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[GX] Add randomized test for round-trip fidelity of 'gvar' delta encoding

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This commit is contained in:
Sascha Brawer 2015-05-02 09:54:37 +02:00
parent b85ff8ed31
commit 4930366117
1 changed files with 18 additions and 0 deletions
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18
Lib/fontTools/ttLib/tables/_g_v_a_r_test.py
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@ -316,6 +316,9 @@ class GlyphVariationTest(unittest.TestCase):
self.assertEqual("01 7F 7F 81 01 7F 7F", compileDeltaValues([127, 127, 0, 0, 127, 127]))
self.assertEqual("01 7F 7F 82 01 7F 7F", compileDeltaValues([127, 127, 0, 0, 0, 127, 127]))
self.assertEqual("01 7F 7F 83 01 7F 7F", compileDeltaValues([127, 127, 0, 0, 0, 0, 127, 127]))
# bytes, zeroes
self.assertEqual("01 01 00", compileDeltaValues([1, 0]))
self.assertEqual("00 01 81", compileDeltaValues([1, 0, 0]))
# words, bytes, words: a single byte is more compact when encoded as part of the words run
self.assertEqual("42 66 66 00 02 77 77", compileDeltaValues([0x6666, 2, 0x7777]))
self.assertEqual("40 66 66 01 02 02 40 77 77", compileDeltaValues([0x6666, 2, 2, 0x7777]))
@ -327,6 +330,9 @@ class GlyphVariationTest(unittest.TestCase):
self.assertEqual("40 66 66 80 02 01 02 03", compileDeltaValues([0x6666, 0, 1, 2, 3]))
self.assertEqual("40 66 66 81 02 01 02 03", compileDeltaValues([0x6666, 0, 0, 1, 2, 3]))
self.assertEqual("40 66 66 82 02 01 02 03", compileDeltaValues([0x6666, 0, 0, 0, 1, 2, 3]))
# words, zeroes
self.assertEqual("40 66 66 80", compileDeltaValues([0x6666, 0]))
self.assertEqual("40 66 66 81", compileDeltaValues([0x6666, 0, 0]))
def test_decompileDeltas(self):
decompileDeltas = GlyphVariation.decompileDeltas_
@ -340,6 +346,18 @@ class GlyphVariationTest(unittest.TestCase):
data = hexdecode("DE AD BE EF 83 40 01 02 01 81 80 DE AD BE EF")
self.assertEqual(([0, 0, 0, 0, 258, -127, -128], 11), decompileDeltas(7, data, 4))
def test_decompileDeltas_roundTrip(self):
numDeltas = 30
compile = GlyphVariation.compileDeltaValues_
decompile = lambda data: GlyphVariation.decompileDeltas_(numDeltas, data, 0)[0]
for i in xrange(50):
deltas = random.sample(xrange(-128, 127), 10)
deltas.extend(random.sample(xrange(-32768, 32767), 10))
deltas.extend([0] * 10)
random.shuffle(deltas)
self.assertListEqual(deltas, decompile(compile(deltas)),
"failed round-trip decompile/compileDeltas; deltas=%s" % deltas)
def test_getTupleSize(self):
getTupleSize = GlyphVariation.getTupleSize_
numAxes = 3