#ifndef OT_VAR_VARC_VARC_HH

#define OT_VAR_VARC_VARC_HH

#include "../../../hb-decycler.hh"

#include "../../../hb-geometry.hh"

#include "../../../hb-ot-layout-common.hh"

#include "../../../hb-ot-glyf-table.hh"

#include "../../../hb-ot-cff2-table.hh"

#include "../../../hb-ot-cff1-table.hh"

#include "coord-setter.hh"

namespace OT {

//namespace Var {

/*

 * VARC -- Variable Composites

 * https://github.com/harfbuzz/boring-expansion-spec/blob/main/VARC.md

 */

#ifndef HB_NO_VAR_COMPOSITES

struct hb_varc_scratch_t

{

  hb_vector_t<unsigned> axisIndices;

  hb_vector_t<float> axisValues;

  hb_glyf_scratch_t glyf_scratch;

};

struct hb_varc_context_t

{

  hb_font_t *font;

  hb_draw_session_t *draw_session;

  hb_extents_t<> *extents;

  mutable hb_decycler_t decycler;

  mutable signed edges_left;

  mutable signed depth_left;

  hb_varc_scratch_t &scratch;

};

struct VarComponent

{

  enum class flags_t : uint32_t

  {

    RESET_UNSPECIFIED_AXES  = 1u << 0,

    HAVE_AXES     = 1u << 1,

    AXIS_VALUES_HAVE_VARIATION  = 1u << 2,

    TRANSFORM_HAS_VARIATION = 1u << 3,

    HAVE_TRANSLATE_X    = 1u << 4,

    HAVE_TRANSLATE_Y    = 1u << 5,

    HAVE_ROTATION   = 1u << 6,

    HAVE_CONDITION    = 1u << 7,

    HAVE_SCALE_X    = 1u << 8,

    HAVE_SCALE_Y    = 1u << 9,

    HAVE_TCENTER_X    = 1u << 10,

    HAVE_TCENTER_Y    = 1u << 11,

    GID_IS_24BIT    = 1u << 12,

    HAVE_SKEW_X     = 1u << 13,

    HAVE_SKEW_Y     = 1u << 14,

    RESERVED_MASK   = ~((1u << 15) - 1),

  };

  HB_INTERNAL hb_ubytes_t

  get_path_at (const hb_varc_context_t &c,

         hb_codepoint_t parent_gid,

         hb_array_t<const int> coords,

         hb_transform_t<> transform,

         hb_ubytes_t record,

         hb_scalar_cache_t *cache = nullptr) const;

};

struct VarCompositeGlyph

{

  static void

  get_path_at (const hb_varc_context_t &c,

         hb_codepoint_t gid,

         hb_array_t<const int> coords,

         hb_transform_t<> transform,

         hb_ubytes_t record,

         hb_scalar_cache_t *cache)

  {

    while (record)

    {

      const VarComponent &comp = * (const VarComponent *) (record.arrayZ);

      record = comp.get_path_at (c,

         gid,

         coords, transform,

         record,

         cache);

    }

  }

};

HB_MARK_AS_FLAG_T (VarComponent::flags_t);

struct VARC

{

  friend struct VarComponent;

  static constexpr hb_tag_t tableTag = HB_TAG ('V', 'A', 'R', 'C');

  HB_INTERNAL bool

  get_path_at (const hb_varc_context_t &c,

         hb_codepoint_t gid,

         hb_array_t<const int> coords,

         hb_transform_t<> transform = HB_TRANSFORM_IDENTITY,

         hb_codepoint_t parent_gid = HB_CODEPOINT_INVALID,

         hb_scalar_cache_t *parent_cache = nullptr) const;

  bool

  get_path (hb_font_t *font,

      hb_codepoint_t gid,

      hb_draw_session_t &draw_session,

      hb_varc_scratch_t &scratch) const

  {

    hb_varc_context_t c {font,

       &draw_session,

       nullptr,

       hb_decycler_t {},

       HB_MAX_GRAPH_EDGE_COUNT,

       HB_MAX_NESTING_LEVEL,

       scratch};

    return get_path_at (c, gid,

      hb_array (font->coords, font->num_coords));

  }

  bool

  get_extents (hb_font_t *font,

         hb_codepoint_t gid,

         hb_extents_t<> *extents,

         hb_varc_scratch_t &scratch) const

  {

    hb_varc_context_t c {font,

       nullptr,

       extents,

       hb_decycler_t {},

       HB_MAX_GRAPH_EDGE_COUNT,

       HB_MAX_NESTING_LEVEL,

       scratch};

    return get_path_at (c, gid,

      hb_array (font->coords, font->num_coords));

  }

  bool sanitize (hb_sanitize_context_t *c) const

  {

    TRACE_SANITIZE (this);

    return_trace (version.sanitize (c) &&

      hb_barrier () &&

      version.major == 1 &&

      coverage.sanitize (c, this) &&

      varStore.sanitize (c, this) &&

      conditionList.sanitize (c, this) &&

      axisIndicesList.sanitize (c, this) &&

      glyphRecords.sanitize (c, this));

  }

  struct accelerator_t

  {

    friend struct VarComponent;

    accelerator_t (hb_face_t *face)

    {

      table = hb_sanitize_context_t ().reference_table<VARC> (face);

    }

    ~accelerator_t ()

    {

      auto *scratch = cached_scratch.get_relaxed ();

      if (scratch)

      {

  scratch->~hb_varc_scratch_t ();

  hb_free (scratch);

      }

      table.destroy ();

    }

    bool

    get_path (hb_font_t *font, hb_codepoint_t gid, hb_draw_session_t &draw_session) const

    {

      if (!table->has_data ()) return false;

      auto *scratch = acquire_scratch ();

      if (unlikely (!scratch)) return true;

      bool ret = table->get_path (font, gid, draw_session, *scratch);

      release_scratch (scratch);

      return ret;

    }

    bool

    get_extents (hb_font_t *font,

     hb_codepoint_t gid,

     hb_glyph_extents_t *extents) const

    {

#ifndef HB_NO_DRAW

      if (!table->has_data ()) return false;

      hb_extents_t<> f_extents;

      auto *scratch = acquire_scratch ();

      if (unlikely (!scratch)) return true;

      bool ret = table->get_extents (font, gid, &f_extents, *scratch);

      release_scratch (scratch);

      if (ret)

  *extents = f_extents.to_glyph_extents (font->x_scale < 0, font->y_scale < 0);

      return ret;

#else

      return false;

#endif

    }

    private:

    hb_varc_scratch_t *acquire_scratch () const

    {

      hb_varc_scratch_t *scratch = cached_scratch.get_acquire ();

      if (!scratch || unlikely (!cached_scratch.cmpexch (scratch, nullptr)))

      {

  scratch = (hb_varc_scratch_t *) hb_calloc (1, sizeof (hb_varc_scratch_t));

  if (unlikely (!scratch))

    return nullptr;

      }

      return scratch;

    }

    void release_scratch (hb_varc_scratch_t *scratch) const

    {

      if (!cached_scratch.cmpexch (nullptr, scratch))

      {

  scratch->~hb_varc_scratch_t ();

  hb_free (scratch);

      }

    }

    private:

    hb_blob_ptr_t<VARC> table;

    mutable hb_atomic_t<hb_varc_scratch_t *> cached_scratch;

  };

  bool has_data () const { return version.major != 0; }

  protected:

  FixedVersion<> version; /* Version identifier */

  Offset32To<Coverage> coverage;

  Offset32To<MultiItemVariationStore> varStore;

  Offset32To<ConditionList> conditionList;

  Offset32To<TupleList> axisIndicesList;

  Offset32To<CFF2Index/*Of<VarCompositeGlyph>*/> glyphRecords;

  public:

  DEFINE_SIZE_STATIC (24);

};

struct VARC_accelerator_t : VARC::accelerator_t {

  VARC_accelerator_t (hb_face_t *face) : VARC::accelerator_t (face) {}

};

#endif

//}

}

#endif  /* OT_VAR_VARC_VARC_HH */