kc3-lang/harfbuzz/src/hb-static.cc

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• Hash : ed6d287d
  Author :
  Date : 2022-02-02T14:10:16
  

  [ot-face] Load num-glyphs from `loca` table before `maxp`
  
  Implements [boring-expansion] [maxp] Relax
  https://github.com/be-fonts/boring-expansion-spec/issues/6
  

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• src/hb-static.cc

• /*
   * Copyright © 2018  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
   */
  
  #include "hb.hh"
  
  #include "hb-open-type.hh"
  #include "hb-face.hh"
  
  #include "hb-aat-layout-common.hh"
  #include "hb-aat-layout-feat-table.hh"
  #include "hb-ot-layout-common.hh"
  #include "hb-ot-cmap-table.hh"
  #include "hb-ot-glyf-table.hh"
  #include "hb-ot-head-table.hh"
  #include "hb-ot-maxp-table.hh"
  
  #ifndef HB_NO_VISIBILITY
  #include "hb-ot-name-language-static.hh"
  
  uint64_t const _hb_NullPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)] = {};
  /*thread_local*/ uint64_t _hb_CrapPool[(HB_NULL_POOL_SIZE + sizeof (uint64_t) - 1) / sizeof (uint64_t)] = {};
  
  DEFINE_NULL_NAMESPACE_BYTES (OT, Index) =  {0xFF,0xFF};
  DEFINE_NULL_NAMESPACE_BYTES (OT, VarIdx) =  {0xFF,0xFF,0xFF,0xFF};
  DEFINE_NULL_NAMESPACE_BYTES (OT, LangSys) = {0x00,0x00, 0xFF,0xFF, 0x00,0x00};
  DEFINE_NULL_NAMESPACE_BYTES (OT, RangeRecord) = {0x00,0x01, 0x00,0x00, 0x00, 0x00};
  DEFINE_NULL_NAMESPACE_BYTES (OT, CmapSubtableLongGroup) = {0x00,0x00,0x00,0x01, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00};
  DEFINE_NULL_NAMESPACE_BYTES (AAT, SettingName) = {0xFF,0xFF, 0xFF,0xFF};
  /* Hand-coded because Lookup is a template.  Sad. */
  const unsigned char _hb_Null_AAT_Lookup[2] = {0xFF, 0xFF};
  
  
  
  /* hb_face_t */
  
  static inline unsigned
  load_num_glyphs_from_loca (const hb_face_t *face)
  {
    unsigned ret = 0;
    hb_sanitize_context_t c = hb_sanitize_context_t ();
    c.set_num_glyphs (0); /* So we don't recurse ad infinitum. */
  
    /* We cannot use table.head because that would use sanitizer,
     * which would try accessing face.num_glyphs, which would
     * recurse here again... */
    hb_blob_t *head_blob = c.reference_table<OT::head> (face);
    const OT::head *head_table = head_blob->as<OT::head> ();
    unsigned indexToLocFormat = head_table->indexToLocFormat;
    hb_blob_destroy (head_blob);
  
    if (indexToLocFormat <= 1)
    {
      bool short_offset = 0 == indexToLocFormat;
      hb_blob_t *loca_blob = c.reference_table<OT::loca> (face);
      ret = hb_max (1u, loca_blob->length / (short_offset ? 2 : 4)) - 1;
      hb_blob_destroy (loca_blob);
    }
  
    return ret;
  }
  
  static inline unsigned
  load_num_glyphs_from_maxp (const hb_face_t *face)
  {
    unsigned ret = 0;
    hb_sanitize_context_t c = hb_sanitize_context_t ();
    c.set_num_glyphs (0); /* So we don't recurse ad infinitum. */
  
    hb_blob_t *maxp_blob = c.reference_table<OT::maxp> (face);
    const OT::maxp *maxp_table = maxp_blob->as<OT::maxp> ();
    ret = maxp_table->get_num_glyphs ();
    hb_blob_destroy (maxp_blob);
  
    return ret;
  }
  
  unsigned int
  hb_face_t::load_num_glyphs () const
  {
    unsigned ret = 0;
  
    ret = load_num_glyphs_from_loca (this);
  
    if (!ret)
      ret = load_num_glyphs_from_maxp (this);
  
    num_glyphs.set_relaxed (ret);
    return ret;
  }
  
  unsigned int
  hb_face_t::load_upem () const
  {
    unsigned int ret = table.head->get_upem ();
    upem.set_relaxed (ret);
    return ret;
  }
  
  
  /* hb_user_data_array_t */
  
  bool
  hb_user_data_array_t::set (hb_user_data_key_t *key,
  			   void *              data,
  			   hb_destroy_func_t   destroy,
  			   hb_bool_t           replace)
  {
    if (!key)
      return false;
  
    if (replace) {
      if (!data && !destroy) {
        items.remove (key, lock);
        return true;
      }
    }
    hb_user_data_item_t item = {key, data, destroy};
    bool ret = !!items.replace_or_insert (item, lock, (bool) replace);
  
    return ret;
  }
  
  void *
  hb_user_data_array_t::get (hb_user_data_key_t *key)
  {
    hb_user_data_item_t item = {nullptr, nullptr, nullptr};
  
    return items.find (key, &item, lock) ? item.data : nullptr;
  }
  
  
  #endif
  

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