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278 lines
7.0 KiB
Python
278 lines
7.0 KiB
Python
from __future__ import annotations
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import pytest
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from PIL import Image, ImageFilter
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sample = Image.new("L", (7, 5))
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# fmt: off
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sample.putdata(sum([
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[210, 50, 20, 10, 220, 230, 80],
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[190, 210, 20, 180, 170, 40, 110],
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[120, 210, 250, 60, 220, 0, 220],
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[220, 40, 230, 80, 130, 250, 40],
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[250, 0, 80, 30, 60, 20, 110],
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], []))
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# fmt: on
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def test_imageops_box_blur() -> None:
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i = sample.filter(ImageFilter.BoxBlur(1))
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assert i.mode == sample.mode
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assert i.size == sample.size
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assert isinstance(i, Image.Image)
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def box_blur(image: Image.Image, radius: float = 1, n: int = 1) -> Image.Image:
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return image._new(image.im.box_blur((radius, radius), n))
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def assert_image(im: Image.Image, data: list[list[int]], delta: int = 0) -> None:
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it = iter(im.getdata())
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for data_row in data:
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im_row = [next(it) for _ in range(im.size[0])]
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if any(abs(data_v - im_v) > delta for data_v, im_v in zip(data_row, im_row)):
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assert im_row == data_row
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with pytest.raises(StopIteration):
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next(it)
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def assert_blur(
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im: Image.Image,
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radius: float,
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data: list[list[int]],
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passes: int = 1,
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delta: int = 0,
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) -> None:
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# check grayscale image
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assert_image(box_blur(im, radius, passes), data, delta)
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rgba = Image.merge("RGBA", (im, im, im, im))
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for band in box_blur(rgba, radius, passes).split():
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assert_image(band, data, delta)
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def test_color_modes() -> None:
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with pytest.raises(ValueError):
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box_blur(sample.convert("1"))
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with pytest.raises(ValueError):
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box_blur(sample.convert("P"))
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box_blur(sample.convert("L"))
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box_blur(sample.convert("LA"))
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box_blur(sample.convert("LA").convert("La"))
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with pytest.raises(ValueError):
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box_blur(sample.convert("I"))
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with pytest.raises(ValueError):
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box_blur(sample.convert("F"))
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box_blur(sample.convert("RGB"))
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box_blur(sample.convert("RGBA"))
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box_blur(sample.convert("RGBA").convert("RGBa"))
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box_blur(sample.convert("CMYK"))
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with pytest.raises(ValueError):
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box_blur(sample.convert("YCbCr"))
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@pytest.mark.parametrize("size", ((0, 1), (1, 0)))
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def test_zero_dimension(size: tuple[int, int]) -> None:
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assert box_blur(Image.new("L", size)).size == size
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def test_radius_0() -> None:
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assert_blur(
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sample,
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0,
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[
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# fmt: off
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[210, 50, 20, 10, 220, 230, 80],
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[190, 210, 20, 180, 170, 40, 110],
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[120, 210, 250, 60, 220, 0, 220],
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[220, 40, 230, 80, 130, 250, 40],
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[250, 0, 80, 30, 60, 20, 110],
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# fmt: on
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],
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)
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def test_radius_0_02() -> None:
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assert_blur(
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sample,
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0.02,
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[
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# fmt: off
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[206, 55, 20, 17, 215, 223, 83],
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[189, 203, 31, 171, 169, 46, 110],
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[125, 206, 241, 69, 210, 13, 210],
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[215, 49, 221, 82, 131, 235, 48],
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[244, 7, 80, 32, 60, 27, 107],
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# fmt: on
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],
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delta=2,
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)
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def test_radius_0_05() -> None:
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assert_blur(
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sample,
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0.05,
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[
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# fmt: off
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[202, 62, 22, 27, 209, 215, 88],
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[188, 194, 44, 161, 168, 56, 111],
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[131, 201, 229, 81, 198, 31, 198],
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[209, 62, 209, 86, 133, 216, 59],
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[237, 17, 80, 36, 60, 35, 103],
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# fmt: on
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],
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delta=2,
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)
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def test_radius_0_1() -> None:
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assert_blur(
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sample,
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0.1,
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[
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# fmt: off
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[196, 72, 24, 40, 200, 203, 93],
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[187, 183, 62, 148, 166, 68, 111],
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[139, 193, 213, 96, 182, 54, 182],
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[201, 78, 193, 91, 133, 191, 73],
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[227, 31, 80, 42, 61, 47, 99],
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# fmt: on
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],
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delta=1,
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)
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def test_radius_0_5() -> None:
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assert_blur(
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sample,
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0.5,
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[
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# fmt: off
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[176, 101, 46, 83, 163, 165, 111],
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[176, 149, 108, 122, 144, 120, 117],
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[164, 171, 159, 141, 134, 119, 129],
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[170, 136, 133, 114, 116, 124, 109],
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[184, 95, 72, 70, 69, 81, 89],
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# fmt: on
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],
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delta=1,
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)
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def test_radius_1() -> None:
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assert_blur(
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sample,
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1,
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[
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# fmt: off
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[170, 109, 63, 97, 146, 153, 116],
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[168, 142, 112, 128, 126, 143, 121],
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[169, 166, 142, 149, 126, 131, 114],
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[159, 156, 109, 127, 94, 117, 112],
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[164, 128, 63, 87, 76, 89, 90],
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# fmt: on
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],
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delta=1,
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)
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def test_radius_1_5() -> None:
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assert_blur(
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sample,
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1.5,
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[
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# fmt: off
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[155, 120, 105, 112, 124, 137, 130],
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[160, 136, 124, 125, 127, 134, 130],
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[166, 147, 130, 125, 120, 121, 119],
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[168, 145, 119, 109, 103, 105, 110],
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[168, 134, 96, 85, 85, 89, 97],
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# fmt: on
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],
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delta=1,
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)
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def test_radius_bigger_then_half() -> None:
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assert_blur(
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sample,
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3,
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[
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# fmt: off
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[144, 145, 142, 128, 114, 115, 117],
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[148, 145, 137, 122, 109, 111, 112],
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[152, 145, 131, 117, 103, 107, 108],
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[156, 144, 126, 111, 97, 102, 103],
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[160, 144, 121, 106, 92, 98, 99],
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# fmt: on
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],
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delta=1,
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)
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def test_radius_bigger_then_width() -> None:
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assert_blur(
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sample,
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10,
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[
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[158, 153, 147, 141, 135, 129, 123],
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[159, 153, 147, 141, 136, 130, 124],
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[159, 154, 148, 142, 136, 130, 124],
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[160, 154, 148, 142, 137, 131, 125],
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[160, 155, 149, 143, 137, 131, 125],
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],
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delta=0,
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)
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def test_extreme_large_radius() -> None:
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assert_blur(
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sample,
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600,
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[
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[162, 162, 162, 162, 162, 162, 162],
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[162, 162, 162, 162, 162, 162, 162],
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[162, 162, 162, 162, 162, 162, 162],
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[162, 162, 162, 162, 162, 162, 162],
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[162, 162, 162, 162, 162, 162, 162],
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],
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delta=1,
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)
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def test_two_passes() -> None:
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assert_blur(
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sample,
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1,
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[
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# fmt: off
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[153, 123, 102, 109, 132, 135, 129],
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[159, 138, 123, 121, 133, 131, 126],
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[162, 147, 136, 124, 127, 121, 121],
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[159, 140, 125, 108, 111, 106, 108],
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[154, 126, 105, 87, 94, 93, 97],
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# fmt: on
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],
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passes=2,
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delta=1,
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)
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def test_three_passes() -> None:
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assert_blur(
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sample,
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1,
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[
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# fmt: off
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[146, 131, 116, 118, 126, 131, 130],
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[151, 138, 125, 123, 126, 128, 127],
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[154, 143, 129, 123, 120, 120, 119],
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[152, 139, 122, 113, 108, 108, 108],
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[148, 132, 112, 102, 97, 99, 100],
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# fmt: on
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],
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passes=3,
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delta=1,
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)
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