From: Kevin M. Rosenberg <kevin@rosenberg.net>
Date: Wed, 7 Jun 2000 07:55:30 +0000 (+0000)
Subject: r86: Initial import
X-Git-Tag: debian-4.5.3-3~931
X-Git-Url: http://git.kpe.io/?p=ctsim.git;a=commitdiff_plain;h=c7b8cd29c1e15bd5a95bff829772da2af1989fe5

r86: Initial import
---

diff --git a/src/if2img.cpp b/src/if2img.cpp
new file mode 100644
index 0000000..1132e73
--- /dev/null
+++ b/src/if2img.cpp
@@ -0,0 +1,734 @@
+/*****************************************************************************
+**  This is part of the CTSim program
+**  Copyright (C) 1983-2000 Kevin Rosenberg
+**
+**  $Id: if2img.cpp,v 1.1 2000/06/07 07:55:30 kevin Exp $
+**  $Log: if2img.cpp,v $
+**  Revision 1.1  2000/06/07 07:55:30  kevin
+**  Initial import
+**
+**  Revision 1.1  2000/06/07 02:29:05  kevin
+**  Initial C++ versions
+**
+**  Revision 1.6  2000/06/03 07:57:51  kevin
+**  Fixed PNG 16-bit format
+**
+**  Revision 1.5  2000/06/03 06:29:57  kevin
+**  *** empty log message ***
+**
+**  Revision 1.4  2000/05/24 22:50:04  kevin
+**  Added support for new SGP library
+**
+**  Revision 1.3  2000/05/16 04:33:59  kevin
+**  Improved option processing
+**
+**  Revision 1.2  2000/05/08 20:02:32  kevin
+**  ANSI C changes
+**
+**  Revision 1.1.1.1  2000/04/28 13:02:44  kevin
+**  Initial CVS import for first public release
+**
+**
+**
+**  This program is free software; you can redistribute it and/or modify
+**  it under the terms of the GNU General Public License (version 2) as
+**  published by the Free Software Foundation.
+**
+**  This program is distributed in the hope that it will be useful,
+**  but WITHOUT ANY WARRANTY; without even the implied warranty of
+**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+**  GNU General Public License for more details.
+**
+**  You should have received a copy of the GNU General Public License
+**  along with this program; if not, write to the Free Software
+**  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+******************************************************************************/
+
+/* FILE
+ *   if2img.c		Convert an SDF file to a viewable format image
+ */
+
+#include "ct.h"
+
+#if HAVE_PNG
+void sdf2d_to_png (ImageFile& im, char *outfile, int bitdepth, int nxcell, int nycell, double densmin, double densmax);
+#endif
+#if HAVE_GIF
+void sdf2d_to_gif (ImageFile& im, char *outfile, int nxcell, int nycell, double densmin, double densmax);
+#endif
+void sdf2d_to_pgm (ImageFile& im, char *outfile, int nxcell, int nycell, double densmin, double densmax);
+void sdf2d_to_pgmasc (ImageFile& im, char *outfile, int nxcell, int nycell, double densmin, double densmax);
+
+enum { O_SCALE, O_MIN, O_MAX, O_AUTO, O_CENTER, O_STATS, O_FORMAT, O_LABELS, 
+       O_HELP, O_VERBOSE, O_VERSION, O_DEBUG };
+
+static struct option my_options[] =
+{
+  {"scale", 1, 0, O_SCALE},
+  {"min", 1, 0, O_MIN},
+  {"max", 1, 0, O_MAX},
+  {"auto", 1, 0, O_AUTO},
+  {"center", 1, 0, O_CENTER},
+  {"format", 1, 0, O_FORMAT},
+  {"labels", 0, 0, O_LABELS},
+  {"stats", 0, 0, O_STATS},
+  {"verbose", 0, 0, O_VERBOSE},
+  {"debug", 0, 0, O_DEBUG},
+  {"help", 0, 0, O_HELP},
+  {"version", 0, 0, O_VERSION},
+  {0, 0, 0, 0}
+};
+
+enum { O_AUTO_FULL, O_AUTO_STD0_1, O_AUTO_STD0_5, O_AUTO_STD1, O_AUTO_STD2, O_AUTO_STD3 };
+#define O_AUTO_FULL_STR  "full"
+#define O_AUTO_STD0_1_STR  "std0.1"
+#define O_AUTO_STD0_5_STR  "std0.5"
+#define O_AUTO_STD1_STR  "std1"
+#define O_AUTO_STD2_STR  "std2"
+#define O_AUTO_STD3_STR  "std3"
+
+enum { O_CENTER_MEAN, O_CENTER_MODE };
+#define O_CENTER_MEAN_STR  "mean"
+#define O_CENTER_MODE_STR  "mode"
+
+enum { O_FORMAT_GIF, O_FORMAT_PNG, O_FORMAT_PNG16, O_FORMAT_PGM, O_FORMAT_PGMASC, O_FORMAT_DISP };
+#define O_FORMAT_GIF_STR   "gif"
+#define O_FORMAT_PNG_STR   "png" 
+#define O_FORMAT_PNG16_STR   "png16" 
+#define O_FORMAT_PGM_STR   "pgm"
+#define O_FORMAT_PGMASC_STR "pgmasc"
+#define O_FORMAT_DISP_STR    "disp"
+
+void 
+if2img_usage (const char *program)
+{
+  fprintf(stdout, "usage: %s sdfname outfile [OPTIONS]\n", kbasename(program));
+  fprintf(stdout, "Convert IF file to an image file\n");
+  fprintf(stdout, "\n");
+  fprintf(stdout, "     sdfname    Name of input SDF file\n");
+  fprintf(stdout, "     outfile    Name of output file\n");
+  fprintf(stdout, "     --format   Output format\n");
+  fprintf(stdout, "         pgm    PGM (portable graymap) format (default)\n");
+  fprintf(stdout, "         pgmasc PGM (portable graymap) ASCII format\n");
+#ifdef HAVE_PNG
+  fprintf(stdout, "         png    PNG (8-bit) format\n");
+  fprintf(stdout, "         png16  PNG (16-bit) format\n");
+#endif
+#ifdef HAVE_GIF
+  fprintf(stdout, "         gif    GIF format\n");
+#endif
+  fprintf(stdout, "         disp   Display on screen\n");
+  fprintf(stdout, "     --center   Center of window\n");
+  fprintf(stdout, "         mode   Mode is center of window (default)\n");
+  fprintf(stdout, "         mean   Mean is center of window\n");
+  fprintf(stdout, "     --auto     Set auto window\n");
+  fprintf(stdout, "         full   Use full window (default)\n");
+  fprintf(stdout, "         std0.1 Use 0.1 standard deviation about center\n");
+  fprintf(stdout, "         std0.5 Use 0.5 standard deviation about center\n");
+  fprintf(stdout, "         std1   Use one standard deviation about center\n");
+  fprintf(stdout, "         std2   Use two standard deviations about center\n");
+  fprintf(stdout, "         std3   Use three standard deviations about center\n");
+  fprintf(stdout, "     --scale    Scaling factor for output size\n");
+  fprintf(stdout, "     --min      Set minimum intensity\n");
+  fprintf(stdout, "     --max      Set maximum intensity\n");
+  fprintf(stdout, "     --stats    Print image statistics\n");
+  fprintf(stdout, "     --labels   Print image labels\n");
+  fprintf(stdout, "     --debug    Set debug mode\n");
+  fprintf(stdout, "     --verbose  Set verbose mode\n");
+  fprintf(stdout, "     --version  Print version\n");
+  fprintf(stdout, "     --help     Print this help message\n");
+}
+
+
+int 
+if2img_main (int argc, char *const argv[])
+{
+  ImageFile* pim = NULL;
+
+  double densmin = HUGE_VAL, densmax = -HUGE_VAL;
+  char *in_file, *out_file;
+  int opt_verbose = 0;
+  int opt_scale = 1;
+  int opt_auto = O_AUTO_FULL;
+  int opt_set_max = 0;
+  int opt_set_min = 0;
+  int opt_stats = 0;
+  int opt_debug = 0;
+  int opt_center = O_CENTER_MODE;
+  int opt_format = O_FORMAT_PGM;
+  int opt_labels = 0;
+
+  while (1)
+    {
+      int c = getopt_long (argc, argv, "", my_options, NULL);
+      char *endptr = NULL;
+      char *endstr;
+      
+      if (c == -1)
+	break;
+      
+      switch (c)
+	{
+	case O_MIN:
+	  opt_set_min = 1;
+	  densmin = strtod(optarg, &endptr);
+	  endstr = optarg + strlen(optarg);
+	  if (endptr != endstr)
+	    {
+	      fprintf(stderr, "Error setting --min to %s\n", optarg);
+	      if2img_usage(argv[0]);
+	      return (1);
+	    }
+	  break;
+	case O_MAX:
+	  opt_set_max = 1;
+	  densmax = strtod(optarg, &endptr);
+	  endstr = optarg + strlen(optarg);
+	  if (endptr != endstr)
+	    {
+	      fprintf(stderr, "Error setting --max to %s\n", optarg);
+	      if2img_usage(argv[0]);
+	      return (1);
+	    }
+	  break;
+	case O_SCALE:
+	  opt_scale = strtol(optarg, &endptr, 10);
+	  endstr = optarg + strlen(optarg);
+	  if (endptr != endstr)
+	    {
+	      fprintf(stderr,"Error setting --scale to %s\n", optarg);
+	      if2img_usage(argv[0]);
+	      return (1);
+	    }
+	  break;
+	case O_AUTO:
+	  if (strcmp(optarg, O_AUTO_FULL_STR) == 0)
+	    opt_auto = O_AUTO_FULL;
+	  else if (strcmp(optarg, O_AUTO_STD1_STR) == 0)
+	    opt_auto = O_AUTO_STD1;
+	  else if (strcmp(optarg, O_AUTO_STD0_5_STR) == 0)
+	    opt_auto = O_AUTO_STD0_5;
+	  else if (strcmp(optarg, O_AUTO_STD0_1_STR) == 0)
+	    opt_auto = O_AUTO_STD0_1;
+	  else if (strcmp(optarg, O_AUTO_STD2_STR) == 0)
+	    opt_auto = O_AUTO_STD2;
+	  else if (strcmp(optarg, O_AUTO_STD3_STR) == 0)
+	    opt_auto = O_AUTO_STD3;
+	  else
+	    {
+	      fprintf(stderr, "Invalid auto mode %s\n", optarg);
+	      if2img_usage(argv[0]);
+	      return (1);
+	    }
+		break;
+	case O_CENTER:
+	  if (strcmp(optarg, O_CENTER_MEAN_STR) == 0)
+	    opt_center = O_CENTER_MEAN;
+	  else if (strcmp(optarg, O_CENTER_MODE_STR) == 0)
+	    opt_center = O_CENTER_MODE;
+	  else
+	    {
+	      fprintf(stderr, "Invalid center mode %s\n", optarg);
+	      if2img_usage(argv[0]);
+	      return (1);
+	    }
+		break;
+	case O_FORMAT:
+	  if (strcmp(optarg, O_FORMAT_PGM_STR) == 0)
+	    opt_format = O_FORMAT_PGM;
+	  else if (strcmp(optarg, O_FORMAT_PGMASC_STR) == 0)
+	    opt_format = O_FORMAT_PGMASC;
+#if HAVE_PNG
+	  else if (strcmp(optarg, O_FORMAT_PNG_STR) == 0)
+	    opt_format = O_FORMAT_PNG;
+	  else if (strcmp(optarg, O_FORMAT_PNG16_STR) == 0)
+	    opt_format = O_FORMAT_PNG16;
+#endif
+#if HAVE_GIF
+	  else if (strcmp(optarg, O_FORMAT_GIF_STR) == 0)
+	    opt_format = O_FORMAT_GIF;
+#endif
+	  else if (strcmp(optarg, O_FORMAT_DISP_STR) == 0)
+	    opt_format = O_FORMAT_DISP;
+	  else {
+	      fprintf(stderr, "Invalid format mode %s\n", optarg);
+	      if2img_usage(argv[0]);
+	      return (1);
+	    }
+	  break;
+	case O_LABELS:
+	  opt_labels = 1;
+	  break;
+	case O_VERBOSE:
+	  opt_verbose = 1;
+	  break;
+	case O_DEBUG:
+	  opt_debug = 1;
+	  break;
+	case O_STATS:
+	  opt_stats = 1;
+	  break;
+        case O_VERSION:
+#ifdef VERSION
+	  fprintf(stdout, "Version %s\n", VERSION);
+#else
+	  fprintf(stderr, "Unknown version number");
+#endif
+	  exit(0);
+	case O_HELP:
+	case '?':
+	  if2img_usage(argv[0]);
+	  return (0);
+	default:
+	  if2img_usage(argv[0]);
+	  return (1);
+	}
+    }
+
+  if ((opt_format == O_FORMAT_DISP && optind + 1 != argc) 
+      || (opt_format != O_FORMAT_DISP && optind + 2 != argc))
+    {
+	if2img_usage(argv[0]);
+	return (1);
+    }
+  
+  in_file = argv[optind];
+
+  if (opt_format != O_FORMAT_DISP)
+      out_file = argv[optind+1];
+  else out_file = NULL;
+
+  pim = new ImageFile (in_file);
+  ImageFile& im = *pim;
+  if (! im.adf.fileRead()) {
+    fprintf(stderr, "File %s does not exist\n", in_file);
+    return (1);
+  }
+
+  if (opt_labels) {
+    int nlabels = im.adf.getNumLabels();
+
+    for (int i = 0; i < nlabels; i++) {
+      Array2dFileLabel label;
+      im.adf.labelRead (label, i);
+      string str;
+      label.getDateString (str);
+
+      if (label.getLabelType() == Array2dFileLabel::L_HISTORY) {
+	cout << "History: " << label.getLabelString() << endl;
+	cout << "  calc time = " << label.getCalcTime() << " secs" << endl;
+	cout << "  Timestamp = " << str << endl;
+      } else if (label.getLabelType() == Array2dFileLabel::L_USER) {
+	cout << "Note: " <<  label.getLabelString() << endl;
+	cout << "  Timestamp = %s" << str << endl;
+      }
+    }
+  }
+
+  if (opt_stats || (! (opt_set_max && opt_set_min))) {
+    double minfound = HUGE_VAL, maxfound = -HUGE_VAL;
+    double mode = 0, mean = 0, stddev = 0, window = 0;
+    double spread;
+    int hist[256];
+    int ibin, nbin = 256;
+    int max_bin, max_binindex; 
+    double maxbin;
+    int nx = im.nx();
+    int ny = im.ny();
+    ImageFileArray v = im.getArray();
+    
+    maxbin = nbin - 1;
+    for (int ix = 0; ix < nx; ix++) {
+      for (int iy = 0; iy < ny; iy++) {
+	if (v[ix][iy] > maxfound)
+	  maxfound = v[ix][iy];
+	if (v[ix][iy] < minfound)
+	  minfound = v[ix][iy];
+	mean += v[ix][iy];
+      }
+    }
+    spread = maxfound - minfound;
+    if (spread == 0)
+      mode = minfound;
+    else {
+      for (ibin = 0; ibin < nbin; ibin++)
+	hist[ibin] = 0;
+      for (int ix = 0; ix < nx; ix++) {
+	for (int iy = 0; iy < ny; iy++) {
+	  int b = (int) ((((v[ix][iy] - minfound) / spread) * (double) maxbin) + 0.5);
+	  hist[b]++;
+	}
+      }
+      max_binindex = 0;
+      max_bin = -1;
+      for (ibin = 0; ibin < nbin; ibin++) {
+	if (hist[ibin] > max_bin) {
+	  max_bin = hist[ibin];
+	  max_binindex = ibin;
+	}
+      }
+      mode = (((double) max_binindex) * spread / ((double) maxbin)) + minfound;
+    }
+    
+    if (opt_auto == O_AUTO_FULL) {
+	if (! opt_set_max)
+	  densmax = maxfound;
+	if (! opt_set_min)
+	  densmin = minfound;
+    }
+    if (opt_stats || opt_auto != O_AUTO_FULL) {
+      mean /= nx * ny;
+      for (int ix = 0; ix < nx; ix++) {
+	for (int iy = 0; iy < ny; iy++) {
+	    double diff = (v[ix][iy] - mean);
+	    stddev += diff * diff;
+	}
+      }
+      stddev = sqrt(stddev / (nx * ny));
+      if (opt_auto == O_AUTO_FULL)
+	;
+      else if (opt_auto == O_AUTO_STD1)
+	    window = stddev;
+      else if (opt_auto == O_AUTO_STD0_1)
+	window = stddev * 0.1;
+      else if (opt_auto == O_AUTO_STD0_5)
+	window = stddev * 0.5;
+	  else if (opt_auto == O_AUTO_STD2)
+	    window = stddev * 2;
+      else if (opt_auto == O_AUTO_STD3)
+	window = stddev * 3;
+      else {
+	fprintf(stderr, "Internal Error: Invalid auto mode %d\n", opt_auto);
+	return (1);
+      }
+    }
+    if (opt_stats) {
+      fprintf(stdout,"nx=%d\n", nx);
+      fprintf(stdout,"ny=%d\n", ny);
+      fprintf(stdout,"min=%f\n", minfound);
+      fprintf(stdout,"max=%f\n", maxfound);
+      fprintf(stdout,"mean=%f\n", mean);
+      fprintf(stdout,"mode=%f\n", mode);
+      fprintf(stdout,"stddev=%f\n", stddev);
+    }
+    if (opt_auto != O_AUTO_FULL) {
+      double center;
+      
+      if (opt_center == O_CENTER_MODE)
+	center = mode;
+      else if (opt_center == O_CENTER_MEAN)
+	center = mean;
+      else {
+	fprintf(stderr, "Internal Error: Invalid center mode %d\n", opt_center);
+	return (1);
+      }
+      if (! opt_set_max)
+	densmax = center + window;
+      if (! opt_set_min)
+	densmin = center - window;
+      }
+  }
+  
+  if (opt_stats) {
+    fprintf(stdout,"min_disp=%f\n", densmin);
+    fprintf(stdout,"max_disp=%f\n", densmax);
+  }
+  
+  if (opt_format == O_FORMAT_PGM)
+    sdf2d_to_pgm (im, out_file, opt_scale, opt_scale, densmin, densmax);
+  else if (opt_format == O_FORMAT_PGMASC)
+    sdf2d_to_pgmasc (im, out_file, opt_scale, opt_scale, densmin, densmax);
+#if HAVE_PNG
+  else if (opt_format == O_FORMAT_PNG)
+    sdf2d_to_png (im, out_file, 8, opt_scale, opt_scale, densmin, densmax);
+  else if (opt_format == O_FORMAT_PNG16)
+    sdf2d_to_png (im, out_file, 16, opt_scale, opt_scale, densmin, densmax);
+#endif
+#if HAVE_GIF
+  else if (opt_format == O_FORMAT_GIF) 
+    sdf2d_to_gif (im, out_file, opt_scale, opt_scale, densmin, densmax);
+#endif
+  else if (opt_format == O_FORMAT_DISP) {
+#if HAVE_SGP
+    // image_display_scale (im, opt_scale, densmin, densmax);
+    //  cio_kb_getc();
+      sgp2_close(sgp2_get_active_win());
+#endif
+  }
+  else
+    {
+      fprintf(stderr, "Internal Error: Invalid format mode %d\n", opt_format);
+      return (1);
+    }
+  return (0);
+}
+
+
+void 
+sdf2d_to_pgm (ImageFile& im, char *outfile, int nxcell, int nycell, double densmin, double densmax)
+{
+  FILE *fp;
+  int irow;
+  unsigned char *rowp;
+  int nx = im.nx();
+  int ny = im.ny();
+  ImageFileArray v = im.getArray();
+
+  rowp = (unsigned char *) sys_alloc(nx * nxcell,"sdf2d_to_img");
+  if (rowp == NULL)
+    return;
+
+  if ((fp = fopen (outfile, "wb")) == NULL)
+     return;
+
+  fprintf(fp, "P5\n");
+  fprintf(fp, "%d %d\n", nx, ny);
+  fprintf(fp, "255\n");
+
+  for (irow = ny - 1; irow >= 0; irow--)
+    {
+      int icol, ir;
+
+      for (icol = 0; icol < nx; icol++)
+	{
+	  double dens;
+	  int p;
+	  int pos = icol * nxcell;
+	  dens = (v[icol][irow] - densmin) / (densmax - densmin);
+	  if (dens < 0)
+	    dens = 0;
+	  else if (dens > 1)
+	    dens = 1;
+	  for (p = pos; p < pos + nxcell; p++)
+	    {
+	      rowp[p] = (unsigned int) (dens * 255.);
+	    }
+	}
+      for (ir = 0; ir < nycell; ir++)
+	{
+	  int ic;
+	  for (ic = 0; ic < nx * nxcell; ic++) 
+	    fprintf(fp, "%c ", rowp[ic]);
+	}
+    }
+  sys_free(rowp, "if2img");
+
+  fclose(fp);
+}
+
+void 
+sdf2d_to_pgmasc (ImageFile& im, char *outfile, int nxcell, int nycell, double densmin, double densmax)
+{
+  FILE *fp;
+  int irow;
+  unsigned char *rowp;
+  int nx = im.nx();
+  int ny = im.ny();
+  ImageFileArray v = im.getArray();
+
+  rowp = (unsigned char *) sys_alloc(nx * nxcell,"sdf2d_to_img");
+  if (rowp == NULL)
+    return;
+
+  if ((fp = fopen (outfile, "wb")) == NULL)
+     return;
+
+  fprintf(fp, "P2\n");
+  fprintf(fp, "%d %d\n", nx, ny);
+  fprintf(fp, "255\n");
+
+  for (irow = ny - 1; irow >= 0; irow--)
+    {
+      int icol, ir;
+
+      for (icol = 0; icol < nx; icol++)
+	{
+	  double dens;
+	  int p;
+	  int pos = icol * nxcell;
+	  dens = (v[icol][irow] - densmin) / (densmax - densmin);
+	  if (dens < 0)
+	    dens = 0;
+	  else if (dens > 1)
+	    dens = 1;
+	  for (p = pos; p < pos + nxcell; p++)
+	    {
+	      rowp[p] = (unsigned int) (dens * 255.);
+	    }
+	}
+      for (ir = 0; ir < nycell; ir++)
+	{
+	  int ic;
+	  for (ic = 0; ic < nx * nxcell; ic++) 
+	    fprintf(fp, "%d ", rowp[ic]);
+	  fprintf(fp, "\n");
+	}
+    }
+  sys_free(rowp, "if2img");
+
+  fclose(fp);
+}
+
+
+#ifdef HAVE_PNG
+void 
+sdf2d_to_png (ImageFile& im, char *outfile, int bitdepth, int nxcell, int nycell, double densmin, double densmax)
+{
+  FILE *fp;
+  png_structp png_ptr;
+  png_infop info_ptr;
+  int irow;
+  unsigned char *rowp;
+  double max_out_level = (1 << bitdepth) - 1;
+  int nx = im.nx();
+  int ny = im.ny();
+  ImageFileArray v = im.getArray();
+
+  rowp = (unsigned char *) sys_alloc(nx * nxcell * (bitdepth / 8),"sdf2d_to_img");
+  if (rowp == NULL)
+    return;
+
+  if ((fp = fopen (outfile, "wb")) == NULL)
+     return;
+
+  png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+  if (! png_ptr)
+    return;
+
+  info_ptr = png_create_info_struct(png_ptr);
+  if (! info_ptr)
+    {
+      png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
+      fclose(fp);
+      return;
+    }
+
+  if (setjmp(png_ptr->jmpbuf))
+    {
+      png_destroy_write_struct(&png_ptr, &info_ptr);
+      fclose(fp);
+      return;
+    }
+
+  png_init_io(png_ptr, fp);
+
+  png_set_IHDR(png_ptr, info_ptr, nx * nxcell, ny * nycell, bitdepth, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_DEFAULT);
+
+  png_write_info(png_ptr, info_ptr);
+  for (irow = ny - 1; irow >= 0; irow--)
+    {
+      png_bytep row_pointer = rowp;
+      int icol, ir;
+
+      for (icol = 0; icol < nx; icol++)
+	{
+	  double dens;
+	  int p;
+          unsigned int outval;
+	  int pos = icol * nxcell;
+	  dens = (v[icol][irow] - densmin) / (densmax - densmin);
+	  if (dens < 0)
+	    dens = 0;
+	  else if (dens > 1)
+	    dens = 1;
+          outval = (unsigned int) (dens * max_out_level);
+	  for (p = pos; p < pos + nxcell; p++)
+                {
+		if (bitdepth == 8)
+                    rowp[p] = outval;
+		else {
+                    int rowpos = p * 2;
+		    rowp[rowpos] = (outval >> 8) & 0xFF;
+		    rowp[rowpos+1] = (outval & 0xFF);
+		}
+	    }
+	}
+      for (ir = 0; ir < nycell; ir++)
+	{
+	  png_write_rows (png_ptr, &row_pointer, 1);
+	}
+    }
+  sys_free(rowp, "if2img");
+
+  png_write_end(png_ptr, info_ptr);
+  png_destroy_write_struct(&png_ptr, &info_ptr);
+
+  fclose(fp);
+}
+#endif
+
+#ifdef HAVE_GD
+#include "gd.h"
+#define N_GRAYSCALE 256
+#endif
+
+void
+sdf2d_to_gif (ImageFile& im, char *outfile, int nxcell, int nycell, double densmin, double densmax)
+{
+#ifdef HAVE_GD
+  gdImagePtr gif;
+  FILE *out;
+  int gs_indices[N_GRAYSCALE];
+  int i;
+  int irow;
+  int lastrow;
+  unsigned char *rowp;
+  int nx = im.nx();
+  int ny = im.ny();
+  ImageFileArray v = im.getArray();
+
+  rowp = (unsigned char *) sys_alloc(nx * nxcell,"sdf2d_to_img");
+  if (rowp == NULL)
+    return;
+
+  gif = gdImageCreate(nx * nxcell, ny * nycell);
+  for (i = 0; i < N_GRAYSCALE; i++)
+    gs_indices[i] = gdImageColorAllocate(gif, i, i, i);
+
+  lastrow = ny * nycell - 1;
+  for (irow = 0; irow < ny; irow++)
+    {
+      int icol, ir;
+      int rpos = irow * nycell;
+      for (ir = rpos; ir < rpos + nycell; ir++)
+	{
+	  for (icol = 0; icol < nx; icol++)
+	    {
+	      double dens;
+	      int ic;
+	      int cpos = icol * nxcell;
+	      dens = (v[icol][irow] - densmin) / (densmax - densmin);
+	      if (dens < 0)
+		dens = 0;
+	      else if (dens > 1)
+		dens = 1;
+	      for (ic = cpos; ic < cpos + nxcell; ic++)
+		{
+		  rowp[ic] = (unsigned int) (dens * (double) (N_GRAYSCALE - 1));
+		  gdImageSetPixel(gif, ic, lastrow - ir, gs_indices[rowp[ic]]);
+		}
+	    }
+	}
+    }
+  sys_free(rowp, "if2img");
+
+  if ((out = fopen(outfile,"w")) == NULL)
+    {
+      fprintf(stderr,"Error opening output file %s for writing\n", outfile);
+      exit(1);
+    }
+  gdImageGif(gif,out);
+  fclose(out);
+  gdImageDestroy(gif);
+#else
+  fprintf(stderr, "This version does not support GIF");
+#endif
+}
+
+#ifndef NO_MAIN
+int 
+main (int argc, char *const argv[])
+{
+  return (if2img_main(argc, argv));
+}
+#endif