1from __future__ import print_function, division, absolute_import
2from fontTools.misc.py23 import *
3from fontTools.misc.fixedTools import fixedToFloat, floatToFixed
4import unittest
5
6
7class FixedToolsTest(unittest.TestCase):
8
9    def test_roundtrip(self):
10        for bits in range(0, 15):
11            for value in range(-(2**(bits+1)), 2**(bits+1)):
12                self.assertEqual(value, floatToFixed(fixedToFloat(value, bits), bits))
13
14    def test_fixedToFloat_precision14(self):
15        self.assertEqual(0.8, fixedToFloat(13107, 14))
16        self.assertEqual(0.0, fixedToFloat(0, 14))
17        self.assertEqual(1.0, fixedToFloat(16384, 14))
18        self.assertEqual(-1.0, fixedToFloat(-16384, 14))
19        self.assertEqual(0.99994, fixedToFloat(16383, 14))
20        self.assertEqual(-0.99994, fixedToFloat(-16383, 14))
21
22    def test_fixedToFloat_precision6(self):
23        self.assertAlmostEqual(-9.98, fixedToFloat(-639, 6))
24        self.assertAlmostEqual(-10.0, fixedToFloat(-640, 6))
25        self.assertAlmostEqual(9.98, fixedToFloat(639, 6))
26        self.assertAlmostEqual(10.0, fixedToFloat(640, 6))
27
28    def test_floatToFixed_precision14(self):
29        self.assertEqual(13107, floatToFixed(0.8, 14))
30        self.assertEqual(16384, floatToFixed(1.0, 14))
31        self.assertEqual(16384, floatToFixed(1, 14))
32        self.assertEqual(-16384, floatToFixed(-1.0, 14))
33        self.assertEqual(-16384, floatToFixed(-1, 14))
34        self.assertEqual(0, floatToFixed(0, 14))
35
36    def test_fixedToFloat_return_float(self):
37        value = fixedToFloat(16384, 14)
38        self.assertIsInstance(value, float)
39
40
41if __name__ == "__main__":
42    import sys
43    sys.exit(unittest.main())
44