76 lines
1.6 KiB
Python
76 lines
1.6 KiB
Python
#
|
|
# The Python Imaging Library
|
|
# $Id$
|
|
#
|
|
# FITS stub adapter
|
|
#
|
|
# Copyright (c) 1998-2003 by Fredrik Lundh
|
|
#
|
|
# See the README file for information on usage and redistribution.
|
|
#
|
|
|
|
from PIL import Image, ImageFile
|
|
|
|
_handler = None
|
|
|
|
##
|
|
# Install application-specific FITS image handler.
|
|
#
|
|
# @param handler Handler object.
|
|
|
|
|
|
def register_handler(handler):
|
|
global _handler
|
|
_handler = handler
|
|
|
|
# --------------------------------------------------------------------
|
|
# Image adapter
|
|
|
|
|
|
def _accept(prefix):
|
|
return prefix[:6] == b"SIMPLE"
|
|
|
|
|
|
class FITSStubImageFile(ImageFile.StubImageFile):
|
|
|
|
format = "FITS"
|
|
format_description = "FITS"
|
|
|
|
def _open(self):
|
|
|
|
offset = self.fp.tell()
|
|
|
|
if not _accept(self.fp.read(6)):
|
|
raise SyntaxError("Not a FITS file")
|
|
|
|
# FIXME: add more sanity checks here; mandatory header items
|
|
# include SIMPLE, BITPIX, NAXIS, etc.
|
|
|
|
self.fp.seek(offset)
|
|
|
|
# make something up
|
|
self.mode = "F"
|
|
self.size = 1, 1
|
|
|
|
loader = self._load()
|
|
if loader:
|
|
loader.open(self)
|
|
|
|
def _load(self):
|
|
return _handler
|
|
|
|
|
|
def _save(im, fp, filename):
|
|
if _handler is None or not hasattr("_handler", "save"):
|
|
raise IOError("FITS save handler not installed")
|
|
_handler.save(im, fp, filename)
|
|
|
|
|
|
# --------------------------------------------------------------------
|
|
# Registry
|
|
|
|
Image.register_open(FITSStubImageFile.format, FITSStubImageFile, _accept)
|
|
Image.register_save(FITSStubImageFile.format, _save)
|
|
|
|
Image.register_extension(FITSStubImageFile.format, ".fit")
|
|
Image.register_extension(FITSStubImageFile.format, ".fits")
|