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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 2.26 by greg, Sat Sep 16 10:30:52 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	>	double  ourexp = -1;                    /* original picture exposure */
80	>	int     expadj = 0;                     /* exposure adjustment (f-stops) */
81	>	double  rexpadj = 1;                    /* real exposure adjustment */
82	>
83	>	VIEW    theirview;                      /* input view */
84		int     gotview;                        /* got input view? */
85	+	int     wrongformat = 0;                /* input in another format? */
86	+	RESOLU  tresolu;                        /* input resolution */
87	+	double  theirexp;                       /* input picture exposure */
88	+	MAT4    theirs2ours;                    /* transformation matrix */
89	+	int     hasmatrix = 0;                  /* has transformation matrix */
90
91	+	int     PDesc[3] = {-1,-1,-1};          /* rtrace process descriptor */
92	+	#define childpid        (PDesc[2])
93	+	unsigned short  queue[PACKSIZ][2];      /* pending pixels */
94	+	int     packsiz;                        /* actual packet size */
95	+	int     queuesiz = 0;                   /* number of pixels pending */
96
97	+	extern double   movepixel();
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 'v':                               /* view */
132	<	switch (argv[i][2]) {
133	<	case 't':                               /* type */
134	<	check(4,0);
135	<	ourview.type = argv[i][3];
131	>	case 'a':                               /* average */
132	>	check(2,NULL);
133	>	doavg = 1;
134	>	break;
135	>	case 'B':                               /* blur views */
136	>	check(2,NULL);
137	>	doblur = 1;
138	>	break;
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]);
59	<	ourview.vp[1] = atof(argv[++i]);
60	<	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]);
65	<	ourview.vdir[1] = atof(argv[++i]);
66	<	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]);
71	<	ourview.vup[1] = atof(argv[++i]);
72	<	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) {
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	<	}
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, 0, 0);
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",
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	>	/* set view */
254	>	if (nextview(doblur ? stdin : NULL) == EOF) {
255	>	fprintf(stderr, "%s: no view on standard input!\n",
256		progname);
257		exit(1);
258		}
259	<	/* set view */
111	<	if (err = setview(&ourview)) {
112	<	fprintf(stderr, "%s: %s\n", progname, err);
113	<	exit(1);
114	<	}
259	>	normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
260		/* allocate frame */
261	<	ourpict = (COLR *)calloc(ourview.hresolu*ourview.vresolu,sizeof(COLR));
262	<	ourzbuf = (float *)calloc(ourview.hresolu*ourview.vresolu,sizeof(float));
263	<	if (ourpict == NULL || ourzbuf == NULL) {
264	<	perror(progname);
265	<	exit(1);
261	>	if (doavg) {
262	>	ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
263	>	ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
264	>	if (ourspict == NULL | ourweigh == NULL)
265	>	syserror(progname);
266	>	} else {
267	>	ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
268	>	if (ourpict == NULL)
269	>	syserror(progname);
270		}
271	<	/* get input */
272	<	for ( ; i < argc; i += 2)
273	<	addpicture(argv[i], argv[i+1]);
274	<	/* fill in spaces */
275	<	fillpicture();
271	>	if (doblur) {
272	>	ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
273	>	if (ourbpict == NULL)
274	>	syserror(progname);
275	>	}
276	>	ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
277	>	if (ourzbuf == NULL)
278	>	syserror(progname);
279	>	/* new header */
280	>	newheader("RADIANCE", stdout);
281	>	/* run pictures */
282	>	do {
283	>	bzero((char *)ourzbuf, hresolu*vresolu*sizeof(float));
284	>	for (i = an; i < argc; i += 2)
285	>	addpicture(argv[i], argv[i+1]);
286	>	if (fillo&F_BACK)                       /* fill in spaces */
287	>	backpicture(fillfunc, fillsamp);
288	>	else
289	>	fillpicture(fillfunc);
290	>	/* aft clipping */
291	>	clipaft();
292	>	} while (addblur() && nextview(stdin) != EOF);
293	>	/* close calculation */
294	>	caldone();
295		/* add to header */
296		printargs(argc, argv, stdout);
297	<	if (gotvfile) {
298	<	printf(VIEWSTR);
299	<	fprintview(&ourview, stdout);
300	<	printf("\n");
297	>	compavgview();
298	>	if (doblur | gotvfile) {
299	>	fputs(VIEWSTR, stdout);
300	>	fprintview(&avgview, stdout);
301	>	putc('\n', stdout);
302		}
303	<	printf("\n");
304	<	/* write output */
303	>	if (pixaspect < .99 | pixaspect > 1.01)
304	>	fputaspect(pixaspect, stdout);
305	>	if (ourexp > 0)
306	>	ourexp *= rexpadj;
307	>	else
308	>	ourexp = rexpadj;
309	>	if (ourexp < .995 | ourexp > 1.005)
310	>	fputexpos(ourexp, stdout);
311	>	fputformat(COLRFMT, stdout);
312	>	putc('\n', stdout);
313	>	/* write picture */
314		writepicture();
315	+	/* write z file */
316	+	if (zfile != NULL)
317	+	writedistance(zfile);
318
319		exit(0);
320	+	userr:
321	+	fprintf(stderr,
322	+	"Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
323	+	progname);
324	+	exit(1);
325		#undef check
326		}
327
#	Line 143 | Line 329 | char   *argv[];
329		headline(s)                             /* process header string */
330		char    *s;
331		{
332	<	static char     *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL};
147	<	register char   **an;
332	>	char    fmt[32];
333
334	<	printf("\t%s", s);
335	<
336	<	for (an = altname; *an != NULL; an++)
337	<	if (!strncmp(*an, s, strlen(*an))) {
338	<	if (sscanview(&theirview, s+strlen(*an)) == 0)
339	<	gotview++;
340	<	break;
341	<	}
334	>	if (isheadid(s))
335	>	return;
336	>	if (formatval(fmt, s)) {
337	>	wrongformat = strcmp(fmt, COLRFMT);
338	>	return;
339	>	}
340	>	if (nvavg < 2) {
341	>	putc('\t', stdout);
342	>	fputs(s, stdout);
343	>	}
344	>	if (isexpos(s)) {
345	>	theirexp *= exposval(s);
346	>	return;
347	>	}
348	>	if (isview(s) && sscanview(&theirview, s) > 0)
349	>	gotview++;
350		}
351
352
353	<	addpicture(pfile, zfile)                /* add picture to output */
354	<	char    *pfile, *zfile;
353	>	nextview(fp)                            /* get and set next view */
354	>	FILE    *fp;
355		{
356	<	FILE    *pfp, *zfp;
164	<	COLR    *scanin;
165	<	float   *zin;
356	>	char    linebuf[256];
357		char    *err;
358	<	int     xres, yres;
359	<	int     y;
360	<	/* open input files */
361	<	if ((pfp = fopen(pfile, "r")) == NULL) {
362	<	perror(pfile);
363	<	exit(1);
358	>	register int    i;
359	>
360	>	if (fp != NULL) {
361	>	do                      /* get new view */
362	>	if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
363	>	return(EOF);
364	>	while (!isview(linebuf) || !sscanview(&ourview, linebuf));
365		}
366	<	if ((zfp = fopen(zfile, "r")) == NULL) {
367	<	perror(zfile);
366	>	/* set new view */
367	>	if ((err = setview(&ourview)) != NULL) {
368	>	fprintf(stderr, "%s: %s\n", progname, err);
369		exit(1);
370		}
371	<	/* get header and view */
372	<	printf("%s:\n", pfile);
371	>	if (!nvavg) {                   /* first view */
372	>	copystruct(&avgview, &ourview);
373	>	return(nvavg++);
374	>	}
375	>	/* add to average view */
376	>	for (i = 0; i < 3; i++) {
377	>	avgview.vp[i] += ourview.vp[i];
378	>	avgview.vdir[i] += ourview.vdir[i];
379	>	avgview.vup[i] += ourview.vup[i];
380	>	}
381	>	avgview.horiz += ourview.horiz;
382	>	avgview.vert += ourview.vert;
383	>	avgview.hoff += ourview.hoff;
384	>	avgview.voff += ourview.voff;
385	>	avgview.vfore += ourview.vfore;
386	>	avgview.vaft += ourview.vaft;
387	>	return(nvavg++);
388	>	}
389	>
390	>
391	>	compavgview()                           /* compute average view */
392	>	{
393	>	register int    i;
394	>	double  f;
395	>
396	>	if (nvavg < 2)
397	>	return;
398	>	f = 1.0/nvavg;
399	>	for (i = 0; i < 3; i++) {
400	>	avgview.vp[i] *= f;
401	>	avgview.vdir[i] *= f;
402	>	avgview.vup[i] *= f;
403	>	}
404	>	avgview.horiz *= f;
405	>	avgview.vert *= f;
406	>	avgview.hoff *= f;
407	>	avgview.voff *= f;
408	>	avgview.vfore *= f;
409	>	avgview.vaft *= f;
410	>	if (setview(&avgview) != NULL)          /* in case of emergency... */
411	>	copystruct(&avgview, &ourview);
412	>	pixaspect = viewaspect(&avgview) * hresolu / vresolu;
413	>	}
414	>
415	>
416	>	addpicture(pfile, zspec)                /* add picture to output */
417	>	char    *pfile, *zspec;
418	>	{
419	>	FILE    *pfp;
420	>	int     zfd;
421	>	char    *err;
422	>	COLR    *scanin;
423	>	float   *zin;
424	>	struct position *plast;
425	>	struct bound    *xlim, ylim;
426	>	int     y;
427	>	/* open picture file */
428	>	if ((pfp = fopen(pfile, "r")) == NULL)
429	>	syserror(pfile);
430	>	/* get header with exposure and view */
431	>	theirexp = 1.0;
432	>	copystruct(&theirview, &stdview);
433		gotview = 0;
434	<	getheader(pfp, headline);
435	<	if (!gotview || fgetresolu(&xres, &yres, pfp) != (YMAJOR|YDECR)) {
436	<	fprintf(stderr, "%s: picture view error\n", pfile);
434	>	if (nvavg < 2)
435	>	printf("%s:\n", pfile);
436	>	getheader(pfp, headline, NULL);
437	>	if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
438	>	fprintf(stderr, "%s: picture format error\n", pfile);
439		exit(1);
440		}
441	<	theirview.hresolu = xres;
442	<	theirview.vresolu = yres;
441	>	if (ourexp <= 0)
442	>	ourexp = theirexp;
443	>	else if (ABS(theirexp-ourexp) > .01*ourexp)
444	>	fprintf(stderr, "%s: different exposure (warning)\n", pfile);
445		if (err = setview(&theirview)) {
446		fprintf(stderr, "%s: %s\n", pfile, err);
447		exit(1);
448		}
449	<	/* allocate scanlines */
450	<	scanin = (COLR *)malloc(xres*sizeof(COLR));
451	<	zin = (float *)malloc(xres*sizeof(float));
452	<	if (scanin == NULL || zin == NULL) {
453	<	perror(progname);
454	<	exit(1);
449	>	/* compute transformation */
450	>	hasmatrix = pixform(theirs2ours, &theirview, &ourview);
451	>	/* get z specification or file */
452	>	zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
453	>	if (zin == NULL)
454	>	syserror(progname);
455	>	if ((zfd = open(zspec, O_RDONLY)) == -1) {
456	>	double  zvalue;
457	>	register int    x;
458	>	if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
459	>	syserror(zspec);
460	>	for (x = scanlen(&tresolu); x-- > 0; )
461	>	zin[x] = zvalue;
462		}
463	<	/* load image */
464	<	for (y = yres-1; y >= 0; y--) {
465	<	if (freadcolrs(scanin, xres, pfp) < 0) {
463	>	/* compute transferrable perimeter */
464	>	xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
465	>	if (xlim == NULL)
466	>	syserror(progname);
467	>	if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
468	>	free((char *)zin);
469	>	free((char *)xlim);
470	>	if (zfd != -1)
471	>	close(zfd);
472	>	fclose(pfp);
473	>	return;
474	>	}
475	>	/* allocate scanlines */
476	>	scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
477	>	plast = (struct position *)calloc(scanlen(&tresolu),
478	>	sizeof(struct position));
479	>	if (scanin == NULL | plast == NULL)
480	>	syserror(progname);
481	>	/* skip to starting point */
482	>	for (y = 0; y < ylim.min; y++)
483	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
484		fprintf(stderr, "%s: read error\n", pfile);
485		exit(1);
486		}
487	<	if (fread(zin, sizeof(float), xres, zfp) < xres) {
488	<	fprintf(stderr, "%s: read error\n", zfile);
487	>	if (zfd != -1 && lseek(zfd,
488	>	(long)ylim.min*scanlen(&tresolu)*sizeof(float), 0) < 0)
489	>	syserror(zspec);
490	>	/* load image */
491	>	for (y = ylim.min; y <= ylim.max; y++) {
492	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
493	>	fprintf(stderr, "%s: read error\n", pfile);
494		exit(1);
495		}
496	<	addscanline(y, scanin, zin);
496	>	if (zfd != -1 && read(zfd, (char *)zin,
497	>	scanlen(&tresolu)*sizeof(float))
498	>	< scanlen(&tresolu)*sizeof(float))
499	>	syserror(zspec);
500	>	addscanline(xlim+y, y, scanin, zin, plast);
501		}
502		/* clean up */
503	+	free((char *)xlim);
504		free((char *)scanin);
505		free((char *)zin);
506	+	free((char *)plast);
507		fclose(pfp);
508	<	fclose(zfp);
508	>	if (zfd != -1)
509	>	close(zfd);
510		}
511
512
513	<	addscanline(y, pline, zline)            /* add scanline to output */
513	>	pixform(xfmat, vw1, vw2)                /* compute view1 to view2 matrix */
514	>	register MAT4   xfmat;
515	>	register VIEW   *vw1, *vw2;
516	>	{
517	>	double  m4t[4][4];
518	>
519	>	if (vw1->type != VT_PER & vw1->type != VT_PAR)
520	>	return(0);
521	>	if (vw2->type != VT_PER & vw2->type != VT_PAR)
522	>	return(0);
523	>	setident4(xfmat);
524	>	xfmat[0][0] = vw1->hvec[0];
525	>	xfmat[0][1] = vw1->hvec[1];
526	>	xfmat[0][2] = vw1->hvec[2];
527	>	xfmat[1][0] = vw1->vvec[0];
528	>	xfmat[1][1] = vw1->vvec[1];
529	>	xfmat[1][2] = vw1->vvec[2];
530	>	xfmat[2][0] = vw1->vdir[0];
531	>	xfmat[2][1] = vw1->vdir[1];
532	>	xfmat[2][2] = vw1->vdir[2];
533	>	xfmat[3][0] = vw1->vp[0];
534	>	xfmat[3][1] = vw1->vp[1];
535	>	xfmat[3][2] = vw1->vp[2];
536	>	setident4(m4t);
537	>	m4t[0][0] = vw2->hvec[0]/vw2->hn2;
538	>	m4t[1][0] = vw2->hvec[1]/vw2->hn2;
539	>	m4t[2][0] = vw2->hvec[2]/vw2->hn2;
540	>	m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
541	>	m4t[0][1] = vw2->vvec[0]/vw2->vn2;
542	>	m4t[1][1] = vw2->vvec[1]/vw2->vn2;
543	>	m4t[2][1] = vw2->vvec[2]/vw2->vn2;
544	>	m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
545	>	m4t[0][2] = vw2->vdir[0];
546	>	m4t[1][2] = vw2->vdir[1];
547	>	m4t[2][2] = vw2->vdir[2];
548	>	m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
549	>	multmat4(xfmat, xfmat, m4t);
550	>	return(1);
551	>	}
552	>
553	>
554	>	addscanline(xl, y, pline, zline, lasty) /* add scanline to output */
555	>	struct bound    *xl;
556		int     y;
557		COLR    *pline;
558		float   *zline;
559	+	struct position *lasty;         /* input/output */
560		{
561	<	FVECT   p, dir;
562	<	double  xnew, ynew, znew;
561	>	FVECT   pos;
562	>	struct position lastx, newpos;
563	>	double  wt;
564		register int    x;
227	–	register int    xpos, ypos;
565
566	<	for (x = 0; x < theirview.hresolu; x++) {
567	<	rayview(p, dir, &theirview, x+.5, y+.5);
568	<	p[0] += zline[x]*dir[0];
569	<	p[1] += zline[x]*dir[1];
570	<	p[2] += zline[x]*dir[2];
571	<	pixelview(&xnew, &ynew, &znew, &ourview, p);
235	<	if (znew <= 0.0 || xnew < 0 || xnew > ourview.hresolu
236	<	|| ynew < 0 || ynew > ourview.vresolu)
566	>	lastx.z = 0;
567	>	for (x = xl->max; x >= xl->min; x--) {
568	>	pix2loc(pos, &tresolu, x, y);
569	>	pos[2] = zline[x];
570	>	if ((wt = movepixel(pos)) <= FTINY) {
571	>	lasty[x].z = lastx.z = 0;       /* mark invalid */
572		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]);
573		}
574	+	/* add pixel to our image */
575	+	newpos.x = pos[0] * hresolu;
576	+	newpos.y = pos[1] * vresolu;
577	+	newpos.z = zline[x];
578	+	addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
579	+	lasty[x].x = lastx.x = newpos.x;
580	+	lasty[x].y = lastx.y = newpos.y;
581	+	lasty[x].z = lastx.z = newpos.z;
582		}
583		}
584
585
586	<	fillpicture()                           /* fill in empty spaces */
586	>	addpixel(p0, p1, p2, pix, w, z)         /* fill in pixel parallelogram */
587	>	struct position *p0, *p1, *p2;
588	>	COLR    pix;
589	>	double  w;
590	>	double  z;
591		{
592	<	int     y;
593	<	COLR    cfill;
594	<	register int    x, xblank;
592	>	double  zt = 2.*zeps*p0->z;             /* threshold */
593	>	COLOR   pval;                           /* converted+weighted pixel */
594	>	int     s1x, s1y, s2x, s2y;             /* step sizes */
595	>	int     l1, l2, c1, c2;                 /* side lengths and counters */
596	>	int     p1isy;                          /* p0p1 along y? */
597	>	int     x1, y1;                         /* p1 position */
598	>	register int    x, y;                   /* final position */
599	>
600	>	/* compute vector p0p1 */
601	>	if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
602	>	s1x = p1->x - p0->x;
603	>	s1y = p1->y - p0->y;
604	>	l1 = ABS(s1x);
605	>	if (p1isy = (ABS(s1y) > l1))
606	>	l1 = ABS(s1y);
607	>	else if (l1 < 1)
608	>	l1 = 1;
609	>	} else {
610	>	l1 = s1x = s1y = 1;
611	>	p1isy = -1;
612	>	}
613	>	/* compute vector p0p2 */
614	>	if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
615	>	s2x = p2->x - p0->x;
616	>	s2y = p2->y - p0->y;
617	>	if (p1isy == 1)
618	>	l2 = ABS(s2x);
619	>	else {
620	>	l2 = ABS(s2y);
621	>	if (p1isy != 0 && ABS(s2x) > l2)
622	>	l2 = ABS(s2x);
623	>	}
624	>	if (l2 < 1)
625	>	l2 = 1;
626	>	} else
627	>	l2 = s2x = s2y = 1;
628	>	/* fill the parallelogram */
629	>	if (averaging) {
630	>	colr_color(pval, pix);
631	>	scalecolor(pval, w);
632	>	}
633	>	for (c1 = l1; c1-- > 0; ) {
634	>	x1 = p0->x + c1*s1x/l1;
635	>	y1 = p0->y + c1*s1y/l1;
636	>	for (c2 = l2; c2-- > 0; ) {
637	>	x = x1 + c2*s2x/l2;
638	>	if (x < 0 | x >= hresolu)
639	>	continue;
640	>	y = y1 + c2*s2y/l2;
641	>	if (y < 0 | y >= vresolu)
642	>	continue;
643	>	if (averaging) {
644	>	if (zscan(y)[x] <= 0 || zscan(y)[x]-z
645	>	> zeps*zscan(y)[x]) {
646	>	copycolor(sscan(y)[x], pval);
647	>	wscan(y)[x] = w;
648	>	zscan(y)[x] = z;
649	>	} else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
650	>	addcolor(sscan(y)[x], pval);
651	>	wscan(y)[x] += w;
652	>	}
653	>	} else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
654	>	> zeps*zscan(y)[x]) {
655	>	copycolr(pscan(y)[x], pix);
656	>	zscan(y)[x] = z;
657	>	}
658	>	}
659	>	}
660	>	}
661	>
662	>
663	>	double
664	>	movepixel(pos)                          /* reposition image point */
665	>	register FVECT  pos;
666	>	{
667	>	FVECT   pt, tdir, odir;
668	>	double  d;
669	>	register int    i;
670
671	<	for (y = 0; y < ourview.vresolu; y++) {
672	<	xblank = -1;
673	<	for (x = 0; x < ourview.hresolu; x++)
674	<	if (zscan(y)[x] <= 0.0) {
675	<	if (xblank < 0)
676	<	xblank = x;
677	<	} else if (xblank >= 0) {
678	<	if (xblank == 0 || zscan(y)[xblank-1] < zscan(y)[x])
679	<	copycolr(cfill, pscan(y)[x]);
680	<	else
681	<	copycolr(cfill, pscan(y)[xblank-1]);
682	<	for ( ; xblank < x; xblank++)
683	<	copycolr(pscan(y)[xblank], cfill);
684	<	xblank = -1;
671	>	if (pos[2] <= 0)                /* empty pixel */
672	>	return(0);
673	>	if (usematrix) {
674	>	pos[0] += theirview.hoff - .5;
675	>	pos[1] += theirview.voff - .5;
676	>	if (normdist & theirview.type == VT_PER)
677	>	d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
678	>	+ pos[1]*pos[1]*theirview.vn2);
679	>	else
680	>	d = 1.;
681	>	pos[2] += d*theirview.vfore;
682	>	if (theirview.type == VT_PER) {
683	>	pos[2] /= d;
684	>	pos[0] *= pos[2];
685	>	pos[1] *= pos[2];
686	>	}
687	>	multp3(pos, pos, theirs2ours);
688	>	if (pos[2] <= ourview.vfore)
689	>	return(0);
690	>	if (ourview.type == VT_PER) {
691	>	pos[0] /= pos[2];
692	>	pos[1] /= pos[2];
693	>	}
694	>	pos[0] += .5 - ourview.hoff;
695	>	pos[1] += .5 - ourview.voff;
696	>	pos[2] -= ourview.vfore;
697	>	} else {
698	>	if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
699	>	return(0);
700	>	if (!normdist & theirview.type == VT_PER)       /* adjust */
701	>	pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
702	>	+ pos[1]*pos[1]*theirview.vn2);
703	>	pt[0] += tdir[0]*pos[2];
704	>	pt[1] += tdir[1]*pos[2];
705	>	pt[2] += tdir[2]*pos[2];
706	>	viewloc(pos, &ourview, pt);
707	>	if (pos[2] <= 0)
708	>	return(0);
709	>	}
710	>	if (pos[0] < 0 | pos[0] >= 1-FTINY | pos[1] < 0 | pos[1] >= 1-FTINY)
711	>	return(0);
712	>	if (!averaging)
713	>	return(1);
714	>	if (ourview.type == VT_PAR)             /* compute our direction */
715	>	VCOPY(odir, ourview.vdir);
716	>	else
717	>	for (i = 0; i < 3; i++)
718	>	odir[i] = (pt[i] - ourview.vp[i])/pos[2];
719	>	d = DOT(odir,tdir);                     /* compute pixel weight */
720	>	if (d >= 1.-1./MAXWT/MAXWT)
721	>	return(MAXWT);          /* clip to maximum weight */
722	>	return(1./sqrt(1.-d));
723	>	}
724	>
725	>
726	>	getperim(xl, yl, zline, zfd)            /* compute overlapping image area */
727	>	register struct bound   *xl;
728	>	struct bound    *yl;
729	>	float   *zline;
730	>	int     zfd;
731	>	{
732	>	int     step;
733	>	FVECT   pos;
734	>	register int    x, y;
735	>	/* set up step size */
736	>	if (scanlen(&tresolu) < numscans(&tresolu))
737	>	step = scanlen(&tresolu)/NSTEPS;
738	>	else
739	>	step = numscans(&tresolu)/NSTEPS;
740	>	if (step < MINSTEP) {                   /* not worth cropping? */
741	>	yl->min = 0;
742	>	yl->max = numscans(&tresolu) - 1;
743	>	x = scanlen(&tresolu) - 1;
744	>	for (y = numscans(&tresolu); y--; ) {
745	>	xl[y].min = 0;
746	>	xl[y].max = x;
747	>	}
748	>	return(1);
749	>	}
750	>	yl->min = 32000; yl->max = 0;           /* search for points on image */
751	>	for (y = step - 1; y < numscans(&tresolu); y += step) {
752	>	if (zfd != -1) {
753	>	if (lseek(zfd, (long)y*scanlen(&tresolu)*sizeof(float),
754	>	0) < 0)
755	>	syserror("lseek");
756	>	if (read(zfd, (char *)zline,
757	>	scanlen(&tresolu)*sizeof(float))
758	>	< scanlen(&tresolu)*sizeof(float))
759	>	syserror("read");
760	>	}
761	>	xl[y].min = 32000; xl[y].max = 0;               /* x max */
762	>	for (x = scanlen(&tresolu); (x -= step) > 0; ) {
763	>	pix2loc(pos, &tresolu, x, y);
764	>	pos[2] = zline[x];
765	>	if (movepixel(pos) > FTINY) {
766	>	xl[y].max = x + step - 1;
767	>	xl[y].min = x - step + 1;       /* x min */
768	>	if (xl[y].min < 0)
769	>	xl[y].min = 0;
770	>	for (x = step - 1; x < xl[y].max; x += step) {
771	>	pix2loc(pos, &tresolu, x, y);
772	>	pos[2] = zline[x];
773	>	if (movepixel(pos) > FTINY) {
774	>	xl[y].min = x - step + 1;
775	>	break;
776	>	}
777	>	}
778	>	if (y < yl->min)                /* y limits */
779	>	yl->min = y - step + 1;
780	>	yl->max = y + step - 1;
781	>	break;
782		}
272	–	if (xblank > 0) {
273	–	copycolr(cfill, pscan(y)[xblank-1]);
274	–	for ( ; xblank < ourview.hresolu; xblank++)
275	–	copycolr(pscan(y)[xblank], cfill);
783		}
784	+	/* fill in between */
785	+	if (y < step) {
786	+	xl[y-1].min = xl[y].min;
787	+	xl[y-1].max = xl[y].max;
788	+	} else {
789	+	if (xl[y].min < xl[y-step].min)
790	+	xl[y-1].min = xl[y].min;
791	+	else
792	+	xl[y-1].min = xl[y-step].min;
793	+	if (xl[y].max > xl[y-step].max)
794	+	xl[y-1].max = xl[y].max;
795	+	else
796	+	xl[y-1].max = xl[y-step].max;
797	+	}
798	+	for (x = 2; x < step; x++)
799	+	copystruct(xl+y-x, xl+y-1);
800		}
801	+	if (yl->max >= numscans(&tresolu))
802	+	yl->max = numscans(&tresolu) - 1;
803	+	y -= step;
804	+	for (x = numscans(&tresolu) - 1; x > y; x--)    /* fill bottom rows */
805	+	copystruct(xl+x, xl+y);
806	+	return(yl->max >= yl->min);
807		}
808
809
810	<	writepicture()                          /* write out picture */
810	>	backpicture(fill, samp)                 /* background fill algorithm */
811	>	int     (*fill)();
812	>	int     samp;
813		{
814	+	int     *yback, xback;
815		int     y;
816	+	register int    x, i;
817	+	/* get back buffer */
818	+	yback = (int *)malloc(hresolu*sizeof(int));
819	+	if (yback == NULL)
820	+	syserror(progname);
821	+	for (x = 0; x < hresolu; x++)
822	+	yback[x] = -2;
823	+	/*
824	+	* Xback and yback are the pixel locations of suitable
825	+	* background values in each direction.
826	+	* A value of -2 means unassigned, and -1 means
827	+	* that there is no suitable background in this direction.
828	+	*/
829	+	/* fill image */
830	+	for (y = 0; y < vresolu; y++) {
831	+	xback = -2;
832	+	for (x = 0; x < hresolu; x++)
833	+	if (zscan(y)[x] <= 0) {         /* empty pixel */
834	+	/*
835	+	* First, find background from above or below.
836	+	* (farthest assigned pixel)
837	+	*/
838	+	if (yback[x] == -2) {
839	+	for (i = y+1; i < vresolu; i++)
840	+	if (zscan(i)[x] > 0)
841	+	break;
842	+	if (i < vresolu
843	+	&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
844	+	yback[x] = i;
845	+	else
846	+	yback[x] = y-1;
847	+	}
848	+	/*
849	+	* Next, find background from left or right.
850	+	*/
851	+	if (xback == -2) {
852	+	for (i = x+1; i < hresolu; i++)
853	+	if (zscan(y)[i] > 0)
854	+	break;
855	+	if (i < hresolu
856	+	&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
857	+	xback = i;
858	+	else
859	+	xback = x-1;
860	+	}
861	+	/*
862	+	* If we have no background for this pixel,
863	+	* use the given fill function.
864	+	*/
865	+	if (xback < 0 && yback[x] < 0)
866	+	goto fillit;
867	+	/*
868	+	* Compare, and use the background that is
869	+	* farther, unless one of them is next to us.
870	+	* If the background is too distant, call
871	+	* the fill function.
872	+	*/
873	+	if ( yback[x] < 0
874	+	|| (xback >= 0 && ABS(x-xback) <= 1)
875	+	|| ( ABS(y-yback[x]) > 1
876	+	&& zscan(yback[x])[x]
877	+	< zscan(y)[xback] ) ) {
878	+	if (samp > 0 && ABS(x-xback) >= samp)
879	+	goto fillit;
880	+	if (averaging) {
881	+	copycolor(sscan(y)[x],
882	+	sscan(y)[xback]);
883	+	wscan(y)[x] = wscan(y)[xback];
884	+	} else
885	+	copycolr(pscan(y)[x],
886	+	pscan(y)[xback]);
887	+	zscan(y)[x] = zscan(y)[xback];
888	+	} else {
889	+	if (samp > 0 && ABS(y-yback[x]) > samp)
890	+	goto fillit;
891	+	if (averaging) {
892	+	copycolor(sscan(y)[x],
893	+	sscan(yback[x])[x]);
894	+	wscan(y)[x] =
895	+	wscan(yback[x])[x];
896	+	} else
897	+	copycolr(pscan(y)[x],
898	+	pscan(yback[x])[x]);
899	+	zscan(y)[x] = zscan(yback[x])[x];
900	+	}
901	+	continue;
902	+	fillit:
903	+	(*fill)(x,y);
904	+	if (fill == rcalfill) {         /* use it */
905	+	clearqueue();
906	+	xback = x;
907	+	yback[x] = y;
908	+	}
909	+	} else {                                /* full pixel */
910	+	yback[x] = -2;
911	+	xback = -2;
912	+	}
913	+	}
914	+	free((char *)yback);
915	+	}
916
917	<	fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout);
918	<	for (y = ourview.vresolu-1; y >= 0; y--)
919	<	if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) {
920	<	perror(progname);
921	<	exit(1);
917	>
918	>	fillpicture(fill)               /* paint in empty pixels using fill */
919	>	int     (*fill)();
920	>	{
921	>	register int    x, y;
922	>
923	>	for (y = 0; y < vresolu; y++)
924	>	for (x = 0; x < hresolu; x++)
925	>	if (zscan(y)[x] <= 0)
926	>	(*fill)(x,y);
927	>	if (fill == rcalfill)
928	>	clearqueue();
929	>	}
930	>
931	>
932	>	clipaft()                       /* perform aft clipping as indicated */
933	>	{
934	>	register int    x, y;
935	>	int     adjtest = ourview.type == VT_PER & zisnorm;
936	>	double  tstdist;
937	>	double  yzn2, vx;
938	>
939	>	if (ourview.vaft <= FTINY)
940	>	return(0);
941	>	tstdist = ourview.vaft - ourview.vfore;
942	>	for (y = 0; y < vresolu; y++) {
943	>	if (adjtest) {                          /* adjust test */
944	>	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
945	>	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
946	>	tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
947		}
948	+	for (x = 0; x < hresolu; x++)
949	+	if (zscan(y)[x] > tstdist) {
950	+	if (adjtest) {
951	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
952	+	if (zscan(y)[x] <= (ourview.vaft -
953	+	ourview.vfore) *
954	+	sqrt(vx*vx*ourview.hn2 + yzn2))
955	+	continue;
956	+	}
957	+	if (averaging)
958	+	bzero(sscan(y)[x], sizeof(COLOR));
959	+	else
960	+	bzero(pscan(y)[x], sizeof(COLR));
961	+	zscan(y)[x] = 0.0;
962	+	}
963	+	}
964	+	return(1);
965	+	}
966	+
967	+
968	+	addblur()                               /* add to blurred picture */
969	+	{
970	+	COLOR   cval;
971	+	double  d;
972	+	register int    i;
973	+
974	+	if (!blurring)
975	+	return(0);
976	+	i = hresolu*vresolu;
977	+	if (nvavg < 2)
978	+	if (averaging)
979	+	while (i--) {
980	+	copycolor(ourbpict[i], ourspict[i]);
981	+	d = 1.0/ourweigh[i];
982	+	scalecolor(ourbpict[i], d);
983	+	}
984	+	else
985	+	while (i--)
986	+	colr_color(ourbpict[i], ourpict[i]);
987	+	else
988	+	if (averaging)
989	+	while (i--) {
990	+	copycolor(cval, ourspict[i]);
991	+	d = 1.0/ourweigh[i];
992	+	scalecolor(cval, d);
993	+	addcolor(ourbpict[i], cval);
994	+	}
995	+	else
996	+	while (i--) {
997	+	colr_color(cval, ourpict[i]);
998	+	addcolor(ourbpict[i], cval);
999	+	}
1000	+	/* print view */
1001	+	printf("VIEW%d:", nvavg);
1002	+	fprintview(&ourview, stdout);
1003	+	putchar('\n');
1004	+	return(1);
1005	+	}
1006	+
1007	+
1008	+	writepicture()                          /* write out picture (alters buffer) */
1009	+	{
1010	+	int     y;
1011	+	register int    x;
1012	+	double  d;
1013	+
1014	+	fprtresolu(hresolu, vresolu, stdout);
1015	+	for (y = vresolu-1; y >= 0; y--)
1016	+	if (blurring) {
1017	+	for (x = 0; x < hresolu; x++) { /* compute avg. */
1018	+	d = rexpadj/nvavg;
1019	+	scalecolor(bscan(y)[x], d);
1020	+	}
1021	+	if (fwritescan(bscan(y), hresolu, stdout) < 0)
1022	+	syserror(progname);
1023	+	} else if (averaging) {
1024	+	for (x = 0; x < hresolu; x++) { /* average pixels */
1025	+	d = rexpadj/wscan(y)[x];
1026	+	scalecolor(sscan(y)[x], d);
1027	+	}
1028	+	if (fwritescan(sscan(y), hresolu, stdout) < 0)
1029	+	syserror(progname);
1030	+	} else {
1031	+	if (expadj)
1032	+	shiftcolrs(pscan(y), hresolu, expadj);
1033	+	if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1034	+	syserror(progname);
1035	+	}
1036	+	}
1037	+
1038	+
1039	+	writedistance(fname)                    /* write out z file (alters buffer) */
1040	+	char    *fname;
1041	+	{
1042	+	int     donorm = normdist & !zisnorm ? 1 :
1043	+	ourview.type == VT_PER & !normdist & zisnorm ? -1 : 0;
1044	+	int     fd;
1045	+	int     y;
1046	+
1047	+	if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1048	+	syserror(fname);
1049	+	for (y = vresolu-1; y >= 0; y--) {
1050	+	if (donorm) {
1051	+	double  vx, yzn2, d;
1052	+	register int    x;
1053	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1054	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1055	+	for (x = 0; x < hresolu; x++) {
1056	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
1057	+	d = sqrt(vx*vx*ourview.hn2 + yzn2);
1058	+	if (donorm > 0)
1059	+	zscan(y)[x] *= d;
1060	+	else
1061	+	zscan(y)[x] /= d;
1062	+	}
1063	+	}
1064	+	if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1065	+	< hresolu*sizeof(float))
1066	+	syserror(fname);
1067	+	}
1068	+	close(fd);
1069	+	}
1070	+
1071	+
1072	+	backfill(x, y)                          /* fill pixel with background */
1073	+	int     x, y;
1074	+	{
1075	+	if (averaging) {
1076	+	copycolor(sscan(y)[x], backcolor);
1077	+	wscan(y)[x] = 1;
1078	+	} else
1079	+	copycolr(pscan(y)[x], backcolr);
1080	+	zscan(y)[x] = backz;
1081	+	}
1082	+
1083	+
1084	+	calstart(prog, args)                    /* start fill calculation */
1085	+	char    *prog, *args;
1086	+	{
1087	+	char    combuf[512];
1088	+	char    *argv[64];
1089	+	int     rval;
1090	+	register char   **wp, *cp;
1091	+
1092	+	if (childpid != -1) {
1093	+	fprintf(stderr, "%s: too many calculations\n", progname);
1094	+	exit(1);
1095	+	}
1096	+	strcpy(combuf, prog);
1097	+	strcat(combuf, args);
1098	+	cp = combuf;
1099	+	wp = argv;
1100	+	for ( ; ; ) {
1101	+	while (isspace(*cp))    /* nullify spaces */
1102	+	*cp++ = '\0';
1103	+	if (!*cp)               /* all done? */
1104	+	break;
1105	+	*wp++ = cp;             /* add argument to list */
1106	+	while (*++cp && !isspace(*cp))
1107	+	;
1108	+	}
1109	+	*wp = NULL;
1110	+	/* start process */
1111	+	if ((rval = open_process(PDesc, argv)) < 0)
1112	+	syserror(progname);
1113	+	if (rval == 0) {
1114	+	fprintf(stderr, "%s: command not found\n", argv[0]);
1115	+	exit(1);
1116	+	}
1117	+	packsiz = rval/(6*sizeof(float)) - 1;
1118	+	if (packsiz > PACKSIZ)
1119	+	packsiz = PACKSIZ;
1120	+	queuesiz = 0;
1121	+	}
1122	+
1123	+
1124	+	caldone()                               /* done with calculation */
1125	+	{
1126	+	if (childpid == -1)
1127	+	return;
1128	+	clearqueue();
1129	+	close_process(PDesc);
1130	+	childpid = -1;
1131	+	}
1132	+
1133	+
1134	+	rcalfill(x, y)                          /* fill with ray-calculated pixel */
1135	+	int     x, y;
1136	+	{
1137	+	if (queuesiz >= packsiz)        /* flush queue if needed */
1138	+	clearqueue();
1139	+	/* add position to queue */
1140	+	queue[queuesiz][0] = x;
1141	+	queue[queuesiz][1] = y;
1142	+	queuesiz++;
1143	+	}
1144	+
1145	+
1146	+	clearqueue()                            /* process queue */
1147	+	{
1148	+	FVECT   orig, dir;
1149	+	float   fbuf[6*(PACKSIZ+1)];
1150	+	register float  *fbp;
1151	+	register int    i;
1152	+	double  vx, vy;
1153	+
1154	+	if (queuesiz == 0)
1155	+	return;
1156	+	fbp = fbuf;
1157	+	for (i = 0; i < queuesiz; i++) {
1158	+	viewray(orig, dir, &ourview,
1159	+	(queue[i][0]+.5)/hresolu,
1160	+	(queue[i][1]+.5)/vresolu);
1161	+	*fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1162	+	*fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1163	+	}
1164	+	/* mark end and get results */
1165	+	bzero((char *)fbp, 6*sizeof(float));
1166	+	if (process(PDesc, fbuf, fbuf, 4*sizeof(float)*queuesiz,
1167	+	6*sizeof(float)*(queuesiz+1)) !=
1168	+	4*sizeof(float)*queuesiz) {
1169	+	fprintf(stderr, "%s: error reading from rtrace process\n",
1170	+	progname);
1171	+	exit(1);
1172	+	}
1173	+	fbp = fbuf;
1174	+	for (i = 0; i < queuesiz; i++) {
1175	+	if (ourexp > 0 && ourexp != 1.0) {
1176	+	fbp[0] *= ourexp;
1177	+	fbp[1] *= ourexp;
1178	+	fbp[2] *= ourexp;
1179	+	}
1180	+	if (averaging) {
1181	+	setcolor(sscan(queue[i][1])[queue[i][0]],
1182	+	fbp[0], fbp[1], fbp[2]);
1183	+	wscan(queue[i][1])[queue[i][0]] = 1;
1184	+	} else
1185	+	setcolr(pscan(queue[i][1])[queue[i][0]],
1186	+	fbp[0], fbp[1], fbp[2]);
1187	+	if (zisnorm)
1188	+	zscan(queue[i][1])[queue[i][0]] = fbp[3];
1189	+	else {
1190	+	vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1191	+	vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1192	+	zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1193	+	vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1194	+	}
1195	+	fbp += 4;
1196	+	}
1197	+	queuesiz = 0;
1198	+	}
1199	+
1200	+
1201	+	syserror(s)                     /* report error and exit */
1202	+	char    *s;
1203	+	{
1204	+	perror(s);
1205	+	exit(1);
1206		}

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