#
# openslide-python - Python bindings for the OpenSlide library
#
# Copyright (c) 2016 Benjamin Gilbert
#
# This library is free software; you can redistribute it and/or modify it
# under the terms of version 2.1 of the GNU Lesser General Public License
# as published by the Free Software Foundation.
#
# This library 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 Lesser General Public
# License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#

from functools import wraps
import os
from PIL import Image
import unittest

try:
    import openslide._convert as _
    have_optimizations = True
except ImportError:
    have_optimizations = False


# PIL.Image cannot have zero width or height on Pillow 3.4.0 - 3.4.2
# https://github.com/python-pillow/Pillow/issues/2259
try:
    Image.new('RGBA', (1, 0))
    image_dimensions_cannot_be_zero = False
except ValueError:
    image_dimensions_cannot_be_zero = True


def file_path(name):
    return os.path.join(os.path.dirname(__file__), name)


def skip_if(condition, reason):
    if hasattr(unittest, 'skipIf'):
        # Python >= 2.7
        return unittest.skipIf(condition, reason)
    else:
        # Python 2.6
        def decorator(f):
            @wraps(f)
            def wrapper(*args, **kwargs):
                if condition:
                    return
                return f(*args, **kwargs)
            return wrapper
        return decorator