331 lines
9 KiB
C
331 lines
9 KiB
C
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/*
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* @doc INTERNAL
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*
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* @module _FONT.H -- Declaration of classes comprising font caching |
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*
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* Purpose:
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* Font cache
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*
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* Owner: <nl>
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* David R. Fulmer (original RE 1.0 code)<nl>
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* Christian Fortini (initial conversion to C++)<nl>
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* Jon Matousek <nl>
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*
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* History: <nl>
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* 8/6/95 jonmat Devised dynamic expanding cache for widths.
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*
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* Copyright (c) 1995-2000 Microsoft Corporation. All rights reserved.
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*/
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#ifndef _FONT_H
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#define _FONT_H
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#include "_kern.h"
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// Forwards
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class CFontCache;
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class CDevDesc;
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class CDisplay;
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// ============================= CCcs ========================
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// CCcs - caches font metrics and character size for one font
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#define DEFAULTCACHESIZE 0 // size - 1
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#define INITIALCACHESIZE 7 // size - 1 = 7; 2^n-1; size = 8
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#define PERFCHECKEPOCH 64 // If changed, you must recalc
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// and change COLLISION_SHIFT below.
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static const INT maxCacheSize = 511;
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SHORT GetFontNameIndex(const WCHAR *pFontName);
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BYTE GetFontLegitimateSize(LONG iFont, BOOL fUIFont, int iCharRep);
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BOOL SetFontLegitimateSize(LONG iFont, BOOL fUIFont, BYTE bSize, BOOL fFEcpg);
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void SetFontSignature(LONG iFont, QWORD qwFontSig);
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const WCHAR *GetFontName(LONG iFont);
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UINT GetTextCharsetInfoPri(HDC hdc, FONTSIGNATURE* pcsi, DWORD dwFlags);
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QWORD GetFontSignatureFromFace(int ifont, QWORD* pqwFontSig = NULL);
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void FreeFontNames();
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enum FONTINDEX
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{
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IFONT_ARIAL = 0,
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IFONT_TMSNEWRMN = 1,
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IFONT_SYMBOL = 2,
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IFONT_SYSTEM = 3
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};
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typedef unsigned int CCSHASHKEY;
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extern const WCHAR *szArial;
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extern const WCHAR *szTimesNewRoman;
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extern const WCHAR *szSymbol;
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extern const WCHAR *szSystem;
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extern const WCHAR *szWingdings;
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//Not automatically added to font table
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extern const WCHAR *szMicrosSansSerif;
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extern const WCHAR *szMSSansSerif;
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extern const WCHAR *szMangal;
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extern const WCHAR *szLatha;
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extern const WCHAR *szRaavi;
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extern const WCHAR *szShruti;
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extern const WCHAR *szTunga;
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extern const WCHAR *szGautami;
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extern const WCHAR *szCordiaNew;
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extern const WCHAR *szTahoma;
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extern const WCHAR *szArialUnicode;
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extern const WCHAR *szSylfaen;
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extern const WCHAR *szSyriac;
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extern const WCHAR *szThaana;
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/*
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* CWidthCache
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*
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* @class Lightweight Unicode width cache.
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*
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*
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* Owner: <nl>
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* Jon Matousek (jonmat) <nl>
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*/
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struct CacheEntry
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{
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WCHAR ch;
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SHORT width;
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};
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class CWidthCache
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{
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//@access Private methods and data
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friend class CCcs;
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private:
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INT _cacheSize; //@cmember size is total cache slots - 1.
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INT _cacheUsed; //@cmember for statistics, num slots in use.
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INT _collisions; //@cmember for statistics, num fetches required.
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INT _accesses; //@cmember for statistics, total num accesses.
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BOOL _fMaxPerformance; //@cmember for statistics, TRUE if grown to max.
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SHORT _dupCJK;
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//@cmember default storage for widths.
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CacheEntry _defaultWidthCache[DEFAULTCACHESIZE+1];
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//@cmember pointers to storage for widths.
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CacheEntry *(_pWidthCache);
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__forceinline BOOL FLookasideCharacter(WCHAR ch)
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{
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if (ch < 0x3400)
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return FALSE;
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if (IN_RANGE(0x3400, ch, 0x9FFF) || // CJK ideograph
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IN_RANGE(0xF900, ch, 0xFAFF) || // CJK compatibility ideograph
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IN_RANGE(0xAC00, ch, 0xD7FF)) // Hangul
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return TRUE;
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return FALSE;
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}
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//@cmember Get location where width is stored.
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inline CacheEntry * GetEntry( const WCHAR ch )
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{ // logical & is really a MOD, as all of the bits
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// of cacheSize are turned on; the value of cacheSize is
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// required to be of the form 2^n-1.
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return &_pWidthCache[ ch & _cacheSize ];
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}
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//@cmember See if cache is performing within spec.
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void CheckPerformance();
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//@cmember Increase width cache size.
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BOOL GrowCache( CacheEntry **widthCache, INT *cacheSize, INT *cacheUsed);
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//@access Public Methods
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public:
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//@cmember Called before GetWidth
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BOOL CheckWidth (const WCHAR ch, LONG &dup);
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//@cmember Fetch width if CheckWidth ret FALSE.
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void Free(); //@cmember Recycle width cache
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CWidthCache(); //@cmember Construct width cache
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~CWidthCache(); //@cmember Free dynamic mem
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};
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class CCcs
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{
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friend class CFontCache;
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private:
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CCSHASHKEY _ccshashkey; // Hash key
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DWORD _dwAge; // for LRU algorithm
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SHORT _iFont; // Index into FONTNAME table
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SHORT _cRefs; // ref. count
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class CWidthCache _widths;
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public:
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QWORD _qwFontSig; // Internal font signature flags
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HDC _hdc; // HDC font is selected into
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HFONT _hfont; // Windows font handle
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void* _sc; // A handle to the Uniscribe glyph width/font cmap information
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//REVIEW (keithcu) We should make these into at least 24 bit or possibly 32 bit values,
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//or at least use unsigned values so that we don't overflow as easily.
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SHORT _yHeightRequest;// Font height requested (logical units)
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SHORT _yHeight; // Total height of char cell (logical units)
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SHORT _yDescent; // Distance from baseline to char cell bottom (logical units)
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SHORT _xAveCharWidth; // Average character width in logical units
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SHORT _xOverhangAdjust;// Overhang for synthesized fonts in logical units
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SHORT _dyULOffset; // Underline offset
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SHORT _dyULWidth; // Underline width
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SHORT _dySOOffset; // Strikeout offset
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SHORT _dySOWidth; // Strikeout width
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USHORT _weight; // Font weight
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USHORT _wCodePage; // Font code page
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BYTE _bCharSetRequest; //Requested charset
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BYTE _bCharSet; // Font CharSet
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BYTE _bCMDefault; // Used in calculation of _bConvertMode
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BYTE _bConvertMode; // CONVERTMODE: CVT_NONE, CVT_WCTMB, CVT_LOWBYTE
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BYTE _bPitchAndFamily;// Font pitch and family
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TFLOW _tflow; // Tflow of _hfont
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BYTE _bQuality; // LOGFONT quality
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BYTE _fValid:1; // CCcs is valid
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BYTE _fFixPitchFont:1; // Font has fixed character width
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BYTE _fItalic:1; // Font is italic
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BYTE _fFECharSet:1; // Font has FE charset
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BYTE _fForceTrueType:1; // Font has been forced to be truetype
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BYTE _fCustomTextOut:1; // Should we use the ICustomTextOut handlers?
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BYTE _fUseAtFont:1; // Switch to @ font
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private:
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BOOL Compare (const CCharFormat * const pCF, HDC hdc, DWORD dwFlags);
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BOOL MakeFont(const CCharFormat * const pCF);
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void DestroyFont();
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BOOL GetMetrics(WCHAR *szNewFaceName = 0);
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HFONT GetFontWithMetrics(LOGFONT *plf, WCHAR* szNewFaceName);
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BOOL FillWidth(WCHAR ch, LONG &dup);
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public:
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CCcs () {_fValid = FALSE;}
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~CCcs () {if(_fValid) Free();}
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void GetFontOverhang(LONG *pdupOverhang, LONG *pdupUnderhang);
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void GetOffset(const CCharFormat * const pCF, LONG dvpInch,
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LONG *pyOffset, LONG *pyAdjust);
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BOOL Init(const CCharFormat * const pCF);
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void Free();
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void AddRef() {_cRefs++;}
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void Release() {if(_cRefs) _cRefs--;}
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BOOL Include(WCHAR ch, LONG &dup)
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{
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if(!_widths.CheckWidth(ch, dup))
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return FillWidth(ch, dup);
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return TRUE;
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}
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BYTE BestCharRep(BYTE iCharRep, BYTE iCharRepDefault, int fFontMatching);
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SHORT AdjustFEHeight(BOOL fAjdust)
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{return ((fAjdust && _fFECharSet) ? W32MulDiv(_yHeight, 15, 100) : 0);}
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};
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// FONTINFO cache
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typedef union
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{
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WORD wFlags;
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struct
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{
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WORD fCached :1; // Font signature was already cached
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WORD fBadFaceName :1; // Face is junk or doesnt exist in the system
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WORD fTrueType :1; // Font is TrueType
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WORD fBitmap :1; // Font is Bitmap
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WORD fNonBiDiAscii :1; // Font is non-BiDi, single charset and support ASCII
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WORD fScaleByCpg :1; // Scale the font based on given codepage
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WORD fThaiDTP :1; // Thai DTP font
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};
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} FONTINFO_FLAGS;
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class CFontFamilyMember
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{
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public:
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CFontFamilyMember(LONG weight, BOOL fItalic)
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{
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_weight = weight; _fItalic = fItalic;
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}
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void Free() {_kc.Free();}
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CKernCache* GetKernCache() {return &_kc;}
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LONG _weight;
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BOOL _fItalic;
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CKernCache _kc;
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};
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class CFontFamilyMgr
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{
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public:
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CFontFamilyMgr::~CFontFamilyMgr();
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CFontFamilyMember *GetFontFamilyMember(LONG weight, BOOL fItalic);
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CArray <CFontFamilyMember> _rgf;
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};
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struct FONTINFO
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{
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const WCHAR *szFontName;
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QWORD qwFontSig; // Font signature
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BYTE bSizeUI; // UI font legitimate size (in point)
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BYTE bSizeNonUI; // Non-UI font legitimate size
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FONTINFO_FLAGS ff; // flags
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CFontFamilyMgr* _pffm; // Information which is different for
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}; // bold/italic variants of a font
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// ============================= CFontCache =====================================================
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// CFontCache - maintains up to FONTCACHESIZE font caches
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//The low 2 bits are reserved for passing down the TFLOW of the text
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const DWORD FGCCSUSETRUETYPE = 0x04;
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const DWORD FGCCSUSEATFONT = 0x08;
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class CFontCache
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{
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friend class CCcs;
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private:
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CCcs _rgccs[FONTCACHESIZE];
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DWORD _dwAgeNext;
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struct {
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CCSHASHKEY ccshashkey;
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CCcs *pccs;
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} quickHashSearch[CCSHASHSEARCHSIZE+1];
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private:
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CCcs* GrabInitNewCcs(const CCharFormat * const pCF, HDC hdc, DWORD dwFlags);
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CCSHASHKEY MakeHashKey(const CCharFormat *pCF);
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public:
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void Init();
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CFontFamilyMgr * GetFontFamilyMgr(LONG iFont);
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CKernCache * GetKernCache(LONG iFont, LONG weight, BOOL fItalic);
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CCcs* GetCcs(CCharFormat *pCF, const LONG dvpInch, DWORD dwFlags, HDC hdc = 0);
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FONTINFO_FLAGS GetInfoFlags(int ifont);
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};
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extern CFontCache & fc(); // font cache manager
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#endif
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