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63 lines
1.8 KiB
Python
63 lines
1.8 KiB
Python
from __future__ import print_function
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from helper import PillowTestCase, hopper
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from PIL import TiffImagePlugin, Image
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from PIL.TiffImagePlugin import IFDRational
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from fractions import Fraction
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class Test_IFDRational(PillowTestCase):
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def _test_equal(self, num, denom, target):
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t = IFDRational(num, denom)
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self.assertEqual(target, t)
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self.assertEqual(t, target)
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def test_sanity(self):
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self._test_equal(1, 1, 1)
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self._test_equal(1, 1, Fraction(1, 1))
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self._test_equal(2, 2, 1)
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self._test_equal(1.0, 1, Fraction(1, 1))
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self._test_equal(Fraction(1, 1), 1, Fraction(1, 1))
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self._test_equal(IFDRational(1, 1), 1, 1)
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self._test_equal(1, 2, Fraction(1, 2))
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self._test_equal(1, 2, IFDRational(1, 2))
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def test_nonetype(self):
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" Fails if the _delegate function doesn't return a valid function"
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xres = IFDRational(72)
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yres = IFDRational(72)
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self.assertTrue(xres._val is not None)
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self.assertTrue(xres.numerator is not None)
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self.assertTrue(xres.denominator is not None)
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self.assertTrue(yres._val is not None)
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self.assertTrue(xres and 1)
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self.assertTrue(xres and yres)
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def test_ifd_rational_save(self):
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methods = (True, False)
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if 'libtiff_encoder' not in dir(Image.core):
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methods = (False)
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for libtiff in methods:
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TiffImagePlugin.WRITE_LIBTIFF = libtiff
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im = hopper()
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out = self.tempfile('temp.tiff')
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res = IFDRational(301, 1)
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im.save(out, dpi=(res, res), compression='raw')
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reloaded = Image.open(out)
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self.assertEqual(float(IFDRational(301, 1)),
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float(reloaded.tag_v2[282]))
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