| 1 |
/* Copyright (c) 1994 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Context handlers |
| 9 |
*/ |
| 10 |
|
| 11 |
#include <stdio.h> |
| 12 |
#include <math.h> |
| 13 |
#include <string.h> |
| 14 |
#include "parser.h" |
| 15 |
#include "lookup.h" |
| 16 |
|
| 17 |
/* default context values */ |
| 18 |
static C_COLOR c_dfcolor = C_DEFCOLOR; |
| 19 |
static C_MATERIAL c_dfmaterial = C_DEFMATERIAL; |
| 20 |
static C_VERTEX c_dfvertex = C_DEFVERTEX; |
| 21 |
|
| 22 |
/* the unnamed contexts */ |
| 23 |
static C_COLOR c_uncolor = C_DEFCOLOR; |
| 24 |
static C_MATERIAL c_unmaterial = C_DEFMATERIAL; |
| 25 |
static C_VERTEX c_unvertex = C_DEFVERTEX; |
| 26 |
|
| 27 |
/* the current contexts */ |
| 28 |
C_COLOR *c_ccolor = &c_uncolor; |
| 29 |
C_MATERIAL *c_cmaterial = &c_unmaterial; |
| 30 |
C_VERTEX *c_cvertex = &c_unvertex; |
| 31 |
|
| 32 |
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 */ |
| 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 |
char *nm; |
| 53 |
register LUENT *lp; |
| 54 |
|
| 55 |
switch (mg_entity(av[0])) { |
| 56 |
case MG_E_COLOR: /* get/set color context */ |
| 57 |
if (ac > 4) |
| 58 |
return(MG_EARGC); |
| 59 |
if (ac == 1) { /* set unnamed color context */ |
| 60 |
c_uncolor = c_dfcolor; |
| 61 |
c_ccolor = &c_uncolor; |
| 62 |
return(MG_OK); |
| 63 |
} |
| 64 |
lp = lu_find(&clr_tab, av[1]); /* lookup context */ |
| 65 |
if (lp == NULL) |
| 66 |
return(MG_EMEM); |
| 67 |
c_ccolor = (C_COLOR *)lp->data; |
| 68 |
if (ac == 2) { /* reestablish previous context */ |
| 69 |
if (c_ccolor == NULL) |
| 70 |
return(MG_EUNDEF); |
| 71 |
return(MG_OK); |
| 72 |
} |
| 73 |
if (av[2][0] != '=' || av[2][1]) |
| 74 |
return(MG_ETYPE); |
| 75 |
if (c_ccolor == NULL) { /* create new color context */ |
| 76 |
lp->key = (char *)malloc(strlen(av[1])+1); |
| 77 |
if (lp->key == NULL) |
| 78 |
return(MG_EMEM); |
| 79 |
strcpy(lp->key, av[1]); |
| 80 |
lp->data = (char *)malloc(sizeof(C_COLOR)); |
| 81 |
if (lp->data == NULL) |
| 82 |
return(MG_EMEM); |
| 83 |
c_ccolor = (C_COLOR *)lp->data; |
| 84 |
c_ccolor->clock = 0; |
| 85 |
} |
| 86 |
nm = lp->key; |
| 87 |
i = c_ccolor->clock; |
| 88 |
if (ac == 3) { /* use default template */ |
| 89 |
*c_ccolor = c_dfcolor; |
| 90 |
c_ccolor->name = nm; |
| 91 |
c_ccolor->clock = i + 1; |
| 92 |
return(MG_OK); |
| 93 |
} |
| 94 |
lp = lu_find(&clr_tab, av[3]); /* lookup template */ |
| 95 |
if (lp == NULL) |
| 96 |
return(MG_EMEM); |
| 97 |
if (lp->data == NULL) |
| 98 |
return(MG_EUNDEF); |
| 99 |
*c_ccolor = *(C_COLOR *)lp->data; |
| 100 |
c_ccolor->name = nm; |
| 101 |
c_ccolor->clock = i + 1; |
| 102 |
return(MG_OK); |
| 103 |
case MG_E_CXY: /* assign CIE XY value */ |
| 104 |
if (ac != 3) |
| 105 |
return(MG_EARGC); |
| 106 |
if (!isflt(av[1]) || !isflt(av[2])) |
| 107 |
return(MG_ETYPE); |
| 108 |
c_ccolor->cx = atof(av[1]); |
| 109 |
c_ccolor->cy = atof(av[2]); |
| 110 |
c_ccolor->flags = C_CDXY|C_CSXY; |
| 111 |
if (c_ccolor->cx < 0. | c_ccolor->cy < 0. | |
| 112 |
c_ccolor->cx + c_ccolor->cy > 1.) |
| 113 |
return(MG_EILL); |
| 114 |
c_ccolor->clock++; |
| 115 |
return(MG_OK); |
| 116 |
case MG_E_CSPEC: /* assign spectral values */ |
| 117 |
if (ac < 5) |
| 118 |
return(MG_EARGC); |
| 119 |
if (!isint(av[1]) || !isint(av[2])) |
| 120 |
return(MG_ETYPE); |
| 121 |
return(setspectrum(c_ccolor, atoi(av[1]), atoi(av[2]), |
| 122 |
ac-3, av+3)); |
| 123 |
case MG_E_CMIX: /* mix colors */ |
| 124 |
if (ac < 5 || (ac-1)%2) |
| 125 |
return(MG_EARGC); |
| 126 |
if (!isflt(av[1])) |
| 127 |
return(MG_ETYPE); |
| 128 |
wsum = atof(av[1]); |
| 129 |
if (wsum < 0.) |
| 130 |
return(MG_EILL); |
| 131 |
if ((lp = lu_find(&clr_tab, av[2])) == NULL) |
| 132 |
return(MG_EMEM); |
| 133 |
if (lp->data == NULL) |
| 134 |
return(MG_EUNDEF); |
| 135 |
*c_ccolor = *(C_COLOR *)lp->data; |
| 136 |
for (i = 3; i < ac; i += 2) { |
| 137 |
if (!isflt(av[i])) |
| 138 |
return(MG_ETYPE); |
| 139 |
w = atof(av[i]); |
| 140 |
if (w < 0.) |
| 141 |
return(MG_EILL); |
| 142 |
if ((lp = lu_find(&clr_tab, av[i+1])) == NULL) |
| 143 |
return(MG_EMEM); |
| 144 |
if (lp->data == NULL) |
| 145 |
return(MG_EUNDEF); |
| 146 |
mixcolors(c_ccolor, wsum, c_ccolor, |
| 147 |
w, (C_COLOR *)lp->data); |
| 148 |
wsum += w; |
| 149 |
} |
| 150 |
c_ccolor->clock++; |
| 151 |
return(MG_OK); |
| 152 |
} |
| 153 |
return(MG_EUNK); |
| 154 |
} |
| 155 |
|
| 156 |
|
| 157 |
int |
| 158 |
c_hmaterial(ac, av) /* handle material entity */ |
| 159 |
int ac; |
| 160 |
register char **av; |
| 161 |
{ |
| 162 |
int i; |
| 163 |
char *nm; |
| 164 |
register LUENT *lp; |
| 165 |
|
| 166 |
switch (mg_entity(av[0])) { |
| 167 |
case MG_E_MATERIAL: /* get/set material context */ |
| 168 |
if (ac > 4) |
| 169 |
return(MG_EARGC); |
| 170 |
if (ac == 1) { /* set unnamed material context */ |
| 171 |
c_unmaterial = c_dfmaterial; |
| 172 |
c_cmaterial = &c_unmaterial; |
| 173 |
return(MG_OK); |
| 174 |
} |
| 175 |
lp = lu_find(&mat_tab, av[1]); /* lookup context */ |
| 176 |
if (lp == NULL) |
| 177 |
return(MG_EMEM); |
| 178 |
c_cmaterial = (C_MATERIAL *)lp->data; |
| 179 |
if (ac == 2) { /* reestablish previous context */ |
| 180 |
if (c_cmaterial == NULL) |
| 181 |
return(MG_EUNDEF); |
| 182 |
return(MG_OK); |
| 183 |
} |
| 184 |
if (av[2][0] != '=' || av[2][1]) |
| 185 |
return(MG_ETYPE); |
| 186 |
if (c_cmaterial == NULL) { /* create new material */ |
| 187 |
lp->key = (char *)malloc(strlen(av[1])+1); |
| 188 |
if (lp->key == NULL) |
| 189 |
return(MG_EMEM); |
| 190 |
strcpy(lp->key, av[1]); |
| 191 |
lp->data = (char *)malloc(sizeof(C_MATERIAL)); |
| 192 |
if (lp->data == NULL) |
| 193 |
return(MG_EMEM); |
| 194 |
c_cmaterial = (C_MATERIAL *)lp->data; |
| 195 |
c_cmaterial->clock = 0; |
| 196 |
} |
| 197 |
nm = lp->key; |
| 198 |
i = c_cmaterial->clock; |
| 199 |
if (ac == 3) { /* use default template */ |
| 200 |
*c_cmaterial = c_dfmaterial; |
| 201 |
c_cmaterial->name = nm; |
| 202 |
c_cmaterial->clock = i + 1; |
| 203 |
return(MG_OK); |
| 204 |
} |
| 205 |
lp = lu_find(&mat_tab, av[3]); /* lookup template */ |
| 206 |
if (lp == NULL) |
| 207 |
return(MG_EMEM); |
| 208 |
if (lp->data == NULL) |
| 209 |
return(MG_EUNDEF); |
| 210 |
*c_cmaterial = *(C_MATERIAL *)lp->data; |
| 211 |
c_cmaterial->name = nm; |
| 212 |
c_cmaterial->clock = i + 1; |
| 213 |
return(MG_OK); |
| 214 |
case MG_E_RD: /* set diffuse reflectance */ |
| 215 |
if (ac != 2) |
| 216 |
return(MG_EARGC); |
| 217 |
if (!isflt(av[1])) |
| 218 |
return(MG_ETYPE); |
| 219 |
c_cmaterial->rd = atof(av[1]); |
| 220 |
if (c_cmaterial->rd < 0. | c_cmaterial->rd > 1.) |
| 221 |
return(MG_EILL); |
| 222 |
c_cmaterial->rd_c = *c_ccolor; |
| 223 |
c_cmaterial->clock++; |
| 224 |
return(MG_OK); |
| 225 |
case MG_E_ED: /* set diffuse emittance */ |
| 226 |
if (ac != 2) |
| 227 |
return(MG_EARGC); |
| 228 |
if (!isflt(av[1])) |
| 229 |
return(MG_ETYPE); |
| 230 |
c_cmaterial->ed = atof(av[1]); |
| 231 |
if (c_cmaterial->ed < 0.) |
| 232 |
return(MG_EILL); |
| 233 |
c_cmaterial->ed_c = *c_ccolor; |
| 234 |
c_cmaterial->clock++; |
| 235 |
return(MG_OK); |
| 236 |
case MG_E_TD: /* set diffuse transmittance */ |
| 237 |
if (ac != 2) |
| 238 |
return(MG_EARGC); |
| 239 |
if (!isflt(av[1])) |
| 240 |
return(MG_ETYPE); |
| 241 |
c_cmaterial->td = atof(av[1]); |
| 242 |
if (c_cmaterial->td < 0. | c_cmaterial->td > 1.) |
| 243 |
return(MG_EILL); |
| 244 |
c_cmaterial->td_c = *c_ccolor; |
| 245 |
c_cmaterial->clock++; |
| 246 |
return(MG_OK); |
| 247 |
case MG_E_RS: /* set specular reflectance */ |
| 248 |
if (ac != 3) |
| 249 |
return(MG_EARGC); |
| 250 |
if (!isflt(av[1]) || !isflt(av[2])) |
| 251 |
return(MG_ETYPE); |
| 252 |
c_cmaterial->rs = atof(av[1]); |
| 253 |
c_cmaterial->rs_a = atof(av[2]); |
| 254 |
if (c_cmaterial->rs < 0. | c_cmaterial->rs > 1. | |
| 255 |
c_cmaterial->rs_a < 0.) |
| 256 |
return(MG_EILL); |
| 257 |
c_cmaterial->rs_c = *c_ccolor; |
| 258 |
c_cmaterial->clock++; |
| 259 |
return(MG_OK); |
| 260 |
case MG_E_TS: /* set specular transmittance */ |
| 261 |
if (ac != 3) |
| 262 |
return(MG_EARGC); |
| 263 |
if (!isflt(av[1]) || !isflt(av[2])) |
| 264 |
return(MG_ETYPE); |
| 265 |
c_cmaterial->ts = atof(av[1]); |
| 266 |
c_cmaterial->ts_a = atof(av[2]); |
| 267 |
if (c_cmaterial->ts < 0. | c_cmaterial->ts > 1. | |
| 268 |
c_cmaterial->ts_a < 0.) |
| 269 |
return(MG_EILL); |
| 270 |
c_cmaterial->ts_c = *c_ccolor; |
| 271 |
c_cmaterial->clock++; |
| 272 |
return(MG_OK); |
| 273 |
} |
| 274 |
return(MG_EUNK); |
| 275 |
} |
| 276 |
|
| 277 |
|
| 278 |
int |
| 279 |
c_hvertex(ac, av) /* handle a vertex entity */ |
| 280 |
int ac; |
| 281 |
register char **av; |
| 282 |
{ |
| 283 |
int i; |
| 284 |
char *nm; |
| 285 |
register LUENT *lp; |
| 286 |
|
| 287 |
switch (mg_entity(av[0])) { |
| 288 |
case MG_E_VERTEX: /* get/set vertex context */ |
| 289 |
if (ac > 4) |
| 290 |
return(MG_EARGC); |
| 291 |
if (ac == 1) { /* set unnamed vertex context */ |
| 292 |
c_unvertex = c_dfvertex; |
| 293 |
c_cvertex = &c_unvertex; |
| 294 |
return(MG_OK); |
| 295 |
} |
| 296 |
lp = lu_find(&vtx_tab, av[1]); /* lookup context */ |
| 297 |
if (lp == NULL) |
| 298 |
return(MG_EMEM); |
| 299 |
c_cvertex = (C_VERTEX *)lp->data; |
| 300 |
if (ac == 2) { /* reestablish previous context */ |
| 301 |
if (c_cvertex == NULL) |
| 302 |
return(MG_EUNDEF); |
| 303 |
return(MG_OK); |
| 304 |
} |
| 305 |
if (av[2][0] != '=' || av[2][1]) |
| 306 |
return(MG_ETYPE); |
| 307 |
if (c_cvertex == NULL) { /* create new vertex context */ |
| 308 |
lp->key = (char *)malloc(strlen(av[1])+1); |
| 309 |
if (lp->key == NULL) |
| 310 |
return(MG_EMEM); |
| 311 |
strcpy(lp->key, av[1]); |
| 312 |
lp->data = (char *)malloc(sizeof(C_VERTEX)); |
| 313 |
if (lp->data == NULL) |
| 314 |
return(MG_EMEM); |
| 315 |
c_cvertex = (C_VERTEX *)lp->data; |
| 316 |
} |
| 317 |
nm = lp->key; |
| 318 |
i = c_cvertex->clock; |
| 319 |
if (ac == 3) { /* use default template */ |
| 320 |
*c_cvertex = c_dfvertex; |
| 321 |
c_cvertex->name = nm; |
| 322 |
c_cvertex->clock = i + 1; |
| 323 |
return(MG_OK); |
| 324 |
} |
| 325 |
lp = lu_find(&vtx_tab, av[3]); /* lookup template */ |
| 326 |
if (lp == NULL) |
| 327 |
return(MG_EMEM); |
| 328 |
if (lp->data == NULL) |
| 329 |
return(MG_EUNDEF); |
| 330 |
*c_cvertex = *(C_VERTEX *)lp->data; |
| 331 |
c_cvertex->name = nm; |
| 332 |
c_cvertex->clock = i + 1; |
| 333 |
return(MG_OK); |
| 334 |
case MG_E_POINT: /* set point */ |
| 335 |
if (ac != 4) |
| 336 |
return(MG_EARGC); |
| 337 |
if (!isflt(av[1]) || !isflt(av[2]) || !isflt(av[3])) |
| 338 |
return(MG_ETYPE); |
| 339 |
c_cvertex->p[0] = atof(av[1]); |
| 340 |
c_cvertex->p[1] = atof(av[2]); |
| 341 |
c_cvertex->p[2] = atof(av[3]); |
| 342 |
c_cvertex->clock++; |
| 343 |
return(MG_OK); |
| 344 |
case MG_E_NORMAL: /* set normal */ |
| 345 |
if (ac != 4) |
| 346 |
return(MG_EARGC); |
| 347 |
if (!isflt(av[1]) || !isflt(av[2]) || !isflt(av[3])) |
| 348 |
return(MG_ETYPE); |
| 349 |
c_cvertex->n[0] = atof(av[1]); |
| 350 |
c_cvertex->n[1] = atof(av[2]); |
| 351 |
c_cvertex->n[2] = atof(av[3]); |
| 352 |
(void)normalize(c_cvertex->n); |
| 353 |
c_cvertex->clock++; |
| 354 |
return(MG_OK); |
| 355 |
} |
| 356 |
return(MG_EUNK); |
| 357 |
} |
| 358 |
|
| 359 |
|
| 360 |
void |
| 361 |
c_clearall() /* empty context tables */ |
| 362 |
{ |
| 363 |
c_uncolor = c_dfcolor; |
| 364 |
c_ccolor = &c_uncolor; |
| 365 |
lu_done(&clr_tab); |
| 366 |
c_unmaterial = c_dfmaterial; |
| 367 |
c_cmaterial = &c_unmaterial; |
| 368 |
lu_done(&mat_tab); |
| 369 |
c_unvertex = c_dfvertex; |
| 370 |
c_cvertex = &c_unvertex; |
| 371 |
lu_done(&vtx_tab); |
| 372 |
} |
| 373 |
|
| 374 |
|
| 375 |
C_VERTEX * |
| 376 |
c_getvert(name) /* get a named vertex */ |
| 377 |
char *name; |
| 378 |
{ |
| 379 |
register LUENT *lp; |
| 380 |
|
| 381 |
if ((lp = lu_find(&vtx_tab, name)) == NULL) |
| 382 |
return(NULL); |
| 383 |
return((C_VERTEX *)lp->data); |
| 384 |
} |
| 385 |
|
| 386 |
|
| 387 |
C_COLOR * |
| 388 |
c_getcolor(name) /* get a named color */ |
| 389 |
char *name; |
| 390 |
{ |
| 391 |
register LUENT *lp; |
| 392 |
|
| 393 |
if ((lp = lu_find(&clr_tab, name)) == NULL) |
| 394 |
return(NULL); |
| 395 |
return((C_COLOR *)lp->data); |
| 396 |
} |
| 397 |
|
| 398 |
|
| 399 |
int |
| 400 |
c_isgrey(clr) /* check if color is grey */ |
| 401 |
register C_COLOR *clr; |
| 402 |
{ |
| 403 |
if (!(clr->flags & (C_CSXY|C_CSSPEC))) |
| 404 |
return(1); /* no settings == grey */ |
| 405 |
c_ccvt(clr, C_CSXY); |
| 406 |
return(clr->cx >= .323 && clr->cx <= .343 && |
| 407 |
clr->cy >= .323 && clr->cy <= .343); |
| 408 |
} |
| 409 |
|
| 410 |
|
| 411 |
void |
| 412 |
c_ccvt(clr, fl) /* convert color representations */ |
| 413 |
register C_COLOR *clr; |
| 414 |
int fl; |
| 415 |
{ |
| 416 |
double x, y, z; |
| 417 |
register int i; |
| 418 |
|
| 419 |
if (clr->flags & fl) /* already done */ |
| 420 |
return; |
| 421 |
if (!(clr->flags & (C_CSXY|C_CSSPEC))) /* nothing set! */ |
| 422 |
*clr = c_dfcolor; |
| 423 |
else if (fl & C_CSXY) { /* cspec -> cxy */ |
| 424 |
x = y = z = 0.; |
| 425 |
for (i = 0; i < C_CNSS; i++) { |
| 426 |
x += cie_xf.ssamp[i] * clr->ssamp[i]; |
| 427 |
y += cie_yf.ssamp[i] * clr->ssamp[i]; |
| 428 |
z += cie_zf.ssamp[i] * clr->ssamp[i]; |
| 429 |
} |
| 430 |
z += x + y; |
| 431 |
clr->cx = x / z; |
| 432 |
clr->cy = y / z; |
| 433 |
clr->flags |= C_CSXY; |
| 434 |
} else { /* cxy -> cspec */ |
| 435 |
z = (cie_xf.ssum + cie_yf.ssum + cie_zf.ssum) / 3.; |
| 436 |
x = clr->cx * z / cie_xf.ssum; |
| 437 |
y = clr->cy * z / cie_yf.ssum; |
| 438 |
z = (1. - clr->cx - clr->cy) * z / cie_zf.ssum; |
| 439 |
clr->ssum = 0; |
| 440 |
for (i = 0; i < C_CNSS; i++) |
| 441 |
clr->ssum += clr->ssamp[i] = |
| 442 |
x * cie_xf.ssamp[i] + |
| 443 |
y * cie_yf.ssamp[i] + |
| 444 |
z * cie_zf.ssamp[i] ; |
| 445 |
clr->flags |= C_CSSPEC; |
| 446 |
} |
| 447 |
} |
| 448 |
|
| 449 |
|
| 450 |
static int |
| 451 |
setspectrum(clr, wlmin, wlmax, ac, av) /* convert a spectrum */ |
| 452 |
register C_COLOR *clr; |
| 453 |
int wlmin, wlmax; |
| 454 |
int ac; |
| 455 |
char **av; |
| 456 |
{ |
| 457 |
double scale; |
| 458 |
float *va; |
| 459 |
register int i; |
| 460 |
int wl, pos; |
| 461 |
double wl0, wlstep; |
| 462 |
|
| 463 |
if (wlmin < C_CMINWL || wlmin >= wlmax || wlmax > C_CMAXWL) |
| 464 |
return(MG_EILL); |
| 465 |
if ((va = (float *)malloc(ac*sizeof(float))) == NULL) |
| 466 |
return(MG_EMEM); |
| 467 |
scale = 0.; /* get values and maximum */ |
| 468 |
for (i = 0; i < ac; i++) { |
| 469 |
if (!isflt(av[i])) |
| 470 |
return(MG_ETYPE); |
| 471 |
va[i] = atof(av[i]); |
| 472 |
if (va[i] < 0.) |
| 473 |
return(MG_EILL); |
| 474 |
if (va[i] > scale) |
| 475 |
scale = va[i]; |
| 476 |
} |
| 477 |
if (scale == 0.) |
| 478 |
return(MG_EILL); |
| 479 |
scale = C_CMAXV / scale; |
| 480 |
clr->ssum = 0; /* convert to our spacing */ |
| 481 |
wl0 = wlmin; |
| 482 |
wlstep = (double)(wlmax - wlmin)/(ac-1); |
| 483 |
pos = 0; |
| 484 |
for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI) |
| 485 |
if (wl < wlmin || wl > wlmax) |
| 486 |
clr->ssamp[i] = 0; |
| 487 |
else { |
| 488 |
while (wl0 + wlstep < wl+FTINY) { |
| 489 |
wl0 += wlstep; |
| 490 |
pos++; |
| 491 |
} |
| 492 |
if (wl+FTINY >= wl0 && wl-FTINY <= wl0) |
| 493 |
clr->ssamp[i] = scale*va[pos]; |
| 494 |
else /* interpolate if necessary */ |
| 495 |
clr->ssamp[i] = scale / wlstep * |
| 496 |
( va[pos]*(wl0+wlstep - wl) + |
| 497 |
va[pos+1]*(wl - wl0) ); |
| 498 |
clr->ssum += clr->ssamp[i]; |
| 499 |
} |
| 500 |
clr->flags = C_CDSPEC|C_CSSPEC; |
| 501 |
clr->clock++; |
| 502 |
free((MEM_PTR)va); |
| 503 |
return(MG_OK); |
| 504 |
} |
| 505 |
|
| 506 |
|
| 507 |
static void |
| 508 |
mixcolors(cres, w1, c1, w2, c2) /* mix two colors according to weights given */ |
| 509 |
register C_COLOR *cres, *c1, *c2; |
| 510 |
double w1, w2; |
| 511 |
{ |
| 512 |
double scale; |
| 513 |
float cmix[C_CNSS]; |
| 514 |
register int i; |
| 515 |
|
| 516 |
if ((c1->flags|c2->flags) & C_CDSPEC) { /* spectral mixing */ |
| 517 |
c_ccvt(c1, C_CSSPEC); |
| 518 |
c_ccvt(c2, C_CSSPEC); |
| 519 |
w1 /= (double)c1->ssum; |
| 520 |
w2 /= (double)c2->ssum; |
| 521 |
scale = 0.; |
| 522 |
for (i = 0; i < C_CNSS; i++) { |
| 523 |
cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i]; |
| 524 |
if (cmix[i] > scale) |
| 525 |
scale = cmix[i]; |
| 526 |
} |
| 527 |
scale = C_CMAXV / scale; |
| 528 |
cres->ssum = 0; |
| 529 |
for (i = 0; i < C_CNSS; i++) |
| 530 |
cres->ssum += cres->ssamp[i] = scale*cmix[i] + .5; |
| 531 |
cres->flags = C_CDSPEC|C_CSSPEC; |
| 532 |
} else { /* CIE xy mixing */ |
| 533 |
c_ccvt(c1, C_CSXY); |
| 534 |
c_ccvt(c2, C_CSXY); |
| 535 |
scale = 1. / (w1/c1->cy + w2/c2->cy); |
| 536 |
cres->cx = (c1->cx*w1/c1->cy + c2->cx*w2/c2->cy) * scale; |
| 537 |
cres->cy = (w1 + w2) * scale; |
| 538 |
cres->flags = C_CDXY|C_CSXY; |
| 539 |
} |
| 540 |
} |
