freetype2/src/cache/ftcsbits.h

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/****************************************************************************
*
* ftcsbits.h
*
* A small-bitmap cache (specification).
*
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* Copyright (C) 2000-2019 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.
*
*/
#ifndef FTCSBITS_H_
#define FTCSBITS_H_
#include <ft2build.h>
#include FT_CACHE_H
#include "ftcglyph.h"
FT_BEGIN_HEADER
#define FTC_SBIT_ITEMS_PER_NODE 16
typedef struct FTC_SNodeRec_
{
FTC_GNodeRec gnode;
FT_UInt count;
FTC_SBitRec sbits[FTC_SBIT_ITEMS_PER_NODE];
} FTC_SNodeRec, *FTC_SNode;
#define FTC_SNODE( x ) ( (FTC_SNode)( x ) )
#define FTC_SNODE_GINDEX( x ) FTC_GNODE( x )->gindex
#define FTC_SNODE_FAMILY( x ) FTC_GNODE( x )->family
typedef FT_UInt
(*FTC_SFamily_GetCountFunc)( FTC_Family family,
FTC_Manager manager );
typedef FT_Error
(*FTC_SFamily_LoadGlyphFunc)( FTC_Family family,
FT_UInt gindex,
FTC_Manager manager,
FT_Face *aface );
typedef struct FTC_SFamilyClassRec_
{
FTC_MruListClassRec clazz;
FTC_SFamily_GetCountFunc family_get_count;
FTC_SFamily_LoadGlyphFunc family_load_glyph;
} FTC_SFamilyClassRec;
typedef const FTC_SFamilyClassRec* FTC_SFamilyClass;
#define FTC_SFAMILY_CLASS( x ) ((FTC_SFamilyClass)(x))
#define FTC_CACHE_SFAMILY_CLASS( x ) \
FTC_SFAMILY_CLASS( FTC_CACHE_GCACHE_CLASS( x )->family_class )
FT_LOCAL( void )
FTC_SNode_Free( FTC_SNode snode,
FTC_Cache cache );
FT_LOCAL( FT_Error )
FTC_SNode_New( FTC_SNode *psnode,
FTC_GQuery gquery,
FTC_Cache cache );
#if 0
FT_LOCAL( FT_ULong )
FTC_SNode_Weight( FTC_SNode inode );
#endif
#ifdef FTC_INLINE
FT_LOCAL( FT_Bool )
FTC_SNode_Compare( FTC_SNode snode,
FTC_GQuery gquery,
[cache] Notice if a cache query induced the node list change. Some node comparators (comparing the cache node content and the properties specified by the query) can flush the cache node to prevent the cache inflation. The change may invalidate the pointers to the node obtained before the node comparison, so the change should be noticed to the caller. The problem caused by the cache node changing is reported by Harsha, see Savannah bug #31923. * src/cache/ftccache.h (FTC_Node_CompareFunc): Add new argument `FT_Bool* list_changed' to indicate the change of the cached nodes to the caller. (FTC_CACHE_LOOKUP_CMP): Watch the change of the cached nodes by `_list_changed'. (FTC_CACHE_TRYLOOP_END): Take new macro argument `_list_changed' and update it when FTC_Manager_FlushN() flushes any nodes. * src/cache/ftccback.h (ftc_snode_compare): Updated to fit with new FTC_Node_CompareFunc type. (ftc_gnode_compare): Ditto. * src/cache/ftcbasic.c: Include FT_INTERNAL_OBJECTS_H to use TRUE/FALSE macros. (ftc_basic_gnode_compare_faceid): New argument `FT_Bool* list_changed' to indicate the change of the cache nodes, anyway, it is always FALSE. * src/cache/ftccmap.c: Include FT_INTERNAL_OBJECTS_H to use TRUE/FALSE macros. (ftc_cmap_node_compare): New argument `FT_Bool* list_changed' to indicate the change of the cache nodes, anyway, it is always FALSE. (ftc_cmap_node_remove_faceid): Ditto. * src/cache/ftccache.c (FTC_Cache_NewNode): Pass a NULL pointer to FTC_CACHE_TRYLOOP_END(), because the result is not needed. (FTC_Cache_Lookup): Watch the change of the cache nodes by `list_changed'. (FTC_Cache_RemoveFaceID): Ditto. * src/cache/ftcglyph.c: Include FT_INTERNAL_OBJECTS_H to use TRUE/FALSE macros. (ftc_gnode_compare): New argument `FT_Bool* list_changed' to indicate the change of the cache nodes, anyway, it is always FALSE. (FTC_GNode_Compare): New argument `FT_Bool* list_changed' to be passed to ftc_gnode_compare(). * src/cache/ftcglyph.h (FTC_GNode_Compare): Ditto. * src/cache/ftcsbits.c (ftc_snode_compare): New argument `FT_Bool* list_changed' to indicate the change of the cache nodes, anyway. It is updated by FTC_CACHE_TRYLOOP(). (FTC_SNode_Compare): New argument `FT_Bool* list_changed' to be passed to ftc_snode_compare(). * src/cache/ftcsbits.h (FTC_SNode_Compare): Ditto.
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FTC_Cache cache,
FT_Bool* list_changed);
#endif
/* */
FT_END_HEADER
#endif /* FTCSBITS_H_ */
/* END */