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GIF: Clear the buffer to the correct initial color before decoding frame 0.

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This ensures that transparent pixels in the first frame data clear to
transparency and not to some previously decoded frame.
This commit is contained in:
Glenn Maynard 2018-10-23 23:09:13 -05:00 committed by Andrew Murray
parent 68b844de74
commit df10a72000
1 changed files with 10 additions and 0 deletions
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10
src/PIL/GifImagePlugin.py
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@ -286,6 +286,16 @@ class GifImageFile(ImageFile.ImageFile):
if self.palette:
self.mode = "P"
def load_prepare(self):
super(GifImageFile, self).load_prepare()
if self.__frame == 0:
# On the first frame, clear the buffer. Use the transparency index
# if we have one, otherwise use the background index.
default_color = self.info.get("transparency",
self.info.get("background", 0))
self.im.paste(default_color, (0,0, self.size[0], self.size[1]))
def tell(self):
return self.__frame