170 lines
5.9 KiB
C
170 lines
5.9 KiB
C
/***************************************************************************/
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/* */
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/* ftcglyph.c */
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/* */
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/* FreeType Glyph Image (FT_Glyph) cache (body). */
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/* */
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/* Copyright 2000-2001 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_CACHE_H
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#include FT_CACHE_INTERNAL_GLYPH_H
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#include FT_ERRORS_H
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#include FT_LIST_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_INTERNAL_DEBUG_H
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#include "ftcerror.h"
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** GLYPH NODES *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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#define FTC_GSET_HASH( gset, gindex ) \
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( (FT_UFast)( ( (gset)->hash << 16 ) | ( (gindex) & 0xFFFF ) ) )
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/* create a new glyph node, setting its cache index and ref count */
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FT_EXPORT_DEF( void )
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ftc_glyph_node_init( FTC_GlyphNode gnode,
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FT_UInt gindex,
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FTC_GlyphSet gset )
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{
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gnode->gset = gset;
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gnode->node.hash = FTC_GSET_HASH( gset, gindex );
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gset->num_glyphs++;
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}
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/* Important: This function is called from the cache manager to */
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/* destroy a given cache node during `cache compression'. The */
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/* second argument is always `cache.cache_data'. Thus be */
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/* certain that the function FTC_Glyph_Cache_New() does indeed */
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/* set its `cache_data' field correctly, otherwise bad things */
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/* will happen! */
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FT_EXPORT_DEF( void )
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ftc_glyph_node_done( FTC_GlyphNode gnode )
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{
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FTC_GlyphSet gset = gnode->gset;
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if ( --gset->num_glyphs <= 0 )
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FT_LruList_Remove( gset->gcache->gset_lru, (FT_LruNode)gset );
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** GLYPH SETS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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FT_EXPORT_DEF( FT_Error )
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ftc_glyph_set_init( FTC_GlyphSet gset,
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FT_LruList lru )
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{
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FTC_GlyphCache gcache = lru->user_data;
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gset->gcache = gcache;
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gset->num_glyphs = 0;
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return 0;
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}
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FT_EXPORT_DEF( void )
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ftc_glyph_set_done( FTC_GlyphSet gset )
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{
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/* for now, nothing to be done here */
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FT_UNUSED( gset );
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** GLYPH CACHES *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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FT_EXPORT_DEF( void )
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ftc_glyph_cache_done( FTC_GlyphCache gcache )
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{
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/* remove all nodes in the cache */
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ftc_cache_done( &gcache->cache );
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/* simply delete all remaining glyph sets */
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if ( gcache->gset_lru )
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{
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FT_LruList_Destroy( gcache->gset_lru );
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gcache->gset_lru = NULL;
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}
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}
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FT_EXPORT_DEF( FT_Error )
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ftc_glyph_cache_init( FTC_GlyphCache gcache,
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FT_LruList_Class gset_class )
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{
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FT_Error error;
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error = ftc_cache_init( FTC_CACHE( gcache ) );
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if ( error )
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goto Exit;
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error = FT_LruList_New( gset_class, 0, gcache,
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gcache->cache.memory,
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&gcache->gset_lru );
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Exit:
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return error;
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}
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FT_EXPORT_DEF( FT_Error )
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ftc_glyph_cache_lookup( FTC_GlyphCache gcache,
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FTC_GlyphQuery query,
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FTC_GlyphNode *anode )
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{
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FT_LruNode node;
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FT_Error error;
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error = FT_LruList_Lookup( gcache->gset_lru, query, &node );
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if ( !error )
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{
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FTC_GlyphSet gset = (FTC_GlyphSet)node;
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FT_UFast hash = FTC_GSET_HASH( gset, query->gindex );
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error = ftc_cache_lookup_node( FTC_CACHE( gcache ), hash, query,
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FTC_NODE_P( anode ) );
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}
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return error;
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}
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/* END */
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