From dd4b6563cb396b47333fd7bf1d8934d67f6d6474 Mon Sep 17 00:00:00 2001
From: James Godfrey-Kittle <jamesgk@google.com>
Date: Wed, 22 Apr 2015 15:09:49 -0700
Subject: Add anchor extraction script and README note.

---
 src/v2/README.md              |  6 +++++
 src/v2/get_dropped_anchors.py | 61 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 src/v2/get_dropped_anchors.py

diff --git a/src/v2/README.md b/src/v2/README.md
index 62cc8d5..b2362d6 100644
--- a/src/v2/README.md
+++ b/src/v2/README.md
@@ -17,3 +17,9 @@ wine [path-to-vfb2ufo]/exe/vfb2ufo.exe [roboto]/src/v2/Roboto_Bold.vfb
 
 The converter should work both ways, so it is possible to convert altered UFOs
 back into VFBs which can be opened in FontLab.
+
+**Note:** There is currently an issue when converting via vfb2ufo, in which
+some anchors are dropped from glyphs. For now it is also necessary to run the
+script `get_dropped_anchors.py` through FontLab after updating the VFBs, in
+order to extract these dropped anchors into an external resource which is then
+re-incorporated into the masters during the build.
diff --git a/src/v2/get_dropped_anchors.py b/src/v2/get_dropped_anchors.py
new file mode 100644
index 0000000..4d4a19c
--- /dev/null
+++ b/src/v2/get_dropped_anchors.py
@@ -0,0 +1,61 @@
+# Copyright 2015 Google Inc. All Rights Reserved.
+#
+# 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.
+
+
+from FL import *
+
+import json
+import os
+
+
+def main():
+    """Extract anchors which will be dropped during conversion via vfb2ufo.
+
+    Specifically, these are the anchors belonging to glyphs containing
+    components but no contours. This script exports them to json files.
+    """
+
+    path = ""  # CHANGE THIS TO LOCAL ROBOTO PATH
+    if not path:
+        print "Please change the 'path' variable to your local roboto location"
+        return
+
+    # list of input fonts (master VFBs) with their respective weights
+    fonts = (
+        (os.path.join(path, "src", "v2", "Roboto_Thin.vfb"), "thin"),
+        (os.path.join(path, "src", "v2", "Roboto_Regular.vfb"), "regular"),
+        (os.path.join(path, "src", "v2", "Roboto_Bold.vfb"), "bold"))
+
+    # extract the anchors which will be dropped
+    for fontpath, weight in fonts:
+        fontData = {}
+        font = Font(fontpath)
+        for i in range(len(font)):
+            glyph = font[i]
+            if glyph.anchors and glyph.components and not glyph.nodes:
+                glyphData = {}
+                for anchor in glyph.anchors:
+                    glyphData[anchor.name] = [anchor.x, anchor.y]
+                fontData[glyph.name] = glyphData
+
+        # write the data as json
+        outpath = os.path.join(path, "res", "anchors_%s.json" % weight)
+        with open(outpath, "w") as outfile:
+            json.dump(fontData, outfile, sort_keys=True, indent=4,
+                      separators=(',', ': '))
+            print "Wrote " + outpath
+    print "Done"
+
+
+main()
-- 
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