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diff --git a/src/hb-aat-map.cc b/src/hb-aat-map.cc
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+++ b/src/hb-aat-map.cc
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+/*
+ * Copyright © 2009,2010  Red Hat, Inc.
+ * Copyright © 2010,2011,2013  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-aat-map.hh"
+
+#include "hb-aat-layout.hh"
+
+
+void hb_aat_map_builder_t::add_feature (hb_tag_t tag,
+					unsigned int value)
+{
+  if (tag == HB_TAG ('a','a','l','t'))
+  {
+    feature_info_t *info = features.push();
+    info->type = HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_ALTERNATIVES;
+    info->setting = (hb_aat_layout_feature_selector_t) value;
+    return;
+  }
+
+  const hb_aat_feature_mapping_t *mapping = hb_aat_layout_find_feature_mapping (tag);
+  if (!mapping) return;
+
+  feature_info_t *info = features.push();
+  info->type = mapping->aatFeatureType;
+  info->setting = value ? mapping->selectorToEnable : mapping->selectorToDisable;
+}
+
+void
+hb_aat_map_builder_t::compile (hb_aat_map_t  &m)
+{
+  /* Sort features and merge duplicates */
+  if (features.length)
+  {
+    features.qsort ();
+    unsigned int j = 0;
+    for (unsigned int i = 1; i < features.length; i++)
+      if (features[i].type != features[j].type)
+	features[++j] = features[i];
+    features.shrink (j + 1);
+  }
+
+  hb_aat_layout_compile_map (this, &m);
+}