
54	–	106770L, .147, .077, 54.363
55	–	};
56	–	/* Derived CIE 1931 Primaries (imaginary) */
57	–	static C_COLOR  cie_xp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY,
58	–	{-174,-198,-195,-197,-202,-213,-235,-272,-333,
59	–	-444,-688,-1232,-2393,-4497,-6876,-6758,-5256,
60	–	-3100,-815,1320,3200,4782,5998,6861,7408,7754,
61	–	7980,8120,8199,8240,8271,8292,8309,8283,8469,
62	–	8336,8336,8336,8336,8336,8336},
63	–	127424L, 1., .0,
64	–	};
65	–	static C_COLOR  cie_yp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY,
66	–	{-451,-431,-431,-430,-427,-417,-399,-366,-312,
67	–	-204,57,691,2142,4990,8810,9871,9122,7321,5145,
68	–	3023,1123,-473,-1704,-2572,-3127,-3474,-3704,
69	–	-3846,-3927,-3968,-3999,-4021,-4038,-4012,-4201,
70	–	-4066,-4066,-4066,-4066,-4066,-4066},
71	–	-23035L, .0, 1.,
72	–	};
73	–	static C_COLOR  cie_zp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY,
74	–	{4051,4054,4052,4053,4054,4056,4059,4064,4071,
75	–	4074,4056,3967,3677,2933,1492,313,-440,-795,
76	–	-904,-918,-898,-884,-869,-863,-855,-855,-851,
77	–	-848,-847,-846,-846,-846,-845,-846,-843,-845,
78	–	-845,-845,-845,-845,-845},
79	–	36057L, .0, .0,
80	–	};
81	–
36		static int      setspectrum();
37		static int      setbbtemp();
38		static void     mixcolors();
#	Line 486 | Line 440 | char   *name;
440		if ((lp = lu_find(&clr_tab, name)) == NULL)
441		return(NULL);
442		return((C_COLOR *)lp->data);
489	–	}
490	–
491	–
492	–	int
493	–	c_isgrey(clr)                   /* check if color is grey */
494	–	register C_COLOR        *clr;
495	–	{
496	–	if (!(clr->flags & (C_CSXY|C_CSSPEC)))
497	–	return(1);              /* no settings == grey */
498	–	c_ccvt(clr, C_CSXY);
499	–	return(clr->cx >= .323 && clr->cx <= .343 &&
500	–	clr->cy >= .323 && clr->cy <= .343);
501	–	}
502	–
503	–
504	–	void
505	–	c_ccvt(clr, fl)                 /* convert color representations */
506	–	register C_COLOR        *clr;
507	–	int     fl;
508	–	{
509	–	double  x, y, z;
510	–	register int    i;
511	–
512	–	fl &= ~clr->flags;                      /* ignore what's done */
513	–	if (!fl)                                /* everything's done! */
514	–	return;
515	–	if (!(clr->flags & (C_CSXY|C_CSSPEC)))  /* nothing set! */
516	–	*clr = c_dfcolor;
517	–	if (fl & C_CSXY) {              /* cspec -> cxy */
518	–	x = y = z = 0.;
519	–	for (i = 0; i < C_CNSS; i++) {
520	–	x += cie_xf.ssamp[i] * clr->ssamp[i];
521	–	y += cie_yf.ssamp[i] * clr->ssamp[i];
522	–	z += cie_zf.ssamp[i] * clr->ssamp[i];
523	–	}
524	–	x /= (double)cie_xf.ssum;
525	–	y /= (double)cie_yf.ssum;
526	–	z /= (double)cie_zf.ssum;
527	–	z += x + y;
528	–	clr->cx = x / z;
529	–	clr->cy = y / z;
530	–	clr->flags |= C_CSXY;
531	–	} else if (fl & C_CSSPEC) {     /* cxy -> cspec */
532	–	x = clr->cx;
533	–	y = clr->cy;
534	–	z = 1. - x - y;
535	–	clr->ssum = 0;
536	–	for (i = 0; i < C_CNSS; i++) {
537	–	clr->ssamp[i] = x*cie_xp.ssamp[i] + y*cie_yp.ssamp[i]
538	–	+ z*cie_zp.ssamp[i] + .5;
539	–	if (clr->ssamp[i] < 0)          /* out of gamut! */
540	–	clr->ssamp[i] = 0;
541	–	else
542	–	clr->ssum += clr->ssamp[i];
543	–	}
544	–	clr->flags |= C_CSSPEC;
545	–	}
546	–	if (fl & C_CSEFF) {             /* compute efficacy */
547	–	if (clr->flags & C_CSSPEC) {            /* from spectrum */
548	–	y = 0.;
549	–	for (i = 0; i < C_CNSS; i++)
550	–	y += cie_yf.ssamp[i] * clr->ssamp[i];
551	–	clr->eff = C_CLPWM * y / clr->ssum;
552	–	} else /* clr->flags & C_CSXY */ {      /* from (x,y) */
553	–	clr->eff = clr->cx*cie_xf.eff + clr->cy*cie_yf.eff +
554	–	(1. - clr->cx - clr->cy)*cie_zf.eff;
555	–	}
556	–	clr->flags |= C_CSEFF;
557	–	}
443		}
444
445

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