font normalizer

normalize.py

# how to run:
# fontforge -lang=py -script ./normalize.py

import fontforge
from pathlib import Path

paths = list(Path(".").rglob("*.woff"))

# Constants
ascent = 800
descent = 200
xheight = 450
capheight = 700

for path in paths:
    file = str(path.resolve())
    print(file)

    font = fontforge.open(file)

    # General
    font.ascent = ascent
    font.descent = descent
    font.em = 1024

    # OS/2 -> Metrics
    font.os2_winascent = ascent
    font.os2_winascent_add = False
    font.os2_windescent = descent
    font.os2_windescent_add = False

    font.os2_use_typo_metrics = False

    font.os2_typoascent = ascent
    font.os2_typoascent_add = False
    font.os2_typodescent = -descent
    font.os2_typodescent_add = False
    font.os2_typolinegap = 0

    font.hhea_ascent = ascent
    font.hhea_ascent_add = False
    font.hhea_descent = -descent
    font.hhea_descent_add = False
    font.hhea_linegap = 0

    font.os2_capheight = capheight
    font.os2_xheight = xheight

    font.generate(file)
    font.close()