Mercurial > octave
annotate scripts/image/imformats.m @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
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1 ## Copyright (C) 2013-2020 The Octave Project Developers |
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2 ## |
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3 ## See the file COPYRIGHT.md in the top-level directory of this distribution |
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4 ## or <https://octave.org/COPYRIGHT.html/>. |
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5 ## |
16901 | 6 ## |
7 ## This file is part of Octave. | |
8 ## | |
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9 ## Octave is free software: you can redistribute it and/or modify it |
16901 | 10 ## under the terms of the GNU General Public License as published by |
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11 ## the Free Software Foundation, either version 3 of the License, or |
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12 ## (at your option) any later version. |
16901 | 13 ## |
14 ## Octave is distributed in the hope that it will be useful, but | |
15 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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16 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 ## GNU General Public License for more details. |
16901 | 18 ## |
19 ## You should have received a copy of the GNU General Public License | |
20 ## along with Octave; see the file COPYING. If not, see | |
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21 ## <https://www.gnu.org/licenses/>. |
16901 | 22 |
23 ## -*- texinfo -*- | |
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24 ## @deftypefn {} {} imformats () |
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25 ## @deftypefnx {} {@var{formats} =} imformats (@var{ext}) |
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26 ## @deftypefnx {} {@var{formats} =} imformats (@var{format}) |
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27 ## @deftypefnx {} {@var{formats} =} imformats ("add", @var{format}) |
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28 ## @deftypefnx {} {@var{formats} =} imformats ("remove", @var{ext}) |
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29 ## @deftypefnx {} {@var{formats} =} imformats ("update", @var{ext}, @var{format}) |
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30 ## @deftypefnx {} {@var{formats} =} imformats ("factory") |
16901 | 31 ## Manage supported image formats. |
32 ## | |
33 ## @var{formats} is a structure with information about each supported file | |
34 ## format, or from a specific format @var{ext}, the value displayed on the | |
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35 ## field @var{ext}. It contains the following fields: |
16901 | 36 ## |
37 ## @table @asis | |
38 ## @item ext | |
39 ## The name of the file format. This may match the file extension but Octave | |
40 ## will automatically detect the file format. | |
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41 ## |
16901 | 42 ## @item description |
43 ## A long description of the file format. | |
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44 ## |
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45 ## @item @nospell{isa} |
16901 | 46 ## A function handle to confirm if a file is of the specified format. |
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47 ## |
16901 | 48 ## @item write |
49 ## A function handle to write if a file is of the specified format. | |
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50 ## |
16901 | 51 ## @item read |
52 ## A function handle to open files the specified format. | |
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53 ## |
16901 | 54 ## @item info |
55 ## A function handle to obtain image information of the specified format. | |
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56 ## |
16901 | 57 ## @item alpha |
58 ## Logical value if format supports alpha channel (transparency or matte). | |
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59 ## |
16901 | 60 ## @item multipage |
61 ## Logical value if format supports multipage (multiple images per file). | |
62 ## @end table | |
63 ## | |
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64 ## It is possible to change the way Octave manages file formats with the |
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65 ## options @qcode{"add"}, @qcode{"remove"}, and @qcode{"update"}, and supplying |
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66 ## a structure @var{format} with the required fields. The option |
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67 ## @qcode{"factory"} resets the configuration to the default. |
16901 | 68 ## |
69 ## This can be used by Octave packages to extend the image reading capabilities | |
70 ## Octave, through use of the PKG_ADD and PKG_DEL commands. | |
71 ## | |
72 ## @seealso{imfinfo, imread, imwrite} | |
73 ## @end deftypefn | |
74 | |
75 ## Author: Carnë Draug <carandraug@octave.org> | |
76 | |
77 function varargout = imformats (arg1, arg2, arg3) | |
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78 |
16901 | 79 if (nargin > 3) |
80 print_usage (); | |
81 endif | |
82 | |
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83 mlock (); # prevent formats to be removed by "clear all" |
16901 | 84 persistent formats = default_formats (); |
85 | |
86 if (nargin == 0 && nargout == 0) | |
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87 pretty_print_formats (formats); |
16901 | 88 elseif (nargin >= 1) |
89 if (isstruct (arg1)) | |
90 arrayfun (@is_valid_format, arg1); | |
91 ## FIXME: what is the return value in this situation? | |
92 formats = arg1; | |
93 | |
94 elseif (ischar (arg1)) | |
95 switch (tolower (arg1)) | |
96 case "add", | |
97 if (! isstruct (arg2)) | |
98 error ("imformats: FORMAT to %s must be a structure.", arg1); | |
99 endif | |
100 arrayfun (@is_valid_format, arg2); | |
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101 formats(end + 1: end + numel (arg2)) = arg2; |
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102 varargout{1} = formats; |
16901 | 103 |
104 case {"remove", "update"}, | |
105 if (! ischar (arg2)) | |
106 error ("imformats: EXT to %s must be a string.", arg1); | |
107 endif | |
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108 ## FIXME: suppose a format with multiple extensions. If one of |
16901 | 109 ## them is requested to be removed, should we remove the |
110 ## whole format, or just that extension from the format? | |
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111 match = find_ext_idx (formats, arg2); |
16901 | 112 if (! any (match)) |
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113 error ("imformats: no EXT '%s' found.", arg2); |
16901 | 114 endif |
115 if (strcmpi (arg1, "remove")) | |
116 formats(match) = []; | |
117 else | |
118 ## then it's update | |
119 if (! isstruct (arg3)) | |
120 error ("imformats: FORMAT to update must be a structure."); | |
121 endif | |
122 is_valid_format (arg3); | |
123 formats(match) = arg3; | |
124 endif | |
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125 varargout{1} = formats; |
16901 | 126 |
127 case "factory", | |
128 formats = default_formats (); | |
129 otherwise | |
130 ## then we look for a format with that extension. | |
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131 match = find_ext_idx (formats, arg1); |
16901 | 132 ## For matlab compatibility, if we don't find any format we must |
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133 ## return an empty struct with NO fields. We can't use match as mask |
16901 | 134 if (any (match)) |
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135 varargout{1} = formats(match); |
16901 | 136 else |
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137 varargout{1} = struct (); |
16901 | 138 endif |
139 endswitch | |
140 else | |
141 error ("imformats: first argument must be either a structure or string."); | |
142 endif | |
143 else | |
144 varargout{1} = formats; | |
145 endif | |
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146 |
16901 | 147 endfunction |
148 | |
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149 function rformats = default_formats () |
16901 | 150 |
151 ## The available formats are dependent on what the user has installed at | |
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152 ## a given time, and how GraphicsMagick was built. Checking for |
16901 | 153 ## GraphicsMagick features when building Octave is not enough since it |
154 ## delegates some of them to external programs which can be removed or | |
155 ## installed at any time. | |
156 ## The recommended method would be to use CoderInfoList() to get a list of | |
157 ## all available coders and try to write and read back a small test image. | |
158 ## But this will not work since some coders are readable or writable only. | |
159 ## It will still fail if we test only the ones marked as readable and | |
160 ## writable because some RW coders are not of image formats (NULL, 8BIM, | |
161 ## or EXIF for example). | |
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162 ## So we'd need a blacklist (unacceptable because a 'bad' coder may be |
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163 ## added later) or a whitelist. A whitelist means that even with a |
16901 | 164 ## super-fancy recent build of GraphicsMagick, some formats won't be listed |
165 ## by imformats but in truth, we will still be able to read and write them | |
166 ## since imread() and imwrite() will give it a try anyway. | |
167 ## | |
168 ## For more info and comments from the GraphicsMagick main developer, see | |
169 ## http://sourceforge.net/mailarchive/forum.php?thread_name=alpine.GSO.2.01.1304301916050.2267%40freddy.simplesystems.org&forum_name=graphicsmagick-help | |
170 | |
171 persistent formats = struct ( "coder", {}, | |
172 "ext", {}, | |
173 "isa", {}, | |
174 "info", {}, | |
175 "read", {}, | |
176 "write", {}, | |
177 "alpha", {}, | |
178 "description", {}, | |
179 "multipage", {}); | |
180 | |
181 ## Image IO abilities won't change during the same Octave session, | |
182 ## there's no need to go and calculate it all over again if we are | |
183 ## requested to reset back to factory. | |
184 if (! isempty (formats)) | |
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185 rformats = formats; |
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186 return; |
16901 | 187 endif |
188 | |
189 ## Building the formats info | |
190 ## | |
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191 ## As mentioned above we start with a whitelist of coders. Since the |
16901 | 192 ## GraphicsMagick build may be missing some coders, we will remove those |
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193 ## from the list. Some info can be obtained directly from GraphicsMagick |
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194 ## through the CoderInfo object. However, some will need to be hardcoded. |
16901 | 195 ## |
196 ## The association between file extensions and coders needs to be done | |
197 ## with a manually coded list (file extensions do not define the image | |
198 ## format and GraphicsMagick will not be fooled by changing the extension). | |
199 ## | |
200 ## We can get the read, write, description and multipage fields from | |
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201 ## CoderInfo in C++. We should do the same for alpha (GraphicsMagick |
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202 ## calls it matte) but it's not available from CoderInfo. The only way to |
16901 | 203 ## check it is to create a sample image with each coder, then try to read |
204 ## it back with GraphicsMagick and use the matte method on the Image class. | |
205 ## But making such test for each Octave session... meh! While technically | |
206 ## it may be possible that the same coder has different support for alpha | |
207 ## channel in different versions and builds, this doesn't seem to happen. | |
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208 ## So we also hardcode those. In the future, maybe the CoderInfo class will |
16901 | 209 ## have a matte method like it does for multipage. |
210 ## | |
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211 ## Other notes: some formats have more than one coder that do the same. For |
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212 ## example, for jpeg images there is both the JPG and JPEG coders. However, |
16901 | 213 ## it seems that when reading images, GraphicsMagick only uses one of them |
214 ## and that's the one we list (it's the one reported by imfinfo and that we | |
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215 ## can use for isa). However, in some cases GraphicsMagick seems to rely |
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216 ## uniquely on the file extension (JBIG and JBG at least. Create an image |
16901 | 217 ## with each of those coders, swap their extension and it will report the |
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218 ## other coder). We don't have such cases on the whitelist but if we did, we |
16901 | 219 ## would need two entries for such cases. |
220 | |
221 ## each row: 1st => Coder, 2nd=> file extensions, 3rd=> alpha | |
222 coders = {"BMP", {"bmp"}, true; | |
223 "CUR", {"cur"}, false; | |
224 "GIF", {"gif"}, true; | |
225 "ICO", {"ico"}, true; | |
226 "JBG", {"jbg"}, false; | |
227 "JBIG", {"jbig"}, false; | |
228 "JP2", {"jp2", "jpx"}, true; | |
229 "JPEG", {"jpg", "jpeg"}, false; # there is also a JPG coder | |
230 "PBM", {"pbm"}, false; | |
231 "PCX", {"pcx"}, true; | |
232 "PGM", {"pgm"}, false; | |
233 "PNG", {"png"}, true; | |
234 ## PNM is a family of formats supporting portable bitmaps (PBM), | |
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235 ## graymaps (PGM), and pixmaps (PPM). There is no file format |
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236 ## associated with pnm itself. If PNM is used as the output format |
16901 | 237 ## specifier, then GraphicsMagick automatically selects the most |
238 ## appropriate format to represent the image. | |
239 "PNM", {"pnm"}, true; | |
240 "PPM", {"ppm"}, false; | |
241 "SUN", {"ras"}, true; # SUN Rasterfile | |
242 "TGA", {"tga", "tpic"}, true; | |
243 "TIFF", {"tif", "tiff"}, true; | |
244 "XBM", {"xbm"}, false; | |
245 "XPM", {"xpm"}, true; | |
246 "XWD", {"xwd"}, false; | |
247 }; | |
248 | |
249 for fidx = 1: rows(coders) | |
250 formats(fidx).coder = coders{fidx, 1}; | |
251 formats(fidx).ext = coders{fidx, 2}; | |
252 formats(fidx).alpha = coders{fidx, 3}; | |
253 ## default isa is to check if the format returned by imfinfo is the coder | |
254 formats(fidx).isa = @(x) isa_magick (coders{fidx,1}, x); | |
255 endfor | |
256 | |
257 ## the default info, read, and write functions | |
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258 [formats.info ] = deal (@__imfinfo__); |
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259 [formats.read ] = deal (@__imread__); |
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260 [formats.write] = deal (@__imwrite__); |
16901 | 261 |
262 ## fills rest of format information by checking with GraphicsMagick | |
263 formats = __magick_formats__ (formats); | |
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264 |
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265 rformats = formats; |
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266 |
16901 | 267 endfunction |
268 | |
269 function is_valid_format (format) | |
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270 ## the minimal list of fields required in the structure. We don't |
16901 | 271 ## require multipage because it doesn't exist in matlab |
272 min_fields = {"ext", "read", "isa", "write", "info", "alpha", "description"}; | |
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273 fields_mask = isfield (format, min_fields); |
16901 | 274 if (! all (fields_mask)) |
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275 error ("imformats: structure has missing field '%s'.", min_fields(! fields_mask){1}); |
16901 | 276 endif |
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277 |
16901 | 278 endfunction |
279 | |
280 function match = find_ext_idx (formats, ext) | |
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281 ## FIXME: what should we do if there's more than one hit? |
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282 ## Should this function prevent the addition of |
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283 ## duplicated extensions? |
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284 match = cellfun (@(x) any (strcmpi (x, ext)), {formats.ext}); |
16901 | 285 endfunction |
286 | |
287 function bool = isa_magick (coder, filename) | |
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288 |
16901 | 289 bool = false; |
290 try | |
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291 info = __magick_ping__ (filename, 1); |
16901 | 292 bool = strcmp (coder, info.Format); |
293 end_try_catch | |
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294 |
16901 | 295 endfunction |
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296 |
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297 function pretty_print_formats (formats) |
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298 ## define header names (none should be shorter than 3 characters) |
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299 headers = {"Extension", "isa", "Info", "Read", "Write", "Alpha", "Description"}; |
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300 cols_length = cellfun (@numel, headers); |
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301 |
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302 ## Adjust the maximal length of the extensions column |
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303 extensions = cellfun (@strjoin, {formats.ext}, {", "}, |
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304 "UniformOutput", false); |
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305 cols_length(1) = max (max (cellfun (@numel, extensions)), cols_length(1)); |
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306 headers{1} = postpad (headers{1}, cols_length(1), " "); |
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307 |
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308 ## Print the headers |
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309 disp (strjoin (headers, " | ")); |
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310 under_headers = cellfun (@(x) repmat ("-", 1, numel (x)), headers, |
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311 "UniformOutput", false); |
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312 disp (strjoin (under_headers, "-+-")); |
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313 |
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314 template = strjoin (arrayfun (@(x) sprintf ("%%-%is", x), cols_length, |
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315 "UniformOutput", false), " | "); |
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316 |
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317 ## Print the function handle for this things won't be a pretty table. So |
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318 ## instead we replace them with "yes" or "no", based on the support it has. |
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319 yes_no_cols = cat (2, {formats.isa}(:), {formats.info}(:), {formats.read}(:), |
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320 {formats.write}(:), {formats.alpha}(:)); |
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321 empty = cellfun (@isempty, yes_no_cols); |
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322 yes_no_cols(empty) = "no"; |
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323 yes_no_cols(! empty) = "yes"; |
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324 |
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325 descriptions = {formats.description}; |
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326 table = cat (2, extensions(:), yes_no_cols, descriptions(:)); |
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327 printf ([template "\n"], table'{:}); |
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328 |
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329 endfunction |
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330 |
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331 |
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332 ## This must work, even without support for image IO |
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333 %!test |
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334 %! formats = imformats (); |
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335 %! assert (isstruct (formats)); |
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336 %! |
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337 %! min_fields = {"ext", "read", "isa", "write", "info", "alpha", "description"}; |
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338 %! assert (all (ismember (min_fields, fieldnames (formats)))); |
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339 %! |
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340 %! if (__have_feature__ ("MAGICK")) |
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341 %! assert (numel (formats) > 0); |
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342 %! else |
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343 %! assert (numel (formats), 0); |
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344 %! endif |
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345 |
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346 ## When imread or imfinfo are called, the file must exist or the |
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347 ## function defined by imformats will never be called. Because |
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348 ## of this, we must create a file for the tests to work. |
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349 |
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350 ## changing the function that does the reading |
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351 %!testif HAVE_MAGICK |
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352 %! fname = [tempname() ".jpg"]; |
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353 %! def_fmt = imformats (); |
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354 %! fid = fopen (fname, "w"); |
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355 %! unwind_protect |
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356 %! fmt = imformats ("jpg"); |
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357 %! fmt.read = @numel; |
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358 %! imformats ("update", "jpg", fmt); |
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359 %! assert (imread (fname), numel (fname)); |
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360 %! unwind_protect_cleanup |
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361 %! fclose (fid); |
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362 %! unlink (fname); |
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363 %! imformats (def_fmt); |
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364 %! end_unwind_protect |
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365 |
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366 ## adding a new format |
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367 %!testif HAVE_MAGICK |
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368 %! fname = [tempname() ".new_fmt"]; |
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369 %! def_fmt = imformats (); |
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370 %! fid = fopen (fname, "w"); |
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371 %! unwind_protect |
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372 %! fmt = imformats ("jpg"); # take jpg as template |
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373 %! fmt.ext = "new_fmt"; |
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374 %! fmt.read = @() true (); |
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375 %! imformats ("add", fmt); |
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376 %! assert (imread (fname), true); |
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377 %! unwind_protect_cleanup |
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378 %! fclose (fid); |
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379 %! unlink (fname); |
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380 %! imformats (def_fmt); |
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381 %! end_unwind_protect |
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382 |
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383 ## adding multiple formats at the same time |
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384 %!testif HAVE_MAGICK |
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385 %! fname1 = [tempname() ".new_fmt1"]; |
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386 %! fid1 = fopen (fname1, "w"); |
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387 %! fname2 = [tempname() ".new_fmt2"]; |
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Carnë Draug <carandraug@octave.org>
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388 %! fid2 = fopen (fname2, "w"); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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389 %! def_fmt = imformats (); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
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390 %! unwind_protect |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
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391 %! fmt = imformats ("jpg"); # take jpg as template |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
parents:
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392 %! fmt.ext = "new_fmt1"; |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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393 %! fmt.read = @() true(); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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394 %! fmt(2) = fmt(1); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
parents:
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395 %! fmt(2).ext = "new_fmt2"; |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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396 %! imformats ("add", fmt); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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397 %! assert (imread (fname1), true); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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398 %! assert (imread (fname2), true); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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399 %! unwind_protect_cleanup |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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400 %! fclose (fid1); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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401 %! fclose (fid2); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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402 %! unlink (fname1); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
parents:
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403 %! unlink (fname2); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
parents:
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404 %! imformats (def_fmt); |
15db54c4a572
Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
Carnë Draug <carandraug@octave.org>
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405 %! end_unwind_protect |
16949
1eb5e5f0ee13
imformats.m: add tests and fix bug when adding new formats.
Carnë Draug <carandraug@octave.org>
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406 |
18298
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Fix input parsing for imageIO functions and make imread accept URL (bug #41234)
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407 ## changing format and resetting back to default |
16949
1eb5e5f0ee13
imformats.m: add tests and fix bug when adding new formats.
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408 %!testif HAVE_MAGICK |
1eb5e5f0ee13
imformats.m: add tests and fix bug when adding new formats.
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409 %! ori_fmt = mod_fmt = imformats ("jpg"); |
1eb5e5f0ee13
imformats.m: add tests and fix bug when adding new formats.
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410 %! mod_fmt.description = "Another description"; |
1eb5e5f0ee13
imformats.m: add tests and fix bug when adding new formats.
Carnë Draug <carandraug@octave.org>
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411 %! imformats ("update", "jpg", mod_fmt); |
1eb5e5f0ee13
imformats.m: add tests and fix bug when adding new formats.
Carnë Draug <carandraug@octave.org>
parents:
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412 %! new_fmt = imformats ("jpg"); |
1eb5e5f0ee13
imformats.m: add tests and fix bug when adding new formats.
Carnë Draug <carandraug@octave.org>
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413 %! assert (new_fmt.description, mod_fmt.description); |
1eb5e5f0ee13
imformats.m: add tests and fix bug when adding new formats.
Carnë Draug <carandraug@octave.org>
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414 %! imformats ("factory"); |
1eb5e5f0ee13
imformats.m: add tests and fix bug when adding new formats.
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415 %! new_fmt = imformats ("jpg"); |
1eb5e5f0ee13
imformats.m: add tests and fix bug when adding new formats.
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416 %! assert (new_fmt.description, ori_fmt.description); |
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imformats.m: add tests and fix bug when adding new formats.
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417 |
18297
1589b2fc74ae
imformats.m: add test for updating a format with invalid struct.
Carnë Draug <carandraug@octave.org>
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418 ## updating to an invalid format should cause an error |
1589b2fc74ae
imformats.m: add test for updating a format with invalid struct.
Carnë Draug <carandraug@octave.org>
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419 %!testif HAVE_MAGICK |
1589b2fc74ae
imformats.m: add test for updating a format with invalid struct.
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420 %! fmt = imformats ("jpg"); |
1589b2fc74ae
imformats.m: add test for updating a format with invalid struct.
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421 %! fmt = rmfield (fmt, "read"); |
1589b2fc74ae
imformats.m: add test for updating a format with invalid struct.
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422 %! error_thrown = false; |
1589b2fc74ae
imformats.m: add test for updating a format with invalid struct.
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423 %! try |
1589b2fc74ae
imformats.m: add test for updating a format with invalid struct.
Carnë Draug <carandraug@octave.org>
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424 %! imformats ("update", "jpg", fmt); |
1589b2fc74ae
imformats.m: add test for updating a format with invalid struct.
Carnë Draug <carandraug@octave.org>
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425 %! catch |
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imformats.m: add test for updating a format with invalid struct.
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426 %! error_thrown = true; |
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imformats.m: add test for updating a format with invalid struct.
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427 %! end_try_catch |
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imformats.m: add test for updating a format with invalid struct.
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428 %! assert (error_thrown, true); |