1 files changed, 58 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/OT/Layout/GSUB/GSUB.hh b/thirdparty/harfbuzz/src/OT/Layout/GSUB/GSUB.hh
new file mode 100644
index 0000000000..ad153ce8d7
--- /dev/null
+++ b/thirdparty/harfbuzz/src/OT/Layout/GSUB/GSUB.hh
@@ -0,0 +1,58 @@
+#ifndef OT_LAYOUT_GSUB_GSUB_HH
+#define OT_LAYOUT_GSUB_GSUB_HH
+
+// TODO(garretrieger): move to new layout.
+#include "../../../hb-ot-layout-gsubgpos.hh"
+#include "Common.hh"
+#include "SubstLookup.hh"
+
+using OT::Layout::GSUB::SubstLookup;
+
+namespace OT {
+namespace Layout {
+namespace GSUB {
+
+/*
+ * GSUB -- Glyph Substitution
+ * https://docs.microsoft.com/en-us/typography/opentype/spec/gsub
+ */
+
+struct GSUB : GSUBGPOS
+{
+  static constexpr hb_tag_t tableTag = HB_OT_TAG_GSUB;
+
+  const SubstLookup& get_lookup (unsigned int i) const
+  { return static_cast<const SubstLookup &> (GSUBGPOS::get_lookup (i)); }
+
+  bool subset (hb_subset_context_t *c) const
+  {
+    hb_subset_layout_context_t l (c, tableTag, c->plan->gsub_lookups, c->plan->gsub_langsys, c->plan->gsub_features);
+    return GSUBGPOS::subset<SubstLookup> (&l);
+  }
+
+  bool sanitize (hb_sanitize_context_t *c) const
+  { return GSUBGPOS::sanitize<SubstLookup> (c); }
+
+  HB_INTERNAL bool is_blocklisted (hb_blob_t *blob,
+                                   hb_face_t *face) const;
+
+  void closure_lookups (hb_face_t      *face,
+                        const hb_set_t *glyphs,
+                        hb_set_t       *lookup_indexes /* IN/OUT */) const
+  { GSUBGPOS::closure_lookups<SubstLookup> (face, glyphs, lookup_indexes); }
+
+  typedef GSUBGPOS::accelerator_t<GSUB> accelerator_t;
+};
+
+
+}
+}
+
+struct GSUB_accelerator_t : Layout::GSUB::GSUB::accelerator_t {
+  GSUB_accelerator_t (hb_face_t *face) : Layout::GSUB::GSUB::accelerator_t (face) {}
+};
+
+
+}
+
+#endif  /* OT_LAYOUT_GSUB_GSUB_HH */