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[_g_l_y_f] add test for GlyphCoordinates' float precision loss issue (#964)

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Cosimo Lupo 2017-05-16 10:34:37 +01:00
parent 4fd719159a
commit 1c9198e3f0
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1 changed files with 10 additions and 0 deletions
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10
Tests/ttLib/tables/_g_l_y_f_test.py
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@ -143,3 +143,13 @@ class GlyphCoordinatesTest(object):
assert bool(g) == True
g = GlyphCoordinates([(0,.5), (0,0)])
assert bool(g) == True
def test_double_precision_float(self):
# https://github.com/fonttools/fonttools/issues/963
afloat = 242.50000000000003
g = GlyphCoordinates([(afloat, 0)])
g.toInt()
# this would return 242 if the internal array.array typecode is 'f',
# since the Python float is truncated to a C float.
# when using typecode 'd' it should return the correct value 243
assert g[0][0] == round(afloat)