Edit
kc3-lang/freetype/src/cache/ftcmru.h
Alexei Podtelezhnikov
- src/cache/ftcmru.h
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/**************************************************************************** * * ftcmru.h * * Simple MRU list-cache (specification). * * Copyright (C) 2000-2024 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. * */ /************************************************************************** * * An MRU is a list that cannot hold more than a certain number of * elements (`max_elements'). All elements in the list are sorted in * least-recently-used order, i.e., the `oldest' element is at the tail * of the list. * * When doing a lookup (either through `Lookup()' or `Lookup_Node()'), * the list is searched for an element with the corresponding key. If * it is found, the element is moved to the head of the list and is * returned. * * If no corresponding element is found, the lookup routine will try to * obtain a new element with the relevant key. If the list is already * full, the oldest element from the list is discarded and replaced by a * new one; a new element is added to the list otherwise. * * Note that it is possible to pre-allocate the element list nodes. * This is handy if `max_elements' is sufficiently small, as it saves * allocations/releases during the lookup process. * */ #ifndef FTCMRU_H_ #define FTCMRU_H_ #include <freetype/freetype.h> #include <freetype/internal/compiler-macros.h> #ifdef FREETYPE_H #error "freetype.h of FreeType 1 has been loaded!" #error "Please fix the directory search order for header files" #error "so that freetype.h of FreeType 2 is found first." #endif #define xxFT_DEBUG_ERROR #define FTC_INLINE FT_BEGIN_HEADER typedef struct FTC_MruNodeRec_* FTC_MruNode; typedef struct FTC_MruNodeRec_ { FTC_MruNode next; FTC_MruNode prev; } FTC_MruNodeRec; FT_LOCAL( void ) FTC_MruNode_Prepend( FTC_MruNode *plist, FTC_MruNode node ); FT_LOCAL( void ) FTC_MruNode_Up( FTC_MruNode *plist, FTC_MruNode node ); FT_LOCAL( void ) FTC_MruNode_Remove( FTC_MruNode *plist, FTC_MruNode node ); typedef struct FTC_MruListRec_* FTC_MruList; typedef struct FTC_MruListClassRec_ const * FTC_MruListClass; typedef FT_Bool (*FTC_MruNode_CompareFunc)( FTC_MruNode node, FT_Pointer key ); typedef FT_Error (*FTC_MruNode_InitFunc)( FTC_MruNode node, FT_Pointer key, FT_Pointer data ); typedef FT_Error (*FTC_MruNode_ResetFunc)( FTC_MruNode node, FT_Pointer key, FT_Pointer data ); typedef void (*FTC_MruNode_DoneFunc)( FTC_MruNode node, FT_Pointer data ); typedef struct FTC_MruListClassRec_ { FT_Offset node_size; FTC_MruNode_CompareFunc node_compare; FTC_MruNode_InitFunc node_init; FTC_MruNode_ResetFunc node_reset; FTC_MruNode_DoneFunc node_done; } FTC_MruListClassRec; typedef struct FTC_MruListRec_ { FT_UInt num_nodes; FT_UInt max_nodes; FTC_MruNode nodes; FT_Pointer data; FTC_MruListClassRec clazz; FT_Memory memory; } FTC_MruListRec; FT_LOCAL( void ) FTC_MruList_Init( FTC_MruList list, FTC_MruListClass clazz, FT_UInt max_nodes, FT_Pointer data, FT_Memory memory ); FT_LOCAL( void ) FTC_MruList_Reset( FTC_MruList list ); FT_LOCAL( void ) FTC_MruList_Done( FTC_MruList list ); FT_LOCAL( FT_Error ) FTC_MruList_New( FTC_MruList list, FT_Pointer key, FTC_MruNode *anode ); FT_LOCAL( void ) FTC_MruList_Remove( FTC_MruList list, FTC_MruNode node ); FT_LOCAL( void ) FTC_MruList_RemoveSelection( FTC_MruList list, FTC_MruNode_CompareFunc selection, FT_Pointer key ); #ifdef FTC_INLINE #define FTC_MRULIST_LOOKUP_CMP( list, key, compare, node, error ) \ FT_BEGIN_STMNT \ FTC_MruNode* _pfirst = &(list)->nodes; \ FTC_MruNode_CompareFunc _compare = (FTC_MruNode_CompareFunc)(compare); \ FTC_MruNode _first, _node; \ \ \ error = FT_Err_Ok; \ _first = *(_pfirst); \ _node = NULL; \ \ if ( _first ) \ { \ _node = _first; \ do \ { \ if ( _compare( _node, (key) ) ) \ { \ if ( _node != _first ) \ FTC_MruNode_Up( _pfirst, _node ); \ \ node = _node; \ goto MruOk_; \ } \ _node = _node->next; \ \ } while ( _node != _first); \ } \ \ error = FTC_MruList_New( (list), (key), (FTC_MruNode*)(void*)&(node) ); \ MruOk_: \ ; \ FT_END_STMNT #define FTC_MRULIST_LOOKUP( list, key, node, error ) \ FTC_MRULIST_LOOKUP_CMP( list, key, (list)->clazz.node_compare, node, error ) #else /* !FTC_INLINE */ FT_LOCAL( FTC_MruNode ) FTC_MruList_Find( FTC_MruList list, FT_Pointer key ); FT_LOCAL( FT_Error ) FTC_MruList_Lookup( FTC_MruList list, FT_Pointer key, FTC_MruNode *pnode ); #define FTC_MRULIST_LOOKUP( list, key, node, error ) \ error = FTC_MruList_Lookup( (list), (key), (FTC_MruNode*)&(node) ) #endif /* !FTC_INLINE */ #define FTC_MRULIST_LOOP( list, node ) \ FT_BEGIN_STMNT \ FTC_MruNode _first = (list)->nodes; \ \ \ if ( _first ) \ { \ FTC_MruNode _node = _first; \ \ \ do \ { \ *(FTC_MruNode*)&(node) = _node; #define FTC_MRULIST_LOOP_END() \ _node = _node->next; \ \ } while ( _node != _first ); \ } \ FT_END_STMNT /* */ FT_END_HEADER #endif /* FTCMRU_H_ */ /* END */