9 |
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*/ |
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#include <stdio.h> |
12 |
+ |
#include <math.h> |
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#include <string.h> |
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#include "parser.h" |
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#include "lookup.h" |
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C_MATERIAL *c_cmaterial = &c_unmaterial; |
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C_VERTEX *c_cvertex = &c_unvertex; |
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|
32 |
< |
static LUTAB clr_tab; /* color lookup table */ |
33 |
< |
static LUTAB mat_tab; /* material lookup table */ |
34 |
< |
static LUTAB vtx_tab; /* vertex lookup table */ |
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> |
static LUTAB clr_tab = LU_SINIT(free,free); /* color lookup table */ |
33 |
> |
static LUTAB mat_tab = LU_SINIT(free,free); /* material lookup table */ |
34 |
> |
static LUTAB vtx_tab = LU_SINIT(free,free); /* vertex lookup table */ |
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|
36 |
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/* CIE 1931 Standard Observer */ |
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static C_COLOR cie_xf = C_CIEX; |
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static C_COLOR cie_yf = C_CIEY; |
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static C_COLOR cie_zf = C_CIEZ; |
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|
41 |
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static int setspectrum(); |
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static void mixcolors(); |
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|
44 |
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|
45 |
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int |
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c_hcolor(ac, av) /* handle color entity */ |
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int ac; |
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register char **av; |
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{ |
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double w, wsum; |
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register int i; |
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register LUENT *lp; |
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|
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switch (mg_entity(av[0])) { |
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case MG_E_COLOR: /* get/set color context */ |
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if (ac > 4) |
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return(MG_EARGC); |
58 |
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if (ac == 1) { /* set unnamed color context */ |
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c_uncolor = c_dfcolor; |
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c_ccolor = &c_uncolor; |
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return(MG_ETYPE); |
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c_ccolor->cx = atof(av[1]); |
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c_ccolor->cy = atof(av[2]); |
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c_ccolor->flags = C_CDXY|C_CSXY; |
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if (c_ccolor->cx < 0. | c_ccolor->cy < 0. | |
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c_ccolor->cx + c_ccolor->cy > 1.) |
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return(MG_EILL); |
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return(MG_OK); |
109 |
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case MG_E_CSPEC: /* assign spectral values */ |
110 |
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if (ac < 5) |
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return(MG_EARGC); |
112 |
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if (!isint(av[1]) || !isint(av[2])) |
113 |
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return(MG_ETYPE); |
114 |
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return(setspectrum(c_ccolor, atoi(av[1]), atoi(av[2]), |
115 |
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ac-3, av+3)); |
116 |
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case MG_E_CMIX: /* mix colors */ |
117 |
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if (ac < 5 || (ac-1)%2) |
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return(MG_EARGC); |
119 |
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if (!isflt(av[1])) |
120 |
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return(MG_ETYPE); |
121 |
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wsum = atof(av[1]); |
122 |
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if (wsum < 0.) |
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return(MG_EILL); |
124 |
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if ((lp = lu_find(&clr_tab, av[2])) == NULL) |
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return(MG_EMEM); |
126 |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
128 |
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*c_ccolor = *(C_COLOR *)lp->data; |
129 |
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for (i = 3; i < ac; i += 2) { |
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if (!isflt(av[i])) |
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return(MG_ETYPE); |
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w = atof(av[i]); |
133 |
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if (w < 0.) |
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return(MG_EILL); |
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if ((lp = lu_find(&clr_tab, av[i+1])) == NULL) |
136 |
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return(MG_EMEM); |
137 |
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if (lp->data == NULL) |
138 |
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return(MG_EUNDEF); |
139 |
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mixcolors(c_ccolor, wsum, c_ccolor, |
140 |
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w, (C_COLOR *)lp->data); |
141 |
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wsum += w; |
142 |
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} |
143 |
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return(MG_OK); |
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} |
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return(MG_EUNK); |
146 |
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} |
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|
156 |
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switch (mg_entity(av[0])) { |
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case MG_E_MATERIAL: /* get/set material context */ |
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if (ac > 4) |
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return(MG_EARGC); |
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if (ac == 1) { /* set unnamed material context */ |
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c_unmaterial = c_dfmaterial; |
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c_cmaterial = &c_unmaterial; |
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c_cmaterial = (C_MATERIAL *)lp->data; |
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if (ac == 3) { /* use default template */ |
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*c_cmaterial = c_dfmaterial; |
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c_cmaterial->name = lp->key; |
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return(MG_OK); |
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} |
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lp = lu_find(&mat_tab, av[3]); /* lookup template */ |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
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*c_cmaterial = *(C_MATERIAL *)lp->data; |
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c_cmaterial->name = lp->key; |
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c_cmaterial->clock = 1; |
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if (ac > 4) |
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return(MG_EARGC); |
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return(MG_OK); |
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if (c_cmaterial->rd < 0. | c_cmaterial->rd > 1.) |
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return(MG_EILL); |
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c_cmaterial->rd_c = *c_ccolor; |
211 |
+ |
c_cmaterial->clock++; |
212 |
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return(MG_OK); |
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case MG_E_ED: /* set diffuse emittance */ |
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if (ac != 2) |
219 |
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if (c_cmaterial->ed < 0.) |
220 |
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return(MG_EILL); |
221 |
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c_cmaterial->ed_c = *c_ccolor; |
222 |
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c_cmaterial->clock++; |
223 |
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return(MG_OK); |
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case MG_E_TD: /* set diffuse transmittance */ |
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if (ac != 2) |
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c_cmaterial->rs_a < 0.) |
243 |
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return(MG_EILL); |
244 |
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c_cmaterial->rs_c = *c_ccolor; |
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c_cmaterial->clock++; |
246 |
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return(MG_OK); |
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case MG_E_TS: /* set specular transmittance */ |
248 |
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if (ac != 3) |
255 |
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c_cmaterial->ts_a < 0.) |
256 |
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return(MG_EILL); |
257 |
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c_cmaterial->ts_c = *c_ccolor; |
258 |
+ |
c_cmaterial->clock++; |
259 |
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return(MG_OK); |
260 |
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} |
261 |
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return(MG_EUNK); |
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|
272 |
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switch (mg_entity(av[0])) { |
273 |
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case MG_E_VERTEX: /* get/set vertex context */ |
274 |
+ |
if (ac > 4) |
275 |
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return(MG_EARGC); |
276 |
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if (ac == 1) { /* set unnamed vertex context */ |
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c_unvertex = c_dfvertex; |
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c_cvertex = &c_unvertex; |
336 |
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} |
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|
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|
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static void |
280 |
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freectx(lp) /* free a context table entry */ |
281 |
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register LUENT *lp; |
282 |
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{ |
283 |
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free((MEM_PTR)lp->key); |
284 |
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free((MEM_PTR)lp->data); |
285 |
– |
} |
286 |
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|
287 |
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|
339 |
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void |
340 |
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c_clearall() /* empty context tables */ |
341 |
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{ |
342 |
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c_uncolor = c_dfcolor; |
343 |
|
c_ccolor = &c_uncolor; |
344 |
< |
lu_done(&clr_tab, freectx); |
344 |
> |
lu_done(&clr_tab); |
345 |
|
c_unmaterial = c_dfmaterial; |
346 |
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c_cmaterial = &c_unmaterial; |
347 |
< |
lu_done(&mat_tab, freectx); |
347 |
> |
lu_done(&mat_tab); |
348 |
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c_unvertex = c_dfvertex; |
349 |
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c_cvertex = &c_unvertex; |
350 |
< |
lu_done(&vtx_tab, freectx); |
350 |
> |
lu_done(&vtx_tab); |
351 |
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} |
352 |
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|
353 |
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|
360 |
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if ((lp = lu_find(&vtx_tab, name)) == NULL) |
361 |
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return(NULL); |
362 |
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return((C_VERTEX *)lp->data); |
363 |
+ |
} |
364 |
+ |
|
365 |
+ |
|
366 |
+ |
int |
367 |
+ |
c_isgrey(clr) /* check if color is grey */ |
368 |
+ |
register C_COLOR *clr; |
369 |
+ |
{ |
370 |
+ |
if (!clr->flags) |
371 |
+ |
return(1); /* no settings == grey */ |
372 |
+ |
c_ccvt(clr, C_CSXY); |
373 |
+ |
return(clr->cx >= .323 && clr->cx <= .343 && |
374 |
+ |
clr->cy >= .323 && clr->cy <= .343); |
375 |
+ |
} |
376 |
+ |
|
377 |
+ |
|
378 |
+ |
void |
379 |
+ |
c_ccvt(clr, fl) /* convert color representations */ |
380 |
+ |
register C_COLOR *clr; |
381 |
+ |
int fl; |
382 |
+ |
{ |
383 |
+ |
double x, y, z; |
384 |
+ |
register int i; |
385 |
+ |
|
386 |
+ |
if (clr->flags & fl) /* already done */ |
387 |
+ |
return; |
388 |
+ |
if (!(clr->flags & (C_SXY|C_SSPEC)) /* nothing set */ |
389 |
+ |
*clr = c_dfcolor; |
390 |
+ |
else if (fl & C_CSXY) { /* cspec -> cxy */ |
391 |
+ |
x = y = z = 0.; |
392 |
+ |
for (i = 0; i < C_CNSS; i++) { |
393 |
+ |
x += cie_xf.ssamp[i] * clr->ssamp[i]; |
394 |
+ |
y += cie_yf.ssamp[i] * clr->ssamp[i]; |
395 |
+ |
z += cie_zf.ssamp[i] * clr->ssamp[i]; |
396 |
+ |
} |
397 |
+ |
z += x + y; |
398 |
+ |
clr->cx = x / z; |
399 |
+ |
clr->cy = y / z; |
400 |
+ |
clr->flags |= C_CSXY; |
401 |
+ |
} else { /* cxy -> cspec */ |
402 |
+ |
z = (cie_xf.ssum + cie_yf.ssum + cie_zf.ssum) / 3.; |
403 |
+ |
x = clr->cx * z / cie_xf.ssum; |
404 |
+ |
y = clr->cy * z / cie_yf.ssum; |
405 |
+ |
z = (1. - clr->cx - clr->cy) * z / cie_zf.ssum; |
406 |
+ |
clr->ssum = 0; |
407 |
+ |
for (i = 0; i < C_CNSS; i++) |
408 |
+ |
clr->ssum += clr->ssamp[i] = |
409 |
+ |
x * cie_xf.ssamp[i] + |
410 |
+ |
y * cie_yf.ssamp[i] + |
411 |
+ |
z * cie_zf.ssamp[i] ; |
412 |
+ |
clr->flags |= C_CSSPEC; |
413 |
+ |
} |
414 |
+ |
} |
415 |
+ |
|
416 |
+ |
|
417 |
+ |
static int |
418 |
+ |
setspectrum(clr, wlmin, wlmax, ac, av) /* convert a spectrum */ |
419 |
+ |
register C_COLOR *clr; |
420 |
+ |
int wlmin, wlmax; |
421 |
+ |
int ac; |
422 |
+ |
char **av; |
423 |
+ |
{ |
424 |
+ |
double scale; |
425 |
+ |
float *va; |
426 |
+ |
register int i; |
427 |
+ |
int wl, pos; |
428 |
+ |
double wl0, wlstep; |
429 |
+ |
|
430 |
+ |
if (wlmin < C_CMINWL || wlmin >= wlmax || wlmax > C_CMAXWL) |
431 |
+ |
return(MG_EILL); |
432 |
+ |
if ((va = (float *)malloc(ac*sizeof(float))) == NULL) |
433 |
+ |
return(MG_EMEM); |
434 |
+ |
scale = 0.; /* get values and maximum */ |
435 |
+ |
for (i = 0; i < ac; i++) { |
436 |
+ |
if (!isflt(av[i])) |
437 |
+ |
return(MG_ETYPE); |
438 |
+ |
va[i] = atof(av[i]); |
439 |
+ |
if (va[i] < 0.) |
440 |
+ |
return(MG_EILL); |
441 |
+ |
if (va[i] > scale) |
442 |
+ |
scale = va[i]; |
443 |
+ |
} |
444 |
+ |
if (scale == 0.) |
445 |
+ |
return(MG_EILL); |
446 |
+ |
scale = C_CMAXV / scale; |
447 |
+ |
clr->ssum = 0; /* convert to our spacing */ |
448 |
+ |
wl0 = wlmin; |
449 |
+ |
wlstep = (double)(wlmax - wlmin)/(ac-1); |
450 |
+ |
pos = 0; |
451 |
+ |
for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI) |
452 |
+ |
if (wl < wlmin || wl > wlmax) |
453 |
+ |
clr->ssamp[i] = 0; |
454 |
+ |
else { |
455 |
+ |
while (wl0 + wlstep < wl+FTINY) { |
456 |
+ |
wl0 += wlstep; |
457 |
+ |
pos++; |
458 |
+ |
} |
459 |
+ |
if (wl+FTINY >= wl0 && wl-FTINY <= wl0) |
460 |
+ |
clr->ssamp[i] = scale*va[pos]; |
461 |
+ |
else /* interpolate if necessary */ |
462 |
+ |
clr->ssamp[i] = scale / wlstep * |
463 |
+ |
( va[pos]*(wl0+wlstep - wl) + |
464 |
+ |
va[pos+1]*(wl - wl0) ); |
465 |
+ |
clr->ssum += clr->ssamp[i]; |
466 |
+ |
} |
467 |
+ |
clr->flags = C_CDSPEC|C_CSSPEC; |
468 |
+ |
free((MEM_PTR)va); |
469 |
+ |
return(MG_OK); |
470 |
+ |
} |
471 |
+ |
|
472 |
+ |
|
473 |
+ |
static void |
474 |
+ |
mixcolors(cres, w1, c1, w2, c2) /* mix two colors according to weights given */ |
475 |
+ |
register C_COLOR *cres, *c1, *c2; |
476 |
+ |
double w1, w2; |
477 |
+ |
{ |
478 |
+ |
double scale; |
479 |
+ |
float cmix[C_CNSS]; |
480 |
+ |
register int i; |
481 |
+ |
|
482 |
+ |
if ((c1->flags|c2->flags) & C_CDSPEC) { /* spectral mixing */ |
483 |
+ |
c_ccvt(c1, C_CSSPEC); |
484 |
+ |
c_ccvt(c2, C_CSSPEC); |
485 |
+ |
w1 /= (double)c1->ssum; |
486 |
+ |
w2 /= (double)c2->ssum; |
487 |
+ |
scale = 0.; |
488 |
+ |
for (i = 0; i < C_CNSS; i++) { |
489 |
+ |
cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i]; |
490 |
+ |
if (cmix[i] > scale) |
491 |
+ |
scale = cmix[i]; |
492 |
+ |
} |
493 |
+ |
scale = C_CMAXV / scale; |
494 |
+ |
cres->ssum = 0; |
495 |
+ |
for (i = 0; i < C_CNSS; i++) |
496 |
+ |
cres->ssum += cres->ssamp[i] = scale*cmix[i] + .5; |
497 |
+ |
cres->flags = C_CDSPEC|C_CSSPEC; |
498 |
+ |
} else { /* CIE xy mixing */ |
499 |
+ |
c_ccvt(c1, C_CSXY); |
500 |
+ |
c_ccvt(c2, C_CSXY); |
501 |
+ |
scale = 1. / (w1/c1->cy + w2/c2->cy); |
502 |
+ |
cres->cx = (c1->cx*w1/c1->cy + c2->cx*w2/c2->cy) * scale; |
503 |
+ |
cres->cy = (w1 + w2) * scale; |
504 |
+ |
cres->flags = C_CDXY|C_CSXY; |
505 |
+ |
} |
506 |
|
} |