[ot] Search globally for 'vert' feature if not found in specified script/lang
Fixes https://github.com/behdad/harfbuzz/issues/63
diff --git a/src/hb-ot-layout.cc b/src/hb-ot-layout.cc
index 5570a81..6fe7b6c 100644
--- a/src/hb-ot-layout.cc
+++ b/src/hb-ot-layout.cc
@@ -291,6 +291,28 @@
return g.get_feature_tags (start_offset, feature_count, feature_tags);
}
+hb_bool_t
+hb_ot_layout_table_find_feature (hb_face_t *face,
+ hb_tag_t table_tag,
+ hb_tag_t feature_tag,
+ unsigned int *feature_index)
+{
+ ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX);
+ const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
+
+ unsigned int num_features = g.get_feature_count ();
+ for (unsigned int i = 0; i < num_features; i++)
+ {
+ if (feature_tag == g.get_feature_tag (i)) {
+ if (feature_index) *feature_index = i;
+ return true;
+ }
+ }
+
+ if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
+ return false;
+}
+
unsigned int
hb_ot_layout_script_get_language_tags (hb_face_t *face,
