text: /*
   * Copyright © 2009  Red Hat, Inc.
   * Copyright © 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
   */
  
  #include "hb-private.hh"
  
  #include "hb-ot-layout-private.hh"
  
  #include "hb-font-private.hh"
  #include "hb-open-file-private.hh"
  #include "hb-ot-head-table.hh"
  #include "hb-ot-maxp-table.hh"
  
  #include "hb-cache-private.hh"
  
  #include <string.h>
  
  
  /*
   * hb_font_funcs_t
   */
  
  static hb_bool_t
  hb_font_get_glyph_nil (hb_font_t *font,
  		       void *font_data HB_UNUSED,
  		       hb_codepoint_t unicode,
  		       hb_codepoint_t variation_selector,
  		       hb_codepoint_t *glyph,
  		       void *user_data HB_UNUSED)
  {
    if (font->parent)
      return font->parent->get_glyph (unicode, variation_selector, glyph);
  
    *glyph = 0;
    return false;
  }
  
  static hb_position_t
  hb_font_get_glyph_h_advance_nil (hb_font_t *font,
  				 void *font_data HB_UNUSED,
  				 hb_codepoint_t glyph,
  				 void *user_data HB_UNUSED)
  {
    if (font->parent)
      return font->parent_scale_x_distance (font->parent->get_glyph_h_advance (glyph));
  
    return font->x_scale;
  }
  
  static hb_position_t
  hb_font_get_glyph_v_advance_nil (hb_font_t *font,
  				 void *font_data HB_UNUSED,
  				 hb_codepoint_t glyph,
  				 void *user_data HB_UNUSED)
  {
    if (font->parent)
      return font->parent_scale_y_distance (font->parent->get_glyph_v_advance (glyph));
  
    return font->y_scale;
  }
  
  static hb_bool_t
  hb_font_get_glyph_h_origin_nil (hb_font_t *font,
  				void *font_data HB_UNUSED,
  				hb_codepoint_t glyph,
  				hb_position_t *x,
  				hb_position_t *y,
  				void *user_data HB_UNUSED)
  {
    if (font->parent) {
      hb_bool_t ret = font->parent->get_glyph_h_origin (glyph, x, y);
      if (ret)
        font->parent_scale_position (x, y);
      return ret;
    }
  
    *x = *y = 0;
    return false;
  }
  
  static hb_bool_t
  hb_font_get_glyph_v_origin_nil (hb_font_t *font,
  				void *font_data HB_UNUSED,
  				hb_codepoint_t glyph,
  				hb_position_t *x,
  				hb_position_t *y,
  				void *user_data HB_UNUSED)
  {
    if (font->parent) {
      hb_bool_t ret = font->parent->get_glyph_v_origin (glyph, x, y);
      if (ret)
        font->parent_scale_position (x, y);
      return ret;
    }
  
    *x = *y = 0;
    return false;
  }
  
  static hb_position_t
  hb_font_get_glyph_h_kerning_nil (hb_font_t *font,
  				 void *font_data HB_UNUSED,
  				 hb_codepoint_t left_glyph,
  				 hb_codepoint_t right_glyph,
  				 void *user_data HB_UNUSED)
  {
    if (font->parent)
      return font->parent_scale_x_distance (font->parent->get_glyph_h_kerning (left_glyph, right_glyph));
  
    return 0;
  }
  
  static hb_position_t
  hb_font_get_glyph_v_kerning_nil (hb_font_t *font,
  				 void *font_data HB_UNUSED,
  				 hb_codepoint_t top_glyph,
  				 hb_codepoint_t bottom_glyph,
  				 void *user_data HB_UNUSED)
  {
    if (font->parent)
      return font->parent_scale_y_distance (font->parent->get_glyph_v_kerning (top_glyph, bottom_glyph));
  
    return 0;
  }
  
  static hb_bool_t
  hb_font_get_glyph_extents_nil (hb_font_t *font,
  			       void *font_data HB_UNUSED,
  			       hb_codepoint_t glyph,
  			       hb_glyph_extents_t *extents,
  			       void *user_data HB_UNUSED)
  {
    if (font->parent) {
      hb_bool_t ret = font->parent->get_glyph_extents (glyph, extents);
      if (ret) {
        font->parent_scale_position (&extents->x_bearing, &extents->y_bearing);
        font->parent_scale_distance (&extents->width, &extents->height);
      }
      return ret;
    }
  
    memset (extents, 0, sizeof (*extents));
    return false;
  }
  
  static hb_bool_t
  hb_font_get_glyph_contour_point_nil (hb_font_t *font,
  				     void *font_data HB_UNUSED,
  				     hb_codepoint_t glyph,
  				     unsigned int point_index,
  				     hb_position_t *x,
  				     hb_position_t *y,
  				     void *user_data HB_UNUSED)
  {
    if (font->parent) {
      hb_bool_t ret = font->parent->get_glyph_contour_point (glyph, point_index, x, y);
      if (ret)
        font->parent_scale_position (x, y);
      return ret;
    }
  
    *x = *y = 0;
    return false;
  }
  
  static hb_bool_t
  hb_font_get_glyph_name_nil (hb_font_t *font,
  			    void *font_data HB_UNUSED,
  			    hb_codepoint_t glyph,
  			    char *name, unsigned int size,
  			    void *user_data HB_UNUSED)
  {
    if (font->parent)
      return font->parent->get_glyph_name (glyph, name, size);
  
    if (size) *name = '\0';
    return false;
  }
  
  static hb_bool_t
  hb_font_get_glyph_from_name_nil (hb_font_t *font,
  				 void *font_data HB_UNUSED,
  				 const char *name, int len, /* -1 means nul-terminated */
  				 hb_codepoint_t *glyph,
  				 void *user_data HB_UNUSED)
  {
    if (font->parent)
      return font->parent->get_glyph_from_name (name, len, glyph);
  
    *glyph = 0;
    return false;
  }
  
  
  static const hb_font_funcs_t _hb_font_funcs_nil = {
    HB_OBJECT_HEADER_STATIC,
  
    true, /* immutable */
  
    {
  #define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_nil,
      HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
  #undef HB_FONT_FUNC_IMPLEMENT
    }
  };
  
  
  /**
   * hb_font_funcs_create: (Xconstructor)
   *
   * 
   *
   * Return value: (transfer full): 
   *
   * Since: 1.0
   **/
  hb_font_funcs_t *
  hb_font_funcs_create (void)
  {
    hb_font_funcs_t *ffuncs;
  
    if (!(ffuncs = hb_object_create<hb_font_funcs_t> ()))
      return hb_font_funcs_get_empty ();
  
    ffuncs->get = _hb_font_funcs_nil.get;
  
    return ffuncs;
  }
  
  /**
   * hb_font_funcs_get_empty:
   *
   * 
   *
   * Return value: (transfer full): 
   *
   * Since: 1.0
   **/
  hb_font_funcs_t *
  hb_font_funcs_get_empty (void)
  {
    return const_cast<hb_font_funcs_t *> (&_hb_font_funcs_nil);
  }
  
  /**
   * hb_font_funcs_reference: (skip)
   * @ffuncs: font functions.
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_font_funcs_t *
  hb_font_funcs_reference (hb_font_funcs_t *ffuncs)
  {
    return hb_object_reference (ffuncs);
  }
  
  /**
   * hb_font_funcs_destroy: (skip)
   * @ffuncs: font functions.
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_funcs_destroy (hb_font_funcs_t *ffuncs)
  {
    if (!hb_object_destroy (ffuncs)) return;
  
  #define HB_FONT_FUNC_IMPLEMENT(name) if (ffuncs->destroy.name) \
    ffuncs->destroy.name (ffuncs->user_data.name);
    HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
  #undef HB_FONT_FUNC_IMPLEMENT
  
    free (ffuncs);
  }
  
  /**
   * hb_font_funcs_set_user_data: (skip)
   * @ffuncs: font functions.
   * @key: 
   * @data: 
   * @destroy: 
   * @replace: 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_funcs_set_user_data (hb_font_funcs_t    *ffuncs,
  			     hb_user_data_key_t *key,
  			     void *              data,
  			     hb_destroy_func_t   destroy,
  			     hb_bool_t           replace)
  {
    return hb_object_set_user_data (ffuncs, key, data, destroy, replace);
  }
  
  /**
   * hb_font_funcs_get_user_data: (skip)
   * @ffuncs: font functions.
   * @key: 
   *
   * 
   *
   * Return value: (transfer none): 
   *
   * Since: 1.0
   **/
  void *
  hb_font_funcs_get_user_data (hb_font_funcs_t    *ffuncs,
  			     hb_user_data_key_t *key)
  {
    return hb_object_get_user_data (ffuncs, key);
  }
  
  
  /**
   * hb_font_funcs_make_immutable:
   * @ffuncs: font functions.
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_funcs_make_immutable (hb_font_funcs_t *ffuncs)
  {
    if (unlikely (hb_object_is_inert (ffuncs)))
      return;
  
    ffuncs->immutable = true;
  }
  
  /**
   * hb_font_funcs_is_immutable:
   * @ffuncs: font functions.
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_funcs_is_immutable (hb_font_funcs_t *ffuncs)
  {
    return ffuncs->immutable;
  }
  
  
  #define HB_FONT_FUNC_IMPLEMENT(name) \
                                                                           \
  void                                                                     \
  hb_font_funcs_set_##name##_func (hb_font_funcs_t             *ffuncs,    \
                                   hb_font_get_##name##_func_t  func,      \
                                   void                        *user_data, \
                                   hb_destroy_func_t            destroy)   \
  {                                                                        \
    if (ffuncs->immutable) {                                               \
      if (destroy)                                                         \
        destroy (user_data);                                               \
      return;                                                              \
    }                                                                      \
                                                                           \
    if (ffuncs->destroy.name)                                              \
      ffuncs->destroy.name (ffuncs->user_data.name);                       \
                                                                           \
    if (func) {                                                            \
      ffuncs->get.name = func;                                             \
      ffuncs->user_data.name = user_data;                                  \
      ffuncs->destroy.name = destroy;                                      \
    } else {                                                               \
      ffuncs->get.name = hb_font_get_##name##_nil;                         \
      ffuncs->user_data.name = NULL;                                       \
      ffuncs->destroy.name = NULL;                                         \
    }                                                                      \
  }
  
  HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
  #undef HB_FONT_FUNC_IMPLEMENT
  
  
  /* Public getters */
  
  /**
   * hb_font_get_glyph:
   * @font: a font.
   * @unicode: 
   * @variation_selector: 
   * @glyph: (out): 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_get_glyph (hb_font_t *font,
  		   hb_codepoint_t unicode, hb_codepoint_t variation_selector,
  		   hb_codepoint_t *glyph)
  {
    return font->get_glyph (unicode, variation_selector, glyph);
  }
  
  /**
   * hb_font_get_glyph_h_advance:
   * @font: a font.
   * @glyph: 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_position_t
  hb_font_get_glyph_h_advance (hb_font_t *font,
  			     hb_codepoint_t glyph)
  {
    return font->get_glyph_h_advance (glyph);
  }
  
  /**
   * hb_font_get_glyph_v_advance:
   * @font: a font.
   * @glyph: 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_position_t
  hb_font_get_glyph_v_advance (hb_font_t *font,
  			     hb_codepoint_t glyph)
  {
    return font->get_glyph_v_advance (glyph);
  }
  
  /**
   * hb_font_get_glyph_h_origin:
   * @font: a font.
   * @glyph: 
   * @x: (out): 
   * @y: (out): 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_get_glyph_h_origin (hb_font_t *font,
  			    hb_codepoint_t glyph,
  			    hb_position_t *x, hb_position_t *y)
  {
    return font->get_glyph_h_origin (glyph, x, y);
  }
  
  /**
   * hb_font_get_glyph_v_origin:
   * @font: a font.
   * @glyph: 
   * @x: (out): 
   * @y: (out): 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_get_glyph_v_origin (hb_font_t *font,
  			    hb_codepoint_t glyph,
  			    hb_position_t *x, hb_position_t *y)
  {
    return font->get_glyph_v_origin (glyph, x, y);
  }
  
  /**
   * hb_font_get_glyph_h_kerning:
   * @font: a font.
   * @left_glyph: 
   * @right_glyph: 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_position_t
  hb_font_get_glyph_h_kerning (hb_font_t *font,
  			     hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
  {
    return font->get_glyph_h_kerning (left_glyph, right_glyph);
  }
  
  /**
   * hb_font_get_glyph_v_kerning:
   * @font: a font.
   * @top_glyph: 
   * @bottom_glyph: 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_position_t
  hb_font_get_glyph_v_kerning (hb_font_t *font,
  			     hb_codepoint_t top_glyph, hb_codepoint_t bottom_glyph)
  {
    return font->get_glyph_v_kerning (top_glyph, bottom_glyph);
  }
  
  /**
   * hb_font_get_glyph_extents:
   * @font: a font.
   * @glyph: 
   * @extents: (out): 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_get_glyph_extents (hb_font_t *font,
  			   hb_codepoint_t glyph,
  			   hb_glyph_extents_t *extents)
  {
    return font->get_glyph_extents (glyph, extents);
  }
  
  /**
   * hb_font_get_glyph_contour_point:
   * @font: a font.
   * @glyph: 
   * @point_index: 
   * @x: (out): 
   * @y: (out): 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_get_glyph_contour_point (hb_font_t *font,
  				 hb_codepoint_t glyph, unsigned int point_index,
  				 hb_position_t *x, hb_position_t *y)
  {
    return font->get_glyph_contour_point (glyph, point_index, x, y);
  }
  
  /**
   * hb_font_get_glyph_name:
   * @font: a font.
   * @glyph: 
   * @name: (array length=size): 
   * @size: 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_get_glyph_name (hb_font_t *font,
  			hb_codepoint_t glyph,
  			char *name, unsigned int size)
  {
    return font->get_glyph_name (glyph, name, size);
  }
  
  /**
   * hb_font_get_glyph_from_name:
   * @font: a font.
   * @name: (array length=len): 
   * @len: 
   * @glyph: (out): 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_get_glyph_from_name (hb_font_t *font,
  			     const char *name, int len, /* -1 means nul-terminated */
  			     hb_codepoint_t *glyph)
  {
    return font->get_glyph_from_name (name, len, glyph);
  }
  
  
  /* A bit higher-level, and with fallback */
  
  /**
   * hb_font_get_glyph_advance_for_direction:
   * @font: a font.
   * @glyph: 
   * @direction: 
   * @x: (out): 
   * @y: (out): 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_get_glyph_advance_for_direction (hb_font_t *font,
  					 hb_codepoint_t glyph,
  					 hb_direction_t direction,
  					 hb_position_t *x, hb_position_t *y)
  {
    return font->get_glyph_advance_for_direction (glyph, direction, x, y);
  }
  
  /**
   * hb_font_get_glyph_origin_for_direction:
   * @font: a font.
   * @glyph: 
   * @direction: 
   * @x: (out): 
   * @y: (out): 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_get_glyph_origin_for_direction (hb_font_t *font,
  					hb_codepoint_t glyph,
  					hb_direction_t direction,
  					hb_position_t *x, hb_position_t *y)
  {
    return font->get_glyph_origin_for_direction (glyph, direction, x, y);
  }
  
  /**
   * hb_font_add_glyph_origin_for_direction:
   * @font: a font.
   * @glyph: 
   * @direction: 
   * @x: (out): 
   * @y: (out): 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_add_glyph_origin_for_direction (hb_font_t *font,
  					hb_codepoint_t glyph,
  					hb_direction_t direction,
  					hb_position_t *x, hb_position_t *y)
  {
    return font->add_glyph_origin_for_direction (glyph, direction, x, y);
  }
  
  /**
   * hb_font_subtract_glyph_origin_for_direction:
   * @font: a font.
   * @glyph: 
   * @direction: 
   * @x: (out): 
   * @y: (out): 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_subtract_glyph_origin_for_direction (hb_font_t *font,
  					     hb_codepoint_t glyph,
  					     hb_direction_t direction,
  					     hb_position_t *x, hb_position_t *y)
  {
    return font->subtract_glyph_origin_for_direction (glyph, direction, x, y);
  }
  
  /**
   * hb_font_get_glyph_kerning_for_direction:
   * @font: a font.
   * @first_glyph: 
   * @second_glyph: 
   * @direction: 
   * @x: (out): 
   * @y: (out): 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_get_glyph_kerning_for_direction (hb_font_t *font,
  					 hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
  					 hb_direction_t direction,
  					 hb_position_t *x, hb_position_t *y)
  {
    return font->get_glyph_kerning_for_direction (first_glyph, second_glyph, direction, x, y);
  }
  
  /**
   * hb_font_get_glyph_extents_for_origin:
   * @font: a font.
   * @glyph: 
   * @direction: 
   * @extents: (out): 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_get_glyph_extents_for_origin (hb_font_t *font,
  				      hb_codepoint_t glyph,
  				      hb_direction_t direction,
  				      hb_glyph_extents_t *extents)
  {
    return font->get_glyph_extents_for_origin (glyph, direction, extents);
  }
  
  /**
   * hb_font_get_glyph_contour_point_for_origin:
   * @font: a font.
   * @glyph: 
   * @point_index: 
   * @direction: 
   * @x: (out): 
   * @y: (out): 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_get_glyph_contour_point_for_origin (hb_font_t *font,
  					    hb_codepoint_t glyph, unsigned int point_index,
  					    hb_direction_t direction,
  					    hb_position_t *x, hb_position_t *y)
  {
    return font->get_glyph_contour_point_for_origin (glyph, point_index, direction, x, y);
  }
  
  /* Generates gidDDD if glyph has no name. */
  /**
   * hb_font_glyph_to_string:
   * @font: a font.
   * @glyph: 
   * @s: (array length=size): 
   * @size: 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_glyph_to_string (hb_font_t *font,
  			 hb_codepoint_t glyph,
  			 char *s, unsigned int size)
  {
    font->glyph_to_string (glyph, s, size);
  }
  
  /* Parses gidDDD and uniUUUU strings automatically. */
  /**
   * hb_font_glyph_from_string:
   * @font: a font.
   * @s: (array length=len) (element-type uint8_t): 
   * @len: 
   * @glyph: (out): 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_glyph_from_string (hb_font_t *font,
  			   const char *s, int len, /* -1 means nul-terminated */
  			   hb_codepoint_t *glyph)
  {
    return font->glyph_from_string (s, len, glyph);
  }
  
  
  /*
   * hb_font_t
   */
  
  /**
   * hb_font_create: (Xconstructor)
   * @face: a face.
   *
   * 
   *
   * Return value: (transfer full): 
   *
   * Since: 1.0
   **/
  hb_font_t *
  hb_font_create (hb_face_t *face)
  {
    hb_font_t *font;
  
    if (unlikely (!face))
      face = hb_face_get_empty ();
    if (unlikely (hb_object_is_inert (face)))
      return hb_font_get_empty ();
    if (!(font = hb_object_create<hb_font_t> ()))
      return hb_font_get_empty ();
  
    hb_face_make_immutable (face);
    font->face = hb_face_reference (face);
    font->klass = hb_font_funcs_get_empty ();
  
    return font;
  }
  
  /**
   * hb_font_create_sub_font:
   * @parent: parent font.
   *
   * 
   *
   * Return value: (transfer full): 
   *
   * Since: 1.0
   **/
  hb_font_t *
  hb_font_create_sub_font (hb_font_t *parent)
  {
    if (unlikely (!parent))
      return hb_font_get_empty ();
  
    hb_font_t *font = hb_font_create (parent->face);
  
    if (unlikely (hb_object_is_inert (font)))
      return font;
  
    hb_font_make_immutable (parent);
    font->parent = hb_font_reference (parent);
  
    font->x_scale = parent->x_scale;
    font->y_scale = parent->y_scale;
    font->x_ppem = parent->x_ppem;
    font->y_ppem = parent->y_ppem;
  
    return font;
  }
  
  /**
   * hb_font_get_empty:
   *
   * 
   *
   * Return value: (transfer full)
   *
   * Since: 1.0
   **/
  hb_font_t *
  hb_font_get_empty (void)
  {
    static const hb_font_t _hb_font_nil = {
      HB_OBJECT_HEADER_STATIC,
  
      true, /* immutable */
  
      NULL, /* parent */
      const_cast<hb_face_t *> (&_hb_face_nil),
  
      0, /* x_scale */
      0, /* y_scale */
  
      0, /* x_ppem */
      0, /* y_ppem */
  
      const_cast<hb_font_funcs_t *> (&_hb_font_funcs_nil), /* klass */
      NULL, /* user_data */
      NULL, /* destroy */
  
      {
  #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INVALID,
  #include "hb-shaper-list.hh"
  #undef HB_SHAPER_IMPLEMENT
      }
    };
  
    return const_cast<hb_font_t *> (&_hb_font_nil);
  }
  
  /**
   * hb_font_reference: (skip)
   * @font: a font.
   *
   * 
   *
   * Return value: (transfer full): 
   *
   * Since: 1.0
   **/
  hb_font_t *
  hb_font_reference (hb_font_t *font)
  {
    return hb_object_reference (font);
  }
  
  /**
   * hb_font_destroy: (skip)
   * @font: a font.
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_destroy (hb_font_t *font)
  {
    if (!hb_object_destroy (font)) return;
  
  #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_DESTROY(shaper, font);
  #include "hb-shaper-list.hh"
  #undef HB_SHAPER_IMPLEMENT
  
    if (font->destroy)
      font->destroy (font->user_data);
  
    hb_font_destroy (font->parent);
    hb_face_destroy (font->face);
    hb_font_funcs_destroy (font->klass);
  
    free (font);
  }
  
  /**
   * hb_font_set_user_data: (skip)
   * @font: a font.
   * @key: 
   * @data: 
   * @destroy: 
   * @replace: 
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_set_user_data (hb_font_t          *font,
  		       hb_user_data_key_t *key,
  		       void *              data,
  		       hb_destroy_func_t   destroy,
  		       hb_bool_t           replace)
  {
    return hb_object_set_user_data (font, key, data, destroy, replace);
  }
  
  /**
   * hb_font_get_user_data: (skip)
   * @font: a font.
   * @key: 
   *
   * 
   *
   * Return value: (transfer none): 
   *
   * Since: 1.0
   **/
  void *
  hb_font_get_user_data (hb_font_t          *font,
  		       hb_user_data_key_t *key)
  {
    return hb_object_get_user_data (font, key);
  }
  
  /**
   * hb_font_make_immutable:
   * @font: a font.
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_make_immutable (hb_font_t *font)
  {
    if (unlikely (hb_object_is_inert (font)))
      return;
  
    font->immutable = true;
  }
  
  /**
   * hb_font_is_immutable:
   * @font: a font.
   *
   * 
   *
   * Return value: 
   *
   * Since: 1.0
   **/
  hb_bool_t
  hb_font_is_immutable (hb_font_t *font)
  {
    return font->immutable;
  }
  
  /**
   * hb_font_get_parent:
   * @font: a font.
   *
   * 
   *
   * Return value: (transfer none): 
   *
   * Since: 1.0
   **/
  hb_font_t *
  hb_font_get_parent (hb_font_t *font)
  {
    return font->parent;
  }
  
  /**
   * hb_font_get_face:
   * @font: a font.
   *
   * 
   *
   * Return value: (transfer none): 
   *
   * Since: 1.0
   **/
  hb_face_t *
  hb_font_get_face (hb_font_t *font)
  {
    return font->face;
  }
  
  
  /**
   * hb_font_set_funcs:
   * @font: a font.
   * @klass: (closure font_data) (destroy destroy) (scope notified):
   * @font_data: 
   * @destroy: 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_set_funcs (hb_font_t         *font,
  		   hb_font_funcs_t   *klass,
  		   void              *font_data,
  		   hb_destroy_func_t  destroy)
  {
    if (font->immutable) {
      if (destroy)
        destroy (font_data);
      return;
    }
  
    if (font->destroy)
      font->destroy (font->user_data);
  
    if (!klass)
      klass = hb_font_funcs_get_empty ();
  
    hb_font_funcs_reference (klass);
    hb_font_funcs_destroy (font->klass);
    font->klass = klass;
    font->user_data = font_data;
    font->destroy = destroy;
  }
  
  /**
   * hb_font_set_funcs_data:
   * @font: a font.
   * @font_data: (destroy destroy) (scope notified):
   * @destroy: 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_set_funcs_data (hb_font_t         *font,
  		        void              *font_data,
  		        hb_destroy_func_t  destroy)
  {
    /* Destroy user_data? */
    if (font->immutable) {
      if (destroy)
        destroy (font_data);
      return;
    }
  
    if (font->destroy)
      font->destroy (font->user_data);
  
    font->user_data = font_data;
    font->destroy = destroy;
  }
  
  
  /**
   * hb_font_set_scale:
   * @font: a font.
   * @x_scale: 
   * @y_scale: 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_set_scale (hb_font_t *font,
  		   int x_scale,
  		   int y_scale)
  {
    if (font->immutable)
      return;
  
    font->x_scale = x_scale;
    font->y_scale = y_scale;
  }
  
  /**
   * hb_font_get_scale:
   * @font: a font.
   * @x_scale: (out): 
   * @y_scale: (out): 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_get_scale (hb_font_t *font,
  		   int *x_scale,
  		   int *y_scale)
  {
    if (x_scale) *x_scale = font->x_scale;
    if (y_scale) *y_scale = font->y_scale;
  }
  
  /**
   * hb_font_set_ppem:
   * @font: a font.
   * @x_ppem: 
   * @y_ppem: 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_set_ppem (hb_font_t *font,
  		  unsigned int x_ppem,
  		  unsigned int y_ppem)
  {
    if (font->immutable)
      return;
  
    font->x_ppem = x_ppem;
    font->y_ppem = y_ppem;
  }
  
  /**
   * hb_font_get_ppem:
   * @font: a font.
   * @x_ppem: (out): 
   * @y_ppem: (out): 
   *
   * 
   *
   * Since: 1.0
   **/
  void
  hb_font_get_ppem (hb_font_t *font,
  		  unsigned int *x_ppem,
  		  unsigned int *y_ppem)
  {
    if (x_ppem) *x_ppem = font->x_ppem;
    if (y_ppem) *y_ppem = font->y_ppem;
  }
  