ref: c8ad30a7a020966e2b4ea22465b00817330b607e
dir: /src/cache/ftcchunk.c/
/***************************************************************************/
/* */
/* ftcchunk.c */
/* */
/* FreeType chunk cache cache (body). */
/* */
/* 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. */
/* */
/***************************************************************************/
#include <ft2build.h>
#include FT_CACHE_H
#include FT_CACHE_INTERNAL_CHUNK_H
#include FT_LIST_H
#include FT_ERRORS_H
#include FT_INTERNAL_OBJECTS_H
#include "ftcerror.h"
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GLYPH NODES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#define FTC_CSET_CHUNK_INDEX( cset, gindex ) \
( (gindex) / (cset)->item_count )
#define FTC_CSET_START( cset, gindex ) \
( FTC_CSET_CHUNK_INDEX( cset, gindex ) * (cset)->item_count )
#define FTC_CSET_HASH( cset, gindex ) \
( (FT_UFast)( ( (cset)->hash << 16 ) | \
( FTC_CSET_CHUNK_INDEX( cset, gindex ) & 0xFFFF ) ) )
/* create a new chunk node, setting its cache index and ref count */
FT_EXPORT_DEF( FT_Error )
ftc_chunk_node_init( FTC_ChunkNode cnode,
FTC_ChunkSet cset,
FT_UInt gindex,
FT_Bool alloc )
{
FTC_ChunkCache ccache = cset->ccache;
FT_Error error = 0;
FT_UInt len;
FT_UInt start = FTC_CSET_START( cset, gindex );
cnode->cset = cset;
cnode->node.hash = FTC_CSET_HASH( cset, gindex );
cnode->item_start = start;
len = cset->item_total - start;
if ( len > cset->item_count )
len = cset->item_count;
cnode->item_count = len;
if ( alloc )
{
FT_Memory memory = ccache->cache.memory;
error = MEM_Alloc( cnode->items, cset->item_size * cnode->item_count );
}
if ( !error )
cset->num_chunks++;
return error;
}
FT_EXPORT_DEF( void )
ftc_chunk_node_done( FTC_ChunkNode cnode )
{
FTC_ChunkSet cset = cnode->cset;
FT_Memory memory = cset->ccache->cache.memory;
/* destroy the node */
FREE( cnode->items );
cnode->item_count = 0;
cnode->item_start = 0;
/* remove from parent set table -- eventually destroy the set */
if ( --cset->num_chunks <= 0 )
FT_LruList_Remove( cset->ccache->cset_lru, (FT_LruNode)cset );
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** CHUNK SETS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_EXPORT_DEF( FT_Error )
ftc_chunk_set_init( FTC_ChunkSet cset,
FT_UInt item_size,
FT_UInt item_count,
FT_UInt item_total,
FTC_ChunkCache cache )
{
cset->ccache = cache;
cset->num_chunks = 0;
cset->item_total = item_total;
cset->item_size = item_size;
cset->item_count = item_count;
return 0;
}
FT_EXPORT_DEF( void )
ftc_chunk_set_done( FTC_ChunkSet cset )
{
/* nothing for now */
FT_UNUSED( cset );
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** CHUNK CACHES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_EXPORT_DEF( void )
ftc_chunk_cache_done( FTC_ChunkCache ccache )
{
ftc_cache_done( FTC_CACHE( ccache ) );
/* simply delete all remaining glyph sets */
if ( ccache->cset_lru )
{
FT_LruList_Destroy( ccache->cset_lru );
ccache->cset_lru = NULL;
}
}
FT_EXPORT_DEF( FT_Error )
ftc_chunk_cache_init( FTC_ChunkCache ccache,
FT_LruList_Class cset_class )
{
FT_Error error;
error = ftc_cache_init( FTC_CACHE( ccache ) );
if ( error )
goto Exit;
error = FT_LruList_New( cset_class, 0, ccache,
ccache->cache.memory,
&ccache->cset_lru );
Exit:
return error;
}
FT_EXPORT_DEF( FT_Error )
ftc_chunk_cache_lookup( FTC_ChunkCache ccache,
FTC_ChunkQuery query,
FTC_ChunkNode *anode )
{
FT_LruNode node;
FT_Error error;
error = FT_LruList_Lookup( ccache->cset_lru, query, &node );
if ( !error )
{
FTC_ChunkSet cset = FTC_CHUNK_SET( node );
FT_UFast hash = FTC_CSET_HASH( cset, query->gindex );
error = ftc_cache_lookup_node( FTC_CACHE( ccache ), hash, query,
FTC_NODE_P( anode ) );
}
return error;
}
/* END */