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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
- 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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