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Move fixedTools tests to unittests

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Lifted from https://github.com/behdad/fonttools/pull/287

Adds new roundtrip tests, but they are disabled.
This commit is contained in:
Sascha Brawer 2015-06-08 17:23:45 +02:00 committed by Behdad Esfahbod
parent c0eb70308b
commit 2019cfa180
2 changed files with 36 additions and 44 deletions
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44
Lib/fontTools/misc/fixedTools.py
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@ -14,31 +14,7 @@ def fixedToFloat(value, precisionBits):
that has the shortest decimal reprentation. Eg. to convert a
fixed number in a 2.14 format, use precisionBits=14. This is
pretty slow compared to a simple division. Use sporadically.
>>> "%g" % fixedToFloat(13107, 14)
'0.8'
>>> "%g" % fixedToFloat(0, 14)
'0'
>>> "%g" % fixedToFloat(0x4000, 14)
'1'
>>> "%g" % fixedToFloat(-16384, 14)
'-1'
>>> "%g" % fixedToFloat(-16383, 14)
'-0.99994'
>>> "%g" % fixedToFloat(16384, 14)
'1'
>>> "%g" % fixedToFloat(16383, 14)
'0.99994'
>>> "%g" % fixedToFloat(-639, 6)
'-9.99'
>>> "%g" % fixedToFloat(-640, 6)
'-10'
>>> "%g" % fixedToFloat(639, 6)
'9.99'
>>> "%g" % fixedToFloat(640, 6)
'10'
"""
if not value: return 0.0
scale = 1 << precisionBits
@ -66,25 +42,5 @@ def fixedToFloat(value, precisionBits):
def floatToFixed(value, precisionBits):
"""Converts a float to a fixed-point number given the number of
precisionBits. Ie. int(round(value * (1<<precisionBits))).
>>> floatToFixed(0.8, 14)
13107
>>> floatToFixed(1.0, 14)
16384
>>> floatToFixed(1, 14)
16384
>>> floatToFixed(-1.0, 14)
-16384
>>> floatToFixed(-1, 14)
-16384
>>> floatToFixed(0, 14)
0
"""
return int(round(value * (1<<precisionBits)))
if __name__ == "__main__":
import sys
import doctest
sys.exit(doctest.testmod().failed)

36
Lib/fontTools/misc/fixedTools_test.py Normal file
View File

@ -0,0 +1,36 @@
from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
from fontTools.misc.fixedTools import fixedToFloat, floatToFixed
import unittest
class FixedToolsTest(unittest.TestCase):
#def test_roundtrip(self):
# for value in range(-32768, 32768):
# self.assertEqual(value, floatToFixed(fixedToFloat(value, 14), 14))
def test_fixedToFloat_precision14(self):
self.assertEqual(0.8, fixedToFloat(13107, 14))
self.assertEqual(0.0, fixedToFloat(0, 14))
self.assertEqual(1.0, fixedToFloat(16384, 14))
self.assertEqual(-1.0, fixedToFloat(-16384, 14))
self.assertEqual(0.99994, fixedToFloat(16383, 14))
self.assertEqual(-0.99994, fixedToFloat(-16383, 14))
def test_fixedToFloat_precision6(self):
self.assertAlmostEqual(-9.99, fixedToFloat(-639, 6))
self.assertAlmostEqual(-10.0, fixedToFloat(-640, 6))
self.assertAlmostEqual(9.99, fixedToFloat(639, 6))
self.assertAlmostEqual(10.0, fixedToFloat(640, 6))
def test_floatToFixed_precision14(self):
self.assertEqual(13107, floatToFixed(0.8, 14))
self.assertEqual(16384, floatToFixed(1.0, 14))
self.assertEqual(16384, floatToFixed(1, 14))
self.assertEqual(-16384, floatToFixed(-1.0, 14))
self.assertEqual(-16384, floatToFixed(-1, 14))
self.assertEqual(0, floatToFixed(0, 14))
if __name__ == "__main__":
unittest.main()