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Start QOI decoding with a zero-initialized array of previously seen pixels #9008

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Merged
radarhere merged 1 commit into from
Jun 11, 2025
Merged

Start QOI decoding with a zero-initialized array of previously seen pixels #9008

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Binary file added Tests/images/op_index.qoi
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6 changes: 6 additions & 0 deletions Tests/test_file_qoi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,3 +28,9 @@ def test_invalid_file() -> None:

with pytest.raises(SyntaxError):
QoiImagePlugin.QoiImageFile(invalid_file)


def test_op_index() -> None:
# QOI_OP_INDEX as the first chunk
with Image.open("Tests/images/op_index.qoi") as im:
assert im.getpixel((0, 0)) == (0, 0, 0, 0)
2 changes: 1 addition & 1 deletion src/PIL/QoiImagePlugin.py
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Expand Up @@ -51,7 +51,7 @@ def decode(self, buffer: bytes | Image.SupportsArrayInterface) -> tuple[int, int
assert self.fd is not None

self._previously_seen_pixels = {}
self._add_to_previous_pixels(bytearray((0, 0, 0, 255)))
self._previous_pixel = bytearray((0, 0, 0, 255))

data = bytearray()
bands = Image.getmodebands(self.mode)
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