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

Comparing ray/src/px/pinterp.c (file contents):
Revision 1.2 by greg, Tue Dec 12 11:21:25 1989 UTC vs.
Revision 2.38 by greg, Mon Oct 20 16:01:55 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 "platform.h"
17	+	#include "rtprocess.h" /* Windows: must come before color.h */
18	+	#include "view.h"
19		#include "color.h"
20
21	<	#define pscan(y)        (ourpict+(y)*ourview.hresolu)
18	<	#define zscan(y)        (ourzbuf+(y)*ourview.hresolu)
21	>	#define LOG2            0.69314718055994530942
22
23	<	VIEW    ourview = STDVIEW(512);         /* desired view */
23	>	#define pscan(y)        (ourpict+(y)*hresolu)
24	>	#define sscan(y)        (ourspict+(y)*hresolu)
25	>	#define wscan(y)        (ourweigh+(y)*hresolu)
26	>	#define zscan(y)        (ourzbuf+(y)*hresolu)
27	>	#define bscan(y)        (ourbpict+(y)*hresolu)
28	>	#define averaging       (ourweigh != NULL)
29	>	#define blurring        (ourbpict != NULL)
30	>	#define usematrix       (hasmatrix & !averaging)
31	>	#define zisnorm         ((!usematrix) | (ourview.type != VT_PER))
32
33	<	double  zeps = 0.001;                   /* allowed z epsilon */
33	>	#define MAXWT           1000.           /* maximum pixel weight (averaging) */
34
35	<	COLR    *ourpict;                       /* output picture */
35	>	#define F_FORE          1               /* fill foreground */
36	>	#define F_BACK          2               /* fill background */
37	>
38	>	#define PACKSIZ         256             /* max. calculation packet size */
39	>
40	>	#define RTCOM           "rtrace -h- -ovl -fff -ld- -i- -I- "
41	>
42	>	#define ABS(x)          ((x)>0?(x):-(x))
43	>
44	>	struct position {int x,y; float z;};
45	>
46	>	#define NSTEPS          64              /* number steps in overlap prescan */
47	>	#define MINSTEP         4               /* minimum worthwhile preview step */
48	>
49	>	struct bound {int min,max;};
50	>
51	>	VIEW    ourview = STDVIEW;              /* desired view */
52	>	int     hresolu = 512;                  /* horizontal resolution */
53	>	int     vresolu = 512;                  /* vertical resolution */
54	>	double  pixaspect = 1.0;                /* pixel aspect ratio */
55	>
56	>	double  zeps = .02;                     /* allowed z epsilon */
57	>
58	>	COLR    *ourpict;                       /* output picture (COLR's) */
59	>	COLOR   *ourspict;                      /* output pixel sums (averaging) */
60	>	float   *ourweigh = NULL;               /* output pixel weights (averaging) */
61		float   *ourzbuf;                       /* corresponding z-buffer */
62	+	COLOR   *ourbpict = NULL;               /* blurred picture (view averaging) */
63
64	+	VIEW    avgview;                        /* average view for -B option */
65	+	int     nvavg;                          /* number of views averaged */
66	+
67		char    *progname;
68
69	<	VIEW    theirview = STDVIEW(512);       /* input view */
69	>	int     fillo = F_FORE|F_BACK;          /* selected fill options */
70	>	int     fillsamp = 0;                   /* sample separation (0 == inf) */
71	>	extern int      backfill(), rcalfill(); /* fill functions */
72	>	int     (*fillfunc)() = backfill;       /* selected fill function */
73	>	COLR    backcolr = BLKCOLR;             /* background color */
74	>	COLOR   backcolor = BLKCOLOR;           /* background color (float) */
75	>	double  backz = 0.0;                    /* background z value */
76	>	int     normdist = 1;                   /* i/o normalized distance? */
77	>	char    ourfmt[LPICFMT+1] = PICFMT;     /* original picture format */
78	>	double  ourexp = -1;                    /* original picture exposure */
79	>	int     expadj = 0;                     /* exposure adjustment (f-stops) */
80	>	double  rexpadj = 1;                    /* real exposure adjustment */
81	>
82	>	VIEW    theirview;                      /* input view */
83		int     gotview;                        /* got input view? */
84	+	int     wrongformat = 0;                /* input in another format? */
85	+	RESOLU  tresolu;                        /* input resolution */
86	+	double  theirexp;                       /* input picture exposure */
87	+	MAT4    theirs2ours;                    /* transformation matrix */
88	+	int     hasmatrix = 0;                  /* has transformation matrix */
89
90	+	static SUBPROC PDesc = SP_INACTIVE; /* rtrace process descriptor */
91	+	unsigned short  queue[PACKSIZ][2];      /* pending pixels */
92	+	int     packsiz;                        /* actual packet size */
93	+	int     queuesiz = 0;                   /* number of pixels pending */
94
95	+	extern double   movepixel();
96	+
97	+
98		main(argc, argv)                        /* interpolate pictures */
99		int     argc;
100		char    *argv[];
101		{
102	<	#define check(olen,narg)        if (argv[i][olen] || narg >= argc-i) goto badopt
102	>	#define  check(ol,al)           if (argv[an][ol] || \
103	>	badarg(argc-an-1,argv+an+1,al)) \
104	>	goto badopt
105		int     gotvfile = 0;
106	<	char    *err;
107	<	int     i;
106	>	int     doavg = -1;
107	>	int     doblur = 0;
108	>	char    *zfile = NULL;
109	>	char    *expcomp = NULL;
110	>	int     i, an, rval;
111
112		progname = argv[0];
113
114	<	for (i = 1; i < argc && argv[i][0] == '-'; i++)
115	<	switch (argv[i][1]) {
114	>	for (an = 1; an < argc && argv[an][0] == '-'; an++) {
115	>	rval = getviewopt(&ourview, argc-an, argv+an);
116	>	if (rval >= 0) {
117	>	an += rval;
118	>	continue;
119	>	}
120	>	switch (argv[an][1]) {
121	>	case 'e':                               /* exposure */
122	>	check(2,"f");
123	>	expcomp = argv[++an];
124	>	break;
125		case 't':                               /* threshold */
126	<	check(2,1);
127	<	zeps = atof(argv[++i]);
126	>	check(2,"f");
127	>	zeps = atof(argv[++an]);
128		break;
129	<	case 'v':                               /* view */
130	<	switch (argv[i][2]) {
131	<	case 't':                               /* type */
132	<	check(4,0);
133	<	ourview.type = argv[i][3];
129	>	case 'a':                               /* average */
130	>	check(2,NULL);
131	>	doavg = 1;
132	>	break;
133	>	case 'B':                               /* blur views */
134	>	check(2,NULL);
135	>	doblur = 1;
136	>	break;
137	>	case 'q':                               /* quick (no avg.) */
138	>	check(2,NULL);
139	>	doavg = 0;
140	>	break;
141	>	case 'n':                               /* dist. normalized? */
142	>	check(2,NULL);
143	>	normdist = !normdist;
144	>	break;
145	>	case 'f':                               /* fill type */
146	>	switch (argv[an][2]) {
147	>	case '0':                               /* none */
148	>	check(3,NULL);
149	>	fillo = 0;
150		break;
151	<	case 'p':                               /* point */
152	<	check(3,3);
153	<	ourview.vp[0] = atof(argv[++i]);
59	<	ourview.vp[1] = atof(argv[++i]);
60	<	ourview.vp[2] = atof(argv[++i]);
151	>	case 'f':                               /* foreground */
152	>	check(3,NULL);
153	>	fillo = F_FORE;
154		break;
155	<	case 'd':                               /* direction */
156	<	check(3,3);
157	<	ourview.vdir[0] = atof(argv[++i]);
65	<	ourview.vdir[1] = atof(argv[++i]);
66	<	ourview.vdir[2] = atof(argv[++i]);
155	>	case 'b':                               /* background */
156	>	check(3,NULL);
157	>	fillo = F_BACK;
158		break;
159	<	case 'u':                               /* up */
160	<	check(3,3);
161	<	ourview.vup[0] = atof(argv[++i]);
71	<	ourview.vup[1] = atof(argv[++i]);
72	<	ourview.vup[2] = atof(argv[++i]);
159	>	case 'a':                               /* all */
160	>	check(3,NULL);
161	>	fillo = F_FORE|F_BACK;
162		break;
163	<	case 'h':                               /* horizontal */
164	<	check(3,1);
165	<	ourview.horiz = atof(argv[++i]);
163	>	case 's':                               /* sample */
164	>	check(3,"i");
165	>	fillsamp = atoi(argv[++an]);
166		break;
167	<	case 'v':                               /* vertical */
168	<	check(3,1);
169	<	ourview.vert = atof(argv[++i]);
167	>	case 'c':                               /* color */
168	>	check(3,"fff");
169	>	fillfunc = backfill;
170	>	setcolor(backcolor, atof(argv[an+1]),
171	>	atof(argv[an+2]), atof(argv[an+3]));
172	>	setcolr(backcolr, colval(backcolor,RED),
173	>	colval(backcolor,GRN),
174	>	colval(backcolor,BLU));
175	>	an += 3;
176		break;
177	<	case 'f':                               /* file */
178	<	check(3,1);
179	<	gotvfile = viewfile(argv[++i], &ourview);
180	<	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	<	}
177	>	case 'z':                               /* z value */
178	>	check(3,"f");
179	>	fillfunc = backfill;
180	>	backz = atof(argv[++an]);
181		break;
182	+	case 'r':                               /* rtrace */
183	+	check(3,"s");
184	+	fillfunc = rcalfill;
185	+	calstart(RTCOM, argv[++an]);
186	+	break;
187		default:
188		goto badopt;
189		}
190		break;
191	+	case 'z':                               /* z file */
192	+	check(2,"s");
193	+	zfile = argv[++an];
194	+	break;
195	+	case 'x':                               /* x resolution */
196	+	check(2,"i");
197	+	hresolu = atoi(argv[++an]);
198	+	break;
199	+	case 'y':                               /* y resolution */
200	+	check(2,"i");
201	+	vresolu = atoi(argv[++an]);
202	+	break;
203	+	case 'p':                               /* pixel aspect */
204	+	if (argv[an][2] != 'a')
205	+	goto badopt;
206	+	check(3,"f");
207	+	pixaspect = atof(argv[++an]);
208	+	break;
209	+	case 'v':                               /* view file */
210	+	if (argv[an][2] != 'f')
211	+	goto badopt;
212	+	check(3,"s");
213	+	gotvfile = viewfile(argv[++an], &ourview, NULL);
214	+	if (gotvfile < 0)
215	+	syserror(argv[an]);
216	+	else if (gotvfile == 0) {
217	+	fprintf(stderr, "%s: bad view file\n",
218	+	argv[an]);
219	+	exit(1);
220	+	}
221	+	break;
222		default:
223		badopt:
224	<	fprintf(stderr, "%s: unknown option '%s'\n",
225	<	progname, argv[i]);
226	<	exit(1);
224	>	fprintf(stderr, "%s: command line error at '%s'\n",
225	>	progname, argv[an]);
226	>	goto userr;
227		}
228	+	}
229		/* check arguments */
230	<	if (argc-i < 2 || (argc-i)%2) {
231	<	fprintf(stderr, "Usage: %s [view args] pfile zfile ..\n",
232	<	progname);
233	<	exit(1);
230	>	if ((argc-an)%2)
231	>	goto userr;
232	>	if (fillsamp == 1)
233	>	fillo &= ~F_BACK;
234	>	if (doavg < 0)
235	>	doavg = (argc-an) > 2;
236	>	if (expcomp != NULL) {
237	>	if ((expcomp[0] == '+') | (expcomp[0] == '-')) {
238	>	expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
239	>	if (doavg | doblur)
240	>	rexpadj = pow(2.0, atof(expcomp));
241	>	else
242	>	rexpadj = pow(2.0, (double)expadj);
243	>	} else {
244	>	if (!isflt(expcomp))
245	>	goto userr;
246	>	rexpadj = atof(expcomp);
247	>	expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
248	>	if (!(doavg | doblur))
249	>	rexpadj = pow(2.0, (double)expadj);
250	>	}
251		}
252		/* set view */
253	<	if (err = setview(&ourview)) {
254	<	fprintf(stderr, "%s: %s\n", progname, err);
253	>	if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
254	>	fprintf(stderr, "%s: no view on standard input!\n",
255	>	progname);
256		exit(1);
257		}
258	+	normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
259		/* allocate frame */
260	<	ourpict = (COLR *)calloc(ourview.hresolu*ourview.vresolu,sizeof(COLR));
261	<	ourzbuf = (float *)calloc(ourview.hresolu*ourview.vresolu,sizeof(float));
262	<	if (ourpict == NULL || ourzbuf == NULL) {
263	<	perror(progname);
264	<	exit(1);
260	>	if (doavg) {
261	>	ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
262	>	ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
263	>	if ((ourspict == NULL) | (ourweigh == NULL))
264	>	syserror(progname);
265	>	} else {
266	>	ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
267	>	if (ourpict == NULL)
268	>	syserror(progname);
269		}
270	<	/* get input */
271	<	for ( ; i < argc; i += 2)
272	<	addpicture(argv[i], argv[i+1]);
273	<	/* fill in spaces */
274	<	fillpicture();
270	>	if (doblur) {
271	>	ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
272	>	if (ourbpict == NULL)
273	>	syserror(progname);
274	>	}
275	>	ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
276	>	if (ourzbuf == NULL)
277	>	syserror(progname);
278	>	/* new header */
279	>	newheader("RADIANCE", stdout);
280	>	fputnow(stdout);
281	>	/* run pictures */
282	>	do {
283	>	memset((char *)ourzbuf, '\0', 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	>	if (strcmp(ourfmt, PICFMT))             /* print format if known */
312	>	fputformat(ourfmt, stdout);
313	>	putc('\n', stdout);
314	>	/* write picture */
315		writepicture();
316	+	/* write z file */
317	+	if (zfile != NULL)
318	+	writedistance(zfile);
319
320		exit(0);
321	+	userr:
322	+	fprintf(stderr,
323	+	"Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
324	+	progname);
325	+	exit(1);
326		#undef check
327		}
328
329
330	+	int
331		headline(s)                             /* process header string */
332		char    *s;
333		{
334	<	static char     *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL};
147	<	register char   **an;
334	>	char    fmt[32];
335
336	<	printf("\t%s", s);
337	<
338	<	for (an = altname; *an != NULL; an++)
339	<	if (!strncmp(*an, s, strlen(*an))) {
340	<	if (sscanview(&theirview, s+strlen(*an)) == 0)
341	<	gotview++;
342	<	break;
343	<	}
336	>	if (isheadid(s))
337	>	return(0);
338	>	if (formatval(fmt, s)) {
339	>	if (globmatch(ourfmt, fmt)) {
340	>	wrongformat = 0;
341	>	strcpy(ourfmt, fmt);
342	>	} else
343	>	wrongformat = 1;
344	>	return(0);
345	>	}
346	>	if (nvavg < 2) {
347	>	putc('\t', stdout);
348	>	fputs(s, stdout);
349	>	}
350	>	if (isexpos(s)) {
351	>	theirexp *= exposval(s);
352	>	return(0);
353	>	}
354	>	if (isview(s) && sscanview(&theirview, s) > 0)
355	>	gotview++;
356	>	return(0);
357		}
358
359
360	<	addpicture(pfile, zfile)                /* add picture to output */
361	<	char    *pfile, *zfile;
360	>	nextview(fp)                            /* get and set next view */
361	>	FILE    *fp;
362		{
363	<	FILE    *pfp, *zfp;
164	<	COLR    *scanin;
165	<	float   *zin;
363	>	char    linebuf[256];
364		char    *err;
365	<	int     xres, yres;
366	<	int     y;
367	<	/* open input files */
368	<	if ((pfp = fopen(pfile, "r")) == NULL) {
369	<	perror(pfile);
370	<	exit(1);
365	>	register int    i;
366	>
367	>	if (fp != NULL) {
368	>	do                      /* get new view */
369	>	if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
370	>	return(EOF);
371	>	while (!isview(linebuf) || !sscanview(&ourview, linebuf));
372		}
373	<	if ((zfp = fopen(zfile, "r")) == NULL) {
374	<	perror(zfile);
373	>	/* set new view */
374	>	if ((err = setview(&ourview)) != NULL) {
375	>	fprintf(stderr, "%s: %s\n", progname, err);
376		exit(1);
377		}
378	<	/* get header and view */
379	<	printf("%s:\n", pfile);
378	>	if (!nvavg) {                   /* first view */
379	>	avgview = ourview;
380	>	return(nvavg++);
381	>	}
382	>	/* add to average view */
383	>	for (i = 0; i < 3; i++) {
384	>	avgview.vp[i] += ourview.vp[i];
385	>	avgview.vdir[i] += ourview.vdir[i];
386	>	avgview.vup[i] += ourview.vup[i];
387	>	}
388	>	avgview.horiz += ourview.horiz;
389	>	avgview.vert += ourview.vert;
390	>	avgview.hoff += ourview.hoff;
391	>	avgview.voff += ourview.voff;
392	>	avgview.vfore += ourview.vfore;
393	>	avgview.vaft += ourview.vaft;
394	>	return(nvavg++);
395	>	}
396	>
397	>
398	>	compavgview()                           /* compute average view */
399	>	{
400	>	register int    i;
401	>	double  f;
402	>
403	>	if (nvavg < 2)
404	>	return;
405	>	f = 1.0/nvavg;
406	>	for (i = 0; i < 3; i++) {
407	>	avgview.vp[i] *= f;
408	>	avgview.vdir[i] *= f;
409	>	avgview.vup[i] *= f;
410	>	}
411	>	avgview.horiz *= f;
412	>	avgview.vert *= f;
413	>	avgview.hoff *= f;
414	>	avgview.voff *= f;
415	>	avgview.vfore *= f;
416	>	avgview.vaft *= f;
417	>	if (setview(&avgview) != NULL)          /* in case of emergency... */
418	>	avgview = ourview;
419	>	pixaspect = viewaspect(&avgview) * hresolu / vresolu;
420	>	}
421	>
422	>
423	>	addpicture(pfile, zspec)                /* add picture to output */
424	>	char    *pfile, *zspec;
425	>	{
426	>	FILE    *pfp;
427	>	int     zfd;
428	>	char    *err;
429	>	COLR    *scanin;
430	>	float   *zin;
431	>	struct position *plast;
432	>	struct bound    *xlim, ylim;
433	>	int     y;
434	>	/* open picture file */
435	>	if ((pfp = fopen(pfile, "r")) == NULL)
436	>	syserror(pfile);
437	>	/* get header with exposure and view */
438	>	theirexp = 1.0;
439	>	theirview = stdview;
440		gotview = 0;
441	<	getheader(pfp, headline);
442	<	if (!gotview || fgetresolu(&xres, &yres, pfp) != (YMAJOR|YDECR)) {
443	<	fprintf(stderr, "%s: picture view error\n", pfile);
441	>	if (nvavg < 2)
442	>	printf("%s:\n", pfile);
443	>	getheader(pfp, headline, NULL);
444	>	if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
445	>	fprintf(stderr, "%s: picture format error\n", pfile);
446		exit(1);
447		}
448	<	theirview.hresolu = xres;
449	<	theirview.vresolu = yres;
450	<	if (err = setview(&theirview)) {
448	>	if (ourexp <= 0)
449	>	ourexp = theirexp;
450	>	else if (ABS(theirexp-ourexp) > .01*ourexp)
451	>	fprintf(stderr, "%s: different exposure (warning)\n", pfile);
452	>	if ( (err = setview(&theirview)) ) {
453		fprintf(stderr, "%s: %s\n", pfile, err);
454		exit(1);
455		}
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);
456	>	/* compute transformation */
457	>	hasmatrix = pixform(theirs2ours, &theirview, &ourview);
458	>	/* get z specification or file */
459	>	zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
460	>	if (zin == NULL)
461	>	syserror(progname);
462	>	if ((zfd = open(zspec, O_RDONLY)) == -1) {
463	>	double  zvalue;
464	>	register int    x;
465	>	if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
466	>	syserror(zspec);
467	>	for (x = scanlen(&tresolu); x-- > 0; )
468	>	zin[x] = zvalue;
469		}
470	<	/* load image */
471	<	for (y = yres-1; y >= 0; y--) {
472	<	if (freadcolrs(scanin, xres, pfp) < 0) {
470	>	/* compute transferrable perimeter */
471	>	xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
472	>	if (xlim == NULL)
473	>	syserror(progname);
474	>	if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
475	>	free((void *)zin);
476	>	free((void *)xlim);
477	>	if (zfd != -1)
478	>	close(zfd);
479	>	fclose(pfp);
480	>	return;
481	>	}
482	>	/* allocate scanlines */
483	>	scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
484	>	plast = (struct position *)calloc(scanlen(&tresolu),
485	>	sizeof(struct position));
486	>	if ((scanin == NULL) | (plast == NULL))
487	>	syserror(progname);
488	>	/* skip to starting point */
489	>	for (y = 0; y < ylim.min; y++)
490	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
491		fprintf(stderr, "%s: read error\n", pfile);
492		exit(1);
493		}
494	<	if (fread(zin, sizeof(float), xres, zfp) < xres) {
495	<	fprintf(stderr, "%s: read error\n", zfile);
494	>	if (zfd != -1 && lseek(zfd,
495	>	(off_t)ylim.min*scanlen(&tresolu)*sizeof(float),
496	>	SEEK_SET) < 0)
497	>	syserror(zspec);
498	>	/* load image */
499	>	for (y = ylim.min; y <= ylim.max; y++) {
500	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
501	>	fprintf(stderr, "%s: read error\n", pfile);
502		exit(1);
503		}
504	<	addscanline(y, scanin, zin);
504	>	if (zfd != -1 && read(zfd, (char *)zin,
505	>	scanlen(&tresolu)*sizeof(float))
506	>	< scanlen(&tresolu)*sizeof(float))
507	>	syserror(zspec);
508	>	addscanline(xlim+y, y, scanin, zin, plast);
509		}
510		/* clean up */
511	<	free((char *)scanin);
512	<	free((char *)zin);
511	>	free((void *)xlim);
512	>	free((void *)scanin);
513	>	free((void *)zin);
514	>	free((void *)plast);
515		fclose(pfp);
516	<	fclose(zfp);
516	>	if (zfd != -1)
517	>	close(zfd);
518		}
519
520
521	<	addscanline(y, pline, zline)            /* add scanline to output */
521	>	pixform(xfmat, vw1, vw2)                /* compute view1 to view2 matrix */
522	>	register MAT4   xfmat;
523	>	register VIEW   *vw1, *vw2;
524	>	{
525	>	double  m4t[4][4];
526	>
527	>	if ((vw1->type != VT_PER) & (vw1->type != VT_PAR))
528	>	return(0);
529	>	if ((vw2->type != VT_PER) & (vw2->type != VT_PAR))
530	>	return(0);
531	>	setident4(xfmat);
532	>	xfmat[0][0] = vw1->hvec[0];
533	>	xfmat[0][1] = vw1->hvec[1];
534	>	xfmat[0][2] = vw1->hvec[2];
535	>	xfmat[1][0] = vw1->vvec[0];
536	>	xfmat[1][1] = vw1->vvec[1];
537	>	xfmat[1][2] = vw1->vvec[2];
538	>	xfmat[2][0] = vw1->vdir[0];
539	>	xfmat[2][1] = vw1->vdir[1];
540	>	xfmat[2][2] = vw1->vdir[2];
541	>	xfmat[3][0] = vw1->vp[0];
542	>	xfmat[3][1] = vw1->vp[1];
543	>	xfmat[3][2] = vw1->vp[2];
544	>	setident4(m4t);
545	>	m4t[0][0] = vw2->hvec[0]/vw2->hn2;
546	>	m4t[1][0] = vw2->hvec[1]/vw2->hn2;
547	>	m4t[2][0] = vw2->hvec[2]/vw2->hn2;
548	>	m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
549	>	m4t[0][1] = vw2->vvec[0]/vw2->vn2;
550	>	m4t[1][1] = vw2->vvec[1]/vw2->vn2;
551	>	m4t[2][1] = vw2->vvec[2]/vw2->vn2;
552	>	m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
553	>	m4t[0][2] = vw2->vdir[0];
554	>	m4t[1][2] = vw2->vdir[1];
555	>	m4t[2][2] = vw2->vdir[2];
556	>	m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
557	>	multmat4(xfmat, xfmat, m4t);
558	>	return(1);
559	>	}
560	>
561	>
562	>	addscanline(xl, y, pline, zline, lasty) /* add scanline to output */
563	>	struct bound    *xl;
564		int     y;
565		COLR    *pline;
566		float   *zline;
567	+	struct position *lasty;         /* input/output */
568		{
569	<	FVECT   p, dir;
570	<	double  xnew, ynew, znew;
569	>	FVECT   pos;
570	>	struct position lastx, newpos;
571	>	double  wt;
572		register int    x;
227	–	register int    xpos, ypos;
573
574	<	for (x = 0; x < theirview.hresolu; x++) {
575	<	rayview(p, dir, &theirview, x+.5, y+.5);
576	<	p[0] += zline[x]*dir[0];
577	<	p[1] += zline[x]*dir[1];
578	<	p[2] += zline[x]*dir[2];
579	<	pixelview(&xnew, &ynew, &znew, &ourview, p);
235	<	if (znew <= 0.0 || xnew < 0 || xnew > ourview.hresolu
236	<	|| ynew < 0 || ynew > ourview.vresolu)
574	>	lastx.z = 0;
575	>	for (x = xl->max; x >= xl->min; x--) {
576	>	pix2loc(pos, &tresolu, x, y);
577	>	pos[2] = zline[x];
578	>	if ((wt = movepixel(pos)) <= FTINY) {
579	>	lasty[x].z = lastx.z = 0;       /* mark invalid */
580		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]);
581		}
582	+	/* add pixel to our image */
583	+	newpos.x = pos[0] * hresolu;
584	+	newpos.y = pos[1] * vresolu;
585	+	newpos.z = zline[x];
586	+	addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
587	+	lasty[x].x = lastx.x = newpos.x;
588	+	lasty[x].y = lastx.y = newpos.y;
589	+	lasty[x].z = lastx.z = newpos.z;
590		}
591		}
592
593
594	<	fillpicture()                           /* fill in empty spaces */
594	>	addpixel(p0, p1, p2, pix, w, z)         /* fill in pixel parallelogram */
595	>	struct position *p0, *p1, *p2;
596	>	COLR    pix;
597	>	double  w;
598	>	double  z;
599		{
600	+	double  zt = 2.*zeps*p0->z;             /* threshold */
601	+	COLOR   pval;                           /* converted+weighted pixel */
602	+	int     s1x, s1y, s2x, s2y;             /* step sizes */
603	+	int     l1, l2, c1, c2;                 /* side lengths and counters */
604	+	int     p1isy;                          /* p0p1 along y? */
605	+	int     x1, y1;                         /* p1 position */
606	+	register int    x, y;                   /* final position */
607	+
608	+	/* compute vector p0p1 */
609	+	if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
610	+	s1x = p1->x - p0->x;
611	+	s1y = p1->y - p0->y;
612	+	l1 = ABS(s1x);
613	+	if ( (p1isy = (ABS(s1y) > l1)) )
614	+	l1 = ABS(s1y);
615	+	else if (l1 < 1)
616	+	l1 = 1;
617	+	} else {
618	+	l1 = s1x = s1y = 1;
619	+	p1isy = -1;
620	+	}
621	+	/* compute vector p0p2 */
622	+	if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
623	+	s2x = p2->x - p0->x;
624	+	s2y = p2->y - p0->y;
625	+	if (p1isy == 1)
626	+	l2 = ABS(s2x);
627	+	else {
628	+	l2 = ABS(s2y);
629	+	if (p1isy != 0 && ABS(s2x) > l2)
630	+	l2 = ABS(s2x);
631	+	}
632	+	if (l2 < 1)
633	+	l2 = 1;
634	+	} else
635	+	l2 = s2x = s2y = 1;
636	+	/* fill the parallelogram */
637	+	if (averaging) {
638	+	colr_color(pval, pix);
639	+	scalecolor(pval, w);
640	+	}
641	+	for (c1 = l1; c1-- > 0; ) {
642	+	x1 = p0->x + c1*s1x/l1;
643	+	y1 = p0->y + c1*s1y/l1;
644	+	for (c2 = l2; c2-- > 0; ) {
645	+	x = x1 + c2*s2x/l2;
646	+	if ((x < 0) | (x >= hresolu))
647	+	continue;
648	+	y = y1 + c2*s2y/l2;
649	+	if ((y < 0) | (y >= vresolu))
650	+	continue;
651	+	if (averaging) {
652	+	if (zscan(y)[x] <= 0 || zscan(y)[x]-z
653	+	> zeps*zscan(y)[x]) {
654	+	copycolor(sscan(y)[x], pval);
655	+	wscan(y)[x] = w;
656	+	zscan(y)[x] = z;
657	+	} else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
658	+	addcolor(sscan(y)[x], pval);
659	+	wscan(y)[x] += w;
660	+	}
661	+	} else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
662	+	> zeps*zscan(y)[x]) {
663	+	copycolr(pscan(y)[x], pix);
664	+	zscan(y)[x] = z;
665	+	}
666	+	}
667	+	}
668	+	}
669	+
670	+
671	+	double
672	+	movepixel(pos)                          /* reposition image point */
673	+	register FVECT  pos;
674	+	{
675	+	FVECT   pt, tdir, odir;
676	+	double  d;
677	+
678	+	if (pos[2] <= 0)                /* empty pixel */
679	+	return(0);
680	+	if (usematrix) {
681	+	pos[0] += theirview.hoff - .5;
682	+	pos[1] += theirview.voff - .5;
683	+	if (normdist & (theirview.type == VT_PER))
684	+	d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
685	+	+ pos[1]*pos[1]*theirview.vn2);
686	+	else
687	+	d = 1.;
688	+	pos[2] += d*theirview.vfore;
689	+	if (theirview.type == VT_PER) {
690	+	pos[2] /= d;
691	+	pos[0] *= pos[2];
692	+	pos[1] *= pos[2];
693	+	}
694	+	multp3(pos, pos, theirs2ours);
695	+	if (pos[2] <= ourview.vfore)
696	+	return(0);
697	+	if (ourview.type == VT_PER) {
698	+	pos[0] /= pos[2];
699	+	pos[1] /= pos[2];
700	+	}
701	+	pos[0] += .5 - ourview.hoff;
702	+	pos[1] += .5 - ourview.voff;
703	+	pos[2] -= ourview.vfore;
704	+	} else {
705	+	if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
706	+	return(0);
707	+	if ((!normdist) & (theirview.type == VT_PER))   /* adjust */
708	+	pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
709	+	+ pos[1]*pos[1]*theirview.vn2);
710	+	pt[0] += tdir[0]*pos[2];
711	+	pt[1] += tdir[1]*pos[2];
712	+	pt[2] += tdir[2]*pos[2];
713	+	viewloc(pos, &ourview, pt);
714	+	if (pos[2] <= 0)
715	+	return(0);
716	+	}
717	+	if ((pos[0] < 0) | (pos[0] >= 1-FTINY) | (pos[1] < 0) | (pos[1] >= 1-FTINY))
718	+	return(0);
719	+	if (!averaging)
720	+	return(1);
721	+	/* compute pixel weight */
722	+	if (ourview.type == VT_PAR) {
723	+	d = DOT(ourview.vdir,tdir);
724	+	d = 1. - d*d;
725	+	} else {
726	+	VSUB(odir, pt, ourview.vp);
727	+	d = DOT(odir,tdir);
728	+	d = 1. - d*d/DOT(odir,odir);
729	+	}
730	+	if (d <= 1./MAXWT/MAXWT)
731	+	return(MAXWT);          /* clip to maximum weight */
732	+	return(1./sqrt(d));
733	+	}
734	+
735	+
736	+	getperim(xl, yl, zline, zfd)            /* compute overlapping image area */
737	+	register struct bound   *xl;
738	+	struct bound    *yl;
739	+	float   *zline;
740	+	int     zfd;
741	+	{
742	+	int     step;
743	+	FVECT   pos;
744	+	register int    x, y;
745	+	/* set up step size */
746	+	if (scanlen(&tresolu) < numscans(&tresolu))
747	+	step = scanlen(&tresolu)/NSTEPS;
748	+	else
749	+	step = numscans(&tresolu)/NSTEPS;
750	+	if (step < MINSTEP) {                   /* not worth cropping? */
751	+	yl->min = 0;
752	+	yl->max = numscans(&tresolu) - 1;
753	+	x = scanlen(&tresolu) - 1;
754	+	for (y = numscans(&tresolu); y--; ) {
755	+	xl[y].min = 0;
756	+	xl[y].max = x;
757	+	}
758	+	return(1);
759	+	}
760	+	yl->min = 32000; yl->max = 0;           /* search for points on image */
761	+	for (y = step - 1; y < numscans(&tresolu); y += step) {
762	+	if (zfd != -1) {
763	+	if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
764	+	SEEK_SET) < 0)
765	+	syserror("lseek");
766	+	if (read(zfd, (char *)zline,
767	+	scanlen(&tresolu)*sizeof(float))
768	+	< scanlen(&tresolu)*sizeof(float))
769	+	syserror("read");
770	+	}
771	+	xl[y].min = 32000; xl[y].max = 0;               /* x max */
772	+	for (x = scanlen(&tresolu); (x -= step) > 0; ) {
773	+	pix2loc(pos, &tresolu, x, y);
774	+	pos[2] = zline[x];
775	+	if (movepixel(pos) > FTINY) {
776	+	xl[y].max = x + step - 1;
777	+	xl[y].min = x - step + 1;       /* x min */
778	+	if (xl[y].min < 0)
779	+	xl[y].min = 0;
780	+	for (x = step - 1; x < xl[y].max; x += step) {
781	+	pix2loc(pos, &tresolu, x, y);
782	+	pos[2] = zline[x];
783	+	if (movepixel(pos) > FTINY) {
784	+	xl[y].min = x - step + 1;
785	+	break;
786	+	}
787	+	}
788	+	if (y < yl->min)                /* y limits */
789	+	yl->min = y - step + 1;
790	+	yl->max = y + step - 1;
791	+	break;
792	+	}
793	+	}
794	+	/* fill in between */
795	+	if (y < step) {
796	+	xl[y-1].min = xl[y].min;
797	+	xl[y-1].max = xl[y].max;
798	+	} else {
799	+	if (xl[y].min < xl[y-step].min)
800	+	xl[y-1].min = xl[y].min;
801	+	else
802	+	xl[y-1].min = xl[y-step].min;
803	+	if (xl[y].max > xl[y-step].max)
804	+	xl[y-1].max = xl[y].max;
805	+	else
806	+	xl[y-1].max = xl[y-step].max;
807	+	}
808	+	for (x = 2; x < step; x++)
809	+	*(xl+y-x) = *(xl+y-1);
810	+	}
811	+	if (yl->max >= numscans(&tresolu))
812	+	yl->max = numscans(&tresolu) - 1;
813	+	y -= step;
814	+	for (x = numscans(&tresolu) - 1; x > y; x--)    /* fill bottom rows */
815	+	*(xl+x) = *(xl+y);
816	+	return(yl->max >= yl->min);
817	+	}
818	+
819	+
820	+	backpicture(fill, samp)                 /* background fill algorithm */
821	+	int     (*fill)();
822	+	int     samp;
823	+	{
824		int     *yback, xback;
825		int     y;
255	–	COLR    pfill;
826		register int    x, i;
827		/* get back buffer */
828	<	yback = (int *)malloc(ourview.hresolu*sizeof(int));
829	<	if (yback == NULL) {
830	<	perror(progname);
831	<	return;
832	<	}
833	<	for (x = 0; x < ourview.hresolu; x++)
834	<	yback[x] = -1;
828	>	yback = (int *)malloc(hresolu*sizeof(int));
829	>	if (yback == NULL)
830	>	syserror(progname);
831	>	for (x = 0; x < hresolu; x++)
832	>	yback[x] = -2;
833	>	/*
834	>	* Xback and yback are the pixel locations of suitable
835	>	* background values in each direction.
836	>	* A value of -2 means unassigned, and -1 means
837	>	* that there is no suitable background in this direction.
838	>	*/
839		/* fill image */
840	<	for (y = 0; y < ourview.vresolu; y++)
841	<	for (x = 0; x < ourview.hresolu; x++)
842	<	if (zscan(y)[x] <= 0.0) {       /* found hole */
843	<	xback = x-1;
844	<	do {                    /* find boundary */
845	<	if (yback[x] < 0) {
846	<	for (i = y+1;
847	<	i < ourview.vresolu;
848	<	i++)
849	<	if (zscan(i)[x] > 0.0)
850	<	break;
851	<	if (i < ourview.vresolu
840	>	for (y = 0; y < vresolu; y++) {
841	>	xback = -2;
842	>	for (x = 0; x < hresolu; x++)
843	>	if (zscan(y)[x] <= 0) {         /* empty pixel */
844	>	/*
845	>	* First, find background from above or below.
846	>	* (farthest assigned pixel)
847	>	*/
848	>	if (yback[x] == -2) {
849	>	for (i = y+1; i < vresolu; i++)
850	>	if (zscan(i)[x] > 0)
851	>	break;
852	>	if (i < vresolu
853		&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
854	<	yback[x] = i;
855	<	else
856	<	yback[x] = y-1;
857	<	}
858	<	} while (++x < ourview.hresolu
859	<	&& zscan(y)[x] <= 0.0);
860	<	i = xback;              /* pick background */
861	<	if (x < ourview.hresolu
862	<	&& (i < 0 || zscan(y)[i] < zscan(y)[x]))
863	<	xback = x;
864	<	/* fill hole */
865	<	if (xback < 0) {
866	<	while (++i < x)
867	<	if (yback[i] >= 0)
868	<	copycolr(pscan(y)[i],pscan(yback[i])[i]);
854	>	yback[x] = i;
855	>	else
856	>	yback[x] = y-1;
857	>	}
858	>	/*
859	>	* Next, find background from left or right.
860	>	*/
861	>	if (xback == -2) {
862	>	for (i = x+1; i < hresolu; i++)
863	>	if (zscan(y)[i] > 0)
864	>	break;
865	>	if (i < hresolu
866	>	&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
867	>	xback = i;
868	>	else
869	>	xback = x-1;
870	>	}
871	>	/*
872	>	* If we have no background for this pixel,
873	>	* use the given fill function.
874	>	*/
875	>	if (xback < 0 && yback[x] < 0)
876	>	goto fillit;
877	>	/*
878	>	* Compare, and use the background that is
879	>	* farther, unless one of them is next to us.
880	>	* If the background is too distant, call
881	>	* the fill function.
882	>	*/
883	>	if ( yback[x] < 0
884	>	|| (xback >= 0 && ABS(x-xback) <= 1)
885	>	|| ( ABS(y-yback[x]) > 1
886	>	&& zscan(yback[x])[x]
887	>	< zscan(y)[xback] ) ) {
888	>	if (samp > 0 && ABS(x-xback) >= samp)
889	>	goto fillit;
890	>	if (averaging) {
891	>	copycolor(sscan(y)[x],
892	>	sscan(y)[xback]);
893	>	wscan(y)[x] = wscan(y)[xback];
894	>	} else
895	>	copycolr(pscan(y)[x],
896	>	pscan(y)[xback]);
897	>	zscan(y)[x] = zscan(y)[xback];
898		} else {
899	<	while (++i < x)
900	<	if (yback[i] < 0 ||
901	<	zscan(yback[i])[i] < zscan(y)[xback])
902	<	copycolr(pscan(y)[i],pscan(y)[xback]);
903	<	else
904	<	copycolr(pscan(y)[i],pscan(yback[i])[i]);
899	>	if (samp > 0 && ABS(y-yback[x]) > samp)
900	>	goto fillit;
901	>	if (averaging) {
902	>	copycolor(sscan(y)[x],
903	>	sscan(yback[x])[x]);
904	>	wscan(y)[x] =
905	>	wscan(yback[x])[x];
906	>	} else
907	>	copycolr(pscan(y)[x],
908	>	pscan(yback[x])[x]);
909	>	zscan(y)[x] = zscan(yback[x])[x];
910		}
911	<	} else
912	<	yback[x] = -1;                  /* clear boundary */
913	<	free((char *)yback);
911	>	continue;
912	>	fillit:
913	>	(*fill)(x,y);
914	>	if (fill == rcalfill) {         /* use it */
915	>	clearqueue();
916	>	xback = x;
917	>	yback[x] = y;
918	>	}
919	>	} else {                                /* full pixel */
920	>	yback[x] = -2;
921	>	xback = -2;
922	>	}
923	>	}
924	>	free((void *)yback);
925		}
926
927
928	<	writepicture()                          /* write out picture */
928	>	fillpicture(fill)               /* paint in empty pixels using fill */
929	>	int     (*fill)();
930		{
931	+	register int    x, y;
932	+
933	+	for (y = 0; y < vresolu; y++)
934	+	for (x = 0; x < hresolu; x++)
935	+	if (zscan(y)[x] <= 0)
936	+	(*fill)(x,y);
937	+	if (fill == rcalfill)
938	+	clearqueue();
939	+	}
940	+
941	+
942	+	clipaft()                       /* perform aft clipping as indicated */
943	+	{
944	+	register int    x, y;
945	+	int     adjtest = (ourview.type == VT_PER) & zisnorm;
946	+	double  tstdist;
947	+	double  yzn2, vx;
948	+
949	+	if (ourview.vaft <= FTINY)
950	+	return(0);
951	+	tstdist = ourview.vaft - ourview.vfore;
952	+	for (y = 0; y < vresolu; y++) {
953	+	if (adjtest) {                          /* adjust test */
954	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
955	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
956	+	tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
957	+	}
958	+	for (x = 0; x < hresolu; x++)
959	+	if (zscan(y)[x] > tstdist) {
960	+	if (adjtest) {
961	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
962	+	if (zscan(y)[x] <= (ourview.vaft -
963	+	ourview.vfore) *
964	+	sqrt(vx*vx*ourview.hn2 + yzn2))
965	+	continue;
966	+	}
967	+	if (averaging)
968	+	memset(sscan(y)[x], '\0', sizeof(COLOR));
969	+	else
970	+	memset(pscan(y)[x], '\0', sizeof(COLR));
971	+	zscan(y)[x] = 0.0;
972	+	}
973	+	}
974	+	return(1);
975	+	}
976	+
977	+
978	+	addblur()                               /* add to blurred picture */
979	+	{
980	+	COLOR   cval;
981	+	double  d;
982	+	register int    i;
983	+
984	+	if (!blurring)
985	+	return(0);
986	+	i = hresolu*vresolu;
987	+	if (nvavg < 2)
988	+	if (averaging)
989	+	while (i--) {
990	+	copycolor(ourbpict[i], ourspict[i]);
991	+	d = 1.0/ourweigh[i];
992	+	scalecolor(ourbpict[i], d);
993	+	}
994	+	else
995	+	while (i--)
996	+	colr_color(ourbpict[i], ourpict[i]);
997	+	else
998	+	if (averaging)
999	+	while (i--) {
1000	+	copycolor(cval, ourspict[i]);
1001	+	d = 1.0/ourweigh[i];
1002	+	scalecolor(cval, d);
1003	+	addcolor(ourbpict[i], cval);
1004	+	}
1005	+	else
1006	+	while (i--) {
1007	+	colr_color(cval, ourpict[i]);
1008	+	addcolor(ourbpict[i], cval);
1009	+	}
1010	+	/* print view */
1011	+	printf("VIEW%d:", nvavg);
1012	+	fprintview(&ourview, stdout);
1013	+	putchar('\n');
1014	+	return(1);
1015	+	}
1016	+
1017	+
1018	+	writepicture()                          /* write out picture (alters buffer) */
1019	+	{
1020		int     y;
1021	+	register int    x;
1022	+	double  d;
1023
1024	<	fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout);
1025	<	for (y = ourview.vresolu-1; y >= 0; y--)
1026	<	if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) {
1027	<	perror(progname);
1028	<	exit(1);
1024	>	fprtresolu(hresolu, vresolu, stdout);
1025	>	for (y = vresolu-1; y >= 0; y--)
1026	>	if (blurring) {
1027	>	for (x = 0; x < hresolu; x++) { /* compute avg. */
1028	>	d = rexpadj/nvavg;
1029	>	scalecolor(bscan(y)[x], d);
1030	>	}
1031	>	if (fwritescan(bscan(y), hresolu, stdout) < 0)
1032	>	syserror(progname);
1033	>	} else if (averaging) {
1034	>	for (x = 0; x < hresolu; x++) { /* average pixels */
1035	>	d = rexpadj/wscan(y)[x];
1036	>	scalecolor(sscan(y)[x], d);
1037	>	}
1038	>	if (fwritescan(sscan(y), hresolu, stdout) < 0)
1039	>	syserror(progname);
1040	>	} else {
1041	>	if (expadj)
1042	>	shiftcolrs(pscan(y), hresolu, expadj);
1043	>	if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1044	>	syserror(progname);
1045		}
1046	+	}
1047	+
1048	+
1049	+	writedistance(fname)                    /* write out z file (alters buffer) */
1050	+	char    *fname;
1051	+	{
1052	+	int     donorm = normdist & !zisnorm ? 1 :
1053	+	(ourview.type == VT_PER) & !normdist & zisnorm ? -1 : 0;
1054	+	int     fd;
1055	+	int     y;
1056	+
1057	+	if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1058	+	syserror(fname);
1059	+	for (y = vresolu-1; y >= 0; y--) {
1060	+	if (donorm) {
1061	+	double  vx, yzn2, d;
1062	+	register int    x;
1063	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1064	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1065	+	for (x = 0; x < hresolu; x++) {
1066	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
1067	+	d = sqrt(vx*vx*ourview.hn2 + yzn2);
1068	+	if (donorm > 0)
1069	+	zscan(y)[x] *= d;
1070	+	else
1071	+	zscan(y)[x] /= d;
1072	+	}
1073	+	}
1074	+	if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1075	+	< hresolu*sizeof(float))
1076	+	syserror(fname);
1077	+	}
1078	+	close(fd);
1079	+	}
1080	+
1081	+
1082	+	backfill(x, y)                          /* fill pixel with background */
1083	+	int     x, y;
1084	+	{
1085	+	if (averaging) {
1086	+	copycolor(sscan(y)[x], backcolor);
1087	+	wscan(y)[x] = 1;
1088	+	} else
1089	+	copycolr(pscan(y)[x], backcolr);
1090	+	zscan(y)[x] = backz;
1091	+	}
1092	+
1093	+
1094	+	calstart(prog, args)                    /* start fill calculation */
1095	+	char    *prog, *args;
1096	+	{
1097	+	char    combuf[512];
1098	+	char    *argv[64];
1099	+	int     rval;
1100	+	register char   **wp, *cp;
1101	+
1102	+	if (PDesc.running) {
1103	+	fprintf(stderr, "%s: too many calculations\n", progname);
1104	+	exit(1);
1105	+	}
1106	+	strcpy(combuf, prog);
1107	+	strcat(combuf, args);
1108	+	cp = combuf;
1109	+	wp = argv;
1110	+	for ( ; ; ) {
1111	+	while (isspace(*cp))    /* nullify spaces */
1112	+	*cp++ = '\0';
1113	+	if (!*cp)               /* all done? */
1114	+	break;
1115	+	*wp++ = cp;             /* add argument to list */
1116	+	while (*++cp && !isspace(*cp))
1117	+	;
1118	+	}
1119	+	*wp = NULL;
1120	+	/* start process */
1121	+	if ((rval = open_process(&PDesc, argv)) < 0)
1122	+	syserror(progname);
1123	+	if (rval == 0) {
1124	+	fprintf(stderr, "%s: command not found\n", argv[0]);
1125	+	exit(1);
1126	+	}
1127	+	packsiz = rval/(6*sizeof(float)) - 1;
1128	+	if (packsiz > PACKSIZ)
1129	+	packsiz = PACKSIZ;
1130	+	queuesiz = 0;
1131	+	}
1132	+
1133	+
1134	+	caldone()                               /* done with calculation */
1135	+	{
1136	+	if (!PDesc.running)
1137	+	return;
1138	+	clearqueue();
1139	+	close_process(&PDesc);
1140	+	}
1141	+
1142	+
1143	+	rcalfill(x, y)                          /* fill with ray-calculated pixel */
1144	+	int     x, y;
1145	+	{
1146	+	if (queuesiz >= packsiz)        /* flush queue if needed */
1147	+	clearqueue();
1148	+	/* add position to queue */
1149	+	queue[queuesiz][0] = x;
1150	+	queue[queuesiz][1] = y;
1151	+	queuesiz++;
1152	+	}
1153	+
1154	+
1155	+	clearqueue()                            /* process queue */
1156	+	{
1157	+	FVECT   orig, dir;
1158	+	float   fbuf[6*(PACKSIZ+1)];
1159	+	register float  *fbp;
1160	+	register int    i;
1161	+	double  vx, vy;
1162	+
1163	+	if (queuesiz == 0)
1164	+	return;
1165	+	fbp = fbuf;
1166	+	for (i = 0; i < queuesiz; i++) {
1167	+	viewray(orig, dir, &ourview,
1168	+	(queue[i][0]+.5)/hresolu,
1169	+	(queue[i][1]+.5)/vresolu);
1170	+	*fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1171	+	*fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1172	+	}
1173	+	/* mark end and get results */
1174	+	memset((char *)fbp, '\0', 6*sizeof(float));
1175	+	if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1176	+	4*sizeof(float)*(queuesiz+1),
1177	+	6*sizeof(float)*(queuesiz+1)) !=
1178	+	4*sizeof(float)*(queuesiz+1)) {
1179	+	fprintf(stderr, "%s: error reading from rtrace process\n",
1180	+	progname);
1181	+	exit(1);
1182	+	}
1183	+	fbp = fbuf;
1184	+	for (i = 0; i < queuesiz; i++) {
1185	+	if (ourexp > 0 && ourexp != 1.0) {
1186	+	fbp[0] *= ourexp;
1187	+	fbp[1] *= ourexp;
1188	+	fbp[2] *= ourexp;
1189	+	}
1190	+	if (averaging) {
1191	+	setcolor(sscan(queue[i][1])[queue[i][0]],
1192	+	fbp[0], fbp[1], fbp[2]);
1193	+	wscan(queue[i][1])[queue[i][0]] = 1;
1194	+	} else
1195	+	setcolr(pscan(queue[i][1])[queue[i][0]],
1196	+	fbp[0], fbp[1], fbp[2]);
1197	+	if (zisnorm)
1198	+	zscan(queue[i][1])[queue[i][0]] = fbp[3];
1199	+	else {
1200	+	vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1201	+	vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1202	+	zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1203	+	vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1204	+	}
1205	+	fbp += 4;
1206	+	}
1207	+	queuesiz = 0;
1208	+	}
1209	+
1210	+
1211	+	syserror(s)                     /* report error and exit */
1212	+	char    *s;
1213	+	{
1214	+	perror(s);
1215	+	exit(1);
1216		}

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