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- #
- # The Python Imaging Library.
- # $Id$
- #
- # Basic McIdas support for PIL
- #
- # History:
- # 1997-05-05 fl Created (8-bit images only)
- # 2009-03-08 fl Added 16/32-bit support.
- #
- # Thanks to Richard Jones and Craig Swank for specs and samples.
- #
- # Copyright (c) Secret Labs AB 1997.
- # Copyright (c) Fredrik Lundh 1997.
- #
- # See the README file for information on usage and redistribution.
- #
-
- import struct
- from . import Image, ImageFile
-
- __version__ = "0.2"
-
-
- def _accept(s):
- return s[:8] == b"\x00\x00\x00\x00\x00\x00\x00\x04"
-
-
- ##
- # Image plugin for McIdas area images.
-
- class McIdasImageFile(ImageFile.ImageFile):
-
- format = "MCIDAS"
- format_description = "McIdas area file"
-
- def _open(self):
-
- # parse area file directory
- s = self.fp.read(256)
- if not _accept(s) or len(s) != 256:
- raise SyntaxError("not an McIdas area file")
-
- self.area_descriptor_raw = s
- self.area_descriptor = w = [0] + list(struct.unpack("!64i", s))
-
- # get mode
- if w[11] == 1:
- mode = rawmode = "L"
- elif w[11] == 2:
- # FIXME: add memory map support
- mode = "I"
- rawmode = "I;16B"
- elif w[11] == 4:
- # FIXME: add memory map support
- mode = "I"
- rawmode = "I;32B"
- else:
- raise SyntaxError("unsupported McIdas format")
-
- self.mode = mode
- self._size = w[10], w[9]
-
- offset = w[34] + w[15]
- stride = w[15] + w[10]*w[11]*w[14]
-
- self.tile = [("raw", (0, 0) + self.size, offset, (rawmode, stride, 1))]
-
-
- # --------------------------------------------------------------------
- # registry
-
- Image.register_open(McIdasImageFile.format, McIdasImageFile, _accept)
-
- # no default extension
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