xref: /aosp_15_r20/external/fonttools/Tests/misc/fixedTools_test.py (revision e1fe3e4ad2793916b15cccdc4a7da52a7e1dd0e9) 
1from fontTools.misc.fixedTools import (
2    fixedToFloat,
3    floatToFixed,
4    floatToFixedToStr,
5    fixedToStr,
6    strToFixed,
7    strToFixedToFloat,
8)
9import unittest
10
11
12class FixedToolsTest(unittest.TestCase):
13    def test_roundtrip(self):
14        for bits in range(0, 15):
15            for value in range(-(2 ** (bits + 1)), 2 ** (bits + 1)):
16                self.assertEqual(value, floatToFixed(fixedToFloat(value, bits), bits))
17
18    def test_fixedToFloat_precision14(self):
19        self.assertAlmostEqual(0.7999878, fixedToFloat(13107, 14))
20        self.assertEqual(0.0, fixedToFloat(0, 14))
21        self.assertEqual(1.0, fixedToFloat(16384, 14))
22        self.assertEqual(-1.0, fixedToFloat(-16384, 14))
23        self.assertAlmostEqual(0.999939, fixedToFloat(16383, 14))
24        self.assertAlmostEqual(-0.999939, fixedToFloat(-16383, 14))
25
26    def test_fixedToFloat_precision6(self):
27        self.assertAlmostEqual(-9.984375, fixedToFloat(-639, 6))
28        self.assertAlmostEqual(-10.0, fixedToFloat(-640, 6))
29        self.assertAlmostEqual(9.984375, fixedToFloat(639, 6))
30        self.assertAlmostEqual(10.0, fixedToFloat(640, 6))
31
32    def test_fixedToStr_precision14(self):
33        self.assertEqual("0.8", fixedToStr(13107, 14))
34        self.assertEqual("0.0", fixedToStr(0, 14))
35        self.assertEqual("1.0", fixedToStr(16384, 14))
36        self.assertEqual("-1.0", fixedToStr(-16384, 14))
37        self.assertEqual("0.99994", fixedToStr(16383, 14))
38        self.assertEqual("-0.99994", fixedToStr(-16383, 14))
39
40    def test_fixedToStr_precision6(self):
41        self.assertAlmostEqual("-9.98", fixedToStr(-639, 6))
42        self.assertAlmostEqual("-10.0", fixedToStr(-640, 6))
43        self.assertAlmostEqual("9.98", fixedToStr(639, 6))
44        self.assertAlmostEqual("10.0", fixedToStr(640, 6))
45
46    def test_floatToFixed_precision14(self):
47        self.assertEqual(13107, floatToFixed(0.8, 14))
48        self.assertEqual(16384, floatToFixed(1.0, 14))
49        self.assertEqual(16384, floatToFixed(1, 14))
50        self.assertEqual(-16384, floatToFixed(-1.0, 14))
51        self.assertEqual(-16384, floatToFixed(-1, 14))
52        self.assertEqual(0, floatToFixed(0, 14))
53
54    def test_strToFixed_precision14(self):
55        self.assertEqual(13107, strToFixed("0.8", 14))
56        self.assertEqual(16384, strToFixed("1.0", 14))
57        self.assertEqual(16384, strToFixed("1", 14))
58        self.assertEqual(-16384, strToFixed("-1.0", 14))
59        self.assertEqual(-16384, strToFixed("-1", 14))
60        self.assertEqual(0, strToFixed("0", 14))
61
62    def test_strToFixedToFloat_precision14(self):
63        self.assertAlmostEqual(0.7999878, strToFixedToFloat("0.8", 14))
64        self.assertEqual(0.0, strToFixedToFloat("0", 14))
65        self.assertEqual(1.0, strToFixedToFloat("1.0", 14))
66        self.assertEqual(-1.0, strToFixedToFloat("-1.0", 14))
67        self.assertAlmostEqual(0.999939, strToFixedToFloat("0.99994", 14))
68        self.assertAlmostEqual(-0.999939, strToFixedToFloat("-0.99994", 14))
69
70    def test_floatToFixedToStr_precision14(self):
71        self.assertEqual("0.8", floatToFixedToStr(0.7999878, 14))
72        self.assertEqual("1.0", floatToFixedToStr(1.0, 14))
73        self.assertEqual("1.0", floatToFixedToStr(1, 14))
74        self.assertEqual("-1.0", floatToFixedToStr(-1.0, 14))
75        self.assertEqual("-1.0", floatToFixedToStr(-1, 14))
76        self.assertEqual("0.0", floatToFixedToStr(0, 14))
77
78    def test_fixedToFloat_return_float(self):
79        value = fixedToFloat(16384, 14)
80        self.assertIsInstance(value, float)
81
82
83if __name__ == "__main__":
84    import sys
85
86    sys.exit(unittest.main())
87