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Do not expand GIF during n_frames

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Andrew Murray 2022-03-21 23:19:26 +11:00
parent 15dc291469
commit d806227199
2 changed files with 6 additions and 1 deletions
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5
Tests/test_file_gif.py
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@ -971,6 +971,11 @@ def test_lzw_bits():
def test_extents(): def test_extents():
with Image.open("Tests/images/test_extents.gif") as im: with Image.open("Tests/images/test_extents.gif") as im:
assert im.size == (100, 100) assert im.size == (100, 100)
# Check that n_frames does not change the size
assert im.n_frames == 2
assert im.size == (100, 100)
im.seek(1) im.seek(1)
assert im.size == (150, 150) assert im.size == (150, 150)

2
src/PIL/GifImagePlugin.py
View File

@ -261,7 +261,7 @@ class GifImageFile(ImageFile.ImageFile):
# extent # extent
x0, y0 = i16(s, 0), i16(s, 2) x0, y0 = i16(s, 0), i16(s, 2)
x1, y1 = x0 + i16(s, 4), y0 + i16(s, 6) x1, y1 = x0 + i16(s, 4), y0 + i16(s, 6)
if x1 > self.size[0] or y1 > self.size[1]: if (x1 > self.size[0] or y1 > self.size[1]) and update_image:
self._size = max(x1, self.size[0]), max(y1, self.size[1]) self._size = max(x1, self.size[0]), max(y1, self.size[1])
self.dispose_extent = x0, y0, x1, y1 self.dispose_extent = x0, y0, x1, y1
flags = s[8] flags = s[8]