mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-25 17:36:18 +03:00
369 lines
11 KiB
Python
369 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 logging
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import os
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import subprocess
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import sys
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import tempfile
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import unittest
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from io import BytesIO
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from PIL import Image, ImageMath
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from PIL._util import py3
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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 delete_tempfile(self, path):
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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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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), msg or "got length %s, expected %s" % (len(a), len(b))
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)
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self.assertTrue(
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all(x == y for x, y in zip(a, b)), msg or "got %s, expected %s" % (a, b)
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)
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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, msg or "got mode %r, expected %r" % (im.mode, mode)
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)
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if size is not None:
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self.assertEqual(
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im.size, size, msg or "got size %r, expected %r" % (im.size, size)
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)
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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, msg or "got mode %r, expected %r" % (a.mode, b.mode)
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)
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self.assertEqual(
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a.size, b.size, msg or "got size %r, expected %r" % (a.size, b.size)
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)
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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, msg or "got mode %r, expected %r" % (a.mode, b.mode)
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)
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self.assertEqual(
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a.size, b.size, msg or "got size %r, expected %r" % (a.size, b.size)
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)
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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,
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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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)
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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, 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(
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len(w), 0, "Expected no warnings, got %s" % [v.category for v in w]
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)
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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, msg + ": " + repr(actuals) + " != " + repr(targets))
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def skipKnownBadTest(self, msg=None):
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# Skip if 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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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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return Image.open(BytesIO(data))
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def tostring(im, string_format, **options):
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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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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 command_succeeds(
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["ppmtogif", "--version"]
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)
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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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def on_github_actions():
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return "GITHUB_ACTIONS" in os.environ
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def on_ci():
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# Travis and AppVeyor have "CI"
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# Azure Pipelines has "TF_BUILD"
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# GitHub Actions has "GITHUB_ACTIONS"
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return (
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"CI" in os.environ or "TF_BUILD" in os.environ or "GITHUB_ACTIONS" in os.environ
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)
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def is_win32():
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return sys.platform.startswith("win32")
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def is_pypy():
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return hasattr(sys, "pypy_translation_info")
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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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