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76 lines
1.8 KiB
Python
76 lines
1.8 KiB
Python
from __future__ import annotations
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from fractions import Fraction
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from pathlib import Path
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import pytest
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from PIL import Image, TiffImagePlugin
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from PIL.TiffImagePlugin import IFDRational
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from .helper import hopper, skip_unless_feature
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def _test_equal(
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num: float | Fraction | IFDRational,
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denom: int,
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target: float | Fraction | IFDRational,
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) -> None:
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t = IFDRational(num, denom)
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assert target == t
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assert t == target
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def test_sanity() -> None:
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_test_equal(1, 1, 1)
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_test_equal(1, 1, Fraction(1, 1))
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_test_equal(2, 2, 1)
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_test_equal(1.0, 1, Fraction(1, 1))
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_test_equal(Fraction(1, 1), 1, Fraction(1, 1))
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_test_equal(IFDRational(1, 1), 1, 1)
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_test_equal(1, 2, Fraction(1, 2))
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_test_equal(1, 2, IFDRational(1, 2))
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_test_equal(7, 5, 1.4)
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def test_ranges() -> None:
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for num in range(1, 10):
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for denom in range(1, 10):
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assert IFDRational(num, denom) == IFDRational(num, denom)
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def test_nonetype() -> None:
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# Fails if the _delegate function doesn't return a valid function
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xres = IFDRational(72)
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yres = IFDRational(72)
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assert xres._val is not None
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assert xres.numerator is not None
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assert xres.denominator is not None
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assert yres._val is not None
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assert xres
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assert yres
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@pytest.mark.parametrize(
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"libtiff", (pytest.param(True, marks=skip_unless_feature("libtiff")), False)
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)
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def test_ifd_rational_save(
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monkeypatch: pytest.MonkeyPatch, tmp_path: Path, libtiff: bool
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) -> None:
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im = hopper()
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out = tmp_path / "temp.tiff"
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res = IFDRational(301, 1)
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monkeypatch.setattr(TiffImagePlugin, "WRITE_LIBTIFF", libtiff)
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im.save(out, dpi=(res, res), compression="raw")
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with Image.open(out) as reloaded:
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assert float(IFDRational(301, 1)) == float(reloaded.tag_v2[282])
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