1 files changed, 72 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/OT/glyf/SubsetGlyph.hh b/thirdparty/harfbuzz/src/OT/glyf/SubsetGlyph.hh
new file mode 100644
index 0000000000..ebe4372047
--- /dev/null
+++ b/thirdparty/harfbuzz/src/OT/glyf/SubsetGlyph.hh
@@ -0,0 +1,72 @@
+#ifndef OT_GLYF_SUBSETGLYPH_HH
+#define OT_GLYF_SUBSETGLYPH_HH
+
+
+#include "../../hb-open-type.hh"
+
+
+namespace OT {
+namespace glyf_impl {
+
+
+struct SubsetGlyph
+{
+  hb_codepoint_t new_gid;
+  hb_codepoint_t old_gid;
+  Glyph source_glyph;
+  hb_bytes_t dest_start;  /* region of source_glyph to copy first */
+  hb_bytes_t dest_end;    /* region of source_glyph to copy second */
+
+  bool serialize (hb_serialize_context_t *c,
+		  bool use_short_loca,
+		  const hb_subset_plan_t *plan) const
+  {
+    TRACE_SERIALIZE (this);
+
+    hb_bytes_t dest_glyph = dest_start.copy (c);
+    dest_glyph = hb_bytes_t (&dest_glyph, dest_glyph.length + dest_end.copy (c).length);
+    unsigned int pad_length = use_short_loca ? padding () : 0;
+    DEBUG_MSG (SUBSET, nullptr, "serialize %d byte glyph, width %d pad %d", dest_glyph.length, dest_glyph.length + pad_length, pad_length);
+
+    HBUINT8 pad;
+    pad = 0;
+    while (pad_length > 0)
+    {
+      c->embed (pad);
+      pad_length--;
+    }
+
+    if (unlikely (!dest_glyph.length)) return_trace (true);
+
+    /* update components gids */
+    for (auto &_ : Glyph (dest_glyph).get_composite_iterator ())
+    {
+      hb_codepoint_t new_gid;
+      if (plan->new_gid_for_old_gid (_.glyphIndex, &new_gid))
+	const_cast<CompositeGlyphRecord &> (_).glyphIndex = new_gid;
+    }
+
+    if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
+      Glyph (dest_glyph).drop_hints ();
+
+    if (plan->flags & HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG)
+      Glyph (dest_glyph).set_overlaps_flag ();
+
+    return_trace (true);
+  }
+
+  void drop_hints_bytes ()
+  { source_glyph.drop_hints_bytes (dest_start, dest_end); }
+
+  unsigned int      length () const { return dest_start.length + dest_end.length; }
+  /* pad to 2 to ensure 2-byte loca will be ok */
+  unsigned int     padding () const { return length () % 2; }
+  unsigned int padded_size () const { return length () + padding (); }
+};
+
+
+} /* namespace glyf_impl */
+} /* namespace OT */
+
+
+#endif /* OT_GLYF_SUBSETGLYPH_HH */