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Pillow/Tests/test_imagecms.py
Jon Dufresne 4cd4adddc3 Improve handling of file resources 
Follow Python's file object semantics. User code is responsible for
closing resources (usually through a context manager) in a deterministic
way.

To achieve this, remove __del__ functions. These functions used to
closed open file handlers in an attempt to silence Python
ResourceWarnings. However, using __del__ has the following drawbacks:

- __del__ isn't called until the object's reference count reaches 0.
  Therefore, resource handlers remain open or in use longer than
  necessary.

- The __del__ method isn't guaranteed to execute on system exit. See the
  Python documentation:

  https://docs.python.org/3/reference/datamodel.html#object.__del__

  > It is not guaranteed that __del__() methods are called for objects
  > that still exist when the interpreter exits.

- Exceptions that occur inside __del__ are ignored instead of raised.
  This has the potential of hiding bugs. This is also in the Python
  documentation:

  > Warning: Due to the precarious circumstances under which __del__()
  > methods are invoked, exceptions that occur during their execution
  > are ignored, and a warning is printed to sys.stderr instead.

Instead, always close resource handlers when they are no longer in use.
This will close the file handler at a specified point in the user's code
and not wait until the interpreter chooses to. It is always guaranteed
to run. And, if an exception occurs while closing the file handler, the
bug will not be ignored.

Now, when code receives a ResourceWarning, it will highlight an area
that is mishandling resources. It should not simply be silenced, but
fixed by closing resources with a context manager.

All warnings that were emitted during tests have been cleaned up. To
enable warnings, I passed the `-Wa` CLI option to Python. This exposed
some mishandling of resources in ImageFile.__init__() and
SpiderImagePlugin.loadImageSeries(), they too were fixed.
2019-10-12 08:27:17 -07:00

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import datetime
import os
from io import BytesIO
from PIL import Image, ImageMode
from .helper import PillowTestCase, hopper
try:
from PIL import ImageCms
from PIL.ImageCms import ImageCmsProfile
ImageCms.core.profile_open
except ImportError:
# Skipped via setUp()
pass
SRGB = "Tests/icc/sRGB_IEC61966-2-1_black_scaled.icc"
HAVE_PROFILE = os.path.exists(SRGB)
class TestImageCms(PillowTestCase):
def setUp(self):
try:
from PIL import ImageCms
# need to hit getattr to trigger the delayed import error
ImageCms.core.profile_open
except ImportError as v:
self.skipTest(v)
def skip_missing(self):
if not HAVE_PROFILE:
self.skipTest("SRGB profile not available")
def test_sanity(self):
# basic smoke test.
# this mostly follows the cms_test outline.
v = ImageCms.versions() # should return four strings
self.assertEqual(v[0], "1.0.0 pil")
self.assertEqual(list(map(type, v)), [str, str, str, str])
# internal version number
self.assertRegex(ImageCms.core.littlecms_version, r"\d+\.\d+$")
self.skip_missing()
i = ImageCms.profileToProfile(hopper(), SRGB, SRGB)
self.assert_image(i, "RGB", (128, 128))
i = hopper()
ImageCms.profileToProfile(i, SRGB, SRGB, inPlace=True)
self.assert_image(i, "RGB", (128, 128))
t = ImageCms.buildTransform(SRGB, SRGB, "RGB", "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "RGB", (128, 128))
with hopper() as i:
t = ImageCms.buildTransform(SRGB, SRGB, "RGB", "RGB")
ImageCms.applyTransform(hopper(), t, inPlace=True)
self.assert_image(i, "RGB", (128, 128))
p = ImageCms.createProfile("sRGB")
o = ImageCms.getOpenProfile(SRGB)
t = ImageCms.buildTransformFromOpenProfiles(p, o, "RGB", "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "RGB", (128, 128))
t = ImageCms.buildProofTransform(SRGB, SRGB, SRGB, "RGB", "RGB")
self.assertEqual(t.inputMode, "RGB")
self.assertEqual(t.outputMode, "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "RGB", (128, 128))
# test PointTransform convenience API
hopper().point(t)
def test_name(self):
self.skip_missing()
# get profile information for file
self.assertEqual(
ImageCms.getProfileName(SRGB).strip(),
"IEC 61966-2-1 Default RGB Colour Space - sRGB",
)
def test_info(self):
self.skip_missing()
self.assertEqual(
ImageCms.getProfileInfo(SRGB).splitlines(),
[
"sRGB IEC61966-2-1 black scaled",
"",
"Copyright International Color Consortium, 2009",
"",
],
)
def test_copyright(self):
self.skip_missing()
self.assertEqual(
ImageCms.getProfileCopyright(SRGB).strip(),
"Copyright International Color Consortium, 2009",
)
def test_manufacturer(self):
self.skip_missing()
self.assertEqual(ImageCms.getProfileManufacturer(SRGB).strip(), "")
def test_model(self):
self.skip_missing()
self.assertEqual(
ImageCms.getProfileModel(SRGB).strip(),
"IEC 61966-2-1 Default RGB Colour Space - sRGB",
)
def test_description(self):
self.skip_missing()
self.assertEqual(
ImageCms.getProfileDescription(SRGB).strip(),
"sRGB IEC61966-2-1 black scaled",
)
def test_intent(self):
self.skip_missing()
self.assertEqual(ImageCms.getDefaultIntent(SRGB), 0)
self.assertEqual(
ImageCms.isIntentSupported(
SRGB, ImageCms.INTENT_ABSOLUTE_COLORIMETRIC, ImageCms.DIRECTION_INPUT
),
1,
)
def test_profile_object(self):
# same, using profile object
p = ImageCms.createProfile("sRGB")
# self.assertEqual(ImageCms.getProfileName(p).strip(),
# 'sRGB built-in - (lcms internal)')
# self.assertEqual(ImageCms.getProfileInfo(p).splitlines(),
# ['sRGB built-in', '', 'WhitePoint : D65 (daylight)', '', ''])
self.assertEqual(ImageCms.getDefaultIntent(p), 0)
self.assertEqual(
ImageCms.isIntentSupported(
p, ImageCms.INTENT_ABSOLUTE_COLORIMETRIC, ImageCms.DIRECTION_INPUT
),
1,
)
def test_extensions(self):
# extensions
with Image.open("Tests/images/rgb.jpg") as i:
p = ImageCms.getOpenProfile(BytesIO(i.info["icc_profile"]))
self.assertEqual(
ImageCms.getProfileName(p).strip(),
"IEC 61966-2.1 Default RGB colour space - sRGB",
)
def test_exceptions(self):
# Test mode mismatch
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
self.assertRaises(ValueError, t.apply_in_place, hopper("RGBA"))
# the procedural pyCMS API uses PyCMSError for all sorts of errors
with hopper() as im:
self.assertRaises(
ImageCms.PyCMSError, ImageCms.profileToProfile, im, "foo", "bar"
)
self.assertRaises(
ImageCms.PyCMSError, ImageCms.buildTransform, "foo", "bar", "RGB", "RGB"
)
self.assertRaises(ImageCms.PyCMSError, ImageCms.getProfileName, None)
self.skip_missing()
self.assertRaises(
ImageCms.PyCMSError, ImageCms.isIntentSupported, SRGB, None, None
)
def test_display_profile(self):
# try fetching the profile for the current display device
ImageCms.get_display_profile()
def test_lab_color_profile(self):
ImageCms.createProfile("LAB", 5000)
ImageCms.createProfile("LAB", 6500)
def test_unsupported_color_space(self):
self.assertRaises(ImageCms.PyCMSError, ImageCms.createProfile, "unsupported")
def test_invalid_color_temperature(self):
self.assertRaises(ImageCms.PyCMSError, ImageCms.createProfile, "LAB", "invalid")
def test_simple_lab(self):
i = Image.new("RGB", (10, 10), (128, 128, 128))
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(psRGB, pLab, "RGB", "LAB")
i_lab = ImageCms.applyTransform(i, t)
self.assertEqual(i_lab.mode, "LAB")
k = i_lab.getpixel((0, 0))
# not a linear luminance map. so L != 128:
self.assertEqual(k, (137, 128, 128))
l_data = i_lab.getdata(0)
a_data = i_lab.getdata(1)
b_data = i_lab.getdata(2)
self.assertEqual(list(l_data), [137] * 100)
self.assertEqual(list(a_data), [128] * 100)
self.assertEqual(list(b_data), [128] * 100)
def test_lab_color(self):
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(psRGB, pLab, "RGB", "LAB")
# Need to add a type mapping for some PIL type to TYPE_Lab_8 in
# findLCMSType, and have that mapping work back to a PIL mode
# (likely RGB).
i = ImageCms.applyTransform(hopper(), t)
self.assert_image(i, "LAB", (128, 128))
# i.save('temp.lab.tif') # visually verified vs PS.
target = Image.open("Tests/images/hopper.Lab.tif")
self.assert_image_similar(i, target, 3.5)
def test_lab_srgb(self):
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
img = Image.open("Tests/images/hopper.Lab.tif")
img_srgb = ImageCms.applyTransform(img, t)
# img_srgb.save('temp.srgb.tif') # visually verified vs ps.
self.assert_image_similar(hopper(), img_srgb, 30)
self.assertTrue(img_srgb.info["icc_profile"])
profile = ImageCmsProfile(BytesIO(img_srgb.info["icc_profile"]))
self.assertIn("sRGB", ImageCms.getProfileDescription(profile))
def test_lab_roundtrip(self):
# check to see if we're at least internally consistent.
psRGB = ImageCms.createProfile("sRGB")
pLab = ImageCms.createProfile("LAB")
t = ImageCms.buildTransform(psRGB, pLab, "RGB", "LAB")
t2 = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
i = ImageCms.applyTransform(hopper(), t)
self.assertEqual(i.info["icc_profile"], ImageCmsProfile(pLab).tobytes())
out = ImageCms.applyTransform(i, t2)
self.assert_image_similar(hopper(), out, 2)
def test_profile_tobytes(self):
with Image.open("Tests/images/rgb.jpg") as i:
p = ImageCms.getOpenProfile(BytesIO(i.info["icc_profile"]))
p2 = ImageCms.getOpenProfile(BytesIO(p.tobytes()))
# not the same bytes as the original icc_profile,
# but it does roundtrip
self.assertEqual(p.tobytes(), p2.tobytes())
self.assertEqual(ImageCms.getProfileName(p), ImageCms.getProfileName(p2))
self.assertEqual(
ImageCms.getProfileDescription(p), ImageCms.getProfileDescription(p2)
)
def test_extended_information(self):
self.skip_missing()
o = ImageCms.getOpenProfile(SRGB)
p = o.profile
def assert_truncated_tuple_equal(tup1, tup2, digits=10):
# Helper function to reduce precision of tuples of floats
# recursively and then check equality.
power = 10 ** digits
def truncate_tuple(tuple_or_float):
return tuple(
truncate_tuple(val)
if isinstance(val, tuple)
else int(val * power) / power
for val in tuple_or_float
)
self.assertEqual(truncate_tuple(tup1), truncate_tuple(tup2))
self.assertEqual(p.attributes, 4294967296)
assert_truncated_tuple_equal(
p.blue_colorant,
(
(0.14306640625, 0.06060791015625, 0.7140960693359375),
(0.1558847490315394, 0.06603820639433387, 0.06060791015625),
),
)
assert_truncated_tuple_equal(
p.blue_primary,
(
(0.14306641366715667, 0.06060790921083026, 0.7140960805782015),
(0.15588475410450106, 0.06603820408959558, 0.06060790921083026),
),
)
assert_truncated_tuple_equal(
p.chromatic_adaptation,
(
(
(1.04791259765625, 0.0229339599609375, -0.050201416015625),
(0.02960205078125, 0.9904632568359375, -0.0170745849609375),
(-0.009246826171875, 0.0150604248046875, 0.7517852783203125),
),
(
(1.0267159024652783, 0.022470062342089134, 0.0229339599609375),
(0.02951378324103937, 0.9875098886387147, 0.9904632568359375),
(-0.012205438066465256, 0.01987915407854985, 0.0150604248046875),
),
),
)
self.assertIsNone(p.chromaticity)
self.assertEqual(
p.clut,
{
0: (False, False, True),
1: (False, False, True),
2: (False, False, True),
3: (False, False, True),
},
)
self.assertIsNone(p.colorant_table)
self.assertIsNone(p.colorant_table_out)
self.assertIsNone(p.colorimetric_intent)
self.assertEqual(p.connection_space, "XYZ ")
self.assertEqual(p.copyright, "Copyright International Color Consortium, 2009")
self.assertEqual(p.creation_date, datetime.datetime(2009, 2, 27, 21, 36, 31))
self.assertEqual(p.device_class, "mntr")
assert_truncated_tuple_equal(
p.green_colorant,
(
(0.3851470947265625, 0.7168731689453125, 0.097076416015625),
(0.32119769927720654, 0.5978443449048152, 0.7168731689453125),
),
)
assert_truncated_tuple_equal(
p.green_primary,
(
(0.3851470888162112, 0.7168731974161346, 0.09707641738998518),
(0.32119768793686687, 0.5978443567149709, 0.7168731974161346),
),
)
self.assertEqual(p.header_flags, 0)
self.assertEqual(p.header_manufacturer, "\x00\x00\x00\x00")
self.assertEqual(p.header_model, "\x00\x00\x00\x00")
self.assertEqual(
p.icc_measurement_condition,
{
"backing": (0.0, 0.0, 0.0),
"flare": 0.0,
"geo": "unknown",
"observer": 1,
"illuminant_type": "D65",
},
)
self.assertEqual(p.icc_version, 33554432)
self.assertIsNone(p.icc_viewing_condition)
self.assertEqual(
p.intent_supported,
{
0: (True, True, True),
1: (True, True, True),
2: (True, True, True),
3: (True, True, True),
},
)
self.assertTrue(p.is_matrix_shaper)
self.assertEqual(p.luminance, ((0.0, 80.0, 0.0), (0.0, 1.0, 80.0)))
self.assertIsNone(p.manufacturer)
assert_truncated_tuple_equal(
p.media_black_point,
(
(0.012054443359375, 0.0124969482421875, 0.01031494140625),
(0.34573304157549234, 0.35842450765864337, 0.0124969482421875),
),
)
assert_truncated_tuple_equal(
p.media_white_point,
(
(0.964202880859375, 1.0, 0.8249053955078125),
(0.3457029219802284, 0.3585375327567059, 1.0),
),
)
assert_truncated_tuple_equal(
(p.media_white_point_temperature,), (5000.722328847392,)
)
self.assertEqual(p.model, "IEC 61966-2-1 Default RGB Colour Space - sRGB")
self.assertIsNone(p.perceptual_rendering_intent_gamut)
self.assertEqual(p.profile_description, "sRGB IEC61966-2-1 black scaled")
self.assertEqual(p.profile_id, b")\xf8=\xde\xaf\xf2U\xaexB\xfa\xe4\xca\x839\r")
assert_truncated_tuple_equal(
p.red_colorant,
(
(0.436065673828125, 0.2224884033203125, 0.013916015625),
(0.6484536316398539, 0.3308524880306778, 0.2224884033203125),
),
)
assert_truncated_tuple_equal(
p.red_primary,
(
(0.43606566581047446, 0.22248840582960838, 0.013916015621759925),
(0.6484536250319214, 0.3308524944738204, 0.22248840582960838),
),
)
self.assertEqual(p.rendering_intent, 0)
self.assertIsNone(p.saturation_rendering_intent_gamut)
self.assertIsNone(p.screening_description)
self.assertIsNone(p.target)
self.assertEqual(p.technology, "CRT ")
self.assertEqual(p.version, 2.0)
self.assertEqual(
p.viewing_condition, "Reference Viewing Condition in IEC 61966-2-1"
)
self.assertEqual(p.xcolor_space, "RGB ")
def test_deprecations(self):
self.skip_missing()
o = ImageCms.getOpenProfile(SRGB)
p = o.profile
def helper_deprecated(attr, expected):
result = self.assert_warning(DeprecationWarning, getattr, p, attr)
self.assertEqual(result, expected)
# p.color_space
helper_deprecated("color_space", "RGB")
# p.pcs
helper_deprecated("pcs", "XYZ")
# p.product_copyright
helper_deprecated(
"product_copyright", "Copyright International Color Consortium, 2009"
)
# p.product_desc
helper_deprecated("product_desc", "sRGB IEC61966-2-1 black scaled")
# p.product_description
helper_deprecated("product_description", "sRGB IEC61966-2-1 black scaled")
# p.product_manufacturer
helper_deprecated("product_manufacturer", "")
# p.product_model
helper_deprecated(
"product_model", "IEC 61966-2-1 Default RGB Colour Space - sRGB"
)
def test_profile_typesafety(self):
""" Profile init type safety
prepatch, these would segfault, postpatch they should emit a typeerror
"""
with self.assertRaises(TypeError):
ImageCms.ImageCmsProfile(0).tobytes()
with self.assertRaises(TypeError):
ImageCms.ImageCmsProfile(1).tobytes()
def assert_aux_channel_preserved(self, mode, transform_in_place, preserved_channel):
def create_test_image():
# set up test image with something interesting in the tested aux channel.
# fmt: off
nine_grid_deltas = [ # noqa: E131
(-1, -1), (-1, 0), (-1, 1),
(0, -1), (0, 0), (0, 1),
(1, -1), (1, 0), (1, 1),
]
# fmt: on
chans = []
bands = ImageMode.getmode(mode).bands
for band_ndx in range(len(bands)):
channel_type = "L" # 8-bit unorm
channel_pattern = hopper(channel_type)
# paste pattern with varying offsets to avoid correlation
# potentially hiding some bugs (like channels getting mixed).
paste_offset = (
int(band_ndx / float(len(bands)) * channel_pattern.size[0]),
int(band_ndx / float(len(bands) * 2) * channel_pattern.size[1]),
)
channel_data = Image.new(channel_type, channel_pattern.size)
for delta in nine_grid_deltas:
channel_data.paste(
channel_pattern,
tuple(
paste_offset[c] + delta[c] * channel_pattern.size[c]
for c in range(2)
),
)
chans.append(channel_data)
return Image.merge(mode, chans)
source_image = create_test_image()
source_image_aux = source_image.getchannel(preserved_channel)
# create some transform, it doesn't matter which one
source_profile = ImageCms.createProfile("sRGB")
destination_profile = ImageCms.createProfile("sRGB")
t = ImageCms.buildTransform(
source_profile, destination_profile, inMode=mode, outMode=mode
)
# apply transform
if transform_in_place:
ImageCms.applyTransform(source_image, t, inPlace=True)
result_image = source_image
else:
result_image = ImageCms.applyTransform(source_image, t, inPlace=False)
result_image_aux = result_image.getchannel(preserved_channel)
self.assert_image_equal(source_image_aux, result_image_aux)
def test_preserve_auxiliary_channels_rgba(self):
self.assert_aux_channel_preserved(
mode="RGBA", transform_in_place=False, preserved_channel="A"
)
def test_preserve_auxiliary_channels_rgba_in_place(self):
self.assert_aux_channel_preserved(
mode="RGBA", transform_in_place=True, preserved_channel="A"
)
def test_preserve_auxiliary_channels_rgbx(self):
self.assert_aux_channel_preserved(
mode="RGBX", transform_in_place=False, preserved_channel="X"
)
def test_preserve_auxiliary_channels_rgbx_in_place(self):
self.assert_aux_channel_preserved(
mode="RGBX", transform_in_place=True, preserved_channel="X"
)
def test_auxiliary_channels_isolated(self):
# test data in aux channels does not affect non-aux channels
aux_channel_formats = [
# format, profile, color-only format, source test image
("RGBA", "sRGB", "RGB", hopper("RGBA")),
("RGBX", "sRGB", "RGB", hopper("RGBX")),
("LAB", "LAB", "LAB", Image.open("Tests/images/hopper.Lab.tif")),
]
for src_format in aux_channel_formats:
for dst_format in aux_channel_formats:
for transform_in_place in [True, False]:
# inplace only if format doesn't change
if transform_in_place and src_format[0] != dst_format[0]:
continue
# convert with and without AUX data, test colors are equal
source_profile = ImageCms.createProfile(src_format[1])
destination_profile = ImageCms.createProfile(dst_format[1])
source_image = src_format[3]
test_transform = ImageCms.buildTransform(
source_profile,
destination_profile,
inMode=src_format[0],
outMode=dst_format[0],
)
# test conversion from aux-ful source
if transform_in_place:
test_image = source_image.copy()
ImageCms.applyTransform(
test_image, test_transform, inPlace=True
)
else:
test_image = ImageCms.applyTransform(
source_image, test_transform, inPlace=False
)
# reference conversion from aux-less source
reference_transform = ImageCms.buildTransform(
source_profile,
destination_profile,
inMode=src_format[2],
outMode=dst_format[2],
)
reference_image = ImageCms.applyTransform(
source_image.convert(src_format[2]), reference_transform
)
self.assert_image_equal(
test_image.convert(dst_format[2]), reference_image
)
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