kc3-lang/harfbuzz/src/hb-font.h

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• Hash : ab2d3ec5
  Author :
  Date : 2019-08-14T18:42:51
  

  [var] Implement hb_font_get_var_coords_design
  
  Hold design coords and simulate when normalized coords are set directly.
  

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• src/hb-font.h

• /*
   * Copyright © 2009  Red Hat, 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
   */
  
  #ifndef HB_H_IN
  #error "Include <hb.h> instead."
  #endif
  
  #ifndef HB_FONT_H
  #define HB_FONT_H
  
  #include "hb-common.h"
  #include "hb-face.h"
  #include "hb-draw.h"
  
  HB_BEGIN_DECLS
  
  
  typedef struct hb_font_t hb_font_t;
  
  
  /*
   * hb_font_funcs_t
   */
  
  typedef struct hb_font_funcs_t hb_font_funcs_t;
  
  HB_EXTERN hb_font_funcs_t *
  hb_font_funcs_create (void);
  
  HB_EXTERN hb_font_funcs_t *
  hb_font_funcs_get_empty (void);
  
  HB_EXTERN hb_font_funcs_t *
  hb_font_funcs_reference (hb_font_funcs_t *ffuncs);
  
  HB_EXTERN void
  hb_font_funcs_destroy (hb_font_funcs_t *ffuncs);
  
  HB_EXTERN 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);
  
  
  HB_EXTERN void *
  hb_font_funcs_get_user_data (hb_font_funcs_t    *ffuncs,
  			     hb_user_data_key_t *key);
  
  
  HB_EXTERN void
  hb_font_funcs_make_immutable (hb_font_funcs_t *ffuncs);
  
  HB_EXTERN hb_bool_t
  hb_font_funcs_is_immutable (hb_font_funcs_t *ffuncs);
  
  
  /* font and glyph extents */
  
  /* Note that typically ascender is positive and descender negative in coordinate systems that grow up. */
  typedef struct hb_font_extents_t
  {
    hb_position_t ascender; /* typographic ascender. */
    hb_position_t descender; /* typographic descender. */
    hb_position_t line_gap; /* suggested line spacing gap. */
    /*< private >*/
    hb_position_t reserved9;
    hb_position_t reserved8;
    hb_position_t reserved7;
    hb_position_t reserved6;
    hb_position_t reserved5;
    hb_position_t reserved4;
    hb_position_t reserved3;
    hb_position_t reserved2;
    hb_position_t reserved1;
  } hb_font_extents_t;
  
  /* Note that height is negative in coordinate systems that grow up. */
  typedef struct hb_glyph_extents_t
  {
    hb_position_t x_bearing; /* left side of glyph from origin. */
    hb_position_t y_bearing; /* top side of glyph from origin. */
    hb_position_t width; /* distance from left to right side. */
    hb_position_t height; /* distance from top to bottom side. */
  } hb_glyph_extents_t;
  
  /* func types */
  
  typedef hb_bool_t (*hb_font_get_font_extents_func_t) (hb_font_t *font, void *font_data,
  						       hb_font_extents_t *extents,
  						       void *user_data);
  typedef hb_font_get_font_extents_func_t hb_font_get_font_h_extents_func_t;
  typedef hb_font_get_font_extents_func_t hb_font_get_font_v_extents_func_t;
  
  
  typedef hb_bool_t (*hb_font_get_nominal_glyph_func_t) (hb_font_t *font, void *font_data,
  						       hb_codepoint_t unicode,
  						       hb_codepoint_t *glyph,
  						       void *user_data);
  typedef hb_bool_t (*hb_font_get_variation_glyph_func_t) (hb_font_t *font, void *font_data,
  							 hb_codepoint_t unicode, hb_codepoint_t variation_selector,
  							 hb_codepoint_t *glyph,
  							 void *user_data);
  
  typedef unsigned int (*hb_font_get_nominal_glyphs_func_t) (hb_font_t *font, void *font_data,
  							   unsigned int count,
  							   const hb_codepoint_t *first_unicode,
  							   unsigned int unicode_stride,
  							   hb_codepoint_t *first_glyph,
  							   unsigned int glyph_stride,
  							   void *user_data);
  
  
  typedef hb_position_t (*hb_font_get_glyph_advance_func_t) (hb_font_t *font, void *font_data,
  							   hb_codepoint_t glyph,
  							   void *user_data);
  typedef hb_font_get_glyph_advance_func_t hb_font_get_glyph_h_advance_func_t;
  typedef hb_font_get_glyph_advance_func_t hb_font_get_glyph_v_advance_func_t;
  
  typedef void (*hb_font_get_glyph_advances_func_t) (hb_font_t* font, void* font_data,
  						   unsigned int count,
  						   const hb_codepoint_t *first_glyph,
  						   unsigned glyph_stride,
  						   hb_position_t *first_advance,
  						   unsigned advance_stride,
  						   void *user_data);
  typedef hb_font_get_glyph_advances_func_t hb_font_get_glyph_h_advances_func_t;
  typedef hb_font_get_glyph_advances_func_t hb_font_get_glyph_v_advances_func_t;
  
  typedef hb_bool_t (*hb_font_get_glyph_origin_func_t) (hb_font_t *font, void *font_data,
  						      hb_codepoint_t glyph,
  						      hb_position_t *x, hb_position_t *y,
  						      void *user_data);
  typedef hb_font_get_glyph_origin_func_t hb_font_get_glyph_h_origin_func_t;
  typedef hb_font_get_glyph_origin_func_t hb_font_get_glyph_v_origin_func_t;
  
  typedef hb_position_t (*hb_font_get_glyph_kerning_func_t) (hb_font_t *font, void *font_data,
  							   hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
  							   void *user_data);
  typedef hb_font_get_glyph_kerning_func_t hb_font_get_glyph_h_kerning_func_t;
  
  
  typedef hb_bool_t (*hb_font_get_glyph_extents_func_t) (hb_font_t *font, void *font_data,
  						       hb_codepoint_t glyph,
  						       hb_glyph_extents_t *extents,
  						       void *user_data);
  typedef hb_bool_t (*hb_font_get_glyph_contour_point_func_t) (hb_font_t *font, void *font_data,
  							     hb_codepoint_t glyph, unsigned int point_index,
  							     hb_position_t *x, hb_position_t *y,
  							     void *user_data);
  
  
  typedef hb_bool_t (*hb_font_get_glyph_name_func_t) (hb_font_t *font, void *font_data,
  						    hb_codepoint_t glyph,
  						    char *name, unsigned int size,
  						    void *user_data);
  typedef hb_bool_t (*hb_font_get_glyph_from_name_func_t) (hb_font_t *font, void *font_data,
  							 const char *name, int len, /* -1 means nul-terminated */
  							 hb_codepoint_t *glyph,
  							 void *user_data);
  
  
  /* func setters */
  
  /**
   * hb_font_funcs_set_font_h_extents_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 1.1.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_font_h_extents_func (hb_font_funcs_t *ffuncs,
  				       hb_font_get_font_h_extents_func_t func,
  				       void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_font_v_extents_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 1.1.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_font_v_extents_func (hb_font_funcs_t *ffuncs,
  				       hb_font_get_font_v_extents_func_t func,
  				       void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_nominal_glyph_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 1.2.3
   **/
  HB_EXTERN void
  hb_font_funcs_set_nominal_glyph_func (hb_font_funcs_t *ffuncs,
  				      hb_font_get_nominal_glyph_func_t func,
  				      void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_nominal_glyphs_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 2.0.0
   **/
  HB_EXTERN void
  hb_font_funcs_set_nominal_glyphs_func (hb_font_funcs_t *ffuncs,
  				       hb_font_get_nominal_glyphs_func_t func,
  				       void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_variation_glyph_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 1.2.3
   **/
  HB_EXTERN void
  hb_font_funcs_set_variation_glyph_func (hb_font_funcs_t *ffuncs,
  					hb_font_get_variation_glyph_func_t func,
  					void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_h_advance_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 0.9.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_h_advance_func (hb_font_funcs_t *ffuncs,
  					hb_font_get_glyph_h_advance_func_t func,
  					void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_v_advance_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 0.9.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_v_advance_func (hb_font_funcs_t *ffuncs,
  					hb_font_get_glyph_v_advance_func_t func,
  					void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_h_advances_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 1.8.6
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_h_advances_func (hb_font_funcs_t *ffuncs,
  					hb_font_get_glyph_h_advances_func_t func,
  					void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_v_advances_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 1.8.6
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_v_advances_func (hb_font_funcs_t *ffuncs,
  					hb_font_get_glyph_v_advances_func_t func,
  					void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_h_origin_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 0.9.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_h_origin_func (hb_font_funcs_t *ffuncs,
  				       hb_font_get_glyph_h_origin_func_t func,
  				       void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_v_origin_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 0.9.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_v_origin_func (hb_font_funcs_t *ffuncs,
  				       hb_font_get_glyph_v_origin_func_t func,
  				       void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_h_kerning_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 0.9.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_h_kerning_func (hb_font_funcs_t *ffuncs,
  					hb_font_get_glyph_h_kerning_func_t func,
  					void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_extents_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 0.9.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_extents_func (hb_font_funcs_t *ffuncs,
  				      hb_font_get_glyph_extents_func_t func,
  				      void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_contour_point_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 0.9.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_contour_point_func (hb_font_funcs_t *ffuncs,
  					    hb_font_get_glyph_contour_point_func_t func,
  					    void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_name_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 0.9.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_name_func (hb_font_funcs_t *ffuncs,
  				   hb_font_get_glyph_name_func_t func,
  				   void *user_data, hb_destroy_func_t destroy);
  
  /**
   * hb_font_funcs_set_glyph_from_name_func:
   * @ffuncs: font functions.
   * @func: (closure user_data) (destroy destroy) (scope notified):
   * @user_data:
   * @destroy:
   *
   *
   *
   * Since: 0.9.2
   **/
  HB_EXTERN void
  hb_font_funcs_set_glyph_from_name_func (hb_font_funcs_t *ffuncs,
  					hb_font_get_glyph_from_name_func_t func,
  					void *user_data, hb_destroy_func_t destroy);
  
  /* func dispatch */
  
  HB_EXTERN hb_bool_t
  hb_font_get_h_extents (hb_font_t *font,
  		       hb_font_extents_t *extents);
  HB_EXTERN hb_bool_t
  hb_font_get_v_extents (hb_font_t *font,
  		       hb_font_extents_t *extents);
  
  HB_EXTERN hb_bool_t
  hb_font_get_nominal_glyph (hb_font_t *font,
  			   hb_codepoint_t unicode,
  			   hb_codepoint_t *glyph);
  HB_EXTERN hb_bool_t
  hb_font_get_variation_glyph (hb_font_t *font,
  			     hb_codepoint_t unicode, hb_codepoint_t variation_selector,
  			     hb_codepoint_t *glyph);
  
  HB_EXTERN unsigned int
  hb_font_get_nominal_glyphs (hb_font_t *font,
  			    unsigned int count,
  			    const hb_codepoint_t *first_unicode,
  			    unsigned int unicode_stride,
  			    hb_codepoint_t *first_glyph,
  			    unsigned int glyph_stride);
  
  HB_EXTERN hb_position_t
  hb_font_get_glyph_h_advance (hb_font_t *font,
  			     hb_codepoint_t glyph);
  HB_EXTERN hb_position_t
  hb_font_get_glyph_v_advance (hb_font_t *font,
  			     hb_codepoint_t glyph);
  
  HB_EXTERN void
  hb_font_get_glyph_h_advances (hb_font_t* font,
  			      unsigned int count,
  			      const hb_codepoint_t *first_glyph,
  			      unsigned glyph_stride,
  			      hb_position_t *first_advance,
  			      unsigned advance_stride);
  HB_EXTERN void
  hb_font_get_glyph_v_advances (hb_font_t* font,
  			      unsigned int count,
  			      const hb_codepoint_t *first_glyph,
  			      unsigned glyph_stride,
  			      hb_position_t *first_advance,
  			      unsigned advance_stride);
  
  HB_EXTERN 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);
  HB_EXTERN 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);
  
  HB_EXTERN hb_position_t
  hb_font_get_glyph_h_kerning (hb_font_t *font,
  			     hb_codepoint_t left_glyph, hb_codepoint_t right_glyph);
  
  HB_EXTERN hb_bool_t
  hb_font_get_glyph_extents (hb_font_t *font,
  			   hb_codepoint_t glyph,
  			   hb_glyph_extents_t *extents);
  
  HB_EXTERN 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);
  
  HB_EXTERN hb_bool_t
  hb_font_get_glyph_name (hb_font_t *font,
  			hb_codepoint_t glyph,
  			char *name, unsigned int size);
  HB_EXTERN 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);
  
  
  /* high-level funcs, with fallback */
  
  /* Calls either hb_font_get_nominal_glyph() if variation_selector is 0,
   * otherwise calls hb_font_get_variation_glyph(). */
  HB_EXTERN hb_bool_t
  hb_font_get_glyph (hb_font_t *font,
  		   hb_codepoint_t unicode, hb_codepoint_t variation_selector,
  		   hb_codepoint_t *glyph);
  
  HB_EXTERN void
  hb_font_get_extents_for_direction (hb_font_t *font,
  				   hb_direction_t direction,
  				   hb_font_extents_t *extents);
  HB_EXTERN 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);
  HB_EXTERN void
  hb_font_get_glyph_advances_for_direction (hb_font_t* font,
  					  hb_direction_t direction,
  					  unsigned int count,
  					  const hb_codepoint_t *first_glyph,
  					  unsigned glyph_stride,
  					  hb_position_t *first_advance,
  					  unsigned advance_stride);
  HB_EXTERN 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);
  HB_EXTERN 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);
  HB_EXTERN 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);
  
  HB_EXTERN 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);
  
  HB_EXTERN 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);
  
  HB_EXTERN 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);
  
  /* Generates gidDDD if glyph has no name. */
  HB_EXTERN void
  hb_font_glyph_to_string (hb_font_t *font,
  			 hb_codepoint_t glyph,
  			 char *s, unsigned int size);
  /* Parses gidDDD and uniUUUU strings automatically. */
  HB_EXTERN 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);
  
  
  /*
   * hb_font_t
   */
  
  /* Fonts are very light-weight objects */
  
  HB_EXTERN hb_font_t *
  hb_font_create (hb_face_t *face);
  
  HB_EXTERN hb_font_t *
  hb_font_create_sub_font (hb_font_t *parent);
  
  HB_EXTERN hb_font_t *
  hb_font_get_empty (void);
  
  HB_EXTERN hb_font_t *
  hb_font_reference (hb_font_t *font);
  
  HB_EXTERN void
  hb_font_destroy (hb_font_t *font);
  
  HB_EXTERN 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);
  
  
  HB_EXTERN void *
  hb_font_get_user_data (hb_font_t          *font,
  		       hb_user_data_key_t *key);
  
  HB_EXTERN void
  hb_font_make_immutable (hb_font_t *font);
  
  HB_EXTERN hb_bool_t
  hb_font_is_immutable (hb_font_t *font);
  
  HB_EXTERN void
  hb_font_set_parent (hb_font_t *font,
  		    hb_font_t *parent);
  
  HB_EXTERN hb_font_t *
  hb_font_get_parent (hb_font_t *font);
  
  HB_EXTERN void
  hb_font_set_face (hb_font_t *font,
  		  hb_face_t *face);
  
  HB_EXTERN hb_face_t *
  hb_font_get_face (hb_font_t *font);
  
  
  HB_EXTERN void
  hb_font_set_funcs (hb_font_t         *font,
  		   hb_font_funcs_t   *klass,
  		   void              *font_data,
  		   hb_destroy_func_t  destroy);
  
  /* Be *very* careful with this function! */
  HB_EXTERN void
  hb_font_set_funcs_data (hb_font_t         *font,
  			void              *font_data,
  			hb_destroy_func_t  destroy);
  
  
  HB_EXTERN void
  hb_font_set_scale (hb_font_t *font,
  		   int x_scale,
  		   int y_scale);
  
  HB_EXTERN void
  hb_font_get_scale (hb_font_t *font,
  		   int *x_scale,
  		   int *y_scale);
  
  /*
   * A zero value means "no hinting in that direction"
   */
  HB_EXTERN void
  hb_font_set_ppem (hb_font_t *font,
  		  unsigned int x_ppem,
  		  unsigned int y_ppem);
  
  HB_EXTERN void
  hb_font_get_ppem (hb_font_t *font,
  		  unsigned int *x_ppem,
  		  unsigned int *y_ppem);
  
  /*
   * Point size per EM.  Used for optical-sizing in CoreText.
   * A value of zero means "not set".
   */
  HB_EXTERN void
  hb_font_set_ptem (hb_font_t *font, float ptem);
  
  HB_EXTERN float
  hb_font_get_ptem (hb_font_t *font);
  
  HB_EXTERN void
  hb_font_set_variations (hb_font_t *font,
  			const hb_variation_t *variations,
  			unsigned int variations_length);
  
  HB_EXTERN void
  hb_font_set_var_coords_design (hb_font_t *font,
  			       const float *coords,
  			       unsigned int coords_length);
  
  HB_EXTERN const float *
  hb_font_get_var_coords_design (hb_font_t *font,
  			       unsigned int *length);
  
  HB_EXTERN void
  hb_font_set_var_coords_normalized (hb_font_t *font,
  				   const int *coords, /* 2.14 normalized */
  				   unsigned int coords_length);
  
  HB_EXTERN const int *
  hb_font_get_var_coords_normalized (hb_font_t *font,
  				   unsigned int *length);
  
  HB_EXTERN void
  hb_font_set_var_named_instance (hb_font_t *font,
  				unsigned instance_index);
  
  HB_EXTERN hb_bool_t
  hb_font_draw_glyph (hb_font_t *font, hb_codepoint_t glyph,
  		    const hb_draw_funcs_t *funcs, void *user_data);
  
  HB_END_DECLS
  
  #endif /* HB_FONT_H */
  

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