kc3-lang/freetype/src/cache/ftccache.i

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• Hash : 8c90c22d
  Author :
  Date : 2002-06-08T06:47:18
  

  * src/cache/ftccache.c (ftc_node_hash_unlink, ftc_node_hash_link) [FTC_CACHE_USE_LINEAR_HASHING]: Fix returned error code. Fix debugging messages. * src/type42/t42error.h: New file. * src/type42/t42drivr.c, src/type42/t42objs.c, src/type42/t42parse.c: Use t42 error codes. * src/type42/rules.mk: Updated. * src/base/ftnames.c: Include FT_INTERNAL_STREAM_H. Formatting, adding copyright messages.

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• src/cache/ftccache.i

• /***************************************************************************/
  /*                                                                         */
  /*  ftccache.i                                                             */
  /*                                                                         */
  /*    FreeType template for generic cache.                                 */
  /*                                                                         */
  /*  Copyright 2002 by                                                      */
  /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  /*                                                                         */
  /*  This file is part of the FreeType project, and may only be used,       */
  /*  modified, and distributed under the terms of the FreeType project      */
  /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  /*  this file you indicate that you have read the license and              */
  /*  understand and accept it fully.                                        */
  /*                                                                         */
  /***************************************************************************/
  
  
  #ifndef GEN_CACHE_FAMILY_COMPARE
  #error "GEN_CACHE_FAMILY_COMPARE not defined in template instantiation"
  #endif
  
  #ifndef GEN_CACHE_NODE_COMPARE
  #error "GEN_CACHE_NODE_COMPARE not defined in template instantiation"
  #endif
  
  
    static FT_Error
    GEN_CACHE_LOOKUP( FTC_Cache   cache,
                      FTC_Query   query,
                      FTC_Node   *anode )
    {
      FT_LruNode  lru;
  
  
      query->hash   = 0;
      query->family = NULL;
  
      /* XXX: we break encapsulation for the sake of speed! */
      {
        /* first of all, find the relevant family */
        FT_LruList  list  = cache->families;
        FT_LruNode  fam, *pfam;
  
  
        pfam = &list->nodes;
        for (;;)
        {
          fam = *pfam;
          if ( fam == NULL )
            goto Normal;
  
          if ( GEN_CACHE_FAMILY_COMPARE( fam, query, list->data ) )
            break;
  
          pfam = &fam->next;
        }
  
        FT_ASSERT( fam != NULL );
  
        /* move to top of list when needed */
        if ( fam != list->nodes )
        {
          *pfam       = fam->next;
          fam->next   = list->nodes;
          list->nodes = fam;
        }
  
        lru = fam;
      }
  
      {
        FTC_Family  family = (FTC_Family) lru;
        FT_UFast    hash   = query->hash;
        FTC_Node    node, *pnode, *bucket;
  
  
  #ifdef FTC_CACHE_USE_LINEAR_HASHING
        FT_UInt  index;
  
  
        index = hash & cache->mask;
        if ( index < cache->p )
          index = hash & ( cache->mask * 2 + 1 );
  
        bucket  = cache->buckets + index;
  #else
        bucket  = cache->buckets + ( hash % cache->size );
  #endif
  
  #ifdef FT_DEBUG_LEVEL_ERROR
        if ( query->family     != family                        ||
             family->fam_index >= cache->manager->families.size )
        {
          FT_ERROR((
            "ftc_cache_lookup: invalid query (bad 'family' field)\n" ));
          return FTC_Err_Invalid_Argument;
        }
  #endif
  
        pnode = bucket;
  
        for ( ;; )
        {
          node = *pnode;
          if ( node == NULL )
            goto Normal;
  
          if ( node->hash == hash                            &&
               (FT_UInt)node->fam_index == family->fam_index &&
               GEN_CACHE_NODE_COMPARE( node, query, cache )  )
          {
            /* we place the following out of the loop to make it */
            /* as small as possible...                           */
            goto Found;
          }
  
          pnode = &node->link;
        }
  
    Normal:
        return ftc_cache_lookup( cache, query, anode );
  
    Found:
        /* move to head of bucket list */
        if ( pnode != bucket )
        {
          *pnode     = node->link;
          node->link = *bucket;
          *bucket    = node;
        }
  
        /* move to head of MRU list */
        if ( node != cache->manager->nodes_list )
        {
          /* XXX: again, this is an inlined version of ftc_node_mru_up */
          FTC_Manager  manager = cache->manager;
          FTC_Node     first   = manager->nodes_list;
          FTC_Node     prev = node->mru_prev;
          FTC_Node     next = node->mru_next;
          FTC_Node     last;
  
  
          prev->mru_next = next;
          next->mru_prev = prev;
  
          last            = first->mru_prev;
          node->mru_next  = first;
          node->mru_prev  = last;
          first->mru_prev = node;
          last->mru_next  = node;
  
          manager->nodes_list = node;
        }
  
        *anode = node;
        return 0;
      }
    }
  
  #undef GEN_CACHE_NODE_COMPARE
  #undef GEN_CACHE_FAMILY_COMPARE
  #undef GEN_CACHE_LOOKUP
  
  
  /* END */
  

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