ref: f214137fbbec3e674df8e2aec8b7bab2d226f847
dir: /src/cache/ftcglyph.c/
/***************************************************************************/
/* */
/* ftcglyph.c */
/* */
/* FreeType Glyph Image (FT_Glyph) 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/ftlist.h>
#include <freetype/internal/ftobjs.h>
#include <freetype/internal/ftdebug.h>
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GLYPH NODES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* create a new glyph node, setting its cache index and ref count */
FT_EXPORT_DEF( void ) FTC_GlyphNode_Init( FTC_GlyphNode node,
FTC_GlyphSet gset,
FT_UInt gindex )
{
FTC_Glyph_Cache cache = gset->cache;
FTC_CacheNode_Data* data = FTC_CACHENODE_TO_DATA_P( &node->root );
data->cache_index = (FT_UShort)cache->root.cache_index;
data->ref_count = (FT_Short) 0;
node->gset_index = (FT_UShort)gset->gset_index;
node->glyph_index = (FT_UShort)gindex;
}
/* Important: This function is called from the cache manager to */
/* destroy a given cache node during `cache compression'. The */
/* second argument is always `cache.cache_data'. Thus be */
/* certain that the function FTC_Glyph_Cache_New() does indeed */
/* set its `cache_data' field correctly, otherwise bad things */
/* will happen! */
FT_EXPORT_DEF( void ) FTC_GlyphNode_Destroy( FTC_GlyphNode node,
FTC_Glyph_Cache cache )
{
FT_LruNode gset_lru = cache->gsets_lru->nodes + node->gset_index;
FTC_GlyphSet gset = (FTC_GlyphSet)gset_lru->root.data;
FT_UInt hash = node->glyph_index % gset->hash_size;
/* remove the node from its gset's bucket list */
{
FTC_GlyphNode* pnode = gset->buckets + hash;
FTC_GlyphNode cur;
for (;;)
{
cur = *pnode;
if ( !cur )
{
/* this should never happen */
FT_ERROR(( "FTC_GlyphNode_Destroy:"
" trying to delete an unlisted node!" ));
return;
}
if ( cur == node )
{
*pnode = cur->gset_next;
break;
}
pnode = &cur->gset_next;
}
}
/* destroy the node */
gset->clazz->destroy_node( node, gset );
}
/* Important: This function is called from the cache manager to */
/* size a given cache node during `cache compression'. The */
/* second argument is always `cache.user_data'. Thus be */
/* certain that the function FTC_Glyph_Cache_New() does indeed */
/* set its `user_data' field correctly, otherwise bad things */
/* will happen! */
FT_EXPORT_DEF( FT_ULong ) FTC_GlyphNode_Size( FTC_GlyphNode node,
FTC_Glyph_Cache cache )
{
FT_LruNode gset_lru = cache->gsets_lru->nodes + node->gset_index;
FTC_GlyphSet gset = (FTC_GlyphSet)gset_lru->root.data;
return gset->clazz->size_node( node, gset );
}
FT_CALLBACK_TABLE_DEF
const FTC_CacheNode_Class ftc_glyph_cache_node_class =
{
(FTC_CacheNode_SizeFunc) FTC_GlyphNode_Size,
(FTC_CacheNode_DestroyFunc)FTC_GlyphNode_Destroy
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GLYPH SETS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_EXPORT_DEF( FT_Error ) FTC_GlyphSet_New( FTC_Glyph_Cache cache,
FT_Pointer type,
FTC_GlyphSet *aset )
{
FT_Error error;
FT_Memory memory = cache->root.memory;
FTC_Manager manager = cache->root.manager;
FTC_GlyphSet gset = 0;
FTC_Glyph_Cache_Class* gcache_class;
FTC_GlyphSet_Class* clazz;
gcache_class = (FTC_Glyph_Cache_Class*)cache->root.clazz;
clazz = gcache_class->gset_class;
*aset = 0;
if ( ALLOC( gset, clazz->gset_byte_size ) )
goto Exit;
gset->cache = cache;
gset->manager = manager;
gset->memory = memory;
gset->hash_size = FTC_GSET_HASH_SIZE_DEFAULT;
gset->clazz = clazz;
/* allocate buckets table */
if ( ALLOC_ARRAY( gset->buckets, gset->hash_size, FTC_GlyphNode ) )
goto Exit;
/* initialize gset by type if needed */
if ( clazz->init )
{
error = clazz->init( gset, type );
if ( error )
goto Exit;
}
*aset = gset;
Exit:
if ( error && gset )
{
FREE( gset->buckets );
FREE( gset );
}
return error;
}
FT_EXPORT_DEF( void ) FTC_GlyphSet_Destroy( FTC_GlyphSet gset )
{
FTC_Glyph_Cache cache = gset->cache;
FTC_Manager manager = cache->root.manager;
FT_List glyphs_lru = &manager->global_lru;
FTC_GlyphNode* bucket = gset->buckets;
FTC_GlyphNode* bucket_limit = bucket + gset->hash_size;
FT_Memory memory = cache->root.memory;
FTC_GlyphSet_Class* clazz = gset->clazz;
/* for each bucket, free the list of glyph nodes */
for ( ; bucket < bucket_limit; bucket++ )
{
FTC_GlyphNode node = bucket[0];
FTC_GlyphNode next = 0;
FT_ListNode lrunode;
for ( ; node; node = next )
{
next = node->gset_next;
lrunode = FTC_GLYPHNODE_TO_LRUNODE( node );
manager->num_bytes -= clazz->size_node( node, gset );
manager->num_nodes--;
FT_List_Remove( glyphs_lru, lrunode );
clazz->destroy_node( node, gset );
}
bucket[0] = 0;
}
if ( clazz->done )
clazz->done( gset );
FREE( gset->buckets );
FREE( gset );
}
FT_EXPORT_DEF( FT_Error ) FTC_GlyphSet_Lookup_Node(
FTC_GlyphSet gset,
FT_UInt glyph_index,
FTC_GlyphNode *anode )
{
FTC_Glyph_Cache cache = gset->cache;
FTC_Manager manager = cache->root.manager;
FT_UInt hash_index = glyph_index % gset->hash_size;
FTC_GlyphNode* bucket = gset->buckets + hash_index;
FTC_GlyphNode* pnode = bucket;
FTC_GlyphNode node;
FT_Error error;
FTC_GlyphSet_Class* clazz = gset->clazz;
*anode = 0;
for ( ;; )
{
node = *pnode;
if ( !node )
break;
if ( node->glyph_index == glyph_index )
{
/* we found it! -- move glyph to start of the lists */
*pnode = node->gset_next;
node->gset_next = bucket[0];
bucket[0] = node;
FT_List_Up( &manager->global_lru, FTC_GLYPHNODE_TO_LRUNODE( node ) );
*anode = node;
return 0;
}
/* go to next node in bucket */
pnode = &node->gset_next;
}
/* we didn't found the glyph image, we will now create a new one */
error = clazz->new_node( gset, glyph_index, &node );
if ( error )
goto Exit;
/* insert the node at the start of our bucket list */
node->gset_next = bucket[0];
bucket[0] = node;
/* insert the node at the start the global LRU glyph list */
FT_List_Insert( &manager->global_lru, FTC_GLYPHNODE_TO_LRUNODE( node ) );
manager->num_bytes += clazz->size_node( node, gset );
manager->num_nodes++;
if ( manager->num_bytes > manager->max_bytes )
{
FTC_GlyphNode_Ref ( node );
FTC_Manager_Compress( manager );
FTC_GlyphNode_Unref ( node );
}
*anode = node;
Exit:
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GLYPH SETS LRU CALLBACKS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#define FTC_GSET_LRU_GET_CACHE( lru ) \
( (FTC_Glyph_Cache)(lru)->user_data )
#define FTC_GSET_LRU_GET_MANAGER( lru ) \
FTC_GSET_LRU_GET_CACHE( lru )->manager
#define FTC_LRUNODE_GSET( node ) \
( (FTC_GlyphSet)(node)->root.data )
FT_CALLBACK_DEF
FT_Error ftc_glyph_set_lru_init( FT_Lru lru,
FT_LruNode node )
{
FTC_Glyph_Cache cache = FTC_GSET_LRU_GET_CACHE( lru );
FT_Error error;
FTC_GlyphSet gset;
error = FTC_GlyphSet_New( cache, (FT_Pointer)node->key, &gset );
if ( !error )
{
/* good, now set the gset index within the gset object */
gset->gset_index = node - lru->nodes;
node->root.data = gset;
}
return error;
}
FT_CALLBACK_DEF
void ftc_glyph_set_lru_done( FT_Lru lru,
FT_LruNode node )
{
FTC_GlyphSet gset = FTC_LRUNODE_GSET( node );
FT_UNUSED( lru );
FTC_GlyphSet_Destroy( gset );
}
FT_CALLBACK_DEF
FT_Bool ftc_glyph_set_lru_compare( FT_LruNode node,
FT_LruKey key )
{
FTC_GlyphSet gset = FTC_LRUNODE_GSET( node );
return gset->clazz->compare( gset, (FT_Pointer)key );
}
FT_CALLBACK_TABLE_DEF
const FT_Lru_Class ftc_glyph_set_lru_class =
{
sizeof( FT_LruRec ),
ftc_glyph_set_lru_init,
ftc_glyph_set_lru_done,
0, /* no flush */
ftc_glyph_set_lru_compare
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GLYPH CACHE OBJECTS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_EXPORT_DEF( FT_Error ) FTC_Glyph_Cache_Init( FTC_Glyph_Cache cache )
{
FT_Memory memory = cache->root.memory;
FT_Error error;
FTC_Glyph_Cache_Class* gcache_clazz;
/* set up root node_class to be used by manager */
cache->root.node_clazz =
(FTC_CacheNode_Class*)&ftc_glyph_cache_node_class;
/* setup the `compare' shortcut */
gcache_clazz = (FTC_Glyph_Cache_Class*)cache->root.clazz;
cache->compare = gcache_clazz->gset_class->compare;
/* 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 `cache_data' and must be set to */
/* `cache' here. */
/* */
cache->root.cache_data = cache;
error = FT_Lru_New( &ftc_glyph_set_lru_class,
FTC_MAX_GLYPH_SETS,
cache,
memory,
1, /* pre_alloc == TRUE */
&cache->gsets_lru );
return error;
}
FT_EXPORT_DEF( void ) FTC_Glyph_Cache_Done( FTC_Glyph_Cache cache )
{
/* discard glyph sets */
FT_Lru_Done( cache->gsets_lru );
}
FT_EXPORT_DEF( FT_Error ) FTC_Glyph_Cache_Lookup( FTC_Glyph_Cache cache,
FT_Pointer type,
FT_UInt gindex,
FTC_GlyphNode *anode )
{
FT_Error error;
FTC_GlyphSet gset;
FTC_GlyphNode node;
FTC_Manager manager;
/* check for valid `desc' delayed to FT_Lru_Lookup() */
if ( !cache || !anode )
return FT_Err_Invalid_Argument;
*anode = 0;
gset = cache->last_gset;
if ( !gset || !cache->compare( gset, type ) )
{
error = FT_Lru_Lookup( cache->gsets_lru,
(FT_LruKey)type,
(FT_Pointer*)&gset );
cache->last_gset = gset;
if ( error )
goto Exit;
}
error = FTC_GlyphSet_Lookup_Node( gset, gindex, &node );
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_GlyphNode_Ref ( node );
FTC_Manager_Compress( manager );
FTC_GlyphNode_Unref ( node );
}
*anode = node;
Exit:
return error;
}
/* END */