ftcache.c

ucgui的矢量字库支持包,可以象windows一样使用truetype的字库了

          /* now finalize it */
          manager->cur_weight -= cache->clazz.node_weight( node, cache );

          cache->clazz.node_free( node, cache );
          node = next;
        }
        cache->buckets[i] = NULL;
      }
      ftc_cache_resize( cache );
    }
  }


  FT_LOCAL_DEF( void )
  ftc_cache_done( FTC_Cache  cache )
  {
    if ( cache->memory )
    {
      FT_Memory  memory = cache->memory;


      FTC_Cache_Clear( cache );

      FT_FREE( cache->buckets );
      cache->mask  = 0;
      cache->p     = 0;
      cache->slack = 0;

      cache->memory = NULL;
    }
  }


  FT_LOCAL_DEF( void )
  FTC_Cache_Done( FTC_Cache  cache )
  {
    ftc_cache_done( cache );
  }


  static void
  ftc_cache_add( FTC_Cache  cache,
                 FT_UInt32  hash,
                 FTC_Node   node )
  {
    node->hash = hash;
    node->cache_index = (FT_UInt16) cache->index;
    node->ref_count   = 0;

    ftc_node_hash_link( node, cache );
    ftc_node_mru_link( node, cache->manager );

    {
      FTC_Manager  manager = cache->manager;


      manager->cur_weight += cache->clazz.node_weight( node, cache );

      if ( manager->cur_weight >= manager->max_weight )
      {
        node->ref_count++;
        FTC_Manager_Compress( manager );
        node->ref_count--;
      }
    }
  }


  FT_LOCAL_DEF( FT_Error )
  FTC_Cache_NewNode( FTC_Cache   cache,
                     FT_UInt32   hash,
                     FT_Pointer  query,
                     FTC_Node   *anode )
  {
    FT_Error  error;
    FTC_Node  node;


    /*
     * We use the FTC_CACHE_TRYLOOP macros to support out-of-memory
     * errors (OOM) correctly, i.e., by flushing the cache progressively
     * in order to make more room.
     */

    FTC_CACHE_TRYLOOP( cache )
    {
      error = cache->clazz.node_new( &node, query, cache );
    }
    FTC_CACHE_TRYLOOP_END();

    if ( error )
      node = NULL;
    else
    {
     /* don't assume that the cache has the same number of buckets, since
      * our allocation request might have triggered global cache flushing
      */
      ftc_cache_add( cache, hash, node );
    }

    *anode = node;
    return error;
  }


#ifndef FTC_INLINE

  FT_LOCAL_DEF( FT_Error )
  FTC_Cache_Lookup( FTC_Cache   cache,
                    FT_UInt32   hash,
                    FT_Pointer  query,
                    FTC_Node   *anode )
  {
    FT_UFast   idx;
    FTC_Node*  bucket;
    FTC_Node*  pnode;
    FTC_Node   node;
    FT_Error   error = 0;

    FTC_Node_CompareFunc  compare = cache->clazz.node_compare;


    if ( cache == NULL || anode == NULL )
      return FT_Err_Invalid_Argument;

    idx = hash & cache->mask;
    if ( idx < cache->p )
      idx = hash & ( cache->mask * 2 + 1 );

    bucket = cache->buckets + idx;
    pnode  = bucket;
    for (;;)
    {
      node = *pnode;
      if ( node == NULL )
        goto NewNode;

      if ( node->hash == hash && compare( node, query, cache ) )
        break;

      pnode = &node->link;
    }

    if ( node != *bucket )
    {
      *pnode     = node->link;
      node->link = *bucket;
      *bucket    = node;
    }

    /* move to head of MRU list */
    {
      FTC_Manager  manager = cache->manager;


      if ( node != manager->nodes_list )
        ftc_node_mru_up( node, manager );
    }
    *anode = node;
    return error;

  NewNode:
    return FTC_Cache_NewNode( cache, hash, query, anode );
  }

#endif /* !FTC_INLINE */


  FT_LOCAL_DEF( void )
  FTC_Cache_RemoveFaceID( FTC_Cache   cache,
                          FTC_FaceID  face_id )
  {
    FT_UFast     i, count;
    FTC_Manager  manager = cache->manager;
    FTC_Node     frees   = NULL;


    count = cache->p + cache->mask;
    for ( i = 0; i < count; i++ )
    {
      FTC_Node*  bucket = cache->buckets + i;
      FTC_Node*  pnode  = bucket;


      for ( ;; )
      {
        FTC_Node  node = *pnode;


        if ( node == NULL )
          break;

        if ( cache->clazz.node_remove_faceid( node, face_id, cache ) )
        {
          *pnode     = node->link;
          node->link = frees;
          frees      = node;
        }
        else
          pnode = &node->link;
      }
    }

    /* remove all nodes in the free list */
    while ( frees )
    {
      FTC_Node  node;


      node  = frees;
      frees = node->link;

      manager->cur_weight -= cache->clazz.node_weight( node, cache );
      ftc_node_mru_unlink( node, manager );

      cache->clazz.node_free( node, cache );

      cache->slack++;
    }

    ftc_cache_resize( cache );
  }


/* END */

/***************************************************************************/
/*                                                                         */
/*  ftccmap.c                                                              */
/*                                                                         */
/*    FreeType CharMap cache (body)                                        */
/*                                                                         */
/*  Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006 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.                                        */
/*                                                                         */
/***************************************************************************/


#include "ft2build.h"
#include FT_FREETYPE_H
#include FT_CACHE_H
#include "ftcmanag.h"
#include FT_INTERNAL_MEMORY_H
#include FT_INTERNAL_DEBUG_H
#include FT_TRUETYPE_IDS_H

#include "ftccback.h"
#include "ftcerror.h"

#undef  FT_COMPONENT
#define FT_COMPONENT  trace_cache


#ifdef FT_CONFIG_OPTION_OLD_INTERNALS

  typedef enum  FTC_OldCMapType_
  {
    FTC_OLD_CMAP_BY_INDEX    = 0,
    FTC_OLD_CMAP_BY_ENCODING = 1,
    FTC_OLD_CMAP_BY_ID       = 2

  } FTC_OldCMapType;


  typedef struct  FTC_OldCMapIdRec_
  {
    FT_UInt  platform;
    FT_UInt  encoding;

  } FTC_OldCMapIdRec, *FTC_OldCMapId;


  typedef struct  FTC_OldCMapDescRec_
  {
    FTC_FaceID       face_id;
    FTC_OldCMapType  type;

    union
    {
      FT_UInt           index;
      FT_Encoding       encoding;
      FTC_OldCMapIdRec  id;

    } u;

  } FTC_OldCMapDescRec, *FTC_OldCMapDesc;

#endif /* FT_CONFIG_OLD_INTERNALS */


  /*************************************************************************/
  /*                                                                       */
  /* Each FTC_CMapNode contains a simple array to map a range of character */
  /* codes to equivalent glyph indices.                                    */
  /*                                                                       */
  /* For now, the implementation is very basic: Each node maps a range of  */
  /* 128 consecutive character codes to their corresponding glyph indices. */
  /*                                                                       */
  /* We could do more complex things, but I don't think it is really very  */
  /* useful.                                                               */
  /*                                                                       */
  /*************************************************************************/


  /* number of glyph indices / character code per node */
#define FTC_CMAP_INDICES_MAX  128

  /* compute a query/node hash */
#define FTC_CMAP_HASH( faceid, index, charcode )           \
          ( FTC_FACE_ID_HASH( faceid ) + 211 * ( index ) + \
            ( (char_code) / FTC_CMAP_INDICES_MAX )       )

  /* the charmap query */
  typedef struct  FTC_CMapQueryRec_
  {
    FTC_FaceID  face_id;
    FT_UInt     cmap_index;
    FT_UInt32   char_code;

  } FTC_CMapQueryRec, *FTC_CMapQuery;

#define FTC_CMAP_QUERY( x )  ((FTC_CMapQuery)(x))
#define FTC_CMAP_QUERY_HASH( x )                                         \
          FTC_CMAP_HASH( (x)->face_id, (x)->cmap_index, (x)->char_code )

  /* the cmap cache node */
  typedef struct  FTC_CMapNodeRec_
  {
    FTC_NodeRec  node;
    FTC_FaceID   face_id;
    FT_UInt      cmap_index;
    FT_UInt32    first;                         /* first character in node */
    FT_UInt16    indices[FTC_CMAP_INDICES_MAX]; /* array of glyph indices  */

  } FTC_CMapNodeRec, *FTC_CMapNode;

#define FTC_CMAP_NODE( x ) ( (FTC_CMapNode)( x ) )
#define FTC_CMAP_NODE_HASH( x )                                      \
          FTC_CMAP_HASH( (x)->face_id, (x)->cmap_index, (x)->first )

  /* if (indices[n] == FTC_CMAP_UNKNOWN), we assume that the corresponding */
  /* glyph indices haven't been queried through FT_Get_Glyph_Index() yet   */
#define FTC_CMAP_UNKNOWN  ( (FT_UInt16)-1 )


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                        CHARMAP NODES                          *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  FT_CALLBACK_DEF( void )
  ftc_cmap_node_free( FTC_Node   ftcnode,
                      FTC_Cache  cache )
  {
    FTC_CMapNode  node   = (FTC_CMapNode)ftcnode;
    FT_Memory     memory = cache->memory;


    FT_FREE( node );
  }


  /* initialize a new cmap node */
  FT_CALLBACK_DEF( FT_Error )
  ftc_cmap_node_new( FTC_Node   *ftcanode,
                     FT_Pointer  ftcquery,
                     FTC_Cache   cache )
  {
    FTC_CMapNode  *anode  = (FTC_CMapNode*)ftcanode;
    FTC_CMapQuery  query  = (FTC_CMapQuery)ftcquery;
    FT_Error       error;
    FT_Memory      memory = cache->memory;
    FTC_CMapNode   node;
    FT_UInt        nn;


    if ( !FT_NEW( node ) )
    {
      node->face_id    = query->face_id;
      node->cmap_index = query->cmap_index;
      node->first      = (query->char_code / FTC_CMAP_INDICES_MAX) *
                         FTC_CMAP_INDICES_MAX;

      for ( nn = 0; nn < FTC_CMAP_INDICES_MAX; nn++ )
        node->indices[nn] = FTC_CMAP_UNKNOWN;
    }

    *anode = node;
    return error;
  }


  /* compute the weight of a given cmap node */
  FT_CALLBACK_DEF( FT_ULong )
  ftc_cmap_node_weight( FTC_Node   cnode,
                        FTC_Cache  cache )
  {
    FT_UNUSED( cnode );
    FT_UNUSED( cache );

    return sizeof ( *cnode );
  }


  /* compare a cmap node to a given query */
  FT_CALLBACK_DEF( FT_Bool )
  ftc_cmap_node_compare( FTC_Node    ftcnode,
                         FT_Pointer  ftcquery,
                         FTC_Cache   cache )
  {
    FTC_CMapNode   node  = (FTC_CMapNode)ftcnode;
    FTC_CMapQuery  query = (FTC_CMapQuery)ftcquery;
    FT_UNUSED( cache );


    if ( node->face_id    == query->face_id    &&
         node->cmap_index == query->cmap_index )
    {
      FT_UInt32  offset = (FT_UInt32)( query->char_code - node->first );


      return FT_BOOL( offset < FTC_CMAP_INDICES_MAX );
    }

    return 0;
  }


  FT_CALLBACK_DEF( FT_Bool )
  ftc_cmap_node_remove_faceid( FTC_Node    ftcnode,
                               FT_Pointer  ftcface_id,
                               FTC_Cache   cache )
  {
    FTC_CMapNode  node    = (FTC_CMapNode)ftcnode;
    FTC_FaceID    face_id = (FTC_FaceID)ftcface_id;
    FT_UNUSED( cache );

    return FT_BOOL( node->face_id == face_id );
  }


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                    GLYPH IMAGE CACHE                          *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/


  FT_CALLBACK_TABLE_DEF
  const FTC_CacheClassRec  ftc_cmap_cache_class =
  {
    ftc_cmap_node_new,
    ftc_cmap_node_weight,
    ftc_cmap_node_compare,
    ftc_cmap_node_remove_faceid,
    ftc_cmap_node_free,

    sizeof ( FTC_CacheRec ),
    ftc_cache_init,
    ftc_cache_done,
  };


  /* documentation is in ftcache.h */

  FT_EXPORT_DEF( FT_Error )
  FTC_CMapCache_New( FTC_Manager     manager,
                     FTC_CMapCache  *acache )
  {
    return FTC_Manager_RegisterCache( manager,
                                      &ftc_cmap_cache_class,
                                      FTC_CACHE_P( acache ) );
  }


#ifdef FT_CONFIG_OPTION_OLD_INTERNALS

  /*
   *  Unfortunately, it is not possible to support binary backwards