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root/Development/ray/src/common/image.c

Comparing ray/src/common/image.c (file contents):
Revision 1.14 by greg, Mon Mar 18 13:48:05 1991 UTC vs.
Revision 2.11 by greg, Wed Jan 10 19:25:57 1996 UTC

#	Line 1 | Line 1
1	<	/* Copyright (c) 1986 Regents of the University of California */
1	>	/* Copyright (c) 1996 Regents of the University of California */
2
3		#ifndef lint
4		static char SCCSid[] = "$SunId$ LBL";
#	Line 6 | Line 6 | static char SCCSid[] = "$SunId$ LBL";
6
7		/*
8		*  image.c - routines for image generation.
9	–	*
10	–	*     10/17/85
9		*/
10
11		#include  "standard.h"
12
13		#include  "view.h"
14
15	+	#include  "resolu.h"
16	+
17	+	#include  "paths.h"
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
#	Line 24 | Line 30 | register VIEW  *v;
30		static char  ill_horiz[] = "illegal horizontal view size";
31		static char  ill_vert[] = "illegal vertical view size";
32
33	+	if (v->vfore < -FTINY || v->vaft < -FTINY ||
34	+	(v->vaft > FTINY && v->vaft <= v->vfore))
35	+	return("illegal fore/aft clipping plane");
36	+
37		if (normalize(v->vdir) == 0.0)          /* normalize direction */
38		return("zero view direction");
39
#	Line 55 | Line 65 | register VIEW  *v;
65		v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0));
66		v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
67		break;
68	+	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		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	<	v->hn2 = v->horiz / 90.0;
82	<	v->vn2 = v->vert / 90.0;
81	>	v->hn2 = v->horiz * (PI/180.0);
82	>	v->vn2 = v->vert * (PI/180.0);
83		break;
84		case VT_HEM:                            /* hemispherical fisheye */
85		if (v->horiz > 180.0+FTINY)
#	Line 75 | Line 93 | register VIEW  *v;
93		return("unknown view type");
94		}
95		if (v->type != VT_ANG) {
96	<	v->hvec[0] *= v->hn2;
97	<	v->hvec[1] *= v->hn2;
98	<	v->hvec[2] *= v->hn2;
96	>	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		v->vvec[0] *= v->vn2;
102		v->vvec[1] *= v->vn2;
103		v->vvec[2] *= v->vn2;
#	Line 103 | Line 123 | int  *xp, *yp;                 /* x and y resolution in (or out if *
123		}
124
125
126	+	double
127		viewray(orig, direc, v, x, y)           /* compute ray origin and direction */
128		FVECT  orig, direc;
129		register VIEW  *v;
#	Line 115 | Line 136 | double  x, y;
136
137		switch(v->type) {
138		case VT_PAR:                    /* parallel view */
139	<	orig[0] = v->vp[0] + x*v->hvec[0] + y*v->vvec[0];
140	<	orig[1] = v->vp[1] + x*v->hvec[1] + y*v->vvec[1];
141	<	orig[2] = v->vp[2] + x*v->hvec[2] + y*v->vvec[2];
139	>	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		VCOPY(direc, v->vdir);
146	<	return(0);
146	>	return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
147		case VT_PER:                    /* perspective view */
124	–	VCOPY(orig, v->vp);
148		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	<	normalize(direc);
152	<	return(0);
151	>	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	>	return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0);
156		case VT_HEM:                    /* hemispherical fisheye */
157		z = 1.0 - x*x*v->hn2 - y*y*v->vn2;
158		if (z < 0.0)
159	<	return(-1);
159	>	return(-1.0);
160		z = sqrt(z);
135	–	VCOPY(orig, v->vp);
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	<	return(0);
164	>	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	>	return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
168	>	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		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	<	return(-1);
146	<	VCOPY(orig, v->vp);
147	<	if (d <= FTINY) {
148	<	VCOPY(direc, v->vdir);
149	<	return(0);
150	<	}
185	>	return(-1.0);
186		d = sqrt(d);
187		z = cos(PI*d);
188	<	d = sqrt(1 - z*z)/d;
188	>	d = d <= FTINY ? PI : sqrt(1 - z*z)/d;
189		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	<	return(0);
194	>	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	>	return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0);
198		}
199	<	return(-1);
199	>	return(-1.0);
200		}
201
202
203	<	viewpixel(xp, yp, zp, v, p)             /* find image location for point */
204	<	double  *xp, *yp, *zp;
203	>	viewloc(ip, v, p)               /* find image location for point */
204	>	FVECT  ip;
205		register VIEW  *v;
206		FVECT  p;
207		{
#	Line 176 | Line 214 | FVECT  p;
214
215		switch (v->type) {
216		case VT_PAR:                    /* parallel view */
217	<	if (zp != NULL)
180	<	*zp = DOT(disp,v->vdir);
217	>	ip[2] = DOT(disp,v->vdir) - v->vfore;
218		break;
219		case VT_PER:                    /* perspective view */
220		d = DOT(disp,v->vdir);
221	<	if (zp != NULL) {
222	<	*zp = sqrt(DOT(disp,disp));
223	<	if (d < 0.0)
187	<	*zp = -*zp;
188	<	}
189	<	if (d < 0.0)            /* fold pyramid */
221	>	ip[2] = sqrt(DOT(disp,disp));
222	>	if (d < 0.0) {          /* fold pyramid */
223	>	ip[2] = -ip[2];
224		d = -d;
225	+	}
226		if (d > FTINY) {
227		d = 1.0/d;
228		disp[0] *= d;
229		disp[1] *= d;
230		disp[2] *= d;
231		}
232	+	ip[2] *= (1.0 - v->vfore*d);
233		break;
234		case VT_HEM:                    /* hemispherical fisheye */
235		d = normalize(disp);
236	<	if (zp != NULL) {
237	<	if (DOT(disp,v->vdir) < 0.0)
238	<	*zp = -d;
239	<	else
240	<	*zp = d;
205	<	}
236	>	if (DOT(disp,v->vdir) < 0.0)
237	>	ip[2] = -d;
238	>	else
239	>	ip[2] = d;
240	>	ip[2] -= v->vfore;
241		break;
242	+	case VT_CYL:                    /* cylindrical panorama */
243	+	ip[2] = DOT(disp,v->vdir);
244	+	d = DOT(disp,v->hvec);
245	+	ip[0] = 180.0/PI * atan2(d,ip[2]) / v->horiz + 0.5 - v->hoff;
246	+	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		case VT_ANG:                    /* angular fisheye */
254	<	d = normalize(disp);
255	<	if (zp != NULL)
256	<	*zp = d;
211	<	*xp = 0.5 - v->hoff;
212	<	*yp = 0.5 - v->voff;
254	>	ip[0] = 0.5 - v->hoff;
255	>	ip[1] = 0.5 - v->voff;
256	>	ip[2] = normalize(disp) - v->vfore;
257		d = DOT(disp,v->vdir);
258		if (d >= 1.0-FTINY)
259		return;
260		if (d <= -(1.0-FTINY)) {
261	<	*xp += 180.0/v->horiz;
218	<	*yp += 180.0/v->vert;
261	>	ip[0] += 180.0/v->horiz;
262		return;
263		}
264		d = acos(d)/PI / sqrt(1.0 - d*d);
265	<	*xp += DOT(disp,v->hvec)*d*180.0/v->horiz;
266	<	*yp += DOT(disp,v->vvec)*d*180.0/v->vert;
265	>	ip[0] += DOT(disp,v->hvec)*d*180.0/v->horiz;
266	>	ip[1] += DOT(disp,v->vvec)*d*180.0/v->vert;
267		return;
268		}
269	<	*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff;
270	<	*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff;
269	>	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		}
272
273
274	+	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		int
321		getviewopt(v, ac, av)                   /* process view argument */
322		register VIEW  *v;
323		int  ac;
324		register char  *av[];
325		{
326	<	#define check(c,n)      if ((av[0][c]&&av[0][c]!=' ') || n>=ac) return(-1)
327	<	extern double  atof();
326	>	#define check(c,l)      if ((av[0][c]&&av[0][c]!=' ') || \
327	>	badarg(ac-1,av+1,l)) return(-1)
328
329		if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v')
330		return(-1);
#	Line 243 | Line 332 | register char  *av[];
332		case 't':                       /* type */
333		if (!av[0][3] || av[0][3]==' ')
334		return(-1);
335	<	check(4,0);
335	>	check(4,"");
336		v->type = av[0][3];
337		return(0);
338		case 'p':                       /* point */
339	<	check(3,3);
339	>	check(3,"fff");
340		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	<	check(3,3);
345	>	check(3,"fff");
346		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	<	check(3,3);
351	>	check(3,"fff");
352		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	<	check(3,1);
357	>	check(3,"f");
358		v->horiz = atof(av[1]);
359		return(1);
360		case 'v':                       /* vertical size */
361	<	check(3,1);
361	>	check(3,"f");
362		v->vert = atof(av[1]);
363		return(1);
364	+	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		case 's':                       /* shift */
373	<	check(3,1);
373	>	check(3,"f");
374		v->hoff = atof(av[1]);
375		return(1);
376		case 'l':                       /* lift */
377	<	check(3,1);
377	>	check(3,"f");
378		v->voff = atof(av[1]);
379		return(1);
380		default:
#	Line 297 | Line 394 | register char  *s;
394		int  na;
395		int  nvopts = 0;
396
397	<	while (*s == ' ')
398	<	s++;
397	>	if (*s != '-')
398	>	s = sskip(s);
399		while (*s) {
400		ac = 0;
401		do {
#	Line 328 | Line 425 | FILE  *fp;
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	+	fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft);
429		fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff);
430		}
431
432
433	<	static VIEW  *hview;                    /* view from header */
434	<	static int  gothview;                   /* success indicator */
435	<	static char  *altname[] = {NULL,"rpict","rview","pinterp",VIEWSTR,NULL};
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	+	}
485
486	<	static
487	<	gethview(s)                             /* get view from header */
486	>
487	>	int
488	>	isview(s)                               /* is this a view string? */
489		char  *s;
490		{
491	+	static char  *altname[]={NULL,VIEWSTR,"rpict","rview","pinterp",NULL};
492	+	extern char  *progname;
493	+	register char  *cp;
494		register char  **an;
495	<
495	>	/* add program name to list */
496	>	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	>	/* skip leading path */
504	>	cp = s;
505	>	while (*cp && *cp != ' ')
506	>	cp++;
507	>	while (cp > s && !ISDIRSEP(cp[-1]))
508	>	cp--;
509		for (an = altname; *an != NULL; an++)
510	<	if (!strncmp(*an, s, strlen(*an))) {
511	<	if (sscanview(hview, s+strlen(*an)) > 0)
512	<	gothview++;
350	<	return;
351	<	}
510	>	if (!strncmp(*an, cp, strlen(*an)))
511	>	return(1);
512	>	return(0);
513		}
514
515
516	+	struct myview {
517	+	VIEW    *hv;
518	+	int     ok;
519	+	};
520	+
521	+
522	+	static
523	+	gethview(s, v)                          /* get view from header */
524	+	char  *s;
525	+	register struct myview  *v;
526	+	{
527	+	if (isview(s) && sscanview(v->hv, s) > 0)
528	+	v->ok++;
529	+	}
530	+
531	+
532		int
533	<	viewfile(fname, vp, xp, yp)             /* get view from file */
533	>	viewfile(fname, vp, rp)                 /* get view from file */
534		char  *fname;
535		VIEW  *vp;
536	<	int  *xp, *yp;
536	>	RESOLU  *rp;
537		{
538	<	extern char  *progname;
538	>	struct myview   mvs;
539		FILE  *fp;
540
541		if ((fp = fopen(fname, "r")) == NULL)
542		return(-1);
543
544	<	altname[0] = progname;
545	<	hview = vp;
369	<	gothview = 0;
544	>	mvs.hv = vp;
545	>	mvs.ok = 0;
546
547	<	getheader(fp, gethview);
547	>	getheader(fp, gethview, &mvs);
548
549	<	if (xp != NULL && yp != NULL
550	<	&& fgetresolu(xp, yp, fp) == -1)
375	<	gothview = 0;
549	>	if (rp != NULL && !fgetsresolu(rp, fp))
550	>	mvs.ok = 0;
551
552		fclose(fp);
553
554	<	return(gothview);
554	>	return(mvs.ok);
555		}

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