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root/radiance/ray/src/common/image.c
Revision: 2.47
Committed: Fri Apr 27 17:36:01 2018 UTC (6 years ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.46: +7 -6 lines
Log Message: 
Slight tweak on last change, should not affect outcome

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 greg 2.47 static const char RCSid[] = "$Id: image.c,v 2.46 2018/04/27 05:00:29 greg Exp $";
3 greg 1.1 #endif
4     /*
5     * image.c - routines for image generation.
6 greg 2.16 *
7     * External symbols declared in view.h
8     */
9    
10 greg 2.17 #include "copyright.h"
11 greg 1.1
12 greg 2.32 #include <ctype.h>
13 schorsch 2.22 #include "rtio.h"
14 greg 2.28 #include "rtmath.h"
15 greg 2.27 #include "paths.h"
16 greg 1.1 #include "view.h"
17    
18 greg 2.4
19 greg 2.11 #define FEQ(x,y) (fabs((x)-(y)) <= FTINY)
20     #define VEQ(v,w) (FEQ((v)[0],(w)[0]) && FEQ((v)[1],(w)[1]) \
21     && FEQ((v)[2],(w)[2]))
22    
23 greg 1.5 VIEW stdview = STDVIEW; /* default view parameters */
24 greg 1.1
25 schorsch 2.26 static gethfunc gethview;
26    
27 greg 1.1
28     char *
29 greg 2.35 setview( /* set hvec and vvec, return message on error */
30     VIEW *v
31     )
32 greg 1.3 {
33 greg 1.12 static char ill_horiz[] = "illegal horizontal view size";
34     static char ill_vert[] = "illegal vertical view size";
35    
36 greg 2.39 if ((v->vfore < -FTINY) | (v->vaft < -FTINY) ||
37     (v->vaft > FTINY) & (v->vaft <= v->vfore))
38 greg 2.7 return("illegal fore/aft clipping plane");
39    
40 greg 2.31 if (v->vdist <= FTINY)
41     return("illegal view distance");
42 greg 2.29 v->vdist *= normalize(v->vdir); /* normalize direction */
43     if (v->vdist == 0.0)
44 greg 1.1 return("zero view direction");
45    
46 greg 1.14 if (normalize(v->vup) == 0.0) /* normalize view up */
47     return("zero view up vector");
48    
49 greg 1.5 fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */
50    
51     if (normalize(v->hvec) == 0.0)
52 greg 1.14 return("view up parallel to view direction");
53 greg 1.1
54 greg 1.5 fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */
55    
56 greg 1.12 if (v->horiz <= FTINY)
57     return(ill_horiz);
58     if (v->vert <= FTINY)
59     return(ill_vert);
60    
61     switch (v->type) {
62     case VT_PAR: /* parallel view */
63 greg 1.5 v->hn2 = v->horiz;
64 greg 1.12 v->vn2 = v->vert;
65     break;
66     case VT_PER: /* perspective view */
67     if (v->horiz >= 180.0-FTINY)
68     return(ill_horiz);
69     if (v->vert >= 180.0-FTINY)
70     return(ill_vert);
71 greg 1.5 v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0));
72 greg 1.12 v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
73     break;
74 greg 2.9 case VT_CYL: /* cylindrical panorama */
75     if (v->horiz > 360.0+FTINY)
76     return(ill_horiz);
77     if (v->vert >= 180.0-FTINY)
78     return(ill_vert);
79     v->hn2 = v->horiz * (PI/180.0);
80     v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
81     break;
82 greg 1.12 case VT_ANG: /* angular fisheye */
83     if (v->horiz > 360.0+FTINY)
84     return(ill_horiz);
85     if (v->vert > 360.0+FTINY)
86     return(ill_vert);
87 greg 2.9 v->hn2 = v->horiz * (PI/180.0);
88     v->vn2 = v->vert * (PI/180.0);
89 greg 1.12 break;
90     case VT_HEM: /* hemispherical fisheye */
91     if (v->horiz > 180.0+FTINY)
92     return(ill_horiz);
93     if (v->vert > 180.0+FTINY)
94     return(ill_vert);
95     v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0));
96     v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0));
97     break;
98 greg 2.34 case VT_PLS: /* planispheric fisheye */
99     if (v->horiz >= 360.0-FTINY)
100     return(ill_horiz);
101     if (v->vert >= 360.0-FTINY)
102     return(ill_vert);
103     v->hn2 = 2.*sin(v->horiz*(PI/180.0/2.0)) /
104     (1.0 + cos(v->horiz*(PI/180.0/2.0)));
105     v->vn2 = 2.*sin(v->vert*(PI/180.0/2.0)) /
106     (1.0 + cos(v->vert*(PI/180.0/2.0)));
107     break;
108 greg 1.12 default:
109 greg 1.1 return("unknown view type");
110 greg 1.12 }
111 greg 2.34 if (v->type != VT_ANG && v->type != VT_PLS) {
112 greg 2.9 if (v->type != VT_CYL) {
113     v->hvec[0] *= v->hn2;
114     v->hvec[1] *= v->hn2;
115     v->hvec[2] *= v->hn2;
116     }
117 greg 1.12 v->vvec[0] *= v->vn2;
118     v->vvec[1] *= v->vn2;
119     v->vvec[2] *= v->vn2;
120     }
121 greg 1.5 v->hn2 *= v->hn2;
122     v->vn2 *= v->vn2;
123 greg 1.1
124     return(NULL);
125     }
126    
127    
128 greg 2.16 void
129 greg 2.35 normaspect( /* fix pixel aspect or resolution */
130     double va, /* view aspect ratio */
131     double *ap, /* pixel aspect in (or out if 0) */
132     int *xp,
133     int *yp /* x and y resolution in (or out if *ap!=0) */
134     )
135 greg 1.6 {
136     if (*ap <= FTINY)
137 greg 1.7 *ap = va * *xp / *yp; /* compute pixel aspect */
138 greg 1.6 else if (va * *xp > *ap * *yp)
139 greg 1.10 *xp = *yp / va * *ap + .5; /* reduce x resolution */
140 greg 1.6 else
141 greg 1.10 *yp = *xp * va / *ap + .5; /* reduce y resolution */
142 greg 1.6 }
143    
144    
145 greg 2.7 double
146 greg 2.35 viewray( /* compute ray origin and direction */
147     FVECT orig,
148     FVECT direc,
149     VIEW *v,
150     double x,
151     double y
152     )
153 greg 1.1 {
154 greg 1.12 double d, z;
155    
156 greg 1.5 x += v->hoff - 0.5;
157     y += v->voff - 0.5;
158 greg 1.1
159 greg 1.12 switch(v->type) {
160     case VT_PAR: /* parallel view */
161 greg 2.7 orig[0] = v->vp[0] + v->vfore*v->vdir[0]
162     + x*v->hvec[0] + y*v->vvec[0];
163     orig[1] = v->vp[1] + v->vfore*v->vdir[1]
164     + x*v->hvec[1] + y*v->vvec[1];
165     orig[2] = v->vp[2] + v->vfore*v->vdir[2]
166     + x*v->hvec[2] + y*v->vvec[2];
167 greg 1.1 VCOPY(direc, v->vdir);
168 greg 2.8 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
169 greg 1.12 case VT_PER: /* perspective view */
170 greg 1.5 direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
171     direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
172     direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
173 greg 2.40 VSUM(orig, v->vp, direc, v->vfore);
174 greg 2.7 d = normalize(direc);
175 greg 2.8 return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
176 greg 1.12 case VT_HEM: /* hemispherical fisheye */
177 greg 1.13 z = 1.0 - x*x*v->hn2 - y*y*v->vn2;
178 greg 1.12 if (z < 0.0)
179 greg 2.7 return(-1.0);
180 greg 1.12 z = sqrt(z);
181     direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
182     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
183     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
184 greg 2.40 VSUM(orig, v->vp, direc, v->vfore);
185 greg 2.8 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
186 greg 2.9 case VT_CYL: /* cylindrical panorama */
187     d = x * v->horiz * (PI/180.0);
188     z = cos(d);
189     x = sin(d);
190     direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
191     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
192     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
193 greg 2.40 VSUM(orig, v->vp, direc, v->vfore);
194 greg 2.9 d = normalize(direc);
195     return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
196 greg 1.12 case VT_ANG: /* angular fisheye */
197 greg 2.34 x *= (1.0/180.0)*v->horiz;
198     y *= (1.0/180.0)*v->vert;
199 greg 1.12 d = x*x + y*y;
200     if (d > 1.0)
201 greg 2.7 return(-1.0);
202 greg 1.12 d = sqrt(d);
203     z = cos(PI*d);
204 greg 2.34 d = d <= FTINY ? PI : sqrt(1.0 - z*z)/d;
205     x *= d;
206     y *= d;
207     direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
208     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
209     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
210 greg 2.40 VSUM(orig, v->vp, direc, v->vfore);
211 greg 2.34 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
212     case VT_PLS: /* planispheric fisheye */
213     x *= sqrt(v->hn2);
214     y *= sqrt(v->vn2);
215     d = x*x + y*y;
216     z = (1. - d)/(1. + d);
217 greg 2.38 x *= (1. + z);
218     y *= (1. + z);
219 greg 1.12 direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
220     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
221     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
222 greg 2.40 VSUM(orig, v->vp, direc, v->vfore);
223 greg 2.8 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
224 greg 1.1 }
225 greg 2.7 return(-1.0);
226 greg 1.1 }
227    
228    
229 greg 2.41 int
230 greg 2.35 viewloc( /* find image location for point */
231     FVECT ip,
232     VIEW *v,
233     FVECT p
234 greg 2.46 ) /* Use VL_* flags to interpret return value */
235 greg 1.3 {
236 greg 2.46 int rflags = VL_GOOD;
237 gregl 2.13 double d, d2;
238 greg 1.3 FVECT disp;
239 greg 1.5
240 greg 2.34 VSUB(disp, p, v->vp);
241 greg 1.3
242 greg 1.12 switch (v->type) {
243     case VT_PAR: /* parallel view */
244 greg 2.7 ip[2] = DOT(disp,v->vdir) - v->vfore;
245 greg 1.13 break;
246 greg 1.12 case VT_PER: /* perspective view */
247 greg 1.11 d = DOT(disp,v->vdir);
248 greg 2.47 if ((v->vaft > FTINY) & (d >= v->vaft))
249 greg 2.46 rflags |= VL_BEYOND;
250 gregl 2.13 ip[2] = VLEN(disp);
251 greg 2.42 if (d < -FTINY) { /* fold pyramid */
252 greg 1.17 ip[2] = -ip[2];
253 greg 1.11 d = -d;
254 greg 2.42 } else if (d <= FTINY)
255 greg 2.46 return(VL_BAD); /* at infinite edge */
256 greg 2.41 d = 1.0/d;
257     disp[0] *= d;
258     disp[1] *= d;
259     disp[2] *= d;
260 greg 2.42 if (ip[2] < 0.0) d = -d;
261 greg 2.7 ip[2] *= (1.0 - v->vfore*d);
262 greg 1.13 break;
263 greg 1.12 case VT_HEM: /* hemispherical fisheye */
264     d = normalize(disp);
265 greg 1.17 if (DOT(disp,v->vdir) < 0.0)
266     ip[2] = -d;
267     else
268     ip[2] = d;
269 greg 2.7 ip[2] -= v->vfore;
270 greg 1.13 break;
271 greg 2.9 case VT_CYL: /* cylindrical panorama */
272     d = DOT(disp,v->hvec);
273 gregl 2.13 d2 = DOT(disp,v->vdir);
274     ip[0] = 180.0/PI * atan2(d,d2) / v->horiz + 0.5 - v->hoff;
275 greg 2.41 d = d*d + d2*d2;
276     if (d <= FTINY*FTINY)
277 greg 2.46 return(VL_BAD); /* at pole */
278 greg 2.47 if ((v->vaft > FTINY) & (d >= v->vaft*v->vaft))
279 greg 2.46 rflags |= VL_BEYOND;
280 greg 2.41 d = 1.0/sqrt(d);
281 gregl 2.13 ip[1] = DOT(disp,v->vvec)*d/v->vn2 + 0.5 - v->voff;
282     ip[2] = VLEN(disp);
283 gwlarson 2.15 ip[2] *= (1.0 - v->vfore*d);
284 greg 2.42 goto gotall;
285 greg 1.12 case VT_ANG: /* angular fisheye */
286 greg 1.17 ip[0] = 0.5 - v->hoff;
287     ip[1] = 0.5 - v->voff;
288 greg 2.7 ip[2] = normalize(disp) - v->vfore;
289 greg 1.12 d = DOT(disp,v->vdir);
290     if (d >= 1.0-FTINY)
291 greg 2.42 goto gotall;
292 greg 1.12 if (d <= -(1.0-FTINY)) {
293 greg 2.7 ip[0] += 180.0/v->horiz;
294 greg 2.42 goto gotall;
295 greg 1.12 }
296 greg 2.34 d = (180.0/PI)*acos(d) / sqrt(1.0 - d*d);
297     ip[0] += DOT(disp,v->hvec)*d/v->horiz;
298     ip[1] += DOT(disp,v->vvec)*d/v->vert;
299 greg 2.42 goto gotall;
300 greg 2.34 case VT_PLS: /* planispheric fisheye */
301     ip[0] = 0.5 - v->hoff;
302     ip[1] = 0.5 - v->voff;
303     ip[2] = normalize(disp) - v->vfore;
304     d = DOT(disp,v->vdir);
305     if (d >= 1.0-FTINY)
306 greg 2.42 goto gotall;
307 greg 2.34 if (d <= -(1.0-FTINY))
308 greg 2.46 return(VL_BAD);
309 greg 2.38 ip[0] += DOT(disp,v->hvec)/((1. + d)*sqrt(v->hn2));
310     ip[1] += DOT(disp,v->vvec)/((1. + d)*sqrt(v->vn2));
311 greg 2.42 goto gotall;
312 greg 2.45 default:
313 greg 2.46 return(VL_BAD);
314 greg 1.3 }
315 greg 1.17 ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff;
316     ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff;
317 greg 2.46 gotall: /* add appropriate return flags */
318 greg 2.47 if (!(rflags & (VL_BEHIND|VL_BEYOND)))
319     rflags |= (ip[2] <= 0.0) ? VL_BEHIND :
320     VL_BEYOND * ((v->vaft > FTINY) &
321     (ip[2] >= v->vaft - v->vfore));
322 greg 2.46 rflags |= VL_OUTSIDE*((0.0 >= ip[0]) | (ip[0] >= 1.0) |
323     (0.0 >= ip[1]) | (ip[1] >= 1.0));
324     return(rflags);
325 greg 1.3 }
326    
327    
328 greg 2.16 void
329 greg 2.35 pix2loc( /* compute image location from pixel pos. */
330     RREAL loc[2],
331     RESOLU *rp,
332     int px,
333     int py
334     )
335 greg 1.17 {
336 greg 2.36 int x, y;
337 greg 1.17
338 greg 2.16 if (rp->rt & YMAJOR) {
339 greg 1.17 x = px;
340     y = py;
341     } else {
342     x = py;
343     y = px;
344     }
345 greg 2.16 if (rp->rt & XDECR)
346 greg 1.17 x = rp->xr-1 - x;
347 greg 2.16 if (rp->rt & YDECR)
348 greg 1.17 y = rp->yr-1 - y;
349     loc[0] = (x+.5)/rp->xr;
350     loc[1] = (y+.5)/rp->yr;
351     }
352    
353    
354 greg 2.16 void
355 greg 2.35 loc2pix( /* compute pixel pos. from image location */
356     int pp[2],
357     RESOLU *rp,
358     double lx,
359     double ly
360     )
361 greg 1.17 {
362 greg 2.36 int x, y;
363 greg 1.17
364 greg 2.37 x = (int)(lx*rp->xr + .5 - (lx < 0.0));
365     y = (int)(ly*rp->yr + .5 - (ly < 0.0));
366    
367 greg 2.16 if (rp->rt & XDECR)
368 greg 1.17 x = rp->xr-1 - x;
369 greg 2.16 if (rp->rt & YDECR)
370 greg 1.17 y = rp->yr-1 - y;
371 greg 2.16 if (rp->rt & YMAJOR) {
372 greg 1.17 pp[0] = x;
373     pp[1] = y;
374     } else {
375     pp[0] = y;
376     pp[1] = x;
377     }
378     }
379    
380    
381 greg 1.5 int
382 greg 2.35 getviewopt( /* process view argument */
383     VIEW *v,
384     int ac,
385     char *av[]
386     )
387 greg 1.5 {
388 greg 1.16 #define check(c,l) if ((av[0][c]&&av[0][c]!=' ') || \
389     badarg(ac-1,av+1,l)) return(-1)
390 greg 1.5
391 greg 1.9 if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v')
392 greg 1.5 return(-1);
393     switch (av[0][2]) {
394     case 't': /* type */
395     if (!av[0][3] || av[0][3]==' ')
396     return(-1);
397 greg 1.16 check(4,"");
398 greg 1.5 v->type = av[0][3];
399     return(0);
400     case 'p': /* point */
401 greg 1.16 check(3,"fff");
402 greg 1.5 v->vp[0] = atof(av[1]);
403     v->vp[1] = atof(av[2]);
404     v->vp[2] = atof(av[3]);
405     return(3);
406     case 'd': /* direction */
407 greg 1.16 check(3,"fff");
408 greg 1.5 v->vdir[0] = atof(av[1]);
409     v->vdir[1] = atof(av[2]);
410     v->vdir[2] = atof(av[3]);
411 greg 2.30 v->vdist = 1.;
412 greg 1.5 return(3);
413     case 'u': /* up */
414 greg 1.16 check(3,"fff");
415 greg 1.5 v->vup[0] = atof(av[1]);
416     v->vup[1] = atof(av[2]);
417     v->vup[2] = atof(av[3]);
418     return(3);
419     case 'h': /* horizontal size */
420 greg 1.16 check(3,"f");
421 greg 1.5 v->horiz = atof(av[1]);
422     return(1);
423     case 'v': /* vertical size */
424 greg 1.16 check(3,"f");
425 greg 1.5 v->vert = atof(av[1]);
426     return(1);
427 greg 2.7 case 'o': /* fore clipping plane */
428     check(3,"f");
429     v->vfore = atof(av[1]);
430     return(1);
431     case 'a': /* aft clipping plane */
432     check(3,"f");
433     v->vaft = atof(av[1]);
434     return(1);
435 greg 1.5 case 's': /* shift */
436 greg 1.16 check(3,"f");
437 greg 1.5 v->hoff = atof(av[1]);
438     return(1);
439     case 'l': /* lift */
440 greg 1.16 check(3,"f");
441 greg 1.5 v->voff = atof(av[1]);
442     return(1);
443     default:
444     return(-1);
445     }
446     #undef check
447     }
448    
449    
450     int
451 greg 2.35 sscanview( /* get view parameters from string */
452     VIEW *vp,
453     char *s
454     )
455 greg 1.1 {
456 greg 1.5 int ac;
457     char *av[4];
458     int na;
459     int nvopts = 0;
460    
461 greg 2.32 while (isspace(*s))
462     if (!*s++)
463     return(0);
464 greg 1.9 while (*s) {
465 greg 1.5 ac = 0;
466     do {
467 greg 2.21 if (ac || *s == '-')
468     av[ac++] = s;
469 greg 2.32 while (*s && !isspace(*s))
470 greg 1.5 s++;
471 greg 2.32 while (isspace(*s))
472 greg 1.5 s++;
473     } while (*s && ac < 4);
474     if ((na = getviewopt(vp, ac, av)) >= 0) {
475     if (na+1 < ac)
476     s = av[na+1];
477     nvopts++;
478 greg 1.9 } else if (ac > 1)
479     s = av[1];
480     }
481 greg 1.5 return(nvopts);
482 greg 1.1 }
483    
484    
485 greg 2.16 void
486 greg 2.35 fprintview( /* write out view parameters */
487     VIEW *vp,
488     FILE *fp
489     )
490 greg 1.1 {
491     fprintf(fp, " -vt%c", vp->type);
492     fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]);
493 greg 2.29 fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0]*vp->vdist,
494     vp->vdir[1]*vp->vdist,
495     vp->vdir[2]*vp->vdist);
496 greg 1.1 fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]);
497     fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert);
498 greg 2.7 fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft);
499 greg 1.9 fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff);
500 greg 2.11 }
501    
502    
503     char *
504 greg 2.35 viewopt( /* translate to minimal view string */
505     VIEW *vp
506     )
507 greg 2.11 {
508     static char vwstr[128];
509 greg 2.36 char *cp = vwstr;
510 greg 2.11
511 greg 2.33 *cp = '\0';
512 greg 2.11 if (vp->type != stdview.type) {
513     sprintf(cp, " -vt%c", vp->type);
514     cp += strlen(cp);
515     }
516     if (!VEQ(vp->vp,stdview.vp)) {
517     sprintf(cp, " -vp %.6g %.6g %.6g",
518     vp->vp[0], vp->vp[1], vp->vp[2]);
519     cp += strlen(cp);
520     }
521 greg 2.29 if (!FEQ(vp->vdist,stdview.vdist) || !VEQ(vp->vdir,stdview.vdir)) {
522 greg 2.11 sprintf(cp, " -vd %.6g %.6g %.6g",
523 greg 2.29 vp->vdir[0]*vp->vdist,
524     vp->vdir[1]*vp->vdist,
525     vp->vdir[2]*vp->vdist);
526 greg 2.11 cp += strlen(cp);
527     }
528     if (!VEQ(vp->vup,stdview.vup)) {
529     sprintf(cp, " -vu %.6g %.6g %.6g",
530     vp->vup[0], vp->vup[1], vp->vup[2]);
531     cp += strlen(cp);
532     }
533     if (!FEQ(vp->horiz,stdview.horiz)) {
534     sprintf(cp, " -vh %.6g", vp->horiz);
535     cp += strlen(cp);
536     }
537     if (!FEQ(vp->vert,stdview.vert)) {
538     sprintf(cp, " -vv %.6g", vp->vert);
539     cp += strlen(cp);
540     }
541     if (!FEQ(vp->vfore,stdview.vfore)) {
542     sprintf(cp, " -vo %.6g", vp->vfore);
543     cp += strlen(cp);
544     }
545     if (!FEQ(vp->vaft,stdview.vaft)) {
546     sprintf(cp, " -va %.6g", vp->vaft);
547     cp += strlen(cp);
548     }
549     if (!FEQ(vp->hoff,stdview.hoff)) {
550     sprintf(cp, " -vs %.6g", vp->hoff);
551     cp += strlen(cp);
552     }
553     if (!FEQ(vp->voff,stdview.voff)) {
554     sprintf(cp, " -vl %.6g", vp->voff);
555     cp += strlen(cp);
556     }
557     return(vwstr);
558 greg 1.1 }
559    
560    
561 greg 2.3 int
562 greg 2.35 isview( /* is this a view string? */
563     char *s
564     )
565 greg 2.3 {
566 greg 2.25 static char *altname[]={NULL,VIEWSTR,"rpict","rview","rvu","rpiece","pinterp",NULL};
567 greg 2.5 extern char *progname;
568 greg 2.36 char *cp;
569     char **an;
570 greg 2.3 /* add program name to list */
571 greg 2.5 if (altname[0] == NULL) {
572     for (cp = progname; *cp; cp++)
573     ;
574     while (cp > progname && !ISDIRSEP(cp[-1]))
575     cp--;
576     altname[0] = cp;
577     }
578 greg 2.3 /* skip leading path */
579     cp = s;
580     while (*cp && *cp != ' ')
581     cp++;
582 greg 2.5 while (cp > s && !ISDIRSEP(cp[-1]))
583 greg 2.3 cp--;
584     for (an = altname; *an != NULL; an++)
585     if (!strncmp(*an, cp, strlen(*an)))
586     return(1);
587     return(0);
588     }
589 greg 1.1
590 greg 2.3
591 greg 1.15 struct myview {
592     VIEW *hv;
593     int ok;
594     };
595 greg 1.1
596 greg 1.15
597 gwlarson 2.14 static int
598 schorsch 2.26 gethview( /* get view from header */
599     char *s,
600     void *v
601     )
602 greg 1.1 {
603 schorsch 2.26 if (isview(s) && sscanview(((struct myview*)v)->hv, s) > 0)
604     ((struct myview*)v)->ok++;
605 gwlarson 2.14 return(0);
606 greg 1.1 }
607    
608    
609     int
610 greg 2.35 viewfile( /* get view from file */
611     char *fname,
612     VIEW *vp,
613     RESOLU *rp
614     )
615 greg 1.1 {
616 greg 1.15 struct myview mvs;
617 greg 1.1 FILE *fp;
618    
619 greg 2.16 if (fname == NULL || !strcmp(fname, "-"))
620     fp = stdin;
621     else if ((fp = fopen(fname, "r")) == NULL)
622 greg 1.1 return(-1);
623    
624 greg 1.15 mvs.hv = vp;
625     mvs.ok = 0;
626 greg 1.1
627 schorsch 2.26 getheader(fp, gethview, &mvs);
628 greg 1.8
629 greg 1.17 if (rp != NULL && !fgetsresolu(rp, fp))
630 greg 1.15 mvs.ok = 0;
631 greg 1.1
632     fclose(fp);
633    
634 greg 1.15 return(mvs.ok);
635 greg 1.1 }