c90-encoding-for-noto-sans-thai.py

#!/usr/local/bin/python3

# https://www.academia.edu/6647563/The_C90_encoding_for_Thai
# https://github.com/SaladLab/Unity3D.ThaiFontAdjuster/blob/master/docs/UnderTheHood.md
# https://www.thaitux.info/book/export/html/275
# https://unicodey.com/emoji-data/build/google/noto-emoji/add_svg_glyphs.py

from fontTools.ttLib import TTFont
from fontTools.ttLib.tables import _g_l_y_f
from fontTools.ttLib.tables import _v_m_t_x
from fontTools.misc.xmlWriter import XMLWriter
from pprint import pprint
import os

source = 'NotoSansThaiUI-SemiCondensedSemiBold.ttf'

font = TTFont(source)
glyph_order = font.getGlyphOrder()
cmap = font['cmap'].tables[0].cmap
hmtx = font['hmtx'].metrics
glyphs = font['glyf'].glyphs

c90 = [
  # replace top.low -> top
  (0x0E48, 'uni0E48', 'uni0E48.small'),
  (0x0E49, 'uni0E49', 'uni0E49.small'),
  (0x0E4A, 'uni0E4A', 'uni0E4A.small'),
  (0x0E4B, 'uni0E4B', 'uni0E4B.small'),
  (0x0E4C, 'uni0E4C', 'uni0E4C.small'),
  # Code	Description	C90 Category
  # U+F700	uni0E10.descless	base.descless
  (0xF700, 'uni0E10.descless', 'thoThan-thai.less'),
  # U+F701-04	uni0E34-37.left	upper.left
  (0xF701, 'uni0E34.left', 'uni0E34.narrow'),
  (0xF702, 'uni0E35.left', 'uni0E35.narrow'),
  (0xF703, 'uni0E36.left', 'uni0E36.narrow'),
  (0xF704, 'uni0E37.left', 'uni0E37.narrow'),
  # U+F705-09	uni0E48-4C.lowleft	top.lowleft
  (0xF705, 'uni0E48.lowleft', 'uni0E48.narrow'),
  (0xF706, 'uni0E49.lowleft', 'uni0E49.narrow'),
  (0xF707, 'uni0E4A.lowleft', 'uni0E4A.narrow'),
  (0xF708, 'uni0E4B.lowleft', 'maiChattawa-thai.narrow'),
  (0xF709, 'uni0E4C.lowleft', 'uni0E4C.narrow'),
  # U+F70A-0E	uni0E48-4C.low	top.low
  (0xF70A, 'uni0E48.low', 'uni0E48'),
  (0xF70B, 'uni0E49.low', 'uni0E49'),
  (0xF70C, 'uni0E4A.low', 'uni0E4A'),
  (0xF70D, 'uni0E4B.low', 'uni0E4B'),
  (0xF70E, 'uni0E4C.low', 'uni0E4C'),
  # U+F70F	uni0E0D.descless	base.descless
  (0xF70F, 'uni0E0D.descless', 'yoYing-thai.less'),
  # U+F710-12	uni0E31,4D,47.left	upper.left
  (0xF710, 'uni0E31.left', 'uni0E31.narrow'),
  (0xF711, 'uni0E4D.left', 'nikhahit-thai.narrow'),
  (0xF712, 'uni0E47.left', 'uni0E47.narrow'),
  # U+F713-17	uni0E48-4C.left	top.left
  (0xF713, 'uni0E48.left', 'uni0E48.small', True), #'nikhahit_maiEk-thai.narrow', True),
  (0xF714, 'uni0E49.left', 'uni0E49.small', True), #'nikhahit_maiTho-thai.narrow', True),
  (0xF715, 'uni0E4A.left', 'uni0E4A.small', True), #'nikhahit_maiTri-thai.narrow', True),
  (0xF716, 'uni0E4B.left', 'uni0E4B.small', True), #'nikhahit_maiChattawa-thai.narrow', True),
  (0xF717, 'uni0E4C.left', 'uni0E4C.small', True),
  # U+F718-1A	uni0E38-3A.low	lower.low
  (0xF718, 'uni0E38.low', 'uni0E38.small'),
  (0xF719, 'uni0E39.low', 'uni0E39.small'),
  (0xF71A, 'uni0E3A.low', 'uni0E3A.small'),
]

# pprint(glyphs)

for item in c90:
  if (len(item) == 3):
    cmap[item[0]] = item[2]
  else:
    cmap[item[0]] = item[1]
    hmtx[item[1]] = hmtx[item[2]]
    glyph_order.append(item[1])
    # glyphs[item[1]] = glyphs[item[2]]
    glyphs[item[1]] = _g_l_y_f.Glyph()
    glyphs[item[1]].fromXML('component', {'glyphName': item[2], 'x': '-190', 'y': '0', 'flags': '0x4' }, {}, font)

# cmap[item[0]] = item[1]
# hmtx[item[1]] = [0, 0]
# glyph_order.append(item[1])
# glyphs[item[1]] = _g_l_y_f.Glyph()

# pprint(glyphs)

# x = XMLWriter('a.xml')
# g = glyphs['nikhahit_maiEk-thai.narrow']
# g.expand(font['glyf'])
# g.toXML(x, font)

# pprint(hmtx['nikhahit_maiEk-thai'])
# pprint(hmtx['nikhahit_maiEk-thai.narrow'])

font.save(os.path.splitext(source)[0] + '-C90' + os.path.splitext(source)[1], False)