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158 lines
4.7 KiB
Python
158 lines
4.7 KiB
Python
from helper import unittest, PillowTestCase, lena, netpbm_available
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from PIL import Image
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from PIL import GifImagePlugin
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codecs = dir(Image.core)
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# sample gif stream
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file = "Tests/images/lena.gif"
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with open(file, "rb") as f:
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data = f.read()
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class TestFileGif(PillowTestCase):
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def setUp(self):
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if "gif_encoder" not in codecs or "gif_decoder" not in codecs:
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self.skipTest("gif support not available") # can this happen?
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def test_sanity(self):
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im = Image.open(file)
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im.load()
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self.assertEqual(im.mode, "P")
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self.assertEqual(im.size, (128, 128))
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self.assertEqual(im.format, "GIF")
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def test_optimize(self):
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from io import BytesIO
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def test(optimize):
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im = Image.new("L", (1, 1), 0)
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file = BytesIO()
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im.save(file, "GIF", optimize=optimize)
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return len(file.getvalue())
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self.assertEqual(test(0), 800)
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self.assertEqual(test(1), 38)
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def test_roundtrip(self):
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out = self.tempfile('temp.gif')
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im = lena()
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im.save(out)
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reread = Image.open(out)
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self.assert_image_similar(reread.convert('RGB'), im, 50)
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def test_roundtrip2(self):
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# see https://github.com/python-pillow/Pillow/issues/403
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out = self.tempfile('temp.gif')
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im = Image.open('Tests/images/lena.gif')
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im2 = im.copy()
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im2.save(out)
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reread = Image.open(out)
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self.assert_image_similar(reread.convert('RGB'), lena(), 50)
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def test_palette_handling(self):
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# see https://github.com/python-pillow/Pillow/issues/513
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im = Image.open('Tests/images/lena.gif')
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im = im.convert('RGB')
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im = im.resize((100, 100), Image.ANTIALIAS)
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im2 = im.convert('P', palette=Image.ADAPTIVE, colors=256)
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f = self.tempfile('temp.gif')
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im2.save(f, optimize=True)
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reloaded = Image.open(f)
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self.assert_image_similar(im, reloaded.convert('RGB'), 10)
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def test_palette_434(self):
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# see https://github.com/python-pillow/Pillow/issues/434
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def roundtrip(im, *args, **kwargs):
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out = self.tempfile('temp.gif')
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im.save(out, *args, **kwargs)
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reloaded = Image.open(out)
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return [im, reloaded]
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orig = "Tests/images/test.colors.gif"
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im = Image.open(orig)
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self.assert_image_equal(*roundtrip(im))
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self.assert_image_equal(*roundtrip(im, optimize=True))
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im = im.convert("RGB")
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# check automatic P conversion
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reloaded = roundtrip(im)[1].convert('RGB')
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self.assert_image_equal(im, reloaded)
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@unittest.skipUnless(netpbm_available(), "netpbm not available")
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def test_save_netpbm_bmp_mode(self):
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img = Image.open(file).convert("RGB")
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tempfile = self.tempfile("temp.gif")
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GifImagePlugin._save_netpbm(img, 0, tempfile)
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self.assert_image_similar(img, Image.open(tempfile).convert("RGB"), 0)
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@unittest.skipUnless(netpbm_available(), "netpbm not available")
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def test_save_netpbm_l_mode(self):
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img = Image.open(file).convert("L")
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tempfile = self.tempfile("temp.gif")
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GifImagePlugin._save_netpbm(img, 0, tempfile)
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self.assert_image_similar(img, Image.open(tempfile).convert("L"), 0)
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def test_seek(self):
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img = Image.open("Tests/images/dispose_none.gif")
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framecount = 0
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try:
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while True:
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framecount += 1
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img.seek(img.tell() +1)
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except EOFError:
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self.assertEqual(framecount, 5)
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def test_dispose_none(self):
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img = Image.open("Tests/images/dispose_none.gif")
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try:
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while True:
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img.seek(img.tell() +1)
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self.assertEqual(img.disposal_method, 1)
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except EOFError:
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pass
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def test_dispose_background(self):
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img = Image.open("Tests/images/dispose_bgnd.gif")
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try:
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while True:
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img.seek(img.tell() +1)
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self.assertEqual(img.disposal_method, 2)
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except EOFError:
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pass
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def test_dispose_previous(self):
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img = Image.open("Tests/images/dispose_prev.gif")
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try:
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while True:
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img.seek(img.tell() +1)
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self.assertEqual(img.disposal_method, 3)
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except EOFError:
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pass
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def test_iss634(self):
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img = Image.open("Tests/images/iss634.gif")
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# seek to the second frame
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img.seek(img.tell() +1)
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# all transparent pixels should be replaced with the color from the first frame
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self.assertEqual(img.histogram()[img.info['transparency']], 0)
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if __name__ == '__main__':
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unittest.main()
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# End of file
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