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54 lines
2.0 KiB
Python
54 lines
2.0 KiB
Python
# Created By: Virgil Dupras
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# Created On: 2011-05-29
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# Copyright 2011 Hardcoded Software (http://www.hardcoded.net)
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#
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# This software is licensed under the "BSD" License as described in the "LICENSE" file,
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# which should be included with this package. The terms are also available at
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# http://www.hardcoded.net/licenses/bsd_license
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from hscommon import io
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from hscommon.util import get_file_ext
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from core import fs
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from . import exif
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class Photo(fs.File):
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INITIAL_INFO = fs.File.INITIAL_INFO.copy()
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INITIAL_INFO.update({
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'dimensions': (0,0),
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})
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# These extensions are supported on all platforms
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HANDLED_EXTS = {'png', 'jpg', 'jpeg', 'gif', 'bmp', 'tiff', 'tif'}
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def _plat_get_dimensions(self):
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raise NotImplementedError()
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def _plat_get_blocks(self, block_count_per_side, orientation):
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raise NotImplementedError()
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def _get_orientation(self):
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if not hasattr(self, '_cached_orientation'):
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try:
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with io.open(self.path, 'rb') as fp:
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exifdata = exif.get_fields(fp)
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# the value is a list (probably one-sized) of ints
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orientations = exifdata['Orientation']
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self._cached_orientation = orientations[0]
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except Exception: # Couldn't read EXIF data, no transforms
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self._cached_orientation = 0
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return self._cached_orientation
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@classmethod
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def can_handle(cls, path):
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return fs.File.can_handle(path) and get_file_ext(path[-1]) in cls.HANDLED_EXTS
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def _read_info(self, field):
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fs.File._read_info(self, field)
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if field == 'dimensions':
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self.dimensions = self._plat_get_dimensions()
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if self._get_orientation() in {5, 6, 7, 8}:
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self.dimensions = (self.dimensions[1], self.dimensions[0])
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def get_blocks(self, block_count_per_side):
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return self._plat_get_blocks(block_count_per_side, self._get_orientation())
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