Mercurial > libervia-backend

annotate sat/tools/images.py @ 3167:d0fb79f97466

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quick frontends (app): added an "ignore_missing" argument to RemoveListener: normally an error is logged when removeListener is call on a inexisting listener, but sometimes listeners are added only in specific scenarios, and it may be handy to try to delete them without having to explictly check that they have been used.
author Goffi <goffi@goffi.org>
date Wed, 12 Feb 2020 19:44:05 +0100
parents 8b4354b5c05f
children 5c3bf37f2202
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """Methods to manipulate images"""
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21
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22 import tempfile
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23 from PIL import Image
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24 from sat.core.constants import Const as C
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25 from pathlib import Path
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26 from twisted.internet import threads
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27
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28
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29 def checkImage(host, path, context=C.CONTEXT_CHAT):
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30 """Analyze image and return a report
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31
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32 report will indicate if image is too large, and the recommended new size if this is
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33 the case
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34 @param host: SàT instance
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35 @param path(str, pathlib.Path): image to open
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36 @param context(str): context in which the image is transfered
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37 @return dict: report on image, with following keys:
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38 - too_large: true if image is oversized
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39 - recommended_size: if too_large is True, recommended size to use
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40 """
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41 # TODO: context is not used yet
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42 report = {}
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43 image = Image.open(path)
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44 max_size = tuple(host.memory.getConfig(None, "image_max", (1200, 720)))
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45 if image.size > max_size:
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46 report['too_large'] = True
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47 if image.size[0] > max_size[0]:
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48 factor = max_size[0] / image.size[0]
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49 if image.size[1] * factor > max_size[1]:
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50 factor = max_size[1] / image.size[1]
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51 else:
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52 factor = max_size[1] / image.size[1]
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53 report['recommended_size'] = [int(image.width*factor), int(image.height*factor)]
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54 else:
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55 report['too_large'] = False
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56
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57 return report
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58
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59
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60 def _resizeImageBlocking(image_path, new_size):
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61 im_path = Path(image_path)
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62 im = Image.open(im_path)
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63 resized = im.resize(new_size, Image.LANCZOS)
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64 with tempfile.NamedTemporaryFile(suffix=im_path.suffix, delete=False) as f:
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65 resized.save(f, format=im.format)
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66 return Path(f.name)
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67
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68
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69 def resizeImage(image_path, new_size):
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70 """Resize an image to a new temporary file, and return it path
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71
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72 @param image_path(str, Path): path of the original image
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73 @param new_size(tuple[int, int]): size to use for new image
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74 @return (Path): path of the resized file. The image at this path must be deleted
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75 after use
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76 """
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77 return threads.deferToThread(_resizeImageBlocking, image_path, new_size)