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from fontTools.ttLib import TTFont
from fontTools.ttLib.scaleUpem import scale_upem
import difflib
import os
import shutil
import sys
import tempfile
import unittest
import pytest
class ScaleUpemTest(unittest.TestCase):
def setUp(self):
self.tempdir = None
self.num_tempfiles = 0
def tearDown(self):
if self.tempdir:
shutil.rmtree(self.tempdir)
@staticmethod
def get_path(test_file_or_folder):
parent_dir = os.path.dirname(__file__)
return os.path.join(parent_dir, "data", test_file_or_folder)
def temp_path(self, suffix):
self.temp_dir()
self.num_tempfiles += 1
return os.path.join(self.tempdir,
"tmp%d%s" % (self.num_tempfiles, suffix))
def temp_dir(self):
if not self.tempdir:
self.tempdir = tempfile.mkdtemp()
def read_ttx(self, path):
lines = []
with open(path, "r", encoding="utf-8") as ttx:
for line in ttx.readlines():
# Elide ttFont attributes because ttLibVersion may change.
if line.startswith("<ttFont "):
lines.append("<ttFont>\n")
else:
lines.append(line.rstrip() + "\n")
return lines
def expect_ttx(self, font, expected_ttx, tables):
path = self.temp_path(suffix=".ttx")
font.saveXML(path, tables=tables)
actual = self.read_ttx(path)
expected = self.read_ttx(expected_ttx)
if actual != expected:
for line in difflib.unified_diff(
expected, actual, fromfile=expected_ttx, tofile=path):
sys.stdout.write(line)
self.fail("TTX output is different from expected")
def test_scale_upem_ttf(self):
font = TTFont(self.get_path("I.ttf"))
tables = [table_tag for table_tag in font.keys() if table_tag != "head"]
scale_upem(font, 512)
expected_ttx_path = self.get_path("I-512upem.ttx")
self.expect_ttx(font, expected_ttx_path, tables)
def test_scale_upem_otf(self):
# Just test that it doesn't crash
font = TTFont(self.get_path("TestVGID-Regular.otf"))
scale_upem(font, 500)
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