Mercurial > libervia-desktop-kivy

annotate cagou/core/image.py @ 460:b5e8e470f7f7

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core (image): convert SVG images + better error handling: - when an SVG image is found, new backend `imageConvert` method is used to convert it to PNG - by default, 128x128 is used as dest size. - removed code to handle image without extension in filename, as it is now working with Kivy. - if texture is not updated after `texture_update` is called, an error is logged, a fallback image is used, and `on_error` event is dispatched
author Goffi <goffi@goffi.org>
date Sun, 19 Apr 2020 17:06:57 +0200
parents aa204c813f07
children 3c9ba4a694ef
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1 #!/usr/bin/env python3
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4 # Cagou: desktop/mobile frontend for Salut à Toi XMPP client
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5 # Copyright (C) 2016-2020 Jérôme Poisson (goffi@goffi.org)
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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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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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21 import mimetypes
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22 from functools import partial
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23 from kivy.uix import image as kivy_img
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24 from sat.core import log as logging
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25 from sat.tools.common import data_format
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26 from cagou import G
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28 log = logging.getLogger(__name__)
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31 class Image(kivy_img.Image):
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32 """Image widget which accept source without extension"""
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33 SVG_CONVERT_EXTRA = {'width': 128, 'height': 128}
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34
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35 def __init__(self, **kwargs):
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36 self.register_event_type('on_error')
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37 super().__init__(**kwargs)
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38
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39 def _imageConvertCb(self, path):
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40 self.source = path
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42 def texture_update(self, *largs):
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43 if self.source:
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44 if mimetypes.guess_type(self.source, strict=False)[0] == 'image/svg+xml':
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45 log.debug(f"Converting SVG image at {self.source} to PNG")
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46 G.host.bridge.imageConvert(
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47 self.source,
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48 "",
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49 data_format.serialise(self.SVG_CONVERT_EXTRA),
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50 "",
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51 callback=self._imageConvertCb,
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52 errback=partial(
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53 G.host.errback,
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54 message=f"Can't load image at {self.source}: {{msg}}"
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55 )
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56 )
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57 return
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59 super().texture_update(*largs)
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60 if self.source and self.texture is None:
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61 log.warning(
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62 f"Image {self.source} has not been imported correctly, replacing by "
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63 f"empty one")
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64 # FIXME: temporary image, to be replaced by something showing that something
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65 # went wrong
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66 self.source = G.host.app.expand(
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67 "{media}/misc/borders/border_hollow_black.png")
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68 self.dispatch('on_error', Exception(f"Can't load source {self.source}"))
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70 def on_error(self, err):
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71 pass
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74 class AsyncImage(kivy_img.AsyncImage):
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75 """AsyncImage which accept file:// schema"""
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77 def _load_source(self, *args):
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78 if self.source.startswith('file://'):
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79 self.source = self.source[7:]
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80 else:
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81 super(AsyncImage, self)._load_source(*args)