kc3-lang/harfbuzz/src/hb-subset-accelerator.hh

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• Hash : f772071f
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  Date : 2023-05-07T13:42:00
  

  [subset-plan] Another error check
  

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• src/hb-subset-accelerator.hh

• /*
   * Copyright © 2022  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): Garret Rieger
   */
  
  #ifndef HB_SUBSET_ACCELERATOR_HH
  #define HB_SUBSET_ACCELERATOR_HH
  
  
  #include "hb.hh"
  
  #include "hb-map.hh"
  #include "hb-multimap.hh"
  #include "hb-set.hh"
  
  extern HB_INTERNAL hb_user_data_key_t _hb_subset_accelerator_user_data_key;
  
  namespace CFF {
  struct cff_subset_accelerator_t;
  }
  
  namespace OT {
  struct SubtableUnicodesCache;
  };
  
  struct hb_subset_accelerator_t
  {
    static hb_user_data_key_t* user_data_key()
    {
      return &_hb_subset_accelerator_user_data_key;
    }
  
    static hb_subset_accelerator_t* create(const hb_map_t& unicode_to_gid_,
  					 const hb_multimap_t gid_to_unicodes_,
  					 const hb_set_t& unicodes_,
  					 bool has_seac_) {
      hb_subset_accelerator_t* accel =
          (hb_subset_accelerator_t*) hb_calloc (1, sizeof(hb_subset_accelerator_t));
  
      if (unlikely (!accel)) return accel;
  
      new (accel) hb_subset_accelerator_t (unicode_to_gid_,
  					 gid_to_unicodes_,
  					 unicodes_,
  					 has_seac_);
  
      return accel;
    }
  
    static void destroy (void* p)
    {
      if (!p) return;
  
      hb_subset_accelerator_t *accel = (hb_subset_accelerator_t *) p;
  
      accel->~hb_subset_accelerator_t ();
  
      hb_free (accel);
    }
  
    hb_subset_accelerator_t (const hb_map_t& unicode_to_gid_,
  			   const hb_multimap_t& gid_to_unicodes_,
  			   const hb_set_t& unicodes_,
  			   bool has_seac_) :
      unicode_to_gid(unicode_to_gid_),
      gid_to_unicodes (gid_to_unicodes_),
      unicodes(unicodes_),
      cmap_cache(nullptr),
      destroy_cmap_cache(nullptr),
      has_seac(has_seac_),
      cff_accelerator(nullptr),
      destroy_cff_accelerator(nullptr) {}
  
    ~hb_subset_accelerator_t ()
    {
      if (cff_accelerator && destroy_cff_accelerator)
        destroy_cff_accelerator ((void*) cff_accelerator);
  
      if (cmap_cache && destroy_cmap_cache)
        destroy_cmap_cache ((void*) cmap_cache);
    }
  
    // Generic
  
    mutable hb_mutex_t sanitized_table_cache_lock;
    mutable hb_hashmap_t<hb_tag_t, hb::unique_ptr<hb_blob_t>> sanitized_table_cache;
  
    const hb_map_t unicode_to_gid;
    const hb_multimap_t gid_to_unicodes;
    const hb_set_t unicodes;
  
    // cmap
    const OT::SubtableUnicodesCache* cmap_cache;
    hb_destroy_func_t destroy_cmap_cache;
  
    // CFF
    bool has_seac;
    const CFF::cff_subset_accelerator_t* cff_accelerator;
    hb_destroy_func_t destroy_cff_accelerator;
  
    // TODO(garretrieger): cumulative glyf checksum map
  
    bool in_error () const
    {
      return unicode_to_gid.in_error () ||
  	   gid_to_unicodes.in_error () ||
  	   unicodes.in_error () ||
  	   sanitized_table_cache.in_error ();
    }
  };
  
  
  #endif /* HB_SUBSET_ACCELERATOR_HH */
  

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