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root/radiance/ray/src/px/pinterp.c

Comparing ray/src/px/pinterp.c (file contents):
Revision 1.7 by greg, Tue Jan 2 17:22:07 1990 UTC vs.
Revision 2.40 by schorsch, Fri Jan 2 12:47:01 2004 UTC

#	Line 1 | Line 1
1		#ifndef lint
2	<	static char SCCSid[] = "$SunId$ LBL";
2	>	static const char       RCSid[] = "$Id$";
3		#endif
4	–
4		/*
5		* Interpolate and extrapolate pictures with different view parameters.
6		*
7		*      Greg Ward       09Dec89
8		*/
9
10	<	#include "standard.h"
10	>	#include "copyright.h"
11
12	<	#include "view.h"
12	>	#include <ctype.h>
13	>	#include <string.h>
14
15	+	#include "platform.h"
16	+	#include "standard.h"
17	+	#include "rtprocess.h" /* Windows: must come before color.h */
18	+	#include "view.h"
19		#include "color.h"
20
21	<	#define pscan(y)        (ourpict+(y)*ourview.hresolu)
18	<	#define zscan(y)        (ourzbuf+(y)*ourview.hresolu)
21	>	#define LOG2            0.69314718055994530942
22
23	+	#define pscan(y)        (ourpict+(y)*hresolu)
24	+	#define sscan(y)        (ourspict+(y)*hresolu)
25	+	#define wscan(y)        (ourweigh+(y)*hresolu)
26	+	#define zscan(y)        (ourzbuf+(y)*hresolu)
27	+	#define bscan(y)        (ourbpict+(y)*hresolu)
28	+	#define averaging       (ourweigh != NULL)
29	+	#define blurring        (ourbpict != NULL)
30	+	#define usematrix       (hasmatrix & !averaging)
31	+	#define zisnorm         ((!usematrix) | (ourview.type != VT_PER))
32	+
33	+	#define MAXWT           1000.           /* maximum pixel weight (averaging) */
34	+
35	+	#define F_FORE          1               /* fill foreground */
36	+	#define F_BACK          2               /* fill background */
37	+
38	+	#define PACKSIZ         256             /* max. calculation packet size */
39	+
40	+	#define RTCOM           "rtrace -h- -ovl -fff -ld- -i- -I- "
41	+
42		#define ABS(x)          ((x)>0?(x):-(x))
43
44	<	VIEW    ourview = STDVIEW(512);         /* desired view */
44	>	struct position {int x,y; float z;};
45
46	<	double  zeps = 0.001;                   /* allowed z epsilon */
46	>	#define NSTEPS          64              /* number steps in overlap prescan */
47	>	#define MINSTEP         4               /* minimum worthwhile preview step */
48
49	<	COLR    *ourpict;                       /* output picture */
49	>	struct bound {int min,max;};
50	>
51	>	VIEW    ourview = STDVIEW;              /* desired view */
52	>	int     hresolu = 512;                  /* horizontal resolution */
53	>	int     vresolu = 512;                  /* vertical resolution */
54	>	double  pixaspect = 1.0;                /* pixel aspect ratio */
55	>
56	>	double  zeps = .02;                     /* allowed z epsilon */
57	>
58	>	COLR    *ourpict;                       /* output picture (COLR's) */
59	>	COLOR   *ourspict;                      /* output pixel sums (averaging) */
60	>	float   *ourweigh = NULL;               /* output pixel weights (averaging) */
61		float   *ourzbuf;                       /* corresponding z-buffer */
62	+	COLOR   *ourbpict = NULL;               /* blurred picture (view averaging) */
63
64	+	VIEW    avgview;                        /* average view for -B option */
65	+	int     nvavg;                          /* number of views averaged */
66	+
67		char    *progname;
68
69	<	VIEW    theirview = STDVIEW(512);       /* input view */
69	>	int     fillo = F_FORE|F_BACK;          /* selected fill options */
70	>	int     fillsamp = 0;                   /* sample separation (0 == inf) */
71	>	extern int      backfill(), rcalfill(); /* fill functions */
72	>	int     (*fillfunc)() = backfill;       /* selected fill function */
73	>	COLR    backcolr = BLKCOLR;             /* background color */
74	>	COLOR   backcolor = BLKCOLOR;           /* background color (float) */
75	>	double  backz = 0.0;                    /* background z value */
76	>	int     normdist = 1;                   /* i/o normalized distance? */
77	>	char    ourfmt[LPICFMT+1] = PICFMT;     /* original picture format */
78	>	double  ourexp = -1;                    /* original picture exposure */
79	>	int     expadj = 0;                     /* exposure adjustment (f-stops) */
80	>	double  rexpadj = 1;                    /* real exposure adjustment */
81	>
82	>	VIEW    theirview;                      /* input view */
83		int     gotview;                        /* got input view? */
84	+	int     wrongformat = 0;                /* input in another format? */
85	+	RESOLU  tresolu;                        /* input resolution */
86	+	double  theirexp;                       /* input picture exposure */
87	+	MAT4    theirs2ours;                    /* transformation matrix */
88	+	int     hasmatrix = 0;                  /* has transformation matrix */
89
90	<	double  theirs2ours[4][4];              /* transformation matrix */
90	>	static SUBPROC PDesc = SP_INACTIVE; /* rtrace process descriptor */
91	>	unsigned short  queue[PACKSIZ][2];      /* pending pixels */
92	>	int     packsiz;                        /* actual packet size */
93	>	int     queuesiz = 0;                   /* number of pixels pending */
94
95	+	extern double   movepixel();
96
97	+	static gethfunc headline;
98	+
99	+
100		main(argc, argv)                        /* interpolate pictures */
101		int     argc;
102		char    *argv[];
103		{
104	<	#define check(olen,narg)        if (argv[i][olen] || narg >= argc-i) goto badopt
104	>	#define  check(ol,al)           if (argv[an][ol] || \
105	>	badarg(argc-an-1,argv+an+1,al)) \
106	>	goto badopt
107		int     gotvfile = 0;
108	<	char    *err;
109	<	int     i;
108	>	int     doavg = -1;
109	>	int     doblur = 0;
110	>	char    *zfile = NULL;
111	>	char    *expcomp = NULL;
112	>	int     i, an, rval;
113
114		progname = argv[0];
115
116	<	for (i = 1; i < argc && argv[i][0] == '-'; i++)
117	<	switch (argv[i][1]) {
116	>	for (an = 1; an < argc && argv[an][0] == '-'; an++) {
117	>	rval = getviewopt(&ourview, argc-an, argv+an);
118	>	if (rval >= 0) {
119	>	an += rval;
120	>	continue;
121	>	}
122	>	switch (argv[an][1]) {
123	>	case 'e':                               /* exposure */
124	>	check(2,"f");
125	>	expcomp = argv[++an];
126	>	break;
127		case 't':                               /* threshold */
128	<	check(2,1);
129	<	zeps = atof(argv[++i]);
128	>	check(2,"f");
129	>	zeps = atof(argv[++an]);
130		break;
131	<	case 'x':                               /* x resolution */
132	<	check(2,1);
133	<	ourview.hresolu = atoi(argv[++i]);
131	>	case 'a':                               /* average */
132	>	check(2,NULL);
133	>	doavg = 1;
134		break;
135	<	case 'y':                               /* y resolution */
136	<	check(2,1);
137	<	ourview.vresolu = atoi(argv[++i]);
135	>	case 'B':                               /* blur views */
136	>	check(2,NULL);
137	>	doblur = 1;
138		break;
139	<	case 'v':                               /* view */
140	<	switch (argv[i][2]) {
141	<	case 't':                               /* type */
142	<	check(4,0);
143	<	ourview.type = argv[i][3];
139	>	case 'q':                               /* quick (no avg.) */
140	>	check(2,NULL);
141	>	doavg = 0;
142	>	break;
143	>	case 'n':                               /* dist. normalized? */
144	>	check(2,NULL);
145	>	normdist = !normdist;
146	>	break;
147	>	case 'f':                               /* fill type */
148	>	switch (argv[an][2]) {
149	>	case '0':                               /* none */
150	>	check(3,NULL);
151	>	fillo = 0;
152		break;
153	<	case 'p':                               /* point */
154	<	check(3,3);
155	<	ourview.vp[0] = atof(argv[++i]);
71	<	ourview.vp[1] = atof(argv[++i]);
72	<	ourview.vp[2] = atof(argv[++i]);
153	>	case 'f':                               /* foreground */
154	>	check(3,NULL);
155	>	fillo = F_FORE;
156		break;
157	<	case 'd':                               /* direction */
158	<	check(3,3);
159	<	ourview.vdir[0] = atof(argv[++i]);
77	<	ourview.vdir[1] = atof(argv[++i]);
78	<	ourview.vdir[2] = atof(argv[++i]);
157	>	case 'b':                               /* background */
158	>	check(3,NULL);
159	>	fillo = F_BACK;
160		break;
161	<	case 'u':                               /* up */
162	<	check(3,3);
163	<	ourview.vup[0] = atof(argv[++i]);
83	<	ourview.vup[1] = atof(argv[++i]);
84	<	ourview.vup[2] = atof(argv[++i]);
161	>	case 'a':                               /* all */
162	>	check(3,NULL);
163	>	fillo = F_FORE|F_BACK;
164		break;
165	<	case 'h':                               /* horizontal */
166	<	check(3,1);
167	<	ourview.horiz = atof(argv[++i]);
165	>	case 's':                               /* sample */
166	>	check(3,"i");
167	>	fillsamp = atoi(argv[++an]);
168		break;
169	<	case 'v':                               /* vertical */
170	<	check(3,1);
171	<	ourview.vert = atof(argv[++i]);
169	>	case 'c':                               /* color */
170	>	check(3,"fff");
171	>	fillfunc = backfill;
172	>	setcolor(backcolor, atof(argv[an+1]),
173	>	atof(argv[an+2]), atof(argv[an+3]));
174	>	setcolr(backcolr, colval(backcolor,RED),
175	>	colval(backcolor,GRN),
176	>	colval(backcolor,BLU));
177	>	an += 3;
178		break;
179	<	case 'f':                               /* file */
180	<	check(3,1);
181	<	gotvfile = viewfile(argv[++i], &ourview);
182	<	if (gotvfile < 0) {
98	<	perror(argv[i]);
99	<	exit(1);
100	<	} else if (gotvfile == 0) {
101	<	fprintf(stderr, "%s: bad view file\n",
102	<	argv[i]);
103	<	exit(1);
104	<	}
179	>	case 'z':                               /* z value */
180	>	check(3,"f");
181	>	fillfunc = backfill;
182	>	backz = atof(argv[++an]);
183		break;
184	+	case 'r':                               /* rtrace */
185	+	check(3,"s");
186	+	fillfunc = rcalfill;
187	+	calstart(RTCOM, argv[++an]);
188	+	break;
189		default:
190		goto badopt;
191		}
192		break;
193	+	case 'z':                               /* z file */
194	+	check(2,"s");
195	+	zfile = argv[++an];
196	+	break;
197	+	case 'x':                               /* x resolution */
198	+	check(2,"i");
199	+	hresolu = atoi(argv[++an]);
200	+	break;
201	+	case 'y':                               /* y resolution */
202	+	check(2,"i");
203	+	vresolu = atoi(argv[++an]);
204	+	break;
205	+	case 'p':                               /* pixel aspect */
206	+	if (argv[an][2] != 'a')
207	+	goto badopt;
208	+	check(3,"f");
209	+	pixaspect = atof(argv[++an]);
210	+	break;
211	+	case 'v':                               /* view file */
212	+	if (argv[an][2] != 'f')
213	+	goto badopt;
214	+	check(3,"s");
215	+	gotvfile = viewfile(argv[++an], &ourview, NULL);
216	+	if (gotvfile < 0)
217	+	syserror(argv[an]);
218	+	else if (gotvfile == 0) {
219	+	fprintf(stderr, "%s: bad view file\n",
220	+	argv[an]);
221	+	exit(1);
222	+	}
223	+	break;
224		default:
225		badopt:
226	<	fprintf(stderr, "%s: unknown option '%s'\n",
227	<	progname, argv[i]);
228	<	exit(1);
226	>	fprintf(stderr, "%s: command line error at '%s'\n",
227	>	progname, argv[an]);
228	>	goto userr;
229		}
230	+	}
231		/* check arguments */
232	<	if (argc-i < 2 || (argc-i)%2) {
233	<	fprintf(stderr, "Usage: %s [view args] pfile zfile ..\n",
234	<	progname);
235	<	exit(1);
232	>	if ((argc-an)%2)
233	>	goto userr;
234	>	if (fillsamp == 1)
235	>	fillo &= ~F_BACK;
236	>	if (doavg < 0)
237	>	doavg = (argc-an) > 2;
238	>	if (expcomp != NULL) {
239	>	if ((expcomp[0] == '+') | (expcomp[0] == '-')) {
240	>	expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
241	>	if (doavg | doblur)
242	>	rexpadj = pow(2.0, atof(expcomp));
243	>	else
244	>	rexpadj = pow(2.0, (double)expadj);
245	>	} else {
246	>	if (!isflt(expcomp))
247	>	goto userr;
248	>	rexpadj = atof(expcomp);
249	>	expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
250	>	if (!(doavg | doblur))
251	>	rexpadj = pow(2.0, (double)expadj);
252	>	}
253		}
254		/* set view */
255	<	if (err = setview(&ourview)) {
256	<	fprintf(stderr, "%s: %s\n", progname, err);
255	>	if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
256	>	fprintf(stderr, "%s: no view on standard input!\n",
257	>	progname);
258		exit(1);
259		}
260	+	normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
261		/* allocate frame */
262	<	ourpict = (COLR *)calloc(ourview.hresolu*ourview.vresolu,sizeof(COLR));
263	<	ourzbuf = (float *)calloc(ourview.hresolu*ourview.vresolu,sizeof(float));
264	<	if (ourpict == NULL || ourzbuf == NULL) {
265	<	perror(progname);
266	<	exit(1);
262	>	if (doavg) {
263	>	ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
264	>	ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
265	>	if ((ourspict == NULL) | (ourweigh == NULL))
266	>	syserror(progname);
267	>	} else {
268	>	ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
269	>	if (ourpict == NULL)
270	>	syserror(progname);
271		}
272	<	/* get input */
273	<	for ( ; i < argc; i += 2)
274	<	addpicture(argv[i], argv[i+1]);
275	<	/* fill in spaces */
276	<	fillpicture();
272	>	if (doblur) {
273	>	ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
274	>	if (ourbpict == NULL)
275	>	syserror(progname);
276	>	}
277	>	ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
278	>	if (ourzbuf == NULL)
279	>	syserror(progname);
280	>	/* new header */
281	>	newheader("RADIANCE", stdout);
282	>	fputnow(stdout);
283	>	/* run pictures */
284	>	do {
285	>	memset((char *)ourzbuf, '\0', hresolu*vresolu*sizeof(float));
286	>	for (i = an; i < argc; i += 2)
287	>	addpicture(argv[i], argv[i+1]);
288	>	if (fillo&F_BACK)                       /* fill in spaces */
289	>	backpicture(fillfunc, fillsamp);
290	>	else
291	>	fillpicture(fillfunc);
292	>	/* aft clipping */
293	>	clipaft();
294	>	} while (addblur() && nextview(stdin) != EOF);
295	>	/* close calculation */
296	>	caldone();
297		/* add to header */
298		printargs(argc, argv, stdout);
299	<	if (gotvfile) {
300	<	printf(VIEWSTR);
301	<	fprintview(&ourview, stdout);
302	<	printf("\n");
299	>	compavgview();
300	>	if (doblur | gotvfile) {
301	>	fputs(VIEWSTR, stdout);
302	>	fprintview(&avgview, stdout);
303	>	putc('\n', stdout);
304		}
305	<	printf("\n");
306	<	/* write output */
305	>	if ((pixaspect < .99) | (pixaspect > 1.01))
306	>	fputaspect(pixaspect, stdout);
307	>	if (ourexp > 0)
308	>	ourexp *= rexpadj;
309	>	else
310	>	ourexp = rexpadj;
311	>	if ((ourexp < .995) | (ourexp > 1.005))
312	>	fputexpos(ourexp, stdout);
313	>	if (strcmp(ourfmt, PICFMT))             /* print format if known */
314	>	fputformat(ourfmt, stdout);
315	>	putc('\n', stdout);
316	>	/* write picture */
317		writepicture();
318	+	/* write z file */
319	+	if (zfile != NULL)
320	+	writedistance(zfile);
321
322		exit(0);
323	+	userr:
324	+	fprintf(stderr,
325	+	"Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
326	+	progname);
327	+	exit(1);
328		#undef check
329		}
330
331
332	<	headline(s)                             /* process header string */
333	<	char    *s;
332	>	static int
333	>	headline(                               /* process header string */
334	>	char    *s,
335	>	void    *p
336	>	)
337		{
338	<	static char     *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL};
159	<	register char   **an;
338	>	char    fmt[32];
339
340	<	printf("\t%s", s);
341	<
342	<	for (an = altname; *an != NULL; an++)
343	<	if (!strncmp(*an, s, strlen(*an))) {
344	<	if (sscanview(&theirview, s+strlen(*an)) == 0)
345	<	gotview++;
346	<	break;
347	<	}
340	>	if (isheadid(s))
341	>	return(0);
342	>	if (formatval(fmt, s)) {
343	>	if (globmatch(ourfmt, fmt)) {
344	>	wrongformat = 0;
345	>	strcpy(ourfmt, fmt);
346	>	} else
347	>	wrongformat = 1;
348	>	return(0);
349	>	}
350	>	if (nvavg < 2) {
351	>	putc('\t', stdout);
352	>	fputs(s, stdout);
353	>	}
354	>	if (isexpos(s)) {
355	>	theirexp *= exposval(s);
356	>	return(0);
357	>	}
358	>	if (isview(s) && sscanview(&theirview, s) > 0)
359	>	gotview++;
360	>	return(0);
361		}
362
363
364	<	addpicture(pfile, zfile)                /* add picture to output */
365	<	char    *pfile, *zfile;
364	>	nextview(fp)                            /* get and set next view */
365	>	FILE    *fp;
366		{
367	<	FILE    *pfp, *zfp;
176	<	COLR    *scanin;
177	<	float   *zin;
367	>	char    linebuf[256];
368		char    *err;
369	<	int     xres, yres;
370	<	int     y;
371	<	/* open input files */
372	<	if ((pfp = fopen(pfile, "r")) == NULL) {
373	<	perror(pfile);
374	<	exit(1);
369	>	register int    i;
370	>
371	>	if (fp != NULL) {
372	>	do                      /* get new view */
373	>	if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
374	>	return(EOF);
375	>	while (!isview(linebuf) || !sscanview(&ourview, linebuf));
376		}
377	<	if ((zfp = fopen(zfile, "r")) == NULL) {
378	<	perror(zfile);
377	>	/* set new view */
378	>	if ((err = setview(&ourview)) != NULL) {
379	>	fprintf(stderr, "%s: %s\n", progname, err);
380		exit(1);
381		}
382	<	/* get header and view */
383	<	printf("%s:\n", pfile);
382	>	if (!nvavg) {                   /* first view */
383	>	avgview = ourview;
384	>	return(nvavg++);
385	>	}
386	>	/* add to average view */
387	>	for (i = 0; i < 3; i++) {
388	>	avgview.vp[i] += ourview.vp[i];
389	>	avgview.vdir[i] += ourview.vdir[i];
390	>	avgview.vup[i] += ourview.vup[i];
391	>	}
392	>	avgview.horiz += ourview.horiz;
393	>	avgview.vert += ourview.vert;
394	>	avgview.hoff += ourview.hoff;
395	>	avgview.voff += ourview.voff;
396	>	avgview.vfore += ourview.vfore;
397	>	avgview.vaft += ourview.vaft;
398	>	return(nvavg++);
399	>	}
400	>
401	>
402	>	compavgview()                           /* compute average view */
403	>	{
404	>	register int    i;
405	>	double  f;
406	>
407	>	if (nvavg < 2)
408	>	return;
409	>	f = 1.0/nvavg;
410	>	for (i = 0; i < 3; i++) {
411	>	avgview.vp[i] *= f;
412	>	avgview.vdir[i] *= f;
413	>	avgview.vup[i] *= f;
414	>	}
415	>	avgview.horiz *= f;
416	>	avgview.vert *= f;
417	>	avgview.hoff *= f;
418	>	avgview.voff *= f;
419	>	avgview.vfore *= f;
420	>	avgview.vaft *= f;
421	>	if (setview(&avgview) != NULL)          /* in case of emergency... */
422	>	avgview = ourview;
423	>	pixaspect = viewaspect(&avgview) * hresolu / vresolu;
424	>	}
425	>
426	>
427	>	addpicture(pfile, zspec)                /* add picture to output */
428	>	char    *pfile, *zspec;
429	>	{
430	>	FILE    *pfp;
431	>	int     zfd;
432	>	char    *err;
433	>	COLR    *scanin;
434	>	float   *zin;
435	>	struct position *plast;
436	>	struct bound    *xlim, ylim;
437	>	int     y;
438	>	/* open picture file */
439	>	if ((pfp = fopen(pfile, "r")) == NULL)
440	>	syserror(pfile);
441	>	/* get header with exposure and view */
442	>	theirexp = 1.0;
443	>	theirview = stdview;
444		gotview = 0;
445	<	getheader(pfp, headline);
446	<	if (!gotview || fgetresolu(&xres, &yres, pfp) != (YMAJOR|YDECR)) {
447	<	fprintf(stderr, "%s: picture view error\n", pfile);
445	>	if (nvavg < 2)
446	>	printf("%s:\n", pfile);
447	>	getheader(pfp, headline, NULL);
448	>	if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
449	>	fprintf(stderr, "%s: picture format error\n", pfile);
450		exit(1);
451		}
452	<	theirview.hresolu = xres;
453	<	theirview.vresolu = yres;
454	<	if (err = setview(&theirview)) {
452	>	if (ourexp <= 0)
453	>	ourexp = theirexp;
454	>	else if (ABS(theirexp-ourexp) > .01*ourexp)
455	>	fprintf(stderr, "%s: different exposure (warning)\n", pfile);
456	>	if ( (err = setview(&theirview)) ) {
457		fprintf(stderr, "%s: %s\n", pfile, err);
458		exit(1);
459		}
460		/* compute transformation */
461	<	pixform(theirs2ours, &theirview, &ourview);
462	<	/* allocate scanlines */
463	<	scanin = (COLR *)malloc(xres*sizeof(COLR));
464	<	zin = (float *)malloc(xres*sizeof(float));
465	<	if (scanin == NULL || zin == NULL) {
466	<	perror(progname);
467	<	exit(1);
461	>	hasmatrix = pixform(theirs2ours, &theirview, &ourview);
462	>	/* get z specification or file */
463	>	zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
464	>	if (zin == NULL)
465	>	syserror(progname);
466	>	if ((zfd = open(zspec, O_RDONLY)) == -1) {
467	>	double  zvalue;
468	>	register int    x;
469	>	if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
470	>	syserror(zspec);
471	>	for (x = scanlen(&tresolu); x-- > 0; )
472	>	zin[x] = zvalue;
473		}
474	<	/* load image */
475	<	for (y = yres-1; y >= 0; y--) {
476	<	if (freadcolrs(scanin, xres, pfp) < 0) {
474	>	/* compute transferrable perimeter */
475	>	xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
476	>	if (xlim == NULL)
477	>	syserror(progname);
478	>	if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
479	>	free((void *)zin);
480	>	free((void *)xlim);
481	>	if (zfd != -1)
482	>	close(zfd);
483	>	fclose(pfp);
484	>	return;
485	>	}
486	>	/* allocate scanlines */
487	>	scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
488	>	plast = (struct position *)calloc(scanlen(&tresolu),
489	>	sizeof(struct position));
490	>	if ((scanin == NULL) | (plast == NULL))
491	>	syserror(progname);
492	>	/* skip to starting point */
493	>	for (y = 0; y < ylim.min; y++)
494	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
495		fprintf(stderr, "%s: read error\n", pfile);
496		exit(1);
497		}
498	<	if (fread(zin, sizeof(float), xres, zfp) < xres) {
499	<	fprintf(stderr, "%s: read error\n", zfile);
498	>	if (zfd != -1 && lseek(zfd,
499	>	(off_t)ylim.min*scanlen(&tresolu)*sizeof(float),
500	>	SEEK_SET) < 0)
501	>	syserror(zspec);
502	>	/* load image */
503	>	for (y = ylim.min; y <= ylim.max; y++) {
504	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
505	>	fprintf(stderr, "%s: read error\n", pfile);
506		exit(1);
507		}
508	<	addscanline(y, scanin, zin);
508	>	if (zfd != -1 && read(zfd, (char *)zin,
509	>	scanlen(&tresolu)*sizeof(float))
510	>	< scanlen(&tresolu)*sizeof(float))
511	>	syserror(zspec);
512	>	addscanline(xlim+y, y, scanin, zin, plast);
513		}
514		/* clean up */
515	<	free((char *)scanin);
516	<	free((char *)zin);
515	>	free((void *)xlim);
516	>	free((void *)scanin);
517	>	free((void *)zin);
518	>	free((void *)plast);
519		fclose(pfp);
520	<	fclose(zfp);
520	>	if (zfd != -1)
521	>	close(zfd);
522		}
523
524
525		pixform(xfmat, vw1, vw2)                /* compute view1 to view2 matrix */
526	<	register double xfmat[4][4];
526	>	register MAT4   xfmat;
527		register VIEW   *vw1, *vw2;
528		{
529		double  m4t[4][4];
530
531	+	if ((vw1->type != VT_PER) & (vw1->type != VT_PAR))
532	+	return(0);
533	+	if ((vw2->type != VT_PER) & (vw2->type != VT_PAR))
534	+	return(0);
535		setident4(xfmat);
536	<	xfmat[0][0] = vw1->vhinc[0];
537	<	xfmat[0][1] = vw1->vhinc[1];
538	<	xfmat[0][2] = vw1->vhinc[2];
539	<	xfmat[1][0] = vw1->vvinc[0];
540	<	xfmat[1][1] = vw1->vvinc[1];
541	<	xfmat[1][2] = vw1->vvinc[2];
536	>	xfmat[0][0] = vw1->hvec[0];
537	>	xfmat[0][1] = vw1->hvec[1];
538	>	xfmat[0][2] = vw1->hvec[2];
539	>	xfmat[1][0] = vw1->vvec[0];
540	>	xfmat[1][1] = vw1->vvec[1];
541	>	xfmat[1][2] = vw1->vvec[2];
542		xfmat[2][0] = vw1->vdir[0];
543		xfmat[2][1] = vw1->vdir[1];
544		xfmat[2][2] = vw1->vdir[2];
#	Line 250 | Line 546 | register VIEW  *vw1, *vw2;
546		xfmat[3][1] = vw1->vp[1];
547		xfmat[3][2] = vw1->vp[2];
548		setident4(m4t);
549	<	m4t[0][0] = vw2->vhinc[0]/vw2->vhn2;
550	<	m4t[1][0] = vw2->vhinc[1]/vw2->vhn2;
551	<	m4t[2][0] = vw2->vhinc[2]/vw2->vhn2;
552	<	m4t[3][0] = -DOT(vw2->vp,vw2->vhinc)/vw2->vhn2;
553	<	m4t[0][1] = vw2->vvinc[0]/vw2->vvn2;
554	<	m4t[1][1] = vw2->vvinc[1]/vw2->vvn2;
555	<	m4t[2][1] = vw2->vvinc[2]/vw2->vvn2;
556	<	m4t[3][1] = -DOT(vw2->vp,vw2->vvinc)/vw2->vvn2;
549	>	m4t[0][0] = vw2->hvec[0]/vw2->hn2;
550	>	m4t[1][0] = vw2->hvec[1]/vw2->hn2;
551	>	m4t[2][0] = vw2->hvec[2]/vw2->hn2;
552	>	m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
553	>	m4t[0][1] = vw2->vvec[0]/vw2->vn2;
554	>	m4t[1][1] = vw2->vvec[1]/vw2->vn2;
555	>	m4t[2][1] = vw2->vvec[2]/vw2->vn2;
556	>	m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
557		m4t[0][2] = vw2->vdir[0];
558		m4t[1][2] = vw2->vdir[1];
559		m4t[2][2] = vw2->vdir[2];
560		m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
561		multmat4(xfmat, xfmat, m4t);
562	+	return(1);
563		}
564
565
566	<	addscanline(y, pline, zline)            /* add scanline to output */
566	>	addscanline(xl, y, pline, zline, lasty) /* add scanline to output */
567	>	struct bound    *xl;
568		int     y;
569		COLR    *pline;
570		float   *zline;
571	+	struct position *lasty;         /* input/output */
572		{
573	<	extern double   sqrt();
574	<	double  pos[3];
573	>	FVECT   pos;
574	>	struct position lastx, newpos;
575	>	double  wt;
576		register int    x;
277	–	register int    xpos, ypos;
577
578	<	for (x = 0; x < theirview.hresolu; x++) {
579	<	pos[0] = x - .5*(theirview.hresolu-1);
580	<	pos[1] = y - .5*(theirview.vresolu-1);
578	>	lastx.z = 0;
579	>	for (x = xl->max; x >= xl->min; x--) {
580	>	pix2loc(pos, &tresolu, x, y);
581		pos[2] = zline[x];
582	+	if ((wt = movepixel(pos)) <= FTINY) {
583	+	lasty[x].z = lastx.z = 0;       /* mark invalid */
584	+	continue;
585	+	}
586	+	/* add pixel to our image */
587	+	newpos.x = pos[0] * hresolu;
588	+	newpos.y = pos[1] * vresolu;
589	+	newpos.z = zline[x];
590	+	addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
591	+	lasty[x].x = lastx.x = newpos.x;
592	+	lasty[x].y = lastx.y = newpos.y;
593	+	lasty[x].z = lastx.z = newpos.z;
594	+	}
595	+	}
596	+
597	+
598	+	addpixel(p0, p1, p2, pix, w, z)         /* fill in pixel parallelogram */
599	+	struct position *p0, *p1, *p2;
600	+	COLR    pix;
601	+	double  w;
602	+	double  z;
603	+	{
604	+	double  zt = 2.*zeps*p0->z;             /* threshold */
605	+	COLOR   pval;                           /* converted+weighted pixel */
606	+	int     s1x, s1y, s2x, s2y;             /* step sizes */
607	+	int     l1, l2, c1, c2;                 /* side lengths and counters */
608	+	int     p1isy;                          /* p0p1 along y? */
609	+	int     x1, y1;                         /* p1 position */
610	+	register int    x, y;                   /* final position */
611	+
612	+	/* compute vector p0p1 */
613	+	if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
614	+	s1x = p1->x - p0->x;
615	+	s1y = p1->y - p0->y;
616	+	l1 = ABS(s1x);
617	+	if ( (p1isy = (ABS(s1y) > l1)) )
618	+	l1 = ABS(s1y);
619	+	else if (l1 < 1)
620	+	l1 = 1;
621	+	} else {
622	+	l1 = s1x = s1y = 1;
623	+	p1isy = -1;
624	+	}
625	+	/* compute vector p0p2 */
626	+	if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
627	+	s2x = p2->x - p0->x;
628	+	s2y = p2->y - p0->y;
629	+	if (p1isy == 1)
630	+	l2 = ABS(s2x);
631	+	else {
632	+	l2 = ABS(s2y);
633	+	if (p1isy != 0 && ABS(s2x) > l2)
634	+	l2 = ABS(s2x);
635	+	}
636	+	if (l2 < 1)
637	+	l2 = 1;
638	+	} else
639	+	l2 = s2x = s2y = 1;
640	+	/* fill the parallelogram */
641	+	if (averaging) {
642	+	colr_color(pval, pix);
643	+	scalecolor(pval, w);
644	+	}
645	+	for (c1 = l1; c1-- > 0; ) {
646	+	x1 = p0->x + c1*s1x/l1;
647	+	y1 = p0->y + c1*s1y/l1;
648	+	for (c2 = l2; c2-- > 0; ) {
649	+	x = x1 + c2*s2x/l2;
650	+	if ((x < 0) | (x >= hresolu))
651	+	continue;
652	+	y = y1 + c2*s2y/l2;
653	+	if ((y < 0) | (y >= vresolu))
654	+	continue;
655	+	if (averaging) {
656	+	if (zscan(y)[x] <= 0 || zscan(y)[x]-z
657	+	> zeps*zscan(y)[x]) {
658	+	copycolor(sscan(y)[x], pval);
659	+	wscan(y)[x] = w;
660	+	zscan(y)[x] = z;
661	+	} else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
662	+	addcolor(sscan(y)[x], pval);
663	+	wscan(y)[x] += w;
664	+	}
665	+	} else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
666	+	> zeps*zscan(y)[x]) {
667	+	copycolr(pscan(y)[x], pix);
668	+	zscan(y)[x] = z;
669	+	}
670	+	}
671	+	}
672	+	}
673	+
674	+
675	+	double
676	+	movepixel(pos)                          /* reposition image point */
677	+	register FVECT  pos;
678	+	{
679	+	FVECT   pt, tdir, odir;
680	+	double  d;
681	+
682	+	if (pos[2] <= 0)                /* empty pixel */
683	+	return(0);
684	+	if (usematrix) {
685	+	pos[0] += theirview.hoff - .5;
686	+	pos[1] += theirview.voff - .5;
687	+	if (normdist & (theirview.type == VT_PER))
688	+	d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
689	+	+ pos[1]*pos[1]*theirview.vn2);
690	+	else
691	+	d = 1.;
692	+	pos[2] += d*theirview.vfore;
693		if (theirview.type == VT_PER) {
694	<	pos[2] /= sqrt( 1.
285	<	+ pos[0]*pos[0]*theirview.vhn2
286	<	+ pos[1]*pos[1]*theirview.vvn2 );
694	>	pos[2] /= d;
695		pos[0] *= pos[2];
696		pos[1] *= pos[2];
697		}
698		multp3(pos, pos, theirs2ours);
699	<	if (pos[2] <= 0.0)
700	<	continue;
699	>	if (pos[2] <= ourview.vfore)
700	>	return(0);
701		if (ourview.type == VT_PER) {
702		pos[0] /= pos[2];
703		pos[1] /= pos[2];
704		}
705	<	pos[0] += .5*ourview.hresolu;
706	<	pos[1] += .5*ourview.vresolu;
707	<	if (pos[0] < 0 || pos[0] >= ourview.hresolu
708	<	|| pos[1] < 0 || pos[1] >= ourview.vresolu)
709	<	continue;
710	<	/* check current value at pos */
711	<	xpos = pos[0];
712	<	ypos = pos[1];
713	<	if (zscan(ypos)[xpos] <= 0.0
714	<	|| zscan(ypos)[xpos] - pos[2]
715	<	> zeps*zscan(ypos)[xpos]) {
716	<	zscan(ypos)[xpos] = pos[2];
717	<	copycolr(pscan(ypos)[xpos], pline[x]);
705	>	pos[0] += .5 - ourview.hoff;
706	>	pos[1] += .5 - ourview.voff;
707	>	pos[2] -= ourview.vfore;
708	>	} else {
709	>	if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
710	>	return(0);
711	>	if ((!normdist) & (theirview.type == VT_PER))   /* adjust */
712	>	pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
713	>	+ pos[1]*pos[1]*theirview.vn2);
714	>	pt[0] += tdir[0]*pos[2];
715	>	pt[1] += tdir[1]*pos[2];
716	>	pt[2] += tdir[2]*pos[2];
717	>	viewloc(pos, &ourview, pt);
718	>	if (pos[2] <= 0)
719	>	return(0);
720	>	}
721	>	if ((pos[0] < 0) | (pos[0] >= 1-FTINY) | (pos[1] < 0) | (pos[1] >= 1-FTINY))
722	>	return(0);
723	>	if (!averaging)
724	>	return(1);
725	>	/* compute pixel weight */
726	>	if (ourview.type == VT_PAR) {
727	>	d = DOT(ourview.vdir,tdir);
728	>	d = 1. - d*d;
729	>	} else {
730	>	VSUB(odir, pt, ourview.vp);
731	>	d = DOT(odir,tdir);
732	>	d = 1. - d*d/DOT(odir,odir);
733	>	}
734	>	if (d <= 1./MAXWT/MAXWT)
735	>	return(MAXWT);          /* clip to maximum weight */
736	>	return(1./sqrt(d));
737	>	}
738	>
739	>
740	>	getperim(xl, yl, zline, zfd)            /* compute overlapping image area */
741	>	register struct bound   *xl;
742	>	struct bound    *yl;
743	>	float   *zline;
744	>	int     zfd;
745	>	{
746	>	int     step;
747	>	FVECT   pos;
748	>	register int    x, y;
749	>	/* set up step size */
750	>	if (scanlen(&tresolu) < numscans(&tresolu))
751	>	step = scanlen(&tresolu)/NSTEPS;
752	>	else
753	>	step = numscans(&tresolu)/NSTEPS;
754	>	if (step < MINSTEP) {                   /* not worth cropping? */
755	>	yl->min = 0;
756	>	yl->max = numscans(&tresolu) - 1;
757	>	x = scanlen(&tresolu) - 1;
758	>	for (y = numscans(&tresolu); y--; ) {
759	>	xl[y].min = 0;
760	>	xl[y].max = x;
761		}
762	+	return(1);
763		}
764	+	yl->min = 32000; yl->max = 0;           /* search for points on image */
765	+	for (y = step - 1; y < numscans(&tresolu); y += step) {
766	+	if (zfd != -1) {
767	+	if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
768	+	SEEK_SET) < 0)
769	+	syserror("lseek");
770	+	if (read(zfd, (char *)zline,
771	+	scanlen(&tresolu)*sizeof(float))
772	+	< scanlen(&tresolu)*sizeof(float))
773	+	syserror("read");
774	+	}
775	+	xl[y].min = 32000; xl[y].max = 0;               /* x max */
776	+	for (x = scanlen(&tresolu); (x -= step) > 0; ) {
777	+	pix2loc(pos, &tresolu, x, y);
778	+	pos[2] = zline[x];
779	+	if (movepixel(pos) > FTINY) {
780	+	xl[y].max = x + step - 1;
781	+	xl[y].min = x - step + 1;       /* x min */
782	+	if (xl[y].min < 0)
783	+	xl[y].min = 0;
784	+	for (x = step - 1; x < xl[y].max; x += step) {
785	+	pix2loc(pos, &tresolu, x, y);
786	+	pos[2] = zline[x];
787	+	if (movepixel(pos) > FTINY) {
788	+	xl[y].min = x - step + 1;
789	+	break;
790	+	}
791	+	}
792	+	if (y < yl->min)                /* y limits */
793	+	yl->min = y - step + 1;
794	+	yl->max = y + step - 1;
795	+	break;
796	+	}
797	+	}
798	+	/* fill in between */
799	+	if (y < step) {
800	+	xl[y-1].min = xl[y].min;
801	+	xl[y-1].max = xl[y].max;
802	+	} else {
803	+	if (xl[y].min < xl[y-step].min)
804	+	xl[y-1].min = xl[y].min;
805	+	else
806	+	xl[y-1].min = xl[y-step].min;
807	+	if (xl[y].max > xl[y-step].max)
808	+	xl[y-1].max = xl[y].max;
809	+	else
810	+	xl[y-1].max = xl[y-step].max;
811	+	}
812	+	for (x = 2; x < step; x++)
813	+	*(xl+y-x) = *(xl+y-1);
814	+	}
815	+	if (yl->max >= numscans(&tresolu))
816	+	yl->max = numscans(&tresolu) - 1;
817	+	y -= step;
818	+	for (x = numscans(&tresolu) - 1; x > y; x--)    /* fill bottom rows */
819	+	*(xl+x) = *(xl+y);
820	+	return(yl->max >= yl->min);
821		}
822
823
824	<	fillpicture()                           /* fill in empty spaces */
824	>	backpicture(fill, samp)                 /* background fill algorithm */
825	>	int     (*fill)();
826	>	int     samp;
827		{
828		int     *yback, xback;
829		int     y;
319	–	COLR    pfill;
830		register int    x, i;
831		/* get back buffer */
832	<	yback = (int *)malloc(ourview.hresolu*sizeof(int));
833	<	if (yback == NULL) {
834	<	perror(progname);
835	<	return;
326	<	}
327	<	for (x = 0; x < ourview.hresolu; x++)
832	>	yback = (int *)malloc(hresolu*sizeof(int));
833	>	if (yback == NULL)
834	>	syserror(progname);
835	>	for (x = 0; x < hresolu; x++)
836		yback[x] = -2;
837		/*
838		* Xback and yback are the pixel locations of suitable
#	Line 333 | Line 841 | fillpicture()                          /* fill in empty spaces */
841		* that there is no suitable background in this direction.
842		*/
843		/* fill image */
844	<	for (y = 0; y < ourview.vresolu; y++) {
844	>	for (y = 0; y < vresolu; y++) {
845		xback = -2;
846	<	for (x = 0; x < ourview.hresolu; x++)
847	<	if (zscan(y)[x] <= 0.0) {       /* empty pixel */
846	>	for (x = 0; x < hresolu; x++)
847	>	if (zscan(y)[x] <= 0) {         /* empty pixel */
848		/*
849		* First, find background from above or below.
850		* (farthest assigned pixel)
851		*/
852		if (yback[x] == -2) {
853	<	for (i = y+1; i < ourview.vresolu; i++)
854	<	if (zscan(i)[x] > 0.0)
853	>	for (i = y+1; i < vresolu; i++)
854	>	if (zscan(i)[x] > 0)
855		break;
856	<	if (i < ourview.vresolu
856	>	if (i < vresolu
857		&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
858		yback[x] = i;
859		else
#	Line 355 | Line 863 | fillpicture()                          /* fill in empty spaces */
863		* Next, find background from left or right.
864		*/
865		if (xback == -2) {
866	<	for (i = x+1; x < ourview.hresolu; i++)
867	<	if (zscan(y)[i] > 0.0)
866	>	for (i = x+1; i < hresolu; i++)
867	>	if (zscan(y)[i] > 0)
868		break;
869	<	if (i < ourview.hresolu
869	>	if (i < hresolu
870		&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
871		xback = i;
872		else
873		xback = x-1;
874		}
875	+	/*
876	+	* If we have no background for this pixel,
877	+	* use the given fill function.
878	+	*/
879		if (xback < 0 && yback[x] < 0)
880	<	continue;       /* no background */
880	>	goto fillit;
881		/*
882		* Compare, and use the background that is
883		* farther, unless one of them is next to us.
884	+	* If the background is too distant, call
885	+	* the fill function.
886		*/
887	<	if (yback[x] < 0 || ABS(x-xback) <= 1
887	>	if ( yback[x] < 0
888	>	|| (xback >= 0 && ABS(x-xback) <= 1)
889		|| ( ABS(y-yback[x]) > 1
890	<	&& zscan(yback[x])[x] < zscan(y)[xback] ))
891	<	copycolr(pscan(y)[x],pscan(y)[xback]);
892	<	else
893	<	copycolr(pscan(y)[x],pscan(yback[x])[x]);
890	>	&& zscan(yback[x])[x]
891	>	< zscan(y)[xback] ) ) {
892	>	if (samp > 0 && ABS(x-xback) >= samp)
893	>	goto fillit;
894	>	if (averaging) {
895	>	copycolor(sscan(y)[x],
896	>	sscan(y)[xback]);
897	>	wscan(y)[x] = wscan(y)[xback];
898	>	} else
899	>	copycolr(pscan(y)[x],
900	>	pscan(y)[xback]);
901	>	zscan(y)[x] = zscan(y)[xback];
902	>	} else {
903	>	if (samp > 0 && ABS(y-yback[x]) > samp)
904	>	goto fillit;
905	>	if (averaging) {
906	>	copycolor(sscan(y)[x],
907	>	sscan(yback[x])[x]);
908	>	wscan(y)[x] =
909	>	wscan(yback[x])[x];
910	>	} else
911	>	copycolr(pscan(y)[x],
912	>	pscan(yback[x])[x]);
913	>	zscan(y)[x] = zscan(yback[x])[x];
914	>	}
915	>	continue;
916	>	fillit:
917	>	(*fill)(x,y);
918	>	if (fill == rcalfill) {         /* use it */
919	>	clearqueue();
920	>	xback = x;
921	>	yback[x] = y;
922	>	}
923		} else {                                /* full pixel */
924		yback[x] = -2;
925		xback = -2;
926		}
927		}
928	<	free((char *)yback);
928	>	free((void *)yback);
929		}
930
931
932	<	writepicture()                          /* write out picture */
932	>	fillpicture(fill)               /* paint in empty pixels using fill */
933	>	int     (*fill)();
934		{
935	+	register int    x, y;
936	+
937	+	for (y = 0; y < vresolu; y++)
938	+	for (x = 0; x < hresolu; x++)
939	+	if (zscan(y)[x] <= 0)
940	+	(*fill)(x,y);
941	+	if (fill == rcalfill)
942	+	clearqueue();
943	+	}
944	+
945	+
946	+	clipaft()                       /* perform aft clipping as indicated */
947	+	{
948	+	register int    x, y;
949	+	int     adjtest = (ourview.type == VT_PER) & zisnorm;
950	+	double  tstdist;
951	+	double  yzn2, vx;
952	+
953	+	if (ourview.vaft <= FTINY)
954	+	return(0);
955	+	tstdist = ourview.vaft - ourview.vfore;
956	+	for (y = 0; y < vresolu; y++) {
957	+	if (adjtest) {                          /* adjust test */
958	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
959	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
960	+	tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
961	+	}
962	+	for (x = 0; x < hresolu; x++)
963	+	if (zscan(y)[x] > tstdist) {
964	+	if (adjtest) {
965	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
966	+	if (zscan(y)[x] <= (ourview.vaft -
967	+	ourview.vfore) *
968	+	sqrt(vx*vx*ourview.hn2 + yzn2))
969	+	continue;
970	+	}
971	+	if (averaging)
972	+	memset(sscan(y)[x], '\0', sizeof(COLOR));
973	+	else
974	+	memset(pscan(y)[x], '\0', sizeof(COLR));
975	+	zscan(y)[x] = 0.0;
976	+	}
977	+	}
978	+	return(1);
979	+	}
980	+
981	+
982	+	addblur()                               /* add to blurred picture */
983	+	{
984	+	COLOR   cval;
985	+	double  d;
986	+	register int    i;
987	+
988	+	if (!blurring)
989	+	return(0);
990	+	i = hresolu*vresolu;
991	+	if (nvavg < 2)
992	+	if (averaging)
993	+	while (i--) {
994	+	copycolor(ourbpict[i], ourspict[i]);
995	+	d = 1.0/ourweigh[i];
996	+	scalecolor(ourbpict[i], d);
997	+	}
998	+	else
999	+	while (i--)
1000	+	colr_color(ourbpict[i], ourpict[i]);
1001	+	else
1002	+	if (averaging)
1003	+	while (i--) {
1004	+	copycolor(cval, ourspict[i]);
1005	+	d = 1.0/ourweigh[i];
1006	+	scalecolor(cval, d);
1007	+	addcolor(ourbpict[i], cval);
1008	+	}
1009	+	else
1010	+	while (i--) {
1011	+	colr_color(cval, ourpict[i]);
1012	+	addcolor(ourbpict[i], cval);
1013	+	}
1014	+	/* print view */
1015	+	printf("VIEW%d:", nvavg);
1016	+	fprintview(&ourview, stdout);
1017	+	putchar('\n');
1018	+	return(1);
1019	+	}
1020	+
1021	+
1022	+	writepicture()                          /* write out picture (alters buffer) */
1023	+	{
1024		int     y;
1025	+	register int    x;
1026	+	double  d;
1027
1028	<	fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout);
1029	<	for (y = ourview.vresolu-1; y >= 0; y--)
1030	<	if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) {
1031	<	perror(progname);
1032	<	exit(1);
1028	>	fprtresolu(hresolu, vresolu, stdout);
1029	>	for (y = vresolu-1; y >= 0; y--)
1030	>	if (blurring) {
1031	>	for (x = 0; x < hresolu; x++) { /* compute avg. */
1032	>	d = rexpadj/nvavg;
1033	>	scalecolor(bscan(y)[x], d);
1034	>	}
1035	>	if (fwritescan(bscan(y), hresolu, stdout) < 0)
1036	>	syserror(progname);
1037	>	} else if (averaging) {
1038	>	for (x = 0; x < hresolu; x++) { /* average pixels */
1039	>	d = rexpadj/wscan(y)[x];
1040	>	scalecolor(sscan(y)[x], d);
1041	>	}
1042	>	if (fwritescan(sscan(y), hresolu, stdout) < 0)
1043	>	syserror(progname);
1044	>	} else {
1045	>	if (expadj)
1046	>	shiftcolrs(pscan(y), hresolu, expadj);
1047	>	if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1048	>	syserror(progname);
1049		}
1050	+	}
1051	+
1052	+
1053	+	writedistance(fname)                    /* write out z file (alters buffer) */
1054	+	char    *fname;
1055	+	{
1056	+	int     donorm = normdist & !zisnorm ? 1 :
1057	+	(ourview.type == VT_PER) & !normdist & zisnorm ? -1 : 0;
1058	+	int     fd;
1059	+	int     y;
1060	+
1061	+	if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1062	+	syserror(fname);
1063	+	for (y = vresolu-1; y >= 0; y--) {
1064	+	if (donorm) {
1065	+	double  vx, yzn2, d;
1066	+	register int    x;
1067	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1068	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1069	+	for (x = 0; x < hresolu; x++) {
1070	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
1071	+	d = sqrt(vx*vx*ourview.hn2 + yzn2);
1072	+	if (donorm > 0)
1073	+	zscan(y)[x] *= d;
1074	+	else
1075	+	zscan(y)[x] /= d;
1076	+	}
1077	+	}
1078	+	if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1079	+	< hresolu*sizeof(float))
1080	+	syserror(fname);
1081	+	}
1082	+	close(fd);
1083	+	}
1084	+
1085	+
1086	+	backfill(x, y)                          /* fill pixel with background */
1087	+	int     x, y;
1088	+	{
1089	+	if (averaging) {
1090	+	copycolor(sscan(y)[x], backcolor);
1091	+	wscan(y)[x] = 1;
1092	+	} else
1093	+	copycolr(pscan(y)[x], backcolr);
1094	+	zscan(y)[x] = backz;
1095	+	}
1096	+
1097	+
1098	+	calstart(prog, args)                    /* start fill calculation */
1099	+	char    *prog, *args;
1100	+	{
1101	+	char    combuf[512];
1102	+	char    *argv[64];
1103	+	int     rval;
1104	+	register char   **wp, *cp;
1105	+
1106	+	if (PDesc.running) {
1107	+	fprintf(stderr, "%s: too many calculations\n", progname);
1108	+	exit(1);
1109	+	}
1110	+	strcpy(combuf, prog);
1111	+	strcat(combuf, args);
1112	+	cp = combuf;
1113	+	wp = argv;
1114	+	for ( ; ; ) {
1115	+	while (isspace(*cp))    /* nullify spaces */
1116	+	*cp++ = '\0';
1117	+	if (!*cp)               /* all done? */
1118	+	break;
1119	+	*wp++ = cp;             /* add argument to list */
1120	+	while (*++cp && !isspace(*cp))
1121	+	;
1122	+	}
1123	+	*wp = NULL;
1124	+	/* start process */
1125	+	if ((rval = open_process(&PDesc, argv)) < 0)
1126	+	syserror(progname);
1127	+	if (rval == 0) {
1128	+	fprintf(stderr, "%s: command not found\n", argv[0]);
1129	+	exit(1);
1130	+	}
1131	+	packsiz = rval/(6*sizeof(float)) - 1;
1132	+	if (packsiz > PACKSIZ)
1133	+	packsiz = PACKSIZ;
1134	+	queuesiz = 0;
1135	+	}
1136	+
1137	+
1138	+	caldone()                               /* done with calculation */
1139	+	{
1140	+	if (!PDesc.running)
1141	+	return;
1142	+	clearqueue();
1143	+	close_process(&PDesc);
1144	+	}
1145	+
1146	+
1147	+	rcalfill(x, y)                          /* fill with ray-calculated pixel */
1148	+	int     x, y;
1149	+	{
1150	+	if (queuesiz >= packsiz)        /* flush queue if needed */
1151	+	clearqueue();
1152	+	/* add position to queue */
1153	+	queue[queuesiz][0] = x;
1154	+	queue[queuesiz][1] = y;
1155	+	queuesiz++;
1156	+	}
1157	+
1158	+
1159	+	clearqueue()                            /* process queue */
1160	+	{
1161	+	FVECT   orig, dir;
1162	+	float   fbuf[6*(PACKSIZ+1)];
1163	+	register float  *fbp;
1164	+	register int    i;
1165	+	double  vx, vy;
1166	+
1167	+	if (queuesiz == 0)
1168	+	return;
1169	+	fbp = fbuf;
1170	+	for (i = 0; i < queuesiz; i++) {
1171	+	viewray(orig, dir, &ourview,
1172	+	(queue[i][0]+.5)/hresolu,
1173	+	(queue[i][1]+.5)/vresolu);
1174	+	*fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1175	+	*fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1176	+	}
1177	+	/* mark end and get results */
1178	+	memset((char *)fbp, '\0', 6*sizeof(float));
1179	+	if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1180	+	4*sizeof(float)*(queuesiz+1),
1181	+	6*sizeof(float)*(queuesiz+1)) !=
1182	+	4*sizeof(float)*(queuesiz+1)) {
1183	+	fprintf(stderr, "%s: error reading from rtrace process\n",
1184	+	progname);
1185	+	exit(1);
1186	+	}
1187	+	fbp = fbuf;
1188	+	for (i = 0; i < queuesiz; i++) {
1189	+	if (ourexp > 0 && ourexp != 1.0) {
1190	+	fbp[0] *= ourexp;
1191	+	fbp[1] *= ourexp;
1192	+	fbp[2] *= ourexp;
1193	+	}
1194	+	if (averaging) {
1195	+	setcolor(sscan(queue[i][1])[queue[i][0]],
1196	+	fbp[0], fbp[1], fbp[2]);
1197	+	wscan(queue[i][1])[queue[i][0]] = 1;
1198	+	} else
1199	+	setcolr(pscan(queue[i][1])[queue[i][0]],
1200	+	fbp[0], fbp[1], fbp[2]);
1201	+	if (zisnorm)
1202	+	zscan(queue[i][1])[queue[i][0]] = fbp[3];
1203	+	else {
1204	+	vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1205	+	vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1206	+	zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1207	+	vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1208	+	}
1209	+	fbp += 4;
1210	+	}
1211	+	queuesiz = 0;
1212	+	}
1213	+
1214	+
1215	+	syserror(s)                     /* report error and exit */
1216	+	char    *s;
1217	+	{
1218	+	perror(s);
1219	+	exit(1);
1220		}

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