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Expand GIF to include frames with extents outside the image size

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This commit is contained in:
Andrew Murray 2019-05-02 19:46:17 +10:00
parent c47792caeb
commit 27134340f5
3 changed files with 8 additions and 0 deletions
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Tests/images/test_extents.gif Normal file
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Width:  |  Height:  |  Size: 368 B

6
Tests/test_file_gif.py
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@ -663,3 +663,9 @@ class TestFileGif(PillowTestCase):
self.assertEqual(im.tile[0][3][0], 11) # LZW bits
# codec error prepatch
im.load()
def test_extents(self):
im = Image.open('Tests/images/test_extents.gif')
self.assertEqual(im.size, (100, 100))
im.seek(1)
self.assertEqual(im.size, (150, 150))

2
src/PIL/GifImagePlugin.py
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@ -233,6 +233,8 @@ class GifImageFile(ImageFile.ImageFile):
# extent
x0, y0 = i16(s[0:]), i16(s[2:])
x1, y1 = x0 + i16(s[4:]), y0 + i16(s[6:])
if x1 > self.size[0] or y1 > self.size[1]:
self._size = max(x1, self.size[0]), max(y1, self.size[1])
self.dispose_extent = x0, y0, x1, y1
flags = i8(s[8])