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-rw-r--r--bsie/reader/preview/_rawpy.py66
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+"""
+
+Part of the bsie module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# standard imports
+from functools import partial
+import typing
+
+# external imports
+import PIL.Image
+import rawpy
+
+# bsie imports
+from bsie.utils import errors, filematcher
+
+# inner-module imports
+from . import utils
+from .. import base
+
+# constants
+MATCH_RULE = 'mime={image/x-nikon-nef} | extension={nef}'
+
+# exports
+__all__: typing.Sequence[str] = (
+ 'RawpyPreviewReader',
+ )
+
+
+## code ##
+
+class RawpyPreviewReader(base.Reader):
+ """Produce previews for raw image files using the rawpy library."""
+
+ # file matcher
+ _match: filematcher.Matcher
+
+ # additional kwargs to rawpy's postprocess
+ _rawpy_kwargs: typing.Dict[str, typing.Any]
+
+ def __init__(self, **rawpy_kwargs):
+ match_rule = rawpy_kwargs.pop('file_match_rule', MATCH_RULE)
+ self._match = filematcher.parse(match_rule)
+ self._rawpy_kwargs = rawpy_kwargs
+
+ def __call__(self, path: str) -> typing.Callable[[int], PIL.Image.Image]:
+ # perform quick checks first
+ if not self._match(path):
+ raise errors.UnsupportedFileFormatError(path)
+
+ try:
+ # open file with rawpy
+ ary = rawpy.imread(path).postprocess(**self._rawpy_kwargs)
+ # convert to PIL.Image
+ img = PIL.Image.fromarray(ary)
+ # return callback
+ return partial(utils.resize, img)
+
+ except (rawpy.LibRawFatalError, # pylint: disable=no-member # pylint doesn't find the errors
+ rawpy.NotSupportedError, # pylint: disable=no-member
+ rawpy.LibRawNonFatalError, # pylint: disable=no-member
+ ) as err:
+ raise errors.ReaderError(path) from err
+
+## EOF ##