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root/radiance/ray/src/common/image.c
Revision: 2.12
Committed: Wed Jan 17 10:55:40 1996 UTC (28 years, 3 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.11: +1 -1 lines
Log Message: 
replaced sskip() behavior and added new sskip2() function

File Contents

# User Rev Content
1 greg 2.11 /* Copyright (c) 1996 Regents of the University of California */
2 greg 1.1
3     #ifndef lint
4     static char SCCSid[] = "$SunId$ LBL";
5     #endif
6    
7     /*
8     * image.c - routines for image generation.
9     */
10    
11     #include "standard.h"
12    
13     #include "view.h"
14    
15 greg 1.17 #include "resolu.h"
16    
17 greg 2.4 #include "paths.h"
18    
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    
26     char *
27 greg 1.5 setview(v) /* set hvec and vvec, return message on error */
28     register VIEW *v;
29 greg 1.3 {
30 greg 1.12 static char ill_horiz[] = "illegal horizontal view size";
31     static char ill_vert[] = "illegal vertical view size";
32    
33 greg 2.7 if (v->vfore < -FTINY || v->vaft < -FTINY ||
34     (v->vaft > FTINY && v->vaft <= v->vfore))
35     return("illegal fore/aft clipping plane");
36    
37 greg 1.1 if (normalize(v->vdir) == 0.0) /* normalize direction */
38     return("zero view direction");
39    
40 greg 1.14 if (normalize(v->vup) == 0.0) /* normalize view up */
41     return("zero view up vector");
42    
43 greg 1.5 fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */
44    
45     if (normalize(v->hvec) == 0.0)
46 greg 1.14 return("view up parallel to view direction");
47 greg 1.1
48 greg 1.5 fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */
49    
50 greg 1.12 if (v->horiz <= FTINY)
51     return(ill_horiz);
52     if (v->vert <= FTINY)
53     return(ill_vert);
54    
55     switch (v->type) {
56     case VT_PAR: /* parallel view */
57 greg 1.5 v->hn2 = v->horiz;
58 greg 1.12 v->vn2 = v->vert;
59     break;
60     case VT_PER: /* perspective view */
61     if (v->horiz >= 180.0-FTINY)
62     return(ill_horiz);
63     if (v->vert >= 180.0-FTINY)
64     return(ill_vert);
65 greg 1.5 v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0));
66 greg 1.12 v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
67     break;
68 greg 2.9 case VT_CYL: /* cylindrical panorama */
69     if (v->horiz > 360.0+FTINY)
70     return(ill_horiz);
71     if (v->vert >= 180.0-FTINY)
72     return(ill_vert);
73     v->hn2 = v->horiz * (PI/180.0);
74     v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
75     break;
76 greg 1.12 case VT_ANG: /* angular fisheye */
77     if (v->horiz > 360.0+FTINY)
78     return(ill_horiz);
79     if (v->vert > 360.0+FTINY)
80     return(ill_vert);
81 greg 2.9 v->hn2 = v->horiz * (PI/180.0);
82     v->vn2 = v->vert * (PI/180.0);
83 greg 1.12 break;
84     case VT_HEM: /* hemispherical fisheye */
85     if (v->horiz > 180.0+FTINY)
86     return(ill_horiz);
87     if (v->vert > 180.0+FTINY)
88     return(ill_vert);
89     v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0));
90     v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0));
91     break;
92     default:
93 greg 1.1 return("unknown view type");
94 greg 1.12 }
95 greg 1.13 if (v->type != VT_ANG) {
96 greg 2.9 if (v->type != VT_CYL) {
97     v->hvec[0] *= v->hn2;
98     v->hvec[1] *= v->hn2;
99     v->hvec[2] *= v->hn2;
100     }
101 greg 1.12 v->vvec[0] *= v->vn2;
102     v->vvec[1] *= v->vn2;
103     v->vvec[2] *= v->vn2;
104     }
105 greg 1.5 v->hn2 *= v->hn2;
106     v->vn2 *= v->vn2;
107 greg 1.1
108     return(NULL);
109     }
110    
111    
112 greg 1.7 normaspect(va, ap, xp, yp) /* fix pixel aspect or resolution */
113     double va; /* view aspect ratio */
114     double *ap; /* pixel aspect in (or out if 0) */
115     int *xp, *yp; /* x and y resolution in (or out if *ap!=0) */
116 greg 1.6 {
117     if (*ap <= FTINY)
118 greg 1.7 *ap = va * *xp / *yp; /* compute pixel aspect */
119 greg 1.6 else if (va * *xp > *ap * *yp)
120 greg 1.10 *xp = *yp / va * *ap + .5; /* reduce x resolution */
121 greg 1.6 else
122 greg 1.10 *yp = *xp * va / *ap + .5; /* reduce y resolution */
123 greg 1.6 }
124    
125    
126 greg 2.7 double
127 greg 1.5 viewray(orig, direc, v, x, y) /* compute ray origin and direction */
128 greg 1.1 FVECT orig, direc;
129     register VIEW *v;
130     double x, y;
131     {
132 greg 1.12 double d, z;
133    
134 greg 1.5 x += v->hoff - 0.5;
135     y += v->voff - 0.5;
136 greg 1.1
137 greg 1.12 switch(v->type) {
138     case VT_PAR: /* parallel view */
139 greg 2.7 orig[0] = v->vp[0] + v->vfore*v->vdir[0]
140     + x*v->hvec[0] + y*v->vvec[0];
141     orig[1] = v->vp[1] + v->vfore*v->vdir[1]
142     + x*v->hvec[1] + y*v->vvec[1];
143     orig[2] = v->vp[2] + v->vfore*v->vdir[2]
144     + x*v->hvec[2] + y*v->vvec[2];
145 greg 1.1 VCOPY(direc, v->vdir);
146 greg 2.8 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
147 greg 1.12 case VT_PER: /* perspective view */
148 greg 1.5 direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
149     direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
150     direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
151 greg 2.7 orig[0] = v->vp[0] + v->vfore*direc[0];
152     orig[1] = v->vp[1] + v->vfore*direc[1];
153     orig[2] = v->vp[2] + v->vfore*direc[2];
154     d = normalize(direc);
155 greg 2.8 return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
156 greg 1.12 case VT_HEM: /* hemispherical fisheye */
157 greg 1.13 z = 1.0 - x*x*v->hn2 - y*y*v->vn2;
158 greg 1.12 if (z < 0.0)
159 greg 2.7 return(-1.0);
160 greg 1.12 z = sqrt(z);
161     direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
162     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
163     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
164 greg 2.7 orig[0] = v->vp[0] + v->vfore*direc[0];
165     orig[1] = v->vp[1] + v->vfore*direc[1];
166     orig[2] = v->vp[2] + v->vfore*direc[2];
167 greg 2.8 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
168 greg 2.9 case VT_CYL: /* cylindrical panorama */
169     d = x * v->horiz * (PI/180.0);
170     z = cos(d);
171     x = sin(d);
172     direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
173     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
174     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
175     orig[0] = v->vp[0] + v->vfore*direc[0];
176     orig[1] = v->vp[1] + v->vfore*direc[1];
177     orig[2] = v->vp[2] + v->vfore*direc[2];
178     d = normalize(direc);
179     return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
180 greg 1.12 case VT_ANG: /* angular fisheye */
181     x *= v->horiz/180.0;
182     y *= v->vert/180.0;
183     d = x*x + y*y;
184     if (d > 1.0)
185 greg 2.7 return(-1.0);
186 greg 1.12 d = sqrt(d);
187     z = cos(PI*d);
188 greg 2.6 d = d <= FTINY ? PI : sqrt(1 - z*z)/d;
189 greg 1.12 x *= d;
190     y *= d;
191     direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
192     direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
193     direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
194 greg 2.7 orig[0] = v->vp[0] + v->vfore*direc[0];
195     orig[1] = v->vp[1] + v->vfore*direc[1];
196     orig[2] = v->vp[2] + v->vfore*direc[2];
197 greg 2.8 return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
198 greg 1.1 }
199 greg 2.7 return(-1.0);
200 greg 1.1 }
201    
202    
203 greg 1.17 viewloc(ip, v, p) /* find image location for point */
204     FVECT ip;
205 greg 1.3 register VIEW *v;
206     FVECT p;
207     {
208     double d;
209     FVECT disp;
210 greg 1.5
211 greg 1.3 disp[0] = p[0] - v->vp[0];
212     disp[1] = p[1] - v->vp[1];
213     disp[2] = p[2] - v->vp[2];
214    
215 greg 1.12 switch (v->type) {
216     case VT_PAR: /* parallel view */
217 greg 2.7 ip[2] = DOT(disp,v->vdir) - v->vfore;
218 greg 1.13 break;
219 greg 1.12 case VT_PER: /* perspective view */
220 greg 1.11 d = DOT(disp,v->vdir);
221 greg 1.17 ip[2] = sqrt(DOT(disp,disp));
222     if (d < 0.0) { /* fold pyramid */
223     ip[2] = -ip[2];
224 greg 1.11 d = -d;
225 greg 2.7 }
226     if (d > FTINY) {
227 greg 1.11 d = 1.0/d;
228     disp[0] *= d;
229     disp[1] *= d;
230     disp[2] *= d;
231     }
232 greg 2.7 ip[2] *= (1.0 - v->vfore*d);
233 greg 1.13 break;
234 greg 1.12 case VT_HEM: /* hemispherical fisheye */
235     d = normalize(disp);
236 greg 1.17 if (DOT(disp,v->vdir) < 0.0)
237     ip[2] = -d;
238     else
239     ip[2] = d;
240 greg 2.7 ip[2] -= v->vfore;
241 greg 1.13 break;
242 greg 2.9 case VT_CYL: /* cylindrical panorama */
243     ip[2] = DOT(disp,v->vdir);
244     d = DOT(disp,v->hvec);
245 greg 2.10 ip[0] = 180.0/PI * atan2(d,ip[2]) / v->horiz + 0.5 - v->hoff;
246 greg 2.9 ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff;
247     if (v->vfore > FTINY)
248     ip[2] = sqrt(DOT(disp,disp)) *
249     (1.0 - v->vfore/sqrt(d*d + ip[2]*ip[2]));
250     else
251     ip[2] = sqrt(DOT(disp,disp));
252     return;
253 greg 1.12 case VT_ANG: /* angular fisheye */
254 greg 1.17 ip[0] = 0.5 - v->hoff;
255     ip[1] = 0.5 - v->voff;
256 greg 2.7 ip[2] = normalize(disp) - v->vfore;
257 greg 1.12 d = DOT(disp,v->vdir);
258     if (d >= 1.0-FTINY)
259     return;
260     if (d <= -(1.0-FTINY)) {
261 greg 2.7 ip[0] += 180.0/v->horiz;
262 greg 1.12 return;
263     }
264     d = acos(d)/PI / sqrt(1.0 - d*d);
265 greg 1.17 ip[0] += DOT(disp,v->hvec)*d*180.0/v->horiz;
266     ip[1] += DOT(disp,v->vvec)*d*180.0/v->vert;
267 greg 1.12 return;
268 greg 1.3 }
269 greg 1.17 ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff;
270     ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff;
271 greg 1.3 }
272    
273    
274 greg 1.17 pix2loc(loc, rp, px, py) /* compute image location from pixel pos. */
275     FLOAT loc[2];
276     register RESOLU *rp;
277     int px, py;
278     {
279     register int x, y;
280    
281     if (rp->or & YMAJOR) {
282     x = px;
283     y = py;
284     } else {
285     x = py;
286     y = px;
287     }
288     if (rp->or & XDECR)
289     x = rp->xr-1 - x;
290     if (rp->or & YDECR)
291     y = rp->yr-1 - y;
292     loc[0] = (x+.5)/rp->xr;
293     loc[1] = (y+.5)/rp->yr;
294     }
295    
296    
297     loc2pix(pp, rp, lx, ly) /* compute pixel pos. from image location */
298     int pp[2];
299     register RESOLU *rp;
300     double lx, ly;
301     {
302     register int x, y;
303    
304     x = lx * rp->xr;
305     y = ly * rp->yr;
306     if (rp->or & XDECR)
307     x = rp->xr-1 - x;
308     if (rp->or & YDECR)
309     y = rp->yr-1 - y;
310     if (rp->or & YMAJOR) {
311     pp[0] = x;
312     pp[1] = y;
313     } else {
314     pp[0] = y;
315     pp[1] = x;
316     }
317     }
318    
319    
320 greg 1.5 int
321     getviewopt(v, ac, av) /* process view argument */
322     register VIEW *v;
323     int ac;
324     register char *av[];
325     {
326 greg 1.16 #define check(c,l) if ((av[0][c]&&av[0][c]!=' ') || \
327     badarg(ac-1,av+1,l)) return(-1)
328 greg 1.5
329 greg 1.9 if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v')
330 greg 1.5 return(-1);
331     switch (av[0][2]) {
332     case 't': /* type */
333     if (!av[0][3] || av[0][3]==' ')
334     return(-1);
335 greg 1.16 check(4,"");
336 greg 1.5 v->type = av[0][3];
337     return(0);
338     case 'p': /* point */
339 greg 1.16 check(3,"fff");
340 greg 1.5 v->vp[0] = atof(av[1]);
341     v->vp[1] = atof(av[2]);
342     v->vp[2] = atof(av[3]);
343     return(3);
344     case 'd': /* direction */
345 greg 1.16 check(3,"fff");
346 greg 1.5 v->vdir[0] = atof(av[1]);
347     v->vdir[1] = atof(av[2]);
348     v->vdir[2] = atof(av[3]);
349     return(3);
350     case 'u': /* up */
351 greg 1.16 check(3,"fff");
352 greg 1.5 v->vup[0] = atof(av[1]);
353     v->vup[1] = atof(av[2]);
354     v->vup[2] = atof(av[3]);
355     return(3);
356     case 'h': /* horizontal size */
357 greg 1.16 check(3,"f");
358 greg 1.5 v->horiz = atof(av[1]);
359     return(1);
360     case 'v': /* vertical size */
361 greg 1.16 check(3,"f");
362 greg 1.5 v->vert = atof(av[1]);
363     return(1);
364 greg 2.7 case 'o': /* fore clipping plane */
365     check(3,"f");
366     v->vfore = atof(av[1]);
367     return(1);
368     case 'a': /* aft clipping plane */
369     check(3,"f");
370     v->vaft = atof(av[1]);
371     return(1);
372 greg 1.5 case 's': /* shift */
373 greg 1.16 check(3,"f");
374 greg 1.5 v->hoff = atof(av[1]);
375     return(1);
376     case 'l': /* lift */
377 greg 1.16 check(3,"f");
378 greg 1.5 v->voff = atof(av[1]);
379     return(1);
380     default:
381     return(-1);
382     }
383     #undef check
384     }
385    
386    
387     int
388     sscanview(vp, s) /* get view parameters from string */
389     VIEW *vp;
390 greg 1.1 register char *s;
391     {
392 greg 1.5 int ac;
393     char *av[4];
394     int na;
395     int nvopts = 0;
396    
397 greg 2.3 if (*s != '-')
398 greg 2.12 s = sskip2(s,1);
399 greg 1.9 while (*s) {
400 greg 1.5 ac = 0;
401     do {
402     av[ac++] = s;
403     while (*s && *s != ' ')
404     s++;
405     while (*s == ' ')
406     s++;
407     } while (*s && ac < 4);
408     if ((na = getviewopt(vp, ac, av)) >= 0) {
409     if (na+1 < ac)
410     s = av[na+1];
411     nvopts++;
412 greg 1.9 } else if (ac > 1)
413     s = av[1];
414     }
415 greg 1.5 return(nvopts);
416 greg 1.1 }
417    
418    
419     fprintview(vp, fp) /* write out view parameters */
420     register VIEW *vp;
421     FILE *fp;
422     {
423     fprintf(fp, " -vt%c", vp->type);
424     fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]);
425     fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]);
426     fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]);
427     fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert);
428 greg 2.7 fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft);
429 greg 1.9 fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff);
430 greg 2.11 }
431    
432    
433     char *
434     viewopt(vp) /* translate to minimal view string */
435     register VIEW *vp;
436     {
437     static char vwstr[128];
438     register char *cp = vwstr;
439    
440     if (vp->type != stdview.type) {
441     sprintf(cp, " -vt%c", vp->type);
442     cp += strlen(cp);
443     }
444     if (!VEQ(vp->vp,stdview.vp)) {
445     sprintf(cp, " -vp %.6g %.6g %.6g",
446     vp->vp[0], vp->vp[1], vp->vp[2]);
447     cp += strlen(cp);
448     }
449     if (!VEQ(vp->vdir,stdview.vdir)) {
450     sprintf(cp, " -vd %.6g %.6g %.6g",
451     vp->vdir[0], vp->vdir[1], vp->vdir[2]);
452     cp += strlen(cp);
453     }
454     if (!VEQ(vp->vup,stdview.vup)) {
455     sprintf(cp, " -vu %.6g %.6g %.6g",
456     vp->vup[0], vp->vup[1], vp->vup[2]);
457     cp += strlen(cp);
458     }
459     if (!FEQ(vp->horiz,stdview.horiz)) {
460     sprintf(cp, " -vh %.6g", vp->horiz);
461     cp += strlen(cp);
462     }
463     if (!FEQ(vp->vert,stdview.vert)) {
464     sprintf(cp, " -vv %.6g", vp->vert);
465     cp += strlen(cp);
466     }
467     if (!FEQ(vp->vfore,stdview.vfore)) {
468     sprintf(cp, " -vo %.6g", vp->vfore);
469     cp += strlen(cp);
470     }
471     if (!FEQ(vp->vaft,stdview.vaft)) {
472     sprintf(cp, " -va %.6g", vp->vaft);
473     cp += strlen(cp);
474     }
475     if (!FEQ(vp->hoff,stdview.hoff)) {
476     sprintf(cp, " -vs %.6g", vp->hoff);
477     cp += strlen(cp);
478     }
479     if (!FEQ(vp->voff,stdview.voff)) {
480     sprintf(cp, " -vl %.6g", vp->voff);
481     cp += strlen(cp);
482     }
483     return(vwstr);
484 greg 1.1 }
485    
486    
487 greg 2.3 int
488     isview(s) /* is this a view string? */
489     char *s;
490     {
491 greg 2.5 static char *altname[]={NULL,VIEWSTR,"rpict","rview","pinterp",NULL};
492     extern char *progname;
493 greg 2.3 register char *cp;
494     register char **an;
495     /* add program name to list */
496 greg 2.5 if (altname[0] == NULL) {
497     for (cp = progname; *cp; cp++)
498     ;
499     while (cp > progname && !ISDIRSEP(cp[-1]))
500     cp--;
501     altname[0] = cp;
502     }
503 greg 2.3 /* skip leading path */
504     cp = s;
505     while (*cp && *cp != ' ')
506     cp++;
507 greg 2.5 while (cp > s && !ISDIRSEP(cp[-1]))
508 greg 2.3 cp--;
509     for (an = altname; *an != NULL; an++)
510     if (!strncmp(*an, cp, strlen(*an)))
511     return(1);
512     return(0);
513     }
514 greg 1.1
515 greg 2.3
516 greg 1.15 struct myview {
517     VIEW *hv;
518     int ok;
519     };
520 greg 1.1
521 greg 1.15
522 greg 1.1 static
523 greg 1.15 gethview(s, v) /* get view from header */
524 greg 1.1 char *s;
525 greg 1.15 register struct myview *v;
526 greg 1.1 {
527 greg 2.3 if (isview(s) && sscanview(v->hv, s) > 0)
528     v->ok++;
529 greg 1.1 }
530    
531    
532     int
533 greg 1.17 viewfile(fname, vp, rp) /* get view from file */
534 greg 1.1 char *fname;
535     VIEW *vp;
536 greg 1.17 RESOLU *rp;
537 greg 1.1 {
538 greg 1.15 struct myview mvs;
539 greg 1.1 FILE *fp;
540    
541     if ((fp = fopen(fname, "r")) == NULL)
542     return(-1);
543    
544 greg 1.15 mvs.hv = vp;
545     mvs.ok = 0;
546 greg 1.1
547 greg 1.15 getheader(fp, gethview, &mvs);
548 greg 1.8
549 greg 1.17 if (rp != NULL && !fgetsresolu(rp, fp))
550 greg 1.15 mvs.ok = 0;
551 greg 1.1
552     fclose(fp);
553    
554 greg 1.15 return(mvs.ok);
555 greg 1.1 }