mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-26 18:06:18 +03:00
345 lines
9.0 KiB
Python
345 lines
9.0 KiB
Python
"""
|
|
Helper functions.
|
|
"""
|
|
|
|
import logging
|
|
import os
|
|
import subprocess
|
|
import sys
|
|
import tempfile
|
|
import unittest
|
|
from io import BytesIO
|
|
|
|
import pytest
|
|
from PIL import Image, ImageMath
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
HAS_UPLOADER = False
|
|
|
|
if os.environ.get("SHOW_ERRORS", None):
|
|
# local img.show for errors.
|
|
HAS_UPLOADER = True
|
|
|
|
class test_image_results:
|
|
@staticmethod
|
|
def upload(a, b):
|
|
a.show()
|
|
b.show()
|
|
|
|
|
|
elif "GITHUB_ACTIONS" in os.environ:
|
|
HAS_UPLOADER = True
|
|
|
|
class test_image_results:
|
|
@staticmethod
|
|
def upload(a, b):
|
|
dir_errors = os.path.join(os.path.dirname(__file__), "errors")
|
|
os.makedirs(dir_errors, exist_ok=True)
|
|
tmpdir = tempfile.mkdtemp(dir=dir_errors)
|
|
a.save(os.path.join(tmpdir, "a.png"))
|
|
b.save(os.path.join(tmpdir, "b.png"))
|
|
return tmpdir
|
|
|
|
|
|
else:
|
|
try:
|
|
import test_image_results
|
|
|
|
HAS_UPLOADER = True
|
|
except ImportError:
|
|
pass
|
|
|
|
|
|
def convert_to_comparable(a, b):
|
|
new_a, new_b = a, b
|
|
if a.mode == "P":
|
|
new_a = Image.new("L", a.size)
|
|
new_b = Image.new("L", b.size)
|
|
new_a.putdata(a.getdata())
|
|
new_b.putdata(b.getdata())
|
|
elif a.mode == "I;16":
|
|
new_a = a.convert("I")
|
|
new_b = b.convert("I")
|
|
return new_a, new_b
|
|
|
|
|
|
def assert_deep_equal(a, b, msg=None):
|
|
try:
|
|
assert len(a) == len(b), msg or "got length {}, expected {}".format(
|
|
len(a), len(b)
|
|
)
|
|
except Exception:
|
|
assert a == b, msg
|
|
|
|
|
|
def assert_image(im, mode, size, msg=None):
|
|
if mode is not None:
|
|
assert im.mode == mode, msg or "got mode {!r}, expected {!r}".format(
|
|
im.mode, mode
|
|
)
|
|
|
|
if size is not None:
|
|
assert im.size == size, msg or "got size {!r}, expected {!r}".format(
|
|
im.size, size
|
|
)
|
|
|
|
|
|
def assert_image_equal(a, b, msg=None):
|
|
assert a.mode == b.mode, msg or "got mode {!r}, expected {!r}".format(
|
|
a.mode, b.mode
|
|
)
|
|
assert a.size == b.size, msg or "got size {!r}, expected {!r}".format(
|
|
a.size, b.size
|
|
)
|
|
if a.tobytes() != b.tobytes():
|
|
if HAS_UPLOADER:
|
|
try:
|
|
url = test_image_results.upload(a, b)
|
|
logger.error("Url for test images: %s" % url)
|
|
except Exception:
|
|
pass
|
|
|
|
assert False, msg or "got different content"
|
|
|
|
|
|
def assert_image_equal_tofile(a, filename, msg=None, mode=None):
|
|
with Image.open(filename) as img:
|
|
if mode:
|
|
img = img.convert(mode)
|
|
assert_image_equal(a, img, msg)
|
|
|
|
|
|
def assert_image_similar(a, b, epsilon, msg=None):
|
|
assert a.mode == b.mode, msg or "got mode {!r}, expected {!r}".format(
|
|
a.mode, b.mode
|
|
)
|
|
assert a.size == b.size, msg or "got size {!r}, expected {!r}".format(
|
|
a.size, b.size
|
|
)
|
|
|
|
a, b = convert_to_comparable(a, b)
|
|
|
|
diff = 0
|
|
for ach, bch in zip(a.split(), b.split()):
|
|
chdiff = ImageMath.eval("abs(a - b)", a=ach, b=bch).convert("L")
|
|
diff += sum(i * num for i, num in enumerate(chdiff.histogram()))
|
|
|
|
ave_diff = diff / (a.size[0] * a.size[1])
|
|
try:
|
|
assert epsilon >= ave_diff, (
|
|
msg or ""
|
|
) + " average pixel value difference %.4f > epsilon %.4f" % (ave_diff, epsilon)
|
|
except Exception as e:
|
|
if HAS_UPLOADER:
|
|
try:
|
|
url = test_image_results.upload(a, b)
|
|
logger.error("Url for test images: %s" % url)
|
|
except Exception:
|
|
pass
|
|
raise e
|
|
|
|
|
|
def assert_image_similar_tofile(a, filename, epsilon, msg=None, mode=None):
|
|
with Image.open(filename) as img:
|
|
if mode:
|
|
img = img.convert(mode)
|
|
assert_image_similar(a, img, epsilon, msg)
|
|
|
|
|
|
def assert_all_same(items, msg=None):
|
|
assert items.count(items[0]) == len(items), msg
|
|
|
|
|
|
def assert_not_all_same(items, msg=None):
|
|
assert items.count(items[0]) != len(items), msg
|
|
|
|
|
|
def assert_tuple_approx_equal(actuals, targets, threshold, msg):
|
|
"""Tests if actuals has values within threshold from targets"""
|
|
value = True
|
|
for i, target in enumerate(targets):
|
|
value *= target - threshold <= actuals[i] <= target + threshold
|
|
|
|
assert value, msg + ": " + repr(actuals) + " != " + repr(targets)
|
|
|
|
|
|
def skip_known_bad_test(msg=None):
|
|
# Skip if PILLOW_RUN_KNOWN_BAD is not true in the environment.
|
|
if not os.environ.get("PILLOW_RUN_KNOWN_BAD", False):
|
|
pytest.skip(msg or "Known bad test")
|
|
|
|
|
|
class PillowTestCase(unittest.TestCase):
|
|
def delete_tempfile(self, path):
|
|
try:
|
|
os.remove(path)
|
|
except OSError:
|
|
pass # report?
|
|
|
|
def tempfile(self, template):
|
|
assert template[:5] in ("temp.", "temp_")
|
|
fd, path = tempfile.mkstemp(template[4:], template[:4])
|
|
os.close(fd)
|
|
|
|
self.addCleanup(self.delete_tempfile, path)
|
|
return path
|
|
|
|
def open_withImagemagick(self, f):
|
|
if not imagemagick_available():
|
|
raise OSError()
|
|
|
|
outfile = self.tempfile("temp.png")
|
|
if command_succeeds([IMCONVERT, f, outfile]):
|
|
return Image.open(outfile)
|
|
raise OSError()
|
|
|
|
|
|
@unittest.skipIf(sys.platform.startswith("win32"), "requires Unix or macOS")
|
|
class PillowLeakTestCase(PillowTestCase):
|
|
# requires unix/macOS
|
|
iterations = 100 # count
|
|
mem_limit = 512 # k
|
|
|
|
def _get_mem_usage(self):
|
|
"""
|
|
Gets the RUSAGE memory usage, returns in K. Encapsulates the difference
|
|
between macOS and Linux rss reporting
|
|
|
|
:returns: memory usage in kilobytes
|
|
"""
|
|
|
|
from resource import getrusage, RUSAGE_SELF
|
|
|
|
mem = getrusage(RUSAGE_SELF).ru_maxrss
|
|
if sys.platform == "darwin":
|
|
# man 2 getrusage:
|
|
# ru_maxrss
|
|
# This is the maximum resident set size utilized (in bytes).
|
|
return mem / 1024 # Kb
|
|
else:
|
|
# linux
|
|
# man 2 getrusage
|
|
# ru_maxrss (since Linux 2.6.32)
|
|
# This is the maximum resident set size used (in kilobytes).
|
|
return mem # Kb
|
|
|
|
def _test_leak(self, core):
|
|
start_mem = self._get_mem_usage()
|
|
for cycle in range(self.iterations):
|
|
core()
|
|
mem = self._get_mem_usage() - start_mem
|
|
msg = "memory usage limit exceeded in iteration %d" % cycle
|
|
self.assertLess(mem, self.mem_limit, msg)
|
|
|
|
|
|
# helpers
|
|
|
|
|
|
def fromstring(data):
|
|
return Image.open(BytesIO(data))
|
|
|
|
|
|
def tostring(im, string_format, **options):
|
|
out = BytesIO()
|
|
im.save(out, string_format, **options)
|
|
return out.getvalue()
|
|
|
|
|
|
def hopper(mode=None, cache={}):
|
|
if mode is None:
|
|
# Always return fresh not-yet-loaded version of image.
|
|
# Operations on not-yet-loaded images is separate class of errors
|
|
# what we should catch.
|
|
return Image.open("Tests/images/hopper.ppm")
|
|
# Use caching to reduce reading from disk but so an original copy is
|
|
# returned each time and the cached image isn't modified by tests
|
|
# (for fast, isolated, repeatable tests).
|
|
im = cache.get(mode)
|
|
if im is None:
|
|
if mode == "F":
|
|
im = hopper("L").convert(mode)
|
|
elif mode[:4] == "I;16":
|
|
im = hopper("I").convert(mode)
|
|
else:
|
|
im = hopper().convert(mode)
|
|
cache[mode] = im
|
|
return im.copy()
|
|
|
|
|
|
def command_succeeds(cmd):
|
|
"""
|
|
Runs the command, which must be a list of strings. Returns True if the
|
|
command succeeds, or False if an OSError was raised by subprocess.Popen.
|
|
"""
|
|
try:
|
|
subprocess.call(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.STDOUT)
|
|
except OSError:
|
|
return False
|
|
return True
|
|
|
|
|
|
def djpeg_available():
|
|
return command_succeeds(["djpeg", "-version"])
|
|
|
|
|
|
def cjpeg_available():
|
|
return command_succeeds(["cjpeg", "-version"])
|
|
|
|
|
|
def netpbm_available():
|
|
return command_succeeds(["ppmquant", "--version"]) and command_succeeds(
|
|
["ppmtogif", "--version"]
|
|
)
|
|
|
|
|
|
def imagemagick_available():
|
|
return IMCONVERT and command_succeeds([IMCONVERT, "-version"])
|
|
|
|
|
|
def on_appveyor():
|
|
return "APPVEYOR" in os.environ
|
|
|
|
|
|
def on_github_actions():
|
|
return "GITHUB_ACTIONS" in os.environ
|
|
|
|
|
|
def on_ci():
|
|
# Travis and AppVeyor have "CI"
|
|
# Azure Pipelines has "TF_BUILD"
|
|
# GitHub Actions has "GITHUB_ACTIONS"
|
|
return (
|
|
"CI" in os.environ or "TF_BUILD" in os.environ or "GITHUB_ACTIONS" in os.environ
|
|
)
|
|
|
|
|
|
def is_big_endian():
|
|
return sys.byteorder == "big"
|
|
|
|
|
|
def is_win32():
|
|
return sys.platform.startswith("win32")
|
|
|
|
|
|
def is_pypy():
|
|
return hasattr(sys, "pypy_translation_info")
|
|
|
|
|
|
if sys.platform == "win32":
|
|
IMCONVERT = os.environ.get("MAGICK_HOME", "")
|
|
if IMCONVERT:
|
|
IMCONVERT = os.path.join(IMCONVERT, "convert.exe")
|
|
else:
|
|
IMCONVERT = "convert"
|
|
|
|
|
|
class cached_property:
|
|
def __init__(self, func):
|
|
self.func = func
|
|
|
|
def __get__(self, instance, cls=None):
|
|
result = instance.__dict__[self.func.__name__] = self.func(instance)
|
|
return result
|