tor-browser

hb-font.hh (33559B)

---

/*
* 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_HH
#define HB_FONT_HH

#include "hb.hh"

#include "hb-face.hh"
#include "hb-atomic.hh"
#include "hb-draw.hh"
#include "hb-paint-extents.hh"
#include "hb-shaper.hh"
#include "hb-outline.hh"


/*
* hb_font_funcs_t
*/

#define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
 HB_FONT_FUNC_IMPLEMENT (get_,font_h_extents) \
 HB_FONT_FUNC_IMPLEMENT (get_,font_v_extents) \
 HB_FONT_FUNC_IMPLEMENT (get_,nominal_glyph) \
 HB_FONT_FUNC_IMPLEMENT (get_,nominal_glyphs) \
 HB_FONT_FUNC_IMPLEMENT (get_,variation_glyph) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_h_advance) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_v_advance) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_h_advances) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_v_advances) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_h_origin) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_v_origin) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_h_origins) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_v_origins) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_h_kerning) \
 HB_IF_NOT_DEPRECATED (HB_FONT_FUNC_IMPLEMENT (get_,glyph_v_kerning)) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_extents) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_contour_point) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_name) \
 HB_FONT_FUNC_IMPLEMENT (get_,glyph_from_name) \
 HB_FONT_FUNC_IMPLEMENT (,draw_glyph_or_fail) \
 HB_FONT_FUNC_IMPLEMENT (,paint_glyph_or_fail) \
 /* ^--- Add new callbacks here */

struct hb_font_funcs_t
{
 hb_object_header_t header;

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

 struct {
#define HB_FONT_FUNC_IMPLEMENT(get_,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(get_,name) hb_font_##get_##name##_func_t name;
     HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_FONT_FUNC_IMPLEMENT
   } f;
   void (*array[0
#define HB_FONT_FUNC_IMPLEMENT(get_,name) +1
     HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_FONT_FUNC_IMPLEMENT
	]) ();
 } get;
};
DECLARE_NULL_INSTANCE (hb_font_funcs_t);


/*
* hb_font_t
*/

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

struct hb_font_t
{
 hb_object_header_t header;
 hb_atomic_t<unsigned> serial;
 hb_atomic_t<unsigned> serial_coords;

 hb_font_t *parent;
 hb_face_t *face;

 int32_t x_scale;
 int32_t y_scale;

 bool is_synthetic;

 float x_embolden;
 float y_embolden;
 bool embolden_in_place;
 int32_t x_strength; /* x_embolden, in scaled units. */
 int32_t y_strength; /* y_embolden, in scaled units. */

 float slant;
 float slant_xy;

 float x_multf;
 float y_multf;
 int64_t x_mult;
 int64_t y_mult;

 unsigned int x_ppem;
 unsigned int y_ppem;

 float ptem;

 /* Font variation coordinates. */
 unsigned int instance_index;
 bool has_nonzero_coords;
 unsigned int num_coords;
 int *coords;
 float *design_coords;

 hb_font_funcs_t   *klass;
 void              *user_data;
 hb_destroy_func_t  destroy;

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


 /* Convert from font-space to user-space */
 int64_t dir_mult (hb_direction_t direction)
 { return HB_DIRECTION_IS_VERTICAL(direction) ? y_mult : x_mult; }
 hb_position_t em_scale_x (int16_t v) { return em_mult (v, x_mult); }
 hb_position_t em_scale_y (int16_t v) { return em_mult (v, y_mult); }
 hb_position_t em_scalef_x (float v) { return em_multf (v, x_multf); }
 hb_position_t em_scalef_y (float v) { return em_multf (v, y_multf); }
 float em_fscale_x (int16_t v) { return em_fmult (v, x_multf); }
 float em_fscale_y (int16_t v) { return em_fmult (v, y_multf); }
 float em_fscalef_x (float v) { return em_fmultf (v, x_multf); }
 float em_fscalef_y (float v) { return em_fmultf (v, y_multf); }
 hb_position_t em_scale_dir (int16_t v, hb_direction_t direction)
 { return em_mult (v, dir_mult (direction)); }

 /* Convert from parent-font user-space to our user-space */
 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;
 }
 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;
 }
 hb_position_t parent_scale_x_position (hb_position_t v)
 { return parent_scale_x_distance (v); }
 hb_position_t parent_scale_y_position (hb_position_t v)
 { return parent_scale_y_distance (v); }

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

 void scale_glyph_extents (hb_glyph_extents_t *extents)
 {
   float x1 = em_scale_x (extents->x_bearing);
   float y1 = em_scale_y (extents->y_bearing);
   float x2 = em_scale_x (extents->x_bearing + extents->width);
   float y2 = em_scale_y (extents->y_bearing + extents->height);

   extents->x_bearing = roundf (x1);
   extents->y_bearing = roundf (y1);
   extents->width = roundf (x2) - extents->x_bearing;
   extents->height = roundf (y2) - extents->y_bearing;
 }

 void synthetic_glyph_extents (hb_glyph_extents_t *extents)
 {
   /* Slant. */
   if (slant_xy)
   {
     hb_position_t x1 = extents->x_bearing;
     hb_position_t y1 = extents->y_bearing;
     hb_position_t x2 = extents->x_bearing + extents->width;
     hb_position_t y2 = extents->y_bearing + extents->height;

     x1 += floorf (hb_min (y1 * slant_xy, y2 * slant_xy));
     x2 += ceilf (hb_max (y1 * slant_xy, y2 * slant_xy));

     extents->x_bearing = x1;
     extents->width = x2 - extents->x_bearing;
   }

   /* Embolden. */
   if (x_strength || y_strength)
   {
     /* Y */
     int y_shift = y_strength;
     if (y_scale < 0) y_shift = -y_shift;
     extents->y_bearing += y_shift;
     extents->height -= y_shift;

     /* X */
     int x_shift = x_strength;
     if (x_scale < 0) x_shift = -x_shift;
     if (embolden_in_place)
extents->x_bearing -= x_shift / 2;
     extents->width += x_shift;
   }
 }


 /* Public getters */

 HB_INTERNAL bool has_func (unsigned int i);
 HB_INTERNAL bool has_func_set (unsigned int i);

 /* has_* ... */
#define HB_FONT_FUNC_IMPLEMENT(get_,name) \
 bool \
 has_##name##_func () \
 { \
   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); \
 } \
 bool \
 has_##name##_func_set () \
 { \
   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_set (i); \
 }
 HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_FONT_FUNC_IMPLEMENT

 hb_bool_t get_font_h_extents (hb_font_extents_t *extents,
			bool synthetic = true)
 {
   hb_memset (extents, 0, sizeof (*extents));
   bool ret = klass->get.f.font_h_extents (this, user_data,
				    extents,
				    !klass->user_data ? nullptr : klass->user_data->font_h_extents);

   if (synthetic && ret)
   {
     /* Embolden */
     int y_shift = y_scale < 0 ? -y_strength : y_strength;
     extents->ascender += y_shift;
   }

   return ret;
 }
 hb_bool_t get_font_v_extents (hb_font_extents_t *extents,
			bool synthetic = true)
 {
   hb_memset (extents, 0, sizeof (*extents));
   bool ret = klass->get.f.font_v_extents (this, user_data,
				    extents,
				    !klass->user_data ? nullptr : klass->user_data->font_v_extents);

   if (synthetic && ret)
   {
     /* Embolden */
     int x_shift = x_scale < 0 ? -x_strength : x_strength;
     if (embolden_in_place)
     {
extents->ascender += x_shift / 2;
extents->descender -= x_shift - x_shift / 2;
     }
     else
extents->ascender += x_shift;
   }

   return ret;
 }

 bool has_glyph (hb_codepoint_t unicode)
 {
   hb_codepoint_t glyph;
   return get_nominal_glyph (unicode, &glyph);
 }

 hb_bool_t get_nominal_glyph (hb_codepoint_t unicode,
		       hb_codepoint_t *glyph,
		       hb_codepoint_t not_found = 0)
 {
   *glyph = not_found;
   return klass->get.f.nominal_glyph (this, user_data,
			       unicode, glyph,
			       !klass->user_data ? nullptr : klass->user_data->nominal_glyph);
 }
 unsigned int get_nominal_glyphs (unsigned int count,
			   const hb_codepoint_t *first_unicode,
			   unsigned int unicode_stride,
			   hb_codepoint_t *first_glyph,
			   unsigned int glyph_stride)
 {
   return klass->get.f.nominal_glyphs (this, user_data,
				count,
				first_unicode, unicode_stride,
				first_glyph, glyph_stride,
				!klass->user_data ? nullptr : klass->user_data->nominal_glyphs);
 }

 hb_bool_t get_variation_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector,
			 hb_codepoint_t *glyph,
			 hb_codepoint_t not_found = 0)
 {
   *glyph = not_found;
   return klass->get.f.variation_glyph (this, user_data,
				 unicode, variation_selector, glyph,
				 !klass->user_data ? nullptr : klass->user_data->variation_glyph);
 }

 hb_position_t get_glyph_h_advance (hb_codepoint_t glyph,
			     bool synthetic = true)
 {
   hb_position_t advance = klass->get.f.glyph_h_advance (this, user_data,
						  glyph,
						  !klass->user_data ? nullptr : klass->user_data->glyph_h_advance);

   if (synthetic && x_strength && !embolden_in_place)
   {
     /* Embolden */
     hb_position_t strength = x_scale >= 0 ? x_strength : -x_strength;
     advance += advance ? strength : 0;
   }

   return advance;
 }

 hb_position_t get_glyph_v_advance (hb_codepoint_t glyph,
			     bool synthetic = true)
 {
   hb_position_t advance = klass->get.f.glyph_v_advance (this, user_data,
						  glyph,
						  !klass->user_data ? nullptr : klass->user_data->glyph_v_advance);

   if (synthetic && y_strength && !embolden_in_place)
   {
     /* Embolden */
     hb_position_t strength = y_scale >= 0 ? y_strength : -y_strength;
     advance += advance ? strength : 0;
   }

   return advance;
 }

 void get_glyph_h_advances (unsigned int count,
		     const hb_codepoint_t *first_glyph,
		     unsigned int glyph_stride,
		     hb_position_t *first_advance,
		     unsigned int advance_stride,
		     bool synthetic = true)
 {
   klass->get.f.glyph_h_advances (this, user_data,
			   count,
			   first_glyph, glyph_stride,
			   first_advance, advance_stride,
			   !klass->user_data ? nullptr : klass->user_data->glyph_h_advances);

   if (synthetic && x_strength && !embolden_in_place)
   {
     /* Embolden */
     hb_position_t strength = x_scale >= 0 ? x_strength : -x_strength;
     for (unsigned int i = 0; i < count; i++)
     {
*first_advance += *first_advance ? strength : 0;
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
     }
   }
 }

 void get_glyph_v_advances (unsigned int count,
		     const hb_codepoint_t *first_glyph,
		     unsigned int glyph_stride,
		     hb_position_t *first_advance,
		     unsigned int advance_stride,
		     bool synthetic = true)
 {
   klass->get.f.glyph_v_advances (this, user_data,
			   count,
			   first_glyph, glyph_stride,
			   first_advance, advance_stride,
			   !klass->user_data ? nullptr : klass->user_data->glyph_v_advances);

   if (synthetic && y_strength && !embolden_in_place)
   {
     /* Embolden */
     hb_position_t strength = y_scale >= 0 ? y_strength : -y_strength;
     for (unsigned int i = 0; i < count; i++)
     {
*first_advance += *first_advance ? strength : 0;
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
     }
   }
 }

 hb_bool_t get_glyph_h_origin (hb_codepoint_t glyph,
			hb_position_t *x, hb_position_t *y,
			bool synthetic = true)
 {
   *x = *y = 0;
   bool ret = klass->get.f.glyph_h_origin (this, user_data,
				    glyph, x, y,
				    !klass->user_data ? nullptr : klass->user_data->glyph_h_origin);

   if (synthetic && ret)
   {
     /* Slant is ignored as it does not affect glyph origin */

     /* Embolden */
     if (!embolden_in_place)
     {
       *x += x_scale < 0 ? -x_strength : x_strength;
*y += y_scale < 0 ? -y_strength : y_strength;
     }
   }

   return ret;
 }

 hb_bool_t get_glyph_v_origin (hb_codepoint_t glyph,
			hb_position_t *x, hb_position_t *y,
			bool synthetic = true)
 {
   *x = *y = 0;
   bool ret = klass->get.f.glyph_v_origin (this, user_data,
				    glyph, x, y,
				    !klass->user_data ? nullptr : klass->user_data->glyph_v_origin);

   if (synthetic && ret)
   {
     /* Slant is ignored as it does not affect glyph origin */

     /* Embolden */
     if (!embolden_in_place)
     {
       *x += x_scale < 0 ? -x_strength : x_strength;
*y += y_scale < 0 ? -y_strength : y_strength;
     }
   }

   return ret;
 }

 hb_bool_t get_glyph_h_origins (unsigned int count,
			 const hb_codepoint_t *first_glyph,
			 unsigned int glyph_stride,
			 hb_position_t *first_x,
			 unsigned int x_stride,
			 hb_position_t *first_y,
			 unsigned int y_stride,
			 bool synthetic = true)

 {
   bool ret = klass->get.f.glyph_h_origins (this, user_data,
				     count,
				     first_glyph, glyph_stride,
				     first_x, x_stride, first_y, y_stride,
				     !klass->user_data ? nullptr : klass->user_data->glyph_h_origins);

   if (synthetic && ret)
   {
     hb_position_t x_shift = x_scale < 0 ? -x_strength : x_strength;
     hb_position_t y_shift = y_scale < 0 ? -y_strength : y_strength;
     for (unsigned i = 0; i < count; i++)
     {
/* Slant is ignored as it does not affect glyph origin */

/* Embolden */
if (!embolden_in_place)
{
  *first_x += x_shift;
  *first_y += y_shift;
}
first_x = &StructAtOffsetUnaligned<hb_position_t> (first_x, x_stride);
first_y = &StructAtOffsetUnaligned<hb_position_t> (first_y, y_stride);
     }
   }

   return ret;
 }

 hb_bool_t get_glyph_v_origins (unsigned int count,
			 const hb_codepoint_t *first_glyph,
			 unsigned int glyph_stride,
			 hb_position_t *first_x,
			 unsigned int x_stride,
			 hb_position_t *first_y,
			 unsigned int y_stride,
			 bool synthetic = true)

 {
   bool ret = klass->get.f.glyph_v_origins (this, user_data,
				     count,
				     first_glyph, glyph_stride,
				     first_x, x_stride, first_y, y_stride,
				     !klass->user_data ? nullptr : klass->user_data->glyph_v_origins);

   if (synthetic && is_synthetic && ret)
   {
     hb_position_t x_shift = x_scale < 0 ? -x_strength : x_strength;
     hb_position_t y_shift = y_scale < 0 ? -y_strength : y_strength;
     for (unsigned i = 0; i < count; i++)
     {
/* Slant is ignored as it does not affect glyph origin */

/* Embolden */
if (!embolden_in_place)
{
  *first_x += x_shift;
  *first_y += y_shift;
}
first_x = &StructAtOffsetUnaligned<hb_position_t> (first_x, x_stride);
first_y = &StructAtOffsetUnaligned<hb_position_t> (first_y, y_stride);
     }
   }

   return ret;
 }

 hb_position_t get_glyph_h_kerning (hb_codepoint_t left_glyph,
			     hb_codepoint_t right_glyph)
 {
#ifdef HB_DISABLE_DEPRECATED
   return 0;
#else
   return klass->get.f.glyph_h_kerning (this, user_data,
				 left_glyph, right_glyph,
				 !klass->user_data ? nullptr : klass->user_data->glyph_h_kerning);
#endif
 }

 hb_position_t get_glyph_v_kerning (hb_codepoint_t top_glyph,
			     hb_codepoint_t bottom_glyph)
 {
#ifdef HB_DISABLE_DEPRECATED
   return 0;
#else
   return klass->get.f.glyph_v_kerning (this, user_data,
				 top_glyph, bottom_glyph,
				 !klass->user_data ? nullptr : klass->user_data->glyph_v_kerning);
#endif
 }

 hb_bool_t get_glyph_extents (hb_codepoint_t glyph,
		       hb_glyph_extents_t *extents,
		       bool synthetic = true)
 {
   hb_memset (extents, 0, sizeof (*extents));

   /* This is rather messy, but necessary. */

   if (!synthetic)
   {
     return klass->get.f.glyph_extents (this, user_data,
				 glyph,
				 extents,
				 !klass->user_data ? nullptr : klass->user_data->glyph_extents);
   }
   if (!is_synthetic &&
klass->get.f.glyph_extents (this, user_data,
			    glyph,
			    extents,
			    !klass->user_data ? nullptr : klass->user_data->glyph_extents))
     return true;

   /* Try getting extents from paint(), then draw(), *then* get_extents()
    * and apply synthetic settings in the last case. */

#ifndef HB_NO_PAINT
   hb_paint_extents_context_t paint_extents;
   if (paint_glyph_or_fail (glyph,
		     hb_paint_extents_get_funcs (), &paint_extents,
		     0, 0))
   {
     *extents = paint_extents.get_extents ().to_glyph_extents ();
     return true;
   }
#endif

#ifndef HB_NO_DRAW
   hb_extents_t<> draw_extents;
   if (draw_glyph_or_fail (glyph,
		    hb_draw_extents_get_funcs (), &draw_extents))
   {
     *extents = draw_extents.to_glyph_extents ();
     return true;
   }
#endif

   bool ret = klass->get.f.glyph_extents (this, user_data,
				   glyph,
				   extents,
				   !klass->user_data ? nullptr : klass->user_data->glyph_extents);
   if (ret)
     synthetic_glyph_extents (extents);

   return ret;
 }

 hb_bool_t get_glyph_contour_point (hb_codepoint_t glyph, unsigned int point_index,
			     hb_position_t *x, hb_position_t *y,
			     bool synthetic = true)
 {
   *x = *y = 0;
   bool ret = klass->get.f.glyph_contour_point (this, user_data,
					 glyph, point_index,
					 x, y,
					 !klass->user_data ? nullptr : klass->user_data->glyph_contour_point);

   if (synthetic && ret)
   {
     /* Slant */
     if (slant_xy)
       *x += roundf (*y * slant_xy);

     /* Embolden */
     if (!embolden_in_place)
     {
int x_shift = x_scale < 0 ? -x_strength : x_strength;
*x += x_shift;
     }
   }

   return ret;
 }

 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 ? nullptr : klass->user_data->glyph_name);
 }

 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 ? nullptr : klass->user_data->glyph_from_name);
 }

 bool draw_glyph_or_fail (hb_codepoint_t glyph,
		   hb_draw_funcs_t *draw_funcs, void *draw_data,
		   bool synthetic = true)
 {
#ifndef HB_NO_DRAW
#ifndef HB_NO_OUTLINE
   bool embolden = x_strength || y_strength;
   bool slanted = slant_xy;
   synthetic = synthetic && (embolden || slanted);
#else
   synthetic = false;
#endif

   if (!synthetic)
   {
     return klass->get.f.draw_glyph_or_fail (this, user_data,
				      glyph,
				      draw_funcs, draw_data,
				      !klass->user_data ? nullptr : klass->user_data->draw_glyph_or_fail);
   }

#ifndef HB_NO_OUTLINE

   hb_outline_t outline;
   if (!klass->get.f.draw_glyph_or_fail (this, user_data,
				  glyph,
				  hb_outline_recording_pen_get_funcs (), &outline,
				  !klass->user_data ? nullptr : klass->user_data->draw_glyph_or_fail))
     return false;

   // Slant before embolden; produces nicer results.

   if (slanted)
   {
     hb_position_t xo = 0, yo = 0;
     get_glyph_h_origin (glyph, &xo, &yo, false);
     outline.translate (-xo, -yo);
     outline.slant (slant_xy);
     outline.translate (xo, yo);
   }

   if (embolden)
   {
     float x_shift = embolden_in_place ? 0 : (float) x_strength / 2;
     float y_shift = (float) y_strength / 2;
     if (x_scale < 0) x_shift = -x_shift;
     if (y_scale < 0) y_shift = -y_shift;
     outline.embolden (x_strength, y_strength, x_shift, y_shift);
   }

   outline.replay (draw_funcs, draw_data);

   return true;
#endif
#endif
   return false;
 }

 bool paint_glyph_or_fail (hb_codepoint_t glyph,
		    hb_paint_funcs_t *paint_funcs, void *paint_data,
		    unsigned int palette,
		    hb_color_t foreground,
		    bool synthetic = true)
 {
#ifndef HB_NO_PAINT
   /* Slant */
   if (synthetic && slant_xy)
     hb_paint_push_transform (paint_funcs, paint_data,
		       1.f, 0.f,
		       slant_xy, 1.f,
		       0.f, 0.f);

   bool ret = klass->get.f.paint_glyph_or_fail (this, user_data,
					 glyph,
					 paint_funcs, paint_data,
					 palette, foreground,
					 !klass->user_data ? nullptr : klass->user_data->paint_glyph_or_fail);

   if (synthetic && slant_xy)
     hb_paint_pop_transform (paint_funcs, paint_data);

   return ret;
#endif
   return false;
 }

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

 HB_INTERNAL
 void paint_glyph (hb_codepoint_t glyph,
	    hb_paint_funcs_t *paint_funcs, void *paint_data,
	    unsigned int palette,
	    hb_color_t foreground);

 void get_h_extents_with_fallback (hb_font_extents_t *extents)
 {
   if (!get_font_h_extents (extents))
   {
     extents->ascender = y_scale * .8;
     extents->descender = extents->ascender - y_scale;
     extents->line_gap = 0;
   }
 }
 void get_v_extents_with_fallback (hb_font_extents_t *extents)
 {
   if (!get_font_v_extents (extents))
   {
     extents->ascender = x_scale / 2;
     extents->descender = extents->ascender - x_scale;
     extents->line_gap = 0;
   }
 }

 void get_extents_for_direction (hb_direction_t direction,
			  hb_font_extents_t *extents)
 {
   if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
     get_h_extents_with_fallback (extents);
   else
     get_v_extents_with_fallback (extents);
 }

 void get_glyph_advance_for_direction (hb_codepoint_t glyph,
				hb_direction_t direction,
				hb_position_t *x, hb_position_t *y)
 {
   *x = *y = 0;
   if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
     *x = get_glyph_h_advance (glyph);
   else
     *y = get_glyph_v_advance (glyph);
 }
 void get_glyph_advances_for_direction (hb_direction_t direction,
				 unsigned int count,
				 const hb_codepoint_t *first_glyph,
				 unsigned glyph_stride,
				 hb_position_t *first_advance,
				 unsigned advance_stride)
 {
   if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
     get_glyph_h_advances (count, first_glyph, glyph_stride, first_advance, advance_stride);
   else
     get_glyph_v_advances (count, first_glyph, glyph_stride, first_advance, advance_stride);
 }

 void apply_offset (hb_position_t *x, hb_position_t *y,
	     hb_position_t dx, hb_position_t dy,
	     signed mult)
 {
   assert (mult == -1 || mult == +1);

   *x += dx * mult;
   *y += dy * mult;
 }
 void add_offset (hb_position_t *x, hb_position_t *y,
	   hb_position_t dx, hb_position_t dy)
 {
   *x += dx;
   *y += dy;
 }
 void subtract_offset (hb_position_t *x, hb_position_t *y,
		hb_position_t dx, hb_position_t dy)
 {
   *x -= dx;
   *y -= dy;
 }

 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;

   hb_font_extents_t extents;
   get_h_extents_with_fallback (&extents);
   *y = extents.ascender;
 }

 void apply_glyph_h_origins_with_fallback (hb_buffer_t *buf, int mult)
 {
   bool has_ascender = false;
   hb_position_t ascender = 0;

   struct { hb_position_t x, y; } origins[32];

   unsigned int offset = 0;
   unsigned int count = buf->len;
   while (offset < count)
   {
     unsigned n = hb_min (count - offset, ARRAY_LENGTH (origins));
     if (!get_glyph_h_origins (n,
			&buf->info[offset].codepoint, sizeof (hb_glyph_info_t),
			&origins[0].x, sizeof (origins[0]),
			&origins[0].y, sizeof (origins[0])))
     {
       if (get_glyph_v_origins (n,
			  &buf->info[offset].codepoint, sizeof (hb_glyph_info_t),
			  &origins[0].x, sizeof (origins[0]),
			  &origins[0].y, sizeof (origins[0])))
{
  if (!has_ascender)
  {
    hb_font_extents_t extents;
    get_h_extents_with_fallback (&extents);
    ascender = extents.ascender;
    has_ascender = true;
  }

  /* We got the v_origins, adjust them to h_origins. */
  for (unsigned j = 0; j < n; j++)
  {
    hb_codepoint_t glyph = buf->info[offset + j].codepoint;
    origins[j].x -= get_glyph_h_advance (glyph) / 2;
    origins[j].y -= ascender;
  }
}
else
{
  for (unsigned j = 0; j < n; j++)
  {
    origins[j].x = 0;
    origins[j].y = 0;
  }
}
     }

     assert (mult == -1 || mult == +1);
     if (mult == +1)
       for (unsigned j = 0; j < n; j++)
{
  hb_glyph_position_t *pos = &buf->pos[offset + j];
  add_offset (&pos->x_offset, &pos->y_offset,
	      origins[j].x, origins[j].y);
}
     else /* mult == -1 */
for (unsigned j = 0; j < n; j++)
{
  hb_glyph_position_t *pos = &buf->pos[offset + j];
  subtract_offset (&pos->x_offset, &pos->y_offset,
		   origins[j].x, origins[j].y);
}

     offset += n;
   }
 }
 void apply_glyph_v_origins_with_fallback (hb_buffer_t *buf, int mult)
 {
   bool has_ascender = false;
   hb_position_t ascender = 0;

   struct { hb_position_t x, y; } origins[32];

   unsigned int offset = 0;
   unsigned int count = buf->len;
   while (offset < count)
   {
     unsigned n = hb_min (count - offset, ARRAY_LENGTH (origins));
     if (!get_glyph_v_origins (n,
			&buf->info[offset].codepoint, sizeof (hb_glyph_info_t),
			&origins[0].x, sizeof (origins[0]),
			&origins[0].y, sizeof (origins[0])))
     {
if (get_glyph_h_origins (n,
			 &buf->info[offset].codepoint, sizeof (hb_glyph_info_t),
			 &origins[0].x, sizeof (origins[0]),
			 &origins[0].y, sizeof (origins[0])))
{
  if (!has_ascender)
  {
    hb_font_extents_t extents;
    get_h_extents_with_fallback (&extents);
    ascender = extents.ascender;
    has_ascender = true;
  }

  /* We got the h_origins, adjust them to v_origins. */
  for (unsigned j = 0; j < n; j++)
  {
    hb_codepoint_t glyph = buf->info[offset + j].codepoint;
    origins[j].x += get_glyph_h_advance (glyph) / 2;
    origins[j].y += ascender;
  }
}
else
{
  for (unsigned j = 0; j < n; j++)
  {
    origins[j].x = 0;
    origins[j].y = 0;
  }
}
     }

     assert (mult == -1 || mult == +1);
     if (mult == +1)
       for (unsigned j = 0; j < n; j++)
{
  hb_glyph_position_t *pos = &buf->pos[offset + j];
  add_offset (&pos->x_offset, &pos->y_offset,
	      origins[j].x, origins[j].y);
}
     else /* mult == -1 */
for (unsigned j = 0; j < n; j++)
{
  hb_glyph_position_t *pos = &buf->pos[offset + j];
  subtract_offset (&pos->x_offset, &pos->y_offset,
		   origins[j].x, origins[j].y);
}

     offset += n;
   }
 }

 void get_glyph_h_origin_with_fallback (hb_codepoint_t glyph,
				 hb_position_t *x, hb_position_t *y)
 {
   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);
     subtract_offset (x, y, dx, dy);
   }
 }
 void get_glyph_v_origin_with_fallback (hb_codepoint_t glyph,
				 hb_position_t *x, hb_position_t *y)
 {
   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);
     add_offset (x, y, dx, dy);
   }
 }

 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)))
     get_glyph_h_origin_with_fallback (glyph, x, y);
   else
     get_glyph_v_origin_with_fallback (glyph, x, y);
 }

 void add_glyph_h_origins (hb_buffer_t *buf)
 {
   apply_glyph_h_origins_with_fallback (buf, +1);
 }
 void add_glyph_v_origins (hb_buffer_t *buf)
 {
   apply_glyph_v_origins_with_fallback (buf, +1);
 }
 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);
   add_offset (x, y, origin_x, origin_y);
 }

 void subtract_glyph_h_origins (hb_buffer_t *buf)
 {
   apply_glyph_h_origins_with_fallback (buf, -1);
 }
 void subtract_glyph_v_origins (hb_buffer_t *buf)
 {
   apply_glyph_v_origins_with_fallback (buf, -1);
 }
 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);
   subtract_offset (x, y, origin_x, origin_y);
 }

 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))) {
     *y = 0;
     *x = get_glyph_h_kerning (first_glyph, second_glyph);
   } else {
     *x = 0;
     *y = get_glyph_v_kerning (first_glyph, second_glyph);
   }
 }

 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;
 }

 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. */
 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%" PRIu32, glyph) < 0)
     *s = '\0';
 }

 /* Parses gidDDD and uniUUUU strings automatically. */
 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_nominal_glyph (unichar, glyph))
return true;
   }

   return false;
 }

 void changed ()
 {
   float upem = face->get_upem ();

   x_multf = x_scale / upem;
   y_multf = y_scale / upem;
   bool x_neg = x_scale < 0;
   x_mult = (x_neg ? -((int64_t) -x_scale << 16) : ((int64_t) x_scale << 16)) / upem;
   bool y_neg = y_scale < 0;
   y_mult = (y_neg ? -((int64_t) -y_scale << 16) : ((int64_t) y_scale << 16)) / upem;

   is_synthetic =  x_embolden || y_embolden || slant;

   x_strength = roundf (abs (x_scale) * x_embolden);
   y_strength = roundf (abs (y_scale) * y_embolden);

   slant_xy = y_scale ? slant * x_scale / y_scale : 0.f;

   data.fini ();

   serial++;
 }

 hb_position_t em_mult (int16_t v, int64_t mult)
 { return (hb_position_t) ((v * mult + 32768) >> 16); }
 hb_position_t em_multf (float v, float mult)
 { return (hb_position_t) roundf (em_fmultf (v, mult)); }
 float em_fmultf (float v, float mult)
 { return v * mult; }
 float em_fmult (int16_t v, float mult)
 { return (float) v * mult; }
};
DECLARE_NULL_INSTANCE (hb_font_t);


#endif /* HB_FONT_HH */