--- /dev/null
+## Copyright (C) 1994-2012 John W. Eaton
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave 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 Octave; see the file COPYING. If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} saveimage (@var{fname}, @var{img}, @var{fmt})
+## @deftypefnx {Function File} {} saveimage (@var{fname}, @var{img}, @var{fmt}, @var{map})
+## Save the matrix @var{img} to file @var{fname} in image format @var{fmt}.
+## Valid values for @var{fmt} are
+##
+## @table @asis
+## @item "img"
+## Octave's image format. The current colormap is also saved in the file.
+##
+## @item "ppm"
+## Portable pixmap format.
+##
+## @item "ps"
+## PostScript format.
+## @end table
+##
+## If the fourth argument is supplied, the specified colormap will also be
+## saved along with the image.
+##
+## Note: if the colormap contains only two entries and these entries are
+## black and white, the bitmap ppm and PostScript formats are used. If the
+## image is a gray scale image (the entries within each row of the colormap
+## are equal) the gray scale ppm and PostScript image formats are used,
+## otherwise the full color formats are used.
+## @seealso{imread, save, load, colormap}
+## @end deftypefn
+
+## The conversion to PostScript is based on pbmtolps.c, which was
+## written by
+##
+## George Phillips <phillips@cs.ubc.ca>
+## Department of Computer Science
+## University of British Columbia
+##
+## and is part of the portable bitmap utilities,
+
+## Author: Tony Richardson <arichard@stark.cc.oh.us>
+## Created: July 1994
+## Adapted-By: jwe
+
+## Rewritten by jwe to avoid using octoppm and pbm routines so that
+## people who don't have the pbm stuff installed can still use this
+## function.
+##
+## The conversion to PostScript is based on pnmtops.c, which is part of
+## the portable bitmap utilties and bears this copyright notice:
+##
+## Copyright (C) 1989 by Jef Poskanzer.
+##
+## Permission to use, copy, modify, and distribute this software and its
+## documentation for any purpose and without fee is hereby granted, provided
+## that the above copyright notice appear in all copies and that both that
+## copyright notice and this permission notice appear in supporting
+## documentation. This software is provided "as is" without express or
+## implied warranty.
+
+function saveimage (fname, img, fmt, map)
+
+ persistent warned = false;
+ if (! warned)
+ warned = true;
+ warning ("Octave:deprecated-function",
+ "saveimage is obsolete and will be removed from a future version of Octave; please use imwrite instead");
+ endif
+
+ if (nargin < 2 || nargin > 4)
+ print_usage ();
+ endif
+
+ if (nargin < 4)
+ if (size(img, 3) == 3)
+ [img, map] = rgb2ind(img);
+ else
+ map = colormap ();
+ endif
+ endif
+
+ [map_nr, map_nc] = size (map);
+
+ if (map_nc != 3)
+ error ("saveimage: MAP must be an N x 3 matrix");
+ endif
+
+ if (nargin < 3)
+ fmt = "img";
+ elseif (! ischar (fmt))
+ error ("saveimage: FMT specification must be a string");
+ elseif (! (strcmp (fmt, "img")
+ || strcmp (fmt, "ppm")
+ || strcmp (fmt, "ps")))
+ error ("saveimage: unsupported image format specification");
+ endif
+
+ if (! ismatrix (img))
+ warning ("IMG variable is not a matrix");
+ endif
+
+ if (! ischar (fname))
+ error ("saveimage: FNAME must be a string");
+ endif
+
+ ## If we just want Octave image format, save and return.
+
+ if (strcmp (fmt, "img"))
+ save ("-text", fname, "map", "img");
+ return;
+ endif
+
+ ## Convert to another format if requested.
+
+ grey = all (map(:,1) == map(:,2) && map(:,1) == map (:,3));
+
+ pbm = pgm = ppm = 0;
+
+ map_sz = map_nr * map_nc;
+
+ map = reshape (map, map_sz, 1);
+
+ map (map > 1) = 1;
+ map (map < 0) = 0;
+
+ map = round (255 * map);
+
+ bw = (map_nr == 2
+ && ((map(1,1) == 0 && map(2,1) == 255)
+ || (map(1,1) == 255 && map(2,1) == 0)));
+
+ img = round (img');
+ [img_nr, img_nc] = size (img);
+
+ img_sz = img_nr * img_nc;
+ img = reshape (img, img_sz, 1);
+
+ img (img > map_nr) = map_nr;
+ img (img <= 0) = 1;
+
+ if (strcmp (fmt, "ppm"))
+
+ ## Would be nice to make this consistent with the line used by the
+ ## load/save functions, but we need a good way to get username and
+ ## hostname information.
+
+ time_string = ctime (time ());
+ time_string = time_string (1:length (time_string)-1);
+ tagline = sprintf ("# Created by Octave %s, %s",
+ OCTAVE_VERSION, time_string);
+
+ if (grey && bw)
+
+ if (map(1) != 0)
+ map = [0; 1];
+ else
+ map = [1; 0];
+ endif
+
+ n_long = rem (img_nc, 8);
+ tmp = zeros (ceil (img_nc/8), img_nr);
+
+ k = ceil (img_nr/8);
+ tmp = zeros (k, img_nc);
+
+ ## Append columns with zeros to original image so that
+ ## mod (cols, 8) = 0.
+
+ bwimg = postpad (reshape (map(img), img_nr, img_nc), k * 8, 0);
+
+ b = kron (pow2 (7:-1:0)', ones (1, img_nc));
+
+ for i = 1:k
+ tmp(i,:) = sum (bwimg(8*(i-1)+1:8*i,:) .* b);
+ endfor
+
+ fid = fopen (fname, "wb");
+ fprintf (fid, "P4\n%s\n%d %d\n", tagline, img_nr, img_nc);
+ fwrite (fid, tmp, "uchar");
+ fprintf (fid, "\n");
+ fclose (fid);
+
+ elseif (grey)
+
+ fid = fopen (fname, "wb");
+ fprintf (fid, "P5\n%s\n%d %d\n255\n", tagline, img_nr, img_nc);
+ fwrite (fid, map(img), "uchar");
+ fprintf (fid, "\n");
+ fclose (fid);
+
+ else
+
+ img_idx = ((1:3:3*img_sz)+2)';
+ map_idx = ((2*map_nr+1):map_sz)';
+
+ tmap = map(map_idx);
+ tmp(img_idx--) = tmap(img);
+
+ map_idx = map_idx - map_nr;
+ tmap = map(map_idx);
+ tmp(img_idx--) = tmap(img);
+
+ map_idx = map_idx - map_nr;
+ tmap = map(map_idx);
+ tmp(img_idx--) = tmap(img);
+
+ fid = fopen (fname, "wb");
+ fprintf (fid, "P6\n%s\n%d %d\n255\n", tagline, img_nr, img_nc);
+ fwrite (fid, tmp, "uchar");
+ fprintf (fid, "\n");
+ fclose (fid);
+
+ endif
+
+ elseif (strcmp (fmt, "ps") == 1)
+
+ if (! grey)
+ error ("saveimage: must have a greyscale colormap for conversion to PostScript");
+ endif
+
+ bps = 8;
+ dpi = 300;
+ pagewid = 612;
+ pagehgt = 762;
+ MARGIN = 0.95;
+ devpix = dpi / 72.0 + 0.5;
+ pixfac = 72.0 / dpi * devpix;
+
+ ## Compute padding to round cols * bps up to the nearest multiple of 8
+ ## (nr and nc are switched because we transposed the image above).
+
+ padright = (((img_nr * bps + 7) / 8) * 8 - img_nr * bps) / bps;
+
+ scols = img_nr * pixfac;
+ srows = img_nc * pixfac;
+ scale = 1;
+
+ if (scols > pagewid * MARGIN || srows > pagehgt * MARGIN)
+ if (scols > pagewid * MARGIN)
+ scale = scale * (pagewid / scols * MARGIN);
+ scols = scale * img_nr * pixfac;
+ srows = scale * img_nc * pixfac;
+ endif
+ if (srows > pagehgt * MARGIN)
+ scale = scale * (pagehgt / srows * MARGIN);
+ scols = scale * img_nr * pixfac;
+ srows = scale * img_nc * pixfac;
+ endif
+ warning ("image too large for page, rescaling to %g", scale);
+ endif
+
+ llx = (pagewid - scols) / 2;
+ lly = (pagehgt - srows) / 2;
+ urx = llx + fix (scols + 0.5);
+ ury = lly + fix (srows + 0.5);
+
+ fid = fopen (fname, "wb");
+
+ fprintf (fid, "%%!PS-Adobe-2.0 EPSF-2.0\n");
+ fprintf (fid, "%%%%Creator: Octave %s (saveimage.m)\n", OCTAVE_VERSION);
+ fprintf (fid, "%%%%Title: %s\n", fname);
+ fprintf (fid, "%%%%Pages: 1\n");
+ fprintf (fid, "%%%%BoundingBox: %d %d %d %d\n",
+ fix (llx), fix (lly), fix (urx), fix (ury));
+ fprintf (fid, "%%%%EndComments\n");
+ fprintf (fid, "/readstring {\n");
+ fprintf (fid, " currentfile exch readhexstring pop\n");
+ fprintf (fid, "} bind def\n");
+ fprintf (fid, "/picstr %d string def\n",
+ fix ((img_nr + padright) * bps / 8));
+ fprintf (fid, "%%%%EndProlog\n");
+ fprintf (fid, "%%%%Page: 1 1\n");
+ fprintf (fid, "gsave\n");
+ fprintf (fid, "%g %g translate\n", llx, lly);
+ fprintf (fid, "%g %g scale\n", scols, srows);
+ fprintf (fid, "%d %d %d\n", img_nr, img_nc, bps);
+ fprintf (fid, "[ %d 0 0 -%d 0 %d ]\n", img_nr, img_nc, img_nc);
+ fprintf (fid, "{ picstr readstring }\n");
+ fprintf (fid, "image\n");
+
+ img = map(img);
+
+ fmt = "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n";
+ fprintf (fid, fmt, img);
+
+ if (rem (img_sz, 30) != 0)
+ fprintf (fid, "\n");
+ endif
+
+ fprintf (fid, "grestore\n");
+ fprintf (fid, "showpage\n");
+ fprintf (fid, "%%%%Trailer\n");
+ fclose (fid);
+
+ else
+ error ("saveimage: what happened to the image type?");
+ endif
+
+endfunction
git://git.creatis.insa-lyon.fr / CreaPhase.git / blobdiff