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annotate scripts/image/private/imwrite_filename.m @ 19865:e9f89866074c

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maint: Cleanup some .m files to follow Octave coding conventions. * accumarray.m, validateattributes.m, iscolormap.m, __imread__.m, __imwrite__.m, imwrite_filename.m, strread.m, getappdata.m, appearance/annotation.m, shrinkfaces.m, rundemos.m, runtests.m, datenum.m, datestr.m: Break long lines before && and ||.
author John W. Eaton <jwe@octave.org>
date Thu, 26 Feb 2015 13:13:40 -0500
parents 9fc020886ae9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 2013-2015 Carnë Draug
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## The input check for imwrite needs to be done twice, once when imwrite
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20 ## is called the first time to find where the filename is, and a second
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21 ## time by __imwrite__ after imformats decides what function to use.
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22 ## Because a user can, and is encouraged to, get a function handle to
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23 ## __imwrite__, the input check is also done there.
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24 ## In addition, the input check for imwrite is not that straightforward
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25 ## in order to support the multiple ways the function can be called,
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26 ## and interpretations of Matlab documentation.
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27 ##
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28 ## Anyway, this will only do the input check until it finds the filename
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29 ## to be used, the only part that imwrite actually needs.
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30
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31 function [filename, ext, cmap, options] = imwrite_filename (varargin)
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32
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33 ## First, we check if the first argument is a colormap or a filename.
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34 cmap = [];
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35 if (ischar (varargin{1}))
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36 filename_idx = 1;
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37 elseif (numel (varargin) >= 2
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38 && iscolormap (varargin{1}) && ischar (varargin{2}))
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39 filename_idx = 2;
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40 cmap = varargin{1};
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41 else
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42 error ("imwrite: no FILENAME specified");
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43 endif
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44 filename = tilde_expand (varargin{filename_idx});
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45
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46 ## Next, we get the file extension.
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47 ## if we have an odd number of leftover arguments, and the next argument
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48 ## is a string, we consider it the file extension. Otherwise we will
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49 ## extract what we can from the previously found filename.
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50 options_idx = filename_idx + 1;
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51 if (numel (varargin) > filename_idx
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52 && rem (length (varargin) - filename_idx, 2) != 0
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53 && ischar (varargin{filename_idx + 1}))
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54 ext = varargin{filename_idx + 1};
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55 options_idx++;
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56 else
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57 [~, ~, ext] = fileparts (filename);
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58 if (! isempty (ext))
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59 ## remove dot from extension
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60 ext = ext(2:end);
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61 endif
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62 endif
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63
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64 ## After all the work finding where the filename was, we might as well
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65 ## send the leftovers list (they should be in key value pairs)
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66 options = varargin(options_idx:end);
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67
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68 endfunction
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69