src/util/rpiece.c

/* Copyright (c) 1992 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 * Generate sections of a picture.
 */
 
#include "standard.h"
#include <fcntl.h>

#ifndef F_SETLKW

main(argc, argv)
int argc;
char *argv[];
{
        fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
        exit(1);
}

#else

#include <signal.h>
#include "color.h"
#include "view.h"
#include "resolu.h"

#ifndef NFS
#define  NFS                    1
#endif
                                /* set the following to 0 to forgo forking */
#ifndef MAXFORK
#if NFS
#define  MAXFORK                3       /* allotment of duped processes */
#else
#define  MAXFORK                0
#endif
#endif

                                /* rpict command */
char  *rpargv[128] = {"rpict", "-S", "1", "-x", "512", "-y", "512", "-pa", "1"};
int  rpargc = 9;
int  rpd[3];
FILE  *torp, *fromrp;
COLR  *pbuf;
                                /* our view parameters */
VIEW  ourview = STDVIEW;
double  pixaspect = 1.0;
int  hres = 512, vres = 512, hmult = 2, vmult = 2;
                                /* output file */
char  *outfile = NULL;
int  outfd;
long  scanorig;
int  syncfd = -1;               /* lock file descriptor */
int  nforked = 0;

char  *progname;
int  verbose = 0;

extern long  lseek(), ftell();

int  gotalrm = 0;
int  onalrm() { gotalrm++; }


main(argc, argv)
int  argc;
char  *argv[];
{
        register int  i, rval;
        
        progname = argv[0];
        for (i = 1; i < argc; i++) {
                if (argv[i][0] == '-')
                        switch (argv[i][1]) {
                        case 'v':
                                switch (argv[i][2]) {
                                case '\0':      /* verbose option */
                                        verbose = !verbose;
                                        continue;
                                case 'f':       /* view file */
                                        if (viewfile(argv[++i], &ourview, NULL) <= 0) {
                                                fprintf(stderr,
                                        "%s: not a view file\n", argv[i]);
                                                exit(1);
                                        }
                                        continue;
                                default:        /* view option? */
                                        rval = getviewopt(&ourview, argc-i, argv+i);
                                        if (rval >= 0) {
                                                i += rval;
                                                continue;
                                        }
                                        break;
                                }
                                break;
                        case 'p':               /* pixel aspect ratio? */
                                if (argv[i][2] == 'a' && !argv[i][3])
                                        pixaspect = atof(argv[i+1]);
                                break;
                        case 'x':               /* piece x resolution */
                                if (!argv[i][2])
                                        hres = atoi(argv[i+1]);
                                break;
                        case 'y':               /* piece y resolution */
                                if (!argv[i][2])
                                        vres = atoi(argv[i+1]);
                                break;
                        case 'X':               /* horizontal multiplier */
                                if (argv[i][2])
                                        break;
                                hmult = atoi(argv[++i]);
                                continue;
                        case 'Y':               /* vertical multiplier */
                                if (argv[i][2])
                                        break;
                                vmult = atoi(argv[++i]);
                                continue;
                        case 'F':               /* syncronization file */
                                if (argv[i][2])
                                        break;
                                if ((syncfd = open(argv[++i],
                                                O_RDWR|O_CREAT, 0666)) < 0) {
                                        fprintf(stderr, "%s: cannot open\n",
                                                        argv[i]);
                                        exit(1);
                                }
                                continue;
                        case 'z':               /* z-file ist verbotten */
                                fprintf(stderr, "%s: -z option not allowed\n",
                                                argv[0]);
                                exit(1);
                        case 'o':               /* output file */
                                if (argv[i][2])
                                        break;
                                outfile = argv[++i];
                                continue;
                        }
                rpargv[rpargc++] = argv[i];
        }
        rpargv[rpargc] = NULL;
        if (outfile == NULL) {
                fprintf(stderr, "%s: missing output file\n", argv[0]);
                exit(1);
        }
        init(argc, argv);
        rpiece();
        exit(cleanup(0));
}


init(ac, av)                    /* set up output file and start rpict */
int  ac;
char  **av;
{
        extern char  VersionID[];
        char  *err;
        FILE  *fp;
        int  hr, vr;
                                        /* set up view */
        if ((err = setview(&ourview)) != NULL) {
                fprintf(stderr, "%s: %s\n", progname, err);
                exit(1);
        }
        if (syncfd != -1) {
                char  buf[32];
                buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
                sscanf(buf, "%d %d", &hmult, &vmult);
        }
        normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
                                        /* open output file */
        if ((outfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0666)) >= 0) {
                if ((fp = fdopen(dup(outfd), "w")) == NULL)
                        goto filerr;
                printargs(ac, av, fp);          /* write header */
                fprintf(fp, "SOFTWARE= %s\n", VersionID);
                fputs(VIEWSTR, fp);
                fprintview(&ourview, fp);
                putc('\n', fp);
                if (pixaspect < .99 || pixaspect > 1.01)
                        fputaspect(pixaspect, fp);
                fputformat(COLRFMT, fp);
                putc('\n', fp);
                fprtresolu(hres*hmult, vres*vmult, fp);
        } else if ((outfd = open(outfile, O_RDWR)) >= 0) {
                if ((fp = fdopen(dup(outfd), "r+")) == NULL)
                        goto filerr;
                getheader(fp, NULL, NULL);      /* skip header */
                if (!fscnresolu(&hr, &vr, fp) ||        /* check resolution */
                                hr != hres*hmult || vr != vres*vmult) {
                        fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n",
                                        progname, outfile);
                        exit(1);
                }
        } else {
                fprintf(stderr, "%s: cannot open file \"%s\"\n",
                                progname, outfile);
                exit(1);
        }
        scanorig = ftell(fp);           /* record position of first scanline */
        if (fclose(fp) == -1)           /* done with stream i/o */
                goto filerr;
#if NFS
        sync();                         /* flush NFS buffers */
#endif
                                        /* start rpict process */
        if (open_process(rpd, rpargv) <= 0) {
                fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]);
                exit(1);
        }
        if ((fromrp = fdopen(rpd[0], "r")) == NULL ||
                        (torp = fdopen(rpd[1], "w")) == NULL) {
                fprintf(stderr, "%s: cannot open stream to %s\n",
                                progname, rpargv[0]);
                exit(1);
        }
        if ((pbuf = (COLR *)malloc(hres*vres*sizeof(COLR))) == NULL) {
                fprintf(stderr, "%s: out of memory\n", progname);
                exit(1);
        }
        signal(SIGALRM, onalrm);
        return;
filerr:
        fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile);
        exit(1);
}


int
nextpiece(xp, yp)               /* get next piece assignment */
int  *xp, *yp;
{
        extern char  *fgets();
        struct flock  fls;
        char  buf[64];

        if (gotalrm)                    /* someone wants us to quit */
                return(0);
        if (syncfd != -1) {             /* use sync file */
                fls.l_type = F_WRLCK;           /* gain exclusive access */
                fls.l_whence = 0;
                fls.l_start = 0L;
                fls.l_len = 0L;
                fcntl(syncfd, F_SETLKW, &fls);
                lseek(syncfd, 0L, 0);
                buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
                if (sscanf(buf, "%*d %*d %d %d", xp, yp) < 2) {
                        *xp = hmult-1;
                        *yp = vmult;
                }
                if (--(*yp) < 0) {              /* decrement position */
                        *yp = vmult-1;
                        if (--(*xp) < 0) {      /* all done! */
                                close(syncfd);
                                return(0);
                        }
                }
                sprintf(buf, "%4d %4d\n%4d %4d\n", hmult, vmult, *xp, *yp);
                lseek(syncfd, 0L, 0);           /* write new position */
                write(syncfd, buf, strlen(buf));
                fls.l_type = F_UNLCK;           /* release sync file */
                fcntl(syncfd, F_SETLKW, &fls);
                return(1);
        }
        if (fgets(buf, sizeof(buf), stdin) == NULL)     /* use stdin */
                return(0);
        if (sscanf(buf, "%d %d", xp, yp) == 2)
                return(1);
        fprintf(stderr, "%s: input format error\n", progname);
        exit(cleanup(1));
}


int
cleanup(rstat)                  /* close rpict process and clean up */
int  rstat;
{
        int  status;

        free((char *)pbuf);
        fclose(torp);
        fclose(fromrp);
        while (wait(&status) != -1)
                if (rstat == 0)
                        rstat = status>>8 & 0xff;
        return(rstat);
}


rpiece()                        /* render picture piece by piece */
{
        VIEW  pview;
        int  xorg, yorg;
                                        /* compute view parameters */
        copystruct(&pview, &ourview);
        switch (ourview.type) {
        case VT_PER:
                pview.horiz = 2.*180./PI*atan(
                                tan(PI/180./2.*ourview.horiz)/hmult );
                pview.vert = 2.*180./PI*atan(
                                tan(PI/180./2.*ourview.vert)/vmult );
                break;
        case VT_PAR:
        case VT_ANG:
                pview.horiz = ourview.horiz / hmult;
                pview.vert = ourview.vert / vmult;
                break;
        case VT_HEM:
                pview.horiz = 2.*180./PI*asin(
                                sin(PI/180./2.*ourview.horiz)/hmult );
                pview.vert = 2.*180./PI*asin(
                                sin(PI/180./2.*ourview.vert)/vmult );
                break;
        default:
                fprintf(stderr, "%s: unknown view type '-vt%c'\n",
                                progname, ourview.type);
                exit(cleanup(1));
        }
                                        /* render each piece */
        while (nextpiece(&xorg, &yorg)) {
                pview.hoff = ourview.hoff + xorg - 0.5*(hmult-1);
                pview.voff = ourview.voff + yorg - 0.5*(vmult-1);
                fputs(VIEWSTR, torp);
                fprintview(&pview, torp);
                putc('\n', torp);
                fflush(torp);                   /* assigns piece to rpict */
                putpiece(xorg, yorg);           /* place piece in output */
                if (verbose) {                  /* notify caller */
                        printf("%d %d done\n", xorg, yorg);
                        fflush(stdout);
                }
        }
}


int
putpiece(xpos, ypos)            /* get next piece from rpict */
int  xpos, ypos;
{
        struct flock  fls;
        int  pid, status;
        int  hr, vr;
        register int  y;
                                /* check bounds */
        if (xpos < 0 | ypos < 0 | xpos >= hmult | ypos >= vmult) {
                fprintf(stderr, "%s: requested piece (%d,%d) out of range\n",
                                progname, xpos, ypos);
                exit(cleanup(1));
        }
                                /* check header from rpict */
        getheader(fromrp, NULL, NULL);
        if (!fscnresolu(&hr, &vr, fromrp) || hr != hres | vr != vres) {
                fprintf(stderr, "%s: resolution mismatch from %s\n",
                                progname, rpargv[0]);
                exit(cleanup(1));
        }
                                /* load new piece into buffer */
        for (y = 0; y < vr; y++)
                if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
                        fprintf(stderr, "%s: read error from %s\n",
                                        progname, rpargv[0]);
                        exit(cleanup(1));
                }
#if MAXFORK
                                /* fork so we don't slow rpict down */
        if ((pid = fork()) > 0) {
                if (++nforked >= MAXFORK) {
                        wait(&status);          /* reap a child */
                        if (status)
                                exit(cleanup(status>>8 & 0xff));
                        nforked--;
                }
                return(pid);
        }
#else
        pid = -1;               /* no forking */
#endif
        fls.l_len = (long)vres*hmult*hres*sizeof(COLR);
        fls.l_start = scanorig + (vmult-1-ypos)*fls.l_len;
#if NFS
                                /* lock file section so NFS doesn't mess up */
        fls.l_whence = 0;
        fls.l_type = F_WRLCK;
        fcntl(outfd, F_SETLKW, &fls);
#endif
                                /* write new piece to file */
        if (lseek(outfd, fls.l_start+(long)xpos*hres*sizeof(COLR), 0) == -1)
                goto seekerr;
        if (hmult == 1) {
                if (writebuf(outfd, (char *)pbuf,
                                vr*hr*sizeof(COLR)) != vr*hr*sizeof(COLR))
                        goto writerr;
        } else
                for (y = 0; y < vr; y++) {
                        if (writebuf(outfd, (char *)(pbuf+y*hr),
                                        hr*sizeof(COLR)) != hr*sizeof(COLR))
                                goto writerr;
                        if (y < vr-1 && lseek(outfd,
                                        (long)(hmult-1)*hr*sizeof(COLR),
                                        1) == -1)
                                goto seekerr;
                }
        if (pid == -1) {        /* fork failed */
#if NFS
                fls.l_type = F_UNLCK;           /* release lock */
                fcntl(outfd, F_SETLKW, &fls);
#endif
                return(0);
        }
        _exit(0);               /* else exit child process (releasing lock) */
seekerr:
        fprintf(stderr, "%s: seek error on file \"%s\"\n", progname, outfile);
        _exit(1);
writerr:
        fprintf(stderr, "%s: write error on file \"%s\"\n", progname, outfile);
        _exit(1);
}

#endif
Revision:	2.17
Committed:	Sat Feb 20 17:07:35 1993 UTC (32 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.16:	+1 -1 lines
Log Message:	changed format of sync to avoid trailing characters
#	User	Rev	Content
1	greg	2.1	/* Copyright (c) 1992 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* Generate sections of a picture.
9			*/
10
11			#include "standard.h"
12			#include <fcntl.h>
13	greg	2.16
14			#ifndef F_SETLKW
15
16			main(argc, argv)
17			int argc;
18			char *argv[];
19			{
20			fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
21			exit(1);
22			}
23
24			#else
25
26	greg	2.6	#include <signal.h>
27	greg	2.1	#include "color.h"
28			#include "view.h"
29			#include "resolu.h"
30
31	greg	2.12	#ifndef NFS
32			#define NFS 1
33			#endif
34	greg	2.9	/* set the following to 0 to forgo forking */
35			#ifndef MAXFORK
36	greg	2.12	#if NFS
37	greg	2.10	#define MAXFORK 3 /* allotment of duped processes */
38	greg	2.12	#else
39			#define MAXFORK 0
40	greg	2.9	#endif
41	greg	2.12	#endif
42	greg	2.9
43	greg	2.1	/* rpict command */
44	greg	2.4	char *rpargv[128] = {"rpict", "-S", "1", "-x", "512", "-y", "512", "-pa", "1"};
45			int rpargc = 9;
46	greg	2.1	int rpd[3];
47			FILE torp, fromrp;
48	greg	2.8	COLR *pbuf;
49	greg	2.1	/* our view parameters */
50			VIEW ourview = STDVIEW;
51	greg	2.4	double pixaspect = 1.0;
52	greg	2.1	int hres = 512, vres = 512, hmult = 2, vmult = 2;
53			/* output file */
54			char *outfile = NULL;
55			int outfd;
56			long scanorig;
57	greg	2.5	int syncfd = -1; /* lock file descriptor */
58	greg	2.9	int nforked = 0;
59	greg	2.1
60			char *progname;
61			int verbose = 0;
62
63			extern long lseek(), ftell();
64
65	greg	2.6	int gotalrm = 0;
66			int onalrm() { gotalrm++; }
67	greg	2.1
68	greg	2.6
69	greg	2.1	main(argc, argv)
70			int argc;
71			char *argv[];
72			{
73			register int i, rval;
74
75			progname = argv[0];
76			for (i = 1; i < argc; i++) {
77			if (argv[i][0] == '-')
78			switch (argv[i][1]) {
79			case 'v':
80			switch (argv[i][2]) {
81			case '\0': /* verbose option */
82			verbose = !verbose;
83			continue;
84			case 'f': /* view file */
85			if (viewfile(argv[++i], &ourview, NULL) <= 0) {
86			fprintf(stderr,
87			"%s: not a view file\n", argv[i]);
88			exit(1);
89			}
90			continue;
91			default: /* view option? */
92			rval = getviewopt(&ourview, argc-i, argv+i);
93			if (rval >= 0) {
94			i += rval;
95			continue;
96			}
97			break;
98			}
99			break;
100			case 'p': /* pixel aspect ratio? */
101			if (argv[i][2] == 'a' && !argv[i][3])
102			pixaspect = atof(argv[i+1]);
103			break;
104			case 'x': /* piece x resolution */
105			if (!argv[i][2])
106			hres = atoi(argv[i+1]);
107			break;
108			case 'y': /* piece y resolution */
109			if (!argv[i][2])
110			vres = atoi(argv[i+1]);
111			break;
112			case 'X': /* horizontal multiplier */
113			if (argv[i][2])
114			break;
115			hmult = atoi(argv[++i]);
116			continue;
117			case 'Y': /* vertical multiplier */
118			if (argv[i][2])
119			break;
120			vmult = atoi(argv[++i]);
121			continue;
122	greg	2.5	case 'F': /* syncronization file */
123			if (argv[i][2])
124			break;
125	greg	2.14	if ((syncfd = open(argv[++i],
126			O_RDWR\|O_CREAT, 0666)) < 0) {
127	greg	2.5	fprintf(stderr, "%s: cannot open\n",
128			argv[i]);
129			exit(1);
130			}
131			continue;
132	greg	2.15	case 'z': /* z-file ist verbotten */
133			fprintf(stderr, "%s: -z option not allowed\n",
134			argv[0]);
135			exit(1);
136	greg	2.1	case 'o': /* output file */
137			if (argv[i][2])
138			break;
139			outfile = argv[++i];
140			continue;
141			}
142			rpargv[rpargc++] = argv[i];
143			}
144			rpargv[rpargc] = NULL;
145			if (outfile == NULL) {
146			fprintf(stderr, "%s: missing output file\n", argv[0]);
147			exit(1);
148			}
149			init(argc, argv);
150			rpiece();
151	greg	2.15	exit(cleanup(0));
152	greg	2.1	}
153
154
155			init(ac, av) /* set up output file and start rpict */
156			int ac;
157			char **av;
158			{
159	greg	2.2	extern char VersionID[];
160	greg	2.1	char *err;
161			FILE *fp;
162			int hr, vr;
163			/* set up view */
164			if ((err = setview(&ourview)) != NULL) {
165			fprintf(stderr, "%s: %s\n", progname, err);
166			exit(1);
167			}
168	greg	2.5	if (syncfd != -1) {
169			char buf[32];
170			buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
171			sscanf(buf, "%d %d", &hmult, &vmult);
172			}
173	greg	2.1	normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
174			/* open output file */
175			if ((outfd = open(outfile, O_WRONLY\|O_CREAT\|O_EXCL, 0666)) >= 0) {
176			if ((fp = fdopen(dup(outfd), "w")) == NULL)
177			goto filerr;
178			printargs(ac, av, fp); /* write header */
179	greg	2.2	fprintf(fp, "SOFTWARE= %s\n", VersionID);
180	greg	2.1	fputs(VIEWSTR, fp);
181			fprintview(&ourview, fp);
182			putc('\n', fp);
183			if (pixaspect < .99 \|\| pixaspect > 1.01)
184			fputaspect(pixaspect, fp);
185			fputformat(COLRFMT, fp);
186			putc('\n', fp);
187			fprtresolu(hreshmult, vresvmult, fp);
188			} else if ((outfd = open(outfile, O_RDWR)) >= 0) {
189			if ((fp = fdopen(dup(outfd), "r+")) == NULL)
190			goto filerr;
191	greg	2.13	getheader(fp, NULL, NULL); /* skip header */
192	greg	2.15	if (!fscnresolu(&hr, &vr, fp) \|\| /* check resolution */
193	greg	2.1	hr != hreshmult \|\| vr != vresvmult) {
194	greg	2.8	fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n",
195			progname, outfile);
196	greg	2.1	exit(1);
197			}
198			} else {
199	greg	2.8	fprintf(stderr, "%s: cannot open file \"%s\"\n",
200			progname, outfile);
201	greg	2.1	exit(1);
202			}
203			scanorig = ftell(fp); /* record position of first scanline */
204			if (fclose(fp) == -1) /* done with stream i/o */
205			goto filerr;
206	greg	2.12	#if NFS
207	greg	2.8	sync(); /* flush NFS buffers */
208	greg	2.12	#endif
209	greg	2.1	/* start rpict process */
210			if (open_process(rpd, rpargv) <= 0) {
211	greg	2.3	fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]);
212	greg	2.1	exit(1);
213			}
214			if ((fromrp = fdopen(rpd[0], "r")) == NULL \|\|
215			(torp = fdopen(rpd[1], "w")) == NULL) {
216			fprintf(stderr, "%s: cannot open stream to %s\n",
217			progname, rpargv[0]);
218			exit(1);
219			}
220	greg	2.8	if ((pbuf = (COLR )malloc(hresvres*sizeof(COLR))) == NULL) {
221	greg	2.1	fprintf(stderr, "%s: out of memory\n", progname);
222			exit(1);
223			}
224	greg	2.6	signal(SIGALRM, onalrm);
225	greg	2.1	return;
226			filerr:
227	greg	2.8	fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile);
228	greg	2.1	exit(1);
229			}
230
231
232			int
233	greg	2.5	nextpiece(xp, yp) /* get next piece assignment */
234			int xp, yp;
235			{
236			extern char *fgets();
237			struct flock fls;
238			char buf[64];
239
240	greg	2.6	if (gotalrm) /* someone wants us to quit */
241			return(0);
242			if (syncfd != -1) { /* use sync file */
243	greg	2.5	fls.l_type = F_WRLCK; /* gain exclusive access */
244			fls.l_whence = 0;
245			fls.l_start = 0L;
246			fls.l_len = 0L;
247			fcntl(syncfd, F_SETLKW, &fls);
248			lseek(syncfd, 0L, 0);
249			buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
250			if (sscanf(buf, "%d %d %d %d", xp, yp) < 2) {
251	greg	2.8	*xp = hmult-1;
252			*yp = vmult;
253			}
254			if (--(yp) < 0) { / decrement position */
255	greg	2.5	*yp = vmult-1;
256	greg	2.8	if (--(xp) < 0) { / all done! */
257	greg	2.5	close(syncfd);
258			return(0);
259			}
260			}
261	greg	2.17	sprintf(buf, "%4d %4d\n%4d %4d\n", hmult, vmult, xp, yp);
262	greg	2.5	lseek(syncfd, 0L, 0); /* write new position */
263			write(syncfd, buf, strlen(buf));
264			fls.l_type = F_UNLCK; /* release sync file */
265			fcntl(syncfd, F_SETLKW, &fls);
266			return(1);
267			}
268	greg	2.6	if (fgets(buf, sizeof(buf), stdin) == NULL) /* use stdin */
269	greg	2.5	return(0);
270			if (sscanf(buf, "%d %d", xp, yp) == 2)
271			return(1);
272			fprintf(stderr, "%s: input format error\n", progname);
273	greg	2.10	exit(cleanup(1));
274	greg	2.5	}
275
276
277			int
278	greg	2.10	cleanup(rstat) /* close rpict process and clean up */
279			int rstat;
280	greg	2.1	{
281	greg	2.10	int status;
282	greg	2.1
283	greg	2.8	free((char *)pbuf);
284	greg	2.1	fclose(torp);
285			fclose(fromrp);
286	greg	2.10	while (wait(&status) != -1)
287	greg	2.9	if (rstat == 0)
288			rstat = status>>8 & 0xff;
289			return(rstat);
290	greg	2.1	}
291
292
293			rpiece() /* render picture piece by piece */
294			{
295			VIEW pview;
296			int xorg, yorg;
297	greg	2.11	/* compute view parameters */
298			copystruct(&pview, &ourview);
299			switch (ourview.type) {
300			case VT_PER:
301			pview.horiz = 2.180./PIatan(
302			tan(PI/180./2.*ourview.horiz)/hmult );
303			pview.vert = 2.180./PIatan(
304			tan(PI/180./2.*ourview.vert)/vmult );
305			break;
306			case VT_PAR:
307			case VT_ANG:
308			pview.horiz = ourview.horiz / hmult;
309			pview.vert = ourview.vert / vmult;
310			break;
311			case VT_HEM:
312			pview.horiz = 2.180./PIasin(
313			sin(PI/180./2.*ourview.horiz)/hmult );
314			pview.vert = 2.180./PIasin(
315			sin(PI/180./2.*ourview.vert)/vmult );
316			break;
317			default:
318			fprintf(stderr, "%s: unknown view type '-vt%c'\n",
319			progname, ourview.type);
320			exit(cleanup(1));
321			}
322			/* render each piece */
323	greg	2.5	while (nextpiece(&xorg, &yorg)) {
324	greg	2.11	pview.hoff = ourview.hoff + xorg - 0.5*(hmult-1);
325			pview.voff = ourview.voff + yorg - 0.5*(vmult-1);
326	greg	2.1	fputs(VIEWSTR, torp);
327			fprintview(&pview, torp);
328			putc('\n', torp);
329	greg	2.11	fflush(torp); /* assigns piece to rpict */
330	greg	2.1	putpiece(xorg, yorg); /* place piece in output */
331			if (verbose) { /* notify caller */
332	greg	2.5	printf("%d %d done\n", xorg, yorg);
333			fflush(stdout);
334	greg	2.1	}
335			}
336			}
337
338
339	greg	2.9	int
340	greg	2.1	putpiece(xpos, ypos) /* get next piece from rpict */
341			int xpos, ypos;
342			{
343	greg	2.7	struct flock fls;
344	greg	2.9	int pid, status;
345	greg	2.1	int hr, vr;
346	greg	2.8	register int y;
347			/* check bounds */
348	greg	2.5	if (xpos < 0 \| ypos < 0 \| xpos >= hmult \| ypos >= vmult) {
349			fprintf(stderr, "%s: requested piece (%d,%d) out of range\n",
350			progname, xpos, ypos);
351	greg	2.10	exit(cleanup(1));
352	greg	2.5	}
353	greg	2.8	/* check header from rpict */
354	greg	2.13	getheader(fromrp, NULL, NULL);
355	greg	2.15	if (!fscnresolu(&hr, &vr, fromrp) \|\| hr != hres \| vr != vres) {
356	greg	2.3	fprintf(stderr, "%s: resolution mismatch from %s\n",
357			progname, rpargv[0]);
358	greg	2.10	exit(cleanup(1));
359	greg	2.1	}
360	greg	2.8	/* load new piece into buffer */
361			for (y = 0; y < vr; y++)
362			if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
363	greg	2.3	fprintf(stderr, "%s: read error from %s\n",
364			progname, rpargv[0]);
365	greg	2.10	exit(cleanup(1));
366	greg	2.1	}
367	greg	2.9	#if MAXFORK
368			/* fork so we don't slow rpict down */
369			if ((pid = fork()) > 0) {
370	greg	2.10	if (++nforked >= MAXFORK) {
371	greg	2.9	wait(&status); /* reap a child */
372			if (status)
373	greg	2.10	exit(cleanup(status>>8 & 0xff));
374	greg	2.9	nforked--;
375			}
376			return(pid);
377			}
378			#else
379			pid = -1; /* no forking */
380			#endif
381	greg	2.15	fls.l_len = (long)vreshmulthres*sizeof(COLR);
382			fls.l_start = scanorig + (vmult-1-ypos)*fls.l_len;
383	greg	2.12	#if NFS
384	greg	2.8	/* lock file section so NFS doesn't mess up */
385			fls.l_whence = 0;
386			fls.l_type = F_WRLCK;
387			fcntl(outfd, F_SETLKW, &fls);
388	greg	2.12	#endif
389	greg	2.8	/* write new piece to file */
390			if (lseek(outfd, fls.l_start+(long)xposhressizeof(COLR), 0) == -1)
391			goto seekerr;
392	greg	2.9	if (hmult == 1) {
393			if (writebuf(outfd, (char *)pbuf,
394			vrhrsizeof(COLR)) != vrhrsizeof(COLR))
395			goto writerr;
396			} else
397			for (y = 0; y < vr; y++) {
398			if (writebuf(outfd, (char )(pbuf+yhr),
399			hrsizeof(COLR)) != hrsizeof(COLR))
400			goto writerr;
401			if (y < vr-1 && lseek(outfd,
402			(long)(hmult-1)hrsizeof(COLR),
403			1) == -1)
404			goto seekerr;
405	greg	2.1	}
406	greg	2.9	if (pid == -1) { /* fork failed */
407	greg	2.12	#if NFS
408	greg	2.9	fls.l_type = F_UNLCK; /* release lock */
409			fcntl(outfd, F_SETLKW, &fls);
410	greg	2.12	#endif
411	greg	2.9	return(0);
412	greg	2.1	}
413	greg	2.9	_exit(0); /* else exit child process (releasing lock) */
414	greg	2.8	seekerr:
415			fprintf(stderr, "%s: seek error on file \"%s\"\n", progname, outfile);
416	greg	2.9	_exit(1);
417			writerr:
418			fprintf(stderr, "%s: write error on file \"%s\"\n", progname, outfile);
419			_exit(1);
420	greg	2.1	}
421	greg	2.16
422			#endif