Add a script to rename fonts for SDK. [DO NOT MERGE]

Create a script that will rename the PS name encoded in the font that is
to be shipped with the SDK.

This commit is a combination of 5 commits:
e0660d31c256e02e5f5e2967508a7205d1f62f86
7e149f02c4e4403101e7e0e88af36cd4ab6f3554
66d3314301a8983c7070a15ea68daacc7300b7f2
c6364fd90de1600526d3431ce0740b6b856e48f0
2d8c52dc4502b8407705d5b6efe628cb657b20b4

Change-Id: I675a98db39fea4525e3673656af1764eb7e5bb96

tools/layoutlib/rename_font/README

@@ -0,0 +1,9 @@
+This tool is used to rename the PS name encoded inside the ttf font that we ship
+with the SDK. There is bug in Java that returns incorrect results for
+java.awt.Font#layoutGlyphVector() if two fonts with same name but differnt
+versions are loaded. As a workaround, we rename all the fonts that we ship with
+the SDK by appending the font version to its name.
+
+
+The build_font.py copies all files from input_dir to output_dir while renaming
+the font files (*.ttf) in the process.

tools/layoutlib/rename_font/build_font.py

@@ -0,0 +1,154 @@
+#!/usr/bin/env python
+
+# Copyright (C) 2014 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the 'License');
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an 'AS IS' BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Rename the PS name of all fonts in the input directories and copy them to the
+output directory.
+
+Usage: build_font.py /path/to/input_fonts1/ /path/to/input_fonts2/ /path/to/output_fonts/
+
+"""
+
+import sys
+# fontTools is available at platform/external/fonttools
+from fontTools import ttx
+import re
+import os
+import xml.etree.ElementTree as etree
+import shutil
+import glob
+from multiprocessing import Pool
+
+# global variable
+dest_dir = '/tmp'
+
+def main(argv):
+  if len(argv) < 2:
+    sys.exit('Usage: build_font.py /path/to/input_fonts/ /path/to/out/dir/')
+  for directory in argv:
+    if not os.path.isdir(directory):
+      sys.exit(directory + ' is not a valid directory')
+  global dest_dir
+  dest_dir = argv[-1]
+  src_dirs = argv[:-1]
+  cwd = os.getcwd()
+  os.chdir(dest_dir)
+  files = glob.glob('*')
+  for filename in files:
+    os.remove(filename)
+  os.chdir(cwd)
+  input_fonts = list()
+  for src_dir in src_dirs:
+    for dirname, dirnames, filenames in os.walk(src_dir):
+      for filename in filenames:
+          input_path = os.path.join(dirname, filename)
+          extension = os.path.splitext(filename)[1].lower()
+          if (extension == '.ttf'):
+            input_fonts.append(input_path)
+          elif (extension == '.xml'):
+            shutil.copy(input_path, dest_dir)
+      if '.git' in dirnames:
+          # don't go into any .git directories.
+          dirnames.remove('.git')
+  # Create as many threads as the number of CPUs
+  pool = Pool(processes=None)
+  pool.map(convert_font, input_fonts)
+
+
+class InvalidFontException(Exception):
+  pass
+
+def convert_font(input_path):
+  filename = os.path.basename(input_path)
+  print 'Converting font: ' + filename
+  # the path to the output file. The file name is the fontfilename.ttx
+  ttx_path = os.path.join(dest_dir, filename)
+  ttx_path = ttx_path[:-1] + 'x'
+  try:
+    # run ttx to generate an xml file in the output folder which represents all
+    # its info
+    ttx_args = ['-q', '-d', dest_dir, input_path]
+    ttx.main(ttx_args)
+    # now parse the xml file to change its PS name.
+    tree = etree.parse(ttx_path)
+    root = tree.getroot()
+    for name in root.iter('name'):
+      [old_ps_name, version] = get_font_info(name)
+      if old_ps_name is not None and version is not None:
+        new_ps_name = old_ps_name + version
+        update_name(name, new_ps_name)
+    tree.write(ttx_path, xml_declaration=True, encoding='utf-8' )
+    # generate the udpated font now.
+    ttx_args = ['-q', '-d', dest_dir, ttx_path]
+    ttx.main(ttx_args)
+  except InvalidFontException:
+    # In case of invalid fonts, we exit.
+    print filename + ' is not a valid font'
+    raise
+  except Exception as e:
+    print 'Error converting font: ' + filename
+    print e
+    # Some fonts are too big to be handled by the ttx library.
+    # Just copy paste them.
+    shutil.copy(input_path, dest_dir)
+  try:
+    # delete the temp ttx file is it exists.
+    os.remove(ttx_path)
+  except OSError:
+    pass
+
+def get_font_info(tag):
+  ps_name = None
+  ps_version = None
+  for namerecord in tag.iter('namerecord'):
+    if 'nameID' in namerecord.attrib:
+      # if the tag has nameID=6, it is the postscript name of the font.
+      # see: http://scripts.sil.org/cms/scripts/page.php?item_id=IWS-Chapter08#3054f18b
+      if namerecord.attrib['nameID'] == '6':
+        if ps_name is not None:
+          if not sanitize(namerecord.text) == ps_name:
+            raise InvalidFontException('found multiple possibilities of the font name')
+        else:
+          ps_name = sanitize(namerecord.text)
+      # nameID=5 means the font version
+      if namerecord.attrib['nameID'] == '5':
+        if ps_version is not None:
+          if not ps_version == get_version(namerecord.text):
+            raise InvalidFontException('found multiple possibilities of the font version')
+        else:
+          ps_version = get_version(namerecord.text)
+  return [ps_name, ps_version]
+
+
+def update_name(tag, name):
+  for namerecord in tag.iter('namerecord'):
+    if 'nameID' in namerecord.attrib:
+      if namerecord.attrib['nameID'] == '6':
+        namerecord.text = name
+
+def sanitize(string):
+  return re.sub(r'[^\w-]+', '', string)
+
+def get_version(string):
+  # The string must begin with 'Version n.nn '
+  # to extract n.nn, we return the second entry in the split strings.
+  string = string.strip()
+  if not string.startswith('Version '):
+    raise InvalidFontException('mal-formed font version')
+  return sanitize(string.split()[1])
+
+if __name__ == '__main__':
+  main(sys.argv[1:])

tools/layoutlib/rename_font/test.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+
+"""Tests build_font.py by renaming a font.
+
+The test copies Roboto-Regular.ttf to a tmp directory and ask build_font.py to rename it and put in another dir.
+We then use ttx to dump the new font to its xml and check if rename was successful
+
+To test locally, use:
+PYTHONPATH="$PYTHONPATH:/path/to/android/checkout/external/fonttools/Lib" ./test.py
+"""
+
+import unittest
+import build_font
+
+from fontTools import ttx
+import os
+import xml.etree.ElementTree as etree
+import shutil
+import tempfile
+
+class MyTest(unittest.TestCase):
+  def test(self):
+    font_name = "Roboto-Regular.ttf"
+    srcdir = tempfile.mkdtemp()
+    print "srcdir: " + srcdir
+    shutil.copy(font_name, srcdir)
+    destdir = tempfile.mkdtemp()
+    print "destdir: " + destdir
+    self.assertTrue(build_font.main([srcdir, destdir]) is None)
+    out_path = os.path.join(destdir, font_name)
+    ttx.main([out_path])
+    ttx_path = out_path[:-1] + "x"
+    tree = etree.parse(ttx_path)
+    root = tree.getroot()
+    name_tag = root.find('name')
+    [f_name, f_version] = build_font.get_font_info(name_tag)
+    shutil.rmtree(srcdir)
+    shutil.rmtree(destdir)
+    self.assertEqual(f_name, "Roboto-Regular1200310")
+
+
+
+if __name__ == '__main__':
+  unittest.main()