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root/radiance/ray/src/common/image.c
Revision: 2.55
Committed: Sat Jul 16 00:26:34 2022 UTC (22 months ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: rad5R4, HEAD
Changes since 2.54: +5 -5 lines
Log Message: 
perf: very minor optimization in viewloc()

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 greg 2.55 static const char RCSid[] = "$Id: image.c,v 2.54 2022/01/13 00:26:09 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 1.5 VIEW stdview = STDVIEW; /* default view parameters */
19 greg 1.1
20 schorsch 2.26 static gethfunc gethview;
21    
22 greg 1.1
23     char *
24 greg 2.35 setview( /* set hvec and vvec, return message on error */
25     VIEW *v
26     )
27 greg 1.3 {
28 greg 1.12 static char ill_horiz[] = "illegal horizontal view size";
29     static char ill_vert[] = "illegal vertical view size";
30    
31 greg 2.39 if ((v->vfore < -FTINY) | (v->vaft < -FTINY) ||
32     (v->vaft > FTINY) & (v->vaft <= v->vfore))
33 greg 2.7 return("illegal fore/aft clipping plane");
34    
35 greg 2.31 if (v->vdist <= FTINY)
36     return("illegal view distance");
37 greg 2.29 v->vdist *= normalize(v->vdir); /* normalize direction */
38     if (v->vdist == 0.0)
39 greg 1.1 return("zero view direction");
40    
41 greg 1.14 if (normalize(v->vup) == 0.0) /* normalize view up */
42     return("zero view up vector");
43    
44 greg 1.5 fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */
45    
46     if (normalize(v->hvec) == 0.0)
47 greg 1.14 return("view up parallel to view direction");
48 greg 1.1
49 greg 1.5 fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */
50    
51 greg 1.12 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 greg 1.5 v->hn2 = v->horiz;
59 greg 1.12 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 greg 2.53 v->hn2 = 2.0 * tan(v->horiz*(PI/360.));
67     v->vn2 = 2.0 * tan(v->vert*(PI/360.));
68 greg 1.12 break;
69 greg 2.9 case VT_CYL: /* cylindrical panorama */
70     if (v->horiz > 360.0+FTINY)
71     return(ill_horiz);
72     if (v->vert >= 180.0-FTINY)
73     return(ill_vert);
74     v->hn2 = v->horiz * (PI/180.0);
75 greg 2.53 v->vn2 = 2.0 * tan(v->vert*(PI/360.));
76 greg 2.9 break;
77 greg 1.12 case VT_ANG: /* angular fisheye */
78     if (v->horiz > 360.0+FTINY)
79     return(ill_horiz);
80     if (v->vert > 360.0+FTINY)
81     return(ill_vert);
82 greg 2.9 v->hn2 = v->horiz * (PI/180.0);
83     v->vn2 = v->vert * (PI/180.0);
84 greg 1.12 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 greg 2.53 v->hn2 = 2.0 * sin(v->horiz*(PI/360.));
91     v->vn2 = 2.0 * sin(v->vert*(PI/360.));
92 greg 1.12 break;
93 greg 2.34 case VT_PLS: /* planispheric fisheye */
94     if (v->horiz >= 360.0-FTINY)
95     return(ill_horiz);
96     if (v->vert >= 360.0-FTINY)
97     return(ill_vert);
98 greg 2.53 v->hn2 = 2.*sin(v->horiz*(PI/360.)) /
99     (1.0 + cos(v->horiz*(PI/360.)));
100     v->vn2 = 2.*sin(v->vert*(PI/360.)) /
101     (1.0 + cos(v->vert*(PI/360.)));
102 greg 2.34 break;
103 greg 1.12 default:
104 greg 1.1 return("unknown view type");
105 greg 1.12 }
106 greg 2.34 if (v->type != VT_ANG && v->type != VT_PLS) {
107 greg 2.9 if (v->type != VT_CYL) {
108     v->hvec[0] *= v->hn2;
109     v->hvec[1] *= v->hn2;
110     v->hvec[2] *= v->hn2;
111     }
112 greg 1.12 v->vvec[0] *= v->vn2;
113     v->vvec[1] *= v->vn2;
114     v->vvec[2] *= v->vn2;
115     }
116 greg 1.5 v->hn2 *= v->hn2;
117     v->vn2 *= v->vn2;
118 greg 1.1
119     return(NULL);
120     }
121    
122    
123 greg 2.53 char *
124     cropview( /* crop a view to the indicated bounds */
125     VIEW *v,
126     double x0,
127     double y0,
128     double x1,
129     double y1
130     )
131     {
132     static char ill_hemi[] = "illegal crop for hemispherical view";
133     double d;
134     /* order crop extrema */
135     if (x0 > x1) { d=x0; x0=x1; x1=d; }
136     if (y0 > y1) { d=y0; y0=y1; y1=d; }
137    
138 greg 2.54 if ((x1-x0 <= FTINY) | (y1-y0 <= FTINY))
139     return("zero crop area");
140    
141     d = x1 - x0; /* adjust horizontal size? */
142     if (!FABSEQ(d, 1.))
143 greg 2.53 switch (v->type) {
144     case VT_PER:
145     v->horiz = 360./PI*atan( d*tan(PI/360.*v->horiz) );
146     break;
147     case VT_PAR:
148     case VT_ANG:
149     case VT_CYL:
150     v->horiz *= d;
151     break;
152     case VT_HEM:
153     d *= sin(PI/360.*v->horiz);
154     if (d > 1.)
155     return(ill_hemi);
156     v->horiz = 360./PI*asin( d );
157     break;
158     case VT_PLS:
159     d *= sin(PI/360.*v->horiz) /
160     (1. + cos(PI/360.*v->horiz));
161     v->horiz = 360./PI*acos( (1. - d*d) / (1. + d*d) );
162     break;
163     }
164 greg 2.54
165     d = y1 - y0; /* adjust vertical size? */
166     if (!FABSEQ(d, 1.))
167 greg 2.53 switch (v->type) {
168     case VT_PER:
169     case VT_CYL:
170     v->vert = 360./PI*atan( d*tan(PI/360.*v->vert) );
171     break;
172     case VT_PAR:
173     case VT_ANG:
174     v->vert *= d;
175     break;
176     case VT_HEM:
177     d *= sin(PI/360.*v->vert);
178     if (d > 1.)
179     return(ill_hemi);
180     v->vert = 360./PI*asin( d );
181     break;
182     case VT_PLS:
183     d *= sin(PI/360.*v->vert) /
184     (1. + cos(PI/360.*v->vert));
185     v->vert = 360./PI*acos( (1. - d*d) / (1. + d*d) );
186     break;
187     }
188 greg 2.54 /* adjust offsets */
189 greg 2.53 v->hoff = ((x0 + x1)*.5 - .5 + v->hoff) / (x1 - x0);
190     v->voff = ((y0 + y1)*.5 - .5 + v->voff) / (y1 - y0);
191    
192     return(setview(v)); /* final error checks & set-up */
193     }
194    
195    
196 greg 2.16 void
197 greg 2.35 normaspect( /* fix pixel aspect or resolution */
198     double va, /* view aspect ratio */
199     double *ap, /* pixel aspect in (or out if 0) */
200     int *xp,
201     int *yp /* x and y resolution in (or out if *ap!=0) */
202     )
203 greg 1.6 {
204     if (*ap <= FTINY)
205 greg 1.7 *ap = va * *xp / *yp; /* compute pixel aspect */
206 greg 1.6 else if (va * *xp > *ap * *yp)
207 greg 1.10 *xp = *yp / va * *ap + .5; /* reduce x resolution */
208 greg 1.6 else
209 greg 1.10 *yp = *xp * va / *ap + .5; /* reduce y resolution */
210 greg 1.6 }
211    
212    
213 greg 2.7 double
214 greg 2.35 viewray( /* compute ray origin and direction */
215     FVECT orig,
216     FVECT direc,
217     VIEW *v,
218     double x,
219     double y
220     )
221 greg 1.1 {
222 greg 1.12 double d, z;
223    
224 greg 1.5 x += v->hoff - 0.5;
225     y += v->voff - 0.5;
226 greg 1.1
227 greg 1.12 switch(v->type) {
228     case VT_PAR: /* parallel view */
229 greg 2.7 orig[0] = v->vp[0] + v->vfore*v->vdir[0]
230     + x*v->hvec[0] + y*v->vvec[0];
231     orig[1] = v->vp[1] + v->vfore*v->vdir[1]
232     + x*v->hvec[1] + y*v->vvec[1];
233     orig[2] = v->vp[2] + v->vfore*v->vdir[2]
234     + x*v->hvec[2] + y*v->vvec[2];
235 greg 1.1 VCOPY(direc, v->vdir);
236 greg 2.8 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
237 greg 1.12 case VT_PER: /* perspective view */
238 greg 1.5 direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
239     direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
240     direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
241 greg 2.40 VSUM(orig, v->vp, direc, v->vfore);
242 greg 2.7 d = normalize(direc);
243 greg 2.8 return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
244 greg 1.12 case VT_HEM: /* hemispherical fisheye */
245 greg 1.13 z = 1.0 - x*x*v->hn2 - y*y*v->vn2;
246 greg 1.12 if (z < 0.0)
247 greg 2.7 return(-1.0);
248 greg 1.12 z = sqrt(z);
249     direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
250     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
251     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
252 greg 2.40 VSUM(orig, v->vp, direc, v->vfore);
253 greg 2.8 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
254 greg 2.9 case VT_CYL: /* cylindrical panorama */
255     d = x * v->horiz * (PI/180.0);
256     z = cos(d);
257     x = sin(d);
258     direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
259     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
260     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
261 greg 2.40 VSUM(orig, v->vp, direc, v->vfore);
262 greg 2.9 d = normalize(direc);
263     return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
264 greg 1.12 case VT_ANG: /* angular fisheye */
265 greg 2.34 x *= (1.0/180.0)*v->horiz;
266     y *= (1.0/180.0)*v->vert;
267 greg 1.12 d = x*x + y*y;
268     if (d > 1.0)
269 greg 2.7 return(-1.0);
270 greg 1.12 d = sqrt(d);
271     z = cos(PI*d);
272 greg 2.34 d = d <= FTINY ? PI : sqrt(1.0 - z*z)/d;
273     x *= d;
274     y *= d;
275     direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
276     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
277     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
278 greg 2.40 VSUM(orig, v->vp, direc, v->vfore);
279 greg 2.34 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
280     case VT_PLS: /* planispheric fisheye */
281     x *= sqrt(v->hn2);
282     y *= sqrt(v->vn2);
283     d = x*x + y*y;
284     z = (1. - d)/(1. + d);
285 greg 2.38 x *= (1. + z);
286     y *= (1. + z);
287 greg 1.12 direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
288     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
289     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
290 greg 2.40 VSUM(orig, v->vp, direc, v->vfore);
291 greg 2.8 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
292 greg 1.1 }
293 greg 2.7 return(-1.0);
294 greg 1.1 }
295    
296    
297 greg 2.41 int
298 greg 2.35 viewloc( /* find image location for point */
299     FVECT ip,
300     VIEW *v,
301     FVECT p
302 greg 2.46 ) /* Use VL_* flags to interpret return value */
303 greg 1.3 {
304 greg 2.46 int rflags = VL_GOOD;
305 gregl 2.13 double d, d2;
306 greg 1.3 FVECT disp;
307 greg 1.5
308 greg 2.34 VSUB(disp, p, v->vp);
309 greg 1.3
310 greg 1.12 switch (v->type) {
311     case VT_PAR: /* parallel view */
312 greg 2.7 ip[2] = DOT(disp,v->vdir) - v->vfore;
313 greg 1.13 break;
314 greg 1.12 case VT_PER: /* perspective view */
315 greg 1.11 d = DOT(disp,v->vdir);
316 greg 2.55 rflags |= VL_BEYOND*((v->vaft > FTINY) &
317     (d >= v->vaft));
318 gregl 2.13 ip[2] = VLEN(disp);
319 greg 2.42 if (d < -FTINY) { /* fold pyramid */
320 greg 1.17 ip[2] = -ip[2];
321 greg 1.11 d = -d;
322 greg 2.42 } else if (d <= FTINY)
323 greg 2.46 return(VL_BAD); /* at infinite edge */
324 greg 2.41 d = 1.0/d;
325     disp[0] *= d;
326     disp[1] *= d;
327     disp[2] *= d;
328 greg 2.42 if (ip[2] < 0.0) d = -d;
329 greg 2.7 ip[2] *= (1.0 - v->vfore*d);
330 greg 1.13 break;
331 greg 1.12 case VT_HEM: /* hemispherical fisheye */
332     d = normalize(disp);
333 greg 1.17 if (DOT(disp,v->vdir) < 0.0)
334     ip[2] = -d;
335     else
336     ip[2] = d;
337 greg 2.7 ip[2] -= v->vfore;
338 greg 1.13 break;
339 greg 2.9 case VT_CYL: /* cylindrical panorama */
340     d = DOT(disp,v->hvec);
341 gregl 2.13 d2 = DOT(disp,v->vdir);
342     ip[0] = 180.0/PI * atan2(d,d2) / v->horiz + 0.5 - v->hoff;
343 greg 2.51 d2 = d*d + d2*d2;
344     if (d2 <= FTINY*FTINY)
345 greg 2.46 return(VL_BAD); /* at pole */
346 greg 2.55 rflags |= VL_BEYOND*((v->vaft > FTINY) &
347     (d2 >= v->vaft*v->vaft));
348 greg 2.51 d = 1.0/sqrt(d2);
349 gregl 2.13 ip[1] = DOT(disp,v->vvec)*d/v->vn2 + 0.5 - v->voff;
350     ip[2] = VLEN(disp);
351 gwlarson 2.15 ip[2] *= (1.0 - v->vfore*d);
352 greg 2.42 goto gotall;
353 greg 1.12 case VT_ANG: /* angular fisheye */
354 greg 1.17 ip[0] = 0.5 - v->hoff;
355     ip[1] = 0.5 - v->voff;
356 greg 2.7 ip[2] = normalize(disp) - v->vfore;
357 greg 1.12 d = DOT(disp,v->vdir);
358     if (d >= 1.0-FTINY)
359 greg 2.42 goto gotall;
360 greg 1.12 if (d <= -(1.0-FTINY)) {
361 greg 2.7 ip[0] += 180.0/v->horiz;
362 greg 2.42 goto gotall;
363 greg 1.12 }
364 greg 2.34 d = (180.0/PI)*acos(d) / sqrt(1.0 - d*d);
365     ip[0] += DOT(disp,v->hvec)*d/v->horiz;
366     ip[1] += DOT(disp,v->vvec)*d/v->vert;
367 greg 2.42 goto gotall;
368 greg 2.34 case VT_PLS: /* planispheric fisheye */
369     ip[0] = 0.5 - v->hoff;
370     ip[1] = 0.5 - v->voff;
371     ip[2] = normalize(disp) - v->vfore;
372     d = DOT(disp,v->vdir);
373     if (d >= 1.0-FTINY)
374 greg 2.42 goto gotall;
375 greg 2.34 if (d <= -(1.0-FTINY))
376 greg 2.46 return(VL_BAD);
377 greg 2.38 ip[0] += DOT(disp,v->hvec)/((1. + d)*sqrt(v->hn2));
378     ip[1] += DOT(disp,v->vvec)/((1. + d)*sqrt(v->vn2));
379 greg 2.42 goto gotall;
380 greg 2.45 default:
381 greg 2.46 return(VL_BAD);
382 greg 1.3 }
383 greg 1.17 ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff;
384     ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff;
385 greg 2.46 gotall: /* add appropriate return flags */
386 greg 2.48 if (ip[2] <= 0.0)
387     rflags |= VL_BEHIND;
388     else if ((v->type != VT_PER) & (v->type != VT_CYL))
389     rflags |= VL_BEYOND*((v->vaft > FTINY) &
390     (ip[2] >= v->vaft - v->vfore));
391 greg 2.46 rflags |= VL_OUTSIDE*((0.0 >= ip[0]) | (ip[0] >= 1.0) |
392     (0.0 >= ip[1]) | (ip[1] >= 1.0));
393     return(rflags);
394 greg 1.3 }
395    
396    
397 greg 2.16 void
398 greg 2.35 pix2loc( /* compute image location from pixel pos. */
399     RREAL loc[2],
400     RESOLU *rp,
401     int px,
402     int py
403     )
404 greg 1.17 {
405 greg 2.36 int x, y;
406 greg 1.17
407 greg 2.16 if (rp->rt & YMAJOR) {
408 greg 1.17 x = px;
409     y = py;
410     } else {
411     x = py;
412     y = px;
413     }
414 greg 2.16 if (rp->rt & XDECR)
415 greg 1.17 x = rp->xr-1 - x;
416 greg 2.16 if (rp->rt & YDECR)
417 greg 1.17 y = rp->yr-1 - y;
418     loc[0] = (x+.5)/rp->xr;
419     loc[1] = (y+.5)/rp->yr;
420     }
421    
422    
423 greg 2.16 void
424 greg 2.35 loc2pix( /* compute pixel pos. from image location */
425     int pp[2],
426     RESOLU *rp,
427     double lx,
428     double ly
429     )
430 greg 1.17 {
431 greg 2.36 int x, y;
432 greg 1.17
433 greg 2.37 x = (int)(lx*rp->xr + .5 - (lx < 0.0));
434     y = (int)(ly*rp->yr + .5 - (ly < 0.0));
435    
436 greg 2.16 if (rp->rt & XDECR)
437 greg 1.17 x = rp->xr-1 - x;
438 greg 2.16 if (rp->rt & YDECR)
439 greg 1.17 y = rp->yr-1 - y;
440 greg 2.16 if (rp->rt & YMAJOR) {
441 greg 1.17 pp[0] = x;
442     pp[1] = y;
443     } else {
444     pp[0] = y;
445     pp[1] = x;
446     }
447     }
448    
449    
450 greg 1.5 int
451 greg 2.35 getviewopt( /* process view argument */
452     VIEW *v,
453     int ac,
454     char *av[]
455     )
456 greg 1.5 {
457 greg 2.49 #define check(c,l) if ((av[0][c]&&!isspace(av[0][c])) || \
458 greg 1.16 badarg(ac-1,av+1,l)) return(-1)
459 greg 1.5
460 greg 1.9 if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v')
461 greg 1.5 return(-1);
462     switch (av[0][2]) {
463     case 't': /* type */
464 greg 2.49 if (!av[0][3] || isspace(av[0][3]))
465 greg 1.5 return(-1);
466 greg 1.16 check(4,"");
467 greg 1.5 v->type = av[0][3];
468     return(0);
469     case 'p': /* point */
470 greg 1.16 check(3,"fff");
471 greg 1.5 v->vp[0] = atof(av[1]);
472     v->vp[1] = atof(av[2]);
473     v->vp[2] = atof(av[3]);
474     return(3);
475     case 'd': /* direction */
476 greg 1.16 check(3,"fff");
477 greg 1.5 v->vdir[0] = atof(av[1]);
478     v->vdir[1] = atof(av[2]);
479     v->vdir[2] = atof(av[3]);
480 greg 2.30 v->vdist = 1.;
481 greg 1.5 return(3);
482     case 'u': /* up */
483 greg 1.16 check(3,"fff");
484 greg 1.5 v->vup[0] = atof(av[1]);
485     v->vup[1] = atof(av[2]);
486     v->vup[2] = atof(av[3]);
487     return(3);
488     case 'h': /* horizontal size */
489 greg 1.16 check(3,"f");
490 greg 1.5 v->horiz = atof(av[1]);
491     return(1);
492     case 'v': /* vertical size */
493 greg 1.16 check(3,"f");
494 greg 1.5 v->vert = atof(av[1]);
495     return(1);
496 greg 2.7 case 'o': /* fore clipping plane */
497     check(3,"f");
498     v->vfore = atof(av[1]);
499     return(1);
500     case 'a': /* aft clipping plane */
501     check(3,"f");
502     v->vaft = atof(av[1]);
503     return(1);
504 greg 1.5 case 's': /* shift */
505 greg 1.16 check(3,"f");
506 greg 1.5 v->hoff = atof(av[1]);
507     return(1);
508     case 'l': /* lift */
509 greg 1.16 check(3,"f");
510 greg 1.5 v->voff = atof(av[1]);
511     return(1);
512     default:
513     return(-1);
514     }
515     #undef check
516     }
517    
518    
519     int
520 greg 2.35 sscanview( /* get view parameters from string */
521     VIEW *vp,
522     char *s
523     )
524 greg 1.1 {
525 greg 1.5 int ac;
526     char *av[4];
527     int na;
528     int nvopts = 0;
529    
530 greg 2.32 while (isspace(*s))
531     if (!*s++)
532     return(0);
533 greg 1.9 while (*s) {
534 greg 1.5 ac = 0;
535     do {
536 greg 2.21 if (ac || *s == '-')
537     av[ac++] = s;
538 greg 2.32 while (*s && !isspace(*s))
539 greg 1.5 s++;
540 greg 2.32 while (isspace(*s))
541 greg 1.5 s++;
542     } while (*s && ac < 4);
543     if ((na = getviewopt(vp, ac, av)) >= 0) {
544     if (na+1 < ac)
545     s = av[na+1];
546     nvopts++;
547 greg 1.9 } else if (ac > 1)
548     s = av[1];
549     }
550 greg 1.5 return(nvopts);
551 greg 1.1 }
552    
553    
554 greg 2.16 void
555 greg 2.35 fprintview( /* write out view parameters */
556     VIEW *vp,
557     FILE *fp
558     )
559 greg 1.1 {
560     fprintf(fp, " -vt%c", vp->type);
561     fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]);
562 greg 2.29 fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0]*vp->vdist,
563     vp->vdir[1]*vp->vdist,
564     vp->vdir[2]*vp->vdist);
565 greg 1.1 fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]);
566     fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert);
567 greg 2.7 fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft);
568 greg 1.9 fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff);
569 greg 2.11 }
570    
571    
572     char *
573 greg 2.35 viewopt( /* translate to minimal view string */
574     VIEW *vp
575     )
576 greg 2.11 {
577     static char vwstr[128];
578 greg 2.36 char *cp = vwstr;
579 greg 2.11
580 greg 2.33 *cp = '\0';
581 greg 2.11 if (vp->type != stdview.type) {
582     sprintf(cp, " -vt%c", vp->type);
583     cp += strlen(cp);
584     }
585 greg 2.52 if (!VABSEQ(vp->vp,stdview.vp)) {
586 greg 2.11 sprintf(cp, " -vp %.6g %.6g %.6g",
587     vp->vp[0], vp->vp[1], vp->vp[2]);
588     cp += strlen(cp);
589     }
590 greg 2.52 if (!FABSEQ(vp->vdist,stdview.vdist) || !VABSEQ(vp->vdir,stdview.vdir)) {
591 greg 2.11 sprintf(cp, " -vd %.6g %.6g %.6g",
592 greg 2.29 vp->vdir[0]*vp->vdist,
593     vp->vdir[1]*vp->vdist,
594     vp->vdir[2]*vp->vdist);
595 greg 2.11 cp += strlen(cp);
596     }
597 greg 2.52 if (!VABSEQ(vp->vup,stdview.vup)) {
598 greg 2.11 sprintf(cp, " -vu %.6g %.6g %.6g",
599     vp->vup[0], vp->vup[1], vp->vup[2]);
600     cp += strlen(cp);
601     }
602 greg 2.52 if (!FABSEQ(vp->horiz,stdview.horiz)) {
603 greg 2.11 sprintf(cp, " -vh %.6g", vp->horiz);
604     cp += strlen(cp);
605     }
606 greg 2.52 if (!FABSEQ(vp->vert,stdview.vert)) {
607 greg 2.11 sprintf(cp, " -vv %.6g", vp->vert);
608     cp += strlen(cp);
609     }
610 greg 2.52 if (!FABSEQ(vp->vfore,stdview.vfore)) {
611 greg 2.11 sprintf(cp, " -vo %.6g", vp->vfore);
612     cp += strlen(cp);
613     }
614 greg 2.52 if (!FABSEQ(vp->vaft,stdview.vaft)) {
615 greg 2.11 sprintf(cp, " -va %.6g", vp->vaft);
616     cp += strlen(cp);
617     }
618 greg 2.52 if (!FABSEQ(vp->hoff,stdview.hoff)) {
619 greg 2.11 sprintf(cp, " -vs %.6g", vp->hoff);
620     cp += strlen(cp);
621     }
622 greg 2.52 if (!FABSEQ(vp->voff,stdview.voff)) {
623 greg 2.11 sprintf(cp, " -vl %.6g", vp->voff);
624     cp += strlen(cp);
625     }
626     return(vwstr);
627 greg 1.1 }
628    
629    
630 greg 2.3 int
631 greg 2.35 isview( /* is this a view string? */
632     char *s
633     )
634 greg 2.3 {
635 greg 2.25 static char *altname[]={NULL,VIEWSTR,"rpict","rview","rvu","rpiece","pinterp",NULL};
636 greg 2.5 extern char *progname;
637 greg 2.36 char *cp;
638     char **an;
639 greg 2.3 /* add program name to list */
640 greg 2.5 if (altname[0] == NULL) {
641     for (cp = progname; *cp; cp++)
642     ;
643     while (cp > progname && !ISDIRSEP(cp[-1]))
644     cp--;
645     altname[0] = cp;
646     }
647 greg 2.3 /* skip leading path */
648     cp = s;
649 greg 2.49 while (*cp && !isspace(*cp))
650 greg 2.3 cp++;
651 greg 2.5 while (cp > s && !ISDIRSEP(cp[-1]))
652 greg 2.3 cp--;
653     for (an = altname; *an != NULL; an++)
654     if (!strncmp(*an, cp, strlen(*an)))
655     return(1);
656     return(0);
657     }
658 greg 1.1
659 greg 2.3
660 greg 1.15 struct myview {
661     VIEW *hv;
662     int ok;
663     };
664 greg 1.1
665 greg 1.15
666 gwlarson 2.14 static int
667 schorsch 2.26 gethview( /* get view from header */
668     char *s,
669     void *v
670     )
671 greg 1.1 {
672 schorsch 2.26 if (isview(s) && sscanview(((struct myview*)v)->hv, s) > 0)
673     ((struct myview*)v)->ok++;
674 gwlarson 2.14 return(0);
675 greg 1.1 }
676    
677    
678     int
679 greg 2.35 viewfile( /* get view from file */
680     char *fname,
681     VIEW *vp,
682     RESOLU *rp
683     )
684 greg 1.1 {
685 greg 1.15 struct myview mvs;
686 greg 1.1 FILE *fp;
687    
688 greg 2.16 if (fname == NULL || !strcmp(fname, "-"))
689     fp = stdin;
690     else if ((fp = fopen(fname, "r")) == NULL)
691 greg 1.1 return(-1);
692    
693 greg 1.15 mvs.hv = vp;
694     mvs.ok = 0;
695 greg 1.1
696 schorsch 2.26 getheader(fp, gethview, &mvs);
697 greg 1.8
698 greg 1.17 if (rp != NULL && !fgetsresolu(rp, fp))
699 greg 1.15 mvs.ok = 0;
700 greg 1.1
701 greg 2.50 if (fp != stdin)
702     fclose(fp);
703 greg 1.1
704 greg 1.15 return(mvs.ok);
705 greg 1.1 }