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367 lines
12 KiB
Python
367 lines
12 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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from io import BytesIO
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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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self.assertEqual(im.info["version"], b"GIF89a")
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def test_invalid_file(self):
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invalid_file = "Tests/images/flower.jpg"
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self.assertRaises(SyntaxError,
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lambda: GifImagePlugin.GifImageFile(invalid_file))
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def test_optimize(self):
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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_correctness(self):
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# 256 color Palette image, posterize to > 128 and < 128 levels
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# Size bigger and smaller than 512x512
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# Check the palette for number of colors allocated.
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# Check for correctness after conversion back to RGB
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def check(colors, size, expected_palette_length):
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# make an image with empty colors in the start of the palette range
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im = Image.frombytes('P', (colors,colors),
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bytes(bytearray(list(range(256-colors,256))*colors)))
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im = im.resize((size,size))
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outfile = BytesIO()
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im.save(outfile, 'GIF')
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outfile.seek(0)
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reloaded = Image.open(outfile)
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# check palette length
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palette_length = max(i+1 for i,v in enumerate(reloaded.histogram()) if v)
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self.assertEqual(expected_palette_length, palette_length)
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self.assert_image_equal(im.convert('RGB'), reloaded.convert('RGB'))
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# These do optimize the palette
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check(128, 511, 128)
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check(64, 511, 64)
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check(4, 511, 4)
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# These don't optimize the palette
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check(128, 513, 256)
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check(64, 513, 256)
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check(4, 513, 256)
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# other limits that don't optimize the palette
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check(129, 511, 256)
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check(255, 511, 256)
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check(256, 511, 256)
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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_roundtrip_save_all(self):
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# Single frame image
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out = self.tempfile('temp.gif')
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im = hopper()
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im.save(out, save_all=True)
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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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# Multiframe image
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im = Image.open("Tests/images/dispose_bgnd.gif")
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out = self.tempfile('temp.gif')
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im.save(out, save_all=True)
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reread = Image.open(out)
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self.assertEqual(reread.n_frames, 5)
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def test_headers_saving_for_animated_gifs(self):
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important_headers = ['background', 'version', 'duration', 'loop']
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# Multiframe image
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im = Image.open("Tests/images/dispose_bgnd.gif")
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out = self.tempfile('temp.gif')
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im.save(out, save_all=True)
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reread = Image.open(out)
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for header in important_headers:
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self.assertEqual(
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im.info[header],
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reread.info[header]
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)
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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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self.assertFalse(im.is_animated)
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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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self.assertTrue(im.is_animated)
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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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def test_comment(self):
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im = Image.open(TEST_GIF)
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self.assertEqual(im.info['comment'], b"File written by Adobe Photoshop\xa8 4.0")
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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['comment'] = b"Test comment text"
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im.save(out)
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reread = Image.open(out)
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self.assertEqual(reread.info['comment'], im.info['comment'])
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def test_version(self):
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out = self.tempfile('temp.gif')
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# Test that GIF87a is used by default
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im = Image.new('L', (100, 100), '#000')
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im.save(out)
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reread = Image.open(out)
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self.assertEqual(reread.info["version"], b"GIF87a")
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# Test that adding a GIF89a feature changes the version
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im.info["transparency"] = 1
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im.save(out)
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reread = Image.open(out)
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self.assertEqual(reread.info["version"], b"GIF89a")
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# Test that a GIF87a image is also saved in that format
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im = Image.open("Tests/images/test.colors.gif")
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im.save(out)
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reread = Image.open(out)
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self.assertEqual(reread.info["version"], b"GIF87a")
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# Test that a GIF89a image is also saved in that format
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im.info["version"] = b"GIF89a"
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im.save(out)
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reread = Image.open(out)
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self.assertEqual(reread.info["version"], b"GIF87a")
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def test_append_images(self):
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out = self.tempfile('temp.gif')
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# Test appending single frame images
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im = Image.new('RGB', (100, 100), '#f00')
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ims = [Image.new('RGB', (100, 100), color) for color in ['#0f0', '#00f']]
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im.save(out, save_all=True, append_images=ims)
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reread = Image.open(out)
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self.assertEqual(reread.n_frames, 3)
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# Tests appending single and multiple frame images
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im = Image.open("Tests/images/dispose_none.gif")
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ims = [Image.open("Tests/images/dispose_prev.gif")]
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im.save(out, save_all=True, append_images=ims)
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reread = Image.open(out)
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self.assertEqual(reread.n_frames, 10)
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if __name__ == '__main__':
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unittest.main()
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