mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-26 18:06:18 +03:00
247 lines
7.4 KiB
Python
247 lines
7.4 KiB
Python
"""
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Helper functions.
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"""
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from __future__ import print_function
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import sys
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import tempfile
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import os
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if sys.version_info[:2] <= (2, 6):
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import unittest2 as unittest
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else:
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import unittest
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class PillowTestCase(unittest.TestCase):
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def __init__(self, *args, **kwargs):
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unittest.TestCase.__init__(self, *args, **kwargs)
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# holds last result object passed to run method:
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self.currentResult = None
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# Nicer output for --verbose
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def __str__(self):
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return self.__class__.__name__ + "." + self._testMethodName
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def run(self, result=None):
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self.currentResult = result # remember result for use later
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unittest.TestCase.run(self, result) # call superclass run method
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def delete_tempfile(self, path):
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try:
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ok = self.currentResult.wasSuccessful()
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except AttributeError: # for nosetests
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proxy = self.currentResult
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ok = (len(proxy.errors) + len(proxy.failures) == 0)
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if ok:
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# only clean out tempfiles if test passed
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try:
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os.remove(path)
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except OSError:
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pass # report?
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else:
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print("=== orphaned temp file: %s" % path)
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def assert_almost_equal(self, a, b, msg=None, eps=1e-6):
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self.assertLess(
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abs(a-b), eps,
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msg or "got %r, expected %r" % (a, b))
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def assert_deep_equal(self, a, b, msg=None):
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try:
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self.assertEqual(
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len(a), len(b),
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msg or "got length %s, expected %s" % (len(a), len(b)))
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self.assertTrue(
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all([x == y for x, y in zip(a, b)]),
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msg or "got %s, expected %s" % (a, b))
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except:
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self.assertEqual(a, b, msg)
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def assert_image(self, im, mode, size, msg=None):
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if mode is not None:
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self.assertEqual(
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im.mode, mode,
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msg or "got mode %r, expected %r" % (im.mode, mode))
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if size is not None:
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self.assertEqual(
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im.size, size,
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msg or "got size %r, expected %r" % (im.size, size))
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def assert_image_equal(self, a, b, msg=None):
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self.assertEqual(
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a.mode, b.mode,
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msg or "got mode %r, expected %r" % (a.mode, b.mode))
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self.assertEqual(
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a.size, b.size,
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msg or "got size %r, expected %r" % (a.size, b.size))
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if a.tobytes() != b.tobytes():
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self.fail(msg or "got different content")
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def assert_image_similar(self, a, b, epsilon, msg=None):
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epsilon = float(epsilon)
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self.assertEqual(
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a.mode, b.mode,
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msg or "got mode %r, expected %r" % (a.mode, b.mode))
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self.assertEqual(
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a.size, b.size,
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msg or "got size %r, expected %r" % (a.size, b.size))
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diff = 0
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try:
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ord(b'0')
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for abyte, bbyte in zip(a.tobytes(), b.tobytes()):
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diff += abs(ord(abyte)-ord(bbyte))
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except:
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for abyte, bbyte in zip(a.tobytes(), b.tobytes()):
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diff += abs(abyte-bbyte)
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ave_diff = float(diff)/(a.size[0]*a.size[1])
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self.assertGreaterEqual(
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epsilon, ave_diff,
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(msg or '') +
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" average pixel value difference %.4f > epsilon %.4f" % (
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ave_diff, epsilon))
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def assert_warning(self, warn_class, func):
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import warnings
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result = None
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with warnings.catch_warnings(record=True) as w:
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# Cause all warnings to always be triggered.
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warnings.simplefilter("always")
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# Hopefully trigger a warning.
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result = func()
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# Verify some things.
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self.assertGreaterEqual(len(w), 1)
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found = False
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for v in w:
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if issubclass(v.category, warn_class):
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found = True
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break
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self.assertTrue(found)
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return result
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def skipKnownBadTest(self, msg=None, platform=None,
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travis=None, interpreter=None):
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# Skip if platform/travis matches, and
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# PILLOW_RUN_KNOWN_BAD is not true in the environment.
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if bool(os.environ.get('PILLOW_RUN_KNOWN_BAD', False)):
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print(os.environ.get('PILLOW_RUN_KNOWN_BAD', False))
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return
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skip = True
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if platform is not None:
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skip = sys.platform.startswith(platform)
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if travis is not None:
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skip = skip and (travis == bool(os.environ.get('TRAVIS', False)))
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if interpreter is not None:
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skip = skip and (interpreter == 'pypy' and
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hasattr(sys, 'pypy_version_info'))
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if skip:
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self.skipTest(msg or "Known Bad Test")
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def tempfile(self, template):
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assert template[:5] in ("temp.", "temp_")
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(fd, path) = tempfile.mkstemp(template[4:], template[:4])
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os.close(fd)
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self.addCleanup(self.delete_tempfile, path)
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return path
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def open_withImagemagick(self, f):
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if not imagemagick_available():
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raise IOError()
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outfile = self.tempfile("temp.png")
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if command_succeeds([IMCONVERT, f, outfile]):
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from PIL import Image
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return Image.open(outfile)
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raise IOError()
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# helpers
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py3 = (sys.version_info >= (3, 0))
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def fromstring(data):
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from io import BytesIO
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from PIL import Image
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return Image.open(BytesIO(data))
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def tostring(im, string_format, **options):
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from io import BytesIO
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out = BytesIO()
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im.save(out, string_format, **options)
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return out.getvalue()
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def hopper(mode=None, cache={}):
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from PIL import Image
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if mode is None:
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# Always return fresh not-yet-loaded version of image.
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# Operations on not-yet-loaded images is separate class of errors
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# what we should catch.
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return Image.open("Tests/images/hopper.ppm")
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# Use caching to reduce reading from disk but so an original copy is
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# returned each time and the cached image isn't modified by tests
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# (for fast, isolated, repeatable tests).
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im = cache.get(mode)
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if im is None:
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if mode == "F":
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im = hopper("L").convert(mode)
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elif mode[:4] == "I;16":
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im = hopper("I").convert(mode)
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else:
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im = hopper().convert(mode)
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cache[mode] = im
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return im.copy()
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def command_succeeds(cmd):
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"""
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Runs the command, which must be a list of strings. Returns True if the
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command succeeds, or False if an OSError was raised by subprocess.Popen.
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"""
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import subprocess
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with open(os.devnull, 'w') as f:
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try:
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subprocess.Popen(cmd, stdout=f, stderr=subprocess.STDOUT).wait()
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except OSError:
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return False
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return True
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def djpeg_available():
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return command_succeeds(['djpeg', '--help'])
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def cjpeg_available():
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return command_succeeds(['cjpeg', '--help'])
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def netpbm_available():
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return (command_succeeds(["ppmquant", "--help"]) and
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command_succeeds(["ppmtogif", "--help"]))
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def imagemagick_available():
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return IMCONVERT and command_succeeds([IMCONVERT, '-version'])
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def on_appveyor():
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return 'APPVEYOR' in os.environ
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if sys.platform == 'win32':
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IMCONVERT = os.environ.get('MAGICK_HOME', '')
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if IMCONVERT:
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IMCONVERT = os.path.join(IMCONVERT, 'convert.exe')
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else:
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IMCONVERT = 'convert'
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# End of file
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