Use fonttools to set the ROUND_XY_TO_GRID bit

sources/setflag.py

@@ -1,27 +1,25 @@
-# This python script finds and replaces the flags="0x0" with flags="0x4" to set the ROUND_XY_TO_GRID bit in a TTX.
-# I'm sure this could be done in a much more efficient way, i.e. actually calling fontTools directly instead of dumping and recompiling the GLYF table with TTX
-# ... but I don't know how to do that
+# This python script finds and replaces the flags="0x0" with flags="0x4" to set the ROUND_XY_TO_GRID bit in a TTF.
+import os
+import sys
+from fontTools.ttLib import TTFont
+from fontTools.ttx import makeOutputFileName
 
-# import the modules that we need. (re is for regex)
-import os, re, sys
-
-eachTTX = sys.argv[1]
+inputTTF = sys.argv[1]
 
 # set the working directory for a shortcut
 # os.chdir('/Users/weihuang/Google Drive/Type Design/Google/Outputs/Test/Hinting')
 
 # open the source file and read it
-fh = file(eachTTX, 'r')
-subject = fh.read()
-fh.close()
-
-# create the pattern object. Note the "r". In case you're unfamiliar with Python
-# this is to set the string as raw so we don't have to escape our escape characters
-pattern = re.compile(r'<component (.+)flags="(0x0)"(.+)')
-# do the replace
-result = pattern.sub(r'<component \1flags="0x4"\3', subject)
-
-# write the file
-f_out = file(eachTTX, 'w')
-f_out.write(result)
-f_out.close()
+font = TTFont(inputTTF)
+extension = os.path.splitext(inputTTF)[1]
+if 'glyf' in font:
+    glyf = font['glyf']
+    for glyphname in glyf.glyphs:
+        glyph = glyf.glyphs[glyphname]
+        if glyph.isComposite():
+            glyph.expand(glyf)
+            for component in  glyph.components:
+                component.flags = 0x4
+            glyph.compact(glyf)
+outputTTF = makeOutputFileName(inputTTF, '', extension)
+font.save(outputTTF)