Mercurial > libervia-backend

annotate sat/tools/images.py @ 3185:554b3b632378

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memory (cache): purge + pathlib: - cache is now purged on backend startup (every file which has passed EOL will be deleted) - use of pathlib, getPath now returns a Path
author Goffi <goffi@goffi.org>
date Wed, 26 Feb 2020 15:54:43 +0100
parents 8b4354b5c05f
children 5c3bf37f2202
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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)