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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Project: Fable Input Output
# https://github.com/silx-kit/fabio
#
# Copyright (C) European Synchrotron Radiation Facility, Grenoble, France
#
# Principal author: Jérôme Kieffer (Jerome.Kieffer@ESRF.eu)
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""
Test JPEG format
"""
from __future__ import print_function, with_statement, division, absolute_import
import unittest
import os
import tempfile
import shutil
import logging
logger = logging.getLogger(__name__)
import fabio
from .. import jpegimage
from .utilstest import UtilsTest
TEST_DIRECTORY = None
# Temporary directory where storing test data
def setUpModule():
global TEST_DIRECTORY
TEST_DIRECTORY = tempfile.mkdtemp(prefix="%s_data_" % __name__)
def tearDownModule():
shutil.rmtree(TEST_DIRECTORY)
class TestJpegImage(unittest.TestCase):
"""Test the class format"""
def setUp(self):
if jpegimage.Image is None:
self.skipTest("PIL is not available")
def test_read_uint8(self):
filename = UtilsTest.getimage("rand_uint8.jpg.bz2")[:-4]
image_format = jpegimage.JpegImage()
image = image_format.read(filename)
self.assertEqual(image.data.shape, (64, 64))
self.assertIn("jfif", image.header)
def test_read_failing_file(self):
filename = os.path.join(TEST_DIRECTORY, "2.jpg")
filename_source = UtilsTest.getimage("rand_uint8.jpg.bz2")[:-4]
with open(filename_source, "r+b") as fsource:
with open(filename, "w+b") as ftest:
ftest.write(fsource.read())
ftest.seek(1)
ftest.write(b".")
image_format = jpegimage.JpegImage()
try:
_image = image_format.read(filename)
self.fail()
except IOError:
pass
def test_read_empty_file(self):
filename = os.path.join(TEST_DIRECTORY, "3.jpg")
f = open(filename, "wb")
f.close()
image_format = jpegimage.JpegImage()
try:
_image = image_format.read(filename)
self.fail()
except IOError:
pass
def test_read_missing_file(self):
filename = os.path.join(TEST_DIRECTORY, "4.jpg")
image_format = jpegimage.JpegImage()
try:
_image = image_format.read(filename)
self.fail()
except IOError:
pass
class TestPilNotAvailable(unittest.TestCase):
def setUp(self):
filename = UtilsTest.getimage("rand_uint8.jpg.bz2")[:-4]
self.filename = filename
self.old = jpegimage.Image
def tearDown(self):
jpegimage.Image = self.old
self.filename = None
self.data = None
def open_image(self):
return fabio.open(self.filename)
def test_with_pil(self):
if jpegimage.Image is None:
self.skipTest("PIL is not available")
image = self.open_image()
self.assertIsInstance(image, jpegimage.JpegImage)
self.assertEqual(image.data.shape, (64, 64))
self.assertIn("jfif", image.header)
def test_without_pil(self):
try:
old = jpegimage.Image
jpegimage.Image = None
try:
_image = self.open_image()
self.fail()
except IOError:
pass
finally:
jpegimage.Image = old
class TestJpegImageInsideFabio(unittest.TestCase):
"""Test the format inside the fabio framework"""
def test_read_uint8(self):
if jpegimage.Image is None:
self.skipTest("PIL is not available")
filename = UtilsTest.getimage("rand_uint8.jpg.bz2")[:-4]
image = fabio.open(filename)
self.assertIsInstance(image, jpegimage.JpegImage)
self.assertEqual(image.data.shape, (64, 64))
self.assertIn("jfif", image.header)
def suite():
loader = unittest.defaultTestLoader.loadTestsFromTestCase
testsuite = unittest.TestSuite()
testsuite.addTest(loader(TestJpegImage))
testsuite.addTest(loader(TestJpegImageInsideFabio))
testsuite.addTest(loader(TestPilNotAvailable))
return testsuite
if __name__ == '__main__':
runner = unittest.TextTestRunner()
runner.run(suite())
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