ref: 170c0d4c0d009bc5c08434b46515238620a410bd
dir: /src/cache/ftcchunk.c/
/***************************************************************************/
/* */
/* ftcchunk.c */
/* */
/* FreeType chunk cache cache (body). */
/* */
/* Copyright 2000 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
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GLYPH NODES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* create a new chunk node, setting its cache index and ref count */
FT_EXPORT_DEF( FT_Error ) FTC_ChunkNode_Init( FTC_ChunkNode node,
FTC_ChunkSet cset,
FT_UInt index,
FT_Bool alloc )
{
FTC_Chunk_Cache cache = cset->cache;
FTC_CacheNode_Data* data = FTC_CACHENODE_TO_DATA_P( &node->root );
FT_Error error = 0;
data->cache_index = (FT_UShort)cache->root.cache_index;
data->ref_count = (FT_Short) 0;
node->cset = cset;
node->cset_index = (FT_UShort)index;
node->num_elements = ( index + 1 < cset->num_chunks )
? cset->element_count
: cset->element_max - cset->element_count*index;
if ( alloc )
{
/* allocate elements array */
FT_Memory memory;
memory = cache->root.memory;
error = MEM_Alloc( node->elements,
cset->element_size * cset->element_count );
}
return error;
}
FT_EXPORT_DEF( void ) FTC_ChunkNode_Destroy( FTC_ChunkNode node )
{
FTC_ChunkSet cset = node->cset;
/* remove from parent set table */
cset->chunks[node->cset_index] = 0;
/* destroy the node */
cset->clazz->destroy_node( node );
}
FT_EXPORT_DEF( FT_ULong ) FTC_ChunkNode_Size( FTC_ChunkNode node )
{
FTC_ChunkSet cset = node->cset;
return cset->clazz->size_node( node );
}
FT_CALLBACK_TABLE_DEF
const FTC_CacheNode_Class ftc_chunk_cache_node_class =
{
(FTC_CacheNode_SizeFunc) FTC_ChunkNode_Size,
(FTC_CacheNode_DestroyFunc)FTC_ChunkNode_Destroy
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** CHUNK SETS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_EXPORT_DEF( FT_Error ) FTC_ChunkSet_New( FTC_Chunk_Cache cache,
FT_Pointer type,
FTC_ChunkSet *aset )
{
FT_Error error;
FT_Memory memory = cache->root.memory;
FTC_Manager manager = cache->root.manager;
FTC_ChunkSet cset = 0;
FTC_Chunk_Cache_Class* ccache_class;
FTC_ChunkSet_Class* clazz;
ccache_class = (FTC_Chunk_Cache_Class*)cache->root.clazz;
clazz = ccache_class->cset_class;
*aset = 0;
if ( ALLOC( cset, clazz->cset_byte_size ) )
goto Exit;
cset->cache = cache;
cset->manager = manager;
cset->memory = memory;
cset->clazz = clazz;
/* now compute element_max, element_count and element_size */
error = clazz->sizes( cset, type );
if ( error )
goto Exit;
/* compute maximum number of nodes */
cset->num_chunks = ( cset->element_max + cset->element_count - 1 ) /
cset->element_count;
/* allocate chunk pointers table */
if ( ALLOC_ARRAY( cset->chunks, cset->num_chunks, FTC_ChunkNode ) )
goto Exit;
/* initialize set by type if needed */
if ( clazz->init )
{
error = clazz->init( cset, type );
if ( error )
goto Exit;
}
*aset = cset;
Exit:
if ( error && cset )
{
FREE( cset->chunks );
FREE( cset );
}
return error;
}
FT_EXPORT_DEF( void ) FTC_ChunkSet_Destroy( FTC_ChunkSet cset )
{
FTC_Chunk_Cache cache = cset->cache;
FTC_Manager manager = cache->root.manager;
FT_List glyphs_lru = &manager->global_lru;
FTC_ChunkNode* bucket = cset->chunks;
FTC_ChunkNode* bucket_limit = bucket + cset->num_chunks;
FT_Memory memory = cache->root.memory;
FTC_ChunkSet_Class* clazz = cset->clazz;
/* for each bucket, free the list of glyph nodes */
for ( ; bucket < bucket_limit; bucket++ )
{
FTC_ChunkNode node = bucket[0];
FT_ListNode lrunode;
if ( node )
{
lrunode = FTC_CHUNKNODE_TO_LRUNODE( node );
manager->num_bytes -= clazz->size_node( node );
manager->num_nodes--;
FT_List_Remove( glyphs_lru, lrunode );
clazz->destroy_node( node );
bucket[0] = 0;
}
}
if ( clazz->done )
clazz->done( cset );
FREE( cset->chunks );
FREE( cset );
}
FT_EXPORT_DEF( FT_Error ) FTC_ChunkSet_Lookup_Node(
FTC_ChunkSet cset,
FT_UInt glyph_index,
FTC_ChunkNode *anode,
FT_UInt *anindex )
{
FTC_Chunk_Cache cache = cset->cache;
FTC_Manager manager = cache->root.manager;
FT_Error error = 0;
FTC_ChunkSet_Class* clazz = cset->clazz;
*anode = 0;
if ( glyph_index >= cset->element_max )
error = FT_Err_Invalid_Argument;
else
{
FT_UInt chunk_size = cset->element_count;
FT_UInt chunk_index = glyph_index / chunk_size;
FTC_ChunkNode* pnode = cset->chunks + chunk_index;
FTC_ChunkNode node = *pnode;
if ( !node )
{
/* we didn't found the glyph image; we will now create a new one */
error = clazz->new_node( cset, chunk_index, &node );
if ( error )
goto Exit;
/* store the new chunk in the cset's table */
*pnode = node;
/* insert the node at the start the global LRU glyph list */
FT_List_Insert( &manager->global_lru,
FTC_CHUNKNODE_TO_LRUNODE( node ) );
manager->num_bytes += clazz->size_node( node );
manager->num_nodes++;
if ( manager->num_bytes > manager->max_bytes )
{
FTC_ChunkNode_Ref ( node );
FTC_Manager_Compress( manager );
FTC_ChunkNode_Unref ( node );
}
}
*anode = node;
*anindex = glyph_index - chunk_index * chunk_size;
}
Exit:
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** CHUNK SETS LRU CALLBACKS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#define FTC_CSET_LRU_GET_CACHE( lru ) \
( (FTC_Chunk_Cache)((lru)->user_data) )
#define FTC_CSET_LRU_GET_MANAGER( lru ) \
FTC_CSET_LRU_GET_CACHE( lru )->manager
#define FTC_LRUNODE_CSET( node ) \
( (FTC_ChunkSet)(node)->root.data )
FT_CALLBACK_DEF
FT_Error ftc_chunk_set_lru_init( FT_Lru lru,
FT_LruNode node )
{
FTC_Chunk_Cache cache = FTC_CSET_LRU_GET_CACHE( lru );
FT_Error error;
FTC_ChunkSet cset;
error = FTC_ChunkSet_New( cache,
(FT_Pointer)node->key,
&cset );
if ( !error )
{
/* good, now set the set index within the set object */
cset->cset_index = node - lru->nodes;
node->root.data = cset;
}
return error;
}
FT_CALLBACK_DEF
void ftc_chunk_set_lru_done( FT_Lru lru,
FT_LruNode node )
{
FTC_ChunkSet cset = FTC_LRUNODE_CSET( node );
FT_UNUSED( lru );
FTC_ChunkSet_Destroy( cset );
}
FT_CALLBACK_DEF
FT_Bool ftc_chunk_set_lru_compare( FT_LruNode node,
FT_LruKey key )
{
FTC_ChunkSet cset = FTC_LRUNODE_CSET( node );
return cset->clazz->compare( cset, (FT_Pointer)key );
}
FT_CALLBACK_TABLE_DEF
const FT_Lru_Class ftc_chunk_set_lru_class =
{
sizeof( FT_LruRec ),
ftc_chunk_set_lru_init,
ftc_chunk_set_lru_done,
0, /* no flush */
ftc_chunk_set_lru_compare
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** CHUNK CACHE OBJECTS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_EXPORT_DEF( FT_Error ) FTC_Chunk_Cache_Init( FTC_Chunk_Cache cache )
{
FT_Memory memory = cache->root.memory;
FT_Error error;
FTC_Chunk_Cache_Class* ccache_clazz;
/* set up root node_class to be used by manager */
cache->root.node_clazz =
(FTC_CacheNode_Class*)&ftc_chunk_cache_node_class;
/* setup `compare' shortcut */
ccache_clazz = (FTC_Chunk_Cache_Class*)cache->root.clazz;
cache->compare = ccache_clazz->cset_class->compare;
error = FT_Lru_New( &ftc_chunk_set_lru_class,
FTC_MAX_CHUNK_SETS,
cache,
memory,
1, /* pre_alloc == TRUE */
&cache->csets_lru );
return error;
}
FT_EXPORT_DEF( void ) FTC_Chunk_Cache_Done( FTC_Chunk_Cache cache )
{
/* discard glyph sets */
FT_Lru_Done( cache->csets_lru );
}
FT_EXPORT_DEF( FT_Error ) FTC_Chunk_Cache_Lookup( FTC_Chunk_Cache cache,
FT_Pointer type,
FT_UInt gindex,
FTC_ChunkNode *anode,
FT_UInt *aindex )
{
FT_Error error;
FTC_ChunkSet cset;
FTC_ChunkNode node;
FT_UInt cindex;
FTC_Manager manager;
/* check for valid `desc' delayed to FT_Lru_Lookup() */
if ( !cache || !anode || !aindex )
return FT_Err_Invalid_Argument;
*anode = 0;
*aindex = 0;
cset = cache->last_cset;
if ( !cset || !cache->compare( cset, type ) )
{
error = FT_Lru_Lookup( cache->csets_lru,
(FT_LruKey)type,
(FT_Pointer*)&cset );
cache->last_cset = cset;
if ( error )
goto Exit;
}
error = FTC_ChunkSet_Lookup_Node( cset, gindex, &node, &cindex );
if ( error )
goto Exit;
/* now compress the manager's cache pool if needed */
manager = cache->root.manager;
if ( manager->num_bytes > manager->max_bytes )
{
FTC_ChunkNode_Ref ( node );
FTC_Manager_Compress( manager );
FTC_ChunkNode_Unref ( node );
}
*anode = node;
*aindex = cindex;
Exit:
return error;
}
/* END */