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232 lines
6.9 KiB
Python
232 lines
6.9 KiB
Python
from helper import unittest, PillowTestCase, hopper, 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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TEST_GIF = "Tests/images/hopper.gif"
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with open(TEST_GIF, "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(TEST_GIF)
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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_grayscale(optimize):
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im = Image.new("L", (1, 1), 0)
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filename = BytesIO()
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im.save(filename, "GIF", optimize=optimize)
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return len(filename.getvalue())
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def test_bilevel(optimize):
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im = Image.new("1", (1, 1), 0)
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test_file = BytesIO()
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im.save(test_file, "GIF", optimize=optimize)
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return len(test_file.getvalue())
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self.assertEqual(test_grayscale(0), 800)
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self.assertEqual(test_grayscale(1), 38)
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self.assertEqual(test_bilevel(0), 800)
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self.assertEqual(test_bilevel(1), 800)
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def test_optimize_full_l(self):
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from io import BytesIO
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im = Image.frombytes("L", (16, 16), bytes(bytearray(range(256))))
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test_file = BytesIO()
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im.save(test_file, "GIF", optimize=True)
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self.assertEqual(im.mode, "L")
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def test_roundtrip(self):
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out = self.tempfile('temp.gif')
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im = hopper()
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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(TEST_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'), hopper(), 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(TEST_GIF)
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im = im.convert('RGB')
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im = im.resize((100, 100), Image.LANCZOS)
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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.copy().save(out, *args, **kwargs)
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reloaded = Image.open(out)
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return 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_similar(im, roundtrip(im), 1)
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self.assert_image_similar(im, roundtrip(im, optimize=True), 1)
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im = im.convert("RGB")
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# check automatic P conversion
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reloaded = roundtrip(im).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(TEST_GIF).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(TEST_GIF).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_n_frames(self):
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im = Image.open(TEST_GIF)
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self.assertEqual(im.n_frames, 1)
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im = Image.open("Tests/images/iss634.gif")
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self.assertEqual(im.n_frames, 42)
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def test_eoferror(self):
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im = Image.open(TEST_GIF)
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n_frames = im.n_frames
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while True:
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n_frames -= 1
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try:
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im.seek(n_frames)
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break
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except EOFError:
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self.assertTrue(im.tell() < n_frames)
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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
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# first frame
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self.assertEqual(img.histogram()[img.info['transparency']], 0)
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def test_duration(self):
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duration = 1000
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out = self.tempfile('temp.gif')
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fp = open(out, "wb")
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im = Image.new('L', (100, 100), '#000')
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for s in GifImagePlugin.getheader(im)[0] + GifImagePlugin.getdata(im, duration=duration):
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fp.write(s)
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fp.write(b";")
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fp.close()
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reread = Image.open(out)
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self.assertEqual(reread.info['duration'], duration)
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def test_number_of_loops(self):
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number_of_loops = 2
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out = self.tempfile('temp.gif')
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fp = open(out, "wb")
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im = Image.new('L', (100, 100), '#000')
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for s in GifImagePlugin.getheader(im)[0] + GifImagePlugin.getdata(im, loop=number_of_loops):
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fp.write(s)
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fp.write(b";")
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fp.close()
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reread = Image.open(out)
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self.assertEqual(reread.info['loop'], number_of_loops)
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def test_background(self):
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out = self.tempfile('temp.gif')
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im = Image.new('L', (100, 100), '#000')
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im.info['background'] = 1
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im.save(out)
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reread = Image.open(out)
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self.assertEqual(reread.info['background'], im.info['background'])
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if __name__ == '__main__':
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unittest.main()
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# End of file
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