/usr/share/octave/packages/image-2.2.2/private/im2float.m is in octave-image 2.2.2-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | ## Copyright (C) 2012 Carnë Draug <carandraug+dev@gmail.com>
##
## This program 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.
##
## 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, see <http://www.gnu.org/licenses/>.
## im2double and im2single are very similar so here's the common code,
## which is prety much all of it.
function im = im2float (out_class, caller_nargin, im, indexed = false)
## Input checking (private function that is used for all im2class functions)
im_class = imconversion (caller_nargin, ["im2" out_class], indexed, im);
converter = eval (["@" out_class]);
switch im_class
case {"single", "double", "logical"}
if (strcmp (im_class, out_class))
## do nothing, return the same
else
im = converter (im);
endif
case {"uint8", "uint16"}
if (indexed)
im = converter (im) + 1;
else
im = converter (im) / converter (intmax (im_class));
endif
case "int16"
im = (converter (im) + converter (intmax (im_class)) + 1) / converter (intmax ("uint16"));
otherwise
error ("unsupported image class %s", im_class);
endswitch
endfunction
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