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rpict.c

#ifndef lint
static const char RCSid[] = "$Id: rpict.c,v 2.77 2006/04/05 06:22:56 greg Exp $";
#endif
/*
 *  rpict.c - routines and variables for picture generation.
 */

#include "copyright.h"

#include  <sys/types.h>

#ifndef NON_POSIX
#ifdef BSD
#include  <sys/time.h>
#include  <sys/resource.h>
#else
#include  <sys/times.h>
#include  <unistd.h>
#endif
#endif

#include  <time.h>
#include  <signal.h>

#include  "platform.h"
#include  "ray.h"
#include  "paths.h"
#include  "ambient.h"
#include  "view.h"
#include  "random.h"
#include  "paths.h"
#include  "rtmisc.h" /* myhostname() */


#define      RFTEMPLATE "rfXXXXXX"

#ifndef SIGCONT
#ifdef SIGIO     /* XXX can we live without this? */
#define SIGCONT         SIGIO
#endif
#endif

CUBE  thescene;                     /* our scene */
OBJECT      nsceneobjs;             /* number of objects in our scene */

int  dimlist[MAXDIM];               /* sampling dimensions */
int  ndims = 0;                     /* number of sampling dimensions */
int  samplendx;                     /* sample index number */

//extern void  ambnotify();
void  (*addobjnotify[])() = {ambnotify, NULL};

VIEW  ourview = STDVIEW;            /* view parameters */
int  hresolu = 512;                 /* horizontal resolution */
int  vresolu = 512;                 /* vertical resolution */
double      pixaspect = 1.0;        /* pixel aspect ratio */

int  psample = 4;             /* pixel sample size */
double      maxdiff = .05;                /* max. difference for interpolation */
double      dstrpix = 0.67;               /* square pixel distribution */

double  mblur = 0.;                 /* motion blur parameter */

double  dblur = 0.;                 /* depth-of-field blur parameter */

void  (*trace)() = NULL;            /* trace call */

int  do_irrad = 0;                  /* compute irradiance? */

int  rand_samp = 0;                 /* pure Monte Carlo sampling? */

double      dstrsrc = 0.0;                /* square source distribution */
double      shadthresh = .05;       /* shadow threshold */
double      shadcert = .5;                /* shadow certainty */
int  directrelay = 1;               /* number of source relays */
int  vspretest = 512;               /* virtual source pretest density */
int  directvis = 1;                 /* sources visible? */
double      srcsizerat = .25;       /* maximum ratio source size/dist. */

COLOR  cextinction = BLKCOLOR;            /* global extinction coefficient */
COLOR  salbedo = BLKCOLOR;          /* global scattering albedo */
double  seccg = 0.;                 /* global scattering eccentricity */
double  ssampdist = 0.;             /* scatter sampling distance */

double      specthresh = .15;       /* specular sampling threshold */
double      specjitter = 1.;        /* specular sampling jitter */

int  backvis = 1;             /* back face visibility */

int  maxdepth = 7;                  /* maximum recursion depth */
double      minweight = 4e-3;       /* minimum ray weight */

char  *ambfile = NULL;              /* ambient file name */
COLOR  ambval = BLKCOLOR;           /* ambient value */
int  ambvwt = 0;              /* initial weight for ambient value */
double      ambacc = 0.2;                 /* ambient accuracy */
int  ambres = 64;             /* ambient resolution */
int  ambdiv = 512;                  /* ambient divisions */
int  ambssamp = 128;                /* ambient super-samples */
int  ambounce = 0;                  /* ambient bounces */
char  *amblist[AMBLLEN];            /* ambient include/exclude list */
int  ambincl = -1;                  /* include == 1, exclude == 0 */

int  ralrm = 0;                     /* seconds between reports */

double      pctdone = 0.0;                /* percentage done */
time_t  tlastrept = 0L;             /* time at last report */
time_t  tstart;                     /* starting time */

#define      MAXDIV           16          /* maximum sample size */

#define      pixjitter()      (.5+dstrpix*(.5-frandom()))

int  hres, vres;              /* resolution for this frame */

static VIEW lastview;         /* the previous view input */

//extern char  *mktemp();  /* XXX should be in stdlib.h or unistd.h */

//double    pixvalue();

static void report(int);
static int nextview(FILE *fp);
static void render(char *zfile, char *oldfile);
static void fillscanline(COLOR *scanline, float *zline, char *sd, int xres,
            int y, int xstep);
static void fillscanbar(COLOR *scanbar[], float *zbar[], int xres,
            int y, int ysize);
static int fillsample(COLOR *colline, float *zline, int x, int y,
            int xlen, int ylen, int b);
static double pixvalue(COLOR  col, int  x, int  y);
static int salvage(char  *oldfile);
static int pixnumber(int  x, int  y, int  xres, int  yres);



#ifdef RHAS_STAT
#include  <sys/types.h>
#include  <sys/stat.h>
int
file_exists(fname)                        /* ordinary file exists? */
char  *fname;
{
      struct stat  sbuf;
      if (stat(fname, &sbuf) < 0) return(0);
      return((sbuf.st_mode & S_IFREG) != 0);
}
#else
#define  file_exists(f) (access(f,F_OK)==0)
#endif


void
quit(code)              /* quit program */
int  code;
{
      if (code)               /* report status */
            report(0);
#ifndef NON_POSIX
      headclean();                  /* delete header file */
      pfclean();              /* clean up persist files */
#endif
      exit(code);
}


#ifndef NON_POSIX
static void
report(int dummy)       /* report progress */
{
      double  u, s;
#ifdef BSD
      struct rusage  rubuf;
#else
      struct tms  tbuf;
      double  period;
#endif

      tlastrept = time((time_t *)NULL);
#ifdef BSD
      getrusage(RUSAGE_SELF, &rubuf);
      u = rubuf.ru_utime.tv_sec + rubuf.ru_utime.tv_usec/1e6;
      s = rubuf.ru_stime.tv_sec + rubuf.ru_stime.tv_usec/1e6;
      getrusage(RUSAGE_CHILDREN, &rubuf);
      u += rubuf.ru_utime.tv_sec + rubuf.ru_utime.tv_usec/1e6;
      s += rubuf.ru_stime.tv_sec + rubuf.ru_stime.tv_usec/1e6;
#else
      times(&tbuf);
#ifdef _SC_CLK_TCK
      period = 1.0 / sysconf(_SC_CLK_TCK);
#else
      period = 1.0 / 60.0;
#endif
      u = ( tbuf.tms_utime + tbuf.tms_cutime ) * period;
      s = ( tbuf.tms_stime + tbuf.tms_cstime ) * period;
#endif

      sprintf(errmsg,
            "%lu rays, %4.2f%% after %.3fu %.3fs %.3fr hours on %s\n",
                  nrays, pctdone, u/3600., s/3600.,
                  (tlastrept-tstart)/3600., myhostname());
      eputs(errmsg);
#ifdef SIGCONT
      signal(SIGCONT, report);
#endif
}
#else
static void
report(int dummy)       /* report progress */
{
      tlastrept = time((time_t *)NULL);
      sprintf(errmsg, "%lu rays, %4.2f%% after %5.4f hours\n",
                  nrays, pctdone, (tlastrept-tstart)/3600.0);
      eputs(errmsg);
}
#endif


extern void
rpict(                  /* generate image(s) */
      int  seq,
      char  *pout,
      char  *zout,
      char  *prvr
)
/*
 * If seq is greater than zero, then we will render a sequence of
 * images based on view parameter strings read from the standard input.
 * If pout is NULL, then all images will be sent to the standard ouput.
 * If seq is greater than zero and prvr is an integer, then it is the
 * frame number at which rendering should begin.  Preceeding view parameter
 * strings will be skipped in the input.
 * If pout and prvr are the same, prvr is renamed to avoid overwriting.
 * Note that pout and zout should contain %d format specifications for
 * sequenced file naming.
 */
{
      char  fbuf[128], fbuf2[128];
      int  npicts;
      register char  *cp;
      RESOLU      rs;
      double      pa;
                              /* check sampling */
      if (psample < 1)
            psample = 1;
      else if (psample > MAXDIV) {
            sprintf(errmsg, "pixel sampling reduced from %d to %d",
                        psample, MAXDIV);
            error(WARNING, errmsg);
            psample = MAXDIV;
      }
                              /* get starting frame */
      if (seq <= 0)
            seq = 0;
      else if (prvr != NULL && isint(prvr)) {
            register int  rn;       /* skip to specified view */
            if ((rn = atoi(prvr)) < seq)
                  error(USER, "recover frame less than start frame");
            if (pout == NULL)
                  error(USER, "missing output file specification");
            for ( ; seq < rn; seq++)
                  if (nextview(stdin) == EOF)
                        error(USER, "unexpected EOF on view input");
            setview(&ourview);
            prvr = fbuf;                  /* mark for renaming */
      }
      if ((pout != NULL) & (prvr != NULL)) {
            sprintf(fbuf, pout, seq);
            if (!strcmp(prvr, fbuf)) {    /* rename */
                  strcpy(fbuf2, fbuf);
                  for (cp = fbuf2; *cp; cp++)
                        ;
                  while (cp > fbuf2 && !ISDIRSEP(cp[-1]))
                        cp--;
                  strcpy(cp, RFTEMPLATE);
                  prvr = mktemp(fbuf2);
                  if (rename(fbuf, prvr) < 0) {
                        if (errno == ENOENT) {  /* ghost file */
                              sprintf(errmsg,
                                    "new output file \"%s\"",
                                    fbuf);
                              error(WARNING, errmsg);
                              prvr = NULL;
                        } else {          /* serious error */
                              sprintf(errmsg,
                              "cannot rename \"%s\" to \"%s\"",
                                    fbuf, prvr);
                              error(SYSTEM, errmsg);
                        }
                  }
            }
      }
      npicts = 0;             /* render sequence */
      do {
            if (seq && nextview(stdin) == EOF)
                  break;
            pctdone = 0.0;
            if (pout != NULL) {
                  sprintf(fbuf, pout, seq);
                  if (file_exists(fbuf)) {
                        if (prvr != NULL || !strcmp(fbuf, pout)) {
                              sprintf(errmsg,
                                    "output file \"%s\" exists",
                                    fbuf);
                              error(USER, errmsg);
                        }
                        setview(&ourview);
                        continue;         /* don't clobber */
                  }
                  if (freopen(fbuf, "w", stdout) == NULL) {
                        sprintf(errmsg,
                              "cannot open output file \"%s\"", fbuf);
                        error(SYSTEM, errmsg);
                  }
                  SET_FILE_BINARY(stdout);
                  dupheader();
            }
            hres = hresolu; vres = vresolu; pa = pixaspect;
            if (prvr != NULL) {
                  if (viewfile(prvr, &ourview, &rs) <= 0) {
                        sprintf(errmsg,
                  "cannot recover view parameters from \"%s\"", prvr);
                        error(WARNING, errmsg);
                  } else {
                        pa = 0.0;
                        hres = scanlen(&rs);
                        vres = numscans(&rs);
                  }
            }
            if ((cp = setview(&ourview)) != NULL)
                  error(USER, cp);
            normaspect(viewaspect(&ourview), &pa, &hres, &vres);
            if (seq) {
                  if (ralrm > 0) {
                        fprintf(stderr, "FRAME %d:", seq);
                        fprintview(&ourview, stderr);
                        putc('\n', stderr);
                        fflush(stderr);
                  }
                  printf("FRAME=%d\n", seq);
            }
            fputs(VIEWSTR, stdout);
            fprintview(&ourview, stdout);
            putchar('\n');
            if (pa < .99 || pa > 1.01)
                  fputaspect(pa, stdout);
            fputnow(stdout);
            fputformat(COLRFMT, stdout);
            putchar('\n');
            if (zout != NULL)
                  sprintf(cp=fbuf, zout, seq);
            else
                  cp = NULL;
            render(cp, prvr);
            prvr = NULL;
            npicts++;
      } while (seq++);
                              /* check that we did something */
      if (npicts == 0)
            error(WARNING, "no output produced");
}


static int
nextview(                     /* get next view from fp */
      FILE  *fp
)
{
      char  linebuf[256];

      lastview = ourview;
      while (fgets(linebuf, sizeof(linebuf), fp) != NULL)
            if (isview(linebuf) && sscanview(&ourview, linebuf) > 0)
                  return(0);
      return(EOF);
}     


static void
render(                       /* render the scene */
      char  *zfile,
      char  *oldfile
)
{
      COLOR  *scanbar[MAXDIV+1];    /* scanline arrays of pixel values */
      float  *zbar[MAXDIV+1];       /* z values */
      char  *sampdens;        /* previous sample density */
      int  ypos;              /* current scanline */
      int  ystep;             /* current y step size */
      int  hstep;             /* h step size */
      int  zfd;
      COLOR  *colptr;
      float  *zptr;
      register int  i;
                              /* check for empty image */
      if (hres <= 0 || vres <= 0) {
            error(WARNING, "empty output picture");
            fprtresolu(0, 0, stdout);
            return;
      }
                              /* allocate scanlines */
      for (i = 0; i <= psample; i++) {
            scanbar[i] = (COLOR *)malloc(hres*sizeof(COLOR));
            if (scanbar[i] == NULL)
                  goto memerr;
      }
      hstep = (psample*140+49)/99;        /* quincunx sampling */
      ystep = (psample*99+70)/140;
      if (hstep > 2) {
            i = hres/hstep + 2;
            if ((sampdens = (char *)malloc(i)) == NULL)
                  goto memerr;
            while (i--)
                  sampdens[i] = hstep;
      } else
            sampdens = NULL;
                              /* open z-file */
      if (zfile != NULL) {
            if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) {
                  sprintf(errmsg, "cannot open z-file \"%s\"", zfile);
                  error(SYSTEM, errmsg);
            }
            SET_FD_BINARY(zfd);
            for (i = 0; i <= psample; i++) {
                  zbar[i] = (float *)malloc(hres*sizeof(float));
                  if (zbar[i] == NULL)
                        goto memerr;
            }
      } else {
            zfd = -1;
            for (i = 0; i <= psample; i++)
                  zbar[i] = NULL;
      }
                              /* write out boundaries */
      fprtresolu(hres, vres, stdout);
                              /* recover file and compute first */
      i = salvage(oldfile);
      if (i >= vres)
            goto alldone;
      if (zfd != -1 && i > 0 &&
                  lseek(zfd, (off_t)i*hres*sizeof(float), SEEK_SET) < 0)
            error(SYSTEM, "z-file seek error in render");
      pctdone = 100.0*i/vres;
      if (ralrm > 0)                /* report init stats */
            report(0);
#ifdef SIGCONT
      else
      signal(SIGCONT, report);
#endif
      ypos = vres-1 - i;                  /* initialize sampling */
      if (directvis)
            init_drawsources(psample);
      fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep);
                                    /* compute scanlines */
      for (ypos -= ystep; ypos > -ystep; ypos -= ystep) {
                                          /* bottom adjust? */
            if (ypos < 0) {
                  ystep += ypos;
                  ypos = 0;
            }
            colptr = scanbar[ystep];            /* move base to top */
            scanbar[ystep] = scanbar[0];
            scanbar[0] = colptr;
            zptr = zbar[ystep];
            zbar[ystep] = zbar[0];
            zbar[0] = zptr;
                                          /* fill base line */
            fillscanline(scanbar[0], zbar[0], sampdens,
                        hres, ypos, hstep);
                                          /* fill bar */
            fillscanbar(scanbar, zbar, hres, ypos, ystep);
            if (directvis)                      /* add bitty sources */
                  drawsources(scanbar, zbar, 0, hres, ypos, ystep);
                                          /* write it out */
#ifdef SIGCONT
            signal(SIGCONT, SIG_IGN);     /* don't interrupt writes */
#endif
            for (i = ystep; i > 0; i--) {
                  if (zfd != -1 && write(zfd, (char *)zbar[i],
                              hres*sizeof(float))
                              < hres*sizeof(float))
                        goto writerr;
                  if (fwritescan(scanbar[i], hres, stdout) < 0)
                        goto writerr;
            }
            if (fflush(stdout) == EOF)
                  goto writerr;
                                          /* record progress */
            pctdone = 100.0*(vres-1-ypos)/vres;
            if (ralrm > 0 && time((time_t *)NULL) >= tlastrept+ralrm)
                  report(0);
#ifdef SIGCONT
            else
                  signal(SIGCONT, report);
#endif
      }
                                    /* clean up */
#ifdef SIGCONT
      signal(SIGCONT, SIG_IGN);
#endif
      if (zfd != -1 && write(zfd, (char *)zbar[0], hres*sizeof(float))
                        < hres*sizeof(float))
            goto writerr;
      fwritescan(scanbar[0], hres, stdout);
      if (fflush(stdout) == EOF)
            goto writerr;
alldone:
      if (zfd != -1) {
            if (close(zfd) == -1)
                  goto writerr;
            for (i = 0; i <= psample; i++)
                  free((void *)zbar[i]);
      }
      for (i = 0; i <= psample; i++)
            free((void *)scanbar[i]);
      if (sampdens != NULL)
            free(sampdens);
      pctdone = 100.0;
      if (ralrm > 0)
            report(0);
#ifdef SIGCONT
      signal(SIGCONT, SIG_DFL);
#endif
      return;
writerr:
      error(SYSTEM, "write error in render");
memerr:
      error(SYSTEM, "out of memory in render");
}


static void
fillscanline(     /* fill scan at y */
      register COLOR    *scanline,
      register float    *zline,
      register char  *sd,
      int  xres,
      int  y,
      int  xstep
)
{
      static int  nc = 0;           /* number of calls */
      int  bl = xstep, b = xstep;
      double      z;
      register int  i;

      z = pixvalue(scanline[0], 0, y);
      if (zline) zline[0] = z;
                        /* zig-zag start for quincunx pattern */
      for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) {
            if (i >= xres) {
                  xstep += xres-1-i;
                  i = xres-1;
            }
            z = pixvalue(scanline[i], i, y);
            if (zline) zline[i] = z;
            if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1];
            if (i <= xstep)
                  b = fillsample(scanline, zline, 0, y, i, 0, b/2);
            else
                  b = fillsample(scanline+i-xstep,
                              zline ? zline+i-xstep : (float *)NULL,
                              i-xstep, y, xstep, 0, b/2);
            if (sd) *sd++ = nc & 1 ? bl : b;
            bl = b;
      }
      if (sd && nc & 1) *sd = bl;
}


static void
fillscanbar(      /* fill interior */
      register COLOR    *scanbar[],
      register float    *zbar[],
      int  xres,
      int  y,
      int  ysize
)
{
      COLOR  vline[MAXDIV+1];
      float  zline[MAXDIV+1];
      int  b = ysize;
      register int  i, j;

      for (i = 0; i < xres; i++) {
            copycolor(vline[0], scanbar[0][i]);
            copycolor(vline[ysize], scanbar[ysize][i]);
            if (zbar[0]) {
                  zline[0] = zbar[0][i];
                  zline[ysize] = zbar[ysize][i];
            }
            b = fillsample(vline, zbar[0] ? zline : (float *)NULL,
                        i, y, 0, ysize, b/2);

            for (j = 1; j < ysize; j++)
                  copycolor(scanbar[j][i], vline[j]);
            if (zbar[0])
                  for (j = 1; j < ysize; j++)
                        zbar[j][i] = zline[j];
      }
}


static int
fillsample( /* fill interior points */
      register COLOR    *colline,
      register float    *zline,
      int  x,
      int  y,
      int  xlen,
      int  ylen,
      int  b
)
{
      double      ratio;
      double      z;
      COLOR  ctmp;
      int  ncut;
      register int  len;

      if (xlen > 0)                 /* x or y length is zero */
            len = xlen;
      else
            len = ylen;

      if (len <= 1)                 /* limit recursion */
            return(0);

      if (b > 0 ||
      (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len]))
                  || bigdiff(colline[0], colline[len], maxdiff)) {

            z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1));
            if (zline) zline[len>>1] = z;
            ncut = 1;
      } else {                            /* interpolate */
            copycolor(colline[len>>1], colline[len]);
            ratio = (double)(len>>1) / len;
            scalecolor(colline[len>>1], ratio);
            if (zline) zline[len>>1] = zline[len] * ratio;
            ratio = 1.0 - ratio;
            copycolor(ctmp, colline[0]);
            scalecolor(ctmp, ratio);
            addcolor(colline[len>>1], ctmp);
            if (zline) zline[len>>1] += zline[0] * ratio;
            ncut = 0;
      }
                                          /* recurse */
      ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2);

      ncut += fillsample(colline+(len>>1),
                  zline ? zline+(len>>1) : (float *)NULL,
                  x+(xlen>>1), y+(ylen>>1),
                  xlen-(xlen>>1), ylen-(ylen>>1), b/2);

      return(ncut);
}


static double
pixvalue(         /* compute pixel value */
      COLOR  col,             /* returned color */
      int  x,                 /* pixel position */
      int  y
)
{
      RAY  thisray;
      FVECT lorg, ldir;
      double      hpos, vpos, vdist, lmax;
      register int      i;
                                    /* compute view ray */
      hpos = (x+pixjitter())/hres;
      vpos = (y+pixjitter())/vres;
      if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
                              &ourview, hpos, vpos)) < -FTINY) {
            setcolor(col, 0.0, 0.0, 0.0);
            return(0.0);
      }
      vdist = ourview.vdist;
                                    /* set pixel index */
      samplendx = pixnumber(x,y,hres,vres);
                                    /* optional motion blur */
      if (lastview.type && mblur > FTINY && (lmax = viewray(lorg, ldir,
                              &lastview, hpos, vpos)) >= -FTINY) {
            register double  d = mblur*(.5-urand(281+samplendx));

            thisray.rmax = (1.-d)*thisray.rmax + d*lmax;
            for (i = 3; i--; ) {
                  thisray.rorg[i] = (1.-d)*thisray.rorg[i] + d*lorg[i];
                  thisray.rdir[i] = (1.-d)*thisray.rdir[i] + d*ldir[i];
            }
            if (normalize(thisray.rdir) == 0.0)
                  return(0.0);
            vdist = (1.-d)*vdist + d*lastview.vdist;
      }
                                    /* optional depth-of-field */
      if (dblur > FTINY && vdist > FTINY) {
            double  vc, dfh, dfv;
                                    /* PI/4. square/circle conv. */
            dfh = PI/4.*dblur*(.5 - frandom());
            dfv = PI/4.*dblur*(.5 - frandom());
            if (ourview.type == VT_PER || ourview.type == VT_PAR) {
                  dfh /= sqrt(ourview.hn2);
                  dfv /= sqrt(ourview.vn2);
                  for (i = 3; i--; ) {
                        vc = thisray.rorg[i] + vdist*thisray.rdir[i];
                        thisray.rorg[i] += dfh*ourview.hvec[i] +
                                          dfv*ourview.vvec[i] ;
                        thisray.rdir[i] = vc - thisray.rorg[i];
                  }
            } else {                /* non-standard view case */
                  double      dfd = PI/4.*dblur*(.5 - frandom());
                  if (ourview.type != VT_ANG) {
                        if (ourview.type != VT_CYL)
                              dfh /= sqrt(ourview.hn2);
                        dfv /= sqrt(ourview.vn2);
                  }
                  for (i = 3; i--; ) {
                        vc = thisray.rorg[i] + vdist*thisray.rdir[i];
                        thisray.rorg[i] += dfh*ourview.hvec[i] +
                                          dfv*ourview.vvec[i] +
                                          dfd*ourview.vdir[i] ;
                        thisray.rdir[i] = vc - thisray.rorg[i];
                  }
            }
            if (normalize(thisray.rdir) == 0.0)
                  return(0.0);
      }

      rayorigin(&thisray, PRIMARY, NULL, NULL);

      rayvalue(&thisray);                 /* trace ray */

      copycolor(col, thisray.rcol);       /* return color */

      return(thisray.rt);                 /* return distance */
}


static int
salvage(          /* salvage scanlines from killed program */
      char  *oldfile
)
{
      COLR  *scanline;
      FILE  *fp;
      int  x, y;

      if (oldfile == NULL)
            goto gotzip;

      if ((fp = fopen(oldfile, "r")) == NULL) {
            sprintf(errmsg, "cannot open recover file \"%s\"", oldfile);
            error(WARNING, errmsg);
            goto gotzip;
      }
      SET_FILE_BINARY(fp);
                        /* discard header */
      getheader(fp, NULL, NULL);
                        /* get picture size */
      if (!fscnresolu(&x, &y, fp)) {
            sprintf(errmsg, "bad recover file \"%s\" - not removed",
                        oldfile);
            error(WARNING, errmsg);
            fclose(fp);
            goto gotzip;
      }

      if (x != hres || y != vres) {
            sprintf(errmsg, "resolution mismatch in recover file \"%s\"",
                        oldfile);
            error(USER, errmsg);
      }

      scanline = (COLR *)malloc(hres*sizeof(COLR));
      if (scanline == NULL)
            error(SYSTEM, "out of memory in salvage");
      for (y = 0; y < vres; y++) {
            if (freadcolrs(scanline, hres, fp) < 0)
                  break;
            if (fwritecolrs(scanline, hres, stdout) < 0)
                  goto writerr;
      }
      if (fflush(stdout) == EOF)
            goto writerr;
      free((void *)scanline);
      fclose(fp);
      unlink(oldfile);
      return(y);
gotzip:
      if (fflush(stdout) == EOF)
            error(SYSTEM, "error writing picture header");
      return(0);
writerr:
      sprintf(errmsg, "write error during recovery of \"%s\"", oldfile);
      error(SYSTEM, errmsg);
      return -1; /* pro forma return */
}

static int
pixnumber(        /* compute pixel index (brushed) */
      register int  x,
      register int  y,
      int  xres,
      int  yres
)
{
      x -= y;
      while (x < 0)
            x += xres;
      return((((x>>2)*yres + y) << 2) + (x & 3));
}

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