hb-ot-layout-gdef-table.hh

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/*
 * Copyright © 2007,2008,2009  Red Hat, Inc.
 * Copyright © 2010,2011,2012  Google, Inc.
 *
 *  This is part of HarfBuzz, a text shaping library.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and its documentation for any purpose, provided that the
 * above copyright notice and the following two paragraphs appear in
 * all copies of this software.
 *
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 * Red Hat Author(s): Behdad Esfahbod
 * Google Author(s): Behdad Esfahbod
 */
 
#ifndef HB_OT_LAYOUT_GDEF_TABLE_HH
#define HB_OT_LAYOUT_GDEF_TABLE_HH
 
#include "hb-ot-layout-common.hh"
 
#include "hb-font.hh"
 
 
namespace OT {
 
 
/*
 * Attachment List Table
 */
 
/* Array of contour point indices--in increasing numerical order */
struct AttachPoint : Array16Of<HBUINT16>
{
  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    auto *out = c->serializer->start_embed (*this);
    if (unlikely (!out)) return_trace (false);
 
    return_trace (out->serialize (c->serializer, + iter ()));
  }
};
 
struct AttachList
{
  unsigned int get_attach_points (hb_codepoint_t glyph_id,
                  unsigned int start_offset,
                  unsigned int *point_count /* IN/OUT */,
                  unsigned int *point_array /* OUT */) const
  {
    unsigned int index = (this+coverage).get_coverage (glyph_id);
    if (index == NOT_COVERED)
    {
      if (point_count)
    *point_count = 0;
      return 0;
    }
 
    const AttachPoint &points = this+attachPoint[index];
 
    if (point_count)
    {
      + points.sub_array (start_offset, point_count)
      | hb_sink (hb_array (point_array, *point_count))
      ;
    }
 
    return points.len;
  }
 
  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
    const hb_map_t &glyph_map = *c->plan->glyph_map;
 
    auto *out = c->serializer->start_embed (*this);
    if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
 
    hb_sorted_vector_t<hb_codepoint_t> new_coverage;
    + hb_zip (this+coverage, attachPoint)
    | hb_filter (glyphset, hb_first)
    | hb_filter (subset_offset_array (c, out->attachPoint, this), hb_second)
    | hb_map (hb_first)
    | hb_map (glyph_map)
    | hb_sink (new_coverage)
    ;
    out->coverage.serialize_serialize (c->serializer, new_coverage.iter ());
    return_trace (bool (new_coverage));
  }
 
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (coverage.sanitize (c, this) && attachPoint.sanitize (c, this));
  }
 
  protected:
  Offset16To<Coverage>
        coverage;       /* Offset to Coverage table -- from
                     * beginning of AttachList table */
  Array16OfOffset16To<AttachPoint>
        attachPoint;        /* Array of AttachPoint tables
                     * in Coverage Index order */
  public:
  DEFINE_SIZE_ARRAY (4, attachPoint);
};
 
/*
 * Ligature Caret Table
 */
 
struct CaretValueFormat1
{
  friend struct CaretValue;
  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    auto *out = c->serializer->embed (this);
    if (unlikely (!out)) return_trace (false);
    return_trace (true);
  }
 
  private:
  hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction) const
  {
    return HB_DIRECTION_IS_HORIZONTAL (direction) ? font->em_scale_x (coordinate) : font->em_scale_y (coordinate);
  }
 
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (c->check_struct (this));
  }
 
  protected:
  HBUINT16  caretValueFormat;   /* Format identifier--format = 1 */
  FWORD     coordinate;     /* X or Y value, in design units */
  public:
  DEFINE_SIZE_STATIC (4);
};
 
struct CaretValueFormat2
{
  friend struct CaretValue;
  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    auto *out = c->serializer->embed (this);
    if (unlikely (!out)) return_trace (false);
    return_trace (true);
  }
 
  private:
  hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id) const
  {
    hb_position_t x, y;
    font->get_glyph_contour_point_for_origin (glyph_id, caretValuePoint, direction, &x, &y);
    return HB_DIRECTION_IS_HORIZONTAL (direction) ? x : y;
  }
 
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (c->check_struct (this));
  }
 
  protected:
  HBUINT16  caretValueFormat;   /* Format identifier--format = 2 */
  HBUINT16  caretValuePoint;    /* Contour point index on glyph */
  public:
  DEFINE_SIZE_STATIC (4);
};
 
struct CaretValueFormat3
{
  friend struct CaretValue;
 
  hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction,
                 const VariationStore &var_store) const
  {
    return HB_DIRECTION_IS_HORIZONTAL (direction) ?
       font->em_scale_x (coordinate) + (this+deviceTable).get_x_delta (font, var_store) :
       font->em_scale_y (coordinate) + (this+deviceTable).get_y_delta (font, var_store);
  }
 
  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    auto *out = c->serializer->embed (this);
    if (unlikely (!out)) return_trace (false);
 
    return_trace (out->deviceTable.serialize_copy (c->serializer, deviceTable, this, c->serializer->to_bias (out),
                           hb_serialize_context_t::Head, c->plan->layout_variation_idx_map));
  }
 
  void collect_variation_indices (hb_set_t *layout_variation_indices) const
  { (this+deviceTable).collect_variation_indices (layout_variation_indices); }
 
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (c->check_struct (this) && deviceTable.sanitize (c, this));
  }
 
  protected:
  HBUINT16  caretValueFormat;   /* Format identifier--format = 3 */
  FWORD     coordinate;     /* X or Y value, in design units */
  Offset16To<Device>
        deviceTable;        /* Offset to Device table for X or Y
                     * value--from beginning of CaretValue
                     * table */
  public:
  DEFINE_SIZE_STATIC (6);
};
 
struct CaretValue
{
  hb_position_t get_caret_value (hb_font_t *font,
                 hb_direction_t direction,
                 hb_codepoint_t glyph_id,
                 const VariationStore &var_store) const
  {
    switch (u.format) {
    case 1: return u.format1.get_caret_value (font, direction);
    case 2: return u.format2.get_caret_value (font, direction, glyph_id);
    case 3: return u.format3.get_caret_value (font, direction, var_store);
    default:return 0;
    }
  }
 
  template <typename context_t, typename ...Ts>
  typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
  {
    TRACE_DISPATCH (this, u.format);
    if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
    switch (u.format) {
    case 1: return_trace (c->dispatch (u.format1, std::forward<Ts> (ds)...));
    case 2: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...));
    case 3: return_trace (c->dispatch (u.format3, std::forward<Ts> (ds)...));
    default:return_trace (c->default_return_value ());
    }
  }
 
  void collect_variation_indices (hb_set_t *layout_variation_indices) const
  {
    switch (u.format) {
    case 1:
    case 2:
      return;
    case 3:
      u.format3.collect_variation_indices (layout_variation_indices);
      return;
    default: return;
    }
  }
 
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    if (!u.format.sanitize (c)) return_trace (false);
    switch (u.format) {
    case 1: return_trace (u.format1.sanitize (c));
    case 2: return_trace (u.format2.sanitize (c));
    case 3: return_trace (u.format3.sanitize (c));
    default:return_trace (true);
    }
  }
 
  protected:
  union {
  HBUINT16      format;     /* Format identifier */
  CaretValueFormat1 format1;
  CaretValueFormat2 format2;
  CaretValueFormat3 format3;
  } u;
  public:
  DEFINE_SIZE_UNION (2, format);
};
 
struct LigGlyph
{
  unsigned get_lig_carets (hb_font_t            *font,
               hb_direction_t        direction,
               hb_codepoint_t        glyph_id,
               const VariationStore &var_store,
               unsigned              start_offset,
               unsigned             *caret_count /* IN/OUT */,
               hb_position_t        *caret_array /* OUT */) const
  {
    if (caret_count)
    {
      + carets.sub_array (start_offset, caret_count)
      | hb_map (hb_add (this))
      | hb_map ([&] (const CaretValue &value) { return value.get_caret_value (font, direction, glyph_id, var_store); })
      | hb_sink (hb_array (caret_array, *caret_count))
      ;
    }
 
    return carets.len;
  }
 
  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    auto *out = c->serializer->start_embed (*this);
    if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
 
    + hb_iter (carets)
    | hb_apply (subset_offset_array (c, out->carets, this))
    ;
 
    return_trace (bool (out->carets));
  }
 
  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const
  {
    for (const Offset16To<CaretValue>& offset : carets.iter ())
      (this+offset).collect_variation_indices (c->layout_variation_indices);
  }
 
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (carets.sanitize (c, this));
  }
 
  protected:
  Array16OfOffset16To<CaretValue>
        carets;         /* Offset array of CaretValue tables
                     * --from beginning of LigGlyph table
                     * --in increasing coordinate order */
  public:
  DEFINE_SIZE_ARRAY (2, carets);
};
 
struct LigCaretList
{
  unsigned int get_lig_carets (hb_font_t *font,
                   hb_direction_t direction,
                   hb_codepoint_t glyph_id,
                   const VariationStore &var_store,
                   unsigned int start_offset,
                   unsigned int *caret_count /* IN/OUT */,
                   hb_position_t *caret_array /* OUT */) const
  {
    unsigned int index = (this+coverage).get_coverage (glyph_id);
    if (index == NOT_COVERED)
    {
      if (caret_count)
    *caret_count = 0;
      return 0;
    }
    const LigGlyph &lig_glyph = this+ligGlyph[index];
    return lig_glyph.get_lig_carets (font, direction, glyph_id, var_store, start_offset, caret_count, caret_array);
  }
 
  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
    const hb_map_t &glyph_map = *c->plan->glyph_map;
 
    auto *out = c->serializer->start_embed (*this);
    if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
 
    hb_sorted_vector_t<hb_codepoint_t> new_coverage;
    + hb_zip (this+coverage, ligGlyph)
    | hb_filter (glyphset, hb_first)
    | hb_filter (subset_offset_array (c, out->ligGlyph, this), hb_second)
    | hb_map (hb_first)
    | hb_map (glyph_map)
    | hb_sink (new_coverage)
    ;
    out->coverage.serialize_serialize (c->serializer, new_coverage.iter ());
    return_trace (bool (new_coverage));
  }
 
  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const
  {
    + hb_zip (this+coverage, ligGlyph)
    | hb_filter (c->glyph_set, hb_first)
    | hb_map (hb_second)
    | hb_map (hb_add (this))
    | hb_apply ([c] (const LigGlyph& _) { _.collect_variation_indices (c); })
    ;
  }
 
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (coverage.sanitize (c, this) && ligGlyph.sanitize (c, this));
  }
 
  protected:
  Offset16To<Coverage>
        coverage;       /* Offset to Coverage table--from
                     * beginning of LigCaretList table */
  Array16OfOffset16To<LigGlyph>
        ligGlyph;       /* Array of LigGlyph tables
                     * in Coverage Index order */
  public:
  DEFINE_SIZE_ARRAY (4, ligGlyph);
};
 
 
struct MarkGlyphSetsFormat1
{
  bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const
  { return (this+coverage[set_index]).get_coverage (glyph_id) != NOT_COVERED; }
 
  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    auto *out = c->serializer->start_embed (*this);
    if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
    out->format = format;
 
    bool ret = true;
    for (const Offset32To<Coverage>& offset : coverage.iter ())
    {
      auto *o = out->coverage.serialize_append (c->serializer);
      if (unlikely (!o))
      {
    ret = false;
    break;
      }
 
      //not using o->serialize_subset (c, offset, this, out) here because
      //OTS doesn't allow null offset.
      //See issue: https://github.com/khaledhosny/ots/issues/172
      c->serializer->push ();
      c->dispatch (this+offset);
      c->serializer->add_link (*o, c->serializer->pop_pack ());
    }
 
    return_trace (ret && out->coverage.len);
  }
 
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (coverage.sanitize (c, this));
  }
 
  protected:
  HBUINT16  format;         /* Format identifier--format = 1 */
  Array16Of<Offset32To<Coverage>>
        coverage;       /* Array of long offsets to mark set
                     * coverage tables */
  public:
  DEFINE_SIZE_ARRAY (4, coverage);
};
 
struct MarkGlyphSets
{
  bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const
  {
    switch (u.format) {
    case 1: return u.format1.covers (set_index, glyph_id);
    default:return false;
    }
  }
 
  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    switch (u.format) {
    case 1: return_trace (u.format1.subset (c));
    default:return_trace (false);
    }
  }
 
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    if (!u.format.sanitize (c)) return_trace (false);
    switch (u.format) {
    case 1: return_trace (u.format1.sanitize (c));
    default:return_trace (true);
    }
  }
 
  protected:
  union {
  HBUINT16      format;     /* Format identifier */
  MarkGlyphSetsFormat1  format1;
  } u;
  public:
  DEFINE_SIZE_UNION (2, format);
};
 
 
/*
 * GDEF -- Glyph Definition
 * https://docs.microsoft.com/en-us/typography/opentype/spec/gdef
 */
 
 
struct GDEF
{
  static constexpr hb_tag_t tableTag = HB_OT_TAG_GDEF;
 
  enum GlyphClasses {
    UnclassifiedGlyph   = 0,
    BaseGlyph       = 1,
    LigatureGlyph   = 2,
    MarkGlyph       = 3,
    ComponentGlyph  = 4
  };
 
  bool has_data () const { return version.to_int (); }
  bool has_glyph_classes () const { return glyphClassDef != 0; }
  unsigned int get_glyph_class (hb_codepoint_t glyph) const
  { return (this+glyphClassDef).get_class (glyph); }
  void get_glyphs_in_class (unsigned int klass, hb_set_t *glyphs) const
  { (this+glyphClassDef).collect_class (glyphs, klass); }
 
  bool has_mark_attachment_types () const { return markAttachClassDef != 0; }
  unsigned int get_mark_attachment_type (hb_codepoint_t glyph) const
  { return (this+markAttachClassDef).get_class (glyph); }
 
  bool has_attach_points () const { return attachList != 0; }
  unsigned int get_attach_points (hb_codepoint_t glyph_id,
                  unsigned int start_offset,
                  unsigned int *point_count /* IN/OUT */,
                  unsigned int *point_array /* OUT */) const
  { return (this+attachList).get_attach_points (glyph_id, start_offset, point_count, point_array); }
 
  bool has_lig_carets () const { return ligCaretList != 0; }
  unsigned int get_lig_carets (hb_font_t *font,
                   hb_direction_t direction,
                   hb_codepoint_t glyph_id,
                   unsigned int start_offset,
                   unsigned int *caret_count /* IN/OUT */,
                   hb_position_t *caret_array /* OUT */) const
  { return (this+ligCaretList).get_lig_carets (font,
                           direction, glyph_id, get_var_store(),
                           start_offset, caret_count, caret_array); }
 
  bool has_mark_sets () const { return version.to_int () >= 0x00010002u && markGlyphSetsDef != 0; }
  bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const
  { return version.to_int () >= 0x00010002u && (this+markGlyphSetsDef).covers (set_index, glyph_id); }
 
  bool has_var_store () const { return version.to_int () >= 0x00010003u && varStore != 0; }
  const VariationStore &get_var_store () const
  { return version.to_int () >= 0x00010003u ? this+varStore : Null (VariationStore); }
 
  /* glyph_props is a 16-bit integer where the lower 8-bit have bits representing
   * glyph class and other bits, and high 8-bit the mark attachment type (if any).
   * Not to be confused with lookup_props which is very similar. */
  unsigned int get_glyph_props (hb_codepoint_t glyph) const
  {
    unsigned int klass = get_glyph_class (glyph);
 
    static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH == (unsigned int) LookupFlag::IgnoreBaseGlyphs), "");
    static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE == (unsigned int) LookupFlag::IgnoreLigatures), "");
    static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_MARK == (unsigned int) LookupFlag::IgnoreMarks), "");
 
    switch (klass) {
    default:            return 0;
    case BaseGlyph:     return HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH;
    case LigatureGlyph:     return HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE;
    case MarkGlyph:
      klass = get_mark_attachment_type (glyph);
      return HB_OT_LAYOUT_GLYPH_PROPS_MARK | (klass << 8);
    }
  }
 
  HB_INTERNAL bool is_blocklisted (hb_blob_t *blob,
                   hb_face_t *face) const;
 
  struct accelerator_t
  {
    accelerator_t (hb_face_t *face)
    {
      table = hb_sanitize_context_t ().reference_table<GDEF> (face);
      if (unlikely (table->is_blocklisted (table.get_blob (), face)))
      {
    hb_blob_destroy (table.get_blob ());
    table = hb_blob_get_empty ();
      }
    }
    ~accelerator_t () { table.destroy (); }
 
    hb_blob_ptr_t<GDEF> table;
  };
 
  unsigned int get_size () const
  {
    return min_size +
       (version.to_int () >= 0x00010002u ? markGlyphSetsDef.static_size : 0) +
       (version.to_int () >= 0x00010003u ? varStore.static_size : 0);
  }
 
  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const
  { (this+ligCaretList).collect_variation_indices (c); }
 
  void remap_layout_variation_indices (const hb_set_t *layout_variation_indices,
                       hb_map_t *layout_variation_idx_map /* OUT */) const
  {
    if (version.to_int () < 0x00010003u || !varStore) return;
    if (layout_variation_indices->is_empty ()) return;
 
    unsigned new_major = 0, new_minor = 0;
    unsigned last_major = (layout_variation_indices->get_min ()) >> 16;
    for (unsigned idx : layout_variation_indices->iter ())
    {
      uint16_t major = idx >> 16;
      if (major >= (this+varStore).get_sub_table_count ()) break;
      if (major != last_major)
      {
    new_minor = 0;
    ++new_major;
      }
 
      unsigned new_idx = (new_major << 16) + new_minor;
      layout_variation_idx_map->set (idx, new_idx);
      ++new_minor;
      last_major = major;
    }
  }
 
  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);
    auto *out = c->serializer->embed (*this);
    if (unlikely (!out)) return_trace (false);
 
    bool subset_glyphclassdef = out->glyphClassDef.serialize_subset (c, glyphClassDef, this, nullptr, false, true);
    bool subset_attachlist = out->attachList.serialize_subset (c, attachList, this);
    bool subset_ligcaretlist = out->ligCaretList.serialize_subset (c, ligCaretList, this);
    bool subset_markattachclassdef = out->markAttachClassDef.serialize_subset (c, markAttachClassDef, this, nullptr, false, true);
 
    bool subset_markglyphsetsdef = true;
    if (version.to_int () >= 0x00010002u)
    {
      subset_markglyphsetsdef = out->markGlyphSetsDef.serialize_subset (c, markGlyphSetsDef, this);
      if (!subset_markglyphsetsdef &&
      version.to_int () == 0x00010002u)
    out->version.minor = 0;
    }
 
    bool subset_varstore = true;
    if (version.to_int () >= 0x00010003u)
    {
      subset_varstore = out->varStore.serialize_subset (c, varStore, this);
      if (!subset_varstore && version.to_int () == 0x00010003u)
    out->version.minor = 2;
    }
 
    return_trace (subset_glyphclassdef || subset_attachlist ||
          subset_ligcaretlist || subset_markattachclassdef ||
          (out->version.to_int () >= 0x00010002u && subset_markglyphsetsdef) ||
          (out->version.to_int () >= 0x00010003u && subset_varstore));
  }
 
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (version.sanitize (c) &&
          likely (version.major == 1) &&
          glyphClassDef.sanitize (c, this) &&
          attachList.sanitize (c, this) &&
          ligCaretList.sanitize (c, this) &&
          markAttachClassDef.sanitize (c, this) &&
          (version.to_int () < 0x00010002u || markGlyphSetsDef.sanitize (c, this)) &&
          (version.to_int () < 0x00010003u || varStore.sanitize (c, this)));
  }
 
  protected:
  FixedVersion<>version;        /* Version of the GDEF table--currently
                     * 0x00010003u */
  Offset16To<ClassDef>
        glyphClassDef;      /* Offset to class definition table
                     * for glyph type--from beginning of
                     * GDEF header (may be Null) */
  Offset16To<AttachList>
        attachList;     /* Offset to list of glyphs with
                     * attachment points--from beginning
                     * of GDEF header (may be Null) */
  Offset16To<LigCaretList>
        ligCaretList;       /* Offset to list of positioning points
                     * for ligature carets--from beginning
                     * of GDEF header (may be Null) */
  Offset16To<ClassDef>
        markAttachClassDef; /* Offset to class definition table for
                     * mark attachment type--from beginning
                     * of GDEF header (may be Null) */
  Offset16To<MarkGlyphSets>
        markGlyphSetsDef;   /* Offset to the table of mark set
                     * definitions--from beginning of GDEF
                     * header (may be NULL).  Introduced
                     * in version 0x00010002. */
  Offset32To<VariationStore>
        varStore;       /* Offset to the table of Item Variation
                     * Store--from beginning of GDEF
                     * header (may be NULL).  Introduced
                     * in version 0x00010003. */
  public:
  DEFINE_SIZE_MIN (12);
};
 
struct GDEF_accelerator_t : GDEF::accelerator_t {
  GDEF_accelerator_t (hb_face_t *face) : GDEF::accelerator_t (face) {}
};
 
} /* namespace OT */
 
 
#endif /* HB_OT_LAYOUT_GDEF_TABLE_HH */