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annotate sat/tools/image.py @ 3220:4fbea7f1e012

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tools (images): methods renaming
author Goffi <goffi@goffi.org>
date Sun, 22 Mar 2020 12:52:43 +0100
parents sat/tools/images.py@5c3bf37f2202
children 54934ee3f69c
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1 #!/usr/bin/env python3
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2
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3 # SàT: an XMPP client
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4 # Copyright (C) 2009-2020 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 from PIL import Image
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23 from pathlib import Path
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24 from twisted.internet import threads
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25
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26
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27 def check(host, path, max_size=None):
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28 """Analyze image and return a report
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29
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30 report will indicate if image is too large, and the recommended new size if this is
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31 the case
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32 @param host: SàT instance
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33 @param path(str, pathlib.Path): image to open
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34 @param max_size(tuple[int, int]): maximum accepted size of image
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35 None to use value set in config
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36 @return dict: report on image, with following keys:
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37 - too_large: true if image is oversized
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38 - recommended_size: if too_large is True, recommended size to use
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39 """
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40 report = {}
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41 image = Image.open(path)
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42 if max_size is None:
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43 max_size = tuple(host.memory.getConfig(None, "image_max", (1200, 720)))
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44 if image.size > max_size:
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45 report['too_large'] = True
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46 if image.size[0] > max_size[0]:
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47 factor = max_size[0] / image.size[0]
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48 if image.size[1] * factor > max_size[1]:
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49 factor = max_size[1] / image.size[1]
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50 else:
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51 factor = max_size[1] / image.size[1]
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52 report['recommended_size'] = [int(image.width*factor), int(image.height*factor)]
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53 else:
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54 report['too_large'] = False
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55
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56 return report
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57
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58
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59 def _resizeBlocking(image_path, new_size, dest=None):
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60 im_path = Path(image_path)
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61 im = Image.open(im_path)
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62 resized = im.resize(new_size, Image.LANCZOS)
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63
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64 if dest is None:
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65 dest = tempfile.NamedTemporaryFile(suffix=im_path.suffix, delete=False)
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66 elif isinstance(dest, Path):
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67 dest = dest.open('wb')
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68
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69 with dest as f:
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70 resized.save(f, format=im.format)
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71
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72 return Path(f.name)
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73
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74
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75 def resize(image_path, new_size, dest=None):
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76 """Resize an image to a new file, and return its path
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77
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78 @param image_path(str, Path): path of the original image
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79 @param new_size(tuple[int, int]): size to use for new image
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80 @param dest(None, Path, file): where the resized image must be stored, can be:
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81 - None: use a temporary file
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82 - Path: path to the file to create/overwrite
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83 - file: a file object which must be opened for writing in binary mode
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84 @return (Path): path of the resized file.
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85 The image at this path should be deleted after use
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86 """
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87 return threads.deferToThread(_resizeBlocking, image_path, new_size, dest)