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annotate scripts/image/private/imageIO.m @ 30893:e1788b1a315f

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maint: Use "fcn" as preferred abbreviation for "function" in m-files. * accumarray.m, accumdim.m, quadl.m, quadv.m, randi.m, structfun.m, __is_function__.m, uigetfile.m, uimenu.m, uiputfile.m, doc_cache_create.m, colorspace_conversion_input_check.m, imageIO.m, argnames.m, vectorize.m, vectorize.m, normest1.m, inputname.m, nthargout.m, display_info_file.m, decic.m, ode15i.m, ode15s.m, ode23.m, ode23s.m, ode45.m, odeset.m, check_default_input.m, integrate_adaptive.m, ode_event_handler.m, runge_kutta_23.m, runge_kutta_23s.m, runge_kutta_45_dorpri.m, runge_kutta_interpolate.m, starting_stepsize.m, __all_opts__.m, fminbnd.m, fminsearch.m, fminunc.m, fsolve.m, fzero.m, sqp.m, fplot.m, plotyy.m, __bar__.m, __ezplot__.m, flat_entry.html, profexport.m, movfun.m, bicg.m, bicgstab.m, cgs.m, eigs.m, gmres.m, pcg.m, __alltohandles__.m, __sprand__.m, qmr.m, tfqmr.m, dump_demos.m: Replace "func", "fun", "fn" in documentation and variable names with "fcn".
author Rik <rik@octave.org>
date Mon, 04 Apr 2022 18:14:56 -0700
parents 796f54d4ddbf
children 505ed551e366
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 2013-2022 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## This function the image input functions imread() and imfinfo() to the
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27 ## functions that will actually be used, based on their format. See below
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28 ## on the details on how it identifies the format, and to what it defaults.
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29 ##
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30 ## It will change the input arguments that were passed to imread() and
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31 ## imfinfo(). It will change the filename to provide the absolute filepath
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32 ## for the file, it will extract the possible format name from the rest of
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33 ## the input arguments (in case there was one), and will give an error if
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34 ## the file can't be found.
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35 ##
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36 ## Usage:
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37 ##
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38 ## fcn - Function name to use on error message.
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39 ## core_fcn - Function handle for the default function to use if we can't
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40 ## find the format in imformats.
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41 ## fieldname - Name of the field in the struct returned by imformats that
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42 ## has the function to use.
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43 ## filename - Most likely the first input argument from the function that
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44 ## called this. May be missing the file extension which can be
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45 ## on varargin.
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46 ## varargin - Followed by all the OTHER arguments passed to imread and
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47 ## imfinfo.
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48
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49 function varargout = imageIO (fcn, core_fcn, fieldname, filename, varargin)
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50
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51 ## First thing: figure out the filename and possibly download it.
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52 ## The first attempt is to try the filename and see if it exists. If it
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53 ## does not, we try to add the next argument since the file extension can
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54 ## be given as a separate argument. If we still can't find the file, it
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55 ## can be a URL. Lastly, if we still didn't found a file, try adding the
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56 ## extension to the URL
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57
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58 file_2_delete = false; # will we have to remove the file in the end?
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59 persistent abs_path = @(x) file_in_path (IMAGE_PATH, tilde_expand (x));
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60
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61 ## Filename was given with file extension
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62 fn = abs_path (filename);
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63 if (isempty (fn) && ! isempty (varargin))
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64 ## Maybe if we add a file extension?
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65 fn = abs_path ([filename "." varargin{1}]);
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66 endif
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67
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68 ## Maybe we have a URL
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69 if (isempty (fn)
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70 && ! isempty (regexp (filename, '^[a-zA-Z][a-zA-Z0-9.+-]+:')))
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71 file_2_delete = true; # mark file for deletion
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72 [fn, ~] = urlwrite (filename, tempname ());
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73 ## Maybe the URL is missing the file extension?
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74 if (isempty (fn) && ! isempty (varargin))
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75 [fn, ~] = urlwrite ([filename "." varargin{1}], tempname ());
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76 endif
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77 endif
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78
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79 if (isempty (fn))
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80 error ([fcn ": unable to find file '" filename "'"]);
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81 endif
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82
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83 ## unwind_protect block because we may have a file to remove in the end
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84 unwind_protect
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85
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86 ## When guessing the format to use, we first check if the second
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87 ## argument is a format defined in imformats. If so, we remove it
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88 ## from the rest of arguments before passing them on. If not, we
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89 ## try to guess the format from the file extension. Finally, if
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90 ## we still don't know the format, we use the Octave core functions
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91 ## which is the same for all formats.
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92 hfcn = []; # the function we will use
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93
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94 ## We check if the call to imformats (ext) worked using
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95 ## "numfields (fmt) > 0 because when it fails, the returned
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96 ## struct is not considered empty.
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97
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98 ## try the second input argument
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99 if (! isempty (varargin) && ischar (varargin{1}))
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100 fmt = imformats (varargin{1});
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101 if (numfields (fmt) > 0)
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102 hfcn = fmt.(fieldname);
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103 varargin(1) = []; # remove format name from arguments
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104 endif
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105 endif
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106
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107 ## try extension from filename
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108 if (isempty (hfcn))
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109 [~, ~, ext] = fileparts (fn);
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110 if (! isempty (ext))
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111 ## remove dot from extension
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112 ext = ext(2:end);
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113 endif
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114 fmt = imformats (ext);
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115 if (numfields (fmt) > 0)
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116 hfcn = fmt.(fieldname);
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117 endif
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118 endif
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119
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120 ## use the core function
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121 if (isempty (hfcn))
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122 hfcn = core_fcn;
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123 endif
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124
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125 [varargout{1:nargout}] = hfcn (fn, varargin{:});
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126
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127 unwind_protect_cleanup
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128 if (file_2_delete)
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129 unlink (fn);
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130 endif
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131 end_unwind_protect
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132
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133 endfunction