#ifndef OT_GLYF_SUBSETGLYPH_HH

#define OT_GLYF_SUBSETGLYPH_HH

#include "../../hb-open-type.hh"

namespace OT {

struct glyf_accelerator_t;

namespace glyf_impl {

struct SubsetGlyph

{

  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,

      hb_font_t *font)

  {

    TRACE_SERIALIZE (this);

    if (font)

    {

      const OT::glyf_accelerator_t &glyf = *font->face->table.glyf;

      if (!this->compile_bytes_with_deltas (plan, font, glyf))

        return_trace (false);

    }

    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 (_.get_gid(), &new_gid))

  const_cast<CompositeGlyphRecord &> (_).set_gid (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);

  }

  bool compile_bytes_with_deltas (const hb_subset_plan_t *plan,

                                  hb_font_t *font,

                                  const glyf_accelerator_t &glyf)

  { return source_glyph.compile_bytes_with_deltas (plan, font, glyf, dest_start, dest_end); }

  void free_compiled_bytes ()

  {

    dest_start.fini ();

    dest_end.fini ();

  }

  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 */