Pillow/Tests/test_imagesequence.py

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from __future__ import annotations
import pytest
from PIL import Image, ImageSequence, TiffImagePlugin
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from .helper import assert_image_equal, hopper, skip_unless_feature
def test_sanity(tmp_path):
test_file = str(tmp_path / "temp.im")
im = hopper("RGB")
im.save(test_file)
seq = ImageSequence.Iterator(im)
index = 0
for frame in seq:
assert_image_equal(im, frame)
assert im.tell() == index
index += 1
assert index == 1
with pytest.raises(AttributeError):
ImageSequence.Iterator(0)
def test_iterator():
with Image.open("Tests/images/multipage.tiff") as im:
i = ImageSequence.Iterator(im)
for index in range(0, im.n_frames):
assert i[index] == next(i)
with pytest.raises(IndexError):
i[index + 1]
with pytest.raises(StopIteration):
next(i)
def test_iterator_min_frame():
with Image.open("Tests/images/hopper.psd") as im:
i = ImageSequence.Iterator(im)
for index in range(1, im.n_frames):
assert i[index] == next(i)
def _test_multipage_tiff():
with Image.open("Tests/images/multipage.tiff") as im:
for index, frame in enumerate(ImageSequence.Iterator(im)):
frame.load()
assert index == im.tell()
frame.convert("RGB")
def test_tiff():
_test_multipage_tiff()
@skip_unless_feature("libtiff")
def test_libtiff():
TiffImagePlugin.READ_LIBTIFF = True
_test_multipage_tiff()
TiffImagePlugin.READ_LIBTIFF = False
def test_consecutive():
with Image.open("Tests/images/multipage.tiff") as im:
first_frame = None
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for frame in ImageSequence.Iterator(im):
if first_frame is None:
first_frame = frame.copy()
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for frame in ImageSequence.Iterator(im):
assert_image_equal(frame, first_frame)
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break
def test_palette_mmap():
# Using mmap in ImageFile can require to reload the palette.
with Image.open("Tests/images/multipage-mmap.tiff") as im:
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color1 = im.getpalette()[:3]
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im.seek(0)
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color2 = im.getpalette()[:3]
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assert color1 == color2
def test_all_frames():
# Test a single image
with Image.open("Tests/images/iss634.gif") as im:
ims = ImageSequence.all_frames(im)
assert len(ims) == 42
for i, im_frame in enumerate(ims):
assert im_frame is not im
im.seek(i)
assert_image_equal(im, im_frame)
# Test a series of images
ims = ImageSequence.all_frames([im, hopper(), im])
assert len(ims) == 85
# Test an operation
ims = ImageSequence.all_frames(im, lambda im_frame: im_frame.rotate(90))
for i, im_frame in enumerate(ims):
im.seek(i)
assert_image_equal(im.rotate(90), im_frame)