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

Comparing ray/src/px/pinterp.c (file contents):
Revision 1.1 by greg, Sun Dec 10 17:34:13 1989 UTC vs.
Revision 2.27 by greg, Mon Oct 16 11:40:16 1995 UTC

#	Line 1 | Line 1
1	+	/* Copyright (c) 1995 Regents of the University of California */
2	+
3		#ifndef lint
4		static char SCCSid[] = "$SunId$ LBL";
5		#endif
#	Line 10 | Line 12 | static char SCCSid[] = "$SunId$ LBL";
12
13		#include "standard.h"
14
15	+	#include <ctype.h>
16	+
17		#include "view.h"
18
19		#include "color.h"
20
21	<	#define pscan(y)        (ourpict+(y)*ourview.hresolu)
18	<	#define zscan(y)        (ourzbuf+(y)*ourview.hresolu)
21	>	#include "resolu.h"
22
23	<	VIEW    ourview = STDVIEW(512);         /* desired view */
23	>	#define LOG2            0.69314718055994530942
24
25	<	double  zeps = 0.001;                   /* allowed z epsilon */
25	>	#define pscan(y)        (ourpict+(y)*hresolu)
26	>	#define sscan(y)        (ourspict+(y)*hresolu)
27	>	#define wscan(y)        (ourweigh+(y)*hresolu)
28	>	#define zscan(y)        (ourzbuf+(y)*hresolu)
29	>	#define bscan(y)        (ourbpict+(y)*hresolu)
30	>	#define averaging       (ourweigh != NULL)
31	>	#define blurring        (ourbpict != NULL)
32	>	#define usematrix       (hasmatrix & !averaging)
33	>	#define zisnorm         (!usematrix | ourview.type != VT_PER)
34
35	<	COLR    *ourpict;                       /* output picture */
35	>	#define MAXWT           1000.           /* maximum pixel weight (averaging) */
36	>
37	>	#define F_FORE          1               /* fill foreground */
38	>	#define F_BACK          2               /* fill background */
39	>
40	>	#define PACKSIZ         256             /* max. calculation packet size */
41	>
42	>	#define RTCOM           "rtrace -h- -ovl -fff "
43	>
44	>	#define ABS(x)          ((x)>0?(x):-(x))
45	>
46	>	struct position {int x,y; float z;};
47	>
48	>	#define NSTEPS          64              /* number steps in overlap prescan */
49	>	#define MINSTEP         4               /* minimum worthwhile preview step */
50	>
51	>	struct bound {int min,max;};
52	>
53	>	VIEW    ourview = STDVIEW;              /* desired view */
54	>	int     hresolu = 512;                  /* horizontal resolution */
55	>	int     vresolu = 512;                  /* vertical resolution */
56	>	double  pixaspect = 1.0;                /* pixel aspect ratio */
57	>
58	>	double  zeps = .02;                     /* allowed z epsilon */
59	>
60	>	COLR    *ourpict;                       /* output picture (COLR's) */
61	>	COLOR   *ourspict;                      /* output pixel sums (averaging) */
62	>	float   *ourweigh = NULL;               /* output pixel weights (averaging) */
63		float   *ourzbuf;                       /* corresponding z-buffer */
64	+	COLOR   *ourbpict = NULL;               /* blurred picture (view averaging) */
65
66	+	VIEW    avgview;                        /* average view for -B option */
67	+	int     nvavg;                          /* number of views averaged */
68	+
69		char    *progname;
70
71	<	VIEW    theirview = STDVIEW(512);       /* input view */
71	>	int     fillo = F_FORE|F_BACK;          /* selected fill options */
72	>	int     fillsamp = 0;                   /* sample separation (0 == inf) */
73	>	extern int      backfill(), rcalfill(); /* fill functions */
74	>	int     (*fillfunc)() = backfill;       /* selected fill function */
75	>	COLR    backcolr = BLKCOLR;             /* background color */
76	>	COLOR   backcolor = BLKCOLOR;           /* background color (float) */
77	>	double  backz = 0.0;                    /* background z value */
78	>	int     normdist = 1;                   /* i/o normalized distance? */
79	>	char    ourfmt[LPICFMT+1] = PICFMT;     /* original picture format */
80	>	double  ourexp = -1;                    /* original picture exposure */
81	>	int     expadj = 0;                     /* exposure adjustment (f-stops) */
82	>	double  rexpadj = 1;                    /* real exposure adjustment */
83	>
84	>	VIEW    theirview;                      /* input view */
85		int     gotview;                        /* got input view? */
86	+	int     wrongformat = 0;                /* input in another format? */
87	+	RESOLU  tresolu;                        /* input resolution */
88	+	double  theirexp;                       /* input picture exposure */
89	+	MAT4    theirs2ours;                    /* transformation matrix */
90	+	int     hasmatrix = 0;                  /* has transformation matrix */
91
92	+	int     PDesc[3] = {-1,-1,-1};          /* rtrace process descriptor */
93	+	#define childpid        (PDesc[2])
94	+	unsigned short  queue[PACKSIZ][2];      /* pending pixels */
95	+	int     packsiz;                        /* actual packet size */
96	+	int     queuesiz = 0;                   /* number of pixels pending */
97
98	+	extern double   movepixel();
99	+
100	+
101		main(argc, argv)                        /* interpolate pictures */
102		int     argc;
103		char    *argv[];
104		{
105	<	#define check(olen,narg)        if (argv[i][olen] || narg >= argc-i) goto badopt
105	>	#define  check(ol,al)           if (argv[an][ol] || \
106	>	badarg(argc-an-1,argv+an+1,al)) \
107	>	goto badopt
108		int     gotvfile = 0;
109	<	char    *err;
110	<	int     i;
109	>	int     doavg = -1;
110	>	int     doblur = 0;
111	>	char    *zfile = NULL;
112	>	char    *expcomp = NULL;
113	>	int     i, an, rval;
114
115		progname = argv[0];
116
117	<	for (i = 1; i < argc && argv[i][0] == '-'; i++)
118	<	switch (argv[i][1]) {
117	>	for (an = 1; an < argc && argv[an][0] == '-'; an++) {
118	>	rval = getviewopt(&ourview, argc-an, argv+an);
119	>	if (rval >= 0) {
120	>	an += rval;
121	>	continue;
122	>	}
123	>	switch (argv[an][1]) {
124	>	case 'e':                               /* exposure */
125	>	check(2,"f");
126	>	expcomp = argv[++an];
127	>	break;
128		case 't':                               /* threshold */
129	<	check(2,1);
130	<	zeps = atof(argv[++i]);
129	>	check(2,"f");
130	>	zeps = atof(argv[++an]);
131		break;
132	<	case 'v':                               /* view */
133	<	switch (argv[i][2]) {
134	<	case 't':                               /* type */
135	<	check(4,0);
136	<	ourview.type = argv[i][3];
132	>	case 'a':                               /* average */
133	>	check(2,NULL);
134	>	doavg = 1;
135	>	break;
136	>	case 'B':                               /* blur views */
137	>	check(2,NULL);
138	>	doblur = 1;
139	>	break;
140	>	case 'q':                               /* quick (no avg.) */
141	>	check(2,NULL);
142	>	doavg = 0;
143	>	break;
144	>	case 'n':                               /* dist. normalized? */
145	>	check(2,NULL);
146	>	normdist = !normdist;
147	>	break;
148	>	case 'f':                               /* fill type */
149	>	switch (argv[an][2]) {
150	>	case '0':                               /* none */
151	>	check(3,NULL);
152	>	fillo = 0;
153		break;
154	<	case 'p':                               /* point */
155	<	check(3,3);
156	<	ourview.vp[0] = atof(argv[++i]);
59	<	ourview.vp[1] = atof(argv[++i]);
60	<	ourview.vp[2] = atof(argv[++i]);
154	>	case 'f':                               /* foreground */
155	>	check(3,NULL);
156	>	fillo = F_FORE;
157		break;
158	<	case 'd':                               /* direction */
159	<	check(3,3);
160	<	ourview.vdir[0] = atof(argv[++i]);
65	<	ourview.vdir[1] = atof(argv[++i]);
66	<	ourview.vdir[2] = atof(argv[++i]);
158	>	case 'b':                               /* background */
159	>	check(3,NULL);
160	>	fillo = F_BACK;
161		break;
162	<	case 'u':                               /* up */
163	<	check(3,3);
164	<	ourview.vup[0] = atof(argv[++i]);
71	<	ourview.vup[1] = atof(argv[++i]);
72	<	ourview.vup[2] = atof(argv[++i]);
162	>	case 'a':                               /* all */
163	>	check(3,NULL);
164	>	fillo = F_FORE|F_BACK;
165		break;
166	<	case 'h':                               /* horizontal */
167	<	check(3,1);
168	<	ourview.horiz = atof(argv[++i]);
166	>	case 's':                               /* sample */
167	>	check(3,"i");
168	>	fillsamp = atoi(argv[++an]);
169		break;
170	<	case 'v':                               /* vertical */
171	<	check(3,1);
172	<	ourview.vert = atof(argv[++i]);
170	>	case 'c':                               /* color */
171	>	check(3,"fff");
172	>	fillfunc = backfill;
173	>	setcolor(backcolor, atof(argv[an+1]),
174	>	atof(argv[an+2]), atof(argv[an+3]));
175	>	setcolr(backcolr, colval(backcolor,RED),
176	>	colval(backcolor,GRN),
177	>	colval(backcolor,BLU));
178	>	an += 3;
179		break;
180	<	case 'f':                               /* file */
181	<	check(3,1);
182	<	gotvfile = viewfile(argv[++i], &ourview);
183	<	if (gotvfile < 0) {
86	<	perror(argv[i]);
87	<	exit(1);
88	<	} else if (gotvfile == 0) {
89	<	fprintf(stderr, "%s: bad view file\n",
90	<	argv[i]);
91	<	exit(1);
92	<	}
180	>	case 'z':                               /* z value */
181	>	check(3,"f");
182	>	fillfunc = backfill;
183	>	backz = atof(argv[++an]);
184		break;
185	+	case 'r':                               /* rtrace */
186	+	check(3,"s");
187	+	fillfunc = rcalfill;
188	+	calstart(RTCOM, argv[++an]);
189	+	break;
190		default:
191		goto badopt;
192		}
193		break;
194	+	case 'z':                               /* z file */
195	+	check(2,"s");
196	+	zfile = argv[++an];
197	+	break;
198	+	case 'x':                               /* x resolution */
199	+	check(2,"i");
200	+	hresolu = atoi(argv[++an]);
201	+	break;
202	+	case 'y':                               /* y resolution */
203	+	check(2,"i");
204	+	vresolu = atoi(argv[++an]);
205	+	break;
206	+	case 'p':                               /* pixel aspect */
207	+	if (argv[an][2] != 'a')
208	+	goto badopt;
209	+	check(3,"f");
210	+	pixaspect = atof(argv[++an]);
211	+	break;
212	+	case 'v':                               /* view file */
213	+	if (argv[an][2] != 'f')
214	+	goto badopt;
215	+	check(3,"s");
216	+	gotvfile = viewfile(argv[++an], &ourview, 0, 0);
217	+	if (gotvfile < 0)
218	+	syserror(argv[an]);
219	+	else if (gotvfile == 0) {
220	+	fprintf(stderr, "%s: bad view file\n",
221	+	argv[an]);
222	+	exit(1);
223	+	}
224	+	break;
225		default:
226		badopt:
227	<	fprintf(stderr, "%s: unknown option '%s'\n",
228	<	progname, argv[i]);
229	<	exit(1);
227	>	fprintf(stderr, "%s: command line error at '%s'\n",
228	>	progname, argv[an]);
229	>	goto userr;
230		}
231	+	}
232		/* check arguments */
233	<	if (argc-i < 2 || (argc-i)%2) {
234	<	fprintf(stderr, "Usage: %s [view args] pfile zfile ..\n",
233	>	if ((argc-an)%2)
234	>	goto userr;
235	>	if (fillsamp == 1)
236	>	fillo &= ~F_BACK;
237	>	if (doavg < 0)
238	>	doavg = (argc-an) > 2;
239	>	if (expcomp != NULL)
240	>	if (expcomp[0] == '+' | expcomp[0] == '-') {
241	>	expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
242	>	if (doavg | doblur)
243	>	rexpadj = pow(2.0, atof(expcomp));
244	>	else
245	>	rexpadj = pow(2.0, (double)expadj);
246	>	} else {
247	>	if (!isflt(expcomp))
248	>	goto userr;
249	>	rexpadj = atof(expcomp);
250	>	expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
251	>	if (!(doavg | doblur))
252	>	rexpadj = pow(2.0, (double)expadj);
253	>	}
254	>	/* set view */
255	>	if (nextview(doblur ? stdin : NULL) == EOF) {
256	>	fprintf(stderr, "%s: no view on standard input!\n",
257		progname);
258		exit(1);
259		}
260	<	/* set view */
111	<	if (err = setview(&ourview)) {
112	<	fprintf(stderr, "%s: %s\n", progname, err);
113	<	exit(1);
114	<	}
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	>	/* run pictures */
283	>	do {
284	>	bzero((char *)ourzbuf, hresolu*vresolu*sizeof(float));
285	>	for (i = an; i < argc; i += 2)
286	>	addpicture(argv[i], argv[i+1]);
287	>	if (fillo&F_BACK)                       /* fill in spaces */
288	>	backpicture(fillfunc, fillsamp);
289	>	else
290	>	fillpicture(fillfunc);
291	>	/* aft clipping */
292	>	clipaft();
293	>	} while (addblur() && nextview(stdin) != EOF);
294	>	/* close calculation */
295	>	caldone();
296		/* add to header */
297		printargs(argc, argv, stdout);
298	<	if (gotvfile) {
299	<	printf(VIEWSTR);
300	<	fprintview(&ourview, stdout);
301	<	printf("\n");
298	>	compavgview();
299	>	if (doblur | gotvfile) {
300	>	fputs(VIEWSTR, stdout);
301	>	fprintview(&avgview, stdout);
302	>	putc('\n', stdout);
303		}
304	<	printf("\n");
305	<	/* write output */
304	>	if (pixaspect < .99 | pixaspect > 1.01)
305	>	fputaspect(pixaspect, stdout);
306	>	if (ourexp > 0)
307	>	ourexp *= rexpadj;
308	>	else
309	>	ourexp = rexpadj;
310	>	if (ourexp < .995 | ourexp > 1.005)
311	>	fputexpos(ourexp, stdout);
312	>	if (strcmp(ourfmt, PICFMT))             /* print format if known */
313	>	fputformat(ourfmt, stdout);
314	>	putc('\n', stdout);
315	>	/* write picture */
316		writepicture();
317	+	/* write z file */
318	+	if (zfile != NULL)
319	+	writedistance(zfile);
320
321		exit(0);
322	+	userr:
323	+	fprintf(stderr,
324	+	"Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
325	+	progname);
326	+	exit(1);
327		#undef check
328		}
329
#	Line 143 | Line 331 | char   *argv[];
331		headline(s)                             /* process header string */
332		char    *s;
333		{
334	<	static char     *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL};
147	<	register char   **an;
334	>	char    fmt[32];
335
336	<	printf("\t%s", s);
337	<
338	<	for (an = altname; *an != NULL; an++)
339	<	if (!strncmp(*an, s, strlen(*an))) {
340	<	if (sscanview(&theirview, s+strlen(*an)) == 0)
341	<	gotview++;
342	<	break;
343	<	}
336	>	if (isheadid(s))
337	>	return;
338	>	if (formatval(fmt, s)) {
339	>	if (globmatch(ourfmt, fmt)) {
340	>	wrongformat = 0;
341	>	strcpy(ourfmt, fmt);
342	>	} else
343	>	wrongformat = 1;
344	>	return;
345	>	}
346	>	if (nvavg < 2) {
347	>	putc('\t', stdout);
348	>	fputs(s, stdout);
349	>	}
350	>	if (isexpos(s)) {
351	>	theirexp *= exposval(s);
352	>	return;
353	>	}
354	>	if (isview(s) && sscanview(&theirview, s) > 0)
355	>	gotview++;
356		}
357
358
359	<	addpicture(pfile, zfile)                /* add picture to output */
360	<	char    *pfile, *zfile;
359	>	nextview(fp)                            /* get and set next view */
360	>	FILE    *fp;
361		{
362	<	FILE    *pfp, *zfp;
164	<	COLR    *scanin;
165	<	float   *zin;
362	>	char    linebuf[256];
363		char    *err;
364	<	int     xres, yres;
365	<	int     y;
366	<	/* open input files */
367	<	if ((pfp = fopen(pfile, "r")) == NULL) {
368	<	perror(pfile);
369	<	exit(1);
364	>	register int    i;
365	>
366	>	if (fp != NULL) {
367	>	do                      /* get new view */
368	>	if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
369	>	return(EOF);
370	>	while (!isview(linebuf) || !sscanview(&ourview, linebuf));
371		}
372	<	if ((zfp = fopen(zfile, "r")) == NULL) {
373	<	perror(zfile);
372	>	/* set new view */
373	>	if ((err = setview(&ourview)) != NULL) {
374	>	fprintf(stderr, "%s: %s\n", progname, err);
375		exit(1);
376		}
377	<	/* get header and view */
378	<	printf("%s:\n", pfile);
377	>	if (!nvavg) {                   /* first view */
378	>	copystruct(&avgview, &ourview);
379	>	return(nvavg++);
380	>	}
381	>	/* add to average view */
382	>	for (i = 0; i < 3; i++) {
383	>	avgview.vp[i] += ourview.vp[i];
384	>	avgview.vdir[i] += ourview.vdir[i];
385	>	avgview.vup[i] += ourview.vup[i];
386	>	}
387	>	avgview.horiz += ourview.horiz;
388	>	avgview.vert += ourview.vert;
389	>	avgview.hoff += ourview.hoff;
390	>	avgview.voff += ourview.voff;
391	>	avgview.vfore += ourview.vfore;
392	>	avgview.vaft += ourview.vaft;
393	>	return(nvavg++);
394	>	}
395	>
396	>
397	>	compavgview()                           /* compute average view */
398	>	{
399	>	register int    i;
400	>	double  f;
401	>
402	>	if (nvavg < 2)
403	>	return;
404	>	f = 1.0/nvavg;
405	>	for (i = 0; i < 3; i++) {
406	>	avgview.vp[i] *= f;
407	>	avgview.vdir[i] *= f;
408	>	avgview.vup[i] *= f;
409	>	}
410	>	avgview.horiz *= f;
411	>	avgview.vert *= f;
412	>	avgview.hoff *= f;
413	>	avgview.voff *= f;
414	>	avgview.vfore *= f;
415	>	avgview.vaft *= f;
416	>	if (setview(&avgview) != NULL)          /* in case of emergency... */
417	>	copystruct(&avgview, &ourview);
418	>	pixaspect = viewaspect(&avgview) * hresolu / vresolu;
419	>	}
420	>
421	>
422	>	addpicture(pfile, zspec)                /* add picture to output */
423	>	char    *pfile, *zspec;
424	>	{
425	>	FILE    *pfp;
426	>	int     zfd;
427	>	char    *err;
428	>	COLR    *scanin;
429	>	float   *zin;
430	>	struct position *plast;
431	>	struct bound    *xlim, ylim;
432	>	int     y;
433	>	/* open picture file */
434	>	if ((pfp = fopen(pfile, "r")) == NULL)
435	>	syserror(pfile);
436	>	/* get header with exposure and view */
437	>	theirexp = 1.0;
438	>	copystruct(&theirview, &stdview);
439		gotview = 0;
440	<	getheader(pfp, headline);
441	<	if (!gotview || fgetresolu(&xres, &yres, pfp) != (YMAJOR|YDECR)) {
442	<	fprintf(stderr, "%s: picture view error\n", pfile);
440	>	if (nvavg < 2)
441	>	printf("%s:\n", pfile);
442	>	getheader(pfp, headline, NULL);
443	>	if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
444	>	fprintf(stderr, "%s: picture format error\n", pfile);
445		exit(1);
446		}
447	<	theirview.hresolu = xres;
448	<	theirview.vresolu = yres;
447	>	if (ourexp <= 0)
448	>	ourexp = theirexp;
449	>	else if (ABS(theirexp-ourexp) > .01*ourexp)
450	>	fprintf(stderr, "%s: different exposure (warning)\n", pfile);
451		if (err = setview(&theirview)) {
452		fprintf(stderr, "%s: %s\n", pfile, err);
453		exit(1);
454		}
455	<	/* allocate scanlines */
456	<	scanin = (COLR *)malloc(xres*sizeof(COLR));
457	<	zin = (float *)malloc(xres*sizeof(float));
458	<	if (scanin == NULL || zin == NULL) {
459	<	perror(progname);
460	<	exit(1);
455	>	/* compute transformation */
456	>	hasmatrix = pixform(theirs2ours, &theirview, &ourview);
457	>	/* get z specification or file */
458	>	zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
459	>	if (zin == NULL)
460	>	syserror(progname);
461	>	if ((zfd = open(zspec, O_RDONLY)) == -1) {
462	>	double  zvalue;
463	>	register int    x;
464	>	if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
465	>	syserror(zspec);
466	>	for (x = scanlen(&tresolu); x-- > 0; )
467	>	zin[x] = zvalue;
468		}
469	<	/* load image */
470	<	for (y = yres-1; y >= 0; y--) {
471	<	if (freadcolrs(scanin, xres, pfp) < 0) {
469	>	/* compute transferrable perimeter */
470	>	xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
471	>	if (xlim == NULL)
472	>	syserror(progname);
473	>	if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
474	>	free((char *)zin);
475	>	free((char *)xlim);
476	>	if (zfd != -1)
477	>	close(zfd);
478	>	fclose(pfp);
479	>	return;
480	>	}
481	>	/* allocate scanlines */
482	>	scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
483	>	plast = (struct position *)calloc(scanlen(&tresolu),
484	>	sizeof(struct position));
485	>	if (scanin == NULL | plast == NULL)
486	>	syserror(progname);
487	>	/* skip to starting point */
488	>	for (y = 0; y < ylim.min; y++)
489	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
490		fprintf(stderr, "%s: read error\n", pfile);
491		exit(1);
492		}
493	<	if (fread(zin, sizeof(float), xres, zfp) < xres) {
494	<	fprintf(stderr, "%s: read error\n", zfile);
493	>	if (zfd != -1 && lseek(zfd,
494	>	(long)ylim.min*scanlen(&tresolu)*sizeof(float), 0) < 0)
495	>	syserror(zspec);
496	>	/* load image */
497	>	for (y = ylim.min; y <= ylim.max; y++) {
498	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
499	>	fprintf(stderr, "%s: read error\n", pfile);
500		exit(1);
501		}
502	<	addscanline(y, scanin, zin);
502	>	if (zfd != -1 && read(zfd, (char *)zin,
503	>	scanlen(&tresolu)*sizeof(float))
504	>	< scanlen(&tresolu)*sizeof(float))
505	>	syserror(zspec);
506	>	addscanline(xlim+y, y, scanin, zin, plast);
507		}
508		/* clean up */
509	+	free((char *)xlim);
510		free((char *)scanin);
511		free((char *)zin);
512	+	free((char *)plast);
513		fclose(pfp);
514	<	fclose(zfp);
514	>	if (zfd != -1)
515	>	close(zfd);
516		}
517
518
519	<	addscanline(y, pline, zline)            /* add scanline to output */
519	>	pixform(xfmat, vw1, vw2)                /* compute view1 to view2 matrix */
520	>	register MAT4   xfmat;
521	>	register VIEW   *vw1, *vw2;
522	>	{
523	>	double  m4t[4][4];
524	>
525	>	if (vw1->type != VT_PER & vw1->type != VT_PAR)
526	>	return(0);
527	>	if (vw2->type != VT_PER & vw2->type != VT_PAR)
528	>	return(0);
529	>	setident4(xfmat);
530	>	xfmat[0][0] = vw1->hvec[0];
531	>	xfmat[0][1] = vw1->hvec[1];
532	>	xfmat[0][2] = vw1->hvec[2];
533	>	xfmat[1][0] = vw1->vvec[0];
534	>	xfmat[1][1] = vw1->vvec[1];
535	>	xfmat[1][2] = vw1->vvec[2];
536	>	xfmat[2][0] = vw1->vdir[0];
537	>	xfmat[2][1] = vw1->vdir[1];
538	>	xfmat[2][2] = vw1->vdir[2];
539	>	xfmat[3][0] = vw1->vp[0];
540	>	xfmat[3][1] = vw1->vp[1];
541	>	xfmat[3][2] = vw1->vp[2];
542	>	setident4(m4t);
543	>	m4t[0][0] = vw2->hvec[0]/vw2->hn2;
544	>	m4t[1][0] = vw2->hvec[1]/vw2->hn2;
545	>	m4t[2][0] = vw2->hvec[2]/vw2->hn2;
546	>	m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
547	>	m4t[0][1] = vw2->vvec[0]/vw2->vn2;
548	>	m4t[1][1] = vw2->vvec[1]/vw2->vn2;
549	>	m4t[2][1] = vw2->vvec[2]/vw2->vn2;
550	>	m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
551	>	m4t[0][2] = vw2->vdir[0];
552	>	m4t[1][2] = vw2->vdir[1];
553	>	m4t[2][2] = vw2->vdir[2];
554	>	m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
555	>	multmat4(xfmat, xfmat, m4t);
556	>	return(1);
557	>	}
558	>
559	>
560	>	addscanline(xl, y, pline, zline, lasty) /* add scanline to output */
561	>	struct bound    *xl;
562		int     y;
563		COLR    *pline;
564		float   *zline;
565	+	struct position *lasty;         /* input/output */
566		{
567	<	FVECT   p, dir;
568	<	double  xnew, ynew, znew;
567	>	FVECT   pos;
568	>	struct position lastx, newpos;
569	>	double  wt;
570		register int    x;
227	–	register int    xpos, ypos;
571
572	<	for (x = 0; x < theirview.hresolu; x++) {
573	<	rayview(p, dir, &theirview, x+.5, y+.5);
574	<	p[0] += zline[x]*dir[0];
575	<	p[1] += zline[x]*dir[1];
576	<	p[2] += zline[x]*dir[2];
577	<	pixelview(&xnew, &ynew, &znew, &ourview, p);
235	<	if (znew <= 0.0 || xnew < 0 || xnew > ourview.hresolu
236	<	|| ynew < 0 || ynew > ourview.vresolu)
572	>	lastx.z = 0;
573	>	for (x = xl->max; x >= xl->min; x--) {
574	>	pix2loc(pos, &tresolu, x, y);
575	>	pos[2] = zline[x];
576	>	if ((wt = movepixel(pos)) <= FTINY) {
577	>	lasty[x].z = lastx.z = 0;       /* mark invalid */
578		continue;
238	–	/* check current value at position */
239	–	xpos = xnew;
240	–	ypos = ynew;
241	–	if (zscan(ypos)[xpos] <= 0.0
242	–	|| zscan(ypos)[xpos] - znew
243	–	> zeps*zscan(ypos)[xpos]) {
244	–	zscan(ypos)[xpos] = znew;
245	–	copycolr(pscan(ypos)[xpos], pline[x]);
579		}
580	+	/* add pixel to our image */
581	+	newpos.x = pos[0] * hresolu;
582	+	newpos.y = pos[1] * vresolu;
583	+	newpos.z = zline[x];
584	+	addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
585	+	lasty[x].x = lastx.x = newpos.x;
586	+	lasty[x].y = lastx.y = newpos.y;
587	+	lasty[x].z = lastx.z = newpos.z;
588		}
589		}
590
591
592	<	fillpicture()                           /* fill in empty spaces */
592	>	addpixel(p0, p1, p2, pix, w, z)         /* fill in pixel parallelogram */
593	>	struct position *p0, *p1, *p2;
594	>	COLR    pix;
595	>	double  w;
596	>	double  z;
597		{
598	<	int     y;
599	<	COLR    cfill;
600	<	register int    x, xblank;
598	>	double  zt = 2.*zeps*p0->z;             /* threshold */
599	>	COLOR   pval;                           /* converted+weighted pixel */
600	>	int     s1x, s1y, s2x, s2y;             /* step sizes */
601	>	int     l1, l2, c1, c2;                 /* side lengths and counters */
602	>	int     p1isy;                          /* p0p1 along y? */
603	>	int     x1, y1;                         /* p1 position */
604	>	register int    x, y;                   /* final position */
605	>
606	>	/* compute vector p0p1 */
607	>	if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
608	>	s1x = p1->x - p0->x;
609	>	s1y = p1->y - p0->y;
610	>	l1 = ABS(s1x);
611	>	if (p1isy = (ABS(s1y) > l1))
612	>	l1 = ABS(s1y);
613	>	else if (l1 < 1)
614	>	l1 = 1;
615	>	} else {
616	>	l1 = s1x = s1y = 1;
617	>	p1isy = -1;
618	>	}
619	>	/* compute vector p0p2 */
620	>	if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
621	>	s2x = p2->x - p0->x;
622	>	s2y = p2->y - p0->y;
623	>	if (p1isy == 1)
624	>	l2 = ABS(s2x);
625	>	else {
626	>	l2 = ABS(s2y);
627	>	if (p1isy != 0 && ABS(s2x) > l2)
628	>	l2 = ABS(s2x);
629	>	}
630	>	if (l2 < 1)
631	>	l2 = 1;
632	>	} else
633	>	l2 = s2x = s2y = 1;
634	>	/* fill the parallelogram */
635	>	if (averaging) {
636	>	colr_color(pval, pix);
637	>	scalecolor(pval, w);
638	>	}
639	>	for (c1 = l1; c1-- > 0; ) {
640	>	x1 = p0->x + c1*s1x/l1;
641	>	y1 = p0->y + c1*s1y/l1;
642	>	for (c2 = l2; c2-- > 0; ) {
643	>	x = x1 + c2*s2x/l2;
644	>	if (x < 0 | x >= hresolu)
645	>	continue;
646	>	y = y1 + c2*s2y/l2;
647	>	if (y < 0 | y >= vresolu)
648	>	continue;
649	>	if (averaging) {
650	>	if (zscan(y)[x] <= 0 || zscan(y)[x]-z
651	>	> zeps*zscan(y)[x]) {
652	>	copycolor(sscan(y)[x], pval);
653	>	wscan(y)[x] = w;
654	>	zscan(y)[x] = z;
655	>	} else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
656	>	addcolor(sscan(y)[x], pval);
657	>	wscan(y)[x] += w;
658	>	}
659	>	} else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
660	>	> zeps*zscan(y)[x]) {
661	>	copycolr(pscan(y)[x], pix);
662	>	zscan(y)[x] = z;
663	>	}
664	>	}
665	>	}
666	>	}
667	>
668	>
669	>	double
670	>	movepixel(pos)                          /* reposition image point */
671	>	register FVECT  pos;
672	>	{
673	>	FVECT   pt, tdir, odir;
674	>	double  d;
675	>	register int    i;
676
677	<	for (y = 0; y < ourview.vresolu; y++) {
678	<	xblank = -1;
679	<	for (x = 0; x < ourview.hresolu; x++)
680	<	if (zscan(y)[x] <= 0.0) {
681	<	if (xblank < 0)
682	<	xblank = x;
683	<	} else if (xblank >= 0) {
684	<	if (xblank == 0 || zscan(y)[xblank-1] < zscan(y)[x])
685	<	copycolr(cfill, pscan(y)[x]);
686	<	else
687	<	copycolr(cfill, pscan(y)[xblank-1]);
688	<	for ( ; xblank < x; xblank++)
689	<	copycolr(pscan(y)[xblank], cfill);
690	<	xblank = -1;
677	>	if (pos[2] <= 0)                /* empty pixel */
678	>	return(0);
679	>	if (usematrix) {
680	>	pos[0] += theirview.hoff - .5;
681	>	pos[1] += theirview.voff - .5;
682	>	if (normdist & theirview.type == VT_PER)
683	>	d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
684	>	+ pos[1]*pos[1]*theirview.vn2);
685	>	else
686	>	d = 1.;
687	>	pos[2] += d*theirview.vfore;
688	>	if (theirview.type == VT_PER) {
689	>	pos[2] /= d;
690	>	pos[0] *= pos[2];
691	>	pos[1] *= pos[2];
692	>	}
693	>	multp3(pos, pos, theirs2ours);
694	>	if (pos[2] <= ourview.vfore)
695	>	return(0);
696	>	if (ourview.type == VT_PER) {
697	>	pos[0] /= pos[2];
698	>	pos[1] /= pos[2];
699	>	}
700	>	pos[0] += .5 - ourview.hoff;
701	>	pos[1] += .5 - ourview.voff;
702	>	pos[2] -= ourview.vfore;
703	>	} else {
704	>	if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
705	>	return(0);
706	>	if (!normdist & theirview.type == VT_PER)       /* adjust */
707	>	pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
708	>	+ pos[1]*pos[1]*theirview.vn2);
709	>	pt[0] += tdir[0]*pos[2];
710	>	pt[1] += tdir[1]*pos[2];
711	>	pt[2] += tdir[2]*pos[2];
712	>	viewloc(pos, &ourview, pt);
713	>	if (pos[2] <= 0)
714	>	return(0);
715	>	}
716	>	if (pos[0] < 0 | pos[0] >= 1-FTINY | pos[1] < 0 | pos[1] >= 1-FTINY)
717	>	return(0);
718	>	if (!averaging)
719	>	return(1);
720	>	if (ourview.type == VT_PAR)             /* compute our direction */
721	>	VCOPY(odir, ourview.vdir);
722	>	else
723	>	for (i = 0; i < 3; i++)
724	>	odir[i] = (pt[i] - ourview.vp[i])/pos[2];
725	>	d = DOT(odir,tdir);                     /* compute pixel weight */
726	>	if (d >= 1.-1./MAXWT/MAXWT)
727	>	return(MAXWT);          /* clip to maximum weight */
728	>	return(1./sqrt(1.-d));
729	>	}
730	>
731	>
732	>	getperim(xl, yl, zline, zfd)            /* compute overlapping image area */
733	>	register struct bound   *xl;
734	>	struct bound    *yl;
735	>	float   *zline;
736	>	int     zfd;
737	>	{
738	>	int     step;
739	>	FVECT   pos;
740	>	register int    x, y;
741	>	/* set up step size */
742	>	if (scanlen(&tresolu) < numscans(&tresolu))
743	>	step = scanlen(&tresolu)/NSTEPS;
744	>	else
745	>	step = numscans(&tresolu)/NSTEPS;
746	>	if (step < MINSTEP) {                   /* not worth cropping? */
747	>	yl->min = 0;
748	>	yl->max = numscans(&tresolu) - 1;
749	>	x = scanlen(&tresolu) - 1;
750	>	for (y = numscans(&tresolu); y--; ) {
751	>	xl[y].min = 0;
752	>	xl[y].max = x;
753	>	}
754	>	return(1);
755	>	}
756	>	yl->min = 32000; yl->max = 0;           /* search for points on image */
757	>	for (y = step - 1; y < numscans(&tresolu); y += step) {
758	>	if (zfd != -1) {
759	>	if (lseek(zfd, (long)y*scanlen(&tresolu)*sizeof(float),
760	>	0) < 0)
761	>	syserror("lseek");
762	>	if (read(zfd, (char *)zline,
763	>	scanlen(&tresolu)*sizeof(float))
764	>	< scanlen(&tresolu)*sizeof(float))
765	>	syserror("read");
766	>	}
767	>	xl[y].min = 32000; xl[y].max = 0;               /* x max */
768	>	for (x = scanlen(&tresolu); (x -= step) > 0; ) {
769	>	pix2loc(pos, &tresolu, x, y);
770	>	pos[2] = zline[x];
771	>	if (movepixel(pos) > FTINY) {
772	>	xl[y].max = x + step - 1;
773	>	xl[y].min = x - step + 1;       /* x min */
774	>	if (xl[y].min < 0)
775	>	xl[y].min = 0;
776	>	for (x = step - 1; x < xl[y].max; x += step) {
777	>	pix2loc(pos, &tresolu, x, y);
778	>	pos[2] = zline[x];
779	>	if (movepixel(pos) > FTINY) {
780	>	xl[y].min = x - step + 1;
781	>	break;
782	>	}
783	>	}
784	>	if (y < yl->min)                /* y limits */
785	>	yl->min = y - step + 1;
786	>	yl->max = y + step - 1;
787	>	break;
788		}
272	–	if (xblank > 0) {
273	–	copycolr(cfill, pscan(y)[xblank-1]);
274	–	for ( ; xblank < ourview.hresolu; xblank++)
275	–	copycolr(pscan(y)[xblank], cfill);
789		}
790	+	/* fill in between */
791	+	if (y < step) {
792	+	xl[y-1].min = xl[y].min;
793	+	xl[y-1].max = xl[y].max;
794	+	} else {
795	+	if (xl[y].min < xl[y-step].min)
796	+	xl[y-1].min = xl[y].min;
797	+	else
798	+	xl[y-1].min = xl[y-step].min;
799	+	if (xl[y].max > xl[y-step].max)
800	+	xl[y-1].max = xl[y].max;
801	+	else
802	+	xl[y-1].max = xl[y-step].max;
803	+	}
804	+	for (x = 2; x < step; x++)
805	+	copystruct(xl+y-x, xl+y-1);
806		}
807	+	if (yl->max >= numscans(&tresolu))
808	+	yl->max = numscans(&tresolu) - 1;
809	+	y -= step;
810	+	for (x = numscans(&tresolu) - 1; x > y; x--)    /* fill bottom rows */
811	+	copystruct(xl+x, xl+y);
812	+	return(yl->max >= yl->min);
813		}
814
815
816	<	writepicture()                          /* write out picture */
816	>	backpicture(fill, samp)                 /* background fill algorithm */
817	>	int     (*fill)();
818	>	int     samp;
819		{
820	+	int     *yback, xback;
821		int     y;
822	+	register int    x, i;
823	+	/* get back buffer */
824	+	yback = (int *)malloc(hresolu*sizeof(int));
825	+	if (yback == NULL)
826	+	syserror(progname);
827	+	for (x = 0; x < hresolu; x++)
828	+	yback[x] = -2;
829	+	/*
830	+	* Xback and yback are the pixel locations of suitable
831	+	* background values in each direction.
832	+	* A value of -2 means unassigned, and -1 means
833	+	* that there is no suitable background in this direction.
834	+	*/
835	+	/* fill image */
836	+	for (y = 0; y < vresolu; y++) {
837	+	xback = -2;
838	+	for (x = 0; x < hresolu; x++)
839	+	if (zscan(y)[x] <= 0) {         /* empty pixel */
840	+	/*
841	+	* First, find background from above or below.
842	+	* (farthest assigned pixel)
843	+	*/
844	+	if (yback[x] == -2) {
845	+	for (i = y+1; i < vresolu; i++)
846	+	if (zscan(i)[x] > 0)
847	+	break;
848	+	if (i < vresolu
849	+	&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
850	+	yback[x] = i;
851	+	else
852	+	yback[x] = y-1;
853	+	}
854	+	/*
855	+	* Next, find background from left or right.
856	+	*/
857	+	if (xback == -2) {
858	+	for (i = x+1; i < hresolu; i++)
859	+	if (zscan(y)[i] > 0)
860	+	break;
861	+	if (i < hresolu
862	+	&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
863	+	xback = i;
864	+	else
865	+	xback = x-1;
866	+	}
867	+	/*
868	+	* If we have no background for this pixel,
869	+	* use the given fill function.
870	+	*/
871	+	if (xback < 0 && yback[x] < 0)
872	+	goto fillit;
873	+	/*
874	+	* Compare, and use the background that is
875	+	* farther, unless one of them is next to us.
876	+	* If the background is too distant, call
877	+	* the fill function.
878	+	*/
879	+	if ( yback[x] < 0
880	+	|| (xback >= 0 && ABS(x-xback) <= 1)
881	+	|| ( ABS(y-yback[x]) > 1
882	+	&& zscan(yback[x])[x]
883	+	< zscan(y)[xback] ) ) {
884	+	if (samp > 0 && ABS(x-xback) >= samp)
885	+	goto fillit;
886	+	if (averaging) {
887	+	copycolor(sscan(y)[x],
888	+	sscan(y)[xback]);
889	+	wscan(y)[x] = wscan(y)[xback];
890	+	} else
891	+	copycolr(pscan(y)[x],
892	+	pscan(y)[xback]);
893	+	zscan(y)[x] = zscan(y)[xback];
894	+	} else {
895	+	if (samp > 0 && ABS(y-yback[x]) > samp)
896	+	goto fillit;
897	+	if (averaging) {
898	+	copycolor(sscan(y)[x],
899	+	sscan(yback[x])[x]);
900	+	wscan(y)[x] =
901	+	wscan(yback[x])[x];
902	+	} else
903	+	copycolr(pscan(y)[x],
904	+	pscan(yback[x])[x]);
905	+	zscan(y)[x] = zscan(yback[x])[x];
906	+	}
907	+	continue;
908	+	fillit:
909	+	(*fill)(x,y);
910	+	if (fill == rcalfill) {         /* use it */
911	+	clearqueue();
912	+	xback = x;
913	+	yback[x] = y;
914	+	}
915	+	} else {                                /* full pixel */
916	+	yback[x] = -2;
917	+	xback = -2;
918	+	}
919	+	}
920	+	free((char *)yback);
921	+	}
922
923	<	fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout);
924	<	for (y = ourview.vresolu-1; y >= 0; y--)
925	<	if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) {
926	<	perror(progname);
927	<	exit(1);
923	>
924	>	fillpicture(fill)               /* paint in empty pixels using fill */
925	>	int     (*fill)();
926	>	{
927	>	register int    x, y;
928	>
929	>	for (y = 0; y < vresolu; y++)
930	>	for (x = 0; x < hresolu; x++)
931	>	if (zscan(y)[x] <= 0)
932	>	(*fill)(x,y);
933	>	if (fill == rcalfill)
934	>	clearqueue();
935	>	}
936	>
937	>
938	>	clipaft()                       /* perform aft clipping as indicated */
939	>	{
940	>	register int    x, y;
941	>	int     adjtest = ourview.type == VT_PER & zisnorm;
942	>	double  tstdist;
943	>	double  yzn2, vx;
944	>
945	>	if (ourview.vaft <= FTINY)
946	>	return(0);
947	>	tstdist = ourview.vaft - ourview.vfore;
948	>	for (y = 0; y < vresolu; y++) {
949	>	if (adjtest) {                          /* adjust test */
950	>	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
951	>	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
952	>	tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
953		}
954	+	for (x = 0; x < hresolu; x++)
955	+	if (zscan(y)[x] > tstdist) {
956	+	if (adjtest) {
957	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
958	+	if (zscan(y)[x] <= (ourview.vaft -
959	+	ourview.vfore) *
960	+	sqrt(vx*vx*ourview.hn2 + yzn2))
961	+	continue;
962	+	}
963	+	if (averaging)
964	+	bzero(sscan(y)[x], sizeof(COLOR));
965	+	else
966	+	bzero(pscan(y)[x], sizeof(COLR));
967	+	zscan(y)[x] = 0.0;
968	+	}
969	+	}
970	+	return(1);
971	+	}
972	+
973	+
974	+	addblur()                               /* add to blurred picture */
975	+	{
976	+	COLOR   cval;
977	+	double  d;
978	+	register int    i;
979	+
980	+	if (!blurring)
981	+	return(0);
982	+	i = hresolu*vresolu;
983	+	if (nvavg < 2)
984	+	if (averaging)
985	+	while (i--) {
986	+	copycolor(ourbpict[i], ourspict[i]);
987	+	d = 1.0/ourweigh[i];
988	+	scalecolor(ourbpict[i], d);
989	+	}
990	+	else
991	+	while (i--)
992	+	colr_color(ourbpict[i], ourpict[i]);
993	+	else
994	+	if (averaging)
995	+	while (i--) {
996	+	copycolor(cval, ourspict[i]);
997	+	d = 1.0/ourweigh[i];
998	+	scalecolor(cval, d);
999	+	addcolor(ourbpict[i], cval);
1000	+	}
1001	+	else
1002	+	while (i--) {
1003	+	colr_color(cval, ourpict[i]);
1004	+	addcolor(ourbpict[i], cval);
1005	+	}
1006	+	/* print view */
1007	+	printf("VIEW%d:", nvavg);
1008	+	fprintview(&ourview, stdout);
1009	+	putchar('\n');
1010	+	return(1);
1011	+	}
1012	+
1013	+
1014	+	writepicture()                          /* write out picture (alters buffer) */
1015	+	{
1016	+	int     y;
1017	+	register int    x;
1018	+	double  d;
1019	+
1020	+	fprtresolu(hresolu, vresolu, stdout);
1021	+	for (y = vresolu-1; y >= 0; y--)
1022	+	if (blurring) {
1023	+	for (x = 0; x < hresolu; x++) { /* compute avg. */
1024	+	d = rexpadj/nvavg;
1025	+	scalecolor(bscan(y)[x], d);
1026	+	}
1027	+	if (fwritescan(bscan(y), hresolu, stdout) < 0)
1028	+	syserror(progname);
1029	+	} else if (averaging) {
1030	+	for (x = 0; x < hresolu; x++) { /* average pixels */
1031	+	d = rexpadj/wscan(y)[x];
1032	+	scalecolor(sscan(y)[x], d);
1033	+	}
1034	+	if (fwritescan(sscan(y), hresolu, stdout) < 0)
1035	+	syserror(progname);
1036	+	} else {
1037	+	if (expadj)
1038	+	shiftcolrs(pscan(y), hresolu, expadj);
1039	+	if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1040	+	syserror(progname);
1041	+	}
1042	+	}
1043	+
1044	+
1045	+	writedistance(fname)                    /* write out z file (alters buffer) */
1046	+	char    *fname;
1047	+	{
1048	+	int     donorm = normdist & !zisnorm ? 1 :
1049	+	ourview.type == VT_PER & !normdist & zisnorm ? -1 : 0;
1050	+	int     fd;
1051	+	int     y;
1052	+
1053	+	if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1054	+	syserror(fname);
1055	+	for (y = vresolu-1; y >= 0; y--) {
1056	+	if (donorm) {
1057	+	double  vx, yzn2, d;
1058	+	register int    x;
1059	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1060	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1061	+	for (x = 0; x < hresolu; x++) {
1062	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
1063	+	d = sqrt(vx*vx*ourview.hn2 + yzn2);
1064	+	if (donorm > 0)
1065	+	zscan(y)[x] *= d;
1066	+	else
1067	+	zscan(y)[x] /= d;
1068	+	}
1069	+	}
1070	+	if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1071	+	< hresolu*sizeof(float))
1072	+	syserror(fname);
1073	+	}
1074	+	close(fd);
1075	+	}
1076	+
1077	+
1078	+	backfill(x, y)                          /* fill pixel with background */
1079	+	int     x, y;
1080	+	{
1081	+	if (averaging) {
1082	+	copycolor(sscan(y)[x], backcolor);
1083	+	wscan(y)[x] = 1;
1084	+	} else
1085	+	copycolr(pscan(y)[x], backcolr);
1086	+	zscan(y)[x] = backz;
1087	+	}
1088	+
1089	+
1090	+	calstart(prog, args)                    /* start fill calculation */
1091	+	char    *prog, *args;
1092	+	{
1093	+	char    combuf[512];
1094	+	char    *argv[64];
1095	+	int     rval;
1096	+	register char   **wp, *cp;
1097	+
1098	+	if (childpid != -1) {
1099	+	fprintf(stderr, "%s: too many calculations\n", progname);
1100	+	exit(1);
1101	+	}
1102	+	strcpy(combuf, prog);
1103	+	strcat(combuf, args);
1104	+	cp = combuf;
1105	+	wp = argv;
1106	+	for ( ; ; ) {
1107	+	while (isspace(*cp))    /* nullify spaces */
1108	+	*cp++ = '\0';
1109	+	if (!*cp)               /* all done? */
1110	+	break;
1111	+	*wp++ = cp;             /* add argument to list */
1112	+	while (*++cp && !isspace(*cp))
1113	+	;
1114	+	}
1115	+	*wp = NULL;
1116	+	/* start process */
1117	+	if ((rval = open_process(PDesc, argv)) < 0)
1118	+	syserror(progname);
1119	+	if (rval == 0) {
1120	+	fprintf(stderr, "%s: command not found\n", argv[0]);
1121	+	exit(1);
1122	+	}
1123	+	packsiz = rval/(6*sizeof(float)) - 1;
1124	+	if (packsiz > PACKSIZ)
1125	+	packsiz = PACKSIZ;
1126	+	queuesiz = 0;
1127	+	}
1128	+
1129	+
1130	+	caldone()                               /* done with calculation */
1131	+	{
1132	+	if (childpid == -1)
1133	+	return;
1134	+	clearqueue();
1135	+	close_process(PDesc);
1136	+	childpid = -1;
1137	+	}
1138	+
1139	+
1140	+	rcalfill(x, y)                          /* fill with ray-calculated pixel */
1141	+	int     x, y;
1142	+	{
1143	+	if (queuesiz >= packsiz)        /* flush queue if needed */
1144	+	clearqueue();
1145	+	/* add position to queue */
1146	+	queue[queuesiz][0] = x;
1147	+	queue[queuesiz][1] = y;
1148	+	queuesiz++;
1149	+	}
1150	+
1151	+
1152	+	clearqueue()                            /* process queue */
1153	+	{
1154	+	FVECT   orig, dir;
1155	+	float   fbuf[6*(PACKSIZ+1)];
1156	+	register float  *fbp;
1157	+	register int    i;
1158	+	double  vx, vy;
1159	+
1160	+	if (queuesiz == 0)
1161	+	return;
1162	+	fbp = fbuf;
1163	+	for (i = 0; i < queuesiz; i++) {
1164	+	viewray(orig, dir, &ourview,
1165	+	(queue[i][0]+.5)/hresolu,
1166	+	(queue[i][1]+.5)/vresolu);
1167	+	*fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1168	+	*fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1169	+	}
1170	+	/* mark end and get results */
1171	+	bzero((char *)fbp, 6*sizeof(float));
1172	+	if (process(PDesc, fbuf, fbuf, 4*sizeof(float)*queuesiz,
1173	+	6*sizeof(float)*(queuesiz+1)) !=
1174	+	4*sizeof(float)*queuesiz) {
1175	+	fprintf(stderr, "%s: error reading from rtrace process\n",
1176	+	progname);
1177	+	exit(1);
1178	+	}
1179	+	fbp = fbuf;
1180	+	for (i = 0; i < queuesiz; i++) {
1181	+	if (ourexp > 0 && ourexp != 1.0) {
1182	+	fbp[0] *= ourexp;
1183	+	fbp[1] *= ourexp;
1184	+	fbp[2] *= ourexp;
1185	+	}
1186	+	if (averaging) {
1187	+	setcolor(sscan(queue[i][1])[queue[i][0]],
1188	+	fbp[0], fbp[1], fbp[2]);
1189	+	wscan(queue[i][1])[queue[i][0]] = 1;
1190	+	} else
1191	+	setcolr(pscan(queue[i][1])[queue[i][0]],
1192	+	fbp[0], fbp[1], fbp[2]);
1193	+	if (zisnorm)
1194	+	zscan(queue[i][1])[queue[i][0]] = fbp[3];
1195	+	else {
1196	+	vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1197	+	vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1198	+	zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1199	+	vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1200	+	}
1201	+	fbp += 4;
1202	+	}
1203	+	queuesiz = 0;
1204	+	}
1205	+
1206	+
1207	+	syserror(s)                     /* report error and exit */
1208	+	char    *s;
1209	+	{
1210	+	perror(s);
1211	+	exit(1);
1212		}

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