ref: c3b21608699a72698d382ad44c5f9fd6946ce43c
dir: /src/cache/ftcglyph.c/
/***************************************************************************/
/* */
/* ftcglyph.c */
/* */
/* FreeType Glyph Image (FT_Glyph) 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_GLYPH_H
#include FT_ERRORS_H
#include FT_LIST_H
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_DEBUG_H
#include "ftcerror.h"
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GLYPH NODES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#define FTC_GSET_HASH( gset, gindex ) \
( (FT_UFast)( ( (gset)->hash << 16 ) | ( (gindex) & 0xFFFF ) ) )
/* create a new glyph node, setting its cache index and ref count */
FT_EXPORT_DEF( void )
ftc_glyph_node_init( FTC_GlyphNode gnode,
FT_UInt gindex,
FTC_GlyphSet gset )
{
gnode->gset = gset;
gnode->node.hash = FTC_GSET_HASH( gset, gindex );
gset->num_glyphs++;
}
/* 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_glyph_node_done( FTC_GlyphNode gnode )
{
FTC_GlyphSet gset = gnode->gset;
if ( --gset->num_glyphs <= 0 )
FT_LruList_Remove( gset->gcache->gset_lru, (FT_LruNode)gset );
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GLYPH SETS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_EXPORT_DEF( FT_Error )
ftc_glyph_set_init( FTC_GlyphSet gset,
FT_LruList lru )
{
FTC_GlyphCache gcache = lru->user_data;
gset->gcache = gcache;
gset->num_glyphs = 0;
return 0;
}
FT_EXPORT_DEF( void )
ftc_glyph_set_done( FTC_GlyphSet gset )
{
/* for now, nothing to be done here */
FT_UNUSED( gset );
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GLYPH CACHES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_EXPORT_DEF( void )
ftc_glyph_cache_done( FTC_GlyphCache gcache )
{
/* remove all nodes in the cache */
ftc_cache_done( &gcache->cache );
/* simply delete all remaining glyph sets */
if ( gcache->gset_lru )
{
FT_LruList_Destroy( gcache->gset_lru );
gcache->gset_lru = NULL;
}
}
FT_EXPORT_DEF( FT_Error )
ftc_glyph_cache_init( FTC_GlyphCache gcache,
FT_LruList_Class gset_class )
{
FT_Error error;
error = ftc_cache_init( FTC_CACHE( gcache ) );
if ( error )
goto Exit;
error = FT_LruList_New( gset_class, 0, gcache,
gcache->cache.memory,
&gcache->gset_lru );
Exit:
return error;
}
FT_EXPORT_DEF( FT_Error )
ftc_glyph_cache_lookup( FTC_GlyphCache gcache,
FTC_GlyphQuery query,
FTC_GlyphNode *anode )
{
FT_LruNode node;
FT_Error error;
error = FT_LruList_Lookup( gcache->gset_lru, query, &node );
if ( !error )
{
FTC_GlyphSet gset = (FTC_GlyphSet)node;
FT_UFast hash = FTC_GSET_HASH( gset, query->gindex );
error = ftc_cache_lookup_node( FTC_CACHE( gcache ), hash, query,
FTC_NODE_P( anode ) );
}
return error;
}
/* END */