third_party/harfbuzz-ng/src/hb-font-private.hh - cobalt - Git at Google

 /*
  * 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_FONT_PRIVATE_HH
 #define HB_FONT_PRIVATE_HH

 #include "hb-private.hh"

 #include "hb-object-private.hh"
 #include "hb-face-private.hh"
 #include "hb-shaper-private.hh"


 /*
  * hb_font_funcs_t
  */

 #define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
   HB_FONT_FUNC_IMPLEMENT (glyph) \
   HB_FONT_FUNC_IMPLEMENT (glyph_h_advance) \
   HB_FONT_FUNC_IMPLEMENT (glyph_v_advance) \
   HB_FONT_FUNC_IMPLEMENT (glyph_h_origin) \
   HB_FONT_FUNC_IMPLEMENT (glyph_v_origin) \
   HB_FONT_FUNC_IMPLEMENT (glyph_h_kerning) \
   HB_FONT_FUNC_IMPLEMENT (glyph_v_kerning) \
   HB_FONT_FUNC_IMPLEMENT (glyph_extents) \
   HB_FONT_FUNC_IMPLEMENT (glyph_contour_point) \
   HB_FONT_FUNC_IMPLEMENT (glyph_name) \
   HB_FONT_FUNC_IMPLEMENT (glyph_from_name) \
   /* ^--- Add new callbacks here */

 struct hb_font_funcs_t {
   hb_object_header_t header;
   ASSERT_POD ();

   hb_bool_t immutable;

   struct {
 #define HB_FONT_FUNC_IMPLEMENT(name) void *name;
     HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_FONT_FUNC_IMPLEMENT
   } user_data;

   struct {
 #define HB_FONT_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
     HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_FONT_FUNC_IMPLEMENT
   } destroy;

   /* Don't access these directly.  Call font->get_*() instead. */
   union get_t {
     struct get_funcs_t {
 #define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_func_t name;
       HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_FONT_FUNC_IMPLEMENT
     } f;
     void (*array[VAR]) (void);
   } get;
 };


 /*
  * hb_font_t
  */

 struct hb_font_t {
   hb_object_header_t header;
   ASSERT_POD ();

   hb_bool_t immutable;

   hb_font_t *parent;
   hb_face_t *face;

   int x_scale;
   int y_scale;

   unsigned int x_ppem;
   unsigned int y_ppem;

   hb_font_funcs_t   *klass;
   void              *user_data;
   hb_destroy_func_t  destroy;

   struct hb_shaper_data_t shaper_data;


   /* Convert from font-space to user-space */
   inline hb_position_t em_scale_x (int16_t v) { return em_scale (v, this->x_scale); }
   inline hb_position_t em_scale_y (int16_t v) { return em_scale (v, this->y_scale); }

   /* Convert from parent-font user-space to our user-space */
   inline hb_position_t parent_scale_x_distance (hb_position_t v) {
     if (unlikely (parent && parent->x_scale != x_scale))
       return (hb_position_t) (v * (int64_t) this->x_scale / this->parent->x_scale);
     return v;
   }
   inline hb_position_t parent_scale_y_distance (hb_position_t v) {
     if (unlikely (parent && parent->y_scale != y_scale))
       return (hb_position_t) (v * (int64_t) this->y_scale / this->parent->y_scale);
     return v;
   }
   inline hb_position_t parent_scale_x_position (hb_position_t v) {
     return parent_scale_x_distance (v);
   }
   inline hb_position_t parent_scale_y_position (hb_position_t v) {
     return parent_scale_y_distance (v);
   }

   inline void parent_scale_distance (hb_position_t *x, hb_position_t *y) {
     *x = parent_scale_x_distance (*x);
     *y = parent_scale_y_distance (*y);
   }
   inline void parent_scale_position (hb_position_t *x, hb_position_t *y) {
     *x = parent_scale_x_position (*x);
     *y = parent_scale_y_position (*y);
   }


   /* Public getters */

   HB_INTERNAL bool has_func (unsigned int i);

   /* has_* ... */
 #define HB_FONT_FUNC_IMPLEMENT(name) \
   bool \
   has_##name##_func (void) \
   { \
     hb_font_funcs_t *funcs = this->klass; \
     unsigned int i = offsetof (hb_font_funcs_t::get_t::get_funcs_t, name) / sizeof (funcs->get.array[0]); \
     return has_func (i); \
   }
   HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_FONT_FUNC_IMPLEMENT

   inline hb_bool_t has_glyph (hb_codepoint_t unicode)
   {
     hb_codepoint_t glyph;
     return get_glyph (unicode, 0, &glyph);
   }

   inline hb_bool_t get_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector,
 			      hb_codepoint_t *glyph)
   {
     *glyph = 0;
     return klass->get.f.glyph (this, user_data,
 			       unicode, variation_selector, glyph,
 			       klass->user_data.glyph);
   }

   inline hb_position_t get_glyph_h_advance (hb_codepoint_t glyph)
   {
     return klass->get.f.glyph_h_advance (this, user_data,
 					 glyph,
 					 klass->user_data.glyph_h_advance);
   }

   inline hb_position_t get_glyph_v_advance (hb_codepoint_t glyph)
   {
     return klass->get.f.glyph_v_advance (this, user_data,
 					 glyph,
 					 klass->user_data.glyph_v_advance);
   }

   inline hb_bool_t get_glyph_h_origin (hb_codepoint_t glyph,
 				       hb_position_t *x, hb_position_t *y)
   {
     *x = *y = 0;
     return klass->get.f.glyph_h_origin (this, user_data,
 					glyph, x, y,
 					klass->user_data.glyph_h_origin);
   }

   inline hb_bool_t get_glyph_v_origin (hb_codepoint_t glyph,
 				       hb_position_t *x, hb_position_t *y)
   {
     *x = *y = 0;
     return klass->get.f.glyph_v_origin (this, user_data,
 					glyph, x, y,
 					klass->user_data.glyph_v_origin);
   }

   inline hb_position_t get_glyph_h_kerning (hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
   {
     return klass->get.f.glyph_h_kerning (this, user_data,
 					 left_glyph, right_glyph,
 					 klass->user_data.glyph_h_kerning);
   }

   inline hb_position_t get_glyph_v_kerning (hb_codepoint_t top_glyph, hb_codepoint_t bottom_glyph)
   {
     return klass->get.f.glyph_v_kerning (this, user_data,
 					 top_glyph, bottom_glyph,
 					 klass->user_data.glyph_v_kerning);
   }

   inline hb_bool_t get_glyph_extents (hb_codepoint_t glyph,
 				      hb_glyph_extents_t *extents)
   {
     memset (extents, 0, sizeof (*extents));
     return klass->get.f.glyph_extents (this, user_data,
 				       glyph,
 				       extents,
 				       klass->user_data.glyph_extents);
   }

   inline hb_bool_t get_glyph_contour_point (hb_codepoint_t glyph, unsigned int point_index,
 					    hb_position_t *x, hb_position_t *y)
   {
     *x = *y = 0;
     return klass->get.f.glyph_contour_point (this, user_data,
 					     glyph, point_index,
 					     x, y,
 					     klass->user_data.glyph_contour_point);
   }

   inline hb_bool_t get_glyph_name (hb_codepoint_t glyph,
 				   char *name, unsigned int size)
   {
     if (size) *name = '\0';
     return klass->get.f.glyph_name (this, user_data,
 				    glyph,
 				    name, size,
 				    klass->user_data.glyph_name);
   }

   inline hb_bool_t get_glyph_from_name (const char *name, int len, /* -1 means nul-terminated */
 					hb_codepoint_t *glyph)
   {
     *glyph = 0;
     if (len == -1) len = strlen (name);
     return klass->get.f.glyph_from_name (this, user_data,
 					 name, len,
 					 glyph,
 					 klass->user_data.glyph_from_name);
   }


   /* A bit higher-level, and with fallback */

   inline void get_glyph_advance_for_direction (hb_codepoint_t glyph,
 					       hb_direction_t direction,
 					       hb_position_t *x, hb_position_t *y)
   {
     if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
       *x = get_glyph_h_advance (glyph);
       *y = 0;
     } else {
       *x = 0;
       *y = get_glyph_v_advance (glyph);
     }
   }

   /* Internal only */
   inline void guess_v_origin_minus_h_origin (hb_codepoint_t glyph,
 					     hb_position_t *x, hb_position_t *y)
   {
     *x = get_glyph_h_advance (glyph) / 2;

     /* TODO use font_metrics.ascent */
     *y = y_scale;
   }

   inline void get_glyph_origin_for_direction (hb_codepoint_t glyph,
 					      hb_direction_t direction,
 					      hb_position_t *x, hb_position_t *y)
   {
     if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
     {
       if (!get_glyph_h_origin (glyph, x, y) &&
 	   get_glyph_v_origin (glyph, x, y))
       {
 	hb_position_t dx, dy;
 	guess_v_origin_minus_h_origin (glyph, &dx, &dy);
 	*x -= dx; *y -= dy;
       }
     }
     else
     {
       if (!get_glyph_v_origin (glyph, x, y) &&
 	   get_glyph_h_origin (glyph, x, y))
       {
 	hb_position_t dx, dy;
 	guess_v_origin_minus_h_origin (glyph, &dx, &dy);
 	*x += dx; *y += dy;
       }
     }
   }

   inline void add_glyph_h_origin (hb_codepoint_t glyph,
 				  hb_position_t *x, hb_position_t *y)
   {
     hb_position_t origin_x, origin_y;

     get_glyph_h_origin (glyph, &origin_x, &origin_y);

     *x += origin_x;
     *y += origin_y;
   }
   inline void add_glyph_v_origin (hb_codepoint_t glyph,
 				  hb_position_t *x, hb_position_t *y)
   {
     hb_position_t origin_x, origin_y;

     get_glyph_v_origin (glyph, &origin_x, &origin_y);

     *x += origin_x;
     *y += origin_y;
   }
   inline void add_glyph_origin_for_direction (hb_codepoint_t glyph,
 					      hb_direction_t direction,
 					      hb_position_t *x, hb_position_t *y)
   {
     hb_position_t origin_x, origin_y;

     get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y);

     *x += origin_x;
     *y += origin_y;
   }

   inline void subtract_glyph_h_origin (hb_codepoint_t glyph,
 				       hb_position_t *x, hb_position_t *y)
   {
     hb_position_t origin_x, origin_y;

     get_glyph_h_origin (glyph, &origin_x, &origin_y);

     *x -= origin_x;
     *y -= origin_y;
   }
   inline void subtract_glyph_v_origin (hb_codepoint_t glyph,
 				       hb_position_t *x, hb_position_t *y)
   {
     hb_position_t origin_x, origin_y;

     get_glyph_v_origin (glyph, &origin_x, &origin_y);

     *x -= origin_x;
     *y -= origin_y;
   }
   inline void subtract_glyph_origin_for_direction (hb_codepoint_t glyph,
 						   hb_direction_t direction,
 						   hb_position_t *x, hb_position_t *y)
   {
     hb_position_t origin_x, origin_y;

     get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y);

     *x -= origin_x;
     *y -= origin_y;
   }

   inline void get_glyph_kerning_for_direction (hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
 					       hb_direction_t direction,
 					       hb_position_t *x, hb_position_t *y)
   {
     if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
       *x = get_glyph_h_kerning (first_glyph, second_glyph);
       *y = 0;
     } else {
       *x = 0;
       *y = get_glyph_v_kerning (first_glyph, second_glyph);
     }
   }

   inline hb_bool_t get_glyph_extents_for_origin (hb_codepoint_t glyph,
 						 hb_direction_t direction,
 						 hb_glyph_extents_t *extents)
   {
     hb_bool_t ret = get_glyph_extents (glyph, extents);

     if (ret)
       subtract_glyph_origin_for_direction (glyph, direction, &extents->x_bearing, &extents->y_bearing);

     return ret;
   }

   inline hb_bool_t get_glyph_contour_point_for_origin (hb_codepoint_t glyph, unsigned int point_index,
 						       hb_direction_t direction,
 						       hb_position_t *x, hb_position_t *y)
   {
     hb_bool_t ret = get_glyph_contour_point (glyph, point_index, x, y);

     if (ret)
       subtract_glyph_origin_for_direction (glyph, direction, x, y);

     return ret;
   }

   /* Generates gidDDD if glyph has no name. */
   inline void
   glyph_to_string (hb_codepoint_t glyph,
 		   char *s, unsigned int size)
   {
     if (get_glyph_name (glyph, s, size)) return;

     if (size && snprintf (s, size, "gid%u", glyph) < 0)
       *s = '\0';
   }

   /* Parses gidDDD and uniUUUU strings automatically. */
   inline hb_bool_t
   glyph_from_string (const char *s, int len, /* -1 means nul-terminated */
 		     hb_codepoint_t *glyph)
   {
     if (get_glyph_from_name (s, len, glyph)) return true;

     if (len == -1) len = strlen (s);

     /* Straight glyph index. */
     if (hb_codepoint_parse (s, len, 10, glyph))
       return true;

     if (len > 3)
     {
       /* gidDDD syntax for glyph indices. */
       if (0 == strncmp (s, "gid", 3) &&
 	  hb_codepoint_parse (s + 3, len - 3, 10, glyph))
 	return true;

       /* uniUUUU and other Unicode character indices. */
       hb_codepoint_t unichar;
       if (0 == strncmp (s, "uni", 3) &&
 	  hb_codepoint_parse (s + 3, len - 3, 16, &unichar) &&
 	  get_glyph (unichar, 0, glyph))
 	return true;
     }

     return false;
   }

   private:
   inline hb_position_t em_scale (int16_t v, int scale) { return (hb_position_t) (v * (int64_t) scale / face->get_upem ()); }
 };

 #define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, font);
 #include "hb-shaper-list.hh"
 #undef HB_SHAPER_IMPLEMENT
 #undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS


 #endif /* HB_FONT_PRIVATE_HH */
	/*
	* 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_FONT_PRIVATE_HH
	#define HB_FONT_PRIVATE_HH

	#include "hb-private.hh"

	#include "hb-object-private.hh"
	#include "hb-face-private.hh"
	#include "hb-shaper-private.hh"



	/*
	* hb_font_funcs_t
	*/

	#define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
	HB_FONT_FUNC_IMPLEMENT (glyph) \
	HB_FONT_FUNC_IMPLEMENT (glyph_h_advance) \
	HB_FONT_FUNC_IMPLEMENT (glyph_v_advance) \
	HB_FONT_FUNC_IMPLEMENT (glyph_h_origin) \
	HB_FONT_FUNC_IMPLEMENT (glyph_v_origin) \
	HB_FONT_FUNC_IMPLEMENT (glyph_h_kerning) \
	HB_FONT_FUNC_IMPLEMENT (glyph_v_kerning) \
	HB_FONT_FUNC_IMPLEMENT (glyph_extents) \
	HB_FONT_FUNC_IMPLEMENT (glyph_contour_point) \
	HB_FONT_FUNC_IMPLEMENT (glyph_name) \
	HB_FONT_FUNC_IMPLEMENT (glyph_from_name) \
	/* ^--- Add new callbacks here */

	struct hb_font_funcs_t {
	hb_object_header_t header;
	ASSERT_POD ();

	hb_bool_t immutable;

	struct {
	#define HB_FONT_FUNC_IMPLEMENT(name) void *name;
	HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
	#undef HB_FONT_FUNC_IMPLEMENT
	} user_data;

	struct {
	#define HB_FONT_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
	HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
	#undef HB_FONT_FUNC_IMPLEMENT
	} destroy;

	/* Don't access these directly. Call font->get_() instead. /
	union get_t {
	struct get_funcs_t {
	#define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_func_t name;
	HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
	#undef HB_FONT_FUNC_IMPLEMENT
	} f;
	void (*array[VAR]) (void);
	} get;
	};



	/*
	* hb_font_t
	*/

	struct hb_font_t {
	hb_object_header_t header;
	ASSERT_POD ();

	hb_bool_t immutable;

	hb_font_t *parent;
	hb_face_t *face;

	int x_scale;
	int y_scale;

	unsigned int x_ppem;
	unsigned int y_ppem;

	hb_font_funcs_t *klass;
	void *user_data;
	hb_destroy_func_t destroy;

	struct hb_shaper_data_t shaper_data;


	/* Convert from font-space to user-space */
	inline hb_position_t em_scale_x (int16_t v) { return em_scale (v, this->x_scale); }
	inline hb_position_t em_scale_y (int16_t v) { return em_scale (v, this->y_scale); }

	/* Convert from parent-font user-space to our user-space */
	inline hb_position_t parent_scale_x_distance (hb_position_t v) {
	if (unlikely (parent && parent->x_scale != x_scale))
	return (hb_position_t) (v * (int64_t) this->x_scale / this->parent->x_scale);
	return v;
	}
	inline hb_position_t parent_scale_y_distance (hb_position_t v) {
	if (unlikely (parent && parent->y_scale != y_scale))
	return (hb_position_t) (v * (int64_t) this->y_scale / this->parent->y_scale);
	return v;
	}
	inline hb_position_t parent_scale_x_position (hb_position_t v) {
	return parent_scale_x_distance (v);
	}
	inline hb_position_t parent_scale_y_position (hb_position_t v) {
	return parent_scale_y_distance (v);
	}

	inline void parent_scale_distance (hb_position_t x, hb_position_t y) {
	x = parent_scale_x_distance (x);
	y = parent_scale_y_distance (y);
	}
	inline void parent_scale_position (hb_position_t x, hb_position_t y) {
	x = parent_scale_x_position (x);
	y = parent_scale_y_position (y);
	}


	/* Public getters */

	HB_INTERNAL bool has_func (unsigned int i);

	/* has_* ... */
	#define HB_FONT_FUNC_IMPLEMENT(name) \
	bool \
	has_##name##_func (void) \
	{ \
	hb_font_funcs_t *funcs = this->klass; \
	unsigned int i = offsetof (hb_font_funcs_t::get_t::get_funcs_t, name) / sizeof (funcs->get.array[0]); \
	return has_func (i); \
	}
	HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
	#undef HB_FONT_FUNC_IMPLEMENT

	inline hb_bool_t has_glyph (hb_codepoint_t unicode)
	{
	hb_codepoint_t glyph;
	return get_glyph (unicode, 0, &glyph);
	}

	inline hb_bool_t get_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector,
	hb_codepoint_t *glyph)
	{
	*glyph = 0;
	return klass->get.f.glyph (this, user_data,
	unicode, variation_selector, glyph,
	klass->user_data.glyph);
	}

	inline hb_position_t get_glyph_h_advance (hb_codepoint_t glyph)
	{
	return klass->get.f.glyph_h_advance (this, user_data,
	glyph,
	klass->user_data.glyph_h_advance);
	}

	inline hb_position_t get_glyph_v_advance (hb_codepoint_t glyph)
	{
	return klass->get.f.glyph_v_advance (this, user_data,
	glyph,
	klass->user_data.glyph_v_advance);
	}

	inline hb_bool_t get_glyph_h_origin (hb_codepoint_t glyph,
	hb_position_t x, hb_position_t y)
	{
	x = y = 0;
	return klass->get.f.glyph_h_origin (this, user_data,
	glyph, x, y,
	klass->user_data.glyph_h_origin);
	}

	inline hb_bool_t get_glyph_v_origin (hb_codepoint_t glyph,
	hb_position_t x, hb_position_t y)
	{
	x = y = 0;
	return klass->get.f.glyph_v_origin (this, user_data,
	glyph, x, y,
	klass->user_data.glyph_v_origin);
	}

	inline hb_position_t get_glyph_h_kerning (hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
	{
	return klass->get.f.glyph_h_kerning (this, user_data,
	left_glyph, right_glyph,
	klass->user_data.glyph_h_kerning);
	}

	inline hb_position_t get_glyph_v_kerning (hb_codepoint_t top_glyph, hb_codepoint_t bottom_glyph)
	{
	return klass->get.f.glyph_v_kerning (this, user_data,
	top_glyph, bottom_glyph,
	klass->user_data.glyph_v_kerning);
	}

	inline hb_bool_t get_glyph_extents (hb_codepoint_t glyph,
	hb_glyph_extents_t *extents)
	{
	memset (extents, 0, sizeof (*extents));
	return klass->get.f.glyph_extents (this, user_data,
	glyph,
	extents,
	klass->user_data.glyph_extents);
	}

	inline hb_bool_t get_glyph_contour_point (hb_codepoint_t glyph, unsigned int point_index,
	hb_position_t x, hb_position_t y)
	{
	x = y = 0;
	return klass->get.f.glyph_contour_point (this, user_data,
	glyph, point_index,
	x, y,
	klass->user_data.glyph_contour_point);
	}

	inline hb_bool_t get_glyph_name (hb_codepoint_t glyph,
	char *name, unsigned int size)
	{
	if (size) *name = '\0';
	return klass->get.f.glyph_name (this, user_data,
	glyph,
	name, size,
	klass->user_data.glyph_name);
	}

	inline hb_bool_t get_glyph_from_name (const char name, int len, / -1 means nul-terminated */
	hb_codepoint_t *glyph)
	{
	*glyph = 0;
	if (len == -1) len = strlen (name);
	return klass->get.f.glyph_from_name (this, user_data,
	name, len,
	glyph,
	klass->user_data.glyph_from_name);
	}


	/* A bit higher-level, and with fallback */

	inline void get_glyph_advance_for_direction (hb_codepoint_t glyph,
	hb_direction_t direction,
	hb_position_t x, hb_position_t y)
	{
	if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
	*x = get_glyph_h_advance (glyph);
	*y = 0;
	} else {
	*x = 0;
	*y = get_glyph_v_advance (glyph);
	}
	}

	/* Internal only */
	inline void guess_v_origin_minus_h_origin (hb_codepoint_t glyph,
	hb_position_t x, hb_position_t y)
	{
	*x = get_glyph_h_advance (glyph) / 2;

	/* TODO use font_metrics.ascent */
	*y = y_scale;
	}

	inline void get_glyph_origin_for_direction (hb_codepoint_t glyph,
	hb_direction_t direction,
	hb_position_t x, hb_position_t y)
	{
	if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
	{
	if (!get_glyph_h_origin (glyph, x, y) &&
	get_glyph_v_origin (glyph, x, y))
	{
	hb_position_t dx, dy;
	guess_v_origin_minus_h_origin (glyph, &dx, &dy);
	x -= dx; y -= dy;
	}
	}
	else
	{
	if (!get_glyph_v_origin (glyph, x, y) &&
	get_glyph_h_origin (glyph, x, y))
	{
	hb_position_t dx, dy;
	guess_v_origin_minus_h_origin (glyph, &dx, &dy);
	x += dx; y += dy;
	}
	}
	}

	inline void add_glyph_h_origin (hb_codepoint_t glyph,
	hb_position_t x, hb_position_t y)
	{
	hb_position_t origin_x, origin_y;

	get_glyph_h_origin (glyph, &origin_x, &origin_y);

	*x += origin_x;
	*y += origin_y;
	}
	inline void add_glyph_v_origin (hb_codepoint_t glyph,
	hb_position_t x, hb_position_t y)
	{
	hb_position_t origin_x, origin_y;

	get_glyph_v_origin (glyph, &origin_x, &origin_y);

	*x += origin_x;
	*y += origin_y;
	}
	inline void add_glyph_origin_for_direction (hb_codepoint_t glyph,
	hb_direction_t direction,
	hb_position_t x, hb_position_t y)
	{
	hb_position_t origin_x, origin_y;

	get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y);

	*x += origin_x;
	*y += origin_y;
	}

	inline void subtract_glyph_h_origin (hb_codepoint_t glyph,
	hb_position_t x, hb_position_t y)
	{
	hb_position_t origin_x, origin_y;

	get_glyph_h_origin (glyph, &origin_x, &origin_y);

	*x -= origin_x;
	*y -= origin_y;
	}
	inline void subtract_glyph_v_origin (hb_codepoint_t glyph,
	hb_position_t x, hb_position_t y)
	{
	hb_position_t origin_x, origin_y;

	get_glyph_v_origin (glyph, &origin_x, &origin_y);

	*x -= origin_x;
	*y -= origin_y;
	}
	inline void subtract_glyph_origin_for_direction (hb_codepoint_t glyph,
	hb_direction_t direction,
	hb_position_t x, hb_position_t y)
	{
	hb_position_t origin_x, origin_y;

	get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y);

	*x -= origin_x;
	*y -= origin_y;
	}

	inline void get_glyph_kerning_for_direction (hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
	hb_direction_t direction,
	hb_position_t x, hb_position_t y)
	{
	if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
	*x = get_glyph_h_kerning (first_glyph, second_glyph);
	*y = 0;
	} else {
	*x = 0;
	*y = get_glyph_v_kerning (first_glyph, second_glyph);
	}
	}

	inline hb_bool_t get_glyph_extents_for_origin (hb_codepoint_t glyph,
	hb_direction_t direction,
	hb_glyph_extents_t *extents)
	{
	hb_bool_t ret = get_glyph_extents (glyph, extents);

	if (ret)
	subtract_glyph_origin_for_direction (glyph, direction, &extents->x_bearing, &extents->y_bearing);

	return ret;
	}

	inline hb_bool_t get_glyph_contour_point_for_origin (hb_codepoint_t glyph, unsigned int point_index,
	hb_direction_t direction,
	hb_position_t x, hb_position_t y)
	{
	hb_bool_t ret = get_glyph_contour_point (glyph, point_index, x, y);

	if (ret)
	subtract_glyph_origin_for_direction (glyph, direction, x, y);

	return ret;
	}

	/* Generates gidDDD if glyph has no name. */
	inline void
	glyph_to_string (hb_codepoint_t glyph,
	char *s, unsigned int size)
	{
	if (get_glyph_name (glyph, s, size)) return;

	if (size && snprintf (s, size, "gid%u", glyph) < 0)
	*s = '\0';
	}

	/* Parses gidDDD and uniUUUU strings automatically. */
	inline hb_bool_t
	glyph_from_string (const char s, int len, / -1 means nul-terminated */
	hb_codepoint_t *glyph)
	{
	if (get_glyph_from_name (s, len, glyph)) return true;

	if (len == -1) len = strlen (s);

	/* Straight glyph index. */
	if (hb_codepoint_parse (s, len, 10, glyph))
	return true;

	if (len > 3)
	{
	/* gidDDD syntax for glyph indices. */
	if (0 == strncmp (s, "gid", 3) &&
	hb_codepoint_parse (s + 3, len - 3, 10, glyph))
	return true;

	/* uniUUUU and other Unicode character indices. */
	hb_codepoint_t unichar;
	if (0 == strncmp (s, "uni", 3) &&
	hb_codepoint_parse (s + 3, len - 3, 16, &unichar) &&
	get_glyph (unichar, 0, glyph))
	return true;
	}

	return false;
	}

	private:
	inline hb_position_t em_scale (int16_t v, int scale) { return (hb_position_t) (v * (int64_t) scale / face->get_upem ()); }
	};

	#define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
	#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, font);
	#include "hb-shaper-list.hh"
	#undef HB_SHAPER_IMPLEMENT
	#undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS


	#endif /* HB_FONT_PRIVATE_HH */