def get_thumbnail(original, size, **options):
"""
Creates or gets an already created thumbnail for the given image with the given size and
options.
:param original: File-path, url or base64-encoded string of the image that you want an
thumbnail.
:param size: String with the wanted thumbnail size. On the form: ``200x200``, ``200`` or
``x200``.
:param crop: Crop settings, should be ``center``, ``top``, ``right``, ``bottom``, ``left``.
:param force: If set to ``True`` the thumbnail will be created even if it exists before.
:param quality: Overrides ``THUMBNAIL_QUALITY``, will set the quality used by the backend while
saving the thumbnail.
:param scale_up: Overrides ``THUMBNAIL_SCALE_UP``, if set to ``True`` the image will be scaled
up if necessary.
:param colormode: Overrides ``THUMBNAIL_COLORMODE``, The default colormode for thumbnails.
Supports all values supported by pillow. In other engines there is a best
effort translation from pillow modes to the modes supported by the current
engine.
:param format: Overrides the format the thumbnail will be saved in. This will override both the
detected file type as well as the one specified in ``THUMBNAIL_FALLBACK_FORMAT``.
:return: A Thumbnail object
"""
engine = get_engine()
cache = get_cache_backend()
original = SourceFile(original)
crop = options.get('crop', None)
options = engine.evaluate_options(options)
thumbnail_name = generate_filename(original, size, crop)
if settings.THUMBNAIL_DUMMY:
engine = DummyEngine()
return engine.get_thumbnail(thumbnail_name, engine.parse_size(size),
crop, options)
cached = cache.get(thumbnail_name)
force = options is not None and 'force' in options and options['force']
if not force and cached:
return cached
thumbnail = Thumbnail(thumbnail_name, engine.get_format(original, options))
if force or not thumbnail.exists:
size = engine.parse_size(size)
thumbnail.image = engine.get_thumbnail(original, size, crop, options)
thumbnail.save(options)
for resolution in settings.THUMBNAIL_ALTERNATIVE_RESOLUTIONS:
resolution_size = engine.calculate_alternative_resolution_size(
resolution, size)
image = engine.get_thumbnail(original, resolution_size, crop,
options)
thumbnail.save_alternative_resolution(resolution, image, options)
cache.set(thumbnail)
return thumbnail
def get_thumbnail(original, size, **options):
"""
Creates or gets an already created thumbnail for the given image with the given size and
options.
:param original: File-path, url or base64-encoded string of the image that you want an
thumbnail.
:param size: String with the wanted thumbnail size. On the form: ``200x200``, ``200`` or
``x200``.
:param crop: Crop settings, should be ``center``, ``top``, ``right``, ``bottom``, ``left``.
:param force: If set to ``True`` the thumbnail will be created even if it exists before.
:param quality: Overrides ``THUMBNAIL_QUALITY``, will set the quality used by the backend while
saving the thumbnail.
:param scale_up: Overrides ``THUMBNAIL_SCALE_UP``, if set to ``True`` the image will be scaled
up if necessary.
:param colormode: Overrides ``THUMBNAIL_COLORMODE``, The default colormode for thumbnails.
Supports all values supported by pillow. In other engines there is a best
effort translation from pillow modes to the modes supported by the current
engine.
:param format: Overrides the format the thumbnail will be saved in. This will override both the
detected file type as well as the one specified in ``THUMBNAIL_FALLBACK_FORMAT``.
:return: A Thumbnail object
"""
engine = get_engine()
cache = get_cache_backend()
original = SourceFile(original)
crop = options.get('crop', None)
thumbnail_name = generate_filename(original, size, crop, options)
if settings.THUMBNAIL_DUMMY:
engine = DummyEngine()
return engine.get_thumbnail(thumbnail_name, engine.parse_size(size), crop, options)
cached = cache.get(thumbnail_name)
force = options is not None and 'force' in options and options['force']
if not force and cached:
return cached
thumbnail = Thumbnail(thumbnail_name)
if force or not thumbnail.exists:
options = engine.evaluate_options(options)
size = engine.parse_size(size)
thumbnail.image = engine.get_thumbnail(original, size, crop, options)
thumbnail.save(options)
for resolution in settings.THUMBNAIL_ALTERNATIVE_RESOLUTIONS:
resolution_size = engine.calculate_alternative_resolution_size(resolution, size)
image = engine.get_thumbnail(original, resolution_size, crop, options)
thumbnail.save_alternative_resolution(resolution, image, options)
cache.set(thumbnail)
return thumbnail
def setUp(self):
self.instance = Thumbnail(['n', 'ame'])
self.instance.size = 200, 400
def test_exists(self, mock_exists):
self.instance = Thumbnail(['name'])
self.assertTrue(self.instance.exists)
mock_exists.assert_called_with(self.instance.path)
def create(self, original, size, crop, options=None):
thumbnail = Thumbnail('dummy_{}x{}'.format(size[0], size[1]), 'jpg')
thumbnail.size = size
thumbnail._url = self._get_url(size)
return thumbnail
def test_set_calls_backend_specific_set(self, mock__set):
thumbnail = Thumbnail(['hi', 'there'], 'jpg')
self.backend.set(thumbnail)
mock__set.assert_has_calls([mock.call('hi/there', thumbnail)])
def test_set_and_get(self):
thumbnail = Thumbnail(['n', 'ame'], 'jpg')
self.backend.set(thumbnail)
cached_thumbnail = self.backend.get(thumbnail.name)
self.assertIsInstance(cached_thumbnail, Thumbnail)
self.assertEqual(cached_thumbnail.name, thumbnail.name)
def create(self, original, size, crop, options=None):
thumbnail = Thumbnail('dummy_{}x{}'.format(size[0], size[1]))
thumbnail.size = size
thumbnail._url = self._get_url(size)
return thumbnail
def create_thumbnail_object(name):
return Thumbnail(name)