// $Id: fntcache.h 1282 2006-06-09 09:46:49Z alex $ /* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE ================================XARAHEADERSTART=========================== Xara LX, a vector drawing and manipulation program. Copyright (C) 1993-2006 Xara Group Ltd. Copyright on certain contributions may be held in joint with their respective authors. See AUTHORS file for details. LICENSE TO USE AND MODIFY SOFTWARE ---------------------------------- This file is part of Xara LX. Xara LX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Xara LX and its component source files are distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 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Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK. http://www.xara.com/ =================================XARAHEADEREND============================ */ /* * */ // Definition of the Text tools FontCache // See FNTCACHE.DOC for an explanation #ifndef INC_FNTCACHE #define INC_FNTCACHE //#include "ccobject.h" - in camtypes.h [AUTOMATICALLY REMOVED] //#include "listitem.h" - in camtypes.h [AUTOMATICALLY REMOVED] #include "gcache.h" //#include "txtattr.h" - in camtypes.h [AUTOMATICALLY REMOVED] #include /******************************************************************************************** > class FontCache Author: Simon_Maneggio (Xara Group Ltd) Created: 16/1/95 Purpose: The FontCache maps a character description to a path for that character. There only ever needs to be a single instance of the FontCache so all data and methods are static. Documentation: specs\fntcache.doc SeeAlso: CharDescription SeeAlso: PathHandleItem ********************************************************************************************/ // The simpler FontCache defined below is simply a wrapper around a CamCache class FontCache { // All data/methods must be static public: // This method must be called before we can use the CamCache static BOOL Init(); static BOOL InitCalled; // = FALSE, set to TRUE only if Init function has been called // This function must be called to destroy the font cache static void DeInit(); // Returns path for character specified by ChDesc static BOOL GetPath(CharDescription& ChDesc, INT32** Points, BYTE** Types, UINT32 *Length); // The path cache is used to map a Path Handle to path data static CamCache* pPathCache; static BOOL GetBounds(DocRect* pBounds, CharDescription& CharDesc); static BOOL CalcDefaultCharBounds(DocRect* pRect, CharDescription& CharDesc); static Path* CreateDefaultCharPath(CharDescription& CharDesc); private: static INT32 BoundsEntries; // number of entries in the char bounds cache }; #endif #if 0 // // WE ARE NOT USING THE HI-TECH FONT CACHE AT THE MOMENT // // // ------------------------------------------------------------------------------------------ // Constants // The cache size is the maximum number of characters to cache #define CACHE_SIZE 255 // We will allocate two arrays CacheA, CacheB each of length CACHE_LIST_SIZE. Each of these arrays // will never be more than 1/3 full //#define CACHE_LIST_SIZE (1.5 * CACHE_SIZE); // This MUST be prime or performance is naff #define CACHE_LIST_SIZE 383 //#define MAX_ITEMS_IN_CACHE_LIST = (CACHE_LIST_SIZE/3) #define MAX_ITEMS_IN_CACHE_LIST 255 // We can never allocate a path handle larger than MAX_FONT_HANDLE #define MAX_PATH_HANDLE (UINT32_MAX - 1) /******************************************************************************************** > class ClassName : public CCObject Author: Simon_Maneggio (Xara Group Ltd) Created: 16/1/95 Purpose: Each character we need to render can be uniquely identified by a 16 bit unicode character + various attributes which define the appearance of the characters font. The CharDescription structure defined below is used to identify a character. This structure is similar to the windows LOGFONT structure. SeeAlso: FontCache ********************************************************************************************/ class CharDescription : public CCObject { // Important !!! // Whenever this structure is changed, you must remember to update the operator= and // operator== methods !!! CC_DECLARE_DYNAMIC(CharDescription) public: INT32 operator==(const CharDescription& ChDesc); CharDescription& operator=(CharDescription& ChDesc); INT32 Height; INT32 Width; //INT32 lfEscapement; //INT32 lfOrientation; //INT32 lfWeight; BYTE Italic; //BYTE lfUnderline; //BYTE lfStrikeOut; //BYTE lfCharSet; //BYTE lfOutPrecision; //BYTE lfClipPrecision; //BYTE lfQuality; //BYTE lfPitchAndFamily; WCHAR CharCode; // A 16 bit unicode value }; /******************************************************************************************** > class PathHandleItem: public CCObject Author: Simon_Maneggio (Xara Group Ltd) Created: 16/1/95 Purpose: We store PathHandle Items in lists pointed to by the CacheA and CacheB arrays within the FontCache.They associate a CharDescription with a unique path handle. SeeAlso: FontCache SeeAlso: CharDescription ********************************************************************************************/ /* Technical notes: We want to minimise the size of the PathHandleItem. This is why they are not derived from ListItem. Instead they store a single Next pointer so that they can be linked together. */ class PathHandleItem: public CCObject { CC_DECLARE_DYNAMIC(PathHandleItem) public: PathHandleItem(CharDescription& ChDesc, UINT32 PathHandle); CharDescription CharDesc; // Identifies a character UINT32 PathHandle; // Removes this item from the specified list void RemoveItemFromList(PathHandleItem** pHead); PathHandleItem* Next; // pointer to the Next PathHandleItem }; class FontCache { // All data/methods must be static public: // This method must be called before we can use the CamCache static BOOL Init(); static BOOL InitCalled; // = FALSE, set to TRUE only if Init function has been called // This function must be called to destroy the font cache static void DeInit(); // Returns path for character specified by ChDesc static BOOL GetPath(CharDescription& ChDesc, INT32** Points, BYTE** Types, UINT32 *Length); #ifdef _DEBUG static void Test1(); #endif private: static UINT32 GetPathHandle(CharDescription& ChDesc); // Given a CharDescription returns an integer hash key in the range 0..CACHE_LIST_SIZE static UINT32 GetHashKey(CharDescription& ChDesc); // The two caches used to map a CharacterDescription to a Path Handle static PathHandleItem* CacheA [CACHE_LIST_SIZE]; static PathHandleItem* CacheB [CACHE_LIST_SIZE]; // Searches a PathHandleItem list for ChDesc item static PathHandleItem* GetPathHandleItem(PathHandleItem* ListHead, CharDescription& ChDesc); // Deletes all items in specified cache static void DeleteCacheLists(PathHandleItem** pCacheArray); static void TidyCache(); static PathHandleItem** PrimaryC; // Points to the current primary cache (CacheA or CacheB) static PathHandleItem** SecondaryC; // Points to the current secondary cache (CacheA or CacheB) static BOOL GetPathFromPathCache(UINT32 PathHandle, CharDescription& ChDesc, INT32** Points, BYTE** Types, UINT32* Length); // The path cache is used to map a Path Handle to path data static CamCache* pPathCache; static PathHandleItem* AllocatePathHandle(UINT32 Key, CharDescription& ChDesc); // The next PathHandle to assign to a new CharDescPathHandleItem we add to the cache static UINT32 NextUniquePathHandle; // The number of items stored in the primary cache static UINT32 NumItemsInPrimaryCache; // Can be deleted #ifdef _DEBUG static UINT32 PHits; static UINT32 SHits; static UINT32 Misses; #endif }; #endif