#!/usr/bin/env python

#

# The magic is in two places:

#

# 1. The GASP table. Vern Adams <[email protected]>

# suggests it should have value 15 for all sizes.

#

# 2. The PREP table. Raph Levien <[email protected]>

# suggests using his code to turn on 'drop out control'

#

# PUSHW_1

# 511

# SCANCTRL

# PUSHB_1

# 4

# SCANTYPE

#

# This script depends on fontTools Python library, available

# in most packaging systems and sf.net/projects/fonttools/

#

# Usage:

#

# $ ./fontbakery-fix-nonhinting.py FontIn.ttf FontOut.ttf

# Import our system library and fontTools ttLib

import argparse

import os

from fontTools import ttLib

from fontTools.ttLib.tables import ttProgram

description = 'Fixes TTF GASP table so that its program ' \

'contains the minimal recommended instructions'

parser = argparse.ArgumentParser(description=description)

parser.add_argument('fontfile_in',

nargs=1,

help="Font in OpenType (TTF/OTF) format")

parser.add_argument('fontfile_out',

nargs=1,

help="Filename for the output")

def main():

args = parser.parse_args()

# Open the font file supplied as the first argument on the command line

fontfile_in = os.path.abspath(args.fontfile_in[0])

font = ttLib.TTFont(fontfile_in)

# Save a backup

backupfont = '{}-backup-fonttools-prep-gasp{}'.format(fontfile_in[0:-4],

fontfile_in[-4:])

# print "Saving to ", backupfont

font.save(backupfont)

print backupfont, " saved."

# Print the Gasp table

if "gasp" in font:

print ("GASP was: ", font["gasp"].gaspRange)

else:

print ("GASP wasn't there")

# Print the PREP table

if "prep" in font:

old_program = ttProgram.Program.getAssembly(font["prep"].program)

print ("PREP was:\n\t" + "\n\t".join(old_program))

else:

print ("PREP wasn't there")

# Create a new GASP table

gasp = ttLib.newTable("gasp")

# Set GASP to the magic number

gasp.gaspRange = {0xFFFF: 15}

# Create a new hinting program

program = ttProgram.Program()

assembly = ['PUSHW[]',

'511',

'SCANCTRL[]',

'PUSHB[]',

'4',

'SCANTYPE[]']

program.fromAssembly(assembly)

# Create a new PREP table

prep = ttLib.newTable("prep")

# Insert the magic program into it

prep.program = program

# Add the tables to the font, replacing existing ones

font["gasp"] = gasp

font["prep"] = prep

# Print the Gasp table

print "GASP now: ", font["gasp"].gaspRange

# Print the PREP table

current_program = ttProgram.Program.getAssembly(font["prep"].program)

print ("PREP now:\n\t" + "\n\t".join(current_program))

# Save the new file with the name of the input file

fontfile_out = os.path.abspath(args.fontfile_out[0])

font.save(fontfile_out)

print fontfile_out, " saved."

if __name__ == "__main__":

main()