| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: image.c,v 2.28 2004/06/08 19:48:29 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* image.c - routines for image generation. |
| 6 |
* |
| 7 |
* External symbols declared in view.h |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "copyright.h" |
| 11 |
|
| 12 |
#include "rtio.h" |
| 13 |
#include "rtmath.h" |
| 14 |
#include "paths.h" |
| 15 |
#include "view.h" |
| 16 |
|
| 17 |
|
| 18 |
#define FEQ(x,y) (fabs((x)-(y)) <= FTINY) |
| 19 |
#define VEQ(v,w) (FEQ((v)[0],(w)[0]) && FEQ((v)[1],(w)[1]) \ |
| 20 |
&& FEQ((v)[2],(w)[2])) |
| 21 |
|
| 22 |
VIEW stdview = STDVIEW; /* default view parameters */ |
| 23 |
|
| 24 |
static gethfunc gethview; |
| 25 |
|
| 26 |
|
| 27 |
char * |
| 28 |
setview(v) /* set hvec and vvec, return message on error */ |
| 29 |
register VIEW *v; |
| 30 |
{ |
| 31 |
static char ill_horiz[] = "illegal horizontal view size"; |
| 32 |
static char ill_vert[] = "illegal vertical view size"; |
| 33 |
|
| 34 |
if (v->vaft < -FTINY || (v->vaft > FTINY && v->vaft <= v->vfore)) |
| 35 |
return("illegal fore/aft clipping plane"); |
| 36 |
|
| 37 |
v->vdist *= normalize(v->vdir); /* normalize direction */ |
| 38 |
if (v->vdist == 0.0) |
| 39 |
return("zero view direction"); |
| 40 |
|
| 41 |
if (normalize(v->vup) == 0.0) /* normalize view up */ |
| 42 |
return("zero view up vector"); |
| 43 |
|
| 44 |
fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */ |
| 45 |
|
| 46 |
if (normalize(v->hvec) == 0.0) |
| 47 |
return("view up parallel to view direction"); |
| 48 |
|
| 49 |
fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
| 50 |
|
| 51 |
if (v->horiz <= FTINY) |
| 52 |
return(ill_horiz); |
| 53 |
if (v->vert <= FTINY) |
| 54 |
return(ill_vert); |
| 55 |
|
| 56 |
switch (v->type) { |
| 57 |
case VT_PAR: /* parallel view */ |
| 58 |
v->hn2 = v->horiz; |
| 59 |
v->vn2 = v->vert; |
| 60 |
break; |
| 61 |
case VT_PER: /* perspective view */ |
| 62 |
if (v->horiz >= 180.0-FTINY) |
| 63 |
return(ill_horiz); |
| 64 |
if (v->vert >= 180.0-FTINY) |
| 65 |
return(ill_vert); |
| 66 |
v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
| 67 |
v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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break; |
| 69 |
case VT_CYL: /* cylindrical panorama */ |
| 70 |
if (v->horiz > 360.0+FTINY) |
| 71 |
return(ill_horiz); |
| 72 |
if (v->vert >= 180.0-FTINY) |
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return(ill_vert); |
| 74 |
v->hn2 = v->horiz * (PI/180.0); |
| 75 |
v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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break; |
| 77 |
case VT_ANG: /* angular fisheye */ |
| 78 |
if (v->horiz > 360.0+FTINY) |
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return(ill_horiz); |
| 80 |
if (v->vert > 360.0+FTINY) |
| 81 |
return(ill_vert); |
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v->hn2 = v->horiz * (PI/180.0); |
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v->vn2 = v->vert * (PI/180.0); |
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break; |
| 85 |
case VT_HEM: /* hemispherical fisheye */ |
| 86 |
if (v->horiz > 180.0+FTINY) |
| 87 |
return(ill_horiz); |
| 88 |
if (v->vert > 180.0+FTINY) |
| 89 |
return(ill_vert); |
| 90 |
v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0)); |
| 91 |
v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0)); |
| 92 |
break; |
| 93 |
default: |
| 94 |
return("unknown view type"); |
| 95 |
} |
| 96 |
if (v->type != VT_ANG) { |
| 97 |
if (v->type != VT_CYL) { |
| 98 |
v->hvec[0] *= v->hn2; |
| 99 |
v->hvec[1] *= v->hn2; |
| 100 |
v->hvec[2] *= v->hn2; |
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} |
| 102 |
v->vvec[0] *= v->vn2; |
| 103 |
v->vvec[1] *= v->vn2; |
| 104 |
v->vvec[2] *= v->vn2; |
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} |
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v->hn2 *= v->hn2; |
| 107 |
v->vn2 *= v->vn2; |
| 108 |
|
| 109 |
return(NULL); |
| 110 |
} |
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|
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|
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void |
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normaspect(va, ap, xp, yp) /* fix pixel aspect or resolution */ |
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double va; /* view aspect ratio */ |
| 116 |
double *ap; /* pixel aspect in (or out if 0) */ |
| 117 |
int *xp, *yp; /* x and y resolution in (or out if *ap!=0) */ |
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{ |
| 119 |
if (*ap <= FTINY) |
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*ap = va * *xp / *yp; /* compute pixel aspect */ |
| 121 |
else if (va * *xp > *ap * *yp) |
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*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
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else |
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*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
| 125 |
} |
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|
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|
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double |
| 129 |
viewray(orig, direc, v, x, y) /* compute ray origin and direction */ |
| 130 |
FVECT orig, direc; |
| 131 |
register VIEW *v; |
| 132 |
double x, y; |
| 133 |
{ |
| 134 |
double d, z; |
| 135 |
|
| 136 |
x += v->hoff - 0.5; |
| 137 |
y += v->voff - 0.5; |
| 138 |
|
| 139 |
switch(v->type) { |
| 140 |
case VT_PAR: /* parallel view */ |
| 141 |
orig[0] = v->vp[0] + v->vfore*v->vdir[0] |
| 142 |
+ x*v->hvec[0] + y*v->vvec[0]; |
| 143 |
orig[1] = v->vp[1] + v->vfore*v->vdir[1] |
| 144 |
+ x*v->hvec[1] + y*v->vvec[1]; |
| 145 |
orig[2] = v->vp[2] + v->vfore*v->vdir[2] |
| 146 |
+ x*v->hvec[2] + y*v->vvec[2]; |
| 147 |
VCOPY(direc, v->vdir); |
| 148 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
| 149 |
case VT_PER: /* perspective view */ |
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direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
| 152 |
direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
| 153 |
orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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d = normalize(direc); |
| 157 |
return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
| 158 |
case VT_HEM: /* hemispherical fisheye */ |
| 159 |
z = 1.0 - x*x*v->hn2 - y*y*v->vn2; |
| 160 |
if (z < 0.0) |
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return(-1.0); |
| 162 |
z = sqrt(z); |
| 163 |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
| 164 |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
| 165 |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
| 166 |
orig[0] = v->vp[0] + v->vfore*direc[0]; |
| 167 |
orig[1] = v->vp[1] + v->vfore*direc[1]; |
| 168 |
orig[2] = v->vp[2] + v->vfore*direc[2]; |
| 169 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
| 170 |
case VT_CYL: /* cylindrical panorama */ |
| 171 |
d = x * v->horiz * (PI/180.0); |
| 172 |
z = cos(d); |
| 173 |
x = sin(d); |
| 174 |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
| 175 |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
| 176 |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
| 177 |
orig[0] = v->vp[0] + v->vfore*direc[0]; |
| 178 |
orig[1] = v->vp[1] + v->vfore*direc[1]; |
| 179 |
orig[2] = v->vp[2] + v->vfore*direc[2]; |
| 180 |
d = normalize(direc); |
| 181 |
return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
| 182 |
case VT_ANG: /* angular fisheye */ |
| 183 |
x *= v->horiz/180.0; |
| 184 |
y *= v->vert/180.0; |
| 185 |
d = x*x + y*y; |
| 186 |
if (d > 1.0) |
| 187 |
return(-1.0); |
| 188 |
d = sqrt(d); |
| 189 |
z = cos(PI*d); |
| 190 |
d = d <= FTINY ? PI : sqrt(1 - z*z)/d; |
| 191 |
x *= d; |
| 192 |
y *= d; |
| 193 |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
| 194 |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
| 195 |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
| 196 |
orig[0] = v->vp[0] + v->vfore*direc[0]; |
| 197 |
orig[1] = v->vp[1] + v->vfore*direc[1]; |
| 198 |
orig[2] = v->vp[2] + v->vfore*direc[2]; |
| 199 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
| 200 |
} |
| 201 |
return(-1.0); |
| 202 |
} |
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|
| 204 |
|
| 205 |
void |
| 206 |
viewloc(ip, v, p) /* find image location for point */ |
| 207 |
FVECT ip; |
| 208 |
register VIEW *v; |
| 209 |
FVECT p; |
| 210 |
{ |
| 211 |
double d, d2; |
| 212 |
FVECT disp; |
| 213 |
|
| 214 |
disp[0] = p[0] - v->vp[0]; |
| 215 |
disp[1] = p[1] - v->vp[1]; |
| 216 |
disp[2] = p[2] - v->vp[2]; |
| 217 |
|
| 218 |
switch (v->type) { |
| 219 |
case VT_PAR: /* parallel view */ |
| 220 |
ip[2] = DOT(disp,v->vdir) - v->vfore; |
| 221 |
break; |
| 222 |
case VT_PER: /* perspective view */ |
| 223 |
d = DOT(disp,v->vdir); |
| 224 |
ip[2] = VLEN(disp); |
| 225 |
if (d < 0.0) { /* fold pyramid */ |
| 226 |
ip[2] = -ip[2]; |
| 227 |
d = -d; |
| 228 |
} |
| 229 |
if (d > FTINY) { |
| 230 |
d = 1.0/d; |
| 231 |
disp[0] *= d; |
| 232 |
disp[1] *= d; |
| 233 |
disp[2] *= d; |
| 234 |
} |
| 235 |
ip[2] *= (1.0 - v->vfore*d); |
| 236 |
break; |
| 237 |
case VT_HEM: /* hemispherical fisheye */ |
| 238 |
d = normalize(disp); |
| 239 |
if (DOT(disp,v->vdir) < 0.0) |
| 240 |
ip[2] = -d; |
| 241 |
else |
| 242 |
ip[2] = d; |
| 243 |
ip[2] -= v->vfore; |
| 244 |
break; |
| 245 |
case VT_CYL: /* cylindrical panorama */ |
| 246 |
d = DOT(disp,v->hvec); |
| 247 |
d2 = DOT(disp,v->vdir); |
| 248 |
ip[0] = 180.0/PI * atan2(d,d2) / v->horiz + 0.5 - v->hoff; |
| 249 |
d = 1.0/sqrt(d*d + d2*d2); |
| 250 |
ip[1] = DOT(disp,v->vvec)*d/v->vn2 + 0.5 - v->voff; |
| 251 |
ip[2] = VLEN(disp); |
| 252 |
ip[2] *= (1.0 - v->vfore*d); |
| 253 |
return; |
| 254 |
case VT_ANG: /* angular fisheye */ |
| 255 |
ip[0] = 0.5 - v->hoff; |
| 256 |
ip[1] = 0.5 - v->voff; |
| 257 |
ip[2] = normalize(disp) - v->vfore; |
| 258 |
d = DOT(disp,v->vdir); |
| 259 |
if (d >= 1.0-FTINY) |
| 260 |
return; |
| 261 |
if (d <= -(1.0-FTINY)) { |
| 262 |
ip[0] += 180.0/v->horiz; |
| 263 |
return; |
| 264 |
} |
| 265 |
d = acos(d)/PI / sqrt(1.0 - d*d); |
| 266 |
ip[0] += DOT(disp,v->hvec)*d*180.0/v->horiz; |
| 267 |
ip[1] += DOT(disp,v->vvec)*d*180.0/v->vert; |
| 268 |
return; |
| 269 |
} |
| 270 |
ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
| 271 |
ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
| 272 |
} |
| 273 |
|
| 274 |
|
| 275 |
void |
| 276 |
pix2loc(loc, rp, px, py) /* compute image location from pixel pos. */ |
| 277 |
RREAL loc[2]; |
| 278 |
register RESOLU *rp; |
| 279 |
int px, py; |
| 280 |
{ |
| 281 |
register int x, y; |
| 282 |
|
| 283 |
if (rp->rt & YMAJOR) { |
| 284 |
x = px; |
| 285 |
y = py; |
| 286 |
} else { |
| 287 |
x = py; |
| 288 |
y = px; |
| 289 |
} |
| 290 |
if (rp->rt & XDECR) |
| 291 |
x = rp->xr-1 - x; |
| 292 |
if (rp->rt & YDECR) |
| 293 |
y = rp->yr-1 - y; |
| 294 |
loc[0] = (x+.5)/rp->xr; |
| 295 |
loc[1] = (y+.5)/rp->yr; |
| 296 |
} |
| 297 |
|
| 298 |
|
| 299 |
void |
| 300 |
loc2pix(pp, rp, lx, ly) /* compute pixel pos. from image location */ |
| 301 |
int pp[2]; |
| 302 |
register RESOLU *rp; |
| 303 |
double lx, ly; |
| 304 |
{ |
| 305 |
register int x, y; |
| 306 |
|
| 307 |
x = lx * rp->xr; |
| 308 |
y = ly * rp->yr; |
| 309 |
if (rp->rt & XDECR) |
| 310 |
x = rp->xr-1 - x; |
| 311 |
if (rp->rt & YDECR) |
| 312 |
y = rp->yr-1 - y; |
| 313 |
if (rp->rt & YMAJOR) { |
| 314 |
pp[0] = x; |
| 315 |
pp[1] = y; |
| 316 |
} else { |
| 317 |
pp[0] = y; |
| 318 |
pp[1] = x; |
| 319 |
} |
| 320 |
} |
| 321 |
|
| 322 |
|
| 323 |
int |
| 324 |
getviewopt(v, ac, av) /* process view argument */ |
| 325 |
register VIEW *v; |
| 326 |
int ac; |
| 327 |
register char *av[]; |
| 328 |
{ |
| 329 |
#define check(c,l) if ((av[0][c]&&av[0][c]!=' ') || \ |
| 330 |
badarg(ac-1,av+1,l)) return(-1) |
| 331 |
|
| 332 |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
| 333 |
return(-1); |
| 334 |
switch (av[0][2]) { |
| 335 |
case 't': /* type */ |
| 336 |
if (!av[0][3] || av[0][3]==' ') |
| 337 |
return(-1); |
| 338 |
check(4,""); |
| 339 |
v->type = av[0][3]; |
| 340 |
return(0); |
| 341 |
case 'p': /* point */ |
| 342 |
check(3,"fff"); |
| 343 |
v->vp[0] = atof(av[1]); |
| 344 |
v->vp[1] = atof(av[2]); |
| 345 |
v->vp[2] = atof(av[3]); |
| 346 |
return(3); |
| 347 |
case 'd': /* direction */ |
| 348 |
check(3,"fff"); |
| 349 |
v->vdir[0] = atof(av[1]); |
| 350 |
v->vdir[1] = atof(av[2]); |
| 351 |
v->vdir[2] = atof(av[3]); |
| 352 |
return(3); |
| 353 |
case 'u': /* up */ |
| 354 |
check(3,"fff"); |
| 355 |
v->vup[0] = atof(av[1]); |
| 356 |
v->vup[1] = atof(av[2]); |
| 357 |
v->vup[2] = atof(av[3]); |
| 358 |
return(3); |
| 359 |
case 'h': /* horizontal size */ |
| 360 |
check(3,"f"); |
| 361 |
v->horiz = atof(av[1]); |
| 362 |
return(1); |
| 363 |
case 'v': /* vertical size */ |
| 364 |
check(3,"f"); |
| 365 |
v->vert = atof(av[1]); |
| 366 |
return(1); |
| 367 |
case 'o': /* fore clipping plane */ |
| 368 |
check(3,"f"); |
| 369 |
v->vfore = atof(av[1]); |
| 370 |
return(1); |
| 371 |
case 'a': /* aft clipping plane */ |
| 372 |
check(3,"f"); |
| 373 |
v->vaft = atof(av[1]); |
| 374 |
return(1); |
| 375 |
case 's': /* shift */ |
| 376 |
check(3,"f"); |
| 377 |
v->hoff = atof(av[1]); |
| 378 |
return(1); |
| 379 |
case 'l': /* lift */ |
| 380 |
check(3,"f"); |
| 381 |
v->voff = atof(av[1]); |
| 382 |
return(1); |
| 383 |
default: |
| 384 |
return(-1); |
| 385 |
} |
| 386 |
#undef check |
| 387 |
} |
| 388 |
|
| 389 |
|
| 390 |
int |
| 391 |
sscanview(vp, s) /* get view parameters from string */ |
| 392 |
VIEW *vp; |
| 393 |
register char *s; |
| 394 |
{ |
| 395 |
int ac; |
| 396 |
char *av[4]; |
| 397 |
int na; |
| 398 |
int nvopts = 0; |
| 399 |
|
| 400 |
while (*s == ' ') |
| 401 |
s++; |
| 402 |
if (*s != '-') |
| 403 |
s = sskip2(s,1); |
| 404 |
while (*s) { |
| 405 |
ac = 0; |
| 406 |
do { |
| 407 |
if (ac || *s == '-') |
| 408 |
av[ac++] = s; |
| 409 |
while (*s && *s != ' ') |
| 410 |
s++; |
| 411 |
while (*s == ' ') |
| 412 |
s++; |
| 413 |
} while (*s && ac < 4); |
| 414 |
if ((na = getviewopt(vp, ac, av)) >= 0) { |
| 415 |
if (na+1 < ac) |
| 416 |
s = av[na+1]; |
| 417 |
nvopts++; |
| 418 |
} else if (ac > 1) |
| 419 |
s = av[1]; |
| 420 |
} |
| 421 |
return(nvopts); |
| 422 |
} |
| 423 |
|
| 424 |
|
| 425 |
void |
| 426 |
fprintview(vp, fp) /* write out view parameters */ |
| 427 |
register VIEW *vp; |
| 428 |
FILE *fp; |
| 429 |
{ |
| 430 |
fprintf(fp, " -vt%c", vp->type); |
| 431 |
fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]); |
| 432 |
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0]*vp->vdist, |
| 433 |
vp->vdir[1]*vp->vdist, |
| 434 |
vp->vdir[2]*vp->vdist); |
| 435 |
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
| 436 |
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
| 437 |
fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft); |
| 438 |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
| 439 |
} |
| 440 |
|
| 441 |
|
| 442 |
char * |
| 443 |
viewopt(vp) /* translate to minimal view string */ |
| 444 |
register VIEW *vp; |
| 445 |
{ |
| 446 |
static char vwstr[128]; |
| 447 |
register char *cp = vwstr; |
| 448 |
|
| 449 |
if (vp->type != stdview.type) { |
| 450 |
sprintf(cp, " -vt%c", vp->type); |
| 451 |
cp += strlen(cp); |
| 452 |
} |
| 453 |
if (!VEQ(vp->vp,stdview.vp)) { |
| 454 |
sprintf(cp, " -vp %.6g %.6g %.6g", |
| 455 |
vp->vp[0], vp->vp[1], vp->vp[2]); |
| 456 |
cp += strlen(cp); |
| 457 |
} |
| 458 |
if (!FEQ(vp->vdist,stdview.vdist) || !VEQ(vp->vdir,stdview.vdir)) { |
| 459 |
sprintf(cp, " -vd %.6g %.6g %.6g", |
| 460 |
vp->vdir[0]*vp->vdist, |
| 461 |
vp->vdir[1]*vp->vdist, |
| 462 |
vp->vdir[2]*vp->vdist); |
| 463 |
cp += strlen(cp); |
| 464 |
} |
| 465 |
if (!VEQ(vp->vup,stdview.vup)) { |
| 466 |
sprintf(cp, " -vu %.6g %.6g %.6g", |
| 467 |
vp->vup[0], vp->vup[1], vp->vup[2]); |
| 468 |
cp += strlen(cp); |
| 469 |
} |
| 470 |
if (!FEQ(vp->horiz,stdview.horiz)) { |
| 471 |
sprintf(cp, " -vh %.6g", vp->horiz); |
| 472 |
cp += strlen(cp); |
| 473 |
} |
| 474 |
if (!FEQ(vp->vert,stdview.vert)) { |
| 475 |
sprintf(cp, " -vv %.6g", vp->vert); |
| 476 |
cp += strlen(cp); |
| 477 |
} |
| 478 |
if (!FEQ(vp->vfore,stdview.vfore)) { |
| 479 |
sprintf(cp, " -vo %.6g", vp->vfore); |
| 480 |
cp += strlen(cp); |
| 481 |
} |
| 482 |
if (!FEQ(vp->vaft,stdview.vaft)) { |
| 483 |
sprintf(cp, " -va %.6g", vp->vaft); |
| 484 |
cp += strlen(cp); |
| 485 |
} |
| 486 |
if (!FEQ(vp->hoff,stdview.hoff)) { |
| 487 |
sprintf(cp, " -vs %.6g", vp->hoff); |
| 488 |
cp += strlen(cp); |
| 489 |
} |
| 490 |
if (!FEQ(vp->voff,stdview.voff)) { |
| 491 |
sprintf(cp, " -vl %.6g", vp->voff); |
| 492 |
cp += strlen(cp); |
| 493 |
} |
| 494 |
return(vwstr); |
| 495 |
} |
| 496 |
|
| 497 |
|
| 498 |
int |
| 499 |
isview(s) /* is this a view string? */ |
| 500 |
char *s; |
| 501 |
{ |
| 502 |
static char *altname[]={NULL,VIEWSTR,"rpict","rview","rvu","rpiece","pinterp",NULL}; |
| 503 |
extern char *progname; |
| 504 |
register char *cp; |
| 505 |
register char **an; |
| 506 |
/* add program name to list */ |
| 507 |
if (altname[0] == NULL) { |
| 508 |
for (cp = progname; *cp; cp++) |
| 509 |
; |
| 510 |
while (cp > progname && !ISDIRSEP(cp[-1])) |
| 511 |
cp--; |
| 512 |
altname[0] = cp; |
| 513 |
} |
| 514 |
/* skip leading path */ |
| 515 |
cp = s; |
| 516 |
while (*cp && *cp != ' ') |
| 517 |
cp++; |
| 518 |
while (cp > s && !ISDIRSEP(cp[-1])) |
| 519 |
cp--; |
| 520 |
for (an = altname; *an != NULL; an++) |
| 521 |
if (!strncmp(*an, cp, strlen(*an))) |
| 522 |
return(1); |
| 523 |
return(0); |
| 524 |
} |
| 525 |
|
| 526 |
|
| 527 |
struct myview { |
| 528 |
VIEW *hv; |
| 529 |
int ok; |
| 530 |
}; |
| 531 |
|
| 532 |
|
| 533 |
static int |
| 534 |
gethview( /* get view from header */ |
| 535 |
char *s, |
| 536 |
void *v |
| 537 |
) |
| 538 |
{ |
| 539 |
if (isview(s) && sscanview(((struct myview*)v)->hv, s) > 0) |
| 540 |
((struct myview*)v)->ok++; |
| 541 |
return(0); |
| 542 |
} |
| 543 |
|
| 544 |
|
| 545 |
int |
| 546 |
viewfile(fname, vp, rp) /* get view from file */ |
| 547 |
char *fname; |
| 548 |
VIEW *vp; |
| 549 |
RESOLU *rp; |
| 550 |
{ |
| 551 |
struct myview mvs; |
| 552 |
FILE *fp; |
| 553 |
|
| 554 |
if (fname == NULL || !strcmp(fname, "-")) |
| 555 |
fp = stdin; |
| 556 |
else if ((fp = fopen(fname, "r")) == NULL) |
| 557 |
return(-1); |
| 558 |
|
| 559 |
mvs.hv = vp; |
| 560 |
mvs.ok = 0; |
| 561 |
|
| 562 |
getheader(fp, gethview, &mvs); |
| 563 |
|
| 564 |
if (rp != NULL && !fgetsresolu(rp, fp)) |
| 565 |
mvs.ok = 0; |
| 566 |
|
| 567 |
fclose(fp); |
| 568 |
|
| 569 |
return(mvs.ok); |
| 570 |
} |
