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#!/usr/bin/python
# coding=utf-8
#
# build.py - Amiri font build utility
#
# Written in 2010-2011 by Khaled Hosny <khaledhosny@eglug.org>
#
# To the extent possible under law, the author have dedicated all copyright
# and related and neighboring rights to this software to the public domain
# worldwide. This software is distributed without any warranty.
#
# You should have received a copy of the CC0 Public Domain Dedication along
# with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
import fontforge
import psMat
import sys
import os
import getopt
from tempfile import mkstemp
from fontTools.ttLib import TTFont
def genCSS(font, base):
"""Generates a CSS snippet for webfont usage based on:
http://www.fontspring.com/blog/the-new-bulletproof-font-face-syntax"""
style = ("slanted" in font.fullname.lower()) and "oblique" or "normal"
weight = font.os2_weight
family = font.familyname + "Web"
css = """
@font-face {
font-family: %(family)s;
font-style: %(style)s;
font-weight: %(weight)s;
src: url('%(base)s.eot?') format('eot'),
url('%(base)s.woff') format('woff'),
url('%(base)s.ttf') format('truetype');
}
""" %{"style":style, "weight":weight, "family":family, "base":base}
return css
def cleanAnchors(font):
"""Removes anchor classes (and associated lookups) that are used only
internally for building composite glyph."""
klasses = (
"Dash",
"DigitAbove",
"DigitBelow",
"DotAbove",
"DotAlt",
"DotBelow",
"DotBelowAlt",
"DotHmaza",
"HamzaBelow",
"HighHamza",
"MarkDotAbove",
"MarkDotBelow",
"RingBelow",
"RingDash",
"Stroke",
"TaaAbove",
"TaaBelow",
"Tail",
"TashkilAboveDot",
"TashkilBelowDot",
"TwoDotsAbove",
"TwoDotsBelow",
"TwoDotsBelowAlt",
"VAbove",
)
for klass in klasses:
subtable = font.getSubtableOfAnchor(klass)
lookup = font.getLookupOfSubtable(subtable)
font.removeLookup(lookup)
def flattenNestedReferences(font, ref, new_transform=None):
"""Flattens nested references by replacing them with the ultimate reference
and applying any transformation matrices involved, so that the final font
has only simple composite glyphs. This to work around what seems to be an
Apple bug that results in ignoring transformation matrix of nested
references."""
name = ref[0]
transform = ref[1]
glyph = font[name]
new_ref = []
if glyph.references and glyph.foreground.isEmpty():
for nested_ref in glyph.references:
for i in flattenNestedReferences(font, nested_ref, transform):
new_ref.append(i)
else:
if new_transform:
matrix = psMat.compose(transform, new_transform)
new_ref.append((name, matrix))
else:
new_ref.append(ref)
return new_ref
def validateGlyphs(font):
"""Fixes some common FontForge validation warnings, currently handles:
* wrong direction
* flipped references
* missing points at extrema
In addition to flattening nested references."""
wrong_dir = 0x8
flipped_ref = 0x10
missing_extrema = 0x20
for glyph in font.glyphs():
state = glyph.validate(True)
refs = []
if state & flipped_ref:
glyph.unlinkRef()
glyph.correctDirection()
if state & wrong_dir:
glyph.correctDirection()
if state & missing_extrema:
glyph.addExtrema("all")
for ref in glyph.references:
for i in flattenNestedReferences(font, ref):
refs.append(i)
if refs:
glyph.references = refs
def setVersion(font, version):
font.version = "%07.3f" % float(version)
for name in font.sfnt_names:
if name[0] == "Arabic (Egypt)" and name[1] == "Version":
font.appendSFNTName(name[0], name[1],
name[2].replace("VERSION", font.version.replace(".", "\xD9\xAB")))
def mergeFeatures(font, feafile):
"""Merges feature file into the font while making sure mark positioning
lookups (already in the font) come after kerning lookups (from the feature
file), which is required by Uniscribe to get correct mark positioning for
kerned glyphs."""
oldfea = mkstemp(suffix='.fea')[1]
font.generateFeatureFile(oldfea)
for lookup in font.gpos_lookups:
font.removeLookup(lookup)
font.mergeFeature(feafile)
font.mergeFeature(oldfea)
os.remove(oldfea)
def makeCss(infiles, outfile):
"""Builds a CSS file for the entire font family."""
css = ""
for f in infiles.split():
base = os.path.splitext(os.path.basename(f))[0]
font = fontforge.open(f)
css += genCSS(font, base)
font.close()
out = open(outfile, "w")
out.write(css)
out.close()
def generateFont(font, outfile, hack=False):
flags = ("opentype", "dummy-dsig", "round")
if hack:
# ff takes long to write the file, so generate to tmp file then rename
# it to keep fontview happy
import subprocess
tmpout = mkstemp(dir=".", suffix=os.path.basename(outfile))[1]
font.generate(tmpout, flags=flags)
#os.rename(tmpout, outfile) # file monitor will not see this, why?
p = subprocess.Popen("cat %s > %s" %(tmpout, outfile), shell=True)
p.wait()
os.remove(tmpout)
else:
font.generate(outfile, flags=flags)
font.close()
def drawOverUnderline(glyph, pos, thickness, width):
pen = glyph.glyphPen()
pen.moveTo((-50, pos))
pen.lineTo((-50, pos + thickness))
pen.lineTo((width + 50, pos + thickness))
pen.lineTo((width + 50, pos))
pen.closePath()
def makeOverUnderline(font):
# test string:
# صِ̅فْ̅ ̅خَ̅ل̅قَ̅ ̅بًّ̅ صِ̲فْ̲ ̲خَ̲ل̲قَ̲ ̲بِ̲
thickness = font.uwidth # underline width (thickness)
o_pos = font.os2_typoascent
u_pos = font.upos - thickness # underline pos
minwidth = 100.0
widths = {}
for glyph in font.glyphs():
if glyph.glyphclass == 'baseglyph':
width = round(glyph.width/100) * 100
width = width > minwidth and width or minwidth
if not width in widths:
widths[width] = []
widths[width].append(glyph.glyphname)
o_encoded = font.createChar(0x0305, 'uni0305')
u_encoded = font.createChar(0x0332, 'uni0332')
o_encoded.width = u_encoded.width = 0
o_encoded.glyphclass = u_encoded.glyphclass = 'mark'
drawOverUnderline(o_encoded, o_pos, thickness, 500)
drawOverUnderline(u_encoded, u_pos, thickness, 500)
o_base = font.createChar(-1, 'uni0305.0')
u_base = font.createChar(-1, 'uni0332.0')
o_base.width = u_base.width = 0
o_base.glyphclass = u_base.glyphclass = 'baseglyph'
drawOverUnderline(o_base, o_pos, thickness, 500)
drawOverUnderline(u_base, u_pos, thickness, 500)
font.addLookup('mark hack', 'gsub_single', (), (("mark",(("arab",("dflt")),)),), font.gsub_lookups[-1])
font.addLookupSubtable('mark hack', 'mark hack 1')
o_encoded.addPosSub('mark hack 1', o_base.glyphname)
u_encoded.addPosSub('mark hack 1', u_base.glyphname)
context_lookup_name = 'OverUnderLine'
font.addLookup(context_lookup_name, 'gsub_contextchain', ('ignore_marks'), (("mark",(("arab",("dflt")),)),), font.gsub_lookups[-1])
for width in sorted(widths.keys()):
o_name = 'uni0305.%d' % width
u_name = 'uni0332.%d' % width
o_glyph = font.createChar(-1, o_name)
u_glyph = font.createChar(-1, u_name)
o_glyph.glyphclass = u_glyph.glyphclass = 'mark'
drawOverUnderline(o_glyph, o_pos, thickness, width)
drawOverUnderline(u_glyph, u_pos, thickness, width)
single_lookup_name = str(width)
font.addLookup(single_lookup_name, 'gsub_single', (), (), font.gsub_lookups[-1])
font.addLookupSubtable(single_lookup_name, single_lookup_name + '1')
o_base.addPosSub(single_lookup_name + '1', o_name)
u_base.addPosSub(single_lookup_name + '1', u_name)
rule = '| [%s] [%s %s] @<%s> | ' %(" ".join(widths[width]), o_base.glyphname, u_base.glyphname, single_lookup_name)
font.addContextualSubtable(context_lookup_name, context_lookup_name + str(width), 'coverage', rule)
def makeWeb(infile, outfile):
"""If we are building a web version then try to minimise file size"""
# "short-post" generates a post table without glyph names to save some KBs
# since glyph names are only needed for PDF's as readers use them to
# "guess" characters when copying text, which is of little use in web fonts.
flags = ("opentype", "short-post")
font = fontforge.open(infile)
# removed compatibility glyphs that of little use on the web
compat_ranges = (
(0xfb50, 0xfbb1),
(0xfbd3, 0xfd3d),
(0xfd50, 0xfdf9),
(0xfdfc, 0xfdfc),
(0xfe70, 0xfefc),
)
for glyph in font.glyphs():
for i in compat_ranges:
start = i[0]
end = i[1]
if start <= glyph.unicode <= end:
font.removeGlyph(glyph)
break
tmpfont = mkstemp(suffix=os.path.basename(outfile))[1]
font.generate(tmpfont, flags=flags)
font.close()
# now open in fontTools
font = TTFont(tmpfont, recalcBBoxes=0)
# our 'name' table is a bit bulky, and of almost no use in for web fonts,
# so we strip all unnecessary entries.
name = font['name']
names = []
for record in name.names:
platID = record.platformID
langID = record.langID
nameID = record.nameID
# we keep only en_US entries in Windows and Mac platform id, every
# thing else is dropped
if (platID == 1 and langID == 0) or (platID == 3 and langID == 1033):
if nameID == 13:
# the full OFL text is too much, replace it with a simple
# string
if platID == 3:
# MS strings are UTF-16 encoded
text = 'OFL v1.1'.encode('utf_16_be')
else:
text = 'OFL v1.1'
record.string = text
names.append(record)
# keep every thing else except Descriptor, Sample Text
elif nameID not in (10, 19):
names.append(record)
name.names = names
# FFTM is FontForge specific, remove it
del(font['FFTM'])
# force compiling GPOS/GSUB tables by fontTools, saves few tens of KBs
for tag in ('GPOS', 'GSUB'):
font[tag].compile(font)
font.save(outfile)
font.close()
os.remove(tmpfont)
def makeSlanted(infile, outfile, slant):
import math
font = fontforge.open(infile)
# compute amout of skew, magic formula copied from fontforge sources
skew = psMat.skew(-slant * math.pi/180.0)
font.selection.all()
font.transform(skew)
# fix metadata
font.italicangle = slant
font.fullname += " Slanted"
if font.weight == "Bold":
font.fontname = font.fontname.replace("Bold", "BoldSlanted")
font.appendSFNTName("Arabic (Egypt)", "SubFamily", "عريض مائل")
font.appendSFNTName("English (US)", "SubFamily", "Bold Slanted")
else:
font.fontname = font.fontname.replace("Regular", "Slanted")
font.appendSFNTName("Arabic (Egypt)", "SubFamily", "مائل")
generateFont(font, outfile)
def makeDesktop(infile, outfile, version):
font = fontforge.open(infile)
if version:
setVersion(font, version)
# remove anchors that are not needed in the production font
cleanAnchors(font)
# fix some common font issues
validateGlyphs(font)
if font.sfd_path:
feafile = os.path.splitext(font.sfd_path)[0] + '.fea'
mergeFeatures(font, feafile)
#makeOverUnderline(font)
generateFont(font, outfile, True)
def usage(extramessage, code):
if extramessage:
print extramessage
message = """Usage: %s OPTIONS...
Options:
--input=FILE file name of input font
--output=FILE file name of output font
--version=VALUE set font version to VALUE
--slant=VALUE autoslant
--css output is a CSS file
--web output is web version
-h, --help print this message and exit
""" % os.path.basename(sys.argv[0])
print message
sys.exit(code)
if __name__ == "__main__":
try:
opts, args = getopt.gnu_getopt(sys.argv[1:],
"h",
["help","input=","output=", "version=", "slant=", "css", "web"])
except getopt.GetoptError, err:
usage(str(err), -1)
infile = None
outfile = None
version = None
slant = False
css = False
web = False
for opt, arg in opts:
if opt in ("-h", "--help"):
usage("", 0)
elif opt == "--input": infile = arg
elif opt == "--output": outfile = arg
elif opt == "--version": version = arg
elif opt == "--slant": slant = float(arg)
elif opt == "--css": css = True
elif opt == "--web": web = True
if not infile:
usage("No input file", -1)
if not outfile:
usage("No output file", -1)
if css:
makeCss(infile, outfile)
elif web:
makeWeb(infile, outfile)
elif slant:
makeSlanted(infile, outfile, slant)
else:
if not version:
usage("No version specified", -1)
makeDesktop(infile, outfile, version)
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