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virtualx-engine/thirdparty/harfbuzz/src/hb-ot-font.cc
bruvzg b64df2bf74
Update HarfBuzz, ICU and FreeType 
HarfBuzz: Update to version 7.3.0
ICU4C: Update to version 73.1
FreeType: Update to version 2.13.0
2023-05-23 03:26:16 +03:00

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/*
* Copyright © 2011,2014 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.
*
* Google Author(s): Behdad Esfahbod, Roozbeh Pournader
*/
#include "hb.hh"
#ifndef HB_NO_OT_FONT
#include "hb-ot.h"
#include "hb-cache.hh"
#include "hb-font.hh"
#include "hb-machinery.hh"
#include "hb-ot-face.hh"
#include "hb-outline.hh"
#include "hb-ot-cmap-table.hh"
#include "hb-ot-glyf-table.hh"
#include "hb-ot-cff1-table.hh"
#include "hb-ot-cff2-table.hh"
#include "hb-ot-hmtx-table.hh"
#include "hb-ot-post-table.hh"
#include "hb-ot-stat-table.hh" // Just so we compile it; unused otherwise.
#include "hb-ot-vorg-table.hh"
#include "OT/Color/CBDT/CBDT.hh"
#include "OT/Color/COLR/COLR.hh"
#include "OT/Color/sbix/sbix.hh"
#include "OT/Color/svg/svg.hh"
/**
* SECTION:hb-ot-font
* @title: hb-ot-font
* @short_description: OpenType font implementation
* @include: hb-ot.h
*
* Functions for using OpenType fonts with hb_shape(). Note that fonts returned
* by hb_font_create() default to using these functions, so most clients would
* never need to call these functions directly.
**/
using hb_ot_font_cmap_cache_t = hb_cache_t<21, 16, 8, true>;
using hb_ot_font_advance_cache_t = hb_cache_t<24, 16, 8, true>;
#ifndef HB_NO_OT_FONT_CMAP_CACHE
static hb_user_data_key_t hb_ot_font_cmap_cache_user_data_key;
#endif
struct hb_ot_font_t
{
const hb_ot_face_t *ot_face;
#ifndef HB_NO_OT_FONT_CMAP_CACHE
hb_ot_font_cmap_cache_t *cmap_cache;
#endif
/* h_advance caching */
mutable hb_atomic_int_t cached_coords_serial;
mutable hb_atomic_ptr_t<hb_ot_font_advance_cache_t> advance_cache;
};
static hb_ot_font_t *
_hb_ot_font_create (hb_font_t *font)
{
hb_ot_font_t *ot_font = (hb_ot_font_t *) hb_calloc (1, sizeof (hb_ot_font_t));
if (unlikely (!ot_font))
return nullptr;
ot_font->ot_face = &font->face->table;
#ifndef HB_NO_OT_FONT_CMAP_CACHE
// retry:
auto *cmap_cache = (hb_ot_font_cmap_cache_t *) hb_face_get_user_data (font->face,
&hb_ot_font_cmap_cache_user_data_key);
if (!cmap_cache)
{
cmap_cache = (hb_ot_font_cmap_cache_t *) hb_malloc (sizeof (hb_ot_font_cmap_cache_t));
if (unlikely (!cmap_cache)) goto out;
cmap_cache->init ();
if (unlikely (!hb_face_set_user_data (font->face,
&hb_ot_font_cmap_cache_user_data_key,
cmap_cache,
hb_free,
false)))
{
hb_free (cmap_cache);
cmap_cache = nullptr;
/* Normally we would retry here, but that would
* infinite-loop if the face is the empty-face.
* Just let it go and this font will be uncached if it
* happened to collide with another thread creating the
* cache at the same time. */
// goto retry;
}
}
out:
ot_font->cmap_cache = cmap_cache;
#endif
return ot_font;
}
static void
_hb_ot_font_destroy (void *font_data)
{
hb_ot_font_t *ot_font = (hb_ot_font_t *) font_data;
auto *cache = ot_font->advance_cache.get_relaxed ();
hb_free (cache);
hb_free (ot_font);
}
static hb_bool_t
hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
void *font_data,
hb_codepoint_t unicode,
hb_codepoint_t *glyph,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
const hb_ot_face_t *ot_face = ot_font->ot_face;
hb_ot_font_cmap_cache_t *cmap_cache = nullptr;
#ifndef HB_NO_OT_FONT_CMAP_CACHE
cmap_cache = ot_font->cmap_cache;
#endif
return ot_face->cmap->get_nominal_glyph (unicode, glyph, cmap_cache);
}
static unsigned int
hb_ot_get_nominal_glyphs (hb_font_t *font HB_UNUSED,
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 HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
const hb_ot_face_t *ot_face = ot_font->ot_face;
hb_ot_font_cmap_cache_t *cmap_cache = nullptr;
#ifndef HB_NO_OT_FONT_CMAP_CACHE
cmap_cache = ot_font->cmap_cache;
#endif
return ot_face->cmap->get_nominal_glyphs (count,
first_unicode, unicode_stride,
first_glyph, glyph_stride,
cmap_cache);
}
static hb_bool_t
hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
void *font_data,
hb_codepoint_t unicode,
hb_codepoint_t variation_selector,
hb_codepoint_t *glyph,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
const hb_ot_face_t *ot_face = ot_font->ot_face;
hb_ot_font_cmap_cache_t *cmap_cache = nullptr;
#ifndef HB_NO_OT_FONT_CMAP_CACHE
cmap_cache = ot_font->cmap_cache;
#endif
return ot_face->cmap->get_variation_glyph (unicode,
variation_selector, glyph,
cmap_cache);
}
static void
hb_ot_get_glyph_h_advances (hb_font_t* font, void* font_data,
unsigned count,
const hb_codepoint_t *first_glyph,
unsigned glyph_stride,
hb_position_t *first_advance,
unsigned advance_stride,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
const hb_ot_face_t *ot_face = ot_font->ot_face;
const OT::hmtx_accelerator_t &hmtx = *ot_face->hmtx;
hb_position_t *orig_first_advance = first_advance;
#if !defined(HB_NO_VAR) && !defined(HB_NO_OT_FONT_ADVANCE_CACHE)
const OT::HVAR &HVAR = *hmtx.var_table;
const OT::VariationStore &varStore = &HVAR + HVAR.varStore;
OT::VariationStore::cache_t *varStore_cache = font->num_coords * count >= 128 ? varStore.create_cache () : nullptr;
bool use_cache = font->num_coords;
#else
OT::VariationStore::cache_t *varStore_cache = nullptr;
bool use_cache = false;
#endif
hb_ot_font_advance_cache_t *cache = nullptr;
if (use_cache)
{
retry:
cache = ot_font->advance_cache.get_acquire ();
if (unlikely (!cache))
{
cache = (hb_ot_font_advance_cache_t *) hb_malloc (sizeof (hb_ot_font_advance_cache_t));
if (unlikely (!cache))
{
use_cache = false;
goto out;
}
cache->init ();
if (unlikely (!ot_font->advance_cache.cmpexch (nullptr, cache)))
{
hb_free (cache);
goto retry;
}
ot_font->cached_coords_serial.set_release (font->serial_coords);
}
}
out:
if (!use_cache)
{
for (unsigned int i = 0; i < count; i++)
{
*first_advance = font->em_scale_x (hmtx.get_advance_with_var_unscaled (*first_glyph, font, varStore_cache));
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
else
{ /* Use cache. */
if (ot_font->cached_coords_serial.get_acquire () != (int) font->serial_coords)
{
ot_font->advance_cache->init ();
ot_font->cached_coords_serial.set_release (font->serial_coords);
}
for (unsigned int i = 0; i < count; i++)
{
hb_position_t v;
unsigned cv;
if (ot_font->advance_cache->get (*first_glyph, &cv))
v = cv;
else
{
v = hmtx.get_advance_with_var_unscaled (*first_glyph, font, varStore_cache);
ot_font->advance_cache->set (*first_glyph, v);
}
*first_advance = font->em_scale_x (v);
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
#if !defined(HB_NO_VAR) && !defined(HB_NO_OT_FONT_ADVANCE_CACHE)
OT::VariationStore::destroy_cache (varStore_cache);
#endif
if (font->x_strength && !font->embolden_in_place)
{
/* Emboldening. */
hb_position_t x_strength = font->x_scale >= 0 ? font->x_strength : -font->x_strength;
first_advance = orig_first_advance;
for (unsigned int i = 0; i < count; i++)
{
*first_advance += *first_advance ? x_strength : 0;
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
}
#ifndef HB_NO_VERTICAL
static void
hb_ot_get_glyph_v_advances (hb_font_t* font, void* font_data,
unsigned count,
const hb_codepoint_t *first_glyph,
unsigned glyph_stride,
hb_position_t *first_advance,
unsigned advance_stride,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
const hb_ot_face_t *ot_face = ot_font->ot_face;
const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
hb_position_t *orig_first_advance = first_advance;
if (vmtx.has_data ())
{
#if !defined(HB_NO_VAR) && !defined(HB_NO_OT_FONT_ADVANCE_CACHE)
const OT::VVAR &VVAR = *vmtx.var_table;
const OT::VariationStore &varStore = &VVAR + VVAR.varStore;
OT::VariationStore::cache_t *varStore_cache = font->num_coords ? varStore.create_cache () : nullptr;
#else
OT::VariationStore::cache_t *varStore_cache = nullptr;
#endif
for (unsigned int i = 0; i < count; i++)
{
*first_advance = font->em_scale_y (-(int) vmtx.get_advance_with_var_unscaled (*first_glyph, font, varStore_cache));
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
#if !defined(HB_NO_VAR) && !defined(HB_NO_OT_FONT_ADVANCE_CACHE)
OT::VariationStore::destroy_cache (varStore_cache);
#endif
}
else
{
hb_font_extents_t font_extents;
font->get_h_extents_with_fallback (&font_extents);
hb_position_t advance = -(font_extents.ascender - font_extents.descender);
for (unsigned int i = 0; i < count; i++)
{
*first_advance = advance;
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
if (font->y_strength && !font->embolden_in_place)
{
/* Emboldening. */
hb_position_t y_strength = font->y_scale >= 0 ? font->y_strength : -font->y_strength;
first_advance = orig_first_advance;
for (unsigned int i = 0; i < count; i++)
{
*first_advance += *first_advance ? y_strength : 0;
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
}
#endif
#ifndef HB_NO_VERTICAL
static hb_bool_t
hb_ot_get_glyph_v_origin (hb_font_t *font,
void *font_data,
hb_codepoint_t glyph,
hb_position_t *x,
hb_position_t *y,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
const hb_ot_face_t *ot_face = ot_font->ot_face;
*x = font->get_glyph_h_advance (glyph) / 2;
const OT::VORG &VORG = *ot_face->VORG;
if (VORG.has_data ())
{
float delta = 0;
#ifndef HB_NO_VAR
const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
const OT::VVAR &VVAR = *vmtx.var_table;
if (font->num_coords)
VVAR.get_vorg_delta_unscaled (glyph,
font->coords, font->num_coords,
&delta);
#endif
*y = font->em_scalef_y (VORG.get_y_origin (glyph) + delta);
return true;
}
hb_glyph_extents_t extents = {0};
if (ot_face->glyf->get_extents (font, glyph, &extents))
{
const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
int tsb = 0;
if (vmtx.get_leading_bearing_with_var_unscaled (font, glyph, &tsb))
{
*y = extents.y_bearing + font->em_scale_y (tsb);
return true;
}
hb_font_extents_t font_extents;
font->get_h_extents_with_fallback (&font_extents);
hb_position_t advance = font_extents.ascender - font_extents.descender;
int diff = advance - -extents.height;
*y = extents.y_bearing + (diff >> 1);
return true;
}
hb_font_extents_t font_extents;
font->get_h_extents_with_fallback (&font_extents);
*y = font_extents.ascender;
return true;
}
#endif
static hb_bool_t
hb_ot_get_glyph_extents (hb_font_t *font,
void *font_data,
hb_codepoint_t glyph,
hb_glyph_extents_t *extents,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
const hb_ot_face_t *ot_face = ot_font->ot_face;
#if !defined(HB_NO_OT_FONT_BITMAP) && !defined(HB_NO_COLOR)
if (ot_face->sbix->get_extents (font, glyph, extents)) return true;
if (ot_face->CBDT->get_extents (font, glyph, extents)) return true;
#endif
#if !defined(HB_NO_COLOR) && !defined(HB_NO_PAINT)
if (ot_face->COLR->get_extents (font, glyph, extents)) return true;
#endif
if (ot_face->glyf->get_extents (font, glyph, extents)) return true;
#ifndef HB_NO_OT_FONT_CFF
if (ot_face->cff1->get_extents (font, glyph, extents)) return true;
if (ot_face->cff2->get_extents (font, glyph, extents)) return true;
#endif
return false;
}
#ifndef HB_NO_OT_FONT_GLYPH_NAMES
static hb_bool_t
hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
void *font_data,
hb_codepoint_t glyph,
char *name, unsigned int size,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
const hb_ot_face_t *ot_face = ot_font->ot_face;
if (ot_face->post->get_glyph_name (glyph, name, size)) return true;
#ifndef HB_NO_OT_FONT_CFF
if (ot_face->cff1->get_glyph_name (glyph, name, size)) return true;
#endif
return false;
}
static hb_bool_t
hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
void *font_data,
const char *name, int len,
hb_codepoint_t *glyph,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
const hb_ot_face_t *ot_face = ot_font->ot_face;
if (ot_face->post->get_glyph_from_name (name, len, glyph)) return true;
#ifndef HB_NO_OT_FONT_CFF
if (ot_face->cff1->get_glyph_from_name (name, len, glyph)) return true;
#endif
return false;
}
#endif
static hb_bool_t
hb_ot_get_font_h_extents (hb_font_t *font,
void *font_data HB_UNUSED,
hb_font_extents_t *metrics,
void *user_data HB_UNUSED)
{
bool ret = _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER, &metrics->ascender) &&
_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER, &metrics->descender) &&
_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP, &metrics->line_gap);
/* Embolden */
int y_shift = font->y_strength;
if (font->y_scale < 0) y_shift = -y_shift;
metrics->ascender += y_shift;
return ret;
}
#ifndef HB_NO_VERTICAL
static hb_bool_t
hb_ot_get_font_v_extents (hb_font_t *font,
void *font_data HB_UNUSED,
hb_font_extents_t *metrics,
void *user_data HB_UNUSED)
{
return _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_ASCENDER, &metrics->ascender) &&
_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_DESCENDER, &metrics->descender) &&
_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_LINE_GAP, &metrics->line_gap);
}
#endif
#ifndef HB_NO_DRAW
static void
hb_ot_draw_glyph (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
hb_draw_funcs_t *draw_funcs, void *draw_data,
void *user_data)
{
bool embolden = font->x_strength || font->y_strength;
hb_outline_t outline;
{ // Need draw_session to be destructed before emboldening.
hb_draw_session_t draw_session (embolden ? hb_outline_recording_pen_get_funcs () : draw_funcs,
embolden ? &outline : draw_data, font->slant_xy);
if (!font->face->table.glyf->get_path (font, glyph, draw_session))
#ifndef HB_NO_CFF
if (!font->face->table.cff1->get_path (font, glyph, draw_session))
if (!font->face->table.cff2->get_path (font, glyph, draw_session))
#endif
{}
}
if (embolden)
{
float x_shift = font->embolden_in_place ? 0 : (float) font->x_strength / 2;
float y_shift = (float) font->y_strength / 2;
if (font->x_scale < 0) x_shift = -x_shift;
if (font->y_scale < 0) y_shift = -y_shift;
outline.embolden (font->x_strength, font->y_strength,
x_shift, y_shift);
outline.replay (draw_funcs, draw_data);
}
}
#endif
#ifndef HB_NO_PAINT
static void
hb_ot_paint_glyph (hb_font_t *font,
void *font_data,
hb_codepoint_t glyph,
hb_paint_funcs_t *paint_funcs, void *paint_data,
unsigned int palette,
hb_color_t foreground,
void *user_data)
{
#ifndef HB_NO_COLOR
if (font->face->table.COLR->paint_glyph (font, glyph, paint_funcs, paint_data, palette, foreground)) return;
if (font->face->table.SVG->paint_glyph (font, glyph, paint_funcs, paint_data)) return;
#ifndef HB_NO_OT_FONT_BITMAP
if (font->face->table.CBDT->paint_glyph (font, glyph, paint_funcs, paint_data)) return;
if (font->face->table.sbix->paint_glyph (font, glyph, paint_funcs, paint_data)) return;
#endif
#endif
if (font->face->table.glyf->paint_glyph (font, glyph, paint_funcs, paint_data, foreground)) return;
#ifndef HB_NO_CFF
if (font->face->table.cff1->paint_glyph (font, glyph, paint_funcs, paint_data, foreground)) return;
if (font->face->table.cff2->paint_glyph (font, glyph, paint_funcs, paint_data, foreground)) return;
#endif
}
#endif
static inline void free_static_ot_funcs ();
static struct hb_ot_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ot_font_funcs_lazy_loader_t>
{
static hb_font_funcs_t *create ()
{
hb_font_funcs_t *funcs = hb_font_funcs_create ();
hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr);
hb_font_funcs_set_nominal_glyphs_func (funcs, hb_ot_get_nominal_glyphs, nullptr, nullptr);
hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr);
hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
hb_font_funcs_set_glyph_h_advances_func (funcs, hb_ot_get_glyph_h_advances, nullptr, nullptr);
//hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
#ifndef HB_NO_VERTICAL
hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
hb_font_funcs_set_glyph_v_advances_func (funcs, hb_ot_get_glyph_v_advances, nullptr, nullptr);
hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
#endif
#ifndef HB_NO_DRAW
hb_font_funcs_set_draw_glyph_func (funcs, hb_ot_draw_glyph, nullptr, nullptr);
#endif
#ifndef HB_NO_PAINT
hb_font_funcs_set_paint_glyph_func (funcs, hb_ot_paint_glyph, nullptr, nullptr);
#endif
hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr);
//hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr);
#ifndef HB_NO_OT_FONT_GLYPH_NAMES
hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr);
hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr);
#endif
hb_font_funcs_make_immutable (funcs);
hb_atexit (free_static_ot_funcs);
return funcs;
}
} static_ot_funcs;
static inline
void free_static_ot_funcs ()
{
static_ot_funcs.free_instance ();
}
static hb_font_funcs_t *
_hb_ot_get_font_funcs ()
{
return static_ot_funcs.get_unconst ();
}
/**
* hb_ot_font_set_funcs:
* @font: #hb_font_t to work upon
*
* Sets the font functions to use when working with @font.
*
* Since: 0.9.28
**/
void
hb_ot_font_set_funcs (hb_font_t *font)
{
hb_ot_font_t *ot_font = _hb_ot_font_create (font);
if (unlikely (!ot_font))
return;
hb_font_set_funcs (font,
_hb_ot_get_font_funcs (),
ot_font,
_hb_ot_font_destroy);
}
#endif
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