def process(self, descriptor: StreamDescriptor, context: dict):
# Ensuring the wand package is installed.
ensure_wand()
# noinspection PyPackageRequirements
from wand.image import Image as WandImage
# Copy the original info
# generating thumbnail and storing in buffer
# noinspection PyTypeChecker
img = WandImage(file=descriptor)
if self.crop is None and (
self.format is None or img.format == self.format) and (
(self.width is None or img.width == self.width) and
(self.height is None or img.height == self.height)):
img.close()
descriptor.prepare_to_read(backend='memory')
return
if 'length' in context:
del context['length']
# opening the original file
output_buffer = io.BytesIO()
with img:
# Changing format if required.
if self.format and img.format != self.format:
img.format = self.format
# Changing dimension if required.
if self.width or self.height:
width, height, _ = validate_width_height_ratio(
self.width, self.height, None)
img.resize(
width(img.size) if callable(width) else width,
height(img.size) if callable(height) else height)
# Cropping
if self.crop:
img.crop(
**{
key: int(
int(value[:-1]) / 100 *
(img.width if key in ('width', 'left',
'right') else img.height)
) if key in ('left', 'top', 'right', 'bottom', 'width',
'height') and '%' in value else value
for key, value in self.crop.items()
})
img.save(file=output_buffer)
context.update(content_type=img.mimetype,
width=img.width,
height=img.height,
extension=guess_extension(img.mimetype))
output_buffer.seek(0)
descriptor.replace(output_buffer, position=0, **context)
def process(self, descriptor: StreamDescriptor, context: dict):
Image = get_image_factory()
# This processor requires seekable stream.
descriptor.prepare_to_read(backend='memory')
with Image(file=descriptor) as img:
context.update(width=img.width,
height=img.height,
content_type=img.mimetype)
# prepare for next processor, calling this method is not bad and just uses the memory
# temporary.
descriptor.prepare_to_read(backend='memory')
def process(self, descriptor: StreamDescriptor, context: dict):
ensure_wand()
# noinspection PyPackageRequirements
from wand.image import Image as WandImage
# This processor requires seekable stream.
descriptor.prepare_to_read(backend='memory')
with WandImage(file=descriptor) as img:
context.update(width=img.width,
height=img.height,
content_type=img.mimetype)
# prepare for next processor, calling this method is not bad.
descriptor.prepare_to_read(backend='memory')
def process(self, descriptor: StreamDescriptor, context: dict):
ensure_wand()
# noinspection PyPackageRequirements
from wand.image import Image as WandImage
from wand.exceptions import WandException
# This processor requires seekable stream.
descriptor.prepare_to_read(backend='memory')
try:
# noinspection PyUnresolvedReferences
with WandImage(file=descriptor) as img:
context.update(width=img.width,
height=img.height,
content_type=img.mimetype)
except WandException:
raise AnalyzeError(str(WandException))
# prepare for next processor, calling this method is not bad.
descriptor.prepare_to_read(backend='memory')
def process(self, descriptor: StreamDescriptor, context: dict):
context.update(content_type=magic_mime_from_buffer(
descriptor.get_header_buffer()))