619 lines
18 KiB
C++
619 lines
18 KiB
C++
/*
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* Copyright © 2011,2014 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod, Roozbeh Pournader
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*/
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#include "hb.hh"
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#ifndef HB_NO_OT_FONT
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#include "hb-ot.h"
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#include "hb-cache.hh"
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#include "hb-font.hh"
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#include "hb-machinery.hh"
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#include "hb-ot-face.hh"
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#include "hb-ot-cmap-table.hh"
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#include "hb-ot-glyf-table.hh"
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#include "hb-ot-cff2-table.hh"
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#include "hb-ot-cff1-table.hh"
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#include "hb-ot-hmtx-table.hh"
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#include "hb-ot-post-table.hh"
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#include "hb-ot-stat-table.hh"
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#include "hb-ot-var-varc-table.hh"
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#include "hb-ot-vorg-table.hh"
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#include "OT/Color/CBDT/CBDT.hh"
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#include "OT/Color/COLR/COLR.hh"
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#include "OT/Color/sbix/sbix.hh"
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#include "OT/Color/svg/svg.hh"
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/**
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* SECTION:hb-ot-font
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* @title: hb-ot-font
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* @short_description: OpenType font implementation
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* @include: hb-ot.h
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*
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* Functions for using OpenType fonts with hb_shape(). Note that fonts returned
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* by hb_font_create() default to using these functions, so most clients would
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* never need to call these functions directly.
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**/
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using hb_ot_font_advance_cache_t = hb_cache_t<24, 16>;
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static_assert (sizeof (hb_ot_font_advance_cache_t) == 1024, "");
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struct hb_ot_font_t
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{
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const hb_ot_face_t *ot_face;
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/* h_advance caching */
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mutable hb_atomic_t<int> cached_coords_serial;
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struct advance_cache_t
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{
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mutable hb_atomic_t<hb_ot_font_advance_cache_t *> advance_cache;
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mutable hb_atomic_t<OT::ItemVariationStore::cache_t *> varStore_cache;
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~advance_cache_t ()
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{
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clear ();
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}
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hb_ot_font_advance_cache_t *acquire_advance_cache () const
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{
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retry:
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auto *cache = advance_cache.get_acquire ();
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if (!cache)
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{
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cache = (hb_ot_font_advance_cache_t *) hb_malloc (sizeof (hb_ot_font_advance_cache_t));
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if (!cache)
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return nullptr;
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new (cache) hb_ot_font_advance_cache_t;
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return cache;
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}
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if (advance_cache.cmpexch (cache, nullptr))
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return cache;
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else
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goto retry;
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}
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void release_advance_cache (hb_ot_font_advance_cache_t *cache) const
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{
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if (!cache)
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return;
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if (!advance_cache.cmpexch (nullptr, cache))
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hb_free (cache);
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}
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void clear_advance_cache () const
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{
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retry:
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auto *cache = advance_cache.get_acquire ();
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if (!cache)
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return;
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if (advance_cache.cmpexch (cache, nullptr))
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hb_free (cache);
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else
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goto retry;
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}
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OT::ItemVariationStore::cache_t *acquire_varStore_cache (const OT::ItemVariationStore &varStore) const
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{
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retry:
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auto *cache = varStore_cache.get_acquire ();
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if (!cache)
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return varStore.create_cache ();
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if (varStore_cache.cmpexch (cache, nullptr))
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return cache;
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else
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goto retry;
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}
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void release_varStore_cache (OT::ItemVariationStore::cache_t *cache) const
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{
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if (!cache)
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return;
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if (!varStore_cache.cmpexch (nullptr, cache))
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OT::ItemVariationStore::destroy_cache (cache);
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}
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void clear_varStore_cache () const
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{
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retry:
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auto *cache = varStore_cache.get_acquire ();
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if (!cache)
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return;
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if (varStore_cache.cmpexch (cache, nullptr))
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OT::ItemVariationStore::destroy_cache (cache);
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else
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goto retry;
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}
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void clear () const
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{
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clear_advance_cache ();
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clear_varStore_cache ();
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}
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} h, v;
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void check_serial (hb_font_t *font) const
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{
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int font_serial = font->serial_coords.get_acquire ();
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if (cached_coords_serial.get_acquire () == font_serial)
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return;
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h.clear ();
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v.clear ();
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cached_coords_serial.set_release (font_serial);
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}
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};
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static hb_ot_font_t *
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_hb_ot_font_create (hb_font_t *font)
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{
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hb_ot_font_t *ot_font = (hb_ot_font_t *) hb_calloc (1, sizeof (hb_ot_font_t));
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if (unlikely (!ot_font))
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return nullptr;
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ot_font->ot_face = &font->face->table;
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return ot_font;
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}
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static void
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_hb_ot_font_destroy (void *font_data)
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{
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hb_ot_font_t *ot_font = (hb_ot_font_t *) font_data;
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ot_font->~hb_ot_font_t ();
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hb_free (ot_font);
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}
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static hb_bool_t
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hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
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void *font_data,
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hb_codepoint_t unicode,
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hb_codepoint_t *glyph,
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void *user_data HB_UNUSED)
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{
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const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
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const hb_ot_face_t *ot_face = ot_font->ot_face;
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return ot_face->cmap->get_nominal_glyph (unicode, glyph);
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}
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static unsigned int
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hb_ot_get_nominal_glyphs (hb_font_t *font HB_UNUSED,
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void *font_data,
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unsigned int count,
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const hb_codepoint_t *first_unicode,
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unsigned int unicode_stride,
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hb_codepoint_t *first_glyph,
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unsigned int glyph_stride,
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void *user_data HB_UNUSED)
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{
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const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
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const hb_ot_face_t *ot_face = ot_font->ot_face;
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return ot_face->cmap->get_nominal_glyphs (count,
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first_unicode, unicode_stride,
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first_glyph, glyph_stride);
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}
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static hb_bool_t
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hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
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void *font_data,
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hb_codepoint_t unicode,
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hb_codepoint_t variation_selector,
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hb_codepoint_t *glyph,
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void *user_data HB_UNUSED)
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{
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const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
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const hb_ot_face_t *ot_face = ot_font->ot_face;
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return ot_face->cmap->get_variation_glyph (unicode,
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variation_selector, glyph);
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}
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static void
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hb_ot_get_glyph_h_advances (hb_font_t* font, void* font_data,
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unsigned count,
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const hb_codepoint_t *first_glyph,
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unsigned glyph_stride,
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hb_position_t *first_advance,
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unsigned advance_stride,
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void *user_data HB_UNUSED)
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{
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const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
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const hb_ot_face_t *ot_face = ot_font->ot_face;
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const OT::hmtx_accelerator_t &hmtx = *ot_face->hmtx;
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ot_font->check_serial (font);
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const OT::HVAR &HVAR = *hmtx.var_table;
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const OT::ItemVariationStore &varStore = &HVAR + HVAR.varStore;
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OT::ItemVariationStore::cache_t *varStore_cache = ot_font->h.acquire_varStore_cache (varStore);
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hb_ot_font_advance_cache_t *advance_cache = nullptr;
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bool use_cache = font->num_coords;
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if (use_cache)
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{
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advance_cache = ot_font->h.acquire_advance_cache ();
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if (!advance_cache)
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use_cache = false;
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}
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if (!use_cache)
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{
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for (unsigned int i = 0; i < count; i++)
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{
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*first_advance = font->em_scale_x (hmtx.get_advance_with_var_unscaled (*first_glyph, font, varStore_cache));
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first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
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first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
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}
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}
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else
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{ /* Use cache. */
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for (unsigned int i = 0; i < count; i++)
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{
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hb_position_t v;
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unsigned cv;
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if (advance_cache->get (*first_glyph, &cv))
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v = cv;
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else
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{
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v = hmtx.get_advance_with_var_unscaled (*first_glyph, font, varStore_cache);
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advance_cache->set (*first_glyph, v);
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}
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*first_advance = font->em_scale_x (v);
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first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
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first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
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}
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ot_font->h.release_advance_cache (advance_cache);
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}
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ot_font->h.release_varStore_cache (varStore_cache);
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}
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#ifndef HB_NO_VERTICAL
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static void
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hb_ot_get_glyph_v_advances (hb_font_t* font, void* font_data,
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unsigned count,
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const hb_codepoint_t *first_glyph,
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unsigned glyph_stride,
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hb_position_t *first_advance,
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unsigned advance_stride,
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void *user_data HB_UNUSED)
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{
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const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
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const hb_ot_face_t *ot_face = ot_font->ot_face;
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const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
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if (vmtx.has_data ())
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{
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ot_font->check_serial (font);
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const OT::VVAR &VVAR = *vmtx.var_table;
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const OT::ItemVariationStore &varStore = &VVAR + VVAR.varStore;
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OT::ItemVariationStore::cache_t *varStore_cache = ot_font->v.acquire_varStore_cache (varStore);
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// TODO Use advance_cache.
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for (unsigned int i = 0; i < count; i++)
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{
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*first_advance = font->em_scale_y (-(int) vmtx.get_advance_with_var_unscaled (*first_glyph, font, varStore_cache));
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first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
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first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
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}
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ot_font->v.release_varStore_cache (varStore_cache);
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}
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else
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{
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hb_font_extents_t font_extents;
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font->get_h_extents_with_fallback (&font_extents);
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hb_position_t advance = -(font_extents.ascender - font_extents.descender);
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for (unsigned int i = 0; i < count; i++)
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{
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*first_advance = advance;
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first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
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first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
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}
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}
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}
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#endif
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#ifndef HB_NO_VERTICAL
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static hb_bool_t
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hb_ot_get_glyph_v_origin (hb_font_t *font,
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void *font_data,
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hb_codepoint_t glyph,
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hb_position_t *x,
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hb_position_t *y,
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void *user_data HB_UNUSED)
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{
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const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
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const hb_ot_face_t *ot_face = ot_font->ot_face;
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*x = font->get_glyph_h_advance (glyph) / 2;
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const OT::VORG &VORG = *ot_face->VORG;
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if (VORG.has_data ())
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{
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float delta = 0;
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#ifndef HB_NO_VAR
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const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
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const OT::VVAR &VVAR = *vmtx.var_table;
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if (font->num_coords)
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VVAR.get_vorg_delta_unscaled (glyph,
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font->coords, font->num_coords,
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&delta);
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#endif
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*y = font->em_scalef_y (VORG.get_y_origin (glyph) + delta);
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return true;
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}
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hb_glyph_extents_t extents = {0};
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if (hb_font_get_glyph_extents (font, glyph, &extents))
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{
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const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
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int tsb = 0;
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if (vmtx.get_leading_bearing_with_var_unscaled (font, glyph, &tsb))
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{
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*y = extents.y_bearing + font->em_scale_y (tsb);
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return true;
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}
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hb_font_extents_t font_extents;
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font->get_h_extents_with_fallback (&font_extents);
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hb_position_t advance = font_extents.ascender - font_extents.descender;
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hb_position_t diff = advance - -extents.height;
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*y = extents.y_bearing + (diff >> 1);
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return true;
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}
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hb_font_extents_t font_extents;
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font->get_h_extents_with_fallback (&font_extents);
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*y = font_extents.ascender;
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return true;
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}
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#endif
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static hb_bool_t
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hb_ot_get_glyph_extents (hb_font_t *font,
|
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void *font_data,
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hb_codepoint_t glyph,
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hb_glyph_extents_t *extents,
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void *user_data HB_UNUSED)
|
|
{
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const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
|
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const hb_ot_face_t *ot_face = ot_font->ot_face;
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|
|
|
#if !defined(HB_NO_OT_FONT_BITMAP) && !defined(HB_NO_COLOR)
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if (ot_face->sbix->get_extents (font, glyph, extents)) return true;
|
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if (ot_face->CBDT->get_extents (font, glyph, extents)) return true;
|
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#endif
|
|
#if !defined(HB_NO_COLOR) && !defined(HB_NO_PAINT)
|
|
if (ot_face->COLR->get_extents (font, glyph, extents)) return true;
|
|
#endif
|
|
#ifndef HB_NO_VAR_COMPOSITES
|
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if (ot_face->VARC->get_extents (font, glyph, extents)) return true;
|
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#endif
|
|
if (ot_face->glyf->get_extents (font, glyph, extents)) return true;
|
|
#ifndef HB_NO_OT_FONT_CFF
|
|
if (ot_face->cff2->get_extents (font, glyph, extents)) return true;
|
|
if (ot_face->cff1->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)
|
|
{
|
|
return _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);
|
|
}
|
|
|
|
#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 hb_bool_t
|
|
hb_ot_draw_glyph_or_fail (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)
|
|
{
|
|
hb_draw_session_t draw_session {draw_funcs, draw_data};
|
|
#ifndef HB_NO_VAR_COMPOSITES
|
|
if (font->face->table.VARC->get_path (font, glyph, draw_session)) return true;
|
|
#endif
|
|
// Keep the following in synch with VARC::get_path_at()
|
|
if (font->face->table.glyf->get_path (font, glyph, draw_session)) return true;
|
|
#ifndef HB_NO_CFF
|
|
if (font->face->table.cff2->get_path (font, glyph, draw_session)) return true;
|
|
if (font->face->table.cff1->get_path (font, glyph, draw_session)) return true;
|
|
#endif
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
#ifndef HB_NO_PAINT
|
|
static hb_bool_t
|
|
hb_ot_paint_glyph_or_fail (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 true;
|
|
if (font->face->table.SVG->paint_glyph (font, glyph, paint_funcs, paint_data)) return true;
|
|
#ifndef HB_NO_OT_FONT_BITMAP
|
|
if (font->face->table.CBDT->paint_glyph (font, glyph, paint_funcs, paint_data)) return true;
|
|
if (font->face->table.sbix->paint_glyph (font, glyph, paint_funcs, paint_data)) return true;
|
|
#endif
|
|
#endif
|
|
return false;
|
|
}
|
|
#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_or_fail_func (funcs, hb_ot_draw_glyph_or_fail, nullptr, nullptr);
|
|
#endif
|
|
|
|
#ifndef HB_NO_PAINT
|
|
hb_font_funcs_set_paint_glyph_or_fail_func (funcs, hb_ot_paint_glyph_or_fail, 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 to
|
|
* the HarfBuzz's native implementation. This is the default
|
|
* for fonts newly created.
|
|
*
|
|
* 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
|