84 lines
2.8 KiB
Python
84 lines
2.8 KiB
Python
"""
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The photo module contains the :class:`Photo` class, which is used to track
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image objects (JPG, DNG, etc.).
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.. moduleauthor:: Jaisen Mathai <jaisen@jmathai.com>
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"""
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import imghdr
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import os
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import time
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from .media import Media
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class Photo(Media):
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"""A photo object.
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:param str source: The fully qualified path to the photo file
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"""
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__name__ = 'Photo'
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#: Valid extensions for photo files.
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extensions = ('arw', 'cr2', 'dng', 'gif', 'heic', 'jpeg', 'jpg', 'nef', 'png', 'rw2')
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def __init__(self, source=None):
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super().__init__(source)
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# We only want to parse EXIF once so we store it here
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self.exif = None
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# Optionally import Pillow - see gh-325
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# https://github.com/jmathai/elodie/issues/325
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self.pillow = None
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try:
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from PIL import Image
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self.pillow = Image
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except ImportError:
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pass
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def is_valid(self):
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"""Check the file extension against valid file extensions.
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The list of valid file extensions come from self.extensions. This
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also checks whether the file is an image.
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:returns: bool
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"""
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source = self.source
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# HEIC is not well supported yet so we special case it.
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# https://github.com/python-pillow/Pillow/issues/2806
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extension = os.path.splitext(source)[1][1:].lower()
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if(extension != 'heic'):
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# gh-4 This checks if the source file is an image.
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# It doesn't validate against the list of supported types.
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# We check with imghdr and pillow.
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if(imghdr.what(source) is None):
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# Pillow is used as a fallback and if it's not available we trust
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# what imghdr returned.
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if(self.pillow is None):
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return False
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else:
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# imghdr won't detect all variants of images (https://bugs.python.org/issue28591)
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# see https://github.com/jmathai/elodie/issues/281
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# before giving up, we use `pillow` imaging library to detect file type
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#
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# It is important to note that the library doesn't decode or load the
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# raster data unless it really has to. When you open a file,
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# the file header is read to determine the file format and extract
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# things like mode, size, and other properties required to decode the file,
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# but the rest of the file is not processed until later.
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try:
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im = self.pillow.open(source)
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except IOError:
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return False
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if(im.format is None):
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return False
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return extension in self.extensions
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