Pillow/Tests/test_file_mpo.py

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import warnings
from io import BytesIO
import pytest
from PIL import Image
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from .helper import (
assert_image_equal,
assert_image_similar,
is_pypy,
skip_unless_feature,
)
test_files = ["Tests/images/sugarshack.mpo", "Tests/images/frozenpond.mpo"]
pytestmark = skip_unless_feature("jpg")
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def roundtrip(im, **options):
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out = BytesIO()
im.save(out, "MPO", **options)
test_bytes = out.tell()
out.seek(0)
im = Image.open(out)
im.bytes = test_bytes # for testing only
return im
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@pytest.mark.parametrize("test_file", test_files)
def test_sanity(test_file):
with Image.open(test_file) as im:
im.load()
assert im.mode == "RGB"
assert im.size == (640, 480)
assert im.format == "MPO"
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@pytest.mark.skipif(is_pypy(), reason="Requires CPython")
def test_unclosed_file():
def open():
im = Image.open(test_files[0])
im.load()
pytest.warns(ResourceWarning, open)
def test_closed_file():
with warnings.catch_warnings():
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im = Image.open(test_files[0])
im.load()
im.close()
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.
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def test_seek_after_close():
im = Image.open(test_files[0])
im.close()
with pytest.raises(ValueError):
im.seek(1)
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def test_context_manager():
with warnings.catch_warnings():
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with Image.open(test_files[0]) as im:
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.
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im.load()
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@pytest.mark.parametrize("test_file", test_files)
def test_app(test_file):
# Test APP/COM reader (@PIL135)
with Image.open(test_file) as im:
assert im.applist[0][0] == "APP1"
assert im.applist[1][0] == "APP2"
assert (
im.applist[1][1][:16] == b"MPF\x00MM\x00*\x00\x00\x00\x08\x00\x03\xb0\x00"
)
assert len(im.applist) == 2
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@pytest.mark.parametrize("test_file", test_files)
def test_exif(test_file):
with Image.open(test_file) as im:
info = im._getexif()
assert info[272] == "Nintendo 3DS"
assert info[296] == 2
assert info[34665] == 188
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def test_frame_size():
# This image has been hexedited to contain a different size
# in the EXIF data of the second frame
with Image.open("Tests/images/sugarshack_frame_size.mpo") as im:
assert im.size == (640, 480)
im.seek(1)
assert im.size == (680, 480)
im.seek(0)
assert im.size == (640, 480)
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def test_ignore_frame_size():
# Ignore the different size of the second frame
# since this is not a "Large Thumbnail" image
with Image.open("Tests/images/ignore_frame_size.mpo") as im:
assert im.size == (64, 64)
im.seek(1)
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assert (
im.mpinfo[0xB002][1]["Attribute"]["MPType"]
== "Multi-Frame Image: (Disparity)"
)
assert im.size == (64, 64)
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def test_parallax():
# Nintendo
with Image.open("Tests/images/sugarshack.mpo") as im:
exif = im.getexif()
assert exif.get_ifd(0x927C)[0x1101]["Parallax"] == -44.798187255859375
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# Fujifilm
with Image.open("Tests/images/fujifilm.mpo") as im:
im.seek(1)
exif = im.getexif()
assert exif.get_ifd(0x927C)[0xB211] == -3.125
def test_reload_exif_after_seek():
with Image.open("Tests/images/sugarshack.mpo") as im:
exif = im.getexif()
del exif[296]
im.seek(1)
assert 296 in exif
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@pytest.mark.parametrize("test_file", test_files)
def test_mp(test_file):
with Image.open(test_file) as im:
mpinfo = im._getmp()
assert mpinfo[45056] == b"0100"
assert mpinfo[45057] == 2
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def test_mp_offset():
# This image has been manually hexedited to have an IFD offset of 10
# in APP2 data, in contrast to normal 8
with Image.open("Tests/images/sugarshack_ifd_offset.mpo") as im:
mpinfo = im._getmp()
assert mpinfo[45056] == b"0100"
assert mpinfo[45057] == 2
def test_mp_no_data():
# This image has been manually hexedited to have the second frame
# beyond the end of the file
with Image.open("Tests/images/sugarshack_no_data.mpo") as im:
with pytest.raises(ValueError):
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.
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im.seek(1)
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@pytest.mark.parametrize("test_file", test_files)
def test_mp_attribute(test_file):
with Image.open(test_file) as im:
mpinfo = im._getmp()
frame_number = 0
for mpentry in mpinfo[0xB002]:
mpattr = mpentry["Attribute"]
if frame_number:
assert not mpattr["RepresentativeImageFlag"]
else:
assert mpattr["RepresentativeImageFlag"]
assert not mpattr["DependentParentImageFlag"]
assert not mpattr["DependentChildImageFlag"]
assert mpattr["ImageDataFormat"] == "JPEG"
assert mpattr["MPType"] == "Multi-Frame Image: (Disparity)"
assert mpattr["Reserved"] == 0
frame_number += 1
@pytest.mark.parametrize("test_file", test_files)
def test_seek(test_file):
with Image.open(test_file) as im:
assert im.tell() == 0
# prior to first image raises an error, both blatant and borderline
with pytest.raises(EOFError):
im.seek(-1)
with pytest.raises(EOFError):
im.seek(-523)
# after the final image raises an error,
# both blatant and borderline
with pytest.raises(EOFError):
im.seek(2)
with pytest.raises(EOFError):
im.seek(523)
# bad calls shouldn't change the frame
assert im.tell() == 0
# this one will work
im.seek(1)
assert im.tell() == 1
# and this one, too
im.seek(0)
assert im.tell() == 0
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def test_n_frames():
with Image.open("Tests/images/sugarshack.mpo") as im:
assert im.n_frames == 2
assert im.is_animated
def test_eoferror():
with Image.open("Tests/images/sugarshack.mpo") as im:
n_frames = im.n_frames
# Test seeking past the last frame
with pytest.raises(EOFError):
im.seek(n_frames)
assert im.tell() < n_frames
# Test that seeking to the last frame does not raise an error
im.seek(n_frames - 1)
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@pytest.mark.parametrize("test_file", test_files)
def test_image_grab(test_file):
with Image.open(test_file) as im:
assert im.tell() == 0
im0 = im.tobytes()
im.seek(1)
assert im.tell() == 1
im1 = im.tobytes()
im.seek(0)
assert im.tell() == 0
im02 = im.tobytes()
assert im0 == im02
assert im0 != im1
@pytest.mark.parametrize("test_file", test_files)
def test_save(test_file):
with Image.open(test_file) as im:
assert im.tell() == 0
jpg0 = roundtrip(im)
assert_image_similar(im, jpg0, 30)
im.seek(1)
assert im.tell() == 1
jpg1 = roundtrip(im)
assert_image_similar(im, jpg1, 30)
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def test_save_all():
for test_file in test_files:
with Image.open(test_file) as im:
im_reloaded = roundtrip(im, save_all=True)
im.seek(0)
assert_image_similar(im, im_reloaded, 30)
im.seek(1)
im_reloaded.seek(1)
assert_image_similar(im, im_reloaded, 30)
im = Image.new("RGB", (1, 1))
im2 = Image.new("RGB", (1, 1), "#f00")
im_reloaded = roundtrip(im, save_all=True, append_images=[im2])
assert_image_equal(im, im_reloaded)
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assert im_reloaded.mpinfo[45056] == b"0100"
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im_reloaded.seek(1)
assert_image_similar(im2, im_reloaded, 1)
# Test that a single frame image will not be saved as an MPO
jpg = roundtrip(im, save_all=True)
assert "mp" not in jpg.info