1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: image.c,v 2.44 2018/01/24 17:22:24 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 <ctype.h> |
13 |
#include "rtio.h" |
14 |
#include "rtmath.h" |
15 |
#include "paths.h" |
16 |
#include "view.h" |
17 |
|
18 |
|
19 |
#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 |
VIEW stdview = STDVIEW; /* default view parameters */ |
24 |
|
25 |
static gethfunc gethview; |
26 |
|
27 |
|
28 |
char * |
29 |
setview( /* set hvec and vvec, return message on error */ |
30 |
VIEW *v |
31 |
) |
32 |
{ |
33 |
static char ill_horiz[] = "illegal horizontal view size"; |
34 |
static char ill_vert[] = "illegal vertical view size"; |
35 |
|
36 |
if ((v->vfore < -FTINY) | (v->vaft < -FTINY) || |
37 |
(v->vaft > FTINY) & (v->vaft <= v->vfore)) |
38 |
return("illegal fore/aft clipping plane"); |
39 |
|
40 |
if (v->vdist <= FTINY) |
41 |
return("illegal view distance"); |
42 |
v->vdist *= normalize(v->vdir); /* normalize direction */ |
43 |
if (v->vdist == 0.0) |
44 |
return("zero view direction"); |
45 |
|
46 |
if (normalize(v->vup) == 0.0) /* normalize view up */ |
47 |
return("zero view up vector"); |
48 |
|
49 |
fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */ |
50 |
|
51 |
if (normalize(v->hvec) == 0.0) |
52 |
return("view up parallel to view direction"); |
53 |
|
54 |
fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
55 |
|
56 |
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 |
v->hn2 = v->horiz; |
64 |
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 |
v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
72 |
v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
73 |
break; |
74 |
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 |
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 |
v->hn2 = v->horiz * (PI/180.0); |
88 |
v->vn2 = v->vert * (PI/180.0); |
89 |
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 |
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 |
default: |
109 |
return("unknown view type"); |
110 |
} |
111 |
if (v->type != VT_ANG && v->type != VT_PLS) { |
112 |
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 |
v->vvec[0] *= v->vn2; |
118 |
v->vvec[1] *= v->vn2; |
119 |
v->vvec[2] *= v->vn2; |
120 |
} |
121 |
v->hn2 *= v->hn2; |
122 |
v->vn2 *= v->vn2; |
123 |
|
124 |
return(NULL); |
125 |
} |
126 |
|
127 |
|
128 |
void |
129 |
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 |
{ |
136 |
if (*ap <= FTINY) |
137 |
*ap = va * *xp / *yp; /* compute pixel aspect */ |
138 |
else if (va * *xp > *ap * *yp) |
139 |
*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
140 |
else |
141 |
*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
142 |
} |
143 |
|
144 |
|
145 |
double |
146 |
viewray( /* compute ray origin and direction */ |
147 |
FVECT orig, |
148 |
FVECT direc, |
149 |
VIEW *v, |
150 |
double x, |
151 |
double y |
152 |
) |
153 |
{ |
154 |
double d, z; |
155 |
|
156 |
x += v->hoff - 0.5; |
157 |
y += v->voff - 0.5; |
158 |
|
159 |
switch(v->type) { |
160 |
case VT_PAR: /* parallel view */ |
161 |
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 |
VCOPY(direc, v->vdir); |
168 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
169 |
case VT_PER: /* perspective view */ |
170 |
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 |
VSUM(orig, v->vp, direc, v->vfore); |
174 |
d = normalize(direc); |
175 |
return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
176 |
case VT_HEM: /* hemispherical fisheye */ |
177 |
z = 1.0 - x*x*v->hn2 - y*y*v->vn2; |
178 |
if (z < 0.0) |
179 |
return(-1.0); |
180 |
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 |
VSUM(orig, v->vp, direc, v->vfore); |
185 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
186 |
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 |
VSUM(orig, v->vp, direc, v->vfore); |
194 |
d = normalize(direc); |
195 |
return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
196 |
case VT_ANG: /* angular fisheye */ |
197 |
x *= (1.0/180.0)*v->horiz; |
198 |
y *= (1.0/180.0)*v->vert; |
199 |
d = x*x + y*y; |
200 |
if (d > 1.0) |
201 |
return(-1.0); |
202 |
d = sqrt(d); |
203 |
z = cos(PI*d); |
204 |
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 |
VSUM(orig, v->vp, direc, v->vfore); |
211 |
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 |
x *= (1. + z); |
218 |
y *= (1. + z); |
219 |
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 |
VSUM(orig, v->vp, direc, v->vfore); |
223 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
224 |
} |
225 |
return(-1.0); |
226 |
} |
227 |
|
228 |
|
229 |
int |
230 |
viewloc( /* find image location for point */ |
231 |
FVECT ip, |
232 |
VIEW *v, |
233 |
FVECT p |
234 |
) /* returns: Good=1, Bad=0, Behind=-1, OutOfFrame=2, Behind+OOF=-2 */ |
235 |
{ |
236 |
double d, d2; |
237 |
FVECT disp; |
238 |
|
239 |
VSUB(disp, p, v->vp); |
240 |
|
241 |
switch (v->type) { |
242 |
case VT_PAR: /* parallel view */ |
243 |
ip[2] = DOT(disp,v->vdir) - v->vfore; |
244 |
break; |
245 |
case VT_PER: /* perspective view */ |
246 |
d = DOT(disp,v->vdir); |
247 |
ip[2] = VLEN(disp); |
248 |
if (d < -FTINY) { /* fold pyramid */ |
249 |
ip[2] = -ip[2]; |
250 |
d = -d; |
251 |
} else if (d <= FTINY) |
252 |
return(0); /* at infinite edge */ |
253 |
d = 1.0/d; |
254 |
disp[0] *= d; |
255 |
disp[1] *= d; |
256 |
disp[2] *= d; |
257 |
if (ip[2] < 0.0) d = -d; |
258 |
ip[2] *= (1.0 - v->vfore*d); |
259 |
break; |
260 |
case VT_HEM: /* hemispherical fisheye */ |
261 |
d = normalize(disp); |
262 |
if (DOT(disp,v->vdir) < 0.0) |
263 |
ip[2] = -d; |
264 |
else |
265 |
ip[2] = d; |
266 |
ip[2] -= v->vfore; |
267 |
break; |
268 |
case VT_CYL: /* cylindrical panorama */ |
269 |
d = DOT(disp,v->hvec); |
270 |
d2 = DOT(disp,v->vdir); |
271 |
ip[0] = 180.0/PI * atan2(d,d2) / v->horiz + 0.5 - v->hoff; |
272 |
d = d*d + d2*d2; |
273 |
if (d <= FTINY*FTINY) |
274 |
return(0); /* at pole */ |
275 |
d = 1.0/sqrt(d); |
276 |
ip[1] = DOT(disp,v->vvec)*d/v->vn2 + 0.5 - v->voff; |
277 |
ip[2] = VLEN(disp); |
278 |
ip[2] *= (1.0 - v->vfore*d); |
279 |
goto gotall; |
280 |
case VT_ANG: /* angular fisheye */ |
281 |
ip[0] = 0.5 - v->hoff; |
282 |
ip[1] = 0.5 - v->voff; |
283 |
ip[2] = normalize(disp) - v->vfore; |
284 |
d = DOT(disp,v->vdir); |
285 |
if (d >= 1.0-FTINY) |
286 |
goto gotall; |
287 |
if (d <= -(1.0-FTINY)) { |
288 |
ip[0] += 180.0/v->horiz; |
289 |
goto gotall; |
290 |
} |
291 |
d = (180.0/PI)*acos(d) / sqrt(1.0 - d*d); |
292 |
ip[0] += DOT(disp,v->hvec)*d/v->horiz; |
293 |
ip[1] += DOT(disp,v->vvec)*d/v->vert; |
294 |
goto gotall; |
295 |
case VT_PLS: /* planispheric fisheye */ |
296 |
ip[0] = 0.5 - v->hoff; |
297 |
ip[1] = 0.5 - v->voff; |
298 |
ip[2] = normalize(disp) - v->vfore; |
299 |
d = DOT(disp,v->vdir); |
300 |
if (d >= 1.0-FTINY) |
301 |
goto gotall; |
302 |
if (d <= -(1.0-FTINY)) |
303 |
return(0); |
304 |
ip[0] += DOT(disp,v->hvec)/((1. + d)*sqrt(v->hn2)); |
305 |
ip[1] += DOT(disp,v->vvec)/((1. + d)*sqrt(v->vn2)); |
306 |
goto gotall; |
307 |
default: |
308 |
return(0); |
309 |
} |
310 |
ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
311 |
ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
312 |
gotall: /* compute return value */ |
313 |
return( (1 - 2*(ip[2] <= 0.0)) * (1 + |
314 |
((0.0 >= ip[0]) | (ip[0] >= 1.0) | (0.0 >= ip[1]) | (ip[1] >= 1.0))) ); |
315 |
} |
316 |
|
317 |
|
318 |
void |
319 |
pix2loc( /* compute image location from pixel pos. */ |
320 |
RREAL loc[2], |
321 |
RESOLU *rp, |
322 |
int px, |
323 |
int py |
324 |
) |
325 |
{ |
326 |
int x, y; |
327 |
|
328 |
if (rp->rt & YMAJOR) { |
329 |
x = px; |
330 |
y = py; |
331 |
} else { |
332 |
x = py; |
333 |
y = px; |
334 |
} |
335 |
if (rp->rt & XDECR) |
336 |
x = rp->xr-1 - x; |
337 |
if (rp->rt & YDECR) |
338 |
y = rp->yr-1 - y; |
339 |
loc[0] = (x+.5)/rp->xr; |
340 |
loc[1] = (y+.5)/rp->yr; |
341 |
} |
342 |
|
343 |
|
344 |
void |
345 |
loc2pix( /* compute pixel pos. from image location */ |
346 |
int pp[2], |
347 |
RESOLU *rp, |
348 |
double lx, |
349 |
double ly |
350 |
) |
351 |
{ |
352 |
int x, y; |
353 |
|
354 |
x = (int)(lx*rp->xr + .5 - (lx < 0.0)); |
355 |
y = (int)(ly*rp->yr + .5 - (ly < 0.0)); |
356 |
|
357 |
if (rp->rt & XDECR) |
358 |
x = rp->xr-1 - x; |
359 |
if (rp->rt & YDECR) |
360 |
y = rp->yr-1 - y; |
361 |
if (rp->rt & YMAJOR) { |
362 |
pp[0] = x; |
363 |
pp[1] = y; |
364 |
} else { |
365 |
pp[0] = y; |
366 |
pp[1] = x; |
367 |
} |
368 |
} |
369 |
|
370 |
|
371 |
int |
372 |
getviewopt( /* process view argument */ |
373 |
VIEW *v, |
374 |
int ac, |
375 |
char *av[] |
376 |
) |
377 |
{ |
378 |
#define check(c,l) if ((av[0][c]&&av[0][c]!=' ') || \ |
379 |
badarg(ac-1,av+1,l)) return(-1) |
380 |
|
381 |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
382 |
return(-1); |
383 |
switch (av[0][2]) { |
384 |
case 't': /* type */ |
385 |
if (!av[0][3] || av[0][3]==' ') |
386 |
return(-1); |
387 |
check(4,""); |
388 |
v->type = av[0][3]; |
389 |
return(0); |
390 |
case 'p': /* point */ |
391 |
check(3,"fff"); |
392 |
v->vp[0] = atof(av[1]); |
393 |
v->vp[1] = atof(av[2]); |
394 |
v->vp[2] = atof(av[3]); |
395 |
return(3); |
396 |
case 'd': /* direction */ |
397 |
check(3,"fff"); |
398 |
v->vdir[0] = atof(av[1]); |
399 |
v->vdir[1] = atof(av[2]); |
400 |
v->vdir[2] = atof(av[3]); |
401 |
v->vdist = 1.; |
402 |
return(3); |
403 |
case 'u': /* up */ |
404 |
check(3,"fff"); |
405 |
v->vup[0] = atof(av[1]); |
406 |
v->vup[1] = atof(av[2]); |
407 |
v->vup[2] = atof(av[3]); |
408 |
return(3); |
409 |
case 'h': /* horizontal size */ |
410 |
check(3,"f"); |
411 |
v->horiz = atof(av[1]); |
412 |
return(1); |
413 |
case 'v': /* vertical size */ |
414 |
check(3,"f"); |
415 |
v->vert = atof(av[1]); |
416 |
return(1); |
417 |
case 'o': /* fore clipping plane */ |
418 |
check(3,"f"); |
419 |
v->vfore = atof(av[1]); |
420 |
return(1); |
421 |
case 'a': /* aft clipping plane */ |
422 |
check(3,"f"); |
423 |
v->vaft = atof(av[1]); |
424 |
return(1); |
425 |
case 's': /* shift */ |
426 |
check(3,"f"); |
427 |
v->hoff = atof(av[1]); |
428 |
return(1); |
429 |
case 'l': /* lift */ |
430 |
check(3,"f"); |
431 |
v->voff = atof(av[1]); |
432 |
return(1); |
433 |
default: |
434 |
return(-1); |
435 |
} |
436 |
#undef check |
437 |
} |
438 |
|
439 |
|
440 |
int |
441 |
sscanview( /* get view parameters from string */ |
442 |
VIEW *vp, |
443 |
char *s |
444 |
) |
445 |
{ |
446 |
int ac; |
447 |
char *av[4]; |
448 |
int na; |
449 |
int nvopts = 0; |
450 |
|
451 |
while (isspace(*s)) |
452 |
if (!*s++) |
453 |
return(0); |
454 |
while (*s) { |
455 |
ac = 0; |
456 |
do { |
457 |
if (ac || *s == '-') |
458 |
av[ac++] = s; |
459 |
while (*s && !isspace(*s)) |
460 |
s++; |
461 |
while (isspace(*s)) |
462 |
s++; |
463 |
} while (*s && ac < 4); |
464 |
if ((na = getviewopt(vp, ac, av)) >= 0) { |
465 |
if (na+1 < ac) |
466 |
s = av[na+1]; |
467 |
nvopts++; |
468 |
} else if (ac > 1) |
469 |
s = av[1]; |
470 |
} |
471 |
return(nvopts); |
472 |
} |
473 |
|
474 |
|
475 |
void |
476 |
fprintview( /* write out view parameters */ |
477 |
VIEW *vp, |
478 |
FILE *fp |
479 |
) |
480 |
{ |
481 |
fprintf(fp, " -vt%c", vp->type); |
482 |
fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]); |
483 |
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0]*vp->vdist, |
484 |
vp->vdir[1]*vp->vdist, |
485 |
vp->vdir[2]*vp->vdist); |
486 |
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
487 |
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
488 |
fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft); |
489 |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
490 |
} |
491 |
|
492 |
|
493 |
char * |
494 |
viewopt( /* translate to minimal view string */ |
495 |
VIEW *vp |
496 |
) |
497 |
{ |
498 |
static char vwstr[128]; |
499 |
char *cp = vwstr; |
500 |
|
501 |
*cp = '\0'; |
502 |
if (vp->type != stdview.type) { |
503 |
sprintf(cp, " -vt%c", vp->type); |
504 |
cp += strlen(cp); |
505 |
} |
506 |
if (!VEQ(vp->vp,stdview.vp)) { |
507 |
sprintf(cp, " -vp %.6g %.6g %.6g", |
508 |
vp->vp[0], vp->vp[1], vp->vp[2]); |
509 |
cp += strlen(cp); |
510 |
} |
511 |
if (!FEQ(vp->vdist,stdview.vdist) || !VEQ(vp->vdir,stdview.vdir)) { |
512 |
sprintf(cp, " -vd %.6g %.6g %.6g", |
513 |
vp->vdir[0]*vp->vdist, |
514 |
vp->vdir[1]*vp->vdist, |
515 |
vp->vdir[2]*vp->vdist); |
516 |
cp += strlen(cp); |
517 |
} |
518 |
if (!VEQ(vp->vup,stdview.vup)) { |
519 |
sprintf(cp, " -vu %.6g %.6g %.6g", |
520 |
vp->vup[0], vp->vup[1], vp->vup[2]); |
521 |
cp += strlen(cp); |
522 |
} |
523 |
if (!FEQ(vp->horiz,stdview.horiz)) { |
524 |
sprintf(cp, " -vh %.6g", vp->horiz); |
525 |
cp += strlen(cp); |
526 |
} |
527 |
if (!FEQ(vp->vert,stdview.vert)) { |
528 |
sprintf(cp, " -vv %.6g", vp->vert); |
529 |
cp += strlen(cp); |
530 |
} |
531 |
if (!FEQ(vp->vfore,stdview.vfore)) { |
532 |
sprintf(cp, " -vo %.6g", vp->vfore); |
533 |
cp += strlen(cp); |
534 |
} |
535 |
if (!FEQ(vp->vaft,stdview.vaft)) { |
536 |
sprintf(cp, " -va %.6g", vp->vaft); |
537 |
cp += strlen(cp); |
538 |
} |
539 |
if (!FEQ(vp->hoff,stdview.hoff)) { |
540 |
sprintf(cp, " -vs %.6g", vp->hoff); |
541 |
cp += strlen(cp); |
542 |
} |
543 |
if (!FEQ(vp->voff,stdview.voff)) { |
544 |
sprintf(cp, " -vl %.6g", vp->voff); |
545 |
cp += strlen(cp); |
546 |
} |
547 |
return(vwstr); |
548 |
} |
549 |
|
550 |
|
551 |
int |
552 |
isview( /* is this a view string? */ |
553 |
char *s |
554 |
) |
555 |
{ |
556 |
static char *altname[]={NULL,VIEWSTR,"rpict","rview","rvu","rpiece","pinterp",NULL}; |
557 |
extern char *progname; |
558 |
char *cp; |
559 |
char **an; |
560 |
/* add program name to list */ |
561 |
if (altname[0] == NULL) { |
562 |
for (cp = progname; *cp; cp++) |
563 |
; |
564 |
while (cp > progname && !ISDIRSEP(cp[-1])) |
565 |
cp--; |
566 |
altname[0] = cp; |
567 |
} |
568 |
/* skip leading path */ |
569 |
cp = s; |
570 |
while (*cp && *cp != ' ') |
571 |
cp++; |
572 |
while (cp > s && !ISDIRSEP(cp[-1])) |
573 |
cp--; |
574 |
for (an = altname; *an != NULL; an++) |
575 |
if (!strncmp(*an, cp, strlen(*an))) |
576 |
return(1); |
577 |
return(0); |
578 |
} |
579 |
|
580 |
|
581 |
struct myview { |
582 |
VIEW *hv; |
583 |
int ok; |
584 |
}; |
585 |
|
586 |
|
587 |
static int |
588 |
gethview( /* get view from header */ |
589 |
char *s, |
590 |
void *v |
591 |
) |
592 |
{ |
593 |
if (isview(s) && sscanview(((struct myview*)v)->hv, s) > 0) |
594 |
((struct myview*)v)->ok++; |
595 |
return(0); |
596 |
} |
597 |
|
598 |
|
599 |
int |
600 |
viewfile( /* get view from file */ |
601 |
char *fname, |
602 |
VIEW *vp, |
603 |
RESOLU *rp |
604 |
) |
605 |
{ |
606 |
struct myview mvs; |
607 |
FILE *fp; |
608 |
|
609 |
if (fname == NULL || !strcmp(fname, "-")) |
610 |
fp = stdin; |
611 |
else if ((fp = fopen(fname, "r")) == NULL) |
612 |
return(-1); |
613 |
|
614 |
mvs.hv = vp; |
615 |
mvs.ok = 0; |
616 |
|
617 |
getheader(fp, gethview, &mvs); |
618 |
|
619 |
if (rp != NULL && !fgetsresolu(rp, fp)) |
620 |
mvs.ok = 0; |
621 |
|
622 |
fclose(fp); |
623 |
|
624 |
return(mvs.ok); |
625 |
} |