From 52a00cd87f63c8ab32413a1a9ce792a3e2ec84e2 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 31 Oct 2018 19:05:53 -0700
Subject: [PATCH] [aat] Implement 'aalt' mapping

Fixes https://github.com/harfbuzz/harfbuzz/issues/1160
---
 src/hb-aat-map.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/hb-aat-map.cc b/src/hb-aat-map.cc
index f2736bfd1..1ce1b12b0 100644
--- a/src/hb-aat-map.cc
+++ b/src/hb-aat-map.cc
@@ -34,6 +34,14 @@
 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 = 17/*kCharacterAlternativesType*/;
+    info->setting = value;
+    return;
+  }
+
   const hb_aat_feature_mapping_t *mapping = hb_aat_layout_find_feature_mapping (tag);
   if (!mapping) return;