/*

 * Copyright © 2009  Red Hat, Inc.

 * Copyright © 2011  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_FACE_HH

#define HB_FACE_HH

#include "hb.hh"

#include "hb-shaper.hh"

#include "hb-shape-plan.hh"

#include "hb-ot-face.hh"

/*

 * hb_face_t

 */

#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INSTANTIATE_SHAPERS(shaper, face);

#include "hb-shaper-list.hh"

#undef HB_SHAPER_IMPLEMENT

struct hb_face_t

{

  hb_object_header_t header;

  unsigned int index;     /* Face index in a collection, zero-based. */

  mutable hb_atomic_t<unsigned> upem; /* Units-per-EM. */

  mutable hb_atomic_t<unsigned> num_glyphs;/* Number of glyphs. */

  hb_reference_table_func_t  reference_table_func;

  void                      *user_data;

  hb_destroy_func_t          destroy;

  hb_get_table_tags_func_t   get_table_tags_func;

  void                      *get_table_tags_user_data;

  hb_destroy_func_t          get_table_tags_destroy;

  hb_shaper_object_dataset_t<hb_face_t> data;/* Various shaper data. */

  hb_ot_face_t table;     /* All the face's tables. */

  /* Cache */

  struct plan_node_t

  {

    hb_shape_plan_t *shape_plan;

    plan_node_t *next;

  };

#ifndef HB_NO_SHAPER

  hb_atomic_t<plan_node_t *> shape_plans;

#endif

  hb_blob_t *reference_table (hb_tag_t tag) const

  {

    hb_blob_t *blob;

    if (unlikely (!reference_table_func))

      return hb_blob_get_empty ();

    blob = reference_table_func (/*Oh, well.*/const_cast<hb_face_t *> (this), tag, user_data);

    if (unlikely (!blob))

      return hb_blob_get_empty ();

    return blob;

  }

  unsigned int get_upem () const

  {

    unsigned int ret = upem;

    if (unlikely (!ret))

    {

      return load_upem ();

    }

    return ret;

  }

  unsigned int get_num_glyphs () const

  {

    unsigned int ret = num_glyphs;

    if (unlikely (ret == UINT_MAX))

      return load_num_glyphs ();

    return ret;

  }

  private:

  HB_INTERNAL unsigned int load_upem () const;

  HB_INTERNAL unsigned int load_num_glyphs () const;

};

DECLARE_NULL_INSTANCE (hb_face_t);

#endif /* HB_FACE_HH */