src/util/rpiece.c

/* Copyright (c) 1993 Regents of the University of California */

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

/*
 * Generate sections of a picture.
 */
 
#include "standard.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
                                        /* protection from SYSV signals(!) */
#if defined(sgi) || defined(hpux)
#define guard_io()      sighold(SIGALRM)
#define unguard()       sigrelse(SIGALRM)
#endif
#ifndef guard_io
#define guard_io()      0
#define unguard()       0
#endif
                                /* rpict command */
char  *rpargv[128] = {"rpict", "-S", "1"};
int  rpargc = 3;
int  rpd[3];
FILE  *torp, *fromrp;
COLR  *pbuf;
                                /* our view parameters */
VIEW  ourview = STDVIEW;
double  pixaspect = 1.0;
int  hres = 1024, vres = 1024, hmult = 4, vmult = 4;
                                /* output file */
char  *outfile = NULL;
int  outfd;
long  scanorig;
FILE  *syncfp = NULL;           /* synchronization file pointer */
int  synclst = F_UNLCK;         /* synchronization file lock status */
int  nforked = 0;

#define  sflock(t)      if ((t)!=synclst) dolock(fileno(syncfp),synclst=t)

char  *progname;
int  verbose = 0;
int  rvrlim = -1;

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++) {
                                                /* expand arguments */
                while (rval = expandarg(&argc, &argv, i))
                        if (rval < 0) {
                                fprintf(stderr, "%s: cannot expand '%s'",
                                                argv[0], argv[i]);
                                exit(1);
                        }
                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])
                                        break;
                                pixaspect = atof(argv[i+1]);
                                continue;
                        case 'x':               /* overall x resolution */
                                if (argv[i][2])
                                        break;
                                hres = atoi(argv[++i]);
                                continue;
                        case 'y':               /* overall y resolution */
                                if (argv[i][2])
                                        break;
                                vres = atoi(argv[++i]);
                                continue;
                        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 'R':               /* recover */
                                if (argv[i][2])
                                        break;
                                rvrlim = 0;
                        /* fall through */
                        case 'F':               /* syncronization file */
                                if (argv[i][2])
                                        break;
                                if ((syncfp = fopen(argv[++i],"r+")) == NULL) {
                                        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;
                        } else if (i >= argc-1)
                                break;
                rpargv[rpargc++] = argv[i];
        }
        if (i >= argc) {
                fprintf(stderr, "%s: missing octree argument\n", argv[0]);
                exit(1);
        }
        if (outfile == NULL) {
                fprintf(stderr, "%s: missing output file\n", argv[0]);
                exit(1);
        }
        init(argc, argv);
        rpiece();
        exit(cleanup(0));
}


dolock(fd, ltyp)                /* lock or unlock a file */
int  fd;
int  ltyp;
{
        static struct flock  fls;       /* static so initialized to zeroes */

        fls.l_type = ltyp;
        if (fcntl(fd, F_SETLKW, &fls) < 0) {
                fprintf(stderr, "%s: cannot lock/unlock file\n", progname);
                exit(1);
        }
}


init(ac, av)                    /* set up output file and start rpict */
int  ac;
char  **av;
{
        static char  hrbuf[16], vrbuf[16];
        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 (syncfp != NULL) {
                sflock(F_RDLCK);
                fscanf(syncfp, "%d %d", &hmult, &vmult);
                sflock(F_UNLCK);
        }
                                        /* compute piece size */
        hres /= hmult;
        vres /= vmult;
        normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
        sprintf(hrbuf, "%d", hres);
        rpargv[rpargc++] = "-x"; rpargv[rpargc++] = hrbuf;
        sprintf(vrbuf, "%d", vres);
        rpargv[rpargc++] = "-y"; rpargv[rpargc++] = vrbuf;
        rpargv[rpargc++] = "-pa"; rpargv[rpargc++] = "0";
        rpargv[rpargc++] = av[ac-1];
        rpargv[rpargc] = NULL;
                                        /* open output file */
        if ((outfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0666)) >= 0) {
                dolock(outfd, F_WRLCK);
                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) {
                dolock(outfd, F_RDLCK);
                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;
        dolock(outfd, F_UNLCK);
                                        /* 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 *)bmalloc(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;
{
        if (gotalrm)                    /* someone wants us to quit */
                return(0);
        if (syncfp != NULL) {           /* use sync file */
                /*
                 * So we don't necessarily have to lock and unlock the file
                 * multiple times (very slow), we establish an exclusive
                 * lock at the beginning on our synchronization file and
                 * maintain it in the subroutine rvrpiece().
                 */
                sflock(F_WRLCK);
                fseek(syncfp, 0L, 0);           /* read position */
                if (fscanf(syncfp, "%*d %*d %d %d", xp, yp) < 2) {
                        *xp = hmult-1;
                        *yp = vmult;
                }
                if (rvrlim == 0)                /* initialize recovery limit */
                        rvrlim = *xp*vmult + *yp;
                if (rvrpiece(xp, yp)) {         /* do stragglers first */
                        sflock(F_UNLCK);
                        return(1);
                }
                if (--(*yp) < 0) {              /* decrement position */
                        *yp = vmult-1;
                        if (--(*xp) < 0) {      /* all done */
                                sflock(F_UNLCK);
                                return(0);
                        }
                }
                fseek(syncfp, 0L, 0);           /* write new position */
                fprintf(syncfp, "%4d %4d\n%4d %4d\n\n", hmult, vmult, *xp, *yp);
                fflush(syncfp);
                sflock(F_UNLCK);                /* release sync file */
                return(1);
        }
        return(scanf("%d %d", xp, yp) == 2);    /* use stdin */
}


int
rvrpiece(xp, yp)                /* check for recoverable pieces */
register int  *xp, *yp;
{
        static char  *pdone = NULL;     /* which pieces are done */
        static long  readpos = -1;      /* how far we've read */
        register int  i;
        /*
         * This routine is called by nextpiece() with an
         * exclusive lock on syncfp and the file pointer at the
         * appropriate position to read in the finished pieces.
         */
        if (rvrlim < 0)
                return(0);              /* only check if asked */
        if (pdone == NULL)              /* first call */
                pdone = calloc(hmult*vmult, sizeof(char));
        if (readpos != -1)              /* mark what's been done */
                fseek(syncfp, readpos, 0);
        while (fscanf(syncfp, "%d %d", xp, yp) == 2)
                pdone[*xp*vmult+*yp] = 1;
        if (!feof(syncfp)) {
                fprintf(stderr, "%s: format error in sync file\n", progname);
                exit(1);
        }
        readpos = ftell(syncfp);
        i = hmult*vmult;                /* find an unaccounted for piece */
        while (i-- > rvrlim)
                if (!pdone[i]) {
                        *xp = i / vmult;
                        *yp = i % vmult;
                        pdone[i] = 1;   /* consider it done */
                        return(1);
                }
        rvrlim = -1;                    /* nothing left to recover */
        free(pdone);
        pdone = NULL;
        return(0);
}


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

        bfree((char *)pbuf, hres*vres*sizeof(COLR));
        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 */
        }
}


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 */
        guard_io();
        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));
        }
        if (verbose) {                          /* notify caller */
                printf("%d %d begun\n", xpos, ypos);
                fflush(stdout);
        }
        unguard();
                                /* load new piece into buffer */
        for (y = 0; y < vr; y++) {
                guard_io();
                if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
                        fprintf(stderr, "%s: read error from %s\n",
                                        progname, rpargv[0]);
                        exit(cleanup(1));
                }
                unguard();
        }
#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_start = scanorig +
                ((long)(vmult-1-ypos)*vres*hmult+xpos)*hres*sizeof(COLR);
#if NFS
        fls.l_len = ((long)(vres-1)*hmult+1)*hres*sizeof(COLR);
                                /* lock file section so NFS doesn't mess up */
        fls.l_whence = 0;
        fls.l_type = F_WRLCK;
        if (fcntl(outfd, F_SETLKW, &fls) < 0)
                filerr("lock");
#endif
                                /* write new piece to file */
        if (lseek(outfd, fls.l_start, 0) == -1)
                filerr("seek");
        if (hmult == 1) {
                if (writebuf(outfd, (char *)pbuf,
                                vr*hr*sizeof(COLR)) != vr*hr*sizeof(COLR))
                        filerr("write");
        } else
                for (y = 0; y < vr; y++) {
                        if (writebuf(outfd, (char *)(pbuf+y*hr),
                                        hr*sizeof(COLR)) != hr*sizeof(COLR))
                                filerr("write");
                        if (y < vr-1 && lseek(outfd,
                                        (long)(hmult-1)*hr*sizeof(COLR),
                                        1) == -1)
                                filerr("seek");
                }
#if NFS
        fls.l_type = F_UNLCK;           /* release lock */
        if (fcntl(outfd, F_SETLKW, &fls) < 0)
                filerr("lock");
#endif
        if (syncfp != NULL) {                   /* record what's been done */
                sflock(F_WRLCK);
                fseek(syncfp, 0L, 2);           /* append index */
                fprintf(syncfp, "%4d %4d\n", xpos, ypos);
                fflush(syncfp);
                                /*** Unlock not necessary, since
                sflock(F_UNLCK);        _exit() or nextpiece() is next ***/
        }
        if (verbose) {                          /* notify caller */
                printf("%d %d done\n", xpos, ypos);
                fflush(stdout);
        }
        if (pid == -1)          /* didn't fork or fork failed */
                return(0);
        _exit(0);               /* else exit child process (releasing locks) */
}


filerr(t)                       /* report file error and exit */
char  *t;
{
        extern char  *sys_errlist[];

        fprintf(stderr, "%s: %s error on file \"%s\": %s\n",
                        progname, t, outfile, sys_errlist[errno]);
        _exit(1);
}

#endif
Revision:	2.26
Committed:	Sat Aug 7 08:43:32 1993 UTC (31 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.25:	+19 -15 lines
Log Message:	fixed minor bug in nextpiece() and improved error detection and reporting
#	User	Rev	Content
1	greg	2.19	/* Copyright (c) 1993 Regents of the University of California */
2	greg	2.1
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	greg	2.16
13			#ifndef F_SETLKW
14
15			main(argc, argv)
16			int argc;
17			char *argv[];
18			{
19			fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
20			exit(1);
21			}
22
23			#else
24
25	greg	2.6	#include <signal.h>
26	greg	2.1	#include "color.h"
27			#include "view.h"
28			#include "resolu.h"
29
30	greg	2.12	#ifndef NFS
31			#define NFS 1
32			#endif
33	greg	2.9	/* set the following to 0 to forgo forking */
34			#ifndef MAXFORK
35	greg	2.12	#if NFS
36	greg	2.10	#define MAXFORK 3 /* allotment of duped processes */
37	greg	2.12	#else
38			#define MAXFORK 0
39	greg	2.9	#endif
40	greg	2.12	#endif
41	greg	2.18	/* protection from SYSV signals(!) */
42			#if defined(sgi) \|\| defined(hpux)
43			#define guard_io() sighold(SIGALRM)
44			#define unguard() sigrelse(SIGALRM)
45			#endif
46			#ifndef guard_io
47			#define guard_io() 0
48			#define unguard() 0
49			#endif
50	greg	2.1	/* rpict command */
51	greg	2.23	char *rpargv[128] = {"rpict", "-S", "1"};
52			int rpargc = 3;
53	greg	2.1	int rpd[3];
54			FILE torp, fromrp;
55	greg	2.8	COLR *pbuf;
56	greg	2.1	/* our view parameters */
57			VIEW ourview = STDVIEW;
58	greg	2.4	double pixaspect = 1.0;
59	greg	2.23	int hres = 1024, vres = 1024, hmult = 4, vmult = 4;
60	greg	2.1	/* output file */
61			char *outfile = NULL;
62			int outfd;
63			long scanorig;
64	greg	2.25	FILE syncfp = NULL; / synchronization file pointer */
65			int synclst = F_UNLCK; /* synchronization file lock status */
66	greg	2.9	int nforked = 0;
67	greg	2.1
68	greg	2.25	#define sflock(t) if ((t)!=synclst) dolock(fileno(syncfp),synclst=t)
69
70	greg	2.1	char *progname;
71			int verbose = 0;
72	greg	2.25	int rvrlim = -1;
73	greg	2.1
74			extern long lseek(), ftell();
75
76	greg	2.6	int gotalrm = 0;
77			int onalrm() { gotalrm++; }
78	greg	2.1
79	greg	2.6
80	greg	2.1	main(argc, argv)
81			int argc;
82			char *argv[];
83			{
84			register int i, rval;
85
86			progname = argv[0];
87			for (i = 1; i < argc; i++) {
88	greg	2.22	/* expand arguments */
89			while (rval = expandarg(&argc, &argv, i))
90			if (rval < 0) {
91			fprintf(stderr, "%s: cannot expand '%s'",
92			argv[0], argv[i]);
93			exit(1);
94			}
95	greg	2.1	if (argv[i][0] == '-')
96			switch (argv[i][1]) {
97			case 'v':
98			switch (argv[i][2]) {
99			case '\0': /* verbose option */
100			verbose = !verbose;
101			continue;
102			case 'f': /* view file */
103			if (viewfile(argv[++i], &ourview, NULL) <= 0) {
104			fprintf(stderr,
105			"%s: not a view file\n", argv[i]);
106			exit(1);
107			}
108			continue;
109			default: /* view option? */
110			rval = getviewopt(&ourview, argc-i, argv+i);
111			if (rval >= 0) {
112			i += rval;
113			continue;
114			}
115			break;
116			}
117			break;
118			case 'p': /* pixel aspect ratio? */
119	greg	2.23	if (argv[i][2] != 'a' \|\| argv[i][3])
120			break;
121			pixaspect = atof(argv[i+1]);
122			continue;
123			case 'x': /* overall x resolution */
124			if (argv[i][2])
125			break;
126			hres = atoi(argv[++i]);
127			continue;
128			case 'y': /* overall y resolution */
129			if (argv[i][2])
130			break;
131			vres = atoi(argv[++i]);
132			continue;
133	greg	2.1	case 'X': /* horizontal multiplier */
134			if (argv[i][2])
135			break;
136			hmult = atoi(argv[++i]);
137			continue;
138			case 'Y': /* vertical multiplier */
139			if (argv[i][2])
140			break;
141			vmult = atoi(argv[++i]);
142			continue;
143	greg	2.25	case 'R': /* recover */
144			if (argv[i][2])
145			break;
146			rvrlim = 0;
147			/* fall through */
148	greg	2.5	case 'F': /* syncronization file */
149			if (argv[i][2])
150			break;
151	greg	2.25	if ((syncfp = fopen(argv[++i],"r+")) == NULL) {
152	greg	2.5	fprintf(stderr, "%s: cannot open\n",
153			argv[i]);
154			exit(1);
155			}
156			continue;
157	greg	2.15	case 'z': /* z-file ist verbotten */
158			fprintf(stderr, "%s: -z option not allowed\n",
159			argv[0]);
160			exit(1);
161	greg	2.1	case 'o': /* output file */
162			if (argv[i][2])
163			break;
164			outfile = argv[++i];
165			continue;
166	greg	2.23	} else if (i >= argc-1)
167			break;
168	greg	2.1	rpargv[rpargc++] = argv[i];
169			}
170	greg	2.23	if (i >= argc) {
171			fprintf(stderr, "%s: missing octree argument\n", argv[0]);
172			exit(1);
173			}
174	greg	2.1	if (outfile == NULL) {
175			fprintf(stderr, "%s: missing output file\n", argv[0]);
176			exit(1);
177			}
178			init(argc, argv);
179			rpiece();
180	greg	2.15	exit(cleanup(0));
181	greg	2.1	}
182
183
184	greg	2.25	dolock(fd, ltyp) /* lock or unlock a file */
185			int fd;
186			int ltyp;
187			{
188			static struct flock fls; /* static so initialized to zeroes */
189
190			fls.l_type = ltyp;
191			if (fcntl(fd, F_SETLKW, &fls) < 0) {
192			fprintf(stderr, "%s: cannot lock/unlock file\n", progname);
193			exit(1);
194			}
195			}
196
197
198	greg	2.1	init(ac, av) /* set up output file and start rpict */
199			int ac;
200			char **av;
201			{
202	greg	2.23	static char hrbuf[16], vrbuf[16];
203	greg	2.2	extern char VersionID[];
204	greg	2.1	char *err;
205			FILE *fp;
206			int hr, vr;
207			/* set up view */
208			if ((err = setview(&ourview)) != NULL) {
209			fprintf(stderr, "%s: %s\n", progname, err);
210			exit(1);
211			}
212	greg	2.25	if (syncfp != NULL) {
213			sflock(F_RDLCK);
214			fscanf(syncfp, "%d %d", &hmult, &vmult);
215			sflock(F_UNLCK);
216	greg	2.5	}
217	greg	2.23	/* compute piece size */
218			hres /= hmult;
219			vres /= vmult;
220	greg	2.1	normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
221	greg	2.23	sprintf(hrbuf, "%d", hres);
222			rpargv[rpargc++] = "-x"; rpargv[rpargc++] = hrbuf;
223			sprintf(vrbuf, "%d", vres);
224			rpargv[rpargc++] = "-y"; rpargv[rpargc++] = vrbuf;
225			rpargv[rpargc++] = "-pa"; rpargv[rpargc++] = "0";
226			rpargv[rpargc++] = av[ac-1];
227			rpargv[rpargc] = NULL;
228	greg	2.1	/* open output file */
229			if ((outfd = open(outfile, O_WRONLY\|O_CREAT\|O_EXCL, 0666)) >= 0) {
230	greg	2.25	dolock(outfd, F_WRLCK);
231	greg	2.1	if ((fp = fdopen(dup(outfd), "w")) == NULL)
232			goto filerr;
233			printargs(ac, av, fp); /* write header */
234	greg	2.2	fprintf(fp, "SOFTWARE= %s\n", VersionID);
235	greg	2.1	fputs(VIEWSTR, fp);
236			fprintview(&ourview, fp);
237			putc('\n', fp);
238			if (pixaspect < .99 \|\| pixaspect > 1.01)
239			fputaspect(pixaspect, fp);
240			fputformat(COLRFMT, fp);
241			putc('\n', fp);
242			fprtresolu(hreshmult, vresvmult, fp);
243			} else if ((outfd = open(outfile, O_RDWR)) >= 0) {
244	greg	2.25	dolock(outfd, F_RDLCK);
245	greg	2.1	if ((fp = fdopen(dup(outfd), "r+")) == NULL)
246			goto filerr;
247	greg	2.13	getheader(fp, NULL, NULL); /* skip header */
248	greg	2.15	if (!fscnresolu(&hr, &vr, fp) \|\| /* check resolution */
249	greg	2.1	hr != hreshmult \|\| vr != vresvmult) {
250	greg	2.8	fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n",
251			progname, outfile);
252	greg	2.1	exit(1);
253			}
254			} else {
255	greg	2.8	fprintf(stderr, "%s: cannot open file \"%s\"\n",
256			progname, outfile);
257	greg	2.1	exit(1);
258			}
259			scanorig = ftell(fp); /* record position of first scanline */
260			if (fclose(fp) == -1) /* done with stream i/o */
261			goto filerr;
262	greg	2.25	dolock(outfd, F_UNLCK);
263	greg	2.1	/* start rpict process */
264			if (open_process(rpd, rpargv) <= 0) {
265	greg	2.3	fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]);
266	greg	2.1	exit(1);
267			}
268			if ((fromrp = fdopen(rpd[0], "r")) == NULL \|\|
269			(torp = fdopen(rpd[1], "w")) == NULL) {
270			fprintf(stderr, "%s: cannot open stream to %s\n",
271			progname, rpargv[0]);
272			exit(1);
273			}
274	greg	2.23	if ((pbuf = (COLR )bmalloc(hresvres*sizeof(COLR))) == NULL) {
275	greg	2.1	fprintf(stderr, "%s: out of memory\n", progname);
276			exit(1);
277			}
278	greg	2.6	signal(SIGALRM, onalrm);
279	greg	2.1	return;
280			filerr:
281	greg	2.8	fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile);
282	greg	2.1	exit(1);
283			}
284
285
286			int
287	greg	2.5	nextpiece(xp, yp) /* get next piece assignment */
288			int xp, yp;
289			{
290	greg	2.6	if (gotalrm) /* someone wants us to quit */
291			return(0);
292	greg	2.25	if (syncfp != NULL) { /* use sync file */
293			/*
294			* So we don't necessarily have to lock and unlock the file
295			* multiple times (very slow), we establish an exclusive
296			* lock at the beginning on our synchronization file and
297			* maintain it in the subroutine rvrpiece().
298			*/
299			sflock(F_WRLCK);
300			fseek(syncfp, 0L, 0); /* read position */
301			if (fscanf(syncfp, "%d %d %d %d", xp, yp) < 2) {
302	greg	2.8	*xp = hmult-1;
303			*yp = vmult;
304			}
305	greg	2.25	if (rvrlim == 0) /* initialize recovery limit */
306			rvrlim = xpvmult + *yp;
307			if (rvrpiece(xp, yp)) { /* do stragglers first */
308			sflock(F_UNLCK);
309			return(1);
310			}
311	greg	2.8	if (--(yp) < 0) { / decrement position */
312	greg	2.5	*yp = vmult-1;
313	greg	2.25	if (--(xp) < 0) { / all done */
314			sflock(F_UNLCK);
315	greg	2.5	return(0);
316			}
317			}
318	greg	2.25	fseek(syncfp, 0L, 0); /* write new position */
319			fprintf(syncfp, "%4d %4d\n%4d %4d\n\n", hmult, vmult, xp, yp);
320			fflush(syncfp);
321			sflock(F_UNLCK); /* release sync file */
322	greg	2.5	return(1);
323			}
324	greg	2.26	return(scanf("%d %d", xp, yp) == 2); /* use stdin */
325	greg	2.5	}
326
327
328			int
329	greg	2.25	rvrpiece(xp, yp) /* check for recoverable pieces */
330			register int xp, yp;
331			{
332			static char pdone = NULL; / which pieces are done */
333			static long readpos = -1; /* how far we've read */
334			register int i;
335			/*
336			* This routine is called by nextpiece() with an
337			* exclusive lock on syncfp and the file pointer at the
338			* appropriate position to read in the finished pieces.
339			*/
340			if (rvrlim < 0)
341			return(0); /* only check if asked */
342			if (pdone == NULL) /* first call */
343			pdone = calloc(hmult*vmult, sizeof(char));
344			if (readpos != -1) /* mark what's been done */
345			fseek(syncfp, readpos, 0);
346			while (fscanf(syncfp, "%d %d", xp, yp) == 2)
347			pdone[xpvmult+*yp] = 1;
348			if (!feof(syncfp)) {
349			fprintf(stderr, "%s: format error in sync file\n", progname);
350			exit(1);
351			}
352			readpos = ftell(syncfp);
353			i = hmultvmult; / find an unaccounted for piece */
354			while (i-- > rvrlim)
355			if (!pdone[i]) {
356			*xp = i / vmult;
357			*yp = i % vmult;
358			pdone[i] = 1; /* consider it done */
359			return(1);
360			}
361			rvrlim = -1; /* nothing left to recover */
362			free(pdone);
363			pdone = NULL;
364			return(0);
365			}
366
367
368			int
369	greg	2.10	cleanup(rstat) /* close rpict process and clean up */
370			int rstat;
371	greg	2.1	{
372	greg	2.10	int status;
373	greg	2.1
374	greg	2.23	bfree((char )pbuf, hresvres*sizeof(COLR));
375	greg	2.1	fclose(torp);
376			fclose(fromrp);
377	greg	2.10	while (wait(&status) != -1)
378	greg	2.9	if (rstat == 0)
379			rstat = status>>8 & 0xff;
380			return(rstat);
381	greg	2.1	}
382
383
384			rpiece() /* render picture piece by piece */
385			{
386			VIEW pview;
387			int xorg, yorg;
388	greg	2.11	/* compute view parameters */
389			copystruct(&pview, &ourview);
390			switch (ourview.type) {
391			case VT_PER:
392			pview.horiz = 2.180./PIatan(
393			tan(PI/180./2.*ourview.horiz)/hmult );
394			pview.vert = 2.180./PIatan(
395			tan(PI/180./2.*ourview.vert)/vmult );
396			break;
397			case VT_PAR:
398			case VT_ANG:
399			pview.horiz = ourview.horiz / hmult;
400			pview.vert = ourview.vert / vmult;
401			break;
402			case VT_HEM:
403			pview.horiz = 2.180./PIasin(
404			sin(PI/180./2.*ourview.horiz)/hmult );
405			pview.vert = 2.180./PIasin(
406			sin(PI/180./2.*ourview.vert)/vmult );
407			break;
408			default:
409			fprintf(stderr, "%s: unknown view type '-vt%c'\n",
410			progname, ourview.type);
411			exit(cleanup(1));
412			}
413			/* render each piece */
414	greg	2.5	while (nextpiece(&xorg, &yorg)) {
415	greg	2.11	pview.hoff = ourview.hoff + xorg - 0.5*(hmult-1);
416			pview.voff = ourview.voff + yorg - 0.5*(vmult-1);
417	greg	2.1	fputs(VIEWSTR, torp);
418			fprintview(&pview, torp);
419			putc('\n', torp);
420	greg	2.11	fflush(torp); /* assigns piece to rpict */
421	greg	2.1	putpiece(xorg, yorg); /* place piece in output */
422			}
423			}
424
425
426	greg	2.9	int
427	greg	2.1	putpiece(xpos, ypos) /* get next piece from rpict */
428			int xpos, ypos;
429			{
430	greg	2.7	struct flock fls;
431	greg	2.9	int pid, status;
432	greg	2.1	int hr, vr;
433	greg	2.8	register int y;
434			/* check bounds */
435	greg	2.5	if (xpos < 0 \| ypos < 0 \| xpos >= hmult \| ypos >= vmult) {
436			fprintf(stderr, "%s: requested piece (%d,%d) out of range\n",
437			progname, xpos, ypos);
438	greg	2.10	exit(cleanup(1));
439	greg	2.5	}
440	greg	2.8	/* check header from rpict */
441	greg	2.18	guard_io();
442	greg	2.13	getheader(fromrp, NULL, NULL);
443	greg	2.15	if (!fscnresolu(&hr, &vr, fromrp) \|\| hr != hres \| vr != vres) {
444	greg	2.3	fprintf(stderr, "%s: resolution mismatch from %s\n",
445			progname, rpargv[0]);
446	greg	2.10	exit(cleanup(1));
447	greg	2.1	}
448	greg	2.24	if (verbose) { /* notify caller */
449			printf("%d %d begun\n", xpos, ypos);
450			fflush(stdout);
451			}
452	greg	2.18	unguard();
453	greg	2.8	/* load new piece into buffer */
454	greg	2.18	for (y = 0; y < vr; y++) {
455			guard_io();
456	greg	2.8	if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
457	greg	2.3	fprintf(stderr, "%s: read error from %s\n",
458			progname, rpargv[0]);
459	greg	2.10	exit(cleanup(1));
460	greg	2.1	}
461	greg	2.18	unguard();
462			}
463	greg	2.9	#if MAXFORK
464			/* fork so we don't slow rpict down */
465			if ((pid = fork()) > 0) {
466	greg	2.10	if (++nforked >= MAXFORK) {
467	greg	2.9	wait(&status); /* reap a child */
468			if (status)
469	greg	2.10	exit(cleanup(status>>8 & 0xff));
470	greg	2.9	nforked--;
471			}
472			return(pid);
473			}
474			#else
475			pid = -1; /* no forking */
476			#endif
477	greg	2.19	fls.l_start = scanorig +
478			((long)(vmult-1-ypos)vreshmult+xpos)hressizeof(COLR);
479	greg	2.12	#if NFS
480	greg	2.19	fls.l_len = ((long)(vres-1)hmult+1)hres*sizeof(COLR);
481	greg	2.8	/* lock file section so NFS doesn't mess up */
482			fls.l_whence = 0;
483			fls.l_type = F_WRLCK;
484	greg	2.26	if (fcntl(outfd, F_SETLKW, &fls) < 0)
485			filerr("lock");
486	greg	2.12	#endif
487	greg	2.8	/* write new piece to file */
488	greg	2.19	if (lseek(outfd, fls.l_start, 0) == -1)
489	greg	2.26	filerr("seek");
490	greg	2.9	if (hmult == 1) {
491			if (writebuf(outfd, (char *)pbuf,
492			vrhrsizeof(COLR)) != vrhrsizeof(COLR))
493	greg	2.26	filerr("write");
494	greg	2.9	} else
495			for (y = 0; y < vr; y++) {
496			if (writebuf(outfd, (char )(pbuf+yhr),
497			hrsizeof(COLR)) != hrsizeof(COLR))
498	greg	2.26	filerr("write");
499	greg	2.9	if (y < vr-1 && lseek(outfd,
500			(long)(hmult-1)hrsizeof(COLR),
501			1) == -1)
502	greg	2.26	filerr("seek");
503	greg	2.1	}
504	greg	2.25	#if NFS
505			fls.l_type = F_UNLCK; /* release lock */
506	greg	2.26	if (fcntl(outfd, F_SETLKW, &fls) < 0)
507			filerr("lock");
508	greg	2.25	#endif
509			if (syncfp != NULL) { /* record what's been done */
510			sflock(F_WRLCK);
511			fseek(syncfp, 0L, 2); /* append index */
512			fprintf(syncfp, "%4d %4d\n", xpos, ypos);
513			fflush(syncfp);
514			/*** Unlock not necessary, since
515			sflock(F_UNLCK); _exit() or nextpiece() is next ***/
516			}
517	greg	2.20	if (verbose) { /* notify caller */
518			printf("%d %d done\n", xpos, ypos);
519			fflush(stdout);
520			}
521	greg	2.25	if (pid == -1) /* didn't fork or fork failed */
522	greg	2.9	return(0);
523	greg	2.25	_exit(0); /* else exit child process (releasing locks) */
524	greg	2.26	}
525
526
527			filerr(t) /* report file error and exit */
528			char *t;
529			{
530			extern char *sys_errlist[];
531
532			fprintf(stderr, "%s: %s error on file \"%s\": %s\n",
533			progname, t, outfile, sys_errlist[errno]);
534	greg	2.9	_exit(1);
535	greg	2.1	}
536	greg	2.16
537			#endif