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test for regression

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homm 2016-10-10 22:59:08 +03:00
parent dc1fae26c2
commit 22e3ae3ee4
1 changed files with 11 additions and 0 deletions
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Tests/test_image_resample.py
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@ -336,6 +336,17 @@ class CoreResampleCoefficientsTest(PillowTestCase):
self.assertEqual(test_color // 2, px[2, 0])
# print '\r>', size, test_color // 2, px[2, 0]
def test_nonzero_coefficients(self):
# regression test for the wrong coefficients calculation
# due to bug https://github.com/python-pillow/Pillow/issues/2161
im = Image.new('RGBA', (1280, 1280), (0x20, 0x40, 0x60, 0xff))
histogram = im.resize((256, 256), Image.BICUBIC).histogram()
self.assertEqual(histogram[0x100 * 0 + 0x20], 0x10000) # first channel
self.assertEqual(histogram[0x100 * 1 + 0x40], 0x10000) # second channel
self.assertEqual(histogram[0x100 * 2 + 0x60], 0x10000) # third channel
self.assertEqual(histogram[0x100 * 3 + 0xff], 0x10000) # fourth channel
if __name__ == '__main__':
unittest.main()