def test_win_ascent_and_win_descent_equal_bbox(self):
"""Check Win Ascent and Win Descent equal yMax, yMin of bbox
MS recommends OS/2's win Ascent and win Descent must be the ymax
and ymin of the bbox"""
family_ymax_ymin = []
for font in self.fonts:
ymin, ymax = shortest_tallest_glyphs(font)
family_ymax_ymin.append(ymin)
family_ymax_ymin.append(ymax)
ymax = max(family_ymax_ymin)
ymin = min(family_ymax_ymin)
for font in self.fonts:
for master in font.masters:
win_ascent = master.customParameters['winAscent']
win_descent = master.customParameters['winDescent']
self.assertEqual(
int(win_ascent),
ymax,
("%s master's winAscent %s is not equal to yMax %s") % (
master.name,
win_ascent,
ymax)
)
# ymin is abs because win descent is a positive integer
self.assertEqual(
int(win_descent),
abs(ymin),
("%s master's winDescent %s is not equal to yMin %s") % (
master.name,
win_descent,
abs(ymin))
)
def set_win_asc_win_desc_to_bbox(font):
masters = font.masters
ymin, ymax = shortest_tallest_glyphs(font)
for master in masters:
master.customParameters['winDescent'] = abs(ymin)
master.customParameters['winAscent'] = ymax