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104 lines
3.2 KiB
Python
104 lines
3.2 KiB
Python
from PIL import Image
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from .helper import PillowTestCase, assert_image_equal, hopper
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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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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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with Image.open(test_img) as 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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with Image.open(test_img) as 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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