Merge pull request #9 from google/anchor-fix

Fix for dropped anchors

9 files changed, 3396 insertions, 20 deletions

diff --git a/res/anchors_bold.json b/res/anchors_bold.json
new file mode 100644
index 0000000..b8f8956
--- /dev/null
+++ b/res/anchors_bold.json
@@ -0,0 +1,1092 @@
+{
+  "Esh": {
+    "bottom": [
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+      10
+    ],
+    "top": [
+      591,
+      1600
+    ],
+    "top0315": [
+      1157,
+      1600
+    ]
+  },
+  "Gbar": {
+    "bottom": [
+      726,
+      0
+    ],
+    "top": [
+      705,
+      1600
+    ],
+    "top0315": [
+      1466,
+      1600
+    ]
+  },
+  "Ibar": {
+    "bottom": [
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+      0
+    ],
+    "top": [
+      381,
+      1600
+    ],
+    "top0315": [
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+      1600
+    ]
+  },
+  "a_uni02DE": {
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+      22
+    ],
+    "bottom_dd": [
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+      -407
+    ],
+    "markbottom": [
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+      22
+    ],
+    "ogonek": [
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+      0
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+    "rhalfring": [
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+      1290
+    ],
+    "top": [
+      540,
+      1290
+    ],
+    "top0315": [
+      1534,
+      1290
+    ],
+    "top_dd": [
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+      1600
+    ]
+  },
+  "acutedblnosp": {
+    "_marktop": [
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+      1290
+    ],
+    "mkmktop": [
+      -661,
+      1640
+    ],
+    "parent_top": [
+      -586,
+      1379
+    ]
+  },
+  "acuterightnosp": {
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+      1290
+    ],
+    "mkmktop": [
+      -105,
+      1640
+    ]
+  },
+  "acutesubnosp": {
+    "_markbottom": [
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+      0
+    ],
+    "mkmkbottom_acc": [
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+      -390
+    ]
+  },
+  "bbar": {
+    "bottom": [
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+    ],
+    "cross": [
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+      1302
+    ],
+    "markbottom": [
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+    ],
+    "top": [
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+    ],
+    "top0315": [
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+    ]
+  },
+  "bridgeinvsubnosp": {
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+      0
+    ],
+    "mkmkbottom_acc": [
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+      -486
+    ]
+  },
+  "circumflexnosp": {
+    "_marktop": [
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+    ],
+    "mkmktop": [
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+    ],
+    "parent_top": [
+      -576,
+      1389
+    ]
+  },
+  "circumflexsubnosp": {
+    "_bottom": [
+      -576,
+      0
+    ],
+    "_markbottom": [
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+      0
+    ],
+    "mkmkbottom_acc": [
+      -577,
+      -377
+    ]
+  },
+  "diaeresistonosnosp": {
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+    ],
+    "mkmktop": [
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+      1870
+    ]
+  },
+  "epsilon1": {
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+    "top": [
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+    ],
+    "top0315": [
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+    ]
+  },
+  "gbar_uni1ABE": {
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+    "cross": [
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+    ],
+    "markbottom": [
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+    "top": [
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+    ],
+    "top0315": [
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+      1290
+    ]
+  },
+  "gcursive": {
+    "bottom": [
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+    ],
+    "top": [
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+      1290
+    ],
+    "top0315": [
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+      1290
+    ]
+  },
+  "glottalstopbarrev": {
+    "bottom": [
+      558,
+      0
+    ],
+    "top": [
+      558,
+      1633
+    ],
+    "top0315": [
+      1066,
+      1633
+    ]
+  },
+  "graveleftnosp": {
+    "_marktop": [
+      32,
+      1290
+    ],
+    "mkmktop": [
+      32,
+      1640
+    ]
+  },
+  "gravesubnosp": {
+    "_markbottom": [
+      -583,
+      0
+    ],
+    "mkmkbottom_acc": [
+      -583,
+      -390
+    ]
+  },
+  "ibar": {
+    "bottom": [
+      381,
+      0
+    ],
+    "top": [
+      381,
+      1600
+    ],
+    "top0315": [
+      761,
+      1600
+    ]
+  },
+  "jhookdblbar": {
+    "bottom": [
+      204,
+      -447
+    ],
+    "top": [
+      634,
+      1700
+    ],
+    "top0315": [
+      848,
+      1700
+    ]
+  },
+  "lbar": {
+    "bottom": [
+      381,
+      10
+    ],
+    "top": [
+      381,
+      1677
+    ],
+    "top0315": [
+      761,
+      1677
+    ]
+  },
+  "linevertdblnosp": {
+    "_marktop": [
+      -580,
+      1180
+    ],
+    "mkmktop": [
+      -580,
+      1680
+    ],
+    "parent_top": [
+      -578,
+      1358
+    ]
+  },
+  "linevertnosp": {
+    "_marktop": [
+      -576,
+      1180
+    ],
+    "mkmktop": [
+      -576,
+      1680
+    ],
+    "parent_top": [
+      -576,
+      1358
+    ]
+  },
+  "linevertsubnosp": {
+    "_markbottom": [
+      -579,
+      0
+    ],
+    "mkmkbottom_acc": [
+      -579,
+      -514
+    ]
+  },
+  "lmidtilde": {
+    "bottom": [
+      420,
+      0
+    ],
+    "cross": [
+      426,
+      842
+    ],
+    "top": [
+      420,
+      1600
+    ],
+    "top0315": [
+      847,
+      1600
+    ]
+  },
+  "macronsubnosp": {
+    "_bottom": [
+      -576,
+      0
+    ],
+    "_markbottom": [
+      -576,
+      0
+    ],
+    "mkmkbottom_acc": [
+      -575,
+      -318
+    ]
+  },
+  "o_uni02DE": {
+    "bottom": [
+      576,
+      -10
+    ],
+    "bottom_dd": [
+      1153,
+      -407
+    ],
+    "markbottom": [
+      576,
+      -10
+    ],
+    "top": [
+      576,
+      1290
+    ],
+    "top0315": [
+      1606,
+      1290
+    ],
+    "top_dd": [
+      1153,
+      1600
+    ]
+  },
+  "overscorenosp": {
+    "_marktop": [
+      -572,
+      1584
+    ],
+    "mkmktop": [
+      -572,
+      1910
+    ],
+    "parent_top": [
+      -573,
+      1704
+    ]
+  },
+  "plussubnosp": {
+    "_markbottom": [
+      -578,
+      0
+    ],
+    "mkmkbottom_acc": [
+      -578,
+      -551
+    ]
+  },
+  "ringnosp": {
+    "_marktop": [
+      -575,
+      1121
+    ],
+    "mkmktop": [
+      -575,
+      1571
+    ],
+    "parent_top": [
+      -575,
+      1296
+    ]
+  },
+  "ringrighthalfsubnosp": {
+    "_markbottom": [
+      -602,
+      0
+    ],
+    "mkmkbottom_acc": [
+      -601,
+      -451
+    ]
+  },
+  "ringsubnosp": {
+    "_markbottom": [
+      -584,
+      0
+    ],
+    "mkmkbottom_acc": [
+      -584,
+      -490
+    ]
+  },
+  "tackupsubnosp": {
+    "_markbottom": [
+      -578,
+      0
+    ],
+    "mkmkbottom_acc": [
+      -578,
+      -492
+    ]
+  },
+  "tildecomb": {
+    "_marktop": [
+      -582,
+      1256
+    ],
+    "_top": [
+      -582,
+      1256
+    ],
+    "mkmktop": [
+      -582,
+      1606
+    ],
+    "parent_top": [
+      -556,
+      1398
+    ]
+  },
+  "tildesubnosp": {
+    "_bottom": [
+      -576,
+      0
+    ],
+    "_markbottom": [
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+      0
+    ],
+    "mkmkbottom_acc": [
+      -576,
+      -407
+    ]
+  },
+  "underscorenosp": {
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+      -577,
+      0
+    ],
+    "mkmkbottom_acc": [
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+      -403
+    ]
+  },
+  "uni0069.ccmp": {
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+      278,
+      10
+    ],
+    "top": [
+      289,
+      1269
+    ],
+    "top0315": [
+      577,
+      1269
+    ]
+  },
+  "uni006A.ccmp": {
+    "bottom": [
+      190,
+      -459
+    ],
+    "top": [
+      275,
+      1269
+    ],
+    "top0315": [
+      596,
+      1269
+    ]
+  },
+  "uni012F.ccmp": {
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+      -459
+    ],
+    "top": [
+      289,
+      1269
+    ],
+    "top0315": [
+      577,
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+    ]
+  },
+  "uni023D": {
+    "bottom": [
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+      10
+    ],
+    "top": [
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+      1600
+    ],
+    "top0315": [
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+      1600
+    ]
+  },
+  "uni0243": {
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+      10
+    ],
+    "top": [
+      675,
+      1612
+    ],
+    "top0315": [
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+      1612
+    ]
+  },
+  "uni0248": {
+    "bottom": [
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+      -10
+    ],
+    "top": [
+      858,
+      1600
+    ],
+    "top0315": [
+      1234,
+      1600
+    ]
+  },
+  "uni0249": {
+    "bottom": [
+      386,
+      -459
+    ],
+    "top": [
+      419,
+      1600
+    ],
+    "top0315": [
+      797,
+      1600
+    ]
+  },
+  "uni0249.ccmp": {
+    "bottom": [
+      394,
+      -459
+    ],
+    "top": [
+      394,
+      1269
+    ],
+    "top0315": [
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+      1269
+    ]
+  },
+  "uni024D": {
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+      10
+    ],
+    "top": [
+      462,
+      1290
+    ],
+    "top0315": [
+      858,
+      1290
+    ]
+  },
+  "uni0268.ccmp": {
+    "bottom": [
+      371,
+      10
+    ],
+    "top": [
+      382,
+      1269
+    ],
+    "top0315": [
+      761,
+      1269
+    ]
+  },
+  "uni0313": {
+    "_marktop": [
+      -599,
+      1069
+    ],
+    "mkmktop": [
+      -599,
+      1684
+    ],
+    "parent_top": [
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+      1303
+    ]
+  },
+  "uni0315": {
+    "_marktop0315": [
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+      1067
+    ]
+  },
+  "uni0342": {
+    "_marktop": [
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+      1290
+    ],
+    "mkmktop": [
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+      1640
+    ]
+  },
+  "uni0343": {
+    "_marktop": [
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+      1290
+    ],
+    "mkmktop": [
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+      1730
+    ]
+  },
+  "uni0348": {
+    "_markbottom": [
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+      0
+    ],
+    "mkmkbottom_acc": [
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+      -514
+    ]
+  },
+  "uni0354": {
+    "_markbottom": [
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+      0
+    ],
+    "mkmkbottom_acc": [
+      -576,
+      -555
+    ]
+  },
+  "uni0355": {
+    "_markbottom": [
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+      0
+    ],
+    "mkmkbottom_acc": [
+      -642,
+      -552
+    ]
+  },
+  "uni0356": {
+    "_markbottom": [
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+      0
+    ],
+    "mkmkbottom_acc": [
+      -609,
+      -556
+    ]
+  },
+  "uni0357": {
+    "_marktop": [
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+      1135
+    ],
+    "mkmktop": [
+      -625,
+      1567
+    ]
+  },
+  "uni035C": {
+    "_markbottom_dd": [
+      0,
+      -30
+    ]
+  },
+  "uni035F": {
+    "_markbottom_dd": [
+      0,
+      -10
+    ]
+  },
+  "uni03F3.ccmp": {
+    "bottom": [
+      276,
+      -459
+    ],
+    "top": [
+      275,
+      1269
+    ],
+    "top0315": [
+      596,
+      1269
+    ]
+  },
+  "uni042B": {
+    "top": [
+      905,
+      1600
+    ],
+    "top0315": [
+      1785,
+      1600
+    ]
+  },
+  "uni042B.smcp": {
+    "top": [
+      805,
+      1320
+    ],
+    "top0315": [
+      1614,
+      1320
+    ]
+  },
+  "uni042E": {
+    "top": [
+      916,
+      1600
+    ],
+    "top0315": [
+      1972,
+      1600
+    ]
+  },
+  "uni044B": {
+    "top": [
+      879,
+      1290
+    ],
+    "top0315": [
+      1730,
+      1290
+    ]
+  },
+  "uni0456.ccmp": {
+    "bottom": [
+      278,
+      10
+    ],
+    "top": [
+      289,
+      1269
+    ],
+    "top0315": [
+      577,
+      1269
+    ]
+  },
+  "uni0458.ccmp": {
+    "bottom": [
+      275,
+      -459
+    ],
+    "top": [
+      275,
+      1269
+    ],
+    "top0315": [
+      596,
+      1269
+    ]
+  },
+  "uni04BA": {
+    "left": [
+      989,
+      0
+    ],
+    "right": [
+      1313,
+      0
+    ],
+    "top": [
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+    ],
+    "top0315": [
+      1444,
+      1612
+    ]
+  },
+  "uni1AB4": {
+    "_marktop": [
+      -576,
+      1170
+    ]
+  },
+  "uni1AB5": {
+    "_markbottom": [
+      -577,
+      0
+    ]
+  },
+  "uni1AB8": {
+    "_markbottom": [
+      -492,
+      0
+    ]
+  },
+  "uni1D06": {
+    "bottom": [
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+      0
+    ],
+    "top": [
+      713,
+      1290
+    ],
+    "top0315": [
+      1287,
+      1290
+    ]
+  },
+  "uni1D08": {
+    "bottom": [
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+      0
+    ],
+    "top": [
+      533,
+      1290
+    ],
+    "top0315": [
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+      1290
+    ]
+  },
+  "uni1D0E": {
+    "bottom": [
+      582,
+      0
+    ],
+    "top": [
+      582,
+      1290
+    ],
+    "top0315": [
+      1151,
+      1290
+    ]
+  },
+  "uni1D1B": {
+    "bottom": [
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+      0
+    ],
+    "top": [
+      536,
+      1290
+    ],
+    "top0315": [
+      1064,
+      1290
+    ]
+  },
+  "uni1D20": {
+    "bottom": [
+      525,
+      0
+    ],
+    "top": [
+      525,
+      1290
+    ],
+    "top0315": [
+      1052,
+      1290
+    ]
+  },
+  "uni1D21": {
+    "bottom": [
+      749,
+      0
+    ],
+    "top": [
+      749,
+      1290
+    ],
+    "top0315": [
+      1493,
+      1290
+    ]
+  },
+  "uni1D22": {
+    "bottom": [
+      504,
+      0
+    ],
+    "top": [
+      504,
+      1290
+    ],
+    "top0315": [
+      1051,
+      1290
+    ]
+  },
+  "uni1D26": {
+    "bottom": [
+      514,
+      0
+    ],
+    "top": [
+      514,
+      1290
+    ],
+    "top0315": [
+      884,
+      1290
+    ]
+  },
+  "uni1D28": {
+    "bottom": [
+      603,
+      0
+    ],
+    "top": [
+      603,
+      1290
+    ],
+    "top0315": [
+      1207,
+      1290
+    ]
+  },
+  "uni1D29": {
+    "bottom": [
+      617,
+      0
+    ],
+    "top": [
+      617,
+      1290
+    ],
+    "top0315": [
+      1178,
+      1290
+    ]
+  },
+  "uni1D2B": {
+    "bottom": [
+      614,
+      0
+    ],
+    "top": [
+      614,
+      1290
+    ],
+    "top0315": [
+      1181,
+      1290
+    ]
+  },
+  "uni1D7B": {
+    "bottom": [
+      380,
+      0
+    ],
+    "top": [
+      380,
+      1290
+    ],
+    "top0315": [
+      761,
+      1290
+    ]
+  },
+  "uni1D7C": {
+    "bottom": [
+      389,
+      0
+    ],
+    "top": [
+      389,
+      1290
+    ],
+    "top0315": [
+      799,
+      1290
+    ]
+  },
+  "uni1DCE": {
+    "_marktop": [
+      -578,
+      967
+    ]
+  },
+  "uni1DE0": {
+    "_marktop": [
+      -576,
+      1170
+    ]
+  },
+  "uni1DEE": {
+    "_marktop": [
+      -576,
+      950
+    ]
+  },
+  "uni1DF5": {
+    "_marktop": [
+      -578,
+      1170
+    ]
+  },
+  "uni1DFE": {
+    "_marktop": [
+      -576,
+      1170
+    ]
+  },
+  "uni1FC0": {
+    "_top": [
+      474,
+      1182
+    ]
+  }
+}
\ No newline at end of file
diff --git a/res/anchors_regular.json b/res/anchors_regular.json
new file mode 100644
index 0000000..f98241f
--- /dev/null
+++ b/res/anchors_regular.json
@@ -0,0 +1,1092 @@
+{
+  "Esh": {
+    "bottom": [
+      584,
+      10
+    ],
+    "top": [
+      584,
+      1612
+    ],
+    "top0315": [
+      1175,
+      1612
+    ]
+  },
+  "Gbar": {
+    "bottom": [
+      668,
+      -10
+    ],
+    "top": [
+      668,
+      1633
+    ],
+    "top0315": [
+      1394,
+      1633
+    ]
+  },
+  "Ibar": {
+    "bottom": [
+      341,
+      10
+    ],
+    "top": [
+      341,
+      1612
+    ],
+    "top0315": [
+      682,
+      1612
+    ]
+  },
+  "a_uni02DE": {
+    "bottom": [
+      501,
+      0
+    ],
+    "bottom_dd": [
+      1118,
+      -407
+    ],
+    "markbottom": [
+      501,
+      0
+    ],
+    "ogonek": [
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+      0
+    ],
+    "rhalfring": [
+      700,
+      1290
+    ],
+    "top": [
+      582,
+      1290
+    ],
+    "top0315": [
+      1488,
+      1290
+    ],
+    "top_dd": [
+      1118,
+      1600
+    ]
+  },
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+  },
+  "uni1D26": {
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+  "uni1D28": {
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+  "uni1D29": {
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+  "uni1D2B": {
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+  "uni1D7B": {
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+  "uni1D7C": {
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+  "uni1DCE": {
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+  "uni1DE0": {
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+  "uni1DEE": {
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+  "uni1DF5": {
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+  "uni1DFE": {
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+    ]
+  },
+  "uni1FC0": {
+    "_top": [
+      354,
+      1182
+    ]
+  }
+}
\ No newline at end of file
diff --git a/res/anchors_thin.json b/res/anchors_thin.json
new file mode 100644
index 0000000..ca4b92f
--- /dev/null
+++ b/res/anchors_thin.json
@@ -0,0 +1,1092 @@
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+  "a_uni02DE": {
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+    "_top": [
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+  "tildesubnosp": {
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+  "underscorenosp": {
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+    "mkmkbottom_acc": [
+      -562,
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+      406,
+      1269
+    ]
+  },
+  "uni006A.ccmp": {
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+      406,
+      1269
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+      1549
+    ]
+  },
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+    "top": [
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+      1582
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+      1600
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+      1600
+    ]
+  },
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+      -459
+    ],
+    "top": [
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+      680,
+      1249
+    ]
+  },
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+      19
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+      1290
+    ]
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+      10
+    ],
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+      1269
+    ]
+  },
+  "uni0313": {
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+      1684
+    ],
+    "parent_top": [
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+      1353
+    ]
+  },
+  "uni0315": {
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+      1151
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+      1290
+    ],
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+    "mkmktop": [
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+  },
+  "uni0348": {
+    "_markbottom": [
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+      -489
+    ]
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+      -548
+    ]
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+    ],
+    "mkmkbottom_acc": [
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+      -549
+    ]
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+    ],
+    "mkmkbottom_acc": [
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+      1193
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+    "mkmktop": [
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+    ]
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+  "uni035C": {
+    "_markbottom_dd": [
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+      -40
+    ]
+  },
+  "uni035F": {
+    "_markbottom_dd": [
+      0,
+      -50
+    ]
+  },
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+      -459
+    ],
+    "top": [
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+      1249
+    ],
+    "top0315": [
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+      1249
+    ]
+  },
+  "uni042B": {
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+  },
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+      1320
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+  },
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+      1600
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+    "top0315": [
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+  },
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+    "top": [
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+      1269
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+    "top0315": [
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+      1269
+    ]
+  },
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+    "top": [
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+    "top0315": [
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+    ]
+  },
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+    ]
+  },
+  "uni1AB4": {
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+      1170
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+  },
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+  },
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+  },
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+  },
+  "uni1D1B": {
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+  },
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+    "top": [
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+    "top0315": [
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+    ]
+  },
+  "uni1D21": {
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+    ],
+    "top0315": [
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+      1290
+    ]
+  },
+  "uni1D22": {
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+    "top": [
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+    ],
+    "top0315": [
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+    ]
+  },
+  "uni1D26": {
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+    ],
+    "top0315": [
+      867,
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+    ]
+  },
+  "uni1D28": {
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+      0
+    ],
+    "top": [
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+    ],
+    "top0315": [
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+      1290
+    ]
+  },
+  "uni1D29": {
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+      0
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+      568,
+      1290
+    ],
+    "top0315": [
+      1056,
+      1290
+    ]
+  },
+  "uni1D2B": {
+    "bottom": [
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+      0
+    ],
+    "top": [
+      617,
+      1290
+    ],
+    "top0315": [
+      1122,
+      1290
+    ]
+  },
+  "uni1D7B": {
+    "bottom": [
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+      0
+    ],
+    "top": [
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+      1290
+    ],
+    "top0315": [
+      667,
+      1290
+    ]
+  },
+  "uni1D7C": {
+    "bottom": [
+      336,
+      0
+    ],
+    "top": [
+      336,
+      1290
+    ],
+    "top0315": [
+      702,
+      1290
+    ]
+  },
+  "uni1DCE": {
+    "_marktop": [
+      -513,
+      1052
+    ]
+  },
+  "uni1DE0": {
+    "_marktop": [
+      -562,
+      1170
+    ]
+  },
+  "uni1DEE": {
+    "_marktop": [
+      -562,
+      944
+    ]
+  },
+  "uni1DF5": {
+    "_marktop": [
+      -563,
+      1170
+    ]
+  },
+  "uni1DFE": {
+    "_marktop": [
+      -562,
+      1170
+    ]
+  },
+  "uni1FC0": {
+    "_top": [
+      353,
+      1263
+    ]
+  }
+}
\ No newline at end of file
diff --git a/scripts/build-v2.py b/scripts/build-v2.py
index a861a76..58842d6 100644
--- a/scripts/build-v2.py
+++ b/scripts/build-v2.py
@@ -31,9 +31,12 @@ BASEDIR = os.path.abspath(
 
 # Masters
 
-rg = Master("%s/src/v2/Roboto_Regular.ufo" % BASEDIR)
-bd = Master("%s/src/v2/Roboto_Bold.ufo" % BASEDIR)
-th = Master("%s/src/v2/Roboto_Thin.ufo" % BASEDIR)
+rg = Master("%s/src/v2/Roboto_Regular.ufo" % BASEDIR,
+            anchorPath="%s/res/anchors_regular.json" % BASEDIR)
+bd = Master("%s/src/v2/Roboto_Bold.ufo" % BASEDIR,
+            anchorPath="%s/res/anchors_bold.json" % BASEDIR)
+th = Master("%s/src/v2/Roboto_Thin.ufo" % BASEDIR,
+            anchorPath="%s/res/anchors_thin.json" % BASEDIR)
 
 # build condensed masters
 
diff --git a/scripts/lib/fontbuild/kerning.py b/scripts/lib/fontbuild/kerning.py
index 816ca1d..302c330 100644
--- a/scripts/lib/fontbuild/kerning.py
+++ b/scripts/lib/fontbuild/kerning.py
@@ -29,6 +29,7 @@ class KernFeatureWriter(AbstractFeatureWriter):
         self.kerning = font.kerning
         self.leftClasses = []
         self.rightClasses = []
+        self.classSizes = {}
 
     def write(self, linesep="\n"):
         """Write kern feature."""
@@ -42,30 +43,30 @@ class KernFeatureWriter(AbstractFeatureWriter):
             for rightName, rightContents in self.rightClasses:
                 rightKey = rightContents[0]
                 pair = leftKey, rightKey
-                if not self.kerning.has_key(pair):
+                kerningVal = self.kerning[pair]
+                if kerningVal is None:
                     continue
-                classPairKerning[leftName, rightName] = self.kerning[pair]
+                classPairKerning[leftName, rightName] = kerningVal
                 self.kerning.remove(pair)
 
             # collect rules with left class and right glyph
-            for pair, val in self.kerning.getLeft(leftKey):
-                leftClassKerning[leftName, pair[1]] = self.kerning[pair]
+            for pair, kerningVal in self.kerning.getLeft(leftKey):
+                leftClassKerning[leftName, pair[1]] = kerningVal
                 self.kerning.remove(pair)
 
         # collect rules with left glyph and right class
         for rightName, rightContents in self.rightClasses:
             rightKey = rightContents[0]
-            for pair, val in self.kerning.getRight(rightKey):
-                rightClassKerning[pair[0], rightName] = self.kerning[pair]
+            for pair, kerningVal in self.kerning.getRight(rightKey):
+                rightClassKerning[pair[0], rightName] = kerningVal
                 self.kerning.remove(pair)
 
         # write the feature
+        self.ruleCount = 0
         lines = ["feature kern {"]
         lines.append(self._writeKerning(self.kerning, linesep))
         lines.append(self._writeKerning(leftClassKerning, linesep, True))
-        lines.append("    subtable;")
         lines.append(self._writeKerning(rightClassKerning, linesep, True))
-        lines.append("    subtable;")
         lines.append(self._writeKerning(classPairKerning, linesep))
         lines.append("} kern;")
         return linesep.join(lines)
@@ -78,6 +79,15 @@ class KernFeatureWriter(AbstractFeatureWriter):
         pairs = kerning.items()
         pairs.sort()
         for (left, right), val in pairs:
+            if enum:
+                rulesAdded = (self.classSizes.get(left, 1) *
+                              self.classSizes.get(right, 1))
+            else:
+                rulesAdded = 1
+            self.ruleCount += rulesAdded
+            if self.ruleCount > 2048:
+                lines.append("    subtable;")
+                self.ruleCount = rulesAdded
             lines.append("    %spos %s %s %d;" % (enum, left, right, val))
         return linesep.join(lines)
 
@@ -91,6 +101,7 @@ class KernFeatureWriter(AbstractFeatureWriter):
             self.leftClasses.append(info)
         elif name.endswith("_R"):
             self.rightClasses.append(info)
+        self.classSizes[name] = len(contents)
 
 
 def makeKernFeature(font, text):
diff --git a/scripts/lib/fontbuild/markFeature.py b/scripts/lib/fontbuild/markFeature.py
index 30da7c3..b617ef6 100755
--- a/scripts/lib/fontbuild/markFeature.py
+++ b/scripts/lib/fontbuild/markFeature.py
@@ -108,12 +108,6 @@ def GenerateFeature_mark(font):
 	classname = "@MC_" + anchor_name

 

 	accent_name_list = CreateAccNameList(font, acc_anchor_name, comb_accent_only)

-	if not accent_name_list:

-		print (

-			'No glyph found with anchor "%s", skipping mark lookup for %s.' %

-			(acc_anchor_name, classname))

-		continue

-

 	accent_mark_list = CreateAccGlyphList(font, accent_name_list, acc_anchor_name)

 	base_mark_list = CreateGlyphList(font, accent_name_list, anchor_name)

 	text += Create_mark_lookup(accent_mark_list, base_mark_list, lookupname, classname, expand_to_composits)

diff --git a/scripts/lib/fontbuild/mix.py b/scripts/lib/fontbuild/mix.py
index 70d2e3a..bd396ed 100644
--- a/scripts/lib/fontbuild/mix.py
+++ b/scripts/lib/fontbuild/mix.py
@@ -15,6 +15,7 @@
 
 from numpy import array, append
 import copy
+import json
 from robofab.objects.objectsRF import RPoint
 from robofab.world import OpenFont
 from decomposeGlyph import decomposeGlyph
@@ -214,12 +215,13 @@ class FGlyph:
 
 class Master:
 
-    def __init__(self, font=None, v=0, kernlist=None, overlay=None):
+    def __init__(self, font=None, v=0, kernlist=None, overlay=None,
+                 anchorPath=None):
         if isinstance(font, FFont):
             self.font = None
             self.ffont = font
         elif isinstance(font,str):
-            self.openFont(font,overlay)
+            self.openFont(font,overlay, anchorPath)
         elif isinstance(font,Mix):
             self.font = font
         else:
@@ -238,7 +240,7 @@ class Master:
                             and not k[0] == ""]
             #TODO implement class based kerning / external kerning file
     
-    def openFont(self, path, overlayPath=None):
+    def openFont(self, path, overlayPath=None, anchorPath=None):
         self.font = OpenFont(path)
         for g in self.font:
           size = len(g)
@@ -252,6 +254,29 @@ class Master:
             for overlayGlyph in overlayFont:
                 font.insertGlyph(overlayGlyph)
 
+        # work around a bug with vfb2ufo in which anchors are dropped from
+        # glyphs containing components and no contours. "anchorPath" should
+        # point to the output of src/v2/get_dropped_anchors.py
+        if anchorPath:
+            anchorData = json.load(open(anchorPath))
+            for glyphName, anchors in anchorData.items():
+
+                # another bug: some entire glyphs are dropped during conversion.
+                # example: gbar_uni1ABE
+                try:
+                    glyph = self.font[glyphName]
+                except KeyError:
+                    continue
+
+                # another bug: some glyphs are decomposed during conversion, in
+                # which case they unexpectedly don't drop anchors.
+                # examples: uni04BA, Gbar (partially decomposed)
+                if glyph.anchors:
+                    continue
+
+                for name, (x, y) in anchors.items():
+                    glyph.appendAnchor(str(name), (x, y))
+
         self.ffont = FFont(self.font)
 
 
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..3fd5676
--- /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=2,
+                      separators=(',', ': '))
+            print "Wrote " + outpath
+    print "Done"
+
+
+main()