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 |
|
|
36 |
+ |
/* CIE 1931 Standard Observer */ |
37 |
+ |
static C_COLOR cie_xf = C_CIEX; |
38 |
+ |
static C_COLOR cie_yf = C_CIEY; |
39 |
+ |
static C_COLOR cie_zf = C_CIEZ; |
40 |
|
|
41 |
+ |
static int setspectrum(); |
42 |
+ |
static void mixcolors(); |
43 |
+ |
|
44 |
+ |
|
45 |
|
int |
46 |
|
c_hcolor(ac, av) /* handle color entity */ |
47 |
|
int ac; |
48 |
|
register char **av; |
49 |
|
{ |
50 |
+ |
double w, wsum; |
51 |
+ |
register int i; |
52 |
|
register LUENT *lp; |
53 |
|
|
54 |
|
switch (mg_entity(av[0])) { |
101 |
|
return(MG_ETYPE); |
102 |
|
c_ccolor->cx = atof(av[1]); |
103 |
|
c_ccolor->cy = atof(av[2]); |
104 |
+ |
c_ccolor->flags = C_CDXY|C_CSXY; |
105 |
|
if (c_ccolor->cx < 0. | c_ccolor->cy < 0. | |
106 |
|
c_ccolor->cx + c_ccolor->cy > 1.) |
107 |
|
return(MG_EILL); |
108 |
|
return(MG_OK); |
109 |
+ |
case MG_E_CSPEC: /* assign spectral values */ |
110 |
+ |
if (ac < 5) |
111 |
+ |
return(MG_EARGC); |
112 |
+ |
if (!isint(av[1]) || !isint(av[2])) |
113 |
+ |
return(MG_ETYPE); |
114 |
+ |
return(setspectrum(c_ccolor, atoi(av[1]), atoi(av[2]), |
115 |
+ |
ac-3, av+3)); |
116 |
+ |
case MG_E_CMIX: /* mix colors */ |
117 |
+ |
if (ac < 5 || (ac-1)%2) |
118 |
+ |
return(MG_EARGC); |
119 |
+ |
if (!isflt(av[1])) |
120 |
+ |
return(MG_ETYPE); |
121 |
+ |
wsum = atof(av[1]); |
122 |
+ |
if (wsum < 0.) |
123 |
+ |
return(MG_EILL); |
124 |
+ |
if ((lp = lu_find(&clr_tab, av[2])) == NULL) |
125 |
+ |
return(MG_EMEM); |
126 |
+ |
if (lp->data == NULL) |
127 |
+ |
return(MG_EUNDEF); |
128 |
+ |
*c_ccolor = *(C_COLOR *)lp->data; |
129 |
+ |
for (i = 3; i < ac; i += 2) { |
130 |
+ |
if (!isflt(av[i])) |
131 |
+ |
return(MG_ETYPE); |
132 |
+ |
w = atof(av[i]); |
133 |
+ |
if (w < 0.) |
134 |
+ |
return(MG_EILL); |
135 |
+ |
if ((lp = lu_find(&clr_tab, av[i+1])) == NULL) |
136 |
+ |
return(MG_EMEM); |
137 |
+ |
if (lp->data == NULL) |
138 |
+ |
return(MG_EUNDEF); |
139 |
+ |
mixcolors(c_ccolor, wsum, c_ccolor, |
140 |
+ |
w, (C_COLOR *)lp->data); |
141 |
+ |
wsum += w; |
142 |
+ |
} |
143 |
+ |
return(MG_OK); |
144 |
|
} |
145 |
|
return(MG_EUNK); |
146 |
|
} |
360 |
|
if ((lp = lu_find(&vtx_tab, name)) == NULL) |
361 |
|
return(NULL); |
362 |
|
return((C_VERTEX *)lp->data); |
363 |
+ |
} |
364 |
+ |
|
365 |
+ |
|
366 |
+ |
C_COLOR * |
367 |
+ |
c_getcolor(name) /* get a named color */ |
368 |
+ |
char *name; |
369 |
+ |
{ |
370 |
+ |
register LUENT *lp; |
371 |
+ |
|
372 |
+ |
if ((lp = lu_find(&clr_tab, name)) == NULL) |
373 |
+ |
return(NULL); |
374 |
+ |
return((C_COLOR *)lp->data); |
375 |
+ |
} |
376 |
+ |
|
377 |
+ |
|
378 |
+ |
int |
379 |
+ |
c_isgrey(clr) /* check if color is grey */ |
380 |
+ |
register C_COLOR *clr; |
381 |
+ |
{ |
382 |
+ |
if (!clr->flags) |
383 |
+ |
return(1); /* no settings == grey */ |
384 |
+ |
c_ccvt(clr, C_CSXY); |
385 |
+ |
return(clr->cx >= .323 && clr->cx <= .343 && |
386 |
+ |
clr->cy >= .323 && clr->cy <= .343); |
387 |
+ |
} |
388 |
+ |
|
389 |
+ |
|
390 |
+ |
void |
391 |
+ |
c_ccvt(clr, fl) /* convert color representations */ |
392 |
+ |
register C_COLOR *clr; |
393 |
+ |
int fl; |
394 |
+ |
{ |
395 |
+ |
double x, y, z; |
396 |
+ |
register int i; |
397 |
+ |
|
398 |
+ |
if (clr->flags & fl) /* already done */ |
399 |
+ |
return; |
400 |
+ |
if (!(clr->flags & (C_CSXY|C_CSSPEC))) /* nothing set */ |
401 |
+ |
*clr = c_dfcolor; |
402 |
+ |
else if (fl & C_CSXY) { /* cspec -> cxy */ |
403 |
+ |
x = y = z = 0.; |
404 |
+ |
for (i = 0; i < C_CNSS; i++) { |
405 |
+ |
x += cie_xf.ssamp[i] * clr->ssamp[i]; |
406 |
+ |
y += cie_yf.ssamp[i] * clr->ssamp[i]; |
407 |
+ |
z += cie_zf.ssamp[i] * clr->ssamp[i]; |
408 |
+ |
} |
409 |
+ |
z += x + y; |
410 |
+ |
clr->cx = x / z; |
411 |
+ |
clr->cy = y / z; |
412 |
+ |
clr->flags |= C_CSXY; |
413 |
+ |
} else { /* cxy -> cspec */ |
414 |
+ |
z = (cie_xf.ssum + cie_yf.ssum + cie_zf.ssum) / 3.; |
415 |
+ |
x = clr->cx * z / cie_xf.ssum; |
416 |
+ |
y = clr->cy * z / cie_yf.ssum; |
417 |
+ |
z = (1. - clr->cx - clr->cy) * z / cie_zf.ssum; |
418 |
+ |
clr->ssum = 0; |
419 |
+ |
for (i = 0; i < C_CNSS; i++) |
420 |
+ |
clr->ssum += clr->ssamp[i] = |
421 |
+ |
x * cie_xf.ssamp[i] + |
422 |
+ |
y * cie_yf.ssamp[i] + |
423 |
+ |
z * cie_zf.ssamp[i] ; |
424 |
+ |
clr->flags |= C_CSSPEC; |
425 |
+ |
} |
426 |
+ |
} |
427 |
+ |
|
428 |
+ |
|
429 |
+ |
static int |
430 |
+ |
setspectrum(clr, wlmin, wlmax, ac, av) /* convert a spectrum */ |
431 |
+ |
register C_COLOR *clr; |
432 |
+ |
int wlmin, wlmax; |
433 |
+ |
int ac; |
434 |
+ |
char **av; |
435 |
+ |
{ |
436 |
+ |
double scale; |
437 |
+ |
float *va; |
438 |
+ |
register int i; |
439 |
+ |
int wl, pos; |
440 |
+ |
double wl0, wlstep; |
441 |
+ |
|
442 |
+ |
if (wlmin < C_CMINWL || wlmin >= wlmax || wlmax > C_CMAXWL) |
443 |
+ |
return(MG_EILL); |
444 |
+ |
if ((va = (float *)malloc(ac*sizeof(float))) == NULL) |
445 |
+ |
return(MG_EMEM); |
446 |
+ |
scale = 0.; /* get values and maximum */ |
447 |
+ |
for (i = 0; i < ac; i++) { |
448 |
+ |
if (!isflt(av[i])) |
449 |
+ |
return(MG_ETYPE); |
450 |
+ |
va[i] = atof(av[i]); |
451 |
+ |
if (va[i] < 0.) |
452 |
+ |
return(MG_EILL); |
453 |
+ |
if (va[i] > scale) |
454 |
+ |
scale = va[i]; |
455 |
+ |
} |
456 |
+ |
if (scale == 0.) |
457 |
+ |
return(MG_EILL); |
458 |
+ |
scale = C_CMAXV / scale; |
459 |
+ |
clr->ssum = 0; /* convert to our spacing */ |
460 |
+ |
wl0 = wlmin; |
461 |
+ |
wlstep = (double)(wlmax - wlmin)/(ac-1); |
462 |
+ |
pos = 0; |
463 |
+ |
for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI) |
464 |
+ |
if (wl < wlmin || wl > wlmax) |
465 |
+ |
clr->ssamp[i] = 0; |
466 |
+ |
else { |
467 |
+ |
while (wl0 + wlstep < wl+FTINY) { |
468 |
+ |
wl0 += wlstep; |
469 |
+ |
pos++; |
470 |
+ |
} |
471 |
+ |
if (wl+FTINY >= wl0 && wl-FTINY <= wl0) |
472 |
+ |
clr->ssamp[i] = scale*va[pos]; |
473 |
+ |
else /* interpolate if necessary */ |
474 |
+ |
clr->ssamp[i] = scale / wlstep * |
475 |
+ |
( va[pos]*(wl0+wlstep - wl) + |
476 |
+ |
va[pos+1]*(wl - wl0) ); |
477 |
+ |
clr->ssum += clr->ssamp[i]; |
478 |
+ |
} |
479 |
+ |
clr->flags = C_CDSPEC|C_CSSPEC; |
480 |
+ |
free((MEM_PTR)va); |
481 |
+ |
return(MG_OK); |
482 |
+ |
} |
483 |
+ |
|
484 |
+ |
|
485 |
+ |
static void |
486 |
+ |
mixcolors(cres, w1, c1, w2, c2) /* mix two colors according to weights given */ |
487 |
+ |
register C_COLOR *cres, *c1, *c2; |
488 |
+ |
double w1, w2; |
489 |
+ |
{ |
490 |
+ |
double scale; |
491 |
+ |
float cmix[C_CNSS]; |
492 |
+ |
register int i; |
493 |
+ |
|
494 |
+ |
if ((c1->flags|c2->flags) & C_CDSPEC) { /* spectral mixing */ |
495 |
+ |
c_ccvt(c1, C_CSSPEC); |
496 |
+ |
c_ccvt(c2, C_CSSPEC); |
497 |
+ |
w1 /= (double)c1->ssum; |
498 |
+ |
w2 /= (double)c2->ssum; |
499 |
+ |
scale = 0.; |
500 |
+ |
for (i = 0; i < C_CNSS; i++) { |
501 |
+ |
cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i]; |
502 |
+ |
if (cmix[i] > scale) |
503 |
+ |
scale = cmix[i]; |
504 |
+ |
} |
505 |
+ |
scale = C_CMAXV / scale; |
506 |
+ |
cres->ssum = 0; |
507 |
+ |
for (i = 0; i < C_CNSS; i++) |
508 |
+ |
cres->ssum += cres->ssamp[i] = scale*cmix[i] + .5; |
509 |
+ |
cres->flags = C_CDSPEC|C_CSSPEC; |
510 |
+ |
} else { /* CIE xy mixing */ |
511 |
+ |
c_ccvt(c1, C_CSXY); |
512 |
+ |
c_ccvt(c2, C_CSXY); |
513 |
+ |
scale = 1. / (w1/c1->cy + w2/c2->cy); |
514 |
+ |
cres->cx = (c1->cx*w1/c1->cy + c2->cx*w2/c2->cy) * scale; |
515 |
+ |
cres->cy = (w1 + w2) * scale; |
516 |
+ |
cres->flags = C_CDXY|C_CSXY; |
517 |
+ |
} |
518 |
|
} |