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Ensure previous FLI frame is loaded before seeking to the next

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Andrew Murray 2018-11-26 18:52:51 +11:00
parent 080bfd3ee1
commit 2f7f945c84
3 changed files with 10 additions and 0 deletions
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Tests/images/a_fli.png Normal file
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7
Tests/test_file_fli.py
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@ -85,6 +85,13 @@ class TestFileFli(PillowTestCase):
layer_number = im.tell() layer_number = im.tell()
self.assertEqual(layer_number, 1) self.assertEqual(layer_number, 1)
def test_seek(self):
im = Image.open(animated_test_file)
im.seek(50)
expected = Image.open("Tests/images/a_fli.png")
self.assert_image_equal(im, expected)
if __name__ == '__main__': if __name__ == '__main__':
unittest.main() unittest.main()

3
src/PIL/FliImagePlugin.py
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@ -131,6 +131,9 @@ class FliImageFile(ImageFile.ImageFile):
self.__frame = -1 self.__frame = -1
self.__fp.seek(self.__rewind) self.__fp.seek(self.__rewind)
self.__offset = 128 self.__offset = 128
else:
# ensure that the previous frame was loaded
self.load()
if frame != self.__frame + 1: if frame != self.__frame + 1:
raise ValueError("cannot seek to frame %d" % frame) raise ValueError("cannot seek to frame %d" % frame)