Pillow/Tests/test_imagesequence.py
2019-06-23 07:34:39 +10:00

99 lines
3.1 KiB
Python

from .helper import PillowTestCase, hopper
from PIL import Image, ImageSequence, TiffImagePlugin
class TestImageSequence(PillowTestCase):
def test_sanity(self):
test_file = self.tempfile("temp.im")
im = hopper("RGB")
im.save(test_file)
seq = ImageSequence.Iterator(im)
index = 0
for frame in seq:
self.assert_image_equal(im, frame)
self.assertEqual(im.tell(), index)
index += 1
self.assertEqual(index, 1)
self.assertRaises(AttributeError, ImageSequence.Iterator, 0)
def test_iterator(self):
im = Image.open("Tests/images/multipage.tiff")
i = ImageSequence.Iterator(im)
for index in range(0, im.n_frames):
self.assertEqual(i[index], next(i))
self.assertRaises(IndexError, lambda: i[index + 1])
self.assertRaises(StopIteration, next, i)
def test_iterator_min_frame(self):
im = Image.open("Tests/images/hopper.psd")
i = ImageSequence.Iterator(im)
for index in range(1, im.n_frames):
self.assertEqual(i[index], next(i))
def _test_multipage_tiff(self):
im = Image.open("Tests/images/multipage.tiff")
for index, frame in enumerate(ImageSequence.Iterator(im)):
frame.load()
self.assertEqual(index, im.tell())
frame.convert("RGB")
def test_tiff(self):
self._test_multipage_tiff()
def test_libtiff(self):
codecs = dir(Image.core)
if "libtiff_encoder" not in codecs or "libtiff_decoder" not in codecs:
self.skipTest("tiff support not available")
TiffImagePlugin.READ_LIBTIFF = True
self._test_multipage_tiff()
TiffImagePlugin.READ_LIBTIFF = False
def test_consecutive(self):
im = Image.open("Tests/images/multipage.tiff")
firstFrame = None
for frame in ImageSequence.Iterator(im):
if firstFrame is None:
firstFrame = frame.copy()
for frame in ImageSequence.Iterator(im):
self.assert_image_equal(frame, firstFrame)
break
def test_palette_mmap(self):
# Using mmap in ImageFile can require to reload the palette.
im = Image.open("Tests/images/multipage-mmap.tiff")
color1 = im.getpalette()[0:3]
im.seek(0)
color2 = im.getpalette()[0:3]
self.assertEqual(color1, color2)
def test_all_frames(self):
# Test a single image
im = Image.open("Tests/images/iss634.gif")
ims = ImageSequence.all_frames(im)
self.assertEqual(len(ims), 42)
for i, im_frame in enumerate(ims):
self.assertFalse(im_frame is im)
im.seek(i)
self.assert_image_equal(im, im_frame)
# Test a series of images
ims = ImageSequence.all_frames([im, hopper(), im])
self.assertEqual(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)
self.assert_image_equal(im.rotate(90), im_frame)