Mercurial > libervia-backend

annotate sat/tools/image.py @ 3632:7acf19bdca2f

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doc: minor typo
author Goffi <goffi@goffi.org>
date Fri, 27 Aug 2021 14:59:47 +0200
parents 7550ae9cfbac
children 524856bd7b19
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1 #!/usr/bin/env python3
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2
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3 # Libervia: an XMPP client
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4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 """Methods to manipulate images"""
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20
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21 import tempfile
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22 import mimetypes
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23 from PIL import Image, ImageOps
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24 from pathlib import Path
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25 from twisted.internet import threads
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26 from sat.core.i18n import _
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27 from sat.core import exceptions
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28 from sat.core.log import getLogger
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29
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30 log = getLogger(__name__)
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31
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32 try:
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33 import cairosvg
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34 except Exception as e:
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35 log.warning(_("SVG support not available, please install cairosvg: {e}").format(
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36 e=e))
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37 cairosvg = None
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38
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39
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40 def check(host, path, max_size=None):
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41 """Analyze image and return a report
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42
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43 report will indicate if image is too large, and the recommended new size if this is
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44 the case
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45 @param host: SàT instance
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46 @param path(str, pathlib.Path): image to open
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47 @param max_size(tuple[int, int]): maximum accepted size of image
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48 None to use value set in config
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49 @return dict: report on image, with following keys:
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50 - too_large: true if image is oversized
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51 - recommended_size: if too_large is True, recommended size to use
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52 """
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53 report = {}
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54 image = Image.open(path)
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55 if max_size is None:
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56 max_size = tuple(host.memory.getConfig(None, "image_max", (1200, 720)))
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57 if image.size > max_size:
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58 report['too_large'] = True
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59 if image.size[0] > max_size[0]:
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60 factor = max_size[0] / image.size[0]
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61 if image.size[1] * factor > max_size[1]:
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62 factor = max_size[1] / image.size[1]
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63 else:
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64 factor = max_size[1] / image.size[1]
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65 report['recommended_size'] = [int(image.width*factor), int(image.height*factor)]
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66 else:
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67 report['too_large'] = False
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68
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69 return report
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70
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71
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72 def _resize_blocking(image_path, new_size, dest, fix_orientation):
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73 im_path = Path(image_path)
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74 im = Image.open(im_path)
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75 resized = im.resize(new_size, Image.LANCZOS)
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76 if fix_orientation:
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77 resized = ImageOps.exif_transpose(resized)
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78
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79 if dest is None:
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80 dest = tempfile.NamedTemporaryFile(suffix=im_path.suffix, delete=False)
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81 elif isinstance(dest, Path):
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82 dest = dest.open('wb')
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83
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84 with dest as f:
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85 resized.save(f, format=im.format)
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86
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87 return Path(f.name)
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88
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89
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90 def resize(image_path, new_size, dest=None, fix_orientation=True):
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91 """Resize an image to a new file, and return its path
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92
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93 @param image_path(str, Path): path of the original image
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94 @param new_size(tuple[int, int]): size to use for new image
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95 @param dest(None, Path, file): where the resized image must be stored, can be:
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96 - None: use a temporary file
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97 file will be converted to PNG
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98 - Path: path to the file to create/overwrite
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99 - file: a file object which must be opened for writing in binary mode
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100 @param fix_orientation: if True, use EXIF data to set orientation
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101 @return (Path): path of the resized file.
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102 The image at this path should be deleted after use
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103 """
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104 return threads.deferToThread(
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105 _resize_blocking, image_path, new_size, dest, fix_orientation)
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106
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107
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108 def _convert_blocking(image_path, dest, extra):
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109 media_type = mimetypes.guess_type(str(image_path), strict=False)[0]
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110
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111 if dest is None:
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112 dest = tempfile.NamedTemporaryFile(suffix=".png", delete=False)
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113 filepath = Path(dest.name)
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114 elif isinstance(dest, Path):
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115 filepath = dest
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116 else:
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117 # we should have a file-like object
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118 try:
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119 name = dest.name
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120 except AttributeError:
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121 name = None
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122 if name:
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123 try:
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124 filepath = Path(name)
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125 except TypeError:
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126 filepath = Path('noname.png')
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127 else:
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128 filepath = Path('noname.png')
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129
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130 if media_type == "image/svg+xml":
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131 if cairosvg is None:
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Goffi <goffi@goffi.org>
parents: 3252
diff changeset
132 raise exceptions.MissingModule(
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
133 f"Can't convert SVG image at {image_path} due to missing CairoSVG module")
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
134 width, height = extra.get('width'), extra.get('height')
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
135 cairosvg.svg2png(
f300d78f08f3 core: image convertion + SVG support:
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parents: 3252
diff changeset
136 url=str(image_path), write_to=dest,
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
137 output_width=width, output_height=height
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
138 )
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
139 else:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
140 suffix = filepath.suffix
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
141 if not suffix:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
142 raise ValueError(
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
143 "A suffix is missing for destination, it is needed to determine file "
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
144 "format")
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
145 if not suffix in Image.EXTENSION:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
146 Image.init()
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
147 try:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
148 im_format = Image.EXTENSION[suffix]
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
149 except KeyError:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
150 raise ValueError(
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
151 "Dest image format can't be determined, {suffix!r} suffix is unknown"
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
152 )
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
153 im = Image.open(image_path)
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
154 im.save(dest, format=im_format)
f300d78f08f3 core: image convertion + SVG support:
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parents: 3252
diff changeset
155
f300d78f08f3 core: image convertion + SVG support:
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parents: 3252
diff changeset
156 log.debug(f"image {image_path} has been converted to {filepath}")
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
157 return filepath
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
158
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
159
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
160 def convert(image_path, dest=None, extra=None):
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parents: 3252
diff changeset
161 """Convert an image to a new file, and return its path
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
162
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
163 @param image_path(str, Path): path of the image to convert
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Goffi <goffi@goffi.org>
parents: 3252
diff changeset
164 @param dest(None, Path, file): where the converted image must be stored, can be:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
165 - None: use a temporary file
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
166 - Path: path to the file to create/overwrite
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
167 - file: a file object which must be opened for writing in binary mode
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
168 @param extra(None, dict): conversion options
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
169 if image_path link to a SVG file, following options can be used:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
170 - width: destination width
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
171 - height: destination height
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
172 @return (Path): path of the converted file.
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
173 a generic name is used if dest is an unnamed file like object
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
174 """
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
175 image_path = Path(image_path)
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
176 if not image_path.is_file():
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
177 raise ValueError(f"There is no file at {image_path}!")
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
178 if extra is None:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
179 extra = {}
3332
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
180 return threads.deferToThread(_convert_blocking, image_path, dest, extra)
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
181
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
182
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
183 def __fix_orientation_blocking(image_path):
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
184 im = Image.open(image_path)
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
185 im_format = im.format
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
186 exif = im.getexif()
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
187 orientation = exif.get(0x0112)
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
188 if orientation is None or orientation<2:
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
189 # nothing to do
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
190 return False
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
191 im = ImageOps.exif_transpose(im)
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
192 im.save(image_path, im_format)
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
193 log.debug(f"image {image_path} orientation has been fixed")
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
194 return True
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
195
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
196
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
197 def fix_orientation(image_path: Path) -> bool:
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
198 """Apply orientation found in EXIF data if any
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
199
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
200 @param image_path: image location, image will be modified in place
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
201 @return True if image has been modified
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
202 """
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
203 return threads.deferToThread(__fix_orientation_blocking, image_path)
3259
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
204
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
205
3252
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
206 def guess_type(source):
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
207 """Guess image media type
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
208
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
209 @param source(str, Path, file): image to guess type
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
210 @return (str, None): media type, or None if we can't guess
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
211 """
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
212 if isinstance(source, str):
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
213 source = Path(source)
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
214
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
215 if isinstance(source, Path):
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
216 # we first try to guess from file name
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
217 media_type = mimetypes.guess_type(source, strict=False)[0]
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
218 if media_type is not None:
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
219 return media_type
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
220
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
221 # file name is not enough, we try to open it
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
222 img = Image.open(source)
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
223 try:
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
224 return Image.MIME[img.format]
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
225 except KeyError:
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
226 return None