PIL.MicImagePlugin 源代码

#
# The Python Imaging Library.
# $Id$
#
# Microsoft Image Composer support for PIL
#
# Notes:
#       uses TiffImagePlugin.py to read the actual image streams
#
# History:
#       97-01-20 fl     Created
#
# Copyright (c) Secret Labs AB 1997.
# Copyright (c) Fredrik Lundh 1997.
#
# See the README file for information on usage and redistribution.
#


import olefile

from . import Image, TiffImagePlugin

#
# --------------------------------------------------------------------


def _accept(prefix):
    return prefix[:8] == olefile.MAGIC


##
# Image plugin for Microsoft's Image Composer file format.


[文档] class MicImageFile(TiffImagePlugin.TiffImageFile): format = "MIC" format_description = "Microsoft Image Composer" _close_exclusive_fp_after_loading = False def _open(self): # read the OLE directory and see if this is a likely # to be a Microsoft Image Composer file try: self.ole = olefile.OleFileIO(self.fp) except OSError as e: msg = "not an MIC file; invalid OLE file" raise SyntaxError(msg) from e # find ACI subfiles with Image members (maybe not the # best way to identify MIC files, but what the... ;-) self.images = [] for path in self.ole.listdir(): if path[1:] and path[0][-4:] == ".ACI" and path[1] == "Image": self.images.append(path) # if we didn't find any images, this is probably not # an MIC file. if not self.images: msg = "not an MIC file; no image entries" raise SyntaxError(msg) self.frame = None self._n_frames = len(self.images) self.is_animated = self._n_frames > 1 self.seek(0)
[文档] def seek(self, frame): if not self._seek_check(frame): return try: filename = self.images[frame] except IndexError as e: msg = "no such frame" raise EOFError(msg) from e self.fp = self.ole.openstream(filename) TiffImagePlugin.TiffImageFile._open(self) self.frame = frame
[文档] def tell(self): return self.frame
[文档] def close(self): self.ole.close() super().close()
def __exit__(self, *args): self.ole.close() super().__exit__()
# # -------------------------------------------------------------------- Image.register_open(MicImageFile.format, MicImageFile, _accept) Image.register_extension(MicImageFile.format, ".mic")