Extracts TTF to individual glyphs

ttf2png.py

#!/usr/bin/env python3

import sys
import os
import subprocess

from itertools import chain
from fontTools.ttLib import TTFont
from fontTools.unicode import Unicode

def usage():
    print("{0} usage: ".format(sys.argv[0]))
    print("{0} <ttf> [output_folder_name]".format(sys.argv[0]))

def main():
    argc = len(sys.argv)
    size = 16

    if argc < 2 or argc > 3:
        usage()
        sys.exit(1)
    
    ttf_file = sys.argv[1]

    if argc == 3:
        out_folder = sys.argv[2]
    else:
        out_folder = os.path.splitext(ttf_file)[0].split('/')[-1]
    
    if not os.path.exists(out_folder):
        os.mkdir(out_folder)

    if not os.path.isfile(ttf_file):
        print("{0} does not exist".format(ttf_file))
        usage()
        sys.exit(1)

    ttf = TTFont(ttf_file, allowVID=0, ignoreDecompileErrors=True, fontNumber=-1)

    chars = chain.from_iterable([y + (Unicode[y[0]],) for y in x.cmap.items()] for x in ttf["cmap"].tables)
    for c in list(chars):
        out_png = "{0}/{1}.png".format(out_folder, c[2])
        char = chr(c[0])
        if c[1] not in ['NUL', 'STX', 'HT', 'LF', 'space', 'nonmarkingreturn']:
            args = ["convert", "-font", ttf_file, "-pointsize", str(size), "-background", "black", "-fill", "white", '''label:{0}'''.format(char), out_png]
            subprocess.call(args)

    ttf.close()

if __name__ == "__main__":
    main()