DEP: Remove paeth_predictor

This function is unused.
CodSpeedHQ · Jul 25, 2024 · 413f3d0 · 413f3d0
1 parent 2fefed8
commit 413f3d0
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diff --git a/pypdf/_utils.py b/pypdf/_utils.py
@@ -390,15 +390,6 @@ def ord_(b: Union[int, str, bytes]) -> Union[int, bytes]:
 WHITESPACES_AS_REGEXP = b"[" + WHITESPACES_AS_BYTES + b"]"
 
 
-def paeth_predictor(left: int, up: int, up_left: int) -> int:
- p = left + up - up_left
- dist_left = abs(p - left)
- dist_up = abs(p - up)
- dist_up_left = abs(p - up_left)
-
- return min((left, dist_left), (up, dist_up), (up_left, dist_up_left), key=lambda x: x[1])[0]
-
-
 def deprecate(msg: str, stacklevel: int = 3) -> None:
  warnings.warn(msg, DeprecationWarning, stacklevel=stacklevel)
 

diff --git a/tests/test_utils.py b/tests/test_utils.py
@@ -132,24 +132,6 @@ def test_deprecate_no_replacement():
  assert warn[0].message.args[0] == error_msg
 
 
-@pytest.mark.parametrize(
- ("left", "up", "upleft", "expected"),
- [
- (0, 0, 0, 0),
- (1, 0, 0, 1),
- (0, 1, 0, 1),
- (0, 0, 1, 0),
- (1, 2, 3, 1),
- (2, 1, 3, 1),
- (1, 3, 2, 2),
- (3, 1, 2, 2),
- (3, 2, 1, 3),
- ],
-)
-def test_paeth_predictor(left, up, upleft, expected):
- assert pypdf._utils.paeth_predictor(left, up, upleft) == expected
-
-
 @pytest.mark.parametrize(
  ("dat", "pos", "to_read", "expected", "expected_pos"),
  [