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root/radiance/src/px/pinterp.c

Comparing src/px/pinterp.c (file contents):
Revision 1.9 by greg, Wed Jan 3 12:52:30 1990 UTC vs.
Revision 2.37 by schorsch, Sun Jul 27 22:12:03 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	+	#define NSTEPS          64              /* number steps in overlap prescan */
46	+	#define MINSTEP         4               /* minimum worthwhile preview step */
47	+
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 */
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",
231	<	progname);
232	<	exit(1);
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		}
251		/* set view */
252	<	if (err = setview(&ourview)) {
253	<	fprintf(stderr, "%s: %s\n", progname, err);
252	>	if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
253	>	fprintf(stderr, "%s: no view on standard input!\n",
254	>	progname);
255		exit(1);
256		}
257	+	normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
258		/* allocate frame */
259	<	ourpict = (COLR *)calloc(ourview.hresolu*ourview.vresolu,sizeof(COLR));
260	<	ourzbuf = (float *)calloc(ourview.hresolu*ourview.vresolu,sizeof(float));
261	<	if (ourpict == NULL || ourzbuf == NULL) {
262	<	perror(progname);
263	<	exit(1);
259	>	if (doavg) {
260	>	ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
261	>	ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
262	>	if ((ourspict == NULL) | (ourweigh == NULL))
263	>	syserror(progname);
264	>	} else {
265	>	ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
266	>	if (ourpict == NULL)
267	>	syserror(progname);
268		}
269	<	/* get input */
270	<	for ( ; i < argc; i += 2)
271	<	addpicture(argv[i], argv[i+1]);
272	<	/* fill in spaces */
273	<	fillpicture();
269	>	if (doblur) {
270	>	ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
271	>	if (ourbpict == NULL)
272	>	syserror(progname);
273	>	}
274	>	ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
275	>	if (ourzbuf == NULL)
276	>	syserror(progname);
277	>	/* new header */
278	>	newheader("RADIANCE", stdout);
279	>	fputnow(stdout);
280	>	/* run pictures */
281	>	do {
282	>	memset((char *)ourzbuf, '\0', hresolu*vresolu*sizeof(float));
283	>	for (i = an; i < argc; i += 2)
284	>	addpicture(argv[i], argv[i+1]);
285	>	if (fillo&F_BACK)                       /* fill in spaces */
286	>	backpicture(fillfunc, fillsamp);
287	>	else
288	>	fillpicture(fillfunc);
289	>	/* aft clipping */
290	>	clipaft();
291	>	} while (addblur() && nextview(stdin) != EOF);
292	>	/* close calculation */
293	>	caldone();
294		/* add to header */
295		printargs(argc, argv, stdout);
296	<	if (gotvfile) {
297	<	printf(VIEWSTR);
298	<	fprintview(&ourview, stdout);
299	<	printf("\n");
296	>	compavgview();
297	>	if (doblur | gotvfile) {
298	>	fputs(VIEWSTR, stdout);
299	>	fprintview(&avgview, stdout);
300	>	putc('\n', stdout);
301		}
302	<	printf("\n");
303	<	/* write output */
302	>	if ((pixaspect < .99) | (pixaspect > 1.01))
303	>	fputaspect(pixaspect, stdout);
304	>	if (ourexp > 0)
305	>	ourexp *= rexpadj;
306	>	else
307	>	ourexp = rexpadj;
308	>	if ((ourexp < .995) | (ourexp > 1.005))
309	>	fputexpos(ourexp, stdout);
310	>	if (strcmp(ourfmt, PICFMT))             /* print format if known */
311	>	fputformat(ourfmt, 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
328
329	+	int
330		headline(s)                             /* process header string */
331		char    *s;
332		{
333	<	static char     *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL};
159	<	register char   **an;
333	>	char    fmt[32];
334
335	<	printf("\t%s", s);
336	<
337	<	for (an = altname; *an != NULL; an++)
338	<	if (!strncmp(*an, s, strlen(*an))) {
339	<	if (sscanview(&theirview, s+strlen(*an)) == 0)
340	<	gotview++;
341	<	break;
342	<	}
335	>	if (isheadid(s))
336	>	return(0);
337	>	if (formatval(fmt, s)) {
338	>	if (globmatch(ourfmt, fmt)) {
339	>	wrongformat = 0;
340	>	strcpy(ourfmt, fmt);
341	>	} else
342	>	wrongformat = 1;
343	>	return(0);
344	>	}
345	>	if (nvavg < 2) {
346	>	putc('\t', stdout);
347	>	fputs(s, stdout);
348	>	}
349	>	if (isexpos(s)) {
350	>	theirexp *= exposval(s);
351	>	return(0);
352	>	}
353	>	if (isview(s) && sscanview(&theirview, s) > 0)
354	>	gotview++;
355	>	return(0);
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;
362	>	char    linebuf[256];
363		char    *err;
364	<	COLR    *scanin;
365	<	float   *zin, *zlast;
366	<	int     *plast;
367	<	int     y;
368	<	/* open input files */
369	<	if ((pfp = fopen(pfile, "r")) == NULL) {
370	<	perror(pfile);
184	<	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	>	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	>	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	>	theirview = stdview;
439		gotview = 0;
440	<	getheader(pfp, headline);
441	<	if (!gotview || fgetresolu(&theirview.hresolu, &theirview.vresolu, pfp)
442	<	!= (YMAJOR|YDECR)) {
443	<	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	<	if (err = setview(&theirview)) {
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		/* compute transformation */
456	<	pixform(theirs2ours, &theirview, &ourview);
457	<	/* allocate scanlines */
458	<	scanin = (COLR *)malloc(theirview.hresolu*sizeof(COLR));
459	<	zin = (float *)malloc(theirview.hresolu*sizeof(float));
460	<	zlast = (float *)calloc(theirview.hresolu, sizeof(float));
461	<	plast = (int *)calloc(theirview.hresolu, sizeof(int));
462	<	if (scanin == NULL || zin == NULL || zlast == NULL || plast == NULL) {
463	<	perror(progname);
464	<	exit(1);
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 = theirview.vresolu-1; y >= 0; y--) {
471	<	if (freadcolrs(scanin, theirview.hresolu, 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((void *)zin);
475	>	free((void *)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), theirview.hresolu, zfp)
494	<	< theirview.hresolu) {
495	<	fprintf(stderr, "%s: read error\n", zfile);
493	>	if (zfd != -1 && lseek(zfd,
494	>	(off_t)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, plast, zlast);
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 *)scanin);
510	<	free((char *)zin);
511	<	free((char *)plast);
512	<	free((char *)zlast);
509	>	free((void *)xlim);
510	>	free((void *)scanin);
511	>	free((void *)zin);
512	>	free((void *)plast);
513		fclose(pfp);
514	<	fclose(zfp);
514	>	if (zfd != -1)
515	>	close(zfd);
516		}
517
518
519		pixform(xfmat, vw1, vw2)                /* compute view1 to view2 matrix */
520	<	register double xfmat[4][4];
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->vhinc[0];
531	<	xfmat[0][1] = vw1->vhinc[1];
532	<	xfmat[0][2] = vw1->vhinc[2];
533	<	xfmat[1][0] = vw1->vvinc[0];
534	<	xfmat[1][1] = vw1->vvinc[1];
535	<	xfmat[1][2] = vw1->vvinc[2];
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];
#	Line 254 | Line 540 | register VIEW  *vw1, *vw2;
540		xfmat[3][1] = vw1->vp[1];
541		xfmat[3][2] = vw1->vp[2];
542		setident4(m4t);
543	<	m4t[0][0] = vw2->vhinc[0]/vw2->vhn2;
544	<	m4t[1][0] = vw2->vhinc[1]/vw2->vhn2;
545	<	m4t[2][0] = vw2->vhinc[2]/vw2->vhn2;
546	<	m4t[3][0] = -DOT(vw2->vp,vw2->vhinc)/vw2->vhn2;
547	<	m4t[0][1] = vw2->vvinc[0]/vw2->vvn2;
548	<	m4t[1][1] = vw2->vvinc[1]/vw2->vvn2;
549	<	m4t[2][1] = vw2->vvinc[2]/vw2->vvn2;
550	<	m4t[3][1] = -DOT(vw2->vp,vw2->vvinc)/vw2->vvn2;
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(y, pline, zline, lasty, lastyz)     /* add scanline to output */
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	<	int     *lasty;                 /* input/output */
278	<	float   *lastyz;                /* input/output */
565	>	struct position *lasty;         /* input/output */
566		{
567	<	extern double   sqrt(), fabs();
568	<	double  pos[3];
569	<	int     lastx = 0;
283	<	double  lastxz = 0;
284	<	double  zt;
285	<	int     xpos, ypos;
567	>	FVECT   pos;
568	>	struct position lastx, newpos;
569	>	double  wt;
570		register int    x;
571
572	<	for (x = theirview.hresolu-1; x >= 0; x--) {
573	<	pos[0] = x - .5*(theirview.hresolu-1);
574	<	pos[1] = y - .5*(theirview.vresolu-1);
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;
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	+	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	+	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	+
676	+	if (pos[2] <= 0)                /* empty pixel */
677	+	return(0);
678	+	if (usematrix) {
679	+	pos[0] += theirview.hoff - .5;
680	+	pos[1] += theirview.voff - .5;
681	+	if (normdist & (theirview.type == VT_PER))
682	+	d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
683	+	+ pos[1]*pos[1]*theirview.vn2);
684	+	else
685	+	d = 1.;
686	+	pos[2] += d*theirview.vfore;
687		if (theirview.type == VT_PER) {
688	<	/*
294	<	* The following (single) statement can go
295	<	* if z is along the view direction rather
296	<	* than an eye ray.
297	<	*/
298	<	pos[2] /= sqrt( 1.
299	<	+ pos[0]*pos[0]*theirview.vhn2
300	<	+ pos[1]*pos[1]*theirview.vvn2 );
688	>	pos[2] /= d;
689		pos[0] *= pos[2];
690		pos[1] *= pos[2];
691		}
692		multp3(pos, pos, theirs2ours);
693	<	if (pos[2] <= 0)
694	<	continue;
693	>	if (pos[2] <= ourview.vfore)
694	>	return(0);
695		if (ourview.type == VT_PER) {
696		pos[0] /= pos[2];
697		pos[1] /= pos[2];
698		}
699	<	pos[0] += .5*ourview.hresolu;
700	<	pos[1] += .5*ourview.vresolu;
701	<	if (pos[0] < 0 || (xpos = pos[0]) >= ourview.hresolu
702	<	|| pos[1] < 0 || (ypos = pos[1]) >= ourview.vresolu)
703	<	continue;
704	<	/* add pixel to our image */
705	<	zt = 2.*zeps*zline[x];
706	<	addpixel(xpos, ypos,
707	<	(fabs(zline[x]-lastxz) <= zt) ? lastx - xpos : 1,
708	<	(fabs(zline[x]-lastyz[x]) <= zt) ? lasty[x] - ypos : 1,
709	<	pline[x], pos[2]);
710	<	lastx = xpos;
711	<	lasty[x] = ypos;
712	<	lastxz = lastyz[x] = zline[x];
699	>	pos[0] += .5 - ourview.hoff;
700	>	pos[1] += .5 - ourview.voff;
701	>	pos[2] -= ourview.vfore;
702	>	} else {
703	>	if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
704	>	return(0);
705	>	if ((!normdist) & (theirview.type == VT_PER))   /* adjust */
706	>	pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
707	>	+ pos[1]*pos[1]*theirview.vn2);
708	>	pt[0] += tdir[0]*pos[2];
709	>	pt[1] += tdir[1]*pos[2];
710	>	pt[2] += tdir[2]*pos[2];
711	>	viewloc(pos, &ourview, pt);
712	>	if (pos[2] <= 0)
713	>	return(0);
714		}
715	+	if ((pos[0] < 0) | (pos[0] >= 1-FTINY) | (pos[1] < 0) | (pos[1] >= 1-FTINY))
716	+	return(0);
717	+	if (!averaging)
718	+	return(1);
719	+	/* compute pixel weight */
720	+	if (ourview.type == VT_PAR) {
721	+	d = DOT(ourview.vdir,tdir);
722	+	d = 1. - d*d;
723	+	} else {
724	+	VSUB(odir, pt, ourview.vp);
725	+	d = DOT(odir,tdir);
726	+	d = 1. - d*d/DOT(odir,odir);
727	+	}
728	+	if (d <= 1./MAXWT/MAXWT)
729	+	return(MAXWT);          /* clip to maximum weight */
730	+	return(1./sqrt(d));
731		}
732
733
734	<	addpixel(xstart, ystart, width, height, pix, z) /* fill in area for pixel */
735	<	int     xstart, ystart;
736	<	int     width, height;
737	<	COLR    pix;
738	<	double  z;
734	>	getperim(xl, yl, zline, zfd)            /* compute overlapping image area */
735	>	register struct bound   *xl;
736	>	struct bound    *yl;
737	>	float   *zline;
738	>	int     zfd;
739		{
740	+	int     step;
741	+	FVECT   pos;
742		register int    x, y;
743	<	/* make width and height positive */
744	<	if (width < 0) {
745	<	width = -width;
746	<	xstart = xstart-width+1;
747	<	} else if (width == 0)
748	<	width = 1;
749	<	if (height < 0) {
750	<	height = -height;
751	<	ystart = ystart-height+1;
752	<	} else if (height == 0)
753	<	height = 1;
754	<	/* fill pixel(s) within rectangle */
755	<	for (y = ystart; y < ystart+height; y++)
756	<	for (x = xstart; x < xstart+width; x++)
757	<	if (zscan(y)[x] <= 0
758	<	|| zscan(y)[x]-z > zeps*zscan(y)[x]) {
759	<	zscan(y)[x] = z;
760	<	copycolr(pscan(y)[x], pix);
743	>	/* set up step size */
744	>	if (scanlen(&tresolu) < numscans(&tresolu))
745	>	step = scanlen(&tresolu)/NSTEPS;
746	>	else
747	>	step = numscans(&tresolu)/NSTEPS;
748	>	if (step < MINSTEP) {                   /* not worth cropping? */
749	>	yl->min = 0;
750	>	yl->max = numscans(&tresolu) - 1;
751	>	x = scanlen(&tresolu) - 1;
752	>	for (y = numscans(&tresolu); y--; ) {
753	>	xl[y].min = 0;
754	>	xl[y].max = x;
755	>	}
756	>	return(1);
757	>	}
758	>	yl->min = 32000; yl->max = 0;           /* search for points on image */
759	>	for (y = step - 1; y < numscans(&tresolu); y += step) {
760	>	if (zfd != -1) {
761	>	if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
762	>	0) < 0)
763	>	syserror("lseek");
764	>	if (read(zfd, (char *)zline,
765	>	scanlen(&tresolu)*sizeof(float))
766	>	< scanlen(&tresolu)*sizeof(float))
767	>	syserror("read");
768	>	}
769	>	xl[y].min = 32000; xl[y].max = 0;               /* x max */
770	>	for (x = scanlen(&tresolu); (x -= step) > 0; ) {
771	>	pix2loc(pos, &tresolu, x, y);
772	>	pos[2] = zline[x];
773	>	if (movepixel(pos) > FTINY) {
774	>	xl[y].max = x + step - 1;
775	>	xl[y].min = x - step + 1;       /* x min */
776	>	if (xl[y].min < 0)
777	>	xl[y].min = 0;
778	>	for (x = step - 1; x < xl[y].max; x += step) {
779	>	pix2loc(pos, &tresolu, x, y);
780	>	pos[2] = zline[x];
781	>	if (movepixel(pos) > FTINY) {
782	>	xl[y].min = x - step + 1;
783	>	break;
784	>	}
785	>	}
786	>	if (y < yl->min)                /* y limits */
787	>	yl->min = y - step + 1;
788	>	yl->max = y + step - 1;
789	>	break;
790		}
791	+	}
792	+	/* fill in between */
793	+	if (y < step) {
794	+	xl[y-1].min = xl[y].min;
795	+	xl[y-1].max = xl[y].max;
796	+	} else {
797	+	if (xl[y].min < xl[y-step].min)
798	+	xl[y-1].min = xl[y].min;
799	+	else
800	+	xl[y-1].min = xl[y-step].min;
801	+	if (xl[y].max > xl[y-step].max)
802	+	xl[y-1].max = xl[y].max;
803	+	else
804	+	xl[y-1].max = xl[y-step].max;
805	+	}
806	+	for (x = 2; x < step; x++)
807	+	*(xl+y-x) = *(xl+y-1);
808	+	}
809	+	if (yl->max >= numscans(&tresolu))
810	+	yl->max = numscans(&tresolu) - 1;
811	+	y -= step;
812	+	for (x = numscans(&tresolu) - 1; x > y; x--)    /* fill bottom rows */
813	+	*(xl+x) = *(xl+y);
814	+	return(yl->max >= yl->min);
815		}
816
817
818	<	fillpicture()                           /* fill in empty spaces */
818	>	backpicture(fill, samp)                 /* background fill algorithm */
819	>	int     (*fill)();
820	>	int     samp;
821		{
822		int     *yback, xback;
823		int     y;
362	–	COLR    pfill;
824		register int    x, i;
825		/* get back buffer */
826	<	yback = (int *)malloc(ourview.hresolu*sizeof(int));
827	<	if (yback == NULL) {
828	<	perror(progname);
829	<	return;
369	<	}
370	<	for (x = 0; x < ourview.hresolu; x++)
826	>	yback = (int *)malloc(hresolu*sizeof(int));
827	>	if (yback == NULL)
828	>	syserror(progname);
829	>	for (x = 0; x < hresolu; x++)
830		yback[x] = -2;
831		/*
832		* Xback and yback are the pixel locations of suitable
#	Line 376 | Line 835 | fillpicture()                          /* fill in empty spaces */
835		* that there is no suitable background in this direction.
836		*/
837		/* fill image */
838	<	for (y = 0; y < ourview.vresolu; y++) {
838	>	for (y = 0; y < vresolu; y++) {
839		xback = -2;
840	<	for (x = 0; x < ourview.hresolu; x++)
840	>	for (x = 0; x < hresolu; x++)
841		if (zscan(y)[x] <= 0) {         /* empty pixel */
842		/*
843		* First, find background from above or below.
844		* (farthest assigned pixel)
845		*/
846		if (yback[x] == -2) {
847	<	for (i = y+1; i < ourview.vresolu; i++)
847	>	for (i = y+1; i < vresolu; i++)
848		if (zscan(i)[x] > 0)
849		break;
850	<	if (i < ourview.vresolu
850	>	if (i < vresolu
851		&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
852		yback[x] = i;
853		else
#	Line 398 | Line 857 | fillpicture()                          /* fill in empty spaces */
857		* Next, find background from left or right.
858		*/
859		if (xback == -2) {
860	<	for (i = x+1; x < ourview.hresolu; i++)
860	>	for (i = x+1; i < hresolu; i++)
861		if (zscan(y)[i] > 0)
862		break;
863	<	if (i < ourview.hresolu
863	>	if (i < hresolu
864		&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
865		xback = i;
866		else
867		xback = x-1;
868		}
869	+	/*
870	+	* If we have no background for this pixel,
871	+	* use the given fill function.
872	+	*/
873		if (xback < 0 && yback[x] < 0)
874	<	continue;       /* no background */
874	>	goto fillit;
875		/*
876		* Compare, and use the background that is
877		* farther, unless one of them is next to us.
878	+	* If the background is too distant, call
879	+	* the fill function.
880		*/
881	<	if (yback[x] < 0 || ABS(x-xback) <= 1
881	>	if ( yback[x] < 0
882	>	|| (xback >= 0 && ABS(x-xback) <= 1)
883		|| ( ABS(y-yback[x]) > 1
884	<	&& zscan(yback[x])[x] < zscan(y)[xback] ))
885	<	copycolr(pscan(y)[x],pscan(y)[xback]);
886	<	else
887	<	copycolr(pscan(y)[x],pscan(yback[x])[x]);
884	>	&& zscan(yback[x])[x]
885	>	< zscan(y)[xback] ) ) {
886	>	if (samp > 0 && ABS(x-xback) >= samp)
887	>	goto fillit;
888	>	if (averaging) {
889	>	copycolor(sscan(y)[x],
890	>	sscan(y)[xback]);
891	>	wscan(y)[x] = wscan(y)[xback];
892	>	} else
893	>	copycolr(pscan(y)[x],
894	>	pscan(y)[xback]);
895	>	zscan(y)[x] = zscan(y)[xback];
896	>	} else {
897	>	if (samp > 0 && ABS(y-yback[x]) > samp)
898	>	goto fillit;
899	>	if (averaging) {
900	>	copycolor(sscan(y)[x],
901	>	sscan(yback[x])[x]);
902	>	wscan(y)[x] =
903	>	wscan(yback[x])[x];
904	>	} else
905	>	copycolr(pscan(y)[x],
906	>	pscan(yback[x])[x]);
907	>	zscan(y)[x] = zscan(yback[x])[x];
908	>	}
909	>	continue;
910	>	fillit:
911	>	(*fill)(x,y);
912	>	if (fill == rcalfill) {         /* use it */
913	>	clearqueue();
914	>	xback = x;
915	>	yback[x] = y;
916	>	}
917		} else {                                /* full pixel */
918		yback[x] = -2;
919		xback = -2;
920		}
921		}
922	<	free((char *)yback);
922	>	free((void *)yback);
923		}
924
925
926	<	writepicture()                          /* write out picture */
926	>	fillpicture(fill)               /* paint in empty pixels using fill */
927	>	int     (*fill)();
928		{
929	+	register int    x, y;
930	+
931	+	for (y = 0; y < vresolu; y++)
932	+	for (x = 0; x < hresolu; x++)
933	+	if (zscan(y)[x] <= 0)
934	+	(*fill)(x,y);
935	+	if (fill == rcalfill)
936	+	clearqueue();
937	+	}
938	+
939	+
940	+	clipaft()                       /* perform aft clipping as indicated */
941	+	{
942	+	register int    x, y;
943	+	int     adjtest = (ourview.type == VT_PER) & zisnorm;
944	+	double  tstdist;
945	+	double  yzn2, vx;
946	+
947	+	if (ourview.vaft <= FTINY)
948	+	return(0);
949	+	tstdist = ourview.vaft - ourview.vfore;
950	+	for (y = 0; y < vresolu; y++) {
951	+	if (adjtest) {                          /* adjust test */
952	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
953	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
954	+	tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
955	+	}
956	+	for (x = 0; x < hresolu; x++)
957	+	if (zscan(y)[x] > tstdist) {
958	+	if (adjtest) {
959	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
960	+	if (zscan(y)[x] <= (ourview.vaft -
961	+	ourview.vfore) *
962	+	sqrt(vx*vx*ourview.hn2 + yzn2))
963	+	continue;
964	+	}
965	+	if (averaging)
966	+	memset(sscan(y)[x], '\0', sizeof(COLOR));
967	+	else
968	+	memset(pscan(y)[x], '\0', sizeof(COLR));
969	+	zscan(y)[x] = 0.0;
970	+	}
971	+	}
972	+	return(1);
973	+	}
974	+
975	+
976	+	addblur()                               /* add to blurred picture */
977	+	{
978	+	COLOR   cval;
979	+	double  d;
980	+	register int    i;
981	+
982	+	if (!blurring)
983	+	return(0);
984	+	i = hresolu*vresolu;
985	+	if (nvavg < 2)
986	+	if (averaging)
987	+	while (i--) {
988	+	copycolor(ourbpict[i], ourspict[i]);
989	+	d = 1.0/ourweigh[i];
990	+	scalecolor(ourbpict[i], d);
991	+	}
992	+	else
993	+	while (i--)
994	+	colr_color(ourbpict[i], ourpict[i]);
995	+	else
996	+	if (averaging)
997	+	while (i--) {
998	+	copycolor(cval, ourspict[i]);
999	+	d = 1.0/ourweigh[i];
1000	+	scalecolor(cval, d);
1001	+	addcolor(ourbpict[i], cval);
1002	+	}
1003	+	else
1004	+	while (i--) {
1005	+	colr_color(cval, ourpict[i]);
1006	+	addcolor(ourbpict[i], cval);
1007	+	}
1008	+	/* print view */
1009	+	printf("VIEW%d:", nvavg);
1010	+	fprintview(&ourview, stdout);
1011	+	putchar('\n');
1012	+	return(1);
1013	+	}
1014	+
1015	+
1016	+	writepicture()                          /* write out picture (alters buffer) */
1017	+	{
1018		int     y;
1019	+	register int    x;
1020	+	double  d;
1021
1022	<	fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout);
1023	<	for (y = ourview.vresolu-1; y >= 0; y--)
1024	<	if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) {
1025	<	perror(progname);
1026	<	exit(1);
1022	>	fprtresolu(hresolu, vresolu, stdout);
1023	>	for (y = vresolu-1; y >= 0; y--)
1024	>	if (blurring) {
1025	>	for (x = 0; x < hresolu; x++) { /* compute avg. */
1026	>	d = rexpadj/nvavg;
1027	>	scalecolor(bscan(y)[x], d);
1028	>	}
1029	>	if (fwritescan(bscan(y), hresolu, stdout) < 0)
1030	>	syserror(progname);
1031	>	} else if (averaging) {
1032	>	for (x = 0; x < hresolu; x++) { /* average pixels */
1033	>	d = rexpadj/wscan(y)[x];
1034	>	scalecolor(sscan(y)[x], d);
1035	>	}
1036	>	if (fwritescan(sscan(y), hresolu, stdout) < 0)
1037	>	syserror(progname);
1038	>	} else {
1039	>	if (expadj)
1040	>	shiftcolrs(pscan(y), hresolu, expadj);
1041	>	if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1042	>	syserror(progname);
1043		}
1044	+	}
1045	+
1046	+
1047	+	writedistance(fname)                    /* write out z file (alters buffer) */
1048	+	char    *fname;
1049	+	{
1050	+	int     donorm = normdist & !zisnorm ? 1 :
1051	+	(ourview.type == VT_PER) & !normdist & zisnorm ? -1 : 0;
1052	+	int     fd;
1053	+	int     y;
1054	+
1055	+	if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1056	+	syserror(fname);
1057	+	for (y = vresolu-1; y >= 0; y--) {
1058	+	if (donorm) {
1059	+	double  vx, yzn2, d;
1060	+	register int    x;
1061	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1062	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1063	+	for (x = 0; x < hresolu; x++) {
1064	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
1065	+	d = sqrt(vx*vx*ourview.hn2 + yzn2);
1066	+	if (donorm > 0)
1067	+	zscan(y)[x] *= d;
1068	+	else
1069	+	zscan(y)[x] /= d;
1070	+	}
1071	+	}
1072	+	if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1073	+	< hresolu*sizeof(float))
1074	+	syserror(fname);
1075	+	}
1076	+	close(fd);
1077	+	}
1078	+
1079	+
1080	+	backfill(x, y)                          /* fill pixel with background */
1081	+	int     x, y;
1082	+	{
1083	+	if (averaging) {
1084	+	copycolor(sscan(y)[x], backcolor);
1085	+	wscan(y)[x] = 1;
1086	+	} else
1087	+	copycolr(pscan(y)[x], backcolr);
1088	+	zscan(y)[x] = backz;
1089	+	}
1090	+
1091	+
1092	+	calstart(prog, args)                    /* start fill calculation */
1093	+	char    *prog, *args;
1094	+	{
1095	+	char    combuf[512];
1096	+	char    *argv[64];
1097	+	int     rval;
1098	+	register char   **wp, *cp;
1099	+
1100	+	if (PDesc.running) {
1101	+	fprintf(stderr, "%s: too many calculations\n", progname);
1102	+	exit(1);
1103	+	}
1104	+	strcpy(combuf, prog);
1105	+	strcat(combuf, args);
1106	+	cp = combuf;
1107	+	wp = argv;
1108	+	for ( ; ; ) {
1109	+	while (isspace(*cp))    /* nullify spaces */
1110	+	*cp++ = '\0';
1111	+	if (!*cp)               /* all done? */
1112	+	break;
1113	+	*wp++ = cp;             /* add argument to list */
1114	+	while (*++cp && !isspace(*cp))
1115	+	;
1116	+	}
1117	+	*wp = NULL;
1118	+	/* start process */
1119	+	if ((rval = open_process(&PDesc, argv)) < 0)
1120	+	syserror(progname);
1121	+	if (rval == 0) {
1122	+	fprintf(stderr, "%s: command not found\n", argv[0]);
1123	+	exit(1);
1124	+	}
1125	+	packsiz = rval/(6*sizeof(float)) - 1;
1126	+	if (packsiz > PACKSIZ)
1127	+	packsiz = PACKSIZ;
1128	+	queuesiz = 0;
1129	+	}
1130	+
1131	+
1132	+	caldone()                               /* done with calculation */
1133	+	{
1134	+	if (!PDesc.running)
1135	+	return;
1136	+	clearqueue();
1137	+	close_process(&PDesc);
1138	+	}
1139	+
1140	+
1141	+	rcalfill(x, y)                          /* fill with ray-calculated pixel */
1142	+	int     x, y;
1143	+	{
1144	+	if (queuesiz >= packsiz)        /* flush queue if needed */
1145	+	clearqueue();
1146	+	/* add position to queue */
1147	+	queue[queuesiz][0] = x;
1148	+	queue[queuesiz][1] = y;
1149	+	queuesiz++;
1150	+	}
1151	+
1152	+
1153	+	clearqueue()                            /* process queue */
1154	+	{
1155	+	FVECT   orig, dir;
1156	+	float   fbuf[6*(PACKSIZ+1)];
1157	+	register float  *fbp;
1158	+	register int    i;
1159	+	double  vx, vy;
1160	+
1161	+	if (queuesiz == 0)
1162	+	return;
1163	+	fbp = fbuf;
1164	+	for (i = 0; i < queuesiz; i++) {
1165	+	viewray(orig, dir, &ourview,
1166	+	(queue[i][0]+.5)/hresolu,
1167	+	(queue[i][1]+.5)/vresolu);
1168	+	*fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1169	+	*fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1170	+	}
1171	+	/* mark end and get results */
1172	+	memset((char *)fbp, '\0', 6*sizeof(float));
1173	+	if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1174	+	4*sizeof(float)*(queuesiz+1),
1175	+	6*sizeof(float)*(queuesiz+1)) !=
1176	+	4*sizeof(float)*(queuesiz+1)) {
1177	+	fprintf(stderr, "%s: error reading from rtrace process\n",
1178	+	progname);
1179	+	exit(1);
1180	+	}
1181	+	fbp = fbuf;
1182	+	for (i = 0; i < queuesiz; i++) {
1183	+	if (ourexp > 0 && ourexp != 1.0) {
1184	+	fbp[0] *= ourexp;
1185	+	fbp[1] *= ourexp;
1186	+	fbp[2] *= ourexp;
1187	+	}
1188	+	if (averaging) {
1189	+	setcolor(sscan(queue[i][1])[queue[i][0]],
1190	+	fbp[0], fbp[1], fbp[2]);
1191	+	wscan(queue[i][1])[queue[i][0]] = 1;
1192	+	} else
1193	+	setcolr(pscan(queue[i][1])[queue[i][0]],
1194	+	fbp[0], fbp[1], fbp[2]);
1195	+	if (zisnorm)
1196	+	zscan(queue[i][1])[queue[i][0]] = fbp[3];
1197	+	else {
1198	+	vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1199	+	vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1200	+	zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1201	+	vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1202	+	}
1203	+	fbp += 4;
1204	+	}
1205	+	queuesiz = 0;
1206	+	}
1207	+
1208	+
1209	+	syserror(s)                     /* report error and exit */
1210	+	char    *s;
1211	+	{
1212	+	perror(s);
1213	+	exit(1);
1214		}

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