xref: /aosp_15_r20/external/fonttools/Tests/misc/fixedTools_test.py (revision e1fe3e4ad2793916b15cccdc4a7da52a7e1dd0e9) 
1*e1fe3e4aSElliott Hughesfrom fontTools.misc.fixedTools import (
2*e1fe3e4aSElliott Hughes    fixedToFloat,
3*e1fe3e4aSElliott Hughes    floatToFixed,
4*e1fe3e4aSElliott Hughes    floatToFixedToStr,
5*e1fe3e4aSElliott Hughes    fixedToStr,
6*e1fe3e4aSElliott Hughes    strToFixed,
7*e1fe3e4aSElliott Hughes    strToFixedToFloat,
8*e1fe3e4aSElliott Hughes)
9*e1fe3e4aSElliott Hughesimport unittest
10*e1fe3e4aSElliott Hughes
11*e1fe3e4aSElliott Hughes
12*e1fe3e4aSElliott Hughesclass FixedToolsTest(unittest.TestCase):
13*e1fe3e4aSElliott Hughes    def test_roundtrip(self):
14*e1fe3e4aSElliott Hughes        for bits in range(0, 15):
15*e1fe3e4aSElliott Hughes            for value in range(-(2 ** (bits + 1)), 2 ** (bits + 1)):
16*e1fe3e4aSElliott Hughes                self.assertEqual(value, floatToFixed(fixedToFloat(value, bits), bits))
17*e1fe3e4aSElliott Hughes
18*e1fe3e4aSElliott Hughes    def test_fixedToFloat_precision14(self):
19*e1fe3e4aSElliott Hughes        self.assertAlmostEqual(0.7999878, fixedToFloat(13107, 14))
20*e1fe3e4aSElliott Hughes        self.assertEqual(0.0, fixedToFloat(0, 14))
21*e1fe3e4aSElliott Hughes        self.assertEqual(1.0, fixedToFloat(16384, 14))
22*e1fe3e4aSElliott Hughes        self.assertEqual(-1.0, fixedToFloat(-16384, 14))
23*e1fe3e4aSElliott Hughes        self.assertAlmostEqual(0.999939, fixedToFloat(16383, 14))
24*e1fe3e4aSElliott Hughes        self.assertAlmostEqual(-0.999939, fixedToFloat(-16383, 14))
25*e1fe3e4aSElliott Hughes
26*e1fe3e4aSElliott Hughes    def test_fixedToFloat_precision6(self):
27*e1fe3e4aSElliott Hughes        self.assertAlmostEqual(-9.984375, fixedToFloat(-639, 6))
28*e1fe3e4aSElliott Hughes        self.assertAlmostEqual(-10.0, fixedToFloat(-640, 6))
29*e1fe3e4aSElliott Hughes        self.assertAlmostEqual(9.984375, fixedToFloat(639, 6))
30*e1fe3e4aSElliott Hughes        self.assertAlmostEqual(10.0, fixedToFloat(640, 6))
31*e1fe3e4aSElliott Hughes
32*e1fe3e4aSElliott Hughes    def test_fixedToStr_precision14(self):
33*e1fe3e4aSElliott Hughes        self.assertEqual("0.8", fixedToStr(13107, 14))
34*e1fe3e4aSElliott Hughes        self.assertEqual("0.0", fixedToStr(0, 14))
35*e1fe3e4aSElliott Hughes        self.assertEqual("1.0", fixedToStr(16384, 14))
36*e1fe3e4aSElliott Hughes        self.assertEqual("-1.0", fixedToStr(-16384, 14))
37*e1fe3e4aSElliott Hughes        self.assertEqual("0.99994", fixedToStr(16383, 14))
38*e1fe3e4aSElliott Hughes        self.assertEqual("-0.99994", fixedToStr(-16383, 14))
39*e1fe3e4aSElliott Hughes
40*e1fe3e4aSElliott Hughes    def test_fixedToStr_precision6(self):
41*e1fe3e4aSElliott Hughes        self.assertAlmostEqual("-9.98", fixedToStr(-639, 6))
42*e1fe3e4aSElliott Hughes        self.assertAlmostEqual("-10.0", fixedToStr(-640, 6))
43*e1fe3e4aSElliott Hughes        self.assertAlmostEqual("9.98", fixedToStr(639, 6))
44*e1fe3e4aSElliott Hughes        self.assertAlmostEqual("10.0", fixedToStr(640, 6))
45*e1fe3e4aSElliott Hughes
46*e1fe3e4aSElliott Hughes    def test_floatToFixed_precision14(self):
47*e1fe3e4aSElliott Hughes        self.assertEqual(13107, floatToFixed(0.8, 14))
48*e1fe3e4aSElliott Hughes        self.assertEqual(16384, floatToFixed(1.0, 14))
49*e1fe3e4aSElliott Hughes        self.assertEqual(16384, floatToFixed(1, 14))
50*e1fe3e4aSElliott Hughes        self.assertEqual(-16384, floatToFixed(-1.0, 14))
51*e1fe3e4aSElliott Hughes        self.assertEqual(-16384, floatToFixed(-1, 14))
52*e1fe3e4aSElliott Hughes        self.assertEqual(0, floatToFixed(0, 14))
53*e1fe3e4aSElliott Hughes
54*e1fe3e4aSElliott Hughes    def test_strToFixed_precision14(self):
55*e1fe3e4aSElliott Hughes        self.assertEqual(13107, strToFixed("0.8", 14))
56*e1fe3e4aSElliott Hughes        self.assertEqual(16384, strToFixed("1.0", 14))
57*e1fe3e4aSElliott Hughes        self.assertEqual(16384, strToFixed("1", 14))
58*e1fe3e4aSElliott Hughes        self.assertEqual(-16384, strToFixed("-1.0", 14))
59*e1fe3e4aSElliott Hughes        self.assertEqual(-16384, strToFixed("-1", 14))
60*e1fe3e4aSElliott Hughes        self.assertEqual(0, strToFixed("0", 14))
61*e1fe3e4aSElliott Hughes
62*e1fe3e4aSElliott Hughes    def test_strToFixedToFloat_precision14(self):
63*e1fe3e4aSElliott Hughes        self.assertAlmostEqual(0.7999878, strToFixedToFloat("0.8", 14))
64*e1fe3e4aSElliott Hughes        self.assertEqual(0.0, strToFixedToFloat("0", 14))
65*e1fe3e4aSElliott Hughes        self.assertEqual(1.0, strToFixedToFloat("1.0", 14))
66*e1fe3e4aSElliott Hughes        self.assertEqual(-1.0, strToFixedToFloat("-1.0", 14))
67*e1fe3e4aSElliott Hughes        self.assertAlmostEqual(0.999939, strToFixedToFloat("0.99994", 14))
68*e1fe3e4aSElliott Hughes        self.assertAlmostEqual(-0.999939, strToFixedToFloat("-0.99994", 14))
69*e1fe3e4aSElliott Hughes
70*e1fe3e4aSElliott Hughes    def test_floatToFixedToStr_precision14(self):
71*e1fe3e4aSElliott Hughes        self.assertEqual("0.8", floatToFixedToStr(0.7999878, 14))
72*e1fe3e4aSElliott Hughes        self.assertEqual("1.0", floatToFixedToStr(1.0, 14))
73*e1fe3e4aSElliott Hughes        self.assertEqual("1.0", floatToFixedToStr(1, 14))
74*e1fe3e4aSElliott Hughes        self.assertEqual("-1.0", floatToFixedToStr(-1.0, 14))
75*e1fe3e4aSElliott Hughes        self.assertEqual("-1.0", floatToFixedToStr(-1, 14))
76*e1fe3e4aSElliott Hughes        self.assertEqual("0.0", floatToFixedToStr(0, 14))
77*e1fe3e4aSElliott Hughes
78*e1fe3e4aSElliott Hughes    def test_fixedToFloat_return_float(self):
79*e1fe3e4aSElliott Hughes        value = fixedToFloat(16384, 14)
80*e1fe3e4aSElliott Hughes        self.assertIsInstance(value, float)
81*e1fe3e4aSElliott Hughes
82*e1fe3e4aSElliott Hughes
83*e1fe3e4aSElliott Hughesif __name__ == "__main__":
84*e1fe3e4aSElliott Hughes    import sys
85*e1fe3e4aSElliott Hughes
86*e1fe3e4aSElliott Hughes    sys.exit(unittest.main())
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