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Return LUT from LutBuilder build_default_lut() #9350

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Return LUT from LutBuilder build_default_lut() #9350

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5 changes: 5 additions & 0 deletions Tests/test_imagemorph.py
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Original file line number Diff line number Diff line change
Expand Up @@ -281,6 +281,11 @@ def test_pattern_syntax_error(pattern: str) -> None:
lb.build_lut()


def test_build_default_lut() -> None:
lb = ImageMorph.LutBuilder(op_name="corner")
assert lb.build_default_lut() == lb.lut


def test_load_invalid_mrl() -> None:
# Arrange
invalid_mrl = "Tests/images/hopper.png"
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3 changes: 2 additions & 1 deletion src/PIL/ImageMorph.py
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Expand Up @@ -92,10 +92,11 @@ def __init__(
def add_patterns(self, patterns: list[str]) -> None:
self.patterns += patterns

def build_default_lut(self) -> None:
def build_default_lut(self) -> bytearray:
symbols = [0, 1]
m = 1 << 4 # pos of current pixel
self.lut = bytearray(symbols[(i & m) > 0] for i in range(LUT_SIZE))
return self.lut

def get_lut(self) -> bytearray | None:
return self.lut
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