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/***************************************************************************/
/* */
/* ftcchunk.h */
/* */
/* FreeType chunk cache (specification). */
/* */
/* Copyright 2000-2001 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. */
/* */
/***************************************************************************/
/*************************************************************************/
/* */
/* Important: The functions defined in this file are only used to */
/* implement an abstract chunk cache class. You need to */
/* provide additional logic to implement a complete cache. */
/* For example, see `ftcmetrx.h' and `ftcmetrx.c' which */
/* implement a glyph metrics cache based on this code. */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/********* *********/
/********* WARNING, THIS IS BETA CODE. *********/
/********* *********/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#ifndef __FTCCHUNK_H__
#define __FTCCHUNK_H__
#include <ft2build.h>
#include FT_CACHE_H
#include FT_CACHE_MANAGER_H
FT_BEGIN_HEADER
/* maximum number of chunk sets in a given chunk cache */
#define FTC_MAX_CHUNK_SETS 16
typedef struct FTC_ChunkNodeRec_* FTC_ChunkNode;
typedef struct FTC_ChunkSetRec_* FTC_ChunkSet;
typedef struct FTC_ChunkCacheRec_* FTC_ChunkCache;
typedef struct FTC_ChunkNodeRec_
{
FTC_NodeRec node;
FTC_ChunkSet cset;
FT_UShort item_count;
FT_UShort item_start;
FT_Byte* items;
} FTC_ChunkNodeRec;
#define FTC_CHUNK_NODE(x) ((FTC_ChunkNode)(x))
/* a chunk set is used to categorize chunks of a given type */
typedef struct FTC_ChunkSetRec_
{
FT_LruNodeRec lru;
FT_UFast hash;
FTC_ChunkCache ccache;
FT_Fast num_chunks;
FT_UInt item_total; /* total number of glyphs in set */
FT_UInt item_size; /* size of each glyph item in set */
FT_UInt item_count; /* number of glyph items per chunk */
} FTC_ChunkSetRec;
#define FTC_CHUNK_SET(x) ((FTC_ChunkSet)(x))
#define FTC_CHUNK_SET_MEMORY(x) ((x)->ccache->cache.memory)
/* the abstract chunk cache class */
typedef struct FTC_ChunkCacheRec_
{
FTC_CacheRec cache;
FT_LruList cset_lru; /* LRU list of chunk sets */
} FTC_ChunkCacheRec;
#define FTC_CHUNK_CACHE(x) ((FTC_ChunkCache)(x))
typedef struct FTC_ChunkQueryRec_
{
/* input */
FT_UInt gindex; /* glyph index */
/* output */
FTC_ChunkSet cset;
} FTC_ChunkQueryRec, *FTC_ChunkQuery;
/*************************************************************************/
/* */
/* These functions are exported so that they can be called from */
/* user-provided cache classes; otherwise, they are really part of the */
/* cache sub-system internals. */
/* */
FT_EXPORT( FT_Error )
ftc_chunk_node_init( FTC_ChunkNode node,
FTC_ChunkSet cset,
FT_UInt index,
FT_Bool alloc );
/* chunk set objects */
FT_EXPORT( void )
ftc_chunk_node_done( FTC_ChunkNode node );
FT_EXPORT( FT_Error )
ftc_chunk_set_init( FTC_ChunkSet cset,
FT_UInt item_size,
FT_UInt item_count,
FT_UInt item_total,
FTC_ChunkCache cache );
FT_EXPORT( void )
ftc_chunk_set_done( FTC_ChunkSet cset );
/* chunk cache objects */
FT_EXPORT( FT_Error )
ftc_chunk_cache_init( FTC_ChunkCache cache,
FT_LruList_Class cset_class );
FT_EXPORT( void )
ftc_chunk_cache_done( FTC_ChunkCache cache );
FT_EXPORT( FT_Error )
ftc_chunk_cache_lookup( FTC_ChunkCache cache,
FTC_ChunkQuery query,
FTC_ChunkNode *anode );
/* */
FT_END_HEADER
#endif /* __FTCCHUNK_H__ */
/* END */
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