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

Comparing ray/src/px/pinterp.c (file contents):
Revision 1.6 by greg, Thu Dec 28 15:09:28 1989 UTC vs.
Revision 2.35 by schorsch, Mon Jun 30 14:59:12 2003 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 "standard.h"
16	+	#include "rtprocess.h" /* Windows: must come before color.h */
17	+	#include "view.h"
18		#include "color.h"
19
20	<	#define pscan(y)        (ourpict+(y)*ourview.hresolu)
18	<	#define zscan(y)        (ourzbuf+(y)*ourview.hresolu)
20	>	#define LOG2            0.69314718055994530942
21
22	+	#define pscan(y)        (ourpict+(y)*hresolu)
23	+	#define sscan(y)        (ourspict+(y)*hresolu)
24	+	#define wscan(y)        (ourweigh+(y)*hresolu)
25	+	#define zscan(y)        (ourzbuf+(y)*hresolu)
26	+	#define bscan(y)        (ourbpict+(y)*hresolu)
27	+	#define averaging       (ourweigh != NULL)
28	+	#define blurring        (ourbpict != NULL)
29	+	#define usematrix       (hasmatrix & !averaging)
30	+	#define zisnorm         (!usematrix | ourview.type != VT_PER)
31	+
32	+	#define MAXWT           1000.           /* maximum pixel weight (averaging) */
33	+
34	+	#define F_FORE          1               /* fill foreground */
35	+	#define F_BACK          2               /* fill background */
36	+
37	+	#define PACKSIZ         256             /* max. calculation packet size */
38	+
39	+	#define RTCOM           "rtrace -h- -ovl -fff -ld- -i- -I- "
40	+
41		#define ABS(x)          ((x)>0?(x):-(x))
42
43	<	VIEW    ourview = STDVIEW(512);         /* desired view */
43	>	struct position {int x,y; float z;};
44
45	<	double  zeps = 0.001;                   /* allowed z epsilon */
45	>	#define NSTEPS          64              /* number steps in overlap prescan */
46	>	#define MINSTEP         4               /* minimum worthwhile preview step */
47
48	<	COLR    *ourpict;                       /* output picture */
48	>	struct bound {int min,max;};
49	>
50	>	VIEW    ourview = STDVIEW;              /* desired view */
51	>	int     hresolu = 512;                  /* horizontal resolution */
52	>	int     vresolu = 512;                  /* vertical resolution */
53	>	double  pixaspect = 1.0;                /* pixel aspect ratio */
54	>
55	>	double  zeps = .02;                     /* allowed z epsilon */
56	>
57	>	COLR    *ourpict;                       /* output picture (COLR's) */
58	>	COLOR   *ourspict;                      /* output pixel sums (averaging) */
59	>	float   *ourweigh = NULL;               /* output pixel weights (averaging) */
60		float   *ourzbuf;                       /* corresponding z-buffer */
61	+	COLOR   *ourbpict = NULL;               /* blurred picture (view averaging) */
62
63	+	VIEW    avgview;                        /* average view for -B option */
64	+	int     nvavg;                          /* number of views averaged */
65	+
66		char    *progname;
67
68	<	VIEW    theirview = STDVIEW(512);       /* input view */
68	>	int     fillo = F_FORE|F_BACK;          /* selected fill options */
69	>	int     fillsamp = 0;                   /* sample separation (0 == inf) */
70	>	extern int      backfill(), rcalfill(); /* fill functions */
71	>	int     (*fillfunc)() = backfill;       /* selected fill function */
72	>	COLR    backcolr = BLKCOLR;             /* background color */
73	>	COLOR   backcolor = BLKCOLOR;           /* background color (float) */
74	>	double  backz = 0.0;                    /* background z value */
75	>	int     normdist = 1;                   /* i/o normalized distance? */
76	>	char    ourfmt[LPICFMT+1] = PICFMT;     /* original picture format */
77	>	double  ourexp = -1;                    /* original picture exposure */
78	>	int     expadj = 0;                     /* exposure adjustment (f-stops) */
79	>	double  rexpadj = 1;                    /* real exposure adjustment */
80	>
81	>	VIEW    theirview;                      /* input view */
82		int     gotview;                        /* got input view? */
83	+	int     wrongformat = 0;                /* input in another format? */
84	+	RESOLU  tresolu;                        /* input resolution */
85	+	double  theirexp;                       /* input picture exposure */
86	+	MAT4    theirs2ours;                    /* transformation matrix */
87	+	int     hasmatrix = 0;                  /* has transformation matrix */
88
89	<	double  theirs2ours[4][4];              /* transformation matrix */
89	>	static SUBPROC PDesc = SP_INACTIVE; /* rtrace process descriptor */
90	>	unsigned short  queue[PACKSIZ][2];      /* pending pixels */
91	>	int     packsiz;                        /* actual packet size */
92	>	int     queuesiz = 0;                   /* number of pixels pending */
93
94	+	extern double   movepixel();
95
96	+
97		main(argc, argv)                        /* interpolate pictures */
98		int     argc;
99		char    *argv[];
100		{
101	<	#define check(olen,narg)        if (argv[i][olen] || narg >= argc-i) goto badopt
101	>	#define  check(ol,al)           if (argv[an][ol] || \
102	>	badarg(argc-an-1,argv+an+1,al)) \
103	>	goto badopt
104		int     gotvfile = 0;
105	<	char    *err;
106	<	int     i;
105	>	int     doavg = -1;
106	>	int     doblur = 0;
107	>	char    *zfile = NULL;
108	>	char    *expcomp = NULL;
109	>	int     i, an, rval;
110
111		progname = argv[0];
112
113	<	for (i = 1; i < argc && argv[i][0] == '-'; i++)
114	<	switch (argv[i][1]) {
113	>	for (an = 1; an < argc && argv[an][0] == '-'; an++) {
114	>	rval = getviewopt(&ourview, argc-an, argv+an);
115	>	if (rval >= 0) {
116	>	an += rval;
117	>	continue;
118	>	}
119	>	switch (argv[an][1]) {
120	>	case 'e':                               /* exposure */
121	>	check(2,"f");
122	>	expcomp = argv[++an];
123	>	break;
124		case 't':                               /* threshold */
125	<	check(2,1);
126	<	zeps = atof(argv[++i]);
125	>	check(2,"f");
126	>	zeps = atof(argv[++an]);
127		break;
128	<	case 'x':                               /* x resolution */
129	<	check(2,1);
130	<	ourview.hresolu = atoi(argv[++i]);
128	>	case 'a':                               /* average */
129	>	check(2,NULL);
130	>	doavg = 1;
131		break;
132	<	case 'y':                               /* y resolution */
133	<	check(2,1);
134	<	ourview.vresolu = atoi(argv[++i]);
132	>	case 'B':                               /* blur views */
133	>	check(2,NULL);
134	>	doblur = 1;
135		break;
136	<	case 'v':                               /* view */
137	<	switch (argv[i][2]) {
138	<	case 't':                               /* type */
139	<	check(4,0);
140	<	ourview.type = argv[i][3];
136	>	case 'q':                               /* quick (no avg.) */
137	>	check(2,NULL);
138	>	doavg = 0;
139	>	break;
140	>	case 'n':                               /* dist. normalized? */
141	>	check(2,NULL);
142	>	normdist = !normdist;
143	>	break;
144	>	case 'f':                               /* fill type */
145	>	switch (argv[an][2]) {
146	>	case '0':                               /* none */
147	>	check(3,NULL);
148	>	fillo = 0;
149		break;
150	<	case 'p':                               /* point */
151	<	check(3,3);
152	<	ourview.vp[0] = atof(argv[++i]);
71	<	ourview.vp[1] = atof(argv[++i]);
72	<	ourview.vp[2] = atof(argv[++i]);
150	>	case 'f':                               /* foreground */
151	>	check(3,NULL);
152	>	fillo = F_FORE;
153		break;
154	<	case 'd':                               /* direction */
155	<	check(3,3);
156	<	ourview.vdir[0] = atof(argv[++i]);
77	<	ourview.vdir[1] = atof(argv[++i]);
78	<	ourview.vdir[2] = atof(argv[++i]);
154	>	case 'b':                               /* background */
155	>	check(3,NULL);
156	>	fillo = F_BACK;
157		break;
158	<	case 'u':                               /* up */
159	<	check(3,3);
160	<	ourview.vup[0] = atof(argv[++i]);
83	<	ourview.vup[1] = atof(argv[++i]);
84	<	ourview.vup[2] = atof(argv[++i]);
158	>	case 'a':                               /* all */
159	>	check(3,NULL);
160	>	fillo = F_FORE|F_BACK;
161		break;
162	<	case 'h':                               /* horizontal */
163	<	check(3,1);
164	<	ourview.horiz = atof(argv[++i]);
162	>	case 's':                               /* sample */
163	>	check(3,"i");
164	>	fillsamp = atoi(argv[++an]);
165		break;
166	<	case 'v':                               /* vertical */
167	<	check(3,1);
168	<	ourview.vert = atof(argv[++i]);
166	>	case 'c':                               /* color */
167	>	check(3,"fff");
168	>	fillfunc = backfill;
169	>	setcolor(backcolor, atof(argv[an+1]),
170	>	atof(argv[an+2]), atof(argv[an+3]));
171	>	setcolr(backcolr, colval(backcolor,RED),
172	>	colval(backcolor,GRN),
173	>	colval(backcolor,BLU));
174	>	an += 3;
175		break;
176	<	case 'f':                               /* file */
177	<	check(3,1);
178	<	gotvfile = viewfile(argv[++i], &ourview);
179	<	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	<	}
176	>	case 'z':                               /* z value */
177	>	check(3,"f");
178	>	fillfunc = backfill;
179	>	backz = atof(argv[++an]);
180		break;
181	+	case 'r':                               /* rtrace */
182	+	check(3,"s");
183	+	fillfunc = rcalfill;
184	+	calstart(RTCOM, argv[++an]);
185	+	break;
186		default:
187		goto badopt;
188		}
189		break;
190	+	case 'z':                               /* z file */
191	+	check(2,"s");
192	+	zfile = argv[++an];
193	+	break;
194	+	case 'x':                               /* x resolution */
195	+	check(2,"i");
196	+	hresolu = atoi(argv[++an]);
197	+	break;
198	+	case 'y':                               /* y resolution */
199	+	check(2,"i");
200	+	vresolu = atoi(argv[++an]);
201	+	break;
202	+	case 'p':                               /* pixel aspect */
203	+	if (argv[an][2] != 'a')
204	+	goto badopt;
205	+	check(3,"f");
206	+	pixaspect = atof(argv[++an]);
207	+	break;
208	+	case 'v':                               /* view file */
209	+	if (argv[an][2] != 'f')
210	+	goto badopt;
211	+	check(3,"s");
212	+	gotvfile = viewfile(argv[++an], &ourview, NULL);
213	+	if (gotvfile < 0)
214	+	syserror(argv[an]);
215	+	else if (gotvfile == 0) {
216	+	fprintf(stderr, "%s: bad view file\n",
217	+	argv[an]);
218	+	exit(1);
219	+	}
220	+	break;
221		default:
222		badopt:
223	<	fprintf(stderr, "%s: unknown option '%s'\n",
224	<	progname, argv[i]);
225	<	exit(1);
223	>	fprintf(stderr, "%s: command line error at '%s'\n",
224	>	progname, argv[an]);
225	>	goto userr;
226		}
227	+	}
228		/* check arguments */
229	<	if (argc-i < 2 || (argc-i)%2) {
230	<	fprintf(stderr, "Usage: %s [view args] pfile zfile ..\n",
229	>	if ((argc-an)%2)
230	>	goto userr;
231	>	if (fillsamp == 1)
232	>	fillo &= ~F_BACK;
233	>	if (doavg < 0)
234	>	doavg = (argc-an) > 2;
235	>	if (expcomp != NULL)
236	>	if (expcomp[0] == '+' | expcomp[0] == '-') {
237	>	expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
238	>	if (doavg | doblur)
239	>	rexpadj = pow(2.0, atof(expcomp));
240	>	else
241	>	rexpadj = pow(2.0, (double)expadj);
242	>	} else {
243	>	if (!isflt(expcomp))
244	>	goto userr;
245	>	rexpadj = atof(expcomp);
246	>	expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
247	>	if (!(doavg | doblur))
248	>	rexpadj = pow(2.0, (double)expadj);
249	>	}
250	>	/* set view */
251	>	if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
252	>	fprintf(stderr, "%s: no view on standard input!\n",
253		progname);
254		exit(1);
255		}
256	<	/* set view */
123	<	if (err = setview(&ourview)) {
124	<	fprintf(stderr, "%s: %s\n", progname, err);
125	<	exit(1);
126	<	}
256	>	normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
257		/* allocate frame */
258	<	ourpict = (COLR *)calloc(ourview.hresolu*ourview.vresolu,sizeof(COLR));
259	<	ourzbuf = (float *)calloc(ourview.hresolu*ourview.vresolu,sizeof(float));
260	<	if (ourpict == NULL || ourzbuf == NULL) {
261	<	perror(progname);
262	<	exit(1);
258	>	if (doavg) {
259	>	ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
260	>	ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
261	>	if (ourspict == NULL | ourweigh == NULL)
262	>	syserror(progname);
263	>	} else {
264	>	ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
265	>	if (ourpict == NULL)
266	>	syserror(progname);
267		}
268	<	/* get input */
269	<	for ( ; i < argc; i += 2)
270	<	addpicture(argv[i], argv[i+1]);
271	<	/* fill in spaces */
272	<	fillpicture();
268	>	if (doblur) {
269	>	ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
270	>	if (ourbpict == NULL)
271	>	syserror(progname);
272	>	}
273	>	ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
274	>	if (ourzbuf == NULL)
275	>	syserror(progname);
276	>	/* new header */
277	>	newheader("RADIANCE", stdout);
278	>	fputnow(stdout);
279	>	/* run pictures */
280	>	do {
281	>	memset((char *)ourzbuf, '\0', hresolu*vresolu*sizeof(float));
282	>	for (i = an; i < argc; i += 2)
283	>	addpicture(argv[i], argv[i+1]);
284	>	if (fillo&F_BACK)                       /* fill in spaces */
285	>	backpicture(fillfunc, fillsamp);
286	>	else
287	>	fillpicture(fillfunc);
288	>	/* aft clipping */
289	>	clipaft();
290	>	} while (addblur() && nextview(stdin) != EOF);
291	>	/* close calculation */
292	>	caldone();
293		/* add to header */
294		printargs(argc, argv, stdout);
295	<	if (gotvfile) {
296	<	printf(VIEWSTR);
297	<	fprintview(&ourview, stdout);
298	<	printf("\n");
295	>	compavgview();
296	>	if (doblur | gotvfile) {
297	>	fputs(VIEWSTR, stdout);
298	>	fprintview(&avgview, stdout);
299	>	putc('\n', stdout);
300		}
301	<	printf("\n");
302	<	/* write output */
301	>	if (pixaspect < .99 | pixaspect > 1.01)
302	>	fputaspect(pixaspect, stdout);
303	>	if (ourexp > 0)
304	>	ourexp *= rexpadj;
305	>	else
306	>	ourexp = rexpadj;
307	>	if (ourexp < .995 | ourexp > 1.005)
308	>	fputexpos(ourexp, stdout);
309	>	if (strcmp(ourfmt, PICFMT))             /* print format if known */
310	>	fputformat(ourfmt, stdout);
311	>	putc('\n', stdout);
312	>	/* write picture */
313		writepicture();
314	+	/* write z file */
315	+	if (zfile != NULL)
316	+	writedistance(zfile);
317
318		exit(0);
319	+	userr:
320	+	fprintf(stderr,
321	+	"Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
322	+	progname);
323	+	exit(1);
324		#undef check
325		}
326
327
328	+	int
329		headline(s)                             /* process header string */
330		char    *s;
331		{
332	<	static char     *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL};
159	<	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(0);
336	>	if (formatval(fmt, s)) {
337	>	if (globmatch(ourfmt, fmt)) {
338	>	wrongformat = 0;
339	>	strcpy(ourfmt, fmt);
340	>	} else
341	>	wrongformat = 1;
342	>	return(0);
343	>	}
344	>	if (nvavg < 2) {
345	>	putc('\t', stdout);
346	>	fputs(s, stdout);
347	>	}
348	>	if (isexpos(s)) {
349	>	theirexp *= exposval(s);
350	>	return(0);
351	>	}
352	>	if (isview(s) && sscanview(&theirview, s) > 0)
353	>	gotview++;
354	>	return(0);
355		}
356
357
358	<	addpicture(pfile, zfile)                /* add picture to output */
359	<	char    *pfile, *zfile;
358	>	nextview(fp)                            /* get and set next view */
359	>	FILE    *fp;
360		{
361	<	FILE    *pfp, *zfp;
176	<	COLR    *scanin;
177	<	float   *zin;
361	>	char    linebuf[256];
362		char    *err;
363	<	int     xres, yres;
364	<	int     y;
365	<	/* open input files */
366	<	if ((pfp = fopen(pfile, "r")) == NULL) {
367	<	perror(pfile);
368	<	exit(1);
363	>	register int    i;
364	>
365	>	if (fp != NULL) {
366	>	do                      /* get new view */
367	>	if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
368	>	return(EOF);
369	>	while (!isview(linebuf) || !sscanview(&ourview, linebuf));
370		}
371	<	if ((zfp = fopen(zfile, "r")) == NULL) {
372	<	perror(zfile);
371	>	/* set new view */
372	>	if ((err = setview(&ourview)) != NULL) {
373	>	fprintf(stderr, "%s: %s\n", progname, err);
374		exit(1);
375		}
376	<	/* get header and view */
377	<	printf("%s:\n", pfile);
376	>	if (!nvavg) {                   /* first view */
377	>	copystruct(&avgview, &ourview);
378	>	return(nvavg++);
379	>	}
380	>	/* add to average view */
381	>	for (i = 0; i < 3; i++) {
382	>	avgview.vp[i] += ourview.vp[i];
383	>	avgview.vdir[i] += ourview.vdir[i];
384	>	avgview.vup[i] += ourview.vup[i];
385	>	}
386	>	avgview.horiz += ourview.horiz;
387	>	avgview.vert += ourview.vert;
388	>	avgview.hoff += ourview.hoff;
389	>	avgview.voff += ourview.voff;
390	>	avgview.vfore += ourview.vfore;
391	>	avgview.vaft += ourview.vaft;
392	>	return(nvavg++);
393	>	}
394	>
395	>
396	>	compavgview()                           /* compute average view */
397	>	{
398	>	register int    i;
399	>	double  f;
400	>
401	>	if (nvavg < 2)
402	>	return;
403	>	f = 1.0/nvavg;
404	>	for (i = 0; i < 3; i++) {
405	>	avgview.vp[i] *= f;
406	>	avgview.vdir[i] *= f;
407	>	avgview.vup[i] *= f;
408	>	}
409	>	avgview.horiz *= f;
410	>	avgview.vert *= f;
411	>	avgview.hoff *= f;
412	>	avgview.voff *= f;
413	>	avgview.vfore *= f;
414	>	avgview.vaft *= f;
415	>	if (setview(&avgview) != NULL)          /* in case of emergency... */
416	>	copystruct(&avgview, &ourview);
417	>	pixaspect = viewaspect(&avgview) * hresolu / vresolu;
418	>	}
419	>
420	>
421	>	addpicture(pfile, zspec)                /* add picture to output */
422	>	char    *pfile, *zspec;
423	>	{
424	>	FILE    *pfp;
425	>	int     zfd;
426	>	char    *err;
427	>	COLR    *scanin;
428	>	float   *zin;
429	>	struct position *plast;
430	>	struct bound    *xlim, ylim;
431	>	int     y;
432	>	/* open picture file */
433	>	if ((pfp = fopen(pfile, "r")) == NULL)
434	>	syserror(pfile);
435	>	/* get header with exposure and view */
436	>	theirexp = 1.0;
437	>	copystruct(&theirview, &stdview);
438		gotview = 0;
439	<	getheader(pfp, headline);
440	<	if (!gotview || fgetresolu(&xres, &yres, pfp) != (YMAJOR|YDECR)) {
441	<	fprintf(stderr, "%s: picture view error\n", pfile);
439	>	if (nvavg < 2)
440	>	printf("%s:\n", pfile);
441	>	getheader(pfp, headline, NULL);
442	>	if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
443	>	fprintf(stderr, "%s: picture format error\n", pfile);
444		exit(1);
445		}
446	<	theirview.hresolu = xres;
447	<	theirview.vresolu = yres;
446	>	if (ourexp <= 0)
447	>	ourexp = theirexp;
448	>	else if (ABS(theirexp-ourexp) > .01*ourexp)
449	>	fprintf(stderr, "%s: different exposure (warning)\n", pfile);
450		if (err = setview(&theirview)) {
451		fprintf(stderr, "%s: %s\n", pfile, err);
452		exit(1);
453		}
454		/* compute transformation */
455	<	pixform(theirs2ours, &theirview, &ourview);
456	<	/* allocate scanlines */
457	<	scanin = (COLR *)malloc(xres*sizeof(COLR));
458	<	zin = (float *)malloc(xres*sizeof(float));
459	<	if (scanin == NULL || zin == NULL) {
460	<	perror(progname);
461	<	exit(1);
455	>	hasmatrix = pixform(theirs2ours, &theirview, &ourview);
456	>	/* get z specification or file */
457	>	zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
458	>	if (zin == NULL)
459	>	syserror(progname);
460	>	if ((zfd = open(zspec, O_RDONLY)) == -1) {
461	>	double  zvalue;
462	>	register int    x;
463	>	if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
464	>	syserror(zspec);
465	>	for (x = scanlen(&tresolu); x-- > 0; )
466	>	zin[x] = zvalue;
467		}
468	<	/* load image */
469	<	for (y = yres-1; y >= 0; y--) {
470	<	if (freadcolrs(scanin, xres, pfp) < 0) {
468	>	/* compute transferrable perimeter */
469	>	xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
470	>	if (xlim == NULL)
471	>	syserror(progname);
472	>	if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
473	>	free((void *)zin);
474	>	free((void *)xlim);
475	>	if (zfd != -1)
476	>	close(zfd);
477	>	fclose(pfp);
478	>	return;
479	>	}
480	>	/* allocate scanlines */
481	>	scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
482	>	plast = (struct position *)calloc(scanlen(&tresolu),
483	>	sizeof(struct position));
484	>	if (scanin == NULL | plast == NULL)
485	>	syserror(progname);
486	>	/* skip to starting point */
487	>	for (y = 0; y < ylim.min; y++)
488	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
489		fprintf(stderr, "%s: read error\n", pfile);
490		exit(1);
491		}
492	<	if (fread(zin, sizeof(float), xres, zfp) < xres) {
493	<	fprintf(stderr, "%s: read error\n", zfile);
492	>	if (zfd != -1 && lseek(zfd,
493	>	(off_t)ylim.min*scanlen(&tresolu)*sizeof(float), 0) < 0)
494	>	syserror(zspec);
495	>	/* load image */
496	>	for (y = ylim.min; y <= ylim.max; y++) {
497	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
498	>	fprintf(stderr, "%s: read error\n", pfile);
499		exit(1);
500		}
501	<	addscanline(y, scanin, zin);
501	>	if (zfd != -1 && read(zfd, (char *)zin,
502	>	scanlen(&tresolu)*sizeof(float))
503	>	< scanlen(&tresolu)*sizeof(float))
504	>	syserror(zspec);
505	>	addscanline(xlim+y, y, scanin, zin, plast);
506		}
507		/* clean up */
508	<	free((char *)scanin);
509	<	free((char *)zin);
508	>	free((void *)xlim);
509	>	free((void *)scanin);
510	>	free((void *)zin);
511	>	free((void *)plast);
512		fclose(pfp);
513	<	fclose(zfp);
513	>	if (zfd != -1)
514	>	close(zfd);
515		}
516
517
518		pixform(xfmat, vw1, vw2)                /* compute view1 to view2 matrix */
519	<	register double xfmat[4][4];
519	>	register MAT4   xfmat;
520		register VIEW   *vw1, *vw2;
521		{
522		double  m4t[4][4];
523
524	+	if (vw1->type != VT_PER & vw1->type != VT_PAR)
525	+	return(0);
526	+	if (vw2->type != VT_PER & vw2->type != VT_PAR)
527	+	return(0);
528		setident4(xfmat);
529	<	xfmat[0][0] = vw1->vhinc[0];
530	<	xfmat[0][1] = vw1->vhinc[1];
531	<	xfmat[0][2] = vw1->vhinc[2];
532	<	xfmat[1][0] = vw1->vvinc[0];
533	<	xfmat[1][1] = vw1->vvinc[1];
534	<	xfmat[1][2] = vw1->vvinc[2];
529	>	xfmat[0][0] = vw1->hvec[0];
530	>	xfmat[0][1] = vw1->hvec[1];
531	>	xfmat[0][2] = vw1->hvec[2];
532	>	xfmat[1][0] = vw1->vvec[0];
533	>	xfmat[1][1] = vw1->vvec[1];
534	>	xfmat[1][2] = vw1->vvec[2];
535		xfmat[2][0] = vw1->vdir[0];
536		xfmat[2][1] = vw1->vdir[1];
537		xfmat[2][2] = vw1->vdir[2];
#	Line 250 | Line 539 | register VIEW  *vw1, *vw2;
539		xfmat[3][1] = vw1->vp[1];
540		xfmat[3][2] = vw1->vp[2];
541		setident4(m4t);
542	<	m4t[0][0] = vw2->vhinc[0]/vw2->vhn2;
543	<	m4t[1][0] = vw2->vhinc[1]/vw2->vhn2;
544	<	m4t[2][0] = vw2->vhinc[2]/vw2->vhn2;
545	<	m4t[3][0] = -DOT(vw2->vp,vw2->vhinc)/vw2->vhn2;
546	<	m4t[0][1] = vw2->vvinc[0]/vw2->vvn2;
547	<	m4t[1][1] = vw2->vvinc[1]/vw2->vvn2;
548	<	m4t[2][1] = vw2->vvinc[2]/vw2->vvn2;
549	<	m4t[3][1] = -DOT(vw2->vp,vw2->vvinc)/vw2->vvn2;
542	>	m4t[0][0] = vw2->hvec[0]/vw2->hn2;
543	>	m4t[1][0] = vw2->hvec[1]/vw2->hn2;
544	>	m4t[2][0] = vw2->hvec[2]/vw2->hn2;
545	>	m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
546	>	m4t[0][1] = vw2->vvec[0]/vw2->vn2;
547	>	m4t[1][1] = vw2->vvec[1]/vw2->vn2;
548	>	m4t[2][1] = vw2->vvec[2]/vw2->vn2;
549	>	m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
550		m4t[0][2] = vw2->vdir[0];
551		m4t[1][2] = vw2->vdir[1];
552		m4t[2][2] = vw2->vdir[2];
553		m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
554		multmat4(xfmat, xfmat, m4t);
555	+	return(1);
556		}
557
558
559	<	addscanline(y, pline, zline)            /* add scanline to output */
559	>	addscanline(xl, y, pline, zline, lasty) /* add scanline to output */
560	>	struct bound    *xl;
561		int     y;
562		COLR    *pline;
563		float   *zline;
564	+	struct position *lasty;         /* input/output */
565		{
566	<	extern double   sqrt();
567	<	double  pos[3];
566	>	FVECT   pos;
567	>	struct position lastx, newpos;
568	>	double  wt;
569		register int    x;
277	–	register int    xpos, ypos;
570
571	<	for (x = 0; x < theirview.hresolu; x++) {
572	<	pos[0] = x - .5*(theirview.hresolu-1);
573	<	pos[1] = y - .5*(theirview.vresolu-1);
571	>	lastx.z = 0;
572	>	for (x = xl->max; x >= xl->min; x--) {
573	>	pix2loc(pos, &tresolu, x, y);
574		pos[2] = zline[x];
575	+	if ((wt = movepixel(pos)) <= FTINY) {
576	+	lasty[x].z = lastx.z = 0;       /* mark invalid */
577	+	continue;
578	+	}
579	+	/* add pixel to our image */
580	+	newpos.x = pos[0] * hresolu;
581	+	newpos.y = pos[1] * vresolu;
582	+	newpos.z = zline[x];
583	+	addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
584	+	lasty[x].x = lastx.x = newpos.x;
585	+	lasty[x].y = lastx.y = newpos.y;
586	+	lasty[x].z = lastx.z = newpos.z;
587	+	}
588	+	}
589	+
590	+
591	+	addpixel(p0, p1, p2, pix, w, z)         /* fill in pixel parallelogram */
592	+	struct position *p0, *p1, *p2;
593	+	COLR    pix;
594	+	double  w;
595	+	double  z;
596	+	{
597	+	double  zt = 2.*zeps*p0->z;             /* threshold */
598	+	COLOR   pval;                           /* converted+weighted pixel */
599	+	int     s1x, s1y, s2x, s2y;             /* step sizes */
600	+	int     l1, l2, c1, c2;                 /* side lengths and counters */
601	+	int     p1isy;                          /* p0p1 along y? */
602	+	int     x1, y1;                         /* p1 position */
603	+	register int    x, y;                   /* final position */
604	+
605	+	/* compute vector p0p1 */
606	+	if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
607	+	s1x = p1->x - p0->x;
608	+	s1y = p1->y - p0->y;
609	+	l1 = ABS(s1x);
610	+	if (p1isy = (ABS(s1y) > l1))
611	+	l1 = ABS(s1y);
612	+	else if (l1 < 1)
613	+	l1 = 1;
614	+	} else {
615	+	l1 = s1x = s1y = 1;
616	+	p1isy = -1;
617	+	}
618	+	/* compute vector p0p2 */
619	+	if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
620	+	s2x = p2->x - p0->x;
621	+	s2y = p2->y - p0->y;
622	+	if (p1isy == 1)
623	+	l2 = ABS(s2x);
624	+	else {
625	+	l2 = ABS(s2y);
626	+	if (p1isy != 0 && ABS(s2x) > l2)
627	+	l2 = ABS(s2x);
628	+	}
629	+	if (l2 < 1)
630	+	l2 = 1;
631	+	} else
632	+	l2 = s2x = s2y = 1;
633	+	/* fill the parallelogram */
634	+	if (averaging) {
635	+	colr_color(pval, pix);
636	+	scalecolor(pval, w);
637	+	}
638	+	for (c1 = l1; c1-- > 0; ) {
639	+	x1 = p0->x + c1*s1x/l1;
640	+	y1 = p0->y + c1*s1y/l1;
641	+	for (c2 = l2; c2-- > 0; ) {
642	+	x = x1 + c2*s2x/l2;
643	+	if (x < 0 | x >= hresolu)
644	+	continue;
645	+	y = y1 + c2*s2y/l2;
646	+	if (y < 0 | y >= vresolu)
647	+	continue;
648	+	if (averaging) {
649	+	if (zscan(y)[x] <= 0 || zscan(y)[x]-z
650	+	> zeps*zscan(y)[x]) {
651	+	copycolor(sscan(y)[x], pval);
652	+	wscan(y)[x] = w;
653	+	zscan(y)[x] = z;
654	+	} else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
655	+	addcolor(sscan(y)[x], pval);
656	+	wscan(y)[x] += w;
657	+	}
658	+	} else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
659	+	> zeps*zscan(y)[x]) {
660	+	copycolr(pscan(y)[x], pix);
661	+	zscan(y)[x] = z;
662	+	}
663	+	}
664	+	}
665	+	}
666	+
667	+
668	+	double
669	+	movepixel(pos)                          /* reposition image point */
670	+	register FVECT  pos;
671	+	{
672	+	FVECT   pt, tdir, odir;
673	+	double  d;
674	+
675	+	if (pos[2] <= 0)                /* empty pixel */
676	+	return(0);
677	+	if (usematrix) {
678	+	pos[0] += theirview.hoff - .5;
679	+	pos[1] += theirview.voff - .5;
680	+	if (normdist & theirview.type == VT_PER)
681	+	d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
682	+	+ pos[1]*pos[1]*theirview.vn2);
683	+	else
684	+	d = 1.;
685	+	pos[2] += d*theirview.vfore;
686		if (theirview.type == VT_PER) {
687	<	pos[2] /= sqrt( 1.
285	<	+ pos[0]*pos[0]*theirview.vhn2
286	<	+ pos[1]*pos[1]*theirview.vvn2 );
687	>	pos[2] /= d;
688		pos[0] *= pos[2];
689		pos[1] *= pos[2];
690		}
691		multp3(pos, pos, theirs2ours);
692	<	if (pos[2] <= 0.0)
693	<	continue;
692	>	if (pos[2] <= ourview.vfore)
693	>	return(0);
694		if (ourview.type == VT_PER) {
695		pos[0] /= pos[2];
696		pos[1] /= pos[2];
697		}
698	<	pos[0] += .5*ourview.hresolu;
699	<	pos[1] += .5*ourview.vresolu;
700	<	if (pos[0] < 0 || pos[0] > ourview.hresolu
701	<	|| pos[1] < 0 || pos[1] > ourview.vresolu)
702	<	continue;
703	<	/* check current value at pos */
704	<	xpos = pos[0];
705	<	ypos = pos[1];
706	<	if (zscan(ypos)[xpos] <= 0.0
707	<	|| zscan(ypos)[xpos] - pos[2]
708	<	> zeps*zscan(ypos)[xpos]) {
709	<	zscan(ypos)[xpos] = pos[2];
710	<	copycolr(pscan(ypos)[xpos], pline[x]);
698	>	pos[0] += .5 - ourview.hoff;
699	>	pos[1] += .5 - ourview.voff;
700	>	pos[2] -= ourview.vfore;
701	>	} else {
702	>	if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
703	>	return(0);
704	>	if (!normdist & theirview.type == VT_PER)       /* adjust */
705	>	pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
706	>	+ pos[1]*pos[1]*theirview.vn2);
707	>	pt[0] += tdir[0]*pos[2];
708	>	pt[1] += tdir[1]*pos[2];
709	>	pt[2] += tdir[2]*pos[2];
710	>	viewloc(pos, &ourview, pt);
711	>	if (pos[2] <= 0)
712	>	return(0);
713	>	}
714	>	if (pos[0] < 0 | pos[0] >= 1-FTINY | pos[1] < 0 | pos[1] >= 1-FTINY)
715	>	return(0);
716	>	if (!averaging)
717	>	return(1);
718	>	/* compute pixel weight */
719	>	if (ourview.type == VT_PAR) {
720	>	d = DOT(ourview.vdir,tdir);
721	>	d = 1. - d*d;
722	>	} else {
723	>	VSUB(odir, pt, ourview.vp);
724	>	d = DOT(odir,tdir);
725	>	d = 1. - d*d/DOT(odir,odir);
726	>	}
727	>	if (d <= 1./MAXWT/MAXWT)
728	>	return(MAXWT);          /* clip to maximum weight */
729	>	return(1./sqrt(d));
730	>	}
731	>
732	>
733	>	getperim(xl, yl, zline, zfd)            /* compute overlapping image area */
734	>	register struct bound   *xl;
735	>	struct bound    *yl;
736	>	float   *zline;
737	>	int     zfd;
738	>	{
739	>	int     step;
740	>	FVECT   pos;
741	>	register int    x, y;
742	>	/* set up step size */
743	>	if (scanlen(&tresolu) < numscans(&tresolu))
744	>	step = scanlen(&tresolu)/NSTEPS;
745	>	else
746	>	step = numscans(&tresolu)/NSTEPS;
747	>	if (step < MINSTEP) {                   /* not worth cropping? */
748	>	yl->min = 0;
749	>	yl->max = numscans(&tresolu) - 1;
750	>	x = scanlen(&tresolu) - 1;
751	>	for (y = numscans(&tresolu); y--; ) {
752	>	xl[y].min = 0;
753	>	xl[y].max = x;
754		}
755	+	return(1);
756		}
757	+	yl->min = 32000; yl->max = 0;           /* search for points on image */
758	+	for (y = step - 1; y < numscans(&tresolu); y += step) {
759	+	if (zfd != -1) {
760	+	if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
761	+	0) < 0)
762	+	syserror("lseek");
763	+	if (read(zfd, (char *)zline,
764	+	scanlen(&tresolu)*sizeof(float))
765	+	< scanlen(&tresolu)*sizeof(float))
766	+	syserror("read");
767	+	}
768	+	xl[y].min = 32000; xl[y].max = 0;               /* x max */
769	+	for (x = scanlen(&tresolu); (x -= step) > 0; ) {
770	+	pix2loc(pos, &tresolu, x, y);
771	+	pos[2] = zline[x];
772	+	if (movepixel(pos) > FTINY) {
773	+	xl[y].max = x + step - 1;
774	+	xl[y].min = x - step + 1;       /* x min */
775	+	if (xl[y].min < 0)
776	+	xl[y].min = 0;
777	+	for (x = step - 1; x < xl[y].max; x += step) {
778	+	pix2loc(pos, &tresolu, x, y);
779	+	pos[2] = zline[x];
780	+	if (movepixel(pos) > FTINY) {
781	+	xl[y].min = x - step + 1;
782	+	break;
783	+	}
784	+	}
785	+	if (y < yl->min)                /* y limits */
786	+	yl->min = y - step + 1;
787	+	yl->max = y + step - 1;
788	+	break;
789	+	}
790	+	}
791	+	/* fill in between */
792	+	if (y < step) {
793	+	xl[y-1].min = xl[y].min;
794	+	xl[y-1].max = xl[y].max;
795	+	} else {
796	+	if (xl[y].min < xl[y-step].min)
797	+	xl[y-1].min = xl[y].min;
798	+	else
799	+	xl[y-1].min = xl[y-step].min;
800	+	if (xl[y].max > xl[y-step].max)
801	+	xl[y-1].max = xl[y].max;
802	+	else
803	+	xl[y-1].max = xl[y-step].max;
804	+	}
805	+	for (x = 2; x < step; x++)
806	+	copystruct(xl+y-x, xl+y-1);
807	+	}
808	+	if (yl->max >= numscans(&tresolu))
809	+	yl->max = numscans(&tresolu) - 1;
810	+	y -= step;
811	+	for (x = numscans(&tresolu) - 1; x > y; x--)    /* fill bottom rows */
812	+	copystruct(xl+x, xl+y);
813	+	return(yl->max >= yl->min);
814		}
815
816
817	<	fillpicture()                           /* fill in empty spaces */
817	>	backpicture(fill, samp)                 /* background fill algorithm */
818	>	int     (*fill)();
819	>	int     samp;
820		{
821		int     *yback, xback;
822		int     y;
319	–	COLR    pfill;
823		register int    x, i;
824		/* get back buffer */
825	<	yback = (int *)malloc(ourview.hresolu*sizeof(int));
826	<	if (yback == NULL) {
827	<	perror(progname);
828	<	return;
326	<	}
327	<	for (x = 0; x < ourview.hresolu; x++)
825	>	yback = (int *)malloc(hresolu*sizeof(int));
826	>	if (yback == NULL)
827	>	syserror(progname);
828	>	for (x = 0; x < hresolu; x++)
829		yback[x] = -2;
830	+	/*
831	+	* Xback and yback are the pixel locations of suitable
832	+	* background values in each direction.
833	+	* A value of -2 means unassigned, and -1 means
834	+	* that there is no suitable background in this direction.
835	+	*/
836		/* fill image */
837	<	for (y = 0; y < ourview.vresolu; y++) {
837	>	for (y = 0; y < vresolu; y++) {
838		xback = -2;
839	<	for (x = 0; x < ourview.hresolu; x++)
840	<	if (zscan(y)[x] <= 0.0) {       /* empty pixel */
839	>	for (x = 0; x < hresolu; x++)
840	>	if (zscan(y)[x] <= 0) {         /* empty pixel */
841	>	/*
842	>	* First, find background from above or below.
843	>	* (farthest assigned pixel)
844	>	*/
845		if (yback[x] == -2) {
846	<	for (i = y+1; i < ourview.vresolu; i++)
847	<	if (zscan(i)[x] > 0.0)
846	>	for (i = y+1; i < vresolu; i++)
847	>	if (zscan(i)[x] > 0)
848		break;
849	<	if (i < ourview.vresolu
849	>	if (i < vresolu
850		&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
851		yback[x] = i;
852		else
853		yback[x] = y-1;
854		}
855	+	/*
856	+	* Next, find background from left or right.
857	+	*/
858		if (xback == -2) {
859	<	for (i = x+1; x < ourview.hresolu; i++)
860	<	if (zscan(y)[i] > 0.0)
859	>	for (i = x+1; i < hresolu; i++)
860	>	if (zscan(y)[i] > 0)
861		break;
862	<	if (i < ourview.hresolu
862	>	if (i < hresolu
863		&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
864		xback = i;
865		else
866		xback = x-1;
867		}
868	+	/*
869	+	* If we have no background for this pixel,
870	+	* use the given fill function.
871	+	*/
872		if (xback < 0 && yback[x] < 0)
873	<	continue;
874	<	if (yback[x] < 0 || ABS(x-xback) <= 1
873	>	goto fillit;
874	>	/*
875	>	* Compare, and use the background that is
876	>	* farther, unless one of them is next to us.
877	>	* If the background is too distant, call
878	>	* the fill function.
879	>	*/
880	>	if ( yback[x] < 0
881	>	|| (xback >= 0 && ABS(x-xback) <= 1)
882		|| ( ABS(y-yback[x]) > 1
883	<	&& zscan(yback[x])[x] < zscan(y)[xback] ))
884	<	copycolr(pscan(y)[x],pscan(y)[xback]);
885	<	else
886	<	copycolr(pscan(y)[x],pscan(yback[x])[x]);
883	>	&& zscan(yback[x])[x]
884	>	< zscan(y)[xback] ) ) {
885	>	if (samp > 0 && ABS(x-xback) >= samp)
886	>	goto fillit;
887	>	if (averaging) {
888	>	copycolor(sscan(y)[x],
889	>	sscan(y)[xback]);
890	>	wscan(y)[x] = wscan(y)[xback];
891	>	} else
892	>	copycolr(pscan(y)[x],
893	>	pscan(y)[xback]);
894	>	zscan(y)[x] = zscan(y)[xback];
895	>	} else {
896	>	if (samp > 0 && ABS(y-yback[x]) > samp)
897	>	goto fillit;
898	>	if (averaging) {
899	>	copycolor(sscan(y)[x],
900	>	sscan(yback[x])[x]);
901	>	wscan(y)[x] =
902	>	wscan(yback[x])[x];
903	>	} else
904	>	copycolr(pscan(y)[x],
905	>	pscan(yback[x])[x]);
906	>	zscan(y)[x] = zscan(yback[x])[x];
907	>	}
908	>	continue;
909	>	fillit:
910	>	(*fill)(x,y);
911	>	if (fill == rcalfill) {         /* use it */
912	>	clearqueue();
913	>	xback = x;
914	>	yback[x] = y;
915	>	}
916		} else {                                /* full pixel */
917		yback[x] = -2;
918		xback = -2;
919		}
920		}
921	<	free((char *)yback);
921	>	free((void *)yback);
922		}
923
924
925	<	writepicture()                          /* write out picture */
925	>	fillpicture(fill)               /* paint in empty pixels using fill */
926	>	int     (*fill)();
927		{
928	+	register int    x, y;
929	+
930	+	for (y = 0; y < vresolu; y++)
931	+	for (x = 0; x < hresolu; x++)
932	+	if (zscan(y)[x] <= 0)
933	+	(*fill)(x,y);
934	+	if (fill == rcalfill)
935	+	clearqueue();
936	+	}
937	+
938	+
939	+	clipaft()                       /* perform aft clipping as indicated */
940	+	{
941	+	register int    x, y;
942	+	int     adjtest = ourview.type == VT_PER & zisnorm;
943	+	double  tstdist;
944	+	double  yzn2, vx;
945	+
946	+	if (ourview.vaft <= FTINY)
947	+	return(0);
948	+	tstdist = ourview.vaft - ourview.vfore;
949	+	for (y = 0; y < vresolu; y++) {
950	+	if (adjtest) {                          /* adjust test */
951	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
952	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
953	+	tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
954	+	}
955	+	for (x = 0; x < hresolu; x++)
956	+	if (zscan(y)[x] > tstdist) {
957	+	if (adjtest) {
958	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
959	+	if (zscan(y)[x] <= (ourview.vaft -
960	+	ourview.vfore) *
961	+	sqrt(vx*vx*ourview.hn2 + yzn2))
962	+	continue;
963	+	}
964	+	if (averaging)
965	+	memset(sscan(y)[x], '\0', sizeof(COLOR));
966	+	else
967	+	memset(pscan(y)[x], '\0', sizeof(COLR));
968	+	zscan(y)[x] = 0.0;
969	+	}
970	+	}
971	+	return(1);
972	+	}
973	+
974	+
975	+	addblur()                               /* add to blurred picture */
976	+	{
977	+	COLOR   cval;
978	+	double  d;
979	+	register int    i;
980	+
981	+	if (!blurring)
982	+	return(0);
983	+	i = hresolu*vresolu;
984	+	if (nvavg < 2)
985	+	if (averaging)
986	+	while (i--) {
987	+	copycolor(ourbpict[i], ourspict[i]);
988	+	d = 1.0/ourweigh[i];
989	+	scalecolor(ourbpict[i], d);
990	+	}
991	+	else
992	+	while (i--)
993	+	colr_color(ourbpict[i], ourpict[i]);
994	+	else
995	+	if (averaging)
996	+	while (i--) {
997	+	copycolor(cval, ourspict[i]);
998	+	d = 1.0/ourweigh[i];
999	+	scalecolor(cval, d);
1000	+	addcolor(ourbpict[i], cval);
1001	+	}
1002	+	else
1003	+	while (i--) {
1004	+	colr_color(cval, ourpict[i]);
1005	+	addcolor(ourbpict[i], cval);
1006	+	}
1007	+	/* print view */
1008	+	printf("VIEW%d:", nvavg);
1009	+	fprintview(&ourview, stdout);
1010	+	putchar('\n');
1011	+	return(1);
1012	+	}
1013	+
1014	+
1015	+	writepicture()                          /* write out picture (alters buffer) */
1016	+	{
1017		int     y;
1018	+	register int    x;
1019	+	double  d;
1020
1021	<	fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout);
1022	<	for (y = ourview.vresolu-1; y >= 0; y--)
1023	<	if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) {
1024	<	perror(progname);
1025	<	exit(1);
1021	>	fprtresolu(hresolu, vresolu, stdout);
1022	>	for (y = vresolu-1; y >= 0; y--)
1023	>	if (blurring) {
1024	>	for (x = 0; x < hresolu; x++) { /* compute avg. */
1025	>	d = rexpadj/nvavg;
1026	>	scalecolor(bscan(y)[x], d);
1027	>	}
1028	>	if (fwritescan(bscan(y), hresolu, stdout) < 0)
1029	>	syserror(progname);
1030	>	} else if (averaging) {
1031	>	for (x = 0; x < hresolu; x++) { /* average pixels */
1032	>	d = rexpadj/wscan(y)[x];
1033	>	scalecolor(sscan(y)[x], d);
1034	>	}
1035	>	if (fwritescan(sscan(y), hresolu, stdout) < 0)
1036	>	syserror(progname);
1037	>	} else {
1038	>	if (expadj)
1039	>	shiftcolrs(pscan(y), hresolu, expadj);
1040	>	if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1041	>	syserror(progname);
1042		}
1043	+	}
1044	+
1045	+
1046	+	writedistance(fname)                    /* write out z file (alters buffer) */
1047	+	char    *fname;
1048	+	{
1049	+	int     donorm = normdist & !zisnorm ? 1 :
1050	+	ourview.type == VT_PER & !normdist & zisnorm ? -1 : 0;
1051	+	int     fd;
1052	+	int     y;
1053	+
1054	+	if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1055	+	syserror(fname);
1056	+	for (y = vresolu-1; y >= 0; y--) {
1057	+	if (donorm) {
1058	+	double  vx, yzn2, d;
1059	+	register int    x;
1060	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1061	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1062	+	for (x = 0; x < hresolu; x++) {
1063	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
1064	+	d = sqrt(vx*vx*ourview.hn2 + yzn2);
1065	+	if (donorm > 0)
1066	+	zscan(y)[x] *= d;
1067	+	else
1068	+	zscan(y)[x] /= d;
1069	+	}
1070	+	}
1071	+	if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1072	+	< hresolu*sizeof(float))
1073	+	syserror(fname);
1074	+	}
1075	+	close(fd);
1076	+	}
1077	+
1078	+
1079	+	backfill(x, y)                          /* fill pixel with background */
1080	+	int     x, y;
1081	+	{
1082	+	if (averaging) {
1083	+	copycolor(sscan(y)[x], backcolor);
1084	+	wscan(y)[x] = 1;
1085	+	} else
1086	+	copycolr(pscan(y)[x], backcolr);
1087	+	zscan(y)[x] = backz;
1088	+	}
1089	+
1090	+
1091	+	calstart(prog, args)                    /* start fill calculation */
1092	+	char    *prog, *args;
1093	+	{
1094	+	char    combuf[512];
1095	+	char    *argv[64];
1096	+	int     rval;
1097	+	register char   **wp, *cp;
1098	+
1099	+	if (PDesc.running) {
1100	+	fprintf(stderr, "%s: too many calculations\n", progname);
1101	+	exit(1);
1102	+	}
1103	+	strcpy(combuf, prog);
1104	+	strcat(combuf, args);
1105	+	cp = combuf;
1106	+	wp = argv;
1107	+	for ( ; ; ) {
1108	+	while (isspace(*cp))    /* nullify spaces */
1109	+	*cp++ = '\0';
1110	+	if (!*cp)               /* all done? */
1111	+	break;
1112	+	*wp++ = cp;             /* add argument to list */
1113	+	while (*++cp && !isspace(*cp))
1114	+	;
1115	+	}
1116	+	*wp = NULL;
1117	+	/* start process */
1118	+	if ((rval = open_process(&PDesc, argv)) < 0)
1119	+	syserror(progname);
1120	+	if (rval == 0) {
1121	+	fprintf(stderr, "%s: command not found\n", argv[0]);
1122	+	exit(1);
1123	+	}
1124	+	packsiz = rval/(6*sizeof(float)) - 1;
1125	+	if (packsiz > PACKSIZ)
1126	+	packsiz = PACKSIZ;
1127	+	queuesiz = 0;
1128	+	}
1129	+
1130	+
1131	+	caldone()                               /* done with calculation */
1132	+	{
1133	+	if (!PDesc.running)
1134	+	return;
1135	+	clearqueue();
1136	+	close_process(&PDesc);
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	+	memset((char *)fbp, '\0', 6*sizeof(float));
1172	+	if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1173	+	4*sizeof(float)*(queuesiz+1),
1174	+	6*sizeof(float)*(queuesiz+1)) !=
1175	+	4*sizeof(float)*(queuesiz+1)) {
1176	+	fprintf(stderr, "%s: error reading from rtrace process\n",
1177	+	progname);
1178	+	exit(1);
1179	+	}
1180	+	fbp = fbuf;
1181	+	for (i = 0; i < queuesiz; i++) {
1182	+	if (ourexp > 0 && ourexp != 1.0) {
1183	+	fbp[0] *= ourexp;
1184	+	fbp[1] *= ourexp;
1185	+	fbp[2] *= ourexp;
1186	+	}
1187	+	if (averaging) {
1188	+	setcolor(sscan(queue[i][1])[queue[i][0]],
1189	+	fbp[0], fbp[1], fbp[2]);
1190	+	wscan(queue[i][1])[queue[i][0]] = 1;
1191	+	} else
1192	+	setcolr(pscan(queue[i][1])[queue[i][0]],
1193	+	fbp[0], fbp[1], fbp[2]);
1194	+	if (zisnorm)
1195	+	zscan(queue[i][1])[queue[i][0]] = fbp[3];
1196	+	else {
1197	+	vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1198	+	vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1199	+	zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1200	+	vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1201	+	}
1202	+	fbp += 4;
1203	+	}
1204	+	queuesiz = 0;
1205	+	}
1206	+
1207	+
1208	+	syserror(s)                     /* report error and exit */
1209	+	char    *s;
1210	+	{
1211	+	perror(s);
1212	+	exit(1);
1213		}

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