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annotate scripts/image/private/imageIO.m @ 18538:fcd87f68af4f

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Deprecate nfields and replace with numfields. * NEWS: Announce deprecation of nfields and addition of new function numfields. * container.txi: Add numfields to the manual. * oct-map.cc (octave_map::cat): Change %!tests to use numfields. * ov-struct.cc (Fnumfields): Function renamed from nfields. * scripts/deprecated/nfields.m: Add m-file which warns about nfields deprecation. * scripts/deprecated/module.mk: Add nfields.m to build system. * fieldnames.m: Change seealso link to point to numfields. * __isequal__.m: Use numfields to simplify code. * imwrite.m: Replace 'isempty (fieldnames (fmt))' with 'numfields (fmt) > 0' for clarity. * imageIO.m: Replace 'isempty (fieldnames (fmt))' with 'numfields (fmt) > 0' for clarity. * importdata.m: Use numfields to simplify code. * assert.m: Use numfields to simplify code.
author Rik <rik@octave.org>
date Sun, 02 Mar 2014 12:56:11 -0800
parents 15db54c4a572
children 6ca096827123
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1 ## Copyright (C) 2013 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 ## This function the image input functions imread() and imfinfo() to the
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20 ## functions that will actually be used, based on their format. See below
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21 ## on the details on how it identifies the format, and to what it defaults.
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22 ##
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23 ## It will change the input arguments that were passed to imread() and
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24 ## imfinfo(). It will change the filename to provide the absolute filepath
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25 ## for the file, it will extract the possible format name from the rest of
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26 ## the input arguments (in case there was one), and will give an error if
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27 ## the file can't be found.
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28 ##
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29 ## Usage:
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30 ##
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31 ## func - Function name to use on error message.
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32 ## core_func - Function handle for the default function to use if we can't
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33 ## find the format in imformats.
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34 ## fieldname - Name of the field in the struct returned by imformats that
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35 ## has the function to use.
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36 ## filename - Most likely the first input argument from the function that
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37 ## called this. May be missing the file extension which can be
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38 ## on varargin.
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39 ## varargin - Followed by all the OTHER arguments passed to imread and
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40 ## imfinfo.
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41
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42 function varargout = imageIO (func, core_func, fieldname, filename, varargin)
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43
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44 ## First thing: figure out the filename and possibly download it.
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45 ## The first attempt is to try the filename and see if it exists. If it
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46 ## does not, we try to add the next argument since the file extension can
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47 ## be given as a separate argument. If we still can't find the file, it
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48 ## can be a URL. Lastly, if we still didn't found a file, try adding the
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49 ## extension to the URL
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50
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51 file_2_delete = false; # will we have to remove the file in the end?
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52 persistent abs_path = @(x) file_in_path (IMAGE_PATH, tilde_expand (x));
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53
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54 ## Filename was given with file extension
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55 fn = abs_path (filename);
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56 if (isempty (fn) && ! isempty (varargin))
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57 ## Maybe if we add a file extension
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58 fn = abs_path ([filename "." varargin{1}]);
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59 endif
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60
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61 ## Maybe we have an URL
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62 if (isempty (fn))
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63 file_2_delete = true; # mark file for deletion
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64 [fn, ~] = urlwrite (filename, tmpnam ());
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65 ## Maybe the URL is missing the file extension
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66 if (isempty (fn) && ! isempty (varargin))
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67 [fn, ~] = urlwrite ([filename "." varargin{1}], tmpnam ());
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68 endif
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69
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70 if (isempty (fn))
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71 error ("%s: unable to find file %s", func, filename);
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72 endif
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73 endif
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74
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75 ## unwind_protect block because we may have a file to remove in the end
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76 unwind_protect
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77
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78 ## When guessing the format to use, we first check if the second
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79 ## argument is a format defined in imformats. If so, we remove it
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80 ## from the rest of arguments before passing them on. If not, we
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81 ## try to guess the format from the file extension. Finally, if
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82 ## we still don't know the format, we use the Octave core functions
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83 ## which is the same for all formats.
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84 foo = []; # the function we will use
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85
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86 ## We check if the call to imformats (ext) worked using
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87 ## "numfields (fmt) > 0 because when it fails, the returned
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88 ## struct is not considered empty.
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89
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90 ## try the second input argument
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91 if (! isempty (varargin) && ischar (varargin{1}))
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92 fmt = imformats (varargin{1});
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93 if (numfields (fmt) > 0)
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94 foo = fmt.(fieldname);
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95 varargin(1) = []; # remove format name from arguments
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96 endif
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97 endif
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98
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99 ## try extension from file name
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100 if (isempty (foo))
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101 [~, ~, ext] = fileparts (fn);
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102 if (! isempty (ext))
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103 ## remove dot from extension
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104 ext = ext(2:end);
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105 endif
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106 fmt = imformats (ext);
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107 if (numfields (fmt) > 0)
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108 foo = fmt.(fieldname);
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109 endif
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110 endif
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111
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112 ## use the core function
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113 if (isempty (foo))
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114 foo = core_func;
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115 endif
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116
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117 [varargout{1:nargout}] = foo (fn, varargin{:});
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118
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119 unwind_protect_cleanup
15db54c4a572 Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
parents: 17338
diff changeset
120 if (file_2_delete)
15db54c4a572 Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
parents: 17338
diff changeset
121 unlink (fn);
15db54c4a572 Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
parents: 17338
diff changeset
122 endif
15db54c4a572 Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
parents: 17338
diff changeset
123 end_unwind_protect
15db54c4a572 Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
parents: 17338
diff changeset
124
16906
bfad37d33435 Connect imfinfo with imformats.
Carnë Draug <carandraug@octave.org>
parents:
diff changeset
125 endfunction
17338
1c89599167a6 maint: End m-files with 1 blank line.
Rik <rik@octave.org>
parents: 16984
diff changeset
126