def request_resource(self, url, **kwargs):
maxwidth = kwargs.get('maxwidth', None)
maxheight = kwargs.get('maxheight', None)
# calculate the appropriate bounds for width and height
w, h = size_to_nearest(maxwidth, maxheight, self.IMAGE_SIZES, True)
# get the path, i.e. /media/img/kitties.jpg
image_path = re.match(self.regex, url).groups()[0]
# create the entire url as it would be on site, minus the filename
base_url, ext = url.rsplit('.', 1)
# create the file path minus the extension
base_path, ext = image_path.rsplit('.', 1)
append = '_%sx%s.%s' % (w, h, ext)
new_path = '%s%s' % (base_path, append)
if not default_storage.exists(new_path):
# open the original to calculate its width and height
source_file = default_storage.open(image_path)
img = Image.open(source_file)
# retrieve image format and dimensions
format = img.format
img_width, img_height = img.size
# do the math-y parts
new_width, new_height = scale(img_width, img_height, w, h)
img = img.resize((new_width, new_height), Image.ANTIALIAS)
img_buffer = StringIO()
img.MAXBLOCK = 1024 * 1024
img.save(img_buffer, format=format)
source_file.close()
default_storage.save(new_path, ContentFile(img_buffer.getvalue()))
new_url = '%s%s' % (base_url, append)
# get just the filename, i.e. test.jpg - used for generated the title
# of the returned oembed resource
image_filename = image_path.rsplit('/', 1)[-1]
data = {
'type': 'photo',
'provider_name': '',
'version': '1.0',
'width': w,
'height': h,
'title': image_filename,
'url': new_url,
'author_name': '',
'author_url': ''
}
return OEmbedResource.create(data)
def request_resource(self, url, **kwargs):
maxwidth = kwargs.get('maxwidth', None)
maxheight = kwargs.get('maxheight', None)
# calculate the appropriate bounds for width and height
w, h = size_to_nearest(maxwidth, maxheight, self.IMAGE_SIZES, True)
# get the path, i.e. /media/img/kitties.jpg
image_path = re.match(self.regex, url).groups()[0]
# create the entire filename as it would be on disk
filename = settings.MEDIA_ROOT + image_path
# create the entire url as it would be on site, minus the filename
base_url, ext = url.rsplit('.', 1)
# create the file path on disk minus the extension
base_file, ext = filename.rsplit('.', 1)
append = '_%sx%s.%s' % (w, h, ext)
new_filename = '%s%s' % (base_file, append)
if not os.path.isfile(new_filename):
# open the original to calculate its width and height
img = Image.open(filename)
img_width, img_height = img.size
# do the math-y parts
new_width, new_height = scale(img_width, img_height, w, h)
img = img.resize((new_width, new_height), Image.ANTIALIAS)
img.save(new_filename)
new_url = '%s%s' % (base_url, append)
# get just the filename, i.e. test.jpg - used for generated the title
# of the returned oembed resource
image_filename = image_path.rsplit('/', 1)[1]
data = {
'type': 'photo',
'provider_name': '',
'version': '1.0',
'width': w,
'height': h,
'title': image_filename,
'url': new_url,
'author_name': '',
'author_url': ''
}
return OEmbedResource.create(data)
def request_resource(self, url, **kwargs):
maxwidth = kwargs.get('maxwidth', None)
maxheight = kwargs.get('maxheight', None)
# calculate the appropriate bounds for width and height
w, h = size_to_nearest(maxwidth, maxheight, self.IMAGE_SIZES, True)
# get the path, i.e. /media/img/kitties.jpg
image_path = re.match(self.regex, url).groups()[0]
# create the entire url as it would be on site, minus the filename
base_url, ext = url.rsplit('.', 1)
# create the file path minus the extension
base_path, ext = image_path.rsplit('.', 1)
append = '_%sx%s.%s' % (w, h, ext)
new_path = '%s%s' % (base_path, append)
if not default_storage.exists(new_path):
# open the original to calculate its width and height
source_file = default_storage.open(image_path)
img = Image.open(source_file)
# retrieve image format and dimensions
format = img.format
img_width, img_height = img.size
# do the math-y parts
new_width, new_height = scale(img_width, img_height, w, h)
img = img.resize((new_width, new_height), Image.ANTIALIAS)
img_buffer = StringIO()
img.MAXBLOCK = 1024*1024
img.save(img_buffer, format=format)
source_file.close()
default_storage.save(new_path, ContentFile(img_buffer.getvalue()))
new_url = '%s%s' % (base_url, append)
# get just the filename, i.e. test.jpg - used for generated the title
# of the returned oembed resource
image_filename = image_path.rsplit('/', 1)[-1]
data = {'type': 'photo', 'provider_name': '', 'version': '1.0',
'width': w, 'height': h, 'title': image_filename,
'url': new_url, 'author_name': '', 'author_url': ''}
return OEmbedResource.create(data)
def test_scale(self):
self.assertEqual(scale(640, 480, 320), (320, 240))
self.assertEqual(scale(640, 480, 500, 240), (320, 240))
self.assertEqual(scale(640, 480, 320, 500), (320, 240))
self.assertEqual(scale(640, 480, 320, 240), (320, 240))
self.assertEqual(scale(640, 480, 700), (640, 480))
self.assertEqual(scale(640, 480, 700, 500), (640, 480))
def test_scale(self):
self.assertEqual(scale(640, 480, 320), (320, 240))
self.assertEqual(scale(640, 480, 500, 240), (320, 240))
self.assertEqual(scale(640, 480, 320, 500), (320, 240))
self.assertEqual(scale(640, 480, 320, 240), (320, 240))
self.assertEqual(scale(640, 480, 700), (640, 480))
self.assertEqual(scale(640, 480, 700, 500), (640, 480))
def resize(self, image_field, new_width=None, new_height=None):
"""
Resize an image to the 'best fit' width & height, maintaining
the scale of the image, so a 500x500 image sized to 300x400
will actually be scaled to 300x300.
Params:
image: ImageFieldFile to be resized (i.e. model.image_field)
new_width & new_height: desired maximums for resizing
Returns:
the url to the new image and the new width & height
(http://path-to-new-image, 300, 300)
"""
if not isinstance(image_field, ImageFieldFile):
raise ValueError(
'image_field must be an instance of django.db.models.fields.files.ImageFieldFile'
)
if image_field.field.width_field and image_field.field.height_field:
# use model fields
current_width = getattr(image_field.instance,
image_field.field.width_field)
current_height = getattr(image_field.instance,
image_field.field.height_field)
else:
# use PIL
try:
file_obj = storage.default_storage.open(image_field.name, 'rb')
img_obj = Image.open(file_obj)
current_width, current_height = img_obj.size
except IOError:
return (image_field.url, 0, 0)
# determine if resizing needs to be done (will not scale up)
if current_width < new_width:
if not new_height or current_height < new_height:
return (image_field.url, current_width, current_height)
# calculate ratios
new_width, new_height = scale(current_width, current_height, new_width,
new_height)
# use the image_processor defined in the settings, or PIL by default
return self._meta.image_processor.resize(image_field, new_width,
new_height)
def request_resource(self, url, **kwargs):
maxwidth = kwargs.get('maxwidth', None)
maxheight = kwargs.get('maxheight', None)
# calculate the appropriate bounds for width and height
w, h = size_to_nearest(maxwidth, maxheight, self.IMAGE_SIZES, True)
# get the path, i.e. /media/img/kitties.jpg
image_path = re.match(self.regex, url).groups()[0]
# create the entire filename as it would be on disk
filename = settings.MEDIA_ROOT + image_path
# create the entire url as it would be on site, minus the filename
base_url, ext = url.rsplit('.', 1)
# create the file path on disk minus the extension
base_file, ext = filename.rsplit('.', 1)
append = '_%sx%s.%s' % (w, h, ext)
new_filename = '%s%s' % (base_file, append)
if not os.path.isfile(new_filename):
# open the original to calculate its width and height
img = Image.open(filename)
img_width, img_height = img.size
# do the math-y parts
new_width, new_height = scale(img_width, img_height, w, h)
img = img.resize((new_width, new_height), Image.ANTIALIAS)
img.save(new_filename)
new_url = '%s%s' % (base_url, append)
# get just the filename, i.e. test.jpg - used for generated the title
# of the returned oembed resource
image_filename = image_path.rsplit('/', 1)[1]
data = {'type': 'photo', 'provider_name': '', 'version': '1.0',
'width': w, 'height': h, 'title': image_filename,
'url': new_url, 'author_name': '', 'author_url': ''}
return OEmbedResource.create(data)
def resize(self, image_field, new_width=None, new_height=None):
"""
Resize an image to the 'best fit' width & height, maintaining
the scale of the image, so a 500x500 image sized to 300x400
will actually be scaled to 300x300.
Params:
image: ImageFieldFile to be resized (i.e. model.image_field)
new_width & new_height: desired maximums for resizing
Returns:
the url to the new image and the new width & height
(http://path-to-new-image, 300, 300)
"""
if not isinstance(image_field, ImageFieldFile):
raise ValueError('image_field must be an instance of django.db.models.fields.files.ImageFieldFile')
if image_field.field.width_field and image_field.field.height_field:
# use model fields
current_width = getattr(image_field.instance, image_field.field.width_field)
current_height = getattr(image_field.instance, image_field.field.height_field)
else:
# use PIL
try:
file_obj = storage.default_storage.open(image_field.name, 'rb')
img_obj = Image.open(file_obj)
current_width, current_height = img_obj.size
except IOError:
return (image_field.url, 0, 0)
# determine if resizing needs to be done (will not scale up)
if current_width < new_width:
if not new_height or current_height < new_height:
return (image_field.url, current_width, current_height)
# calculate ratios
new_width, new_height = scale(current_width, current_height, new_width, new_height)
# use the image_processor defined in the settings, or PIL by default
return self._meta.image_processor.resize(image_field, new_width, new_height)
