mirror of
https://github.com/Hopiu/django-imagekit.git
synced 2026-03-17 05:40:25 +00:00
134 lines
3.1 KiB
Python
134 lines
3.1 KiB
Python
import tempfile
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import types
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from django.utils.functional import wraps
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from imagekit.lib import Image
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def img_to_fobj(img, format, **kwargs):
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tmp = tempfile.TemporaryFile()
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# Preserve transparency if the image is in Pallette (P) mode.
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transparency_formats = ('PNG', 'GIF', )
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if img.mode == 'P' and format in transparency_formats:
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kwargs['transparency'] = len(img.split()[-1].getcolors())
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else:
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img = img.convert('RGB')
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img.save(tmp, format, **kwargs)
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tmp.seek(0)
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return tmp
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def get_spec_files(instance):
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try:
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ik = getattr(instance, '_ik')
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except AttributeError:
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return []
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else:
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return [getattr(instance, n) for n in ik.spec_file_names]
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def open_image(target):
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img = Image.open(target)
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img.copy = types.MethodType(_wrap_copy(img.copy), img, img.__class__)
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return img
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def _wrap_copy(f):
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@wraps(f)
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def copy(self):
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img = f()
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try:
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img.app = self.app
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except AttributeError:
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pass
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try:
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img._getexif = self._getexif
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except AttributeError:
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pass
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return img
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return copy
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class UnknownExtensionError(Exception):
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pass
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class UnknownFormatError(Exception):
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pass
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_pil_init = 0
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def _preinit_pil():
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"""Loads the standard PIL file format drivers. Returns True if ``preinit()``
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was called (and there's a potential that more drivers were loaded) or False
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if there is no possibility that new drivers were loaded.
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"""
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global _pil_init
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if _pil_init < 1:
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Image.preinit()
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_pil_init = 1
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return True
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return False
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def _init_pil():
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"""Loads all PIL file format drivers. Returns True if ``init()`` was called
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(and there's a potential that more drivers were loaded) or False if there is
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no possibility that new drivers were loaded.
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"""
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global _pil_init
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_preinit_pil()
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if _pil_init < 2:
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Image.init()
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_pil_init = 2
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return True
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return False
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def _extension_to_format(extension):
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return Image.EXTENSION.get(extension.lower())
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def _format_to_extension(format):
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if format:
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for k, v in Image.EXTENSION.iteritems():
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if v == format.upper():
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return k
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return None
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def extension_to_format(extension):
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"""Returns the format that corresponds to the provided extension.
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"""
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format = _extension_to_format(extension)
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if not format and _preinit_pil():
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format = _extension_to_format(extension)
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if not format and _init_pil():
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format = _extension_to_format(extension)
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if not format:
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raise UnknownExtensionError(extension)
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return format
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def format_to_extension(format):
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"""Returns the first extension that matches the provided format.
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"""
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extension = None
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if format:
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extension = _format_to_extension(format)
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if not extension and _preinit_pil():
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extension = _format_to_extension(format)
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if not extension and _init_pil():
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extension = _format_to_extension(format)
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if not extension:
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raise UnknownFormatError(format)
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return extension
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