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149 lines
4.4 KiB
Python
149 lines
4.4 KiB
Python
import pytest
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from PIL import Image
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from .helper import (
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assert_image_equal,
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assert_image_equal_tofile,
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assert_image_similar,
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hopper,
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)
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def rotate(im, mode, angle, center=None, translate=None):
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out = im.rotate(angle, center=center, translate=translate)
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assert out.mode == mode
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assert out.size == im.size # default rotate clips output
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out = im.rotate(angle, center=center, translate=translate, expand=1)
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assert out.mode == mode
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if angle % 180 == 0:
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assert out.size == im.size
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elif im.size == (0, 0):
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assert out.size == im.size
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else:
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assert out.size != im.size
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@pytest.mark.parametrize("mode", ("1", "P", "L", "RGB", "I", "F"))
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def test_mode(mode):
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im = hopper(mode)
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rotate(im, mode, 45)
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@pytest.mark.parametrize("angle", (0, 90, 180, 270))
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def test_angle(angle):
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with Image.open("Tests/images/test-card.png") as im:
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rotate(im, im.mode, angle)
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im = hopper()
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assert_image_equal(im.rotate(angle), im.rotate(angle, expand=1))
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@pytest.mark.parametrize("angle", (0, 45, 90, 180, 270))
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def test_zero(angle):
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im = Image.new("RGB", (0, 0))
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rotate(im, im.mode, angle)
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def test_resample():
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# Target image creation, inspected by eye.
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# >>> im = Image.open('Tests/images/hopper.ppm')
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# >>> im = im.rotate(45, resample=Image.Resampling.BICUBIC, expand=True)
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# >>> im.save('Tests/images/hopper_45.png')
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with Image.open("Tests/images/hopper_45.png") as target:
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for resample, epsilon in (
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(Image.Resampling.NEAREST, 10),
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(Image.Resampling.BILINEAR, 5),
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(Image.Resampling.BICUBIC, 0),
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):
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im = hopper()
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im = im.rotate(45, resample=resample, expand=True)
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assert_image_similar(im, target, epsilon)
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def test_center_0():
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im = hopper()
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im = im.rotate(45, center=(0, 0), resample=Image.Resampling.BICUBIC)
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with Image.open("Tests/images/hopper_45.png") as target:
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target_origin = target.size[1] / 2
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target = target.crop((0, target_origin, 128, target_origin + 128))
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assert_image_similar(im, target, 15)
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def test_center_14():
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im = hopper()
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im = im.rotate(45, center=(14, 14), resample=Image.Resampling.BICUBIC)
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with Image.open("Tests/images/hopper_45.png") as target:
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target_origin = target.size[1] / 2 - 14
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target = target.crop((6, target_origin, 128 + 6, target_origin + 128))
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assert_image_similar(im, target, 10)
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def test_translate():
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im = hopper()
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with Image.open("Tests/images/hopper_45.png") as target:
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target_origin = (target.size[1] / 2 - 64) - 5
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target = target.crop(
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(target_origin, target_origin, target_origin + 128, target_origin + 128)
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)
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im = im.rotate(45, translate=(5, 5), resample=Image.Resampling.BICUBIC)
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assert_image_similar(im, target, 1)
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def test_fastpath_center():
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# if the center is -1,-1 and we rotate by 90<=x<=270 the
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# resulting image should be black
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for angle in (90, 180, 270):
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im = hopper().rotate(angle, center=(-1, -1))
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assert_image_equal(im, Image.new("RGB", im.size, "black"))
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def test_fastpath_translate():
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# if we post-translate by -128
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# resulting image should be black
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for angle in (0, 90, 180, 270):
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im = hopper().rotate(angle, translate=(-128, -128))
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assert_image_equal(im, Image.new("RGB", im.size, "black"))
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def test_center():
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im = hopper()
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rotate(im, im.mode, 45, center=(0, 0))
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rotate(im, im.mode, 45, translate=(im.size[0] / 2, 0))
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rotate(im, im.mode, 45, center=(0, 0), translate=(im.size[0] / 2, 0))
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def test_rotate_no_fill():
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im = Image.new("RGB", (100, 100), "green")
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im = im.rotate(45)
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assert_image_equal_tofile(im, "Tests/images/rotate_45_no_fill.png")
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def test_rotate_with_fill():
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im = Image.new("RGB", (100, 100), "green")
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im = im.rotate(45, fillcolor="white")
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assert_image_equal_tofile(im, "Tests/images/rotate_45_with_fill.png")
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def test_alpha_rotate_no_fill():
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# Alpha images are handled differently internally
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im = Image.new("RGBA", (10, 10), "green")
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im = im.rotate(45, expand=1)
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corner = im.getpixel((0, 0))
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assert corner == (0, 0, 0, 0)
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def test_alpha_rotate_with_fill():
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# Alpha images are handled differently internally
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im = Image.new("RGBA", (10, 10), "green")
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im = im.rotate(45, expand=1, fillcolor=(255, 0, 0, 255))
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corner = im.getpixel((0, 0))
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assert corner == (255, 0, 0, 255)
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