commit 360d891bba8f2f7c78e7ab16d29033f5845cb6dc
author Jungshik Shin <jshin@chromium.org> Thu Mar 24 13:58:16 2016 -0700
committer Jungshik Shin <jshin@chromium.org> Thu Mar 24 14:05:44 2016 -0700
tree 0176626937b5871d456666b90db0b617b48b4d98
parent fabbcfdb803fa2e60de02a71d85d727cfa7172a9

Hot fix for #510: Primes need to be angled.

Transplan glyphs for U+203[2-4] (prime, double prime and triple prime)
from NotoSerif* v3 to NotoSerif v2.

v3 has upem of 1000, while v2 has upem of 2048. So, before transplating
glyphs, the glyphs for three characters are scaled up by a factor of
2048/1000. In addition, htmx table was also updated (lsb and width).

The following script was used to transplant glyphs and bump up the
version number to 1.07 from 1.06.

Note that only unhinted NotoSerif-*.ttf are updated and hinted
NotoSerif*.ttf are left alone.

------
from os import path

from nototools import fix_khmer_and_lao_coverage as merger
from nototools import font_data
from nototools import subset

from fontTools import ttLib

def make_version_str(revision):
  revision_int = int(revision)
  revision_frac = int(round((revision - revision_int) * 100))
  return 'Version ' + str(int(revision)) + '.' +  str(revision_frac).zfill(2)

def bump_version(font_file):
  font = ttLib.TTFont(font_file)
  _VERSION_ID = 5
  revision = font['head'].fontRevision
  version_str = make_version_str(revision)
  new_revision = float(int(round(revision*100)) + 1) / 100
  new_version_str = make_version_str(new_revision)
  print " " + version_str + " => " + new_version_str
  font['head'].fontRevision = new_revision
  version_id = font_data.get_name_records(font)[_VERSION_ID]
  new_version_id = new_version_str + version_id[len(version_str):]
  font_data.set_name_record(font, _VERSION_ID, new_version_id,
                            addIfMissing='win')
  font.save(font_file)

V3_DIR = "v3_generated/scaled"
V2_SRC_DIR = "v2_nohint"
DEST_DIR = "v2_nohint_fixed"

chars_to_transplant = {0x2032, 0x2033, 0x2034}
for style in ["Regular", "Italic", "Bold", "BoldItalic"]:
  font_name = "NotoSerif-%s.ttf" % style
  v2font_path = path.join(V2_SRC_DIR, font_name)
  v3font_path = path.join(V3_DIR, font_name)
  v2dest_path = path.join(DEST_DIR, font_name)
  subset.subset_font(v2font_path, v2dest_path, exclude=chars_to_transplant)
  merger.merge_chars_from_bank(v2dest_path,
                               v3font_path,
                               v2dest_path,
                               chars_to_transplant)
  bump_version(v2dest_path)