ref: 1ea9378ad3e250473464fde4ab336607a958eab1
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 <freetype/cache/ftcglyph.h>
#include <freetype/fterrors.h>
#include <freetype/internal/ftobjs.h>
#include <freetype/internal/ftlist.h>
#include <freetype/fterrors.h>
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GLYPH NODES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* create a new chunk node, setting its cache index and ref count */
FT_EXPORT_FUNC( NV_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 );
NV_Error error = 0;
data->cache_index = (FT_UShort) cache->root.cache_index;
data->ref_count = (FT_Short) 0;
node->cset_index = (FT_UShort) index;
node->num_elements = (index+1 < cset->chunk_count)
? cset->chunk_size
: cset->element_max - cset->chunk_count*index;
if (alloc)
{
/* allocate elements array */
memory = cache->root.memory;
error = MEM_ALLOC( cache->elements, cset->element_size *
cset->element_count );
}
return error;
}
FT_EXPORT_FUNC( 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_FUNC( FT_ULong ) FTC_ChunkNode_Size( FTC_ChunkNode node )
{
FTC_ChunkSet cset = node->cset;
return cset->clazz->size_node( node, cset );
}
FT_CPLUSPLUS( 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_FUNC( FT_Error )
FTC_ChunkSet_New( FTC_Chunk_Cache cache,
FT_Pointer type,
FT_UInt num_elements,
FT_UInt element_size,
FT_UInt chunk_size,
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( set, clazz->cset_byte_size ) )
goto Exit;
cset->cache = cache;
cset->manager = manager;
cset->memory = memory;
cset->element_max = num_elements;
cset->element_size = element_size;
cset->element_count = chunk_size;
cset->clazz = clazz;
/* compute maximum number of nodes */
cset->num_chunks = (num_elements + (chunk_size-1))/chunk_size;
/* 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_FUNC( 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->chunk;
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;
lrunode = FTC_CHUNKNODE_TO_LRUNODE( node );
manager->num_bytes -= clazz->size_node( node );
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_FUNC( FT_Error )
FTC_ChunkSet_Lookup_Node( FTC_ChunkSet cset,
FT_UInt glyph_index,
FTC_ChunkNode *anode,
FTC_UInt *index )
{
FTC_Glyph_Cache cache = cset->cache;
FTC_Manager manager = cache->root.manager;
FT_Error error = 0;
FTC_GlyphSet_Class* clazz = cset->clazz;
*anode = 0;
if (glyph_index >= cset->elements_max)
error = FT_Err_Invalid_Argument;
else
{
FT_UInt chunk_size = cset->chunk_size;
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, glyph_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, gset );
if (manager->num_bytes > manager->max_bytes)
{
FTC_ChunkNode_Ref ( node );
FTC_Manager_Compress( manager );
FTC_ChunkNode_Unref ( node );
}
}
*anode = node;
*aindex = 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 )
LOCAL_FUNC_X
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 = set;
}
return error;
}
LOCAL_FUNC_X
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 );
}
LOCAL_FUNC_X
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_CPLUSPLUS( 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_FUNC( FT_Error ) FTC_Chunk_Cache_Init( FTC_Chunk_Cache cache )
{
FT_Memory memory = cache->root.memory;
FT_Error error;
/* set up root node_class to be used by manager */
cache->root.node_clazz =
(FTC_CacheNode_Class*)&ftc_chunk_cache_node_class;
/* The following is extremely important for ftc_destroy_glyph_image() */
/* to work properly, as the second parameter that is sent to it */
/* through the cache manager is `user_data' and must be set to */
/* `cache' here. */
/* */
cache->root.cache_user = cache;
error = FT_Lru_New( &ftc_chunk_set_lru_class,
FTC_MAX_GLYPH_CSETS,
cache,
memory,
1, /* pre_alloc == TRUE */
&cache->csets_lru );
return error;
}
FT_EXPORT_FUNC( void ) FTC_Chunk_Cache_Done( FTC_Chunk_Cache cache )
{
/* discard glyph sets */
FT_Lru_Done( cache->csets_lru );
}