79 lines
2.6 KiB
Python
Executable File
79 lines
2.6 KiB
Python
Executable File
#!/usr/bin/python
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import unittest
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import math
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#import logging
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#logging.basicConfig(level = logging.DEBUG)
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from gi.repository import Vips
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# an expanding zip ... if either of the args is a scalar or a one-element list,
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# duplicate it down the other side
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def zip_expand(x, y):
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# handle singleton list case
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if isinstance(x, list) and len(x) == 1:
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x = x[0]
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if isinstance(y, list) and len(y) == 1:
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y = y[0]
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if isinstance(x, list) and isinstance(y, list):
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return list(zip(x, y))
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elif isinstance(x, list):
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return [[i, y] for i in x]
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elif isinstance(y, list):
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return [[x, j] for j in y]
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else:
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return [[x, y]]
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class TestResample(unittest.TestCase):
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# test a pair of things which can be lists for approx. equality
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def assertAlmostEqualObjects(self, a, b, places = 4, msg = ''):
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# print 'assertAlmostEqualObjects %s = %s' % (a, b)
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for x, y in zip_expand(a, b):
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self.assertAlmostEqual(x, y, places = places, msg = msg)
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def test_affine(self):
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im = Vips.Image.new_from_file("images/IMG_4618.jpg")
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# vsqbs is non-interpolatory, don't test this way
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for name in ["nearest", "bicubic", "bilinear", "nohalo", "lbb"]:
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x = im
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interpolate = Vips.Interpolate.new(name)
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for i in range(4):
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# 90 degree rotate
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x = x.affine([0, -1, 1, 0], interpolate = interpolate)
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self.assertEqual((x - im).abs().max(), 0)
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def test_resize(self):
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im = Vips.Image.new_from_file("images/IMG_4618.jpg")
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im2 = im.resize(0.25)
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self.assertEqual(im2.width, im.width // 4)
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self.assertEqual(im2.height, im.height // 4)
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def test_shrink(self):
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im = Vips.Image.new_from_file("images/IMG_4618.jpg")
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im2 = im.shrink(4, 4)
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self.assertEqual(im2.width, im.width // 4)
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self.assertEqual(im2.height, im.height // 4)
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def test_similarity(self):
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im = Vips.Image.new_from_file("images/IMG_4618.jpg")
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im2 = im.similarity(angle = 90)
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im3 = im.affine([0, -1, 1, 0])
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# rounding in calculating the affine transform from the angle stops this
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# being exactly true
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self.assertTrue((im2 - im3).abs().max() < 50)
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def test_similarity_scale(self):
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im = Vips.Image.new_from_file("images/IMG_4618.jpg")
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im2 = im.similarity(scale = 2)
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im3 = im.affine([2, 0, 0, 2])
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im2.write_to_file("im2.v")
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im3.write_to_file("im3.v")
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self.assertEqual((im2 - im3).abs().max(), 0)
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if __name__ == '__main__':
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unittest.main()
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