mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-25 17:36:18 +03:00
373 lines
11 KiB
Python
373 lines
11 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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import unittest
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from PIL import Image, ImageMath
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from PIL._util import py3
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import logging
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logger = logging.getLogger(__name__)
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HAS_UPLOADER = False
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if os.environ.get('SHOW_ERRORS', None):
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# local img.show for errors.
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HAS_UPLOADER = True
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class test_image_results:
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@classmethod
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def upload(self, a, b):
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a.show()
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b.show()
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else:
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try:
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import test_image_results
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HAS_UPLOADER = True
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except ImportError:
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pass
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def convert_to_comparable(a, b):
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new_a, new_b = a, b
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if a.mode == 'P':
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new_a = Image.new('L', a.size)
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new_b = Image.new('L', b.size)
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new_a.putdata(a.getdata())
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new_b.putdata(b.getdata())
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elif a.mode == 'I;16':
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new_a = a.convert('I')
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new_b = b.convert('I')
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return new_a, new_b
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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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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 pytest
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ok = True
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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_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 Exception:
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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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if HAS_UPLOADER:
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try:
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url = test_image_results.upload(a, b)
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logger.error("Url for test images: %s" % url)
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except Exception:
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pass
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self.fail(msg or "got different content")
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def assert_image_equal_tofile(self, a, filename, msg=None, mode=None):
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with Image.open(filename) as img:
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if mode:
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img = img.convert(mode)
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self.assert_image_equal(a, img, msg)
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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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a, b = convert_to_comparable(a, b)
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diff = 0
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for ach, bch in zip(a.split(), b.split()):
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chdiff = ImageMath.eval("abs(a - b)", a=ach, b=bch).convert('L')
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diff += sum(i * num for i, num in enumerate(chdiff.histogram()))
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ave_diff = float(diff)/(a.size[0]*a.size[1])
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try:
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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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except Exception as e:
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if HAS_UPLOADER:
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try:
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url = test_image_results.upload(a, b)
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logger.error("Url for test images: %s" % url)
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except Exception:
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pass
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raise e
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def assert_image_similar_tofile(self, a, filename, epsilon, msg=None,
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mode=None):
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with Image.open(filename) as img:
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if mode:
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img = img.convert(mode)
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self.assert_image_similar(a, img, epsilon, msg)
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def assert_warning(self, warn_class, func, *args, **kwargs):
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import warnings
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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(*args, **kwargs)
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# Verify some things.
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if warn_class is None:
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self.assertEqual(len(w), 0,
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"Expected no warnings, got %s" %
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[v.category for v in w])
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else:
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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 assert_all_same(self, items, msg=None):
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self.assertEqual(items.count(items[0]), len(items), msg)
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def assert_not_all_same(self, items, msg=None):
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self.assertNotEqual(items.count(items[0]), len(items), msg)
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def assert_tuple_approx_equal(self, actuals, targets, threshold, msg):
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"""Tests if actuals has values within threshold from targets"""
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value = True
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for i, target in enumerate(targets):
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value *= (target - threshold <= actuals[i] <= target + threshold)
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self.assertTrue(value,
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msg + ': ' + repr(actuals) + ' != ' + repr(targets))
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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 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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return Image.open(outfile)
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raise IOError()
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@unittest.skipIf(sys.platform.startswith('win32'), "requires Unix or macOS")
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class PillowLeakTestCase(PillowTestCase):
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# requires unix/macOS
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iterations = 100 # count
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mem_limit = 512 # k
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def _get_mem_usage(self):
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"""
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Gets the RUSAGE memory usage, returns in K. Encapsulates the difference
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between macOS and Linux rss reporting
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:returns: memory usage in kilobytes
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"""
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from resource import getrusage, RUSAGE_SELF
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mem = getrusage(RUSAGE_SELF).ru_maxrss
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if sys.platform == 'darwin':
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# man 2 getrusage:
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# ru_maxrss
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# This is the maximum resident set size utilized (in bytes).
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return mem / 1024 # Kb
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else:
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# linux
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# man 2 getrusage
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# ru_maxrss (since Linux 2.6.32)
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# This is the maximum resident set size used (in kilobytes).
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return mem # Kb
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def _test_leak(self, core):
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start_mem = self._get_mem_usage()
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for cycle in range(self.iterations):
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core()
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mem = (self._get_mem_usage() - start_mem)
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msg = 'memory usage limit exceeded in iteration %d' % cycle
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self.assertLess(mem, self.mem_limit, msg)
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# helpers
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if not py3:
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# Remove DeprecationWarning in Python 3
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PillowTestCase.assertRaisesRegex = PillowTestCase.assertRaisesRegexp
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PillowTestCase.assertRegex = PillowTestCase.assertRegexpMatches
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def fromstring(data):
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from io import BytesIO
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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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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, 'wb') as f:
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try:
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subprocess.call(cmd, stdout=f, stderr=subprocess.STDOUT)
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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', '-version'])
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def cjpeg_available():
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return command_succeeds(['cjpeg', '-version'])
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def netpbm_available():
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return (command_succeeds(["ppmquant", "--version"]) and
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command_succeeds(["ppmtogif", "--version"]))
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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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def distro():
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if os.path.exists('/etc/os-release'):
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with open('/etc/os-release', 'r') as f:
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for line in f:
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if 'ID=' in line:
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return line.strip().split('=')[1]
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class cached_property(object):
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def __init__(self, func):
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self.func = func
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def __get__(self, instance, cls=None):
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result = instance.__dict__[self.func.__name__] = self.func(instance)
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return result
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