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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 2.41 by schorsch, Sun Mar 28 20:33:14 2004 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 "platform.h"
16	+	#include "standard.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	+	#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	+	#define MAXWT           1000.           /* maximum pixel weight (averaging) */
34	+
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	<	VIEW    ourview = STDVIEW(512);         /* desired view */
44	>	struct position {int x,y; float z;};
45
46	<	double  zeps = 0.001;                   /* allowed z epsilon */
46	>	#define NSTEPS          64              /* number steps in overlap prescan */
47	>	#define MINSTEP         4               /* minimum worthwhile preview step */
48
49	<	COLR    *ourpict;                       /* output picture */
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	>	COLR    backcolr = BLKCOLR;             /* background color */
72	>	COLOR   backcolor = BLKCOLOR;           /* background color (float) */
73	>	double  backz = 0.0;                    /* background z value */
74	>	int     normdist = 1;                   /* i/o normalized distance? */
75	>	char    ourfmt[LPICFMT+1] = PICFMT;     /* original picture format */
76	>	double  ourexp = -1;                    /* original picture exposure */
77	>	int     expadj = 0;                     /* exposure adjustment (f-stops) */
78	>	double  rexpadj = 1;                    /* real exposure adjustment */
79	>
80	>	VIEW    theirview;                      /* input view */
81		int     gotview;                        /* got input view? */
82	+	int     wrongformat = 0;                /* input in another format? */
83	+	RESOLU  tresolu;                        /* input resolution */
84	+	double  theirexp;                       /* input picture exposure */
85	+	MAT4    theirs2ours;                    /* transformation matrix */
86	+	int     hasmatrix = 0;                  /* has transformation matrix */
87
88	<	double  theirs2ours[4][4];              /* transformation matrix */
88	>	static SUBPROC PDesc = SP_INACTIVE; /* rtrace process descriptor */
89	>	unsigned short  queue[PACKSIZ][2];      /* pending pixels */
90	>	int     packsiz;                        /* actual packet size */
91	>	int     queuesiz = 0;                   /* number of pixels pending */
92
93	+	typedef void fillfunc_t(int x, int y);
94
95	<	main(argc, argv)                        /* interpolate pictures */
96	<	int     argc;
97	<	char    *argv[];
95	>	static gethfunc headline;
96	>	static int nextview(FILE *fp);
97	>	static void compavgview(void);
98	>	static void addpicture(char *pfile, char *zspec);
99	>	static int pixform(MAT4 xfmat, VIEW *vw1, VIEW *vw2);
100	>	static void addscanline(struct bound *xl, int y,
101	>	COLR *pline, float *zline, struct position *lasty);
102	>	static void addpixel(struct position *p0, struct position *p1,
103	>	struct position *p2, COLR pix, double w, double z);
104	>	static double movepixel(FVECT pos);
105	>	static int getperim(struct bound *xl, struct bound *yl, float *zline, int zfd);
106	>	static void backpicture(fillfunc_t *fill, int samp);
107	>	static void fillpicture(fillfunc_t *fill);
108	>	static int clipaft(void);
109	>	static int addblur(void);
110	>	static void writepicture(void);
111	>	static void writedistance(char *fname);
112	>	static fillfunc_t backfill;
113	>	static fillfunc_t rcalfill;
114	>	static void calstart(char *prog, char *args);
115	>	static void caldone(void);
116	>	static void clearqueue(void);
117	>	static void syserror(char *s);
118	>
119	>	fillfunc_t *fillfunc = backfill;        /* selected fill function */
120	>
121	>	int
122	>	main(                   /* interpolate pictures */
123	>	int     argc,
124	>	char    *argv[]
125	>	)
126		{
127	<	#define check(olen,narg)        if (argv[i][olen] || narg >= argc-i) goto badopt
127	>	#define  check(ol,al)           if (argv[an][ol] || \
128	>	badarg(argc-an-1,argv+an+1,al)) \
129	>	goto badopt
130		int     gotvfile = 0;
131	<	char    *err;
132	<	int     i;
131	>	int     doavg = -1;
132	>	int     doblur = 0;
133	>	char    *zfile = NULL;
134	>	char    *expcomp = NULL;
135	>	int     i, an, rval;
136
137		progname = argv[0];
138
139	<	for (i = 1; i < argc && argv[i][0] == '-'; i++)
140	<	switch (argv[i][1]) {
139	>	for (an = 1; an < argc && argv[an][0] == '-'; an++) {
140	>	rval = getviewopt(&ourview, argc-an, argv+an);
141	>	if (rval >= 0) {
142	>	an += rval;
143	>	continue;
144	>	}
145	>	switch (argv[an][1]) {
146	>	case 'e':                               /* exposure */
147	>	check(2,"f");
148	>	expcomp = argv[++an];
149	>	break;
150		case 't':                               /* threshold */
151	<	check(2,1);
152	<	zeps = atof(argv[++i]);
151	>	check(2,"f");
152	>	zeps = atof(argv[++an]);
153		break;
154	<	case 'x':                               /* x resolution */
155	<	check(2,1);
156	<	ourview.hresolu = atoi(argv[++i]);
154	>	case 'a':                               /* average */
155	>	check(2,NULL);
156	>	doavg = 1;
157		break;
158	<	case 'y':                               /* y resolution */
159	<	check(2,1);
160	<	ourview.vresolu = atoi(argv[++i]);
158	>	case 'B':                               /* blur views */
159	>	check(2,NULL);
160	>	doblur = 1;
161		break;
162	<	case 'v':                               /* view */
163	<	switch (argv[i][2]) {
164	<	case 't':                               /* type */
165	<	check(4,0);
166	<	ourview.type = argv[i][3];
162	>	case 'q':                               /* quick (no avg.) */
163	>	check(2,NULL);
164	>	doavg = 0;
165	>	break;
166	>	case 'n':                               /* dist. normalized? */
167	>	check(2,NULL);
168	>	normdist = !normdist;
169	>	break;
170	>	case 'f':                               /* fill type */
171	>	switch (argv[an][2]) {
172	>	case '0':                               /* none */
173	>	check(3,NULL);
174	>	fillo = 0;
175		break;
176	<	case 'p':                               /* point */
177	<	check(3,3);
178	<	ourview.vp[0] = atof(argv[++i]);
71	<	ourview.vp[1] = atof(argv[++i]);
72	<	ourview.vp[2] = atof(argv[++i]);
176	>	case 'f':                               /* foreground */
177	>	check(3,NULL);
178	>	fillo = F_FORE;
179		break;
180	<	case 'd':                               /* direction */
181	<	check(3,3);
182	<	ourview.vdir[0] = atof(argv[++i]);
77	<	ourview.vdir[1] = atof(argv[++i]);
78	<	ourview.vdir[2] = atof(argv[++i]);
180	>	case 'b':                               /* background */
181	>	check(3,NULL);
182	>	fillo = F_BACK;
183		break;
184	<	case 'u':                               /* up */
185	<	check(3,3);
186	<	ourview.vup[0] = atof(argv[++i]);
83	<	ourview.vup[1] = atof(argv[++i]);
84	<	ourview.vup[2] = atof(argv[++i]);
184	>	case 'a':                               /* all */
185	>	check(3,NULL);
186	>	fillo = F_FORE|F_BACK;
187		break;
188	<	case 'h':                               /* horizontal */
189	<	check(3,1);
190	<	ourview.horiz = atof(argv[++i]);
188	>	case 's':                               /* sample */
189	>	check(3,"i");
190	>	fillsamp = atoi(argv[++an]);
191		break;
192	<	case 'v':                               /* vertical */
193	<	check(3,1);
194	<	ourview.vert = atof(argv[++i]);
192	>	case 'c':                               /* color */
193	>	check(3,"fff");
194	>	fillfunc = backfill;
195	>	setcolor(backcolor, atof(argv[an+1]),
196	>	atof(argv[an+2]), atof(argv[an+3]));
197	>	setcolr(backcolr, colval(backcolor,RED),
198	>	colval(backcolor,GRN),
199	>	colval(backcolor,BLU));
200	>	an += 3;
201		break;
202	<	case 'f':                               /* file */
203	<	check(3,1);
204	<	gotvfile = viewfile(argv[++i], &ourview);
205	<	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	<	}
202	>	case 'z':                               /* z value */
203	>	check(3,"f");
204	>	fillfunc = backfill;
205	>	backz = atof(argv[++an]);
206		break;
207	+	case 'r':                               /* rtrace */
208	+	check(3,"s");
209	+	fillfunc = rcalfill;
210	+	calstart(RTCOM, argv[++an]);
211	+	break;
212		default:
213		goto badopt;
214		}
215		break;
216	+	case 'z':                               /* z file */
217	+	check(2,"s");
218	+	zfile = argv[++an];
219	+	break;
220	+	case 'x':                               /* x resolution */
221	+	check(2,"i");
222	+	hresolu = atoi(argv[++an]);
223	+	break;
224	+	case 'y':                               /* y resolution */
225	+	check(2,"i");
226	+	vresolu = atoi(argv[++an]);
227	+	break;
228	+	case 'p':                               /* pixel aspect */
229	+	if (argv[an][2] != 'a')
230	+	goto badopt;
231	+	check(3,"f");
232	+	pixaspect = atof(argv[++an]);
233	+	break;
234	+	case 'v':                               /* view file */
235	+	if (argv[an][2] != 'f')
236	+	goto badopt;
237	+	check(3,"s");
238	+	gotvfile = viewfile(argv[++an], &ourview, NULL);
239	+	if (gotvfile < 0)
240	+	syserror(argv[an]);
241	+	else if (gotvfile == 0) {
242	+	fprintf(stderr, "%s: bad view file\n",
243	+	argv[an]);
244	+	exit(1);
245	+	}
246	+	break;
247		default:
248		badopt:
249	<	fprintf(stderr, "%s: unknown option '%s'\n",
250	<	progname, argv[i]);
251	<	exit(1);
249	>	fprintf(stderr, "%s: command line error at '%s'\n",
250	>	progname, argv[an]);
251	>	goto userr;
252		}
253	+	}
254		/* check arguments */
255	<	if (argc-i < 2 || (argc-i)%2) {
256	<	fprintf(stderr, "Usage: %s [view args] pfile zfile ..\n",
257	<	progname);
258	<	exit(1);
255	>	if ((argc-an)%2)
256	>	goto userr;
257	>	if (fillsamp == 1)
258	>	fillo &= ~F_BACK;
259	>	if (doavg < 0)
260	>	doavg = (argc-an) > 2;
261	>	if (expcomp != NULL) {
262	>	if ((expcomp[0] == '+') | (expcomp[0] == '-')) {
263	>	expadj = atof(expcomp) + (expcomp[0]=='+' ? .5 : -.5);
264	>	if (doavg | doblur)
265	>	rexpadj = pow(2.0, atof(expcomp));
266	>	else
267	>	rexpadj = pow(2.0, (double)expadj);
268	>	} else {
269	>	if (!isflt(expcomp))
270	>	goto userr;
271	>	rexpadj = atof(expcomp);
272	>	expadj = log(rexpadj)/LOG2 + (rexpadj>1 ? .5 : -.5);
273	>	if (!(doavg | doblur))
274	>	rexpadj = pow(2.0, (double)expadj);
275	>	}
276		}
277		/* set view */
278	<	if (err = setview(&ourview)) {
279	<	fprintf(stderr, "%s: %s\n", progname, err);
278	>	if (nextview(doblur ? stdin : (FILE *)NULL) == EOF) {
279	>	fprintf(stderr, "%s: no view on standard input!\n",
280	>	progname);
281		exit(1);
282		}
283	+	normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu);
284		/* allocate frame */
285	<	ourpict = (COLR *)calloc(ourview.hresolu*ourview.vresolu,sizeof(COLR));
286	<	ourzbuf = (float *)calloc(ourview.hresolu*ourview.vresolu,sizeof(float));
287	<	if (ourpict == NULL || ourzbuf == NULL) {
288	<	perror(progname);
289	<	exit(1);
285	>	if (doavg) {
286	>	ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
287	>	ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float));
288	>	if ((ourspict == NULL) | (ourweigh == NULL))
289	>	syserror(progname);
290	>	} else {
291	>	ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR));
292	>	if (ourpict == NULL)
293	>	syserror(progname);
294		}
295	<	/* get input */
296	<	for ( ; i < argc; i += 2)
297	<	addpicture(argv[i], argv[i+1]);
298	<	/* fill in spaces */
299	<	fillpicture();
295	>	if (doblur) {
296	>	ourbpict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR));
297	>	if (ourbpict == NULL)
298	>	syserror(progname);
299	>	}
300	>	ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float));
301	>	if (ourzbuf == NULL)
302	>	syserror(progname);
303	>	/* new header */
304	>	newheader("RADIANCE", stdout);
305	>	fputnow(stdout);
306	>	/* run pictures */
307	>	do {
308	>	memset((char *)ourzbuf, '\0', hresolu*vresolu*sizeof(float));
309	>	for (i = an; i < argc; i += 2)
310	>	addpicture(argv[i], argv[i+1]);
311	>	if (fillo&F_BACK)                       /* fill in spaces */
312	>	backpicture(fillfunc, fillsamp);
313	>	else
314	>	fillpicture(fillfunc);
315	>	/* aft clipping */
316	>	clipaft();
317	>	} while (addblur() && nextview(stdin) != EOF);
318	>	/* close calculation */
319	>	caldone();
320		/* add to header */
321		printargs(argc, argv, stdout);
322	<	if (gotvfile) {
323	<	printf(VIEWSTR);
324	<	fprintview(&ourview, stdout);
325	<	printf("\n");
322	>	compavgview();
323	>	if (doblur | gotvfile) {
324	>	fputs(VIEWSTR, stdout);
325	>	fprintview(&avgview, stdout);
326	>	putc('\n', stdout);
327		}
328	<	printf("\n");
329	<	/* write output */
328	>	if ((pixaspect < .99) | (pixaspect > 1.01))
329	>	fputaspect(pixaspect, stdout);
330	>	if (ourexp > 0)
331	>	ourexp *= rexpadj;
332	>	else
333	>	ourexp = rexpadj;
334	>	if ((ourexp < .995) | (ourexp > 1.005))
335	>	fputexpos(ourexp, stdout);
336	>	if (strcmp(ourfmt, PICFMT))             /* print format if known */
337	>	fputformat(ourfmt, stdout);
338	>	putc('\n', stdout);
339	>	/* write picture */
340		writepicture();
341	+	/* write z file */
342	+	if (zfile != NULL)
343	+	writedistance(zfile);
344
345		exit(0);
346	+	userr:
347	+	fprintf(stderr,
348	+	"Usage: %s [view opts][-t eps][-z zout][-e spec][-B][-a|-q][-fT][-n] pfile zspec ..\n",
349	+	progname);
350	+	exit(1);
351		#undef check
352		}
353
354
355	<	headline(s)                             /* process header string */
356	<	char    *s;
355	>	static int
356	>	headline(                               /* process header string */
357	>	char    *s,
358	>	void    *p
359	>	)
360		{
361	<	static char     *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL};
159	<	register char   **an;
361	>	char    fmt[32];
362
363	<	printf("\t%s", s);
364	<
365	<	for (an = altname; *an != NULL; an++)
366	<	if (!strncmp(*an, s, strlen(*an))) {
367	<	if (sscanview(&theirview, s+strlen(*an)) == 0)
368	<	gotview++;
369	<	break;
370	<	}
363	>	if (isheadid(s))
364	>	return(0);
365	>	if (formatval(fmt, s)) {
366	>	if (globmatch(ourfmt, fmt)) {
367	>	wrongformat = 0;
368	>	strcpy(ourfmt, fmt);
369	>	} else
370	>	wrongformat = 1;
371	>	return(0);
372	>	}
373	>	if (nvavg < 2) {
374	>	putc('\t', stdout);
375	>	fputs(s, stdout);
376	>	}
377	>	if (isexpos(s)) {
378	>	theirexp *= exposval(s);
379	>	return(0);
380	>	}
381	>	if (isview(s) && sscanview(&theirview, s) > 0)
382	>	gotview++;
383	>	return(0);
384		}
385
386
387	<	addpicture(pfile, zfile)                /* add picture to output */
388	<	char    *pfile, *zfile;
387	>	static int
388	>	nextview(                               /* get and set next view */
389	>	FILE    *fp
390	>	)
391		{
392	<	FILE    *pfp, *zfp;
176	<	COLR    *scanin;
177	<	float   *zin;
392	>	char    linebuf[256];
393		char    *err;
394	<	int     xres, yres;
395	<	int     y;
396	<	/* open input files */
397	<	if ((pfp = fopen(pfile, "r")) == NULL) {
398	<	perror(pfile);
399	<	exit(1);
394	>	register int    i;
395	>
396	>	if (fp != NULL) {
397	>	do                      /* get new view */
398	>	if (fgets(linebuf, sizeof(linebuf), fp) == NULL)
399	>	return(EOF);
400	>	while (!isview(linebuf) || !sscanview(&ourview, linebuf));
401		}
402	<	if ((zfp = fopen(zfile, "r")) == NULL) {
403	<	perror(zfile);
402	>	/* set new view */
403	>	if ((err = setview(&ourview)) != NULL) {
404	>	fprintf(stderr, "%s: %s\n", progname, err);
405		exit(1);
406		}
407	<	/* get header and view */
408	<	printf("%s:\n", pfile);
407	>	if (!nvavg) {                   /* first view */
408	>	avgview = ourview;
409	>	return(nvavg++);
410	>	}
411	>	/* add to average view */
412	>	for (i = 0; i < 3; i++) {
413	>	avgview.vp[i] += ourview.vp[i];
414	>	avgview.vdir[i] += ourview.vdir[i];
415	>	avgview.vup[i] += ourview.vup[i];
416	>	}
417	>	avgview.horiz += ourview.horiz;
418	>	avgview.vert += ourview.vert;
419	>	avgview.hoff += ourview.hoff;
420	>	avgview.voff += ourview.voff;
421	>	avgview.vfore += ourview.vfore;
422	>	avgview.vaft += ourview.vaft;
423	>	return(nvavg++);
424	>	}
425	>
426	>
427	>	static void
428	>	compavgview(void)                               /* compute average view */
429	>	{
430	>	register int    i;
431	>	double  f;
432	>
433	>	if (nvavg < 2)
434	>	return;
435	>	f = 1.0/nvavg;
436	>	for (i = 0; i < 3; i++) {
437	>	avgview.vp[i] *= f;
438	>	avgview.vdir[i] *= f;
439	>	avgview.vup[i] *= f;
440	>	}
441	>	avgview.horiz *= f;
442	>	avgview.vert *= f;
443	>	avgview.hoff *= f;
444	>	avgview.voff *= f;
445	>	avgview.vfore *= f;
446	>	avgview.vaft *= f;
447	>	if (setview(&avgview) != NULL)          /* in case of emergency... */
448	>	avgview = ourview;
449	>	pixaspect = viewaspect(&avgview) * hresolu / vresolu;
450	>	}
451	>
452	>
453	>	static void
454	>	addpicture(             /* add picture to output */
455	>	char    *pfile,
456	>	char    *zspec
457	>	)
458	>	{
459	>	FILE    *pfp;
460	>	int     zfd;
461	>	char    *err;
462	>	COLR    *scanin;
463	>	float   *zin;
464	>	struct position *plast;
465	>	struct bound    *xlim, ylim;
466	>	int     y;
467	>	/* open picture file */
468	>	if ((pfp = fopen(pfile, "r")) == NULL)
469	>	syserror(pfile);
470	>	/* get header with exposure and view */
471	>	theirexp = 1.0;
472	>	theirview = stdview;
473		gotview = 0;
474	<	getheader(pfp, headline);
475	<	if (!gotview || fgetresolu(&xres, &yres, pfp) != (YMAJOR|YDECR)) {
476	<	fprintf(stderr, "%s: picture view error\n", pfile);
474	>	if (nvavg < 2)
475	>	printf("%s:\n", pfile);
476	>	getheader(pfp, headline, NULL);
477	>	if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) {
478	>	fprintf(stderr, "%s: picture format error\n", pfile);
479		exit(1);
480		}
481	<	theirview.hresolu = xres;
482	<	theirview.vresolu = yres;
483	<	if (err = setview(&theirview)) {
481	>	if (ourexp <= 0)
482	>	ourexp = theirexp;
483	>	else if (ABS(theirexp-ourexp) > .01*ourexp)
484	>	fprintf(stderr, "%s: different exposure (warning)\n", pfile);
485	>	if ( (err = setview(&theirview)) ) {
486		fprintf(stderr, "%s: %s\n", pfile, err);
487		exit(1);
488		}
489		/* compute transformation */
490	<	pixform(theirs2ours, &theirview, &ourview);
491	<	/* allocate scanlines */
492	<	scanin = (COLR *)malloc(xres*sizeof(COLR));
493	<	zin = (float *)malloc(xres*sizeof(float));
494	<	if (scanin == NULL || zin == NULL) {
495	<	perror(progname);
496	<	exit(1);
490	>	hasmatrix = pixform(theirs2ours, &theirview, &ourview);
491	>	/* get z specification or file */
492	>	zin = (float *)malloc(scanlen(&tresolu)*sizeof(float));
493	>	if (zin == NULL)
494	>	syserror(progname);
495	>	if ((zfd = open(zspec, O_RDONLY)) == -1) {
496	>	double  zvalue;
497	>	register int    x;
498	>	if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0)
499	>	syserror(zspec);
500	>	for (x = scanlen(&tresolu); x-- > 0; )
501	>	zin[x] = zvalue;
502		}
503	<	/* load image */
504	<	for (y = yres-1; y >= 0; y--) {
505	<	if (freadcolrs(scanin, xres, pfp) < 0) {
503	>	/* compute transferrable perimeter */
504	>	xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound));
505	>	if (xlim == NULL)
506	>	syserror(progname);
507	>	if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */
508	>	free((void *)zin);
509	>	free((void *)xlim);
510	>	if (zfd != -1)
511	>	close(zfd);
512	>	fclose(pfp);
513	>	return;
514	>	}
515	>	/* allocate scanlines */
516	>	scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR));
517	>	plast = (struct position *)calloc(scanlen(&tresolu),
518	>	sizeof(struct position));
519	>	if ((scanin == NULL) | (plast == NULL))
520	>	syserror(progname);
521	>	/* skip to starting point */
522	>	for (y = 0; y < ylim.min; y++)
523	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
524		fprintf(stderr, "%s: read error\n", pfile);
525		exit(1);
526		}
527	<	if (fread(zin, sizeof(float), xres, zfp) < xres) {
528	<	fprintf(stderr, "%s: read error\n", zfile);
527	>	if (zfd != -1 && lseek(zfd,
528	>	(off_t)ylim.min*scanlen(&tresolu)*sizeof(float),
529	>	SEEK_SET) < 0)
530	>	syserror(zspec);
531	>	/* load image */
532	>	for (y = ylim.min; y <= ylim.max; y++) {
533	>	if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) {
534	>	fprintf(stderr, "%s: read error\n", pfile);
535		exit(1);
536		}
537	<	addscanline(y, scanin, zin);
537	>	if (zfd != -1 && read(zfd, (char *)zin,
538	>	scanlen(&tresolu)*sizeof(float))
539	>	< scanlen(&tresolu)*sizeof(float))
540	>	syserror(zspec);
541	>	addscanline(xlim+y, y, scanin, zin, plast);
542		}
543		/* clean up */
544	<	free((char *)scanin);
545	<	free((char *)zin);
544	>	free((void *)xlim);
545	>	free((void *)scanin);
546	>	free((void *)zin);
547	>	free((void *)plast);
548		fclose(pfp);
549	<	fclose(zfp);
549	>	if (zfd != -1)
550	>	close(zfd);
551		}
552
553
554	<	pixform(xfmat, vw1, vw2)                /* compute view1 to view2 matrix */
555	<	register double xfmat[4][4];
556	<	register VIEW   *vw1, *vw2;
554	>	static int
555	>	pixform(                /* compute view1 to view2 matrix */
556	>	register MAT4   xfmat,
557	>	register VIEW   *vw1,
558	>	register VIEW   *vw2
559	>	)
560		{
561		double  m4t[4][4];
562
563	+	if ((vw1->type != VT_PER) & (vw1->type != VT_PAR))
564	+	return(0);
565	+	if ((vw2->type != VT_PER) & (vw2->type != VT_PAR))
566	+	return(0);
567		setident4(xfmat);
568	<	xfmat[0][0] = vw1->vhinc[0];
569	<	xfmat[0][1] = vw1->vhinc[1];
570	<	xfmat[0][2] = vw1->vhinc[2];
571	<	xfmat[1][0] = vw1->vvinc[0];
572	<	xfmat[1][1] = vw1->vvinc[1];
573	<	xfmat[1][2] = vw1->vvinc[2];
568	>	xfmat[0][0] = vw1->hvec[0];
569	>	xfmat[0][1] = vw1->hvec[1];
570	>	xfmat[0][2] = vw1->hvec[2];
571	>	xfmat[1][0] = vw1->vvec[0];
572	>	xfmat[1][1] = vw1->vvec[1];
573	>	xfmat[1][2] = vw1->vvec[2];
574		xfmat[2][0] = vw1->vdir[0];
575		xfmat[2][1] = vw1->vdir[1];
576		xfmat[2][2] = vw1->vdir[2];
#	Line 250 | Line 578 | register VIEW  *vw1, *vw2;
578		xfmat[3][1] = vw1->vp[1];
579		xfmat[3][2] = vw1->vp[2];
580		setident4(m4t);
581	<	m4t[0][0] = vw2->vhinc[0]/vw2->vhn2;
582	<	m4t[1][0] = vw2->vhinc[1]/vw2->vhn2;
583	<	m4t[2][0] = vw2->vhinc[2]/vw2->vhn2;
584	<	m4t[3][0] = -DOT(vw2->vp,vw2->vhinc)/vw2->vhn2;
585	<	m4t[0][1] = vw2->vvinc[0]/vw2->vvn2;
586	<	m4t[1][1] = vw2->vvinc[1]/vw2->vvn2;
587	<	m4t[2][1] = vw2->vvinc[2]/vw2->vvn2;
588	<	m4t[3][1] = -DOT(vw2->vp,vw2->vvinc)/vw2->vvn2;
581	>	m4t[0][0] = vw2->hvec[0]/vw2->hn2;
582	>	m4t[1][0] = vw2->hvec[1]/vw2->hn2;
583	>	m4t[2][0] = vw2->hvec[2]/vw2->hn2;
584	>	m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2;
585	>	m4t[0][1] = vw2->vvec[0]/vw2->vn2;
586	>	m4t[1][1] = vw2->vvec[1]/vw2->vn2;
587	>	m4t[2][1] = vw2->vvec[2]/vw2->vn2;
588	>	m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2;
589		m4t[0][2] = vw2->vdir[0];
590		m4t[1][2] = vw2->vdir[1];
591		m4t[2][2] = vw2->vdir[2];
592		m4t[3][2] = -DOT(vw2->vp,vw2->vdir);
593		multmat4(xfmat, xfmat, m4t);
594	+	return(1);
595		}
596
597
598	<	addscanline(y, pline, zline)            /* add scanline to output */
599	<	int     y;
600	<	COLR    *pline;
601	<	float   *zline;
598	>	static void
599	>	addscanline(    /* add scanline to output */
600	>	struct bound    *xl,
601	>	int     y,
602	>	COLR    *pline,
603	>	float   *zline,
604	>	struct position *lasty          /* input/output */
605	>	)
606		{
607	<	extern double   sqrt();
608	<	double  pos[3];
607	>	FVECT   pos;
608	>	struct position lastx, newpos;
609	>	double  wt;
610		register int    x;
277	–	register int    xpos, ypos;
611
612	<	for (x = 0; x < theirview.hresolu; x++) {
613	<	pos[0] = x - .5*(theirview.hresolu-1);
614	<	pos[1] = y - .5*(theirview.vresolu-1);
612	>	lastx.z = 0;
613	>	for (x = xl->max; x >= xl->min; x--) {
614	>	pix2loc(pos, &tresolu, x, y);
615		pos[2] = zline[x];
616	+	if ((wt = movepixel(pos)) <= FTINY) {
617	+	lasty[x].z = lastx.z = 0;       /* mark invalid */
618	+	continue;
619	+	}
620	+	/* add pixel to our image */
621	+	newpos.x = pos[0] * hresolu;
622	+	newpos.y = pos[1] * vresolu;
623	+	newpos.z = zline[x];
624	+	addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]);
625	+	lasty[x].x = lastx.x = newpos.x;
626	+	lasty[x].y = lastx.y = newpos.y;
627	+	lasty[x].z = lastx.z = newpos.z;
628	+	}
629	+	}
630	+
631	+
632	+	static void
633	+	addpixel(               /* fill in pixel parallelogram */
634	+	struct position *p0,
635	+	struct position *p1,
636	+	struct position *p2,
637	+	COLR    pix,
638	+	double  w,
639	+	double  z
640	+	)
641	+	{
642	+	double  zt = 2.*zeps*p0->z;             /* threshold */
643	+	COLOR   pval;                           /* converted+weighted pixel */
644	+	int     s1x, s1y, s2x, s2y;             /* step sizes */
645	+	int     l1, l2, c1, c2;                 /* side lengths and counters */
646	+	int     p1isy;                          /* p0p1 along y? */
647	+	int     x1, y1;                         /* p1 position */
648	+	register int    x, y;                   /* final position */
649	+
650	+	/* compute vector p0p1 */
651	+	if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) {
652	+	s1x = p1->x - p0->x;
653	+	s1y = p1->y - p0->y;
654	+	l1 = ABS(s1x);
655	+	if ( (p1isy = (ABS(s1y) > l1)) )
656	+	l1 = ABS(s1y);
657	+	else if (l1 < 1)
658	+	l1 = 1;
659	+	} else {
660	+	l1 = s1x = s1y = 1;
661	+	p1isy = -1;
662	+	}
663	+	/* compute vector p0p2 */
664	+	if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) {
665	+	s2x = p2->x - p0->x;
666	+	s2y = p2->y - p0->y;
667	+	if (p1isy == 1)
668	+	l2 = ABS(s2x);
669	+	else {
670	+	l2 = ABS(s2y);
671	+	if (p1isy != 0 && ABS(s2x) > l2)
672	+	l2 = ABS(s2x);
673	+	}
674	+	if (l2 < 1)
675	+	l2 = 1;
676	+	} else
677	+	l2 = s2x = s2y = 1;
678	+	/* fill the parallelogram */
679	+	if (averaging) {
680	+	colr_color(pval, pix);
681	+	scalecolor(pval, w);
682	+	}
683	+	for (c1 = l1; c1-- > 0; ) {
684	+	x1 = p0->x + c1*s1x/l1;
685	+	y1 = p0->y + c1*s1y/l1;
686	+	for (c2 = l2; c2-- > 0; ) {
687	+	x = x1 + c2*s2x/l2;
688	+	if ((x < 0) | (x >= hresolu))
689	+	continue;
690	+	y = y1 + c2*s2y/l2;
691	+	if ((y < 0) | (y >= vresolu))
692	+	continue;
693	+	if (averaging) {
694	+	if (zscan(y)[x] <= 0 || zscan(y)[x]-z
695	+	> zeps*zscan(y)[x]) {
696	+	copycolor(sscan(y)[x], pval);
697	+	wscan(y)[x] = w;
698	+	zscan(y)[x] = z;
699	+	} else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) {
700	+	addcolor(sscan(y)[x], pval);
701	+	wscan(y)[x] += w;
702	+	}
703	+	} else if (zscan(y)[x] <= 0 || zscan(y)[x]-z
704	+	> zeps*zscan(y)[x]) {
705	+	copycolr(pscan(y)[x], pix);
706	+	zscan(y)[x] = z;
707	+	}
708	+	}
709	+	}
710	+	}
711	+
712	+
713	+	static double
714	+	movepixel(                              /* reposition image point */
715	+	register FVECT  pos
716	+	)
717	+	{
718	+	FVECT   pt, tdir, odir;
719	+	double  d;
720	+
721	+	if (pos[2] <= 0)                /* empty pixel */
722	+	return(0);
723	+	if (usematrix) {
724	+	pos[0] += theirview.hoff - .5;
725	+	pos[1] += theirview.voff - .5;
726	+	if (normdist & (theirview.type == VT_PER))
727	+	d = sqrt(1. + pos[0]*pos[0]*theirview.hn2
728	+	+ pos[1]*pos[1]*theirview.vn2);
729	+	else
730	+	d = 1.;
731	+	pos[2] += d*theirview.vfore;
732		if (theirview.type == VT_PER) {
733	<	pos[2] /= sqrt( 1.
285	<	+ pos[0]*pos[0]*theirview.vhn2
286	<	+ pos[1]*pos[1]*theirview.vvn2 );
733	>	pos[2] /= d;
734		pos[0] *= pos[2];
735		pos[1] *= pos[2];
736		}
737		multp3(pos, pos, theirs2ours);
738	<	if (pos[2] <= 0.0)
739	<	continue;
738	>	if (pos[2] <= ourview.vfore)
739	>	return(0);
740		if (ourview.type == VT_PER) {
741		pos[0] /= pos[2];
742		pos[1] /= pos[2];
743		}
744	<	pos[0] += .5*ourview.hresolu;
745	<	pos[1] += .5*ourview.vresolu;
746	<	if (pos[0] < 0 || pos[0] > ourview.hresolu
747	<	|| pos[1] < 0 || pos[1] > ourview.vresolu)
748	<	continue;
749	<	/* check current value at pos */
750	<	xpos = pos[0];
751	<	ypos = pos[1];
752	<	if (zscan(ypos)[xpos] <= 0.0
753	<	|| zscan(ypos)[xpos] - pos[2]
754	<	> zeps*zscan(ypos)[xpos]) {
755	<	zscan(ypos)[xpos] = pos[2];
756	<	copycolr(pscan(ypos)[xpos], pline[x]);
744	>	pos[0] += .5 - ourview.hoff;
745	>	pos[1] += .5 - ourview.voff;
746	>	pos[2] -= ourview.vfore;
747	>	} else {
748	>	if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY)
749	>	return(0);
750	>	if ((!normdist) & (theirview.type == VT_PER))   /* adjust */
751	>	pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2
752	>	+ pos[1]*pos[1]*theirview.vn2);
753	>	pt[0] += tdir[0]*pos[2];
754	>	pt[1] += tdir[1]*pos[2];
755	>	pt[2] += tdir[2]*pos[2];
756	>	viewloc(pos, &ourview, pt);
757	>	if (pos[2] <= 0)
758	>	return(0);
759	>	}
760	>	if ((pos[0] < 0) | (pos[0] >= 1-FTINY) | (pos[1] < 0) | (pos[1] >= 1-FTINY))
761	>	return(0);
762	>	if (!averaging)
763	>	return(1);
764	>	/* compute pixel weight */
765	>	if (ourview.type == VT_PAR) {
766	>	d = DOT(ourview.vdir,tdir);
767	>	d = 1. - d*d;
768	>	} else {
769	>	VSUB(odir, pt, ourview.vp);
770	>	d = DOT(odir,tdir);
771	>	d = 1. - d*d/DOT(odir,odir);
772	>	}
773	>	if (d <= 1./MAXWT/MAXWT)
774	>	return(MAXWT);          /* clip to maximum weight */
775	>	return(1./sqrt(d));
776	>	}
777	>
778	>
779	>	static int
780	>	getperim(               /* compute overlapping image area */
781	>	register struct bound   *xl,
782	>	struct bound    *yl,
783	>	float   *zline,
784	>	int     zfd
785	>	)
786	>	{
787	>	int     step;
788	>	FVECT   pos;
789	>	register int    x, y;
790	>	/* set up step size */
791	>	if (scanlen(&tresolu) < numscans(&tresolu))
792	>	step = scanlen(&tresolu)/NSTEPS;
793	>	else
794	>	step = numscans(&tresolu)/NSTEPS;
795	>	if (step < MINSTEP) {                   /* not worth cropping? */
796	>	yl->min = 0;
797	>	yl->max = numscans(&tresolu) - 1;
798	>	x = scanlen(&tresolu) - 1;
799	>	for (y = numscans(&tresolu); y--; ) {
800	>	xl[y].min = 0;
801	>	xl[y].max = x;
802		}
803	+	return(1);
804		}
805	+	yl->min = 32000; yl->max = 0;           /* search for points on image */
806	+	for (y = step - 1; y < numscans(&tresolu); y += step) {
807	+	if (zfd != -1) {
808	+	if (lseek(zfd, (off_t)y*scanlen(&tresolu)*sizeof(float),
809	+	SEEK_SET) < 0)
810	+	syserror("lseek");
811	+	if (read(zfd, (char *)zline,
812	+	scanlen(&tresolu)*sizeof(float))
813	+	< scanlen(&tresolu)*sizeof(float))
814	+	syserror("read");
815	+	}
816	+	xl[y].min = 32000; xl[y].max = 0;               /* x max */
817	+	for (x = scanlen(&tresolu); (x -= step) > 0; ) {
818	+	pix2loc(pos, &tresolu, x, y);
819	+	pos[2] = zline[x];
820	+	if (movepixel(pos) > FTINY) {
821	+	xl[y].max = x + step - 1;
822	+	xl[y].min = x - step + 1;       /* x min */
823	+	if (xl[y].min < 0)
824	+	xl[y].min = 0;
825	+	for (x = step - 1; x < xl[y].max; x += step) {
826	+	pix2loc(pos, &tresolu, x, y);
827	+	pos[2] = zline[x];
828	+	if (movepixel(pos) > FTINY) {
829	+	xl[y].min = x - step + 1;
830	+	break;
831	+	}
832	+	}
833	+	if (y < yl->min)                /* y limits */
834	+	yl->min = y - step + 1;
835	+	yl->max = y + step - 1;
836	+	break;
837	+	}
838	+	}
839	+	/* fill in between */
840	+	if (y < step) {
841	+	xl[y-1].min = xl[y].min;
842	+	xl[y-1].max = xl[y].max;
843	+	} else {
844	+	if (xl[y].min < xl[y-step].min)
845	+	xl[y-1].min = xl[y].min;
846	+	else
847	+	xl[y-1].min = xl[y-step].min;
848	+	if (xl[y].max > xl[y-step].max)
849	+	xl[y-1].max = xl[y].max;
850	+	else
851	+	xl[y-1].max = xl[y-step].max;
852	+	}
853	+	for (x = 2; x < step; x++)
854	+	*(xl+y-x) = *(xl+y-1);
855	+	}
856	+	if (yl->max >= numscans(&tresolu))
857	+	yl->max = numscans(&tresolu) - 1;
858	+	y -= step;
859	+	for (x = numscans(&tresolu) - 1; x > y; x--)    /* fill bottom rows */
860	+	*(xl+x) = *(xl+y);
861	+	return(yl->max >= yl->min);
862		}
863
864
865	<	fillpicture()                           /* fill in empty spaces */
865	>	static void
866	>	backpicture(                    /* background fill algorithm */
867	>	fillfunc_t *fill,
868	>	int     samp
869	>	)
870		{
871		int     *yback, xback;
872		int     y;
319	–	COLR    pfill;
873		register int    x, i;
874		/* get back buffer */
875	<	yback = (int *)malloc(ourview.hresolu*sizeof(int));
876	<	if (yback == NULL) {
877	<	perror(progname);
878	<	return;
326	<	}
327	<	for (x = 0; x < ourview.hresolu; x++)
875	>	yback = (int *)malloc(hresolu*sizeof(int));
876	>	if (yback == NULL)
877	>	syserror(progname);
878	>	for (x = 0; x < hresolu; x++)
879		yback[x] = -2;
880	+	/*
881	+	* Xback and yback are the pixel locations of suitable
882	+	* background values in each direction.
883	+	* A value of -2 means unassigned, and -1 means
884	+	* that there is no suitable background in this direction.
885	+	*/
886		/* fill image */
887	<	for (y = 0; y < ourview.vresolu; y++) {
887	>	for (y = 0; y < vresolu; y++) {
888		xback = -2;
889	<	for (x = 0; x < ourview.hresolu; x++)
890	<	if (zscan(y)[x] <= 0.0) {       /* empty pixel */
889	>	for (x = 0; x < hresolu; x++)
890	>	if (zscan(y)[x] <= 0) {         /* empty pixel */
891	>	/*
892	>	* First, find background from above or below.
893	>	* (farthest assigned pixel)
894	>	*/
895		if (yback[x] == -2) {
896	<	for (i = y+1; i < ourview.vresolu; i++)
897	<	if (zscan(i)[x] > 0.0)
896	>	for (i = y+1; i < vresolu; i++)
897	>	if (zscan(i)[x] > 0)
898		break;
899	<	if (i < ourview.vresolu
899	>	if (i < vresolu
900		&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x]))
901		yback[x] = i;
902		else
903		yback[x] = y-1;
904		}
905	+	/*
906	+	* Next, find background from left or right.
907	+	*/
908		if (xback == -2) {
909	<	for (i = x+1; x < ourview.hresolu; i++)
910	<	if (zscan(y)[i] > 0.0)
909	>	for (i = x+1; i < hresolu; i++)
910	>	if (zscan(y)[i] > 0)
911		break;
912	<	if (i < ourview.hresolu
912	>	if (i < hresolu
913		&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i]))
914		xback = i;
915		else
916		xback = x-1;
917		}
918	+	/*
919	+	* If we have no background for this pixel,
920	+	* use the given fill function.
921	+	*/
922		if (xback < 0 && yback[x] < 0)
923	<	continue;
924	<	if (yback[x] < 0 || ABS(x-xback) <= 1
923	>	goto fillit;
924	>	/*
925	>	* Compare, and use the background that is
926	>	* farther, unless one of them is next to us.
927	>	* If the background is too distant, call
928	>	* the fill function.
929	>	*/
930	>	if ( yback[x] < 0
931	>	|| (xback >= 0 && ABS(x-xback) <= 1)
932		|| ( ABS(y-yback[x]) > 1
933	<	&& zscan(yback[x])[x] < zscan(y)[xback] ))
934	<	copycolr(pscan(y)[x],pscan(y)[xback]);
935	<	else
936	<	copycolr(pscan(y)[x],pscan(yback[x])[x]);
933	>	&& zscan(yback[x])[x]
934	>	< zscan(y)[xback] ) ) {
935	>	if (samp > 0 && ABS(x-xback) >= samp)
936	>	goto fillit;
937	>	if (averaging) {
938	>	copycolor(sscan(y)[x],
939	>	sscan(y)[xback]);
940	>	wscan(y)[x] = wscan(y)[xback];
941	>	} else
942	>	copycolr(pscan(y)[x],
943	>	pscan(y)[xback]);
944	>	zscan(y)[x] = zscan(y)[xback];
945	>	} else {
946	>	if (samp > 0 && ABS(y-yback[x]) > samp)
947	>	goto fillit;
948	>	if (averaging) {
949	>	copycolor(sscan(y)[x],
950	>	sscan(yback[x])[x]);
951	>	wscan(y)[x] =
952	>	wscan(yback[x])[x];
953	>	} else
954	>	copycolr(pscan(y)[x],
955	>	pscan(yback[x])[x]);
956	>	zscan(y)[x] = zscan(yback[x])[x];
957	>	}
958	>	continue;
959	>	fillit:
960	>	(*fill)(x,y);
961	>	if (fill == rcalfill) {         /* use it */
962	>	clearqueue();
963	>	xback = x;
964	>	yback[x] = y;
965	>	}
966		} else {                                /* full pixel */
967		yback[x] = -2;
968		xback = -2;
969		}
970		}
971	<	free((char *)yback);
971	>	free((void *)yback);
972		}
973
974
975	<	writepicture()                          /* write out picture */
975	>	static void
976	>	fillpicture(            /* paint in empty pixels using fill */
977	>	fillfunc_t *fill
978	>	)
979		{
980	+	register int    x, y;
981	+
982	+	for (y = 0; y < vresolu; y++)
983	+	for (x = 0; x < hresolu; x++)
984	+	if (zscan(y)[x] <= 0)
985	+	(*fill)(x,y);
986	+	if (fill == rcalfill)
987	+	clearqueue();
988	+	}
989	+
990	+
991	+	static int
992	+	clipaft(void)                   /* perform aft clipping as indicated */
993	+	{
994	+	register int    x, y;
995	+	int     adjtest = (ourview.type == VT_PER) & zisnorm;
996	+	double  tstdist;
997	+	double  yzn2, vx;
998	+
999	+	if (ourview.vaft <= FTINY)
1000	+	return(0);
1001	+	tstdist = ourview.vaft - ourview.vfore;
1002	+	for (y = 0; y < vresolu; y++) {
1003	+	if (adjtest) {                          /* adjust test */
1004	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1005	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1006	+	tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2);
1007	+	}
1008	+	for (x = 0; x < hresolu; x++)
1009	+	if (zscan(y)[x] > tstdist) {
1010	+	if (adjtest) {
1011	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
1012	+	if (zscan(y)[x] <= (ourview.vaft -
1013	+	ourview.vfore) *
1014	+	sqrt(vx*vx*ourview.hn2 + yzn2))
1015	+	continue;
1016	+	}
1017	+	if (averaging)
1018	+	memset(sscan(y)[x], '\0', sizeof(COLOR));
1019	+	else
1020	+	memset(pscan(y)[x], '\0', sizeof(COLR));
1021	+	zscan(y)[x] = 0.0;
1022	+	}
1023	+	}
1024	+	return(1);
1025	+	}
1026	+
1027	+
1028	+	static int
1029	+	addblur(void)                           /* add to blurred picture */
1030	+	{
1031	+	COLOR   cval;
1032	+	double  d;
1033	+	register int    i;
1034	+
1035	+	if (!blurring)
1036	+	return(0);
1037	+	i = hresolu*vresolu;
1038	+	if (nvavg < 2)
1039	+	if (averaging)
1040	+	while (i--) {
1041	+	copycolor(ourbpict[i], ourspict[i]);
1042	+	d = 1.0/ourweigh[i];
1043	+	scalecolor(ourbpict[i], d);
1044	+	}
1045	+	else
1046	+	while (i--)
1047	+	colr_color(ourbpict[i], ourpict[i]);
1048	+	else
1049	+	if (averaging)
1050	+	while (i--) {
1051	+	copycolor(cval, ourspict[i]);
1052	+	d = 1.0/ourweigh[i];
1053	+	scalecolor(cval, d);
1054	+	addcolor(ourbpict[i], cval);
1055	+	}
1056	+	else
1057	+	while (i--) {
1058	+	colr_color(cval, ourpict[i]);
1059	+	addcolor(ourbpict[i], cval);
1060	+	}
1061	+	/* print view */
1062	+	printf("VIEW%d:", nvavg);
1063	+	fprintview(&ourview, stdout);
1064	+	putchar('\n');
1065	+	return(1);
1066	+	}
1067	+
1068	+
1069	+	static void
1070	+	writepicture(void)                              /* write out picture (alters buffer) */
1071	+	{
1072		int     y;
1073	+	register int    x;
1074	+	double  d;
1075
1076	<	fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout);
1077	<	for (y = ourview.vresolu-1; y >= 0; y--)
1078	<	if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) {
1079	<	perror(progname);
1080	<	exit(1);
1076	>	fprtresolu(hresolu, vresolu, stdout);
1077	>	for (y = vresolu-1; y >= 0; y--)
1078	>	if (blurring) {
1079	>	for (x = 0; x < hresolu; x++) { /* compute avg. */
1080	>	d = rexpadj/nvavg;
1081	>	scalecolor(bscan(y)[x], d);
1082	>	}
1083	>	if (fwritescan(bscan(y), hresolu, stdout) < 0)
1084	>	syserror(progname);
1085	>	} else if (averaging) {
1086	>	for (x = 0; x < hresolu; x++) { /* average pixels */
1087	>	d = rexpadj/wscan(y)[x];
1088	>	scalecolor(sscan(y)[x], d);
1089	>	}
1090	>	if (fwritescan(sscan(y), hresolu, stdout) < 0)
1091	>	syserror(progname);
1092	>	} else {
1093	>	if (expadj)
1094	>	shiftcolrs(pscan(y), hresolu, expadj);
1095	>	if (fwritecolrs(pscan(y), hresolu, stdout) < 0)
1096	>	syserror(progname);
1097		}
1098	+	}
1099	+
1100	+
1101	+	static void
1102	+	writedistance(                  /* write out z file (alters buffer) */
1103	+	char    *fname
1104	+	)
1105	+	{
1106	+	int     donorm = normdist & !zisnorm ? 1 :
1107	+	(ourview.type == VT_PER) & !normdist & zisnorm ? -1 : 0;
1108	+	int     fd;
1109	+	int     y;
1110	+
1111	+	if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
1112	+	syserror(fname);
1113	+	for (y = vresolu-1; y >= 0; y--) {
1114	+	if (donorm) {
1115	+	double  vx, yzn2, d;
1116	+	register int    x;
1117	+	yzn2 = (y+.5)/vresolu + ourview.voff - .5;
1118	+	yzn2 = 1. + yzn2*yzn2*ourview.vn2;
1119	+	for (x = 0; x < hresolu; x++) {
1120	+	vx = (x+.5)/hresolu + ourview.hoff - .5;
1121	+	d = sqrt(vx*vx*ourview.hn2 + yzn2);
1122	+	if (donorm > 0)
1123	+	zscan(y)[x] *= d;
1124	+	else
1125	+	zscan(y)[x] /= d;
1126	+	}
1127	+	}
1128	+	if (write(fd, (char *)zscan(y), hresolu*sizeof(float))
1129	+	< hresolu*sizeof(float))
1130	+	syserror(fname);
1131	+	}
1132	+	close(fd);
1133	+	}
1134	+
1135	+
1136	+	static void
1137	+	backfill(                               /* fill pixel with background */
1138	+	int     x,
1139	+	int     y
1140	+	)
1141	+	{
1142	+	if (averaging) {
1143	+	copycolor(sscan(y)[x], backcolor);
1144	+	wscan(y)[x] = 1;
1145	+	} else
1146	+	copycolr(pscan(y)[x], backcolr);
1147	+	zscan(y)[x] = backz;
1148	+	}
1149	+
1150	+
1151	+	static void
1152	+	calstart(                    /* start fill calculation */
1153	+	char    *prog,
1154	+	char    *args
1155	+	)
1156	+	{
1157	+	char    combuf[512];
1158	+	char    *argv[64];
1159	+	int     rval;
1160	+	register char   **wp, *cp;
1161	+
1162	+	if (PDesc.running) {
1163	+	fprintf(stderr, "%s: too many calculations\n", progname);
1164	+	exit(1);
1165	+	}
1166	+	strcpy(combuf, prog);
1167	+	strcat(combuf, args);
1168	+	cp = combuf;
1169	+	wp = argv;
1170	+	for ( ; ; ) {
1171	+	while (isspace(*cp))    /* nullify spaces */
1172	+	*cp++ = '\0';
1173	+	if (!*cp)               /* all done? */
1174	+	break;
1175	+	*wp++ = cp;             /* add argument to list */
1176	+	while (*++cp && !isspace(*cp))
1177	+	;
1178	+	}
1179	+	*wp = NULL;
1180	+	/* start process */
1181	+	if ((rval = open_process(&PDesc, argv)) < 0)
1182	+	syserror(progname);
1183	+	if (rval == 0) {
1184	+	fprintf(stderr, "%s: command not found\n", argv[0]);
1185	+	exit(1);
1186	+	}
1187	+	packsiz = rval/(6*sizeof(float)) - 1;
1188	+	if (packsiz > PACKSIZ)
1189	+	packsiz = PACKSIZ;
1190	+	queuesiz = 0;
1191	+	}
1192	+
1193	+
1194	+	static void
1195	+	caldone(void)                               /* done with calculation */
1196	+	{
1197	+	if (!PDesc.running)
1198	+	return;
1199	+	clearqueue();
1200	+	close_process(&PDesc);
1201	+	}
1202	+
1203	+
1204	+	static void
1205	+	rcalfill(                               /* fill with ray-calculated pixel */
1206	+	int     x,
1207	+	int     y
1208	+	)
1209	+	{
1210	+	if (queuesiz >= packsiz)        /* flush queue if needed */
1211	+	clearqueue();
1212	+	/* add position to queue */
1213	+	queue[queuesiz][0] = x;
1214	+	queue[queuesiz][1] = y;
1215	+	queuesiz++;
1216	+	}
1217	+
1218	+
1219	+	static void
1220	+	clearqueue(void)                                /* process queue */
1221	+	{
1222	+	FVECT   orig, dir;
1223	+	float   fbuf[6*(PACKSIZ+1)];
1224	+	register float  *fbp;
1225	+	register int    i;
1226	+	double  vx, vy;
1227	+
1228	+	if (queuesiz == 0)
1229	+	return;
1230	+	fbp = fbuf;
1231	+	for (i = 0; i < queuesiz; i++) {
1232	+	viewray(orig, dir, &ourview,
1233	+	(queue[i][0]+.5)/hresolu,
1234	+	(queue[i][1]+.5)/vresolu);
1235	+	*fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2];
1236	+	*fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2];
1237	+	}
1238	+	/* mark end and get results */
1239	+	memset((char *)fbp, '\0', 6*sizeof(float));
1240	+	if (process(&PDesc, (char *)fbuf, (char *)fbuf,
1241	+	4*sizeof(float)*(queuesiz+1),
1242	+	6*sizeof(float)*(queuesiz+1)) !=
1243	+	4*sizeof(float)*(queuesiz+1)) {
1244	+	fprintf(stderr, "%s: error reading from rtrace process\n",
1245	+	progname);
1246	+	exit(1);
1247	+	}
1248	+	fbp = fbuf;
1249	+	for (i = 0; i < queuesiz; i++) {
1250	+	if (ourexp > 0 && ourexp != 1.0) {
1251	+	fbp[0] *= ourexp;
1252	+	fbp[1] *= ourexp;
1253	+	fbp[2] *= ourexp;
1254	+	}
1255	+	if (averaging) {
1256	+	setcolor(sscan(queue[i][1])[queue[i][0]],
1257	+	fbp[0], fbp[1], fbp[2]);
1258	+	wscan(queue[i][1])[queue[i][0]] = 1;
1259	+	} else
1260	+	setcolr(pscan(queue[i][1])[queue[i][0]],
1261	+	fbp[0], fbp[1], fbp[2]);
1262	+	if (zisnorm)
1263	+	zscan(queue[i][1])[queue[i][0]] = fbp[3];
1264	+	else {
1265	+	vx = (queue[i][0]+.5)/hresolu + ourview.hoff - .5;
1266	+	vy = (queue[i][1]+.5)/vresolu + ourview.voff - .5;
1267	+	zscan(queue[i][1])[queue[i][0]] = fbp[3] / sqrt(1. +
1268	+	vx*vx*ourview.hn2 + vy*vy*ourview.vn2);
1269	+	}
1270	+	fbp += 4;
1271	+	}
1272	+	queuesiz = 0;
1273	+	}
1274	+
1275	+
1276	+	static void
1277	+	syserror(                       /* report error and exit */
1278	+	char    *s
1279	+	)
1280	+	{
1281	+	perror(s);
1282	+	exit(1);
1283		}

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