mirror of
https://expo.survex.com/repositories/troggle/.git
synced 2024-11-27 01:31:57 +00:00
c45eb31e8f
Copied from http://cucc@cucc.survex.com/svn/trunk/expoweb/troggle/, rev. 8338 by cucc @ 5/11/2009 3:08 AM
120 lines
3.4 KiB
Python
120 lines
3.4 KiB
Python
""" ImageKit image specifications
|
|
|
|
All imagekit specifications must inherit from the ImageSpec class. Models
|
|
inheriting from ImageModel will be modified with a descriptor/accessor for each
|
|
spec found.
|
|
|
|
"""
|
|
import os
|
|
from StringIO import StringIO
|
|
from imagekit.lib import *
|
|
from imagekit.utils import img_to_fobj
|
|
from django.core.files.base import ContentFile
|
|
|
|
class ImageSpec(object):
|
|
pre_cache = False
|
|
quality = 70
|
|
increment_count = False
|
|
processors = []
|
|
|
|
@classmethod
|
|
def name(cls):
|
|
return getattr(cls, 'access_as', cls.__name__.lower())
|
|
|
|
@classmethod
|
|
def process(cls, image, obj):
|
|
processed_image = image.copy()
|
|
for proc in cls.processors:
|
|
processed_image = proc.process(processed_image, obj)
|
|
return processed_image
|
|
|
|
|
|
class Accessor(object):
|
|
def __init__(self, obj, spec):
|
|
self._img = None
|
|
self._obj = obj
|
|
self.spec = spec
|
|
|
|
def _get_imgfile(self):
|
|
format = self._img.format or 'JPEG'
|
|
if format != 'JPEG':
|
|
imgfile = img_to_fobj(self._img, format)
|
|
else:
|
|
imgfile = img_to_fobj(self._img, format,
|
|
quality=int(self.spec.quality),
|
|
optimize=True)
|
|
return imgfile
|
|
|
|
def _create(self):
|
|
if self._exists():
|
|
return
|
|
# process the original image file
|
|
fp = self._obj._imgfield.storage.open(self._obj._imgfield.name)
|
|
fp.seek(0)
|
|
fp = StringIO(fp.read())
|
|
try:
|
|
self._img = self.spec.process(Image.open(fp), self._obj)
|
|
# save the new image to the cache
|
|
content = ContentFile(self._get_imgfile().read())
|
|
self._obj._imgfield.storage.save(self.name, content)
|
|
except IOError:
|
|
pass
|
|
|
|
def _delete(self):
|
|
self._obj._imgfield.storage.delete(self.name)
|
|
|
|
def _exists(self):
|
|
return self._obj._imgfield.storage.exists(self.name)
|
|
|
|
def _basename(self):
|
|
filename, extension = \
|
|
os.path.splitext(os.path.basename(self._obj._imgfield.name))
|
|
return self._obj._ik.cache_filename_format % \
|
|
{'filename': filename,
|
|
'specname': self.spec.name(),
|
|
'extension': extension.lstrip('.')}
|
|
|
|
@property
|
|
def name(self):
|
|
return os.path.join(self._obj._ik.cache_dir, self._basename())
|
|
|
|
@property
|
|
def url(self):
|
|
self._create()
|
|
if self.spec.increment_count:
|
|
fieldname = self._obj._ik.save_count_as
|
|
if fieldname is not None:
|
|
current_count = getattr(self._obj, fieldname)
|
|
setattr(self._obj, fieldname, current_count + 1)
|
|
self._obj.save(clear_cache=False)
|
|
return self._obj._imgfield.storage.url(self.name)
|
|
|
|
@property
|
|
def file(self):
|
|
self._create()
|
|
return self._obj._imgfield.storage.open(self.name)
|
|
|
|
@property
|
|
def image(self):
|
|
if self._img is None:
|
|
self._create()
|
|
if self._img is None:
|
|
self._img = Image.open(self.file)
|
|
return self._img
|
|
|
|
@property
|
|
def width(self):
|
|
return self.image.size[0]
|
|
|
|
@property
|
|
def height(self):
|
|
return self.image.size[1]
|
|
|
|
|
|
class Descriptor(object):
|
|
def __init__(self, spec):
|
|
self._spec = spec
|
|
|
|
def __get__(self, obj, type=None):
|
|
return Accessor(obj, self._spec)
|