IUP Optimizer Test

from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
from fontTools.ttLib import TTFont

from Lib.fontTools.varLib.iup import iup_delta_optimize, _iup_contour_bound_forced_set

font = TTFont("NotoSerifHebrew-GX.ttf")
gvar = font["gvar"]
glyf = font["glyf"]
total = 0
saved = 0

for gname, g in glyf.glyphs.items():
  if g.numberOfContours < 1: continue
  points = list(g.coordinates)
  points.extend(((0,0),(0,0))*2) # Add four phantom points
  ends = g.endPtsOfContours
  for v in gvar.variations[gname]:
    optimized = iup_delta_optimize(v.coordinates, points, ends, tolerance = 0.5)
    total += len(g.coordinates)
    saved += len(list(filter(lambda x: x is None, optimized)))

print("Saved: %i/%i (%f%%)" % (saved, total, 100.0*(saved / float(total))))