diff options
Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-font.cc')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-font.cc | 1314 |
1 files changed, 652 insertions, 662 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-font.cc b/gfx/harfbuzz/src/hb-ot-font.cc index 5be055d344..ed30688311 100644 --- a/gfx/harfbuzz/src/hb-ot-font.cc +++ b/gfx/harfbuzz/src/hb-ot-font.cc @@ -1,662 +1,652 @@ -/* - * 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-private.hh" - -#include "hb-ot.h" - -#include "hb-font-private.hh" - -#include "hb-ot-cmap-table.hh" -#include "hb-ot-cbdt-table.hh" -#include "hb-ot-glyf-table.hh" -#include "hb-ot-head-table.hh" -#include "hb-ot-hhea-table.hh" -#include "hb-ot-hmtx-table.hh" -#include "hb-ot-os2-table.hh" -//#include "hb-ot-post-table.hh" - - -struct hb_ot_face_metrics_accelerator_t -{ - unsigned int num_metrics; - unsigned int num_advances; - unsigned int default_advance; - unsigned short ascender; - unsigned short descender; - unsigned short line_gap; - bool has_font_extents; - - const OT::_mtx *table; - hb_blob_t *blob; - - inline void init (hb_face_t *face, - hb_tag_t _hea_tag, - hb_tag_t _mtx_tag, - hb_tag_t os2_tag, - unsigned int default_advance = 0) - { - this->default_advance = default_advance ? default_advance : face->get_upem (); - - bool got_font_extents = false; - if (os2_tag) - { - hb_blob_t *os2_blob = OT::Sanitizer<OT::os2>::sanitize (face->reference_table (os2_tag)); - const OT::os2 *os2 = OT::Sanitizer<OT::os2>::lock_instance (os2_blob); -#define USE_TYPO_METRICS (1u<<7) - if (0 != (os2->fsSelection & USE_TYPO_METRICS)) - { - this->ascender = os2->sTypoAscender; - this->descender = os2->sTypoDescender; - this->line_gap = os2->sTypoLineGap; - got_font_extents = (this->ascender | this->descender) != 0; - } - hb_blob_destroy (os2_blob); - } - - hb_blob_t *_hea_blob = OT::Sanitizer<OT::_hea>::sanitize (face->reference_table (_hea_tag)); - const OT::_hea *_hea = OT::Sanitizer<OT::_hea>::lock_instance (_hea_blob); - this->num_advances = _hea->numberOfLongMetrics; - if (!got_font_extents) - { - this->ascender = _hea->ascender; - this->descender = _hea->descender; - this->line_gap = _hea->lineGap; - got_font_extents = (this->ascender | this->descender) != 0; - } - hb_blob_destroy (_hea_blob); - - this->has_font_extents = got_font_extents; - - this->blob = OT::Sanitizer<OT::_mtx>::sanitize (face->reference_table (_mtx_tag)); - - /* Cap num_metrics() and num_advances() based on table length. */ - unsigned int len = hb_blob_get_length (this->blob); - if (unlikely (this->num_advances * 4 > len)) - this->num_advances = len / 4; - this->num_metrics = this->num_advances + (len - 4 * this->num_advances) / 2; - - /* We MUST set num_metrics to zero if num_advances is zero. - * Our get_advance() depends on that. */ - if (unlikely (!this->num_advances)) - { - this->num_metrics = this->num_advances = 0; - hb_blob_destroy (this->blob); - this->blob = hb_blob_get_empty (); - } - this->table = OT::Sanitizer<OT::_mtx>::lock_instance (this->blob); - } - - inline void fini (void) - { - hb_blob_destroy (this->blob); - } - - inline unsigned int get_advance (hb_codepoint_t glyph) const - { - if (unlikely (glyph >= this->num_metrics)) - { - /* If this->num_metrics is zero, it means we don't have the metrics table - * for this direction: return default advance. Otherwise, it means that the - * glyph index is out of bound: return zero. */ - if (this->num_metrics) - return 0; - else - return this->default_advance; - } - - if (glyph >= this->num_advances) - glyph = this->num_advances - 1; - - return this->table->longMetric[glyph].advance; - } -}; - -struct hb_ot_face_glyf_accelerator_t -{ - bool short_offset; - unsigned int num_glyphs; - const OT::loca *loca; - const OT::glyf *glyf; - hb_blob_t *loca_blob; - hb_blob_t *glyf_blob; - unsigned int glyf_len; - - inline void init (hb_face_t *face) - { - hb_blob_t *head_blob = OT::Sanitizer<OT::head>::sanitize (face->reference_table (HB_OT_TAG_head)); - const OT::head *head = OT::Sanitizer<OT::head>::lock_instance (head_blob); - if ((unsigned int) head->indexToLocFormat > 1 || head->glyphDataFormat != 0) - { - /* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */ - hb_blob_destroy (head_blob); - return; - } - this->short_offset = 0 == head->indexToLocFormat; - hb_blob_destroy (head_blob); - - this->loca_blob = OT::Sanitizer<OT::loca>::sanitize (face->reference_table (HB_OT_TAG_loca)); - this->loca = OT::Sanitizer<OT::loca>::lock_instance (this->loca_blob); - this->glyf_blob = OT::Sanitizer<OT::glyf>::sanitize (face->reference_table (HB_OT_TAG_glyf)); - this->glyf = OT::Sanitizer<OT::glyf>::lock_instance (this->glyf_blob); - - this->num_glyphs = MAX (1u, hb_blob_get_length (this->loca_blob) / (this->short_offset ? 2 : 4)) - 1; - this->glyf_len = hb_blob_get_length (this->glyf_blob); - } - - inline void fini (void) - { - hb_blob_destroy (this->loca_blob); - hb_blob_destroy (this->glyf_blob); - } - - inline bool get_extents (hb_codepoint_t glyph, - hb_glyph_extents_t *extents) const - { - if (unlikely (glyph >= this->num_glyphs)) - return false; - - unsigned int start_offset, end_offset; - if (this->short_offset) - { - start_offset = 2 * this->loca->u.shortsZ[glyph]; - end_offset = 2 * this->loca->u.shortsZ[glyph + 1]; - } - else - { - start_offset = this->loca->u.longsZ[glyph]; - end_offset = this->loca->u.longsZ[glyph + 1]; - } - - if (start_offset > end_offset || end_offset > this->glyf_len) - return false; - - if (end_offset - start_offset < OT::glyfGlyphHeader::static_size) - return true; /* Empty glyph; zero extents. */ - - const OT::glyfGlyphHeader &glyph_header = OT::StructAtOffset<OT::glyfGlyphHeader> (this->glyf, start_offset); - - extents->x_bearing = MIN (glyph_header.xMin, glyph_header.xMax); - extents->y_bearing = MAX (glyph_header.yMin, glyph_header.yMax); - extents->width = MAX (glyph_header.xMin, glyph_header.xMax) - extents->x_bearing; - extents->height = MIN (glyph_header.yMin, glyph_header.yMax) - extents->y_bearing; - - return true; - } -}; - -struct hb_ot_face_cbdt_accelerator_t -{ - hb_blob_t *cblc_blob; - hb_blob_t *cbdt_blob; - const OT::CBLC *cblc; - const OT::CBDT *cbdt; - - unsigned int cbdt_len; - float upem; - - inline void init (hb_face_t *face) - { - upem = face->get_upem(); - - cblc_blob = OT::Sanitizer<OT::CBLC>::sanitize (face->reference_table (HB_OT_TAG_CBLC)); - cbdt_blob = OT::Sanitizer<OT::CBDT>::sanitize (face->reference_table (HB_OT_TAG_CBDT)); - cbdt_len = hb_blob_get_length (cbdt_blob); - - if (hb_blob_get_length (cblc_blob) == 0) { - cblc = NULL; - cbdt = NULL; - return; /* Not a bitmap font. */ - } - cblc = OT::Sanitizer<OT::CBLC>::lock_instance (cblc_blob); - cbdt = OT::Sanitizer<OT::CBDT>::lock_instance (cbdt_blob); - - } - - inline void fini (void) - { - hb_blob_destroy (this->cblc_blob); - hb_blob_destroy (this->cbdt_blob); - } - - inline bool get_extents (hb_codepoint_t glyph, hb_glyph_extents_t *extents) const - { - unsigned int x_ppem = upem, y_ppem = upem; /* TODO Use font ppem if available. */ - - if (cblc == NULL) - return false; // Not a color bitmap font. - - const OT::IndexSubtableRecord *subtable_record = this->cblc->find_table(glyph, &x_ppem, &y_ppem); - if (subtable_record == NULL) - return false; - - if (subtable_record->get_extents (extents)) - return true; - - unsigned int image_offset = 0, image_length = 0, image_format = 0; - if (!subtable_record->get_image_data (glyph, &image_offset, &image_length, &image_format)) - return false; - - { - /* TODO Move the following into CBDT struct when adding more formats. */ - - if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length)) - return false; - - switch (image_format) - { - case 17: { - if (unlikely (image_length < OT::GlyphBitmapDataFormat17::min_size)) - return false; - - const OT::GlyphBitmapDataFormat17& glyphFormat17 = - OT::StructAtOffset<OT::GlyphBitmapDataFormat17> (this->cbdt, image_offset); - glyphFormat17.glyphMetrics.get_extents (extents); - } - break; - default: - // TODO: Support other image formats. - return false; - } - } - - /* Convert to the font units. */ - extents->x_bearing *= upem / (float) x_ppem; - extents->y_bearing *= upem / (float) y_ppem; - extents->width *= upem / (float) x_ppem; - extents->height *= upem / (float) y_ppem; - - return true; - } -}; - -typedef bool (*hb_cmap_get_glyph_func_t) (const void *obj, - hb_codepoint_t codepoint, - hb_codepoint_t *glyph); - -template <typename Type> -static inline bool get_glyph_from (const void *obj, - hb_codepoint_t codepoint, - hb_codepoint_t *glyph) -{ - const Type *typed_obj = (const Type *) obj; - return typed_obj->get_glyph (codepoint, glyph); -} - -template <typename Type> -static inline bool get_glyph_from_symbol (const void *obj, - hb_codepoint_t codepoint, - hb_codepoint_t *glyph) -{ - const Type *typed_obj = (const Type *) obj; - if (likely (typed_obj->get_glyph (codepoint, glyph))) - return true; - - if (codepoint <= 0x00FFu) - { - /* For symbol-encoded OpenType fonts, we duplicate the - * U+F000..F0FF range at U+0000..U+00FF. That's what - * Windows seems to do, and that's hinted about at: - * http://www.microsoft.com/typography/otspec/recom.htm - * under "Non-Standard (Symbol) Fonts". */ - return typed_obj->get_glyph (0xF000u + codepoint, glyph); - } - - return false; -} - -struct hb_ot_face_cmap_accelerator_t -{ - hb_cmap_get_glyph_func_t get_glyph_func; - const void *get_glyph_data; - OT::CmapSubtableFormat4::accelerator_t format4_accel; - - const OT::CmapSubtableFormat14 *uvs_table; - hb_blob_t *blob; - - inline void init (hb_face_t *face) - { - this->blob = OT::Sanitizer<OT::cmap>::sanitize (face->reference_table (HB_OT_TAG_cmap)); - const OT::cmap *cmap = OT::Sanitizer<OT::cmap>::lock_instance (this->blob); - const OT::CmapSubtable *subtable = NULL; - const OT::CmapSubtableFormat14 *subtable_uvs = NULL; - - bool symbol = false; - /* 32-bit subtables. */ - if (!subtable) subtable = cmap->find_subtable (3, 10); - if (!subtable) subtable = cmap->find_subtable (0, 6); - if (!subtable) subtable = cmap->find_subtable (0, 4); - /* 16-bit subtables. */ - if (!subtable) subtable = cmap->find_subtable (3, 1); - if (!subtable) subtable = cmap->find_subtable (0, 3); - if (!subtable) subtable = cmap->find_subtable (0, 2); - if (!subtable) subtable = cmap->find_subtable (0, 1); - if (!subtable) subtable = cmap->find_subtable (0, 0); - if (!subtable) - { - subtable = cmap->find_subtable (3, 0); - if (subtable) symbol = true; - } - /* Meh. */ - if (!subtable) subtable = &OT::Null(OT::CmapSubtable); - - /* UVS subtable. */ - if (!subtable_uvs) - { - const OT::CmapSubtable *st = cmap->find_subtable (0, 5); - if (st && st->u.format == 14) - subtable_uvs = &st->u.format14; - } - /* Meh. */ - if (!subtable_uvs) subtable_uvs = &OT::Null(OT::CmapSubtableFormat14); - - this->uvs_table = subtable_uvs; - - this->get_glyph_data = subtable; - if (unlikely (symbol)) - this->get_glyph_func = get_glyph_from_symbol<OT::CmapSubtable>; - else - switch (subtable->u.format) { - /* Accelerate format 4 and format 12. */ - default: this->get_glyph_func = get_glyph_from<OT::CmapSubtable>; break; - case 12: this->get_glyph_func = get_glyph_from<OT::CmapSubtableFormat12>; break; - case 4: - { - this->format4_accel.init (&subtable->u.format4); - this->get_glyph_data = &this->format4_accel; - this->get_glyph_func = this->format4_accel.get_glyph_func; - } - break; - } - } - - inline void fini (void) - { - hb_blob_destroy (this->blob); - } - - inline bool get_nominal_glyph (hb_codepoint_t unicode, - hb_codepoint_t *glyph) const - { - return this->get_glyph_func (this->get_glyph_data, unicode, glyph); - } - - inline bool get_variation_glyph (hb_codepoint_t unicode, - hb_codepoint_t variation_selector, - hb_codepoint_t *glyph) const - { - switch (this->uvs_table->get_glyph_variant (unicode, - variation_selector, - glyph)) - { - case OT::GLYPH_VARIANT_NOT_FOUND: return false; - case OT::GLYPH_VARIANT_FOUND: return true; - case OT::GLYPH_VARIANT_USE_DEFAULT: break; - } - - return get_nominal_glyph (unicode, glyph); - } -}; - -template <typename T> -struct hb_lazy_loader_t -{ - inline void init (hb_face_t *face_) - { - face = face_; - instance = NULL; - } - - inline void fini (void) - { - if (instance && instance != &OT::Null(T)) - { - instance->fini(); - free (instance); - } - } - - inline const T* operator-> (void) const - { - retry: - T *p = (T *) hb_atomic_ptr_get (&instance); - if (unlikely (!p)) - { - p = (T *) calloc (1, sizeof (T)); - if (unlikely (!p)) - return &OT::Null(T); - p->init (face); - if (unlikely (!hb_atomic_ptr_cmpexch (const_cast<T **>(&instance), NULL, p))) - { - p->fini (); - goto retry; - } - } - return p; - } - - private: - hb_face_t *face; - T *instance; -}; - -struct hb_ot_font_t -{ - hb_ot_face_cmap_accelerator_t cmap; - hb_ot_face_metrics_accelerator_t h_metrics; - hb_ot_face_metrics_accelerator_t v_metrics; - hb_lazy_loader_t<hb_ot_face_glyf_accelerator_t> glyf; - hb_lazy_loader_t<hb_ot_face_cbdt_accelerator_t> cbdt; -}; - - -static hb_ot_font_t * -_hb_ot_font_create (hb_face_t *face) -{ - hb_ot_font_t *ot_font = (hb_ot_font_t *) calloc (1, sizeof (hb_ot_font_t)); - - if (unlikely (!ot_font)) - return NULL; - - ot_font->cmap.init (face); - ot_font->h_metrics.init (face, HB_OT_TAG_hhea, HB_OT_TAG_hmtx, HB_OT_TAG_os2); - ot_font->v_metrics.init (face, HB_OT_TAG_vhea, HB_OT_TAG_vmtx, HB_TAG_NONE, - ot_font->h_metrics.ascender - ot_font->h_metrics.descender); /* TODO Can we do this lazily? */ - ot_font->glyf.init (face); - ot_font->cbdt.init (face); - - return ot_font; -} - -static void -_hb_ot_font_destroy (hb_ot_font_t *ot_font) -{ - ot_font->cmap.fini (); - ot_font->h_metrics.fini (); - ot_font->v_metrics.fini (); - ot_font->glyf.fini (); - ot_font->cbdt.fini (); - - 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; - return ot_font->cmap.get_nominal_glyph (unicode, glyph); -} - -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; - return ot_font->cmap.get_variation_glyph (unicode, variation_selector, glyph); -} - -static hb_position_t -hb_ot_get_glyph_h_advance (hb_font_t *font HB_UNUSED, - void *font_data, - hb_codepoint_t glyph, - void *user_data HB_UNUSED) -{ - const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data; - return font->em_scale_x (ot_font->h_metrics.get_advance (glyph)); -} - -static hb_position_t -hb_ot_get_glyph_v_advance (hb_font_t *font HB_UNUSED, - void *font_data, - hb_codepoint_t glyph, - void *user_data HB_UNUSED) -{ - const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data; - return font->em_scale_y (-(int) ot_font->v_metrics.get_advance (glyph)); -} - -static hb_bool_t -hb_ot_get_glyph_extents (hb_font_t *font HB_UNUSED, - 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; - bool ret = ot_font->glyf->get_extents (glyph, extents); - if (!ret) - ret = ot_font->cbdt->get_extents (glyph, extents); - extents->x_bearing = font->em_scale_x (extents->x_bearing); - extents->y_bearing = font->em_scale_y (extents->y_bearing); - extents->width = font->em_scale_x (extents->width); - extents->height = font->em_scale_y (extents->height); - return ret; -} - -static hb_bool_t -hb_ot_get_font_h_extents (hb_font_t *font HB_UNUSED, - void *font_data, - hb_font_extents_t *metrics, - void *user_data HB_UNUSED) -{ - const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data; - metrics->ascender = font->em_scale_y (ot_font->h_metrics.ascender); - metrics->descender = font->em_scale_y (ot_font->h_metrics.descender); - metrics->line_gap = font->em_scale_y (ot_font->h_metrics.line_gap); - return ot_font->h_metrics.has_font_extents; -} - -static hb_bool_t -hb_ot_get_font_v_extents (hb_font_t *font HB_UNUSED, - void *font_data, - hb_font_extents_t *metrics, - void *user_data HB_UNUSED) -{ - const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data; - metrics->ascender = font->em_scale_x (ot_font->v_metrics.ascender); - metrics->descender = font->em_scale_x (ot_font->v_metrics.descender); - metrics->line_gap = font->em_scale_x (ot_font->v_metrics.line_gap); - return ot_font->v_metrics.has_font_extents; -} - -static hb_font_funcs_t *static_ot_funcs = NULL; - -#ifdef HB_USE_ATEXIT -static -void free_static_ot_funcs (void) -{ - hb_font_funcs_destroy (static_ot_funcs); -} -#endif - -static hb_font_funcs_t * -_hb_ot_get_font_funcs (void) -{ -retry: - hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ot_funcs); - - if (unlikely (!funcs)) - { - funcs = hb_font_funcs_create (); - - hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, NULL, NULL); - hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, NULL, NULL); - hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, NULL, NULL); - hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, NULL, NULL); - hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, NULL, NULL); - hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, NULL, NULL); - //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, NULL, NULL); - //hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, NULL, NULL); - //hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, NULL, NULL); TODO - //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, NULL, NULL); - hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, NULL, NULL); - //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, NULL, NULL); TODO - //hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, NULL, NULL); TODO - //hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, NULL, NULL); TODO - - hb_font_funcs_make_immutable (funcs); - - if (!hb_atomic_ptr_cmpexch (&static_ot_funcs, NULL, funcs)) { - hb_font_funcs_destroy (funcs); - goto retry; - } - -#ifdef HB_USE_ATEXIT - atexit (free_static_ot_funcs); /* First person registers atexit() callback. */ -#endif - }; - - return funcs; -} - - -/** - * hb_ot_font_set_funcs: - * - * 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->face); - if (unlikely (!ot_font)) - return; - - hb_font_set_funcs (font, - _hb_ot_get_font_funcs (), - ot_font, - (hb_destroy_func_t) _hb_ot_font_destroy); -} +/*
+ * 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>;
+
+static hb_user_data_key_t hb_ot_font_cmap_cache_user_data_key;
+
+struct hb_ot_font_t
+{
+ const hb_ot_face_t *ot_face;
+
+ hb_ot_font_cmap_cache_t *cmap_cache;
+
+ /* 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;
+
+ // 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;
+
+ 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;
+ return ot_face->cmap->get_nominal_glyph (unicode, glyph, ot_font->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;
+ return ot_face->cmap->get_nominal_glyphs (count,
+ first_unicode, unicode_stride,
+ first_glyph, glyph_stride,
+ ot_font->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;
+ return ot_face->cmap->get_variation_glyph (unicode,
+ variation_selector, glyph,
+ ot_font->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;
+
+#ifndef HB_NO_VAR
+ 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);
+ }
+ }
+
+#ifndef HB_NO_VAR
+ 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 ())
+ {
+#ifndef HB_NO_VAR
+ 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);
+ }
+
+#ifndef HB_NO_VAR
+ 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)
+ 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);
+}
+
+#ifndef HB_NO_VAR
+bool
+_glyf_get_leading_bearing_with_var_unscaled (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical,
+ int *lsb)
+{
+ return font->face->table.glyf->get_leading_bearing_with_var_unscaled (font, glyph, is_vertical, lsb);
+}
+
+unsigned
+_glyf_get_advance_with_var_unscaled (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical)
+{
+ return font->face->table.glyf->get_advance_with_var_unscaled (font, glyph, is_vertical);
+}
+#endif
+
+
+#endif
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