_compression.py

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# This file is part of afw.
#
# Developed for the LSST Data Management System.
# This product includes software developed by the LSST Project
# (https://www.lsst.org).
# See the COPYRIGHT file at the top-level directory of this distribution
# for details of code ownership.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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__all__ = ["imageCompressionDisabled"]
 
from contextlib import contextmanager
from ._fits import getAllowImageCompression, setAllowImageCompression
 
 
@contextmanager
def imageCompressionDisabled():
    """Create a context where FITS image compression is disabled.
 
    The previous compression setting is restored on exit.
    """
    old = getAllowImageCompression()
    try:
        setAllowImageCompression(False)
        yield
    finally:
        setAllowImageCompression(old)