mirror of
https://github.com/python-pillow/Pillow.git
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333 lines
9.1 KiB
Python
333 lines
9.1 KiB
Python
"""
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Helper functions.
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"""
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import logging
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import os
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import shutil
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import sys
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import sysconfig
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import tempfile
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from io import BytesIO
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import pytest
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from packaging.version import parse as parse_version
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from PIL import Image, ImageMath, features
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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"):
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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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@staticmethod
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def upload(a, b):
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a.show()
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b.show()
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elif "GITHUB_ACTIONS" in os.environ:
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HAS_UPLOADER = True
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class test_image_results:
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@staticmethod
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def upload(a, b):
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dir_errors = os.path.join(os.path.dirname(__file__), "errors")
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os.makedirs(dir_errors, exist_ok=True)
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tmpdir = tempfile.mkdtemp(dir=dir_errors)
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a.save(os.path.join(tmpdir, "a.png"))
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b.save(os.path.join(tmpdir, "b.png"))
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return tmpdir
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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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def assert_deep_equal(a, b, msg=None):
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try:
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assert len(a) == len(b), msg or f"got length {len(a)}, expected {len(b)}"
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except Exception:
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assert a == b, msg
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def assert_image(im, mode, size, msg=None):
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if mode is not None:
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assert im.mode == mode, (
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msg or f"got mode {repr(im.mode)}, expected {repr(mode)}"
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)
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if size is not None:
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assert im.size == size, (
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msg or f"got size {repr(im.size)}, expected {repr(size)}"
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)
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def assert_image_equal(a, b, msg=None):
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assert a.mode == b.mode, msg or f"got mode {repr(a.mode)}, expected {repr(b.mode)}"
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assert a.size == b.size, msg or f"got size {repr(a.size)}, expected {repr(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(f"Url for test images: {url}")
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except Exception:
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pass
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assert False, msg or "got different content"
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def assert_image_equal_tofile(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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assert_image_equal(a, img, msg)
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def assert_image_similar(a, b, epsilon, msg=None):
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assert a.mode == b.mode, msg or f"got mode {repr(a.mode)}, expected {repr(b.mode)}"
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assert a.size == b.size, msg or f"got size {repr(a.size)}, expected {repr(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 = diff / (a.size[0] * a.size[1])
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try:
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assert epsilon >= ave_diff, (
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(msg or "")
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+ f" average pixel value difference {ave_diff:.4f} > epsilon {epsilon:.4f}"
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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(f"Url for test images: {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(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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assert_image_similar(a, img, epsilon, msg)
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def assert_all_same(items, msg=None):
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assert items.count(items[0]) == len(items), msg
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def assert_not_all_same(items, msg=None):
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assert items.count(items[0]) != len(items), msg
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def assert_tuple_approx_equal(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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assert value, msg + ": " + repr(actuals) + " != " + repr(targets)
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def skip_unless_feature(feature):
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reason = f"{feature} not available"
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return pytest.mark.skipif(not features.check(feature), reason=reason)
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def skip_unless_feature_version(feature, version_required, reason=None):
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if not features.check(feature):
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return pytest.mark.skip(f"{feature} not available")
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if reason is None:
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reason = f"{feature} is older than {version_required}"
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version_required = parse_version(version_required)
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version_available = parse_version(features.version(feature))
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return pytest.mark.skipif(version_available < version_required, reason=reason)
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def mark_if_feature_version(mark, feature, version_blacklist, reason=None):
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if not features.check(feature):
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return pytest.mark.pil_noop_mark()
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if reason is None:
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reason = f"{feature} is {version_blacklist}"
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version_required = parse_version(version_blacklist)
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version_available = parse_version(features.version(feature))
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if (
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version_available.major == version_required.major
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and version_available.minor == version_required.minor
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):
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return mark(reason=reason)
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return pytest.mark.pil_noop_mark()
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@pytest.mark.skipif(sys.platform.startswith("win32"), reason="Requires Unix or macOS")
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class PillowLeakTestCase:
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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 RUSAGE_SELF, getrusage
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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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# 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 = f"memory usage limit exceeded in iteration {cycle}"
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assert mem < self.mem_limit, msg
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# helpers
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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 djpeg_available():
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return bool(shutil.which("djpeg"))
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def cjpeg_available():
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return bool(shutil.which("cjpeg"))
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def netpbm_available():
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return bool(shutil.which("ppmquant") and shutil.which("ppmtogif"))
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def magick_command():
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if sys.platform == "win32":
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magickhome = os.environ.get("MAGICK_HOME")
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if magickhome:
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imagemagick = [os.path.join(magickhome, "convert.exe")]
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graphicsmagick = [os.path.join(magickhome, "gm.exe"), "convert"]
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else:
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imagemagick = None
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graphicsmagick = None
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else:
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imagemagick = ["convert"]
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graphicsmagick = ["gm", "convert"]
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if imagemagick and shutil.which(imagemagick[0]):
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return imagemagick
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if graphicsmagick and shutil.which(graphicsmagick[0]):
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return graphicsmagick
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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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# GitHub Actions and AppVeyor have "CI"
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return "CI" in os.environ
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def is_big_endian():
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return sys.byteorder == "big"
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def is_ppc64le():
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import platform
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return platform.machine() == "ppc64le"
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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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def is_mingw():
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return sysconfig.get_platform() == "mingw"
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class CachedProperty:
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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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