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https://github.com/python-pillow/Pillow.git
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4de5477b61
With the introduction and use of pytest, it is simple and easy to
execute specific tests in isolation through documented command line
arguments. Either by specifying the module path or through the `-k
EXPRESSION` argument. There is no longer any need to provide the
boilerplate:
if __name__ == '__main__':
unittest.main()
To every test file. It is simply noise.
The pattern remains in test files that aren't named with `test_*` as
those files are not discovered and executed by pytest by default.
105 lines
3.1 KiB
Python
105 lines
3.1 KiB
Python
from .helper import PillowTestCase, hopper
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from PIL import Image
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class TestImageCrop(PillowTestCase):
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def test_crop(self):
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def crop(mode):
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im = hopper(mode)
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self.assert_image_equal(im.crop(), im)
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cropped = im.crop((50, 50, 100, 100))
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self.assertEqual(cropped.mode, mode)
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self.assertEqual(cropped.size, (50, 50))
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for mode in "1", "P", "L", "RGB", "I", "F":
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crop(mode)
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def test_wide_crop(self):
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def crop(*bbox):
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i = im.crop(bbox)
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h = i.histogram()
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while h and not h[-1]:
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del h[-1]
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return tuple(h)
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im = Image.new("L", (100, 100), 1)
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self.assertEqual(crop(0, 0, 100, 100), (0, 10000))
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self.assertEqual(crop(25, 25, 75, 75), (0, 2500))
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# sides
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self.assertEqual(crop(-25, 0, 25, 50), (1250, 1250))
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self.assertEqual(crop(0, -25, 50, 25), (1250, 1250))
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self.assertEqual(crop(75, 0, 125, 50), (1250, 1250))
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self.assertEqual(crop(0, 75, 50, 125), (1250, 1250))
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self.assertEqual(crop(-25, 25, 125, 75), (2500, 5000))
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self.assertEqual(crop(25, -25, 75, 125), (2500, 5000))
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# corners
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self.assertEqual(crop(-25, -25, 25, 25), (1875, 625))
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self.assertEqual(crop(75, -25, 125, 25), (1875, 625))
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self.assertEqual(crop(75, 75, 125, 125), (1875, 625))
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self.assertEqual(crop(-25, 75, 25, 125), (1875, 625))
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def test_negative_crop(self):
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# Check negative crop size (@PIL171)
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im = Image.new("L", (512, 512))
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im = im.crop((400, 400, 200, 200))
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self.assertEqual(im.size, (0, 0))
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self.assertEqual(len(im.getdata()), 0)
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self.assertRaises(IndexError, lambda: im.getdata()[0])
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def test_crop_float(self):
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# Check cropping floats are rounded to nearest integer
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# https://github.com/python-pillow/Pillow/issues/1744
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# Arrange
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im = Image.new("RGB", (10, 10))
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self.assertEqual(im.size, (10, 10))
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# Act
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cropped = im.crop((0.9, 1.1, 4.2, 5.8))
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# Assert
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self.assertEqual(cropped.size, (3, 5))
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def test_crop_crash(self):
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# Image.crop crashes prepatch with an access violation
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# apparently a use after free on windows, see
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# https://github.com/python-pillow/Pillow/issues/1077
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test_img = 'Tests/images/bmp/g/pal8-0.bmp'
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extents = (1, 1, 10, 10)
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# works prepatch
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img = Image.open(test_img)
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img2 = img.crop(extents)
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img2.load()
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# fail prepatch
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img = Image.open(test_img)
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img = img.crop(extents)
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img.load()
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def test_crop_zero(self):
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im = Image.new('RGB', (0, 0), 'white')
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cropped = im.crop((0, 0, 0, 0))
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self.assertEqual(cropped.size, (0, 0))
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cropped = im.crop((10, 10, 20, 20))
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self.assertEqual(cropped.size, (10, 10))
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self.assertEqual(cropped.getdata()[0], (0, 0, 0))
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im = Image.new('RGB', (0, 0))
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cropped = im.crop((10, 10, 20, 20))
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self.assertEqual(cropped.size, (10, 10))
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self.assertEqual(cropped.getdata()[2], (0, 0, 0))
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