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

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• Author : Behdad Esfahbod
  Date : 2021-09-14 07:09:54
  Hash : ed116320
  Message : Call atexit() via hb_atexit() Part of https://github.com/harfbuzz/harfbuzz/issues/3197

• src/hb-shaper.cc

• /*
   * Copyright © 2012  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-shaper.hh"
  #include "hb-machinery.hh"
  
  
  static const hb_shaper_entry_t all_shapers[] = {
  #define HB_SHAPER_IMPLEMENT(name) {#name, _hb_##name##_shape},
  #include "hb-shaper-list.hh"
  #undef HB_SHAPER_IMPLEMENT
  };
  #ifndef HB_NO_SHAPER
  static_assert (0 != ARRAY_LENGTH_CONST (all_shapers), "No shaper enabled.");
  #endif
  
  static inline void free_static_shapers ();
  
  static struct hb_shapers_lazy_loader_t : hb_lazy_loader_t<const hb_shaper_entry_t,
  							  hb_shapers_lazy_loader_t>
  {
    static hb_shaper_entry_t *create ()
    {
      char *env = getenv ("HB_SHAPER_LIST");
      if (!env || !*env)
        return nullptr;
  
      hb_shaper_entry_t *shapers = (hb_shaper_entry_t *) hb_calloc (1, sizeof (all_shapers));
      if (unlikely (!shapers))
        return nullptr;
  
      memcpy (shapers, all_shapers, sizeof (all_shapers));
  
       /* Reorder shaper list to prefer requested shapers. */
      unsigned int i = 0;
      char *end, *p = env;
      for (;;)
      {
        end = strchr (p, ',');
        if (!end)
  	end = p + strlen (p);
  
        for (unsigned int j = i; j < ARRAY_LENGTH (all_shapers); j++)
  	if (end - p == (int) strlen (shapers[j].name) &&
  	    0 == strncmp (shapers[j].name, p, end - p))
  	{
  	  /* Reorder this shaper to position i */
  	 struct hb_shaper_entry_t t = shapers[j];
  	 memmove (&shapers[i + 1], &shapers[i], sizeof (shapers[i]) * (j - i));
  	 shapers[i] = t;
  	 i++;
  	}
  
        if (!*end)
  	break;
        else
  	p = end + 1;
      }
  
      hb_atexit (free_static_shapers);
  
      return shapers;
    }
    static void destroy (const hb_shaper_entry_t *p) { hb_free ((void *) p); }
    static const hb_shaper_entry_t *get_null ()      { return all_shapers; }
  } static_shapers;
  
  static inline
  void free_static_shapers ()
  {
    static_shapers.free_instance ();
  }
  
  const hb_shaper_entry_t *
  _hb_shapers_get ()
  {
    return static_shapers.get_unconst ();
  }