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https://github.com/python-pillow/Pillow.git
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4de5477b61
With the introduction and use of pytest, it is simple and easy to
execute specific tests in isolation through documented command line
arguments. Either by specifying the module path or through the `-k
EXPRESSION` argument. There is no longer any need to provide the
boilerplate:
if __name__ == '__main__':
unittest.main()
To every test file. It is simply noise.
The pattern remains in test files that aren't named with `test_*` as
those files are not discovered and executed by pytest by default.
154 lines
4.9 KiB
Python
154 lines
4.9 KiB
Python
from .helper import PillowTestCase
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from PIL import Image
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try:
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from PIL import _webp
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HAVE_WEBP = True
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except ImportError:
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HAVE_WEBP = False
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class TestFileWebpAnimation(PillowTestCase):
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def setUp(self):
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if not HAVE_WEBP:
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self.skipTest('WebP support not installed')
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return
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if not _webp.HAVE_WEBPANIM:
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self.skipTest("WebP library does not contain animation support, "
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"not testing animation")
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def test_n_frames(self):
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"""
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Ensure that WebP format sets n_frames and is_animated
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attributes correctly.
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"""
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im = Image.open("Tests/images/hopper.webp")
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self.assertEqual(im.n_frames, 1)
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self.assertFalse(im.is_animated)
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im = Image.open("Tests/images/iss634.webp")
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self.assertEqual(im.n_frames, 42)
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self.assertTrue(im.is_animated)
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def test_write_animation_L(self):
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"""
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Convert an animated GIF to animated WebP, then compare the
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frame count, and first and last frames to ensure they're
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visually similar.
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"""
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orig = Image.open("Tests/images/iss634.gif")
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self.assertGreater(orig.n_frames, 1)
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temp_file = self.tempfile("temp.webp")
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orig.save(temp_file, save_all=True)
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im = Image.open(temp_file)
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self.assertEqual(im.n_frames, orig.n_frames)
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# Compare first and last frames to the original animated GIF
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orig.load()
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im.load()
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self.assert_image_similar(im, orig.convert("RGBA"), 25.0)
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orig.seek(orig.n_frames-1)
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im.seek(im.n_frames-1)
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orig.load()
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im.load()
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self.assert_image_similar(im, orig.convert("RGBA"), 25.0)
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def test_write_animation_RGB(self):
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"""
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Write an animated WebP from RGB frames, and ensure the frames
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are visually similar to the originals.
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"""
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def check(temp_file):
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im = Image.open(temp_file)
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self.assertEqual(im.n_frames, 2)
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# Compare first frame to original
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im.load()
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self.assert_image_equal(im, frame1.convert("RGBA"))
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# Compare second frame to original
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im.seek(1)
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im.load()
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self.assert_image_equal(im, frame2.convert("RGBA"))
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frame1 = Image.open('Tests/images/anim_frame1.webp')
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frame2 = Image.open('Tests/images/anim_frame2.webp')
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temp_file1 = self.tempfile("temp.webp")
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frame1.copy().save(temp_file1,
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save_all=True, append_images=[frame2],
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lossless=True)
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check(temp_file1)
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# Tests appending using a generator
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def imGenerator(ims):
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for im in ims:
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yield im
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temp_file2 = self.tempfile("temp_generator.webp")
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frame1.copy().save(temp_file2,
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save_all=True, append_images=imGenerator([frame2]),
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lossless=True)
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check(temp_file2)
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def test_timestamp_and_duration(self):
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"""
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Try passing a list of durations, and make sure the encoded
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timestamps and durations are correct.
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"""
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durations = [0, 10, 20, 30, 40]
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temp_file = self.tempfile("temp.webp")
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frame1 = Image.open('Tests/images/anim_frame1.webp')
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frame2 = Image.open('Tests/images/anim_frame2.webp')
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frame1.save(temp_file, save_all=True,
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append_images=[frame2, frame1, frame2, frame1],
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duration=durations)
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im = Image.open(temp_file)
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self.assertEqual(im.n_frames, 5)
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self.assertTrue(im.is_animated)
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# Check that timestamps and durations match original values specified
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ts = 0
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for frame in range(im.n_frames):
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im.seek(frame)
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im.load()
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self.assertEqual(im.info["duration"], durations[frame])
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self.assertEqual(im.info["timestamp"], ts)
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ts += durations[frame]
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def test_seeking(self):
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"""
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Create an animated WebP file, and then try seeking through
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frames in reverse-order, verifying the timestamps and durations
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are correct.
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"""
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dur = 33
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temp_file = self.tempfile("temp.webp")
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frame1 = Image.open('Tests/images/anim_frame1.webp')
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frame2 = Image.open('Tests/images/anim_frame2.webp')
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frame1.save(temp_file, save_all=True,
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append_images=[frame2, frame1, frame2, frame1],
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duration=dur)
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im = Image.open(temp_file)
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self.assertEqual(im.n_frames, 5)
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self.assertTrue(im.is_animated)
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# Traverse frames in reverse, checking timestamps and durations
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ts = dur * (im.n_frames-1)
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for frame in reversed(range(im.n_frames)):
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im.seek(frame)
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im.load()
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self.assertEqual(im.info["duration"], dur)
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self.assertEqual(im.info["timestamp"], ts)
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ts -= dur
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