Mercurial > libervia-backend

annotate sat/tools/images.py @ 3118:02492db1ce39

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quick frontend (app): call `getReady` once connected to bridge: namespaces and encryption plugins are only retrieved once backend is ready, else they may not yet be available (can happen notably when the backend is start at the same time as the frontend, e.g. on Android).
author Goffi <goffi@goffi.org>
date Sat, 25 Jan 2020 21:08:26 +0100
parents 2cc2f65379f7
children 9d0df638c8b4
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3066
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1 #!/usr/bin/env python3
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2019 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'] = [image.width*factor, 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)