MAINT: Remove unused paeth_predictor (#2773)

py-pdf · Aug 5, 2024 · 38f3925 · 38f3925
1 parent 582557e
commit 38f3925
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diff --git a/pypdf/_utils.py b/pypdf/_utils.py
@@ -390,20 +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)
-
-    if dist_left <= dist_up and dist_left <= dist_up_left:
-        return left
-    elif dist_up <= dist_up_left:
-        return up
-    else:
-        return up_left
-
-
 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"),
     [