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windows-nt/Source/XPSP1/NT/windows/richedit/re30/font.cpp
CryptoAlgo Inc b3cac27891 Add source files
2020-09-26 16:20:57 +08:00

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/*
* @doc INTERNAL
*
* @module FONT.CPP -- font cache |
*
* Includes font cache, char width cache;
* create logical font if not in cache, look up
* character widths on an as needed basis (this
* has been abstracted away into a separate class
* so that different char width caching algos can
* be tried.) <nl>
*
* Owner: <nl>
* RichEdit 1.0 code: David R. Fulmer
* Christian Fortini (initial conversion to C++)
* Jon Matousek <nl>
*
* History: <nl>
* 7/26/95 jonmat cleanup and reorganization, factored out
* char width caching code into a separate class.
*
* Copyright (c) 1995-1998 Microsoft Corporation. All rights reserved.
*/
#include "_common.h"
#include "_font.h"
#include "_rtfconv.h" // Needed for GetCodePage
#include "_uspi.h"
#define CLIP_DFA_OVERRIDE 0x40 // Used to disable Korea & Taiwan font association
#define FF_BIDI 7
ASSERTDATA
// Corresponds to yHeightCharPtsMost in richedit.h
#define yHeightCharMost 32760
// NOTE: this is global across all instances in the same process.
static CFontCache *g_fc;
static FONTINFO *g_pFontInfo = NULL;
static LONG g_cFontInfo = 0;
static LONG g_cFontInfoMax = 0;
//Fonts automatically added to our font table
const WCHAR *szArial = L"Arial"; // IFONT_ARIAL
const WCHAR *szTimesNewRoman = L"Times New Roman"; // IFONT_TIMESNEWROMAN
const WCHAR *szSymbol = L"Symbol"; // IFONT_SYMBOL
const WCHAR *szSystem = L"System"; // IFONT_SYSTEM
const int cfontsDflt = 4;
//Other fonts that we do use, but aren't automatically added to our font table
const WCHAR *szMicrosSansSerif = L"Microsoft Sans Serif";
const WCHAR *szMSSansSerif = L"MS Sans Serif";
const WCHAR *szMangal = L"Mangal";
const WCHAR *szLatha = L"Latha";
const WCHAR *szCordiaNew = L"Cordia New";
const WCHAR *szTahoma = L"Tahoma";
const WCHAR *szArialUnicode = L"Arial Unicode MS";
const WCHAR *szWingdings = L"Wingdings";
#define szFontOfChoice szArial
/*
* GetFontNameIndex(pFontName)
*
* @func
* return index into global pszFontName table for fontname pFontName.
* If fontname isn't in table, add it and return index.
*
* @rdesc
* fontname index corresponding to pFontName
*
* @devnote
* This uses a linear search, so the most common font names should be
* up front. Internally, we use the fontname indices, so the search
* isn't done that often. Note also that the fontname table only grows,
* but this is probably OK for most clients. Else we need ref counting...
*/
SHORT GetFontNameIndex(
const WCHAR *pFontName)
{
CLock Lock; // Wonder how much this slows things down...
for(LONG i = 0; i < g_cFontInfo; i++)
{
// A hash could speed this up if perf turns out poor
if(!wcscmp(pFontName, g_pFontInfo[i].szFontName))
return i;
}
if(g_cFontInfo + 1 >= g_cFontInfoMax)
{
// Note that PvReAlloc() reverts to PvAlloc() if g_pFontInfo is NULL
FONTINFO *pFI = (FONTINFO *)PvReAlloc((LPVOID)g_pFontInfo,
sizeof(FONTINFO) * (8 + g_cFontInfo));
if(!pFI)
return IFONT_ARIAL; // Out of memory...
// Initialize the structure
ZeroMemory (&pFI[g_cFontInfo], 8 * sizeof(FONTINFO));
// attempts to fill them in
if(!g_cFontInfoMax) // First allocation
{
Assert(IFONT_ARIAL == 0 && IFONT_TMSNEWRMN == 1 &&
IFONT_SYMBOL == 2 && IFONT_SYSTEM == 3);
pFI[IFONT_ARIAL].szFontName = szArial;
pFI[IFONT_TMSNEWRMN].szFontName = szTimesNewRoman;
pFI[IFONT_SYMBOL].szFontName = szSymbol;
pFI[IFONT_SYSTEM].szFontName = szSystem;
g_cFontInfo = cfontsDflt;
}
g_pFontInfo = pFI;
g_cFontInfoMax += 8;
}
LONG cb = (wcslen(pFontName) + 1)*sizeof(WCHAR);
WCHAR * pch = (WCHAR *)PvAlloc(cb, GMEM_MOVEABLE);
if(!pch)
return IFONT_ARIAL; // Out of memory...
g_pFontInfo[g_cFontInfo].szFontName = pch;
CopyMemory((void *)pch, pFontName, cb);
return g_cFontInfo++;
}
/*
* GetFontName(iFont)
*
* @func
* return fontname given by g_pFontInfo[iFont].szFontName.
*
* @rdesc
* fontname corresponding to fontname index iFont
*/
const WCHAR *GetFontName(
LONG iFont)
{
return (iFont < g_cFontInfo) ? g_pFontInfo[iFont].szFontName : NULL;
}
/*
* SetFontLegitimateSize(iFont, fUIFont, iSize)
*
* @func
* Set the legitimate size (readable smallest size to use) of a given font
*/
BOOL SetFontLegitimateSize(
LONG iFont,
BOOL fUIFont,
BYTE bSize,
int cpg)
{
if (iFont < g_cFontInfo)
{
// Far East wanted to do it per codepage.
//
// FUTURE: Bear in mind that this approach is bug-prone. Once there's
// any new FE font created with different metric from the existing one.
// Font scaling will not perform well or even broken for such font [wchao].
g_pFontInfo[iFont].ff.fScaleByCpg = W32->IsFECodePage(cpg);
if (fUIFont)
{
if (!g_pFontInfo[iFont].bSizeUI)
g_pFontInfo[iFont].bSizeUI = bSize;
else
// more than one legit size were updated per font,
// We fallback to the codepage-driven approach.
g_pFontInfo[iFont].ff.fScaleByCpg = g_pFontInfo[iFont].bSizeUI != bSize;
}
else
{
if (!g_pFontInfo[iFont].bSizeNonUI)
g_pFontInfo[iFont].bSizeNonUI = bSize;
else
g_pFontInfo[iFont].ff.fScaleByCpg = g_pFontInfo[iFont].bSizeNonUI != bSize;
}
return TRUE;
}
return FALSE;
}
BYTE GetFontLegitimateSize(
LONG iFont,
BOOL fUIFont,
int cpg) // requested size for given codepage
{
SHORT iDefFont;
BYTE bDefPaf;
BYTE yHeight = 0;
if (iFont < g_cFontInfo && !g_pFontInfo[iFont].ff.fScaleByCpg)
yHeight = fUIFont ? g_pFontInfo[iFont].bSizeUI : g_pFontInfo[iFont].bSizeNonUI;
if (!yHeight && fc().GetInfoFlags(iFont).fNonBiDiAscii)
{
// non-BiDi ASCII font uses table font (of the same charset) legitimate height
DWORD dwSig = GetFontSignatureFromFace(iFont) & ~((fASCII | fFE) >> 8);
int cpg = GetCodePage(GetFirstAvailCharSet(dwSig));
W32->GetPreferredFontInfo(cpg, fUIFont ? true : false, iDefFont, yHeight, bDefPaf);
SetFontLegitimateSize(iFont, fUIFont ? true : false, yHeight ? yHeight : fUIFont ? 8 : 10, cpg);
}
if (!yHeight)
{
if (fc().GetInfoFlags(iFont).fThaiDTP)
{
cpg = THAI_INDEX;
fUIFont = FALSE;
}
W32->GetPreferredFontInfo(cpg, fUIFont ? true : false, iDefFont, yHeight, bDefPaf);
}
return yHeight ? yHeight : fUIFont ? 8 : 10;
}
/*
* GetTextCharsetInfoPri(hdc, pFontSig, dwFlags)
*
* @func
* Wrapper to GDI's GetTextCharsetInfo. This to handle BiDi old-style fonts
*/
UINT GetTextCharsetInfoPri(
HDC hdc,
FONTSIGNATURE* pFontSig,
DWORD dwFlags)
{
OUTLINETEXTMETRICA otm;
INT uCharSet = -1;
if (pFontSig && GetOutlineTextMetricsA(hdc, sizeof(OUTLINETEXTMETRICA), &otm))
{
ZeroMemory (pFontSig, sizeof(FONTSIGNATURE));
switch (otm.otmfsSelection & 0xFF00)
{
case 0xB200: // Arabic Simplified
case 0xB300: // Arabic Traditional
case 0xB400: // Arabic Old UDF
uCharSet = ARABIC_CHARSET; break;
case 0xB100: // Hebrew Old style
uCharSet = HEBREW_CHARSET;
}
}
if (uCharSet == -1)
uCharSet = GetTextCharsetInfo(hdc, pFontSig, dwFlags);
if (uCharSet == DEFAULT_CHARSET)
uCharSet = ANSI_CHARSET; // never return ambiguous
return (UINT)uCharSet;
}
/*
* GetFontSignatureFromFace(iFont, DWORD* pdwFontSig)
*
* @func
* Giving font signature matching the index of given facename.
* This signature may not match the one in Cccs since this is the
* signature of the font of given facename. The Cccs one is
* per GDI realization.
*
* @rdesc
* - font signature if pdwFontSig is NULL.
* - If pdwFontSig != NULL. It's a boolean.
* ZERO means returned signature is not sensible by following reasons
* 1. Bad facename (junk like "!@#$" or name that doesnt exist in the system)
* 2. Given face doesnt support even one valid ANSI codepage (symbol fonts i.e, Marlett)
*/
DWORD GetFontSignatureFromFace(
int iFont,
DWORD* pdwFontSig)
{
Assert((unsigned)iFont < (unsigned)g_cFontInfo);
DWORD dwFontSig = g_pFontInfo[iFont].dwFontSig;
FONTINFO_FLAGS ff;
ff.wFlags = g_pFontInfo[iFont].ff.wFlags;
if(!ff.fCached)
{
LOGFONT lf;
HDC hdc = GetDC(NULL);
WCHAR* pwchTag = lf.lfFaceName;
int i = 0;
ZeroMemory(&lf, sizeof(LOGFONT));
wcscpy(lf.lfFaceName, GetFontName(iFont));
// exclude Win95's tag name e.g. "Arial(Greek)"
while (pwchTag[i] && pwchTag[i] != '(')
i++;
if(pwchTag[i] && i > 0)
{
while (i > 0 && pwchTag[i-1] == 0x20)
i--;
pwchTag[i] = 0;
}
lf.lfCharSet = DEFAULT_CHARSET;
// obtain a charset supported by given facename
// to force GDI gives facename priority over charset.
W32->GetFacePriCharSet(hdc, &lf);
HFONT hfont = CreateFontIndirect(&lf);
if(hfont)
{
HFONT hfontOld = SelectFont(hdc, hfont);
WCHAR szNewFaceName[LF_FACESIZE];
GetTextFace(hdc, LF_FACESIZE, szNewFaceName);
if(!wcsicmp(szNewFaceName, lf.lfFaceName) || // Got it
((GetCharFlags(szNewFaceName[0]) & fFE) && // or Get back FE font name for English name
(GetCharFlags(lf.lfFaceName[0]) & fASCII))) // because NT5 supports dual font names.
{
CHARSETINFO csi;
// Try to get FONTSIGNATURE data
UINT uCharSet = GetTextCharsetInfoPri(hdc, &(csi.fs), 0);
DWORD dwUsb0 = W32->OnWin9x() ? 0 : csi.fs.fsUsb[0];
if ((csi.fs.fsCsb[0] | dwUsb0) ||
TranslateCharsetInfo((DWORD *)(DWORD_PTR)uCharSet, &csi, TCI_SRCCHARSET))
{
CUniscribe* pusp;
SCRIPT_CACHE sc = NULL;
WORD wGlyph;
dwFontSig = csi.fs.fsCsb[0];
// Also look at Unicode subrange if available
// FUTURE: we may want to drive Unicode ranges with a
// table approach, i.e., use for loop shifting dwUsb0 right
// to convert each bit into an index into a table of BYTEs
// that return the appropriate script index for rgCpgCharSet:
//
// for(LONG i = 0; dwUsb0; dwUsb0 >>= 1, i++)
// {
// static const BYTE iScript[32] = {...};
// if(dwUsb0 & 1)
// dwFontSig |= W32->GetFontSigFromScript(iScript[i]);
// }
if (dwUsb0 & 0x00008000)
dwFontSig |= fDEVANAGARI >> 8;
if (dwUsb0 & 0x00100000)
dwFontSig |= fTAMIL >> 8;
if (dwUsb0 & 0x00000400)
dwFontSig |= fARMENIAN >> 8;
if (dwUsb0 & 0x04000000)
dwFontSig |= fGEORGIAN >> 8;
if((dwFontSig & fCOMPLEX_SCRIPT >> 8) && !(dwFontSig & fHILATIN1 >> 8)
&& (pusp = GetUniscribe()))
{
// signature says no Latin-1 support
// Search for the 'a' and '0' glyph in the font to determine if the font
// supports ASCII or European Digit. This is necessary to overcome
// the font having incomplete font signature.
//
if (ScriptGetCMap(hdc, &sc, L"a", 1, 0, &wGlyph) == S_OK)
dwFontSig |= fASCIIUPR >> 8;
if (ScriptGetCMap(hdc, &sc, L"0", 1, 0, &wGlyph) == S_OK)
dwFontSig |= fBELOWX40 >> 8;
if (!IsBiDiCharSet(uCharSet) &&
(dwFontSig & (fASCII >> 8)) == fASCII >> 8)
ff.fNonBiDiAscii = 1; // non-BiDi ASCII font
ScriptFreeCache(&sc);
}
if (dwFontSig & fHILATIN1 >> 8)
dwFontSig |= fASCII >> 8; // fLATIN1 has 3 bits
// HACK for symbol font. We assign 0x04000(fSYMBOL >> 8) for Symbol font signature.
if (uCharSet == SYMBOL_CHARSET && !(dwFontSig & 0x3fffffff))
dwFontSig |= fSYMBOL >> 8;
}
}
else
{
ff.fBadFaceName = TRUE;
}
TEXTMETRIC tm;
GetTextMetrics(hdc, &tm);
ff.fTrueType = tm.tmPitchAndFamily & TMPF_TRUETYPE ? 1 : 0;
ff.fBitmap = tm.tmPitchAndFamily & (TMPF_TRUETYPE | TMPF_VECTOR | TMPF_DEVICE) ? 0 : 1;
if (!ff.fBadFaceName && dwFontSig & (fTHAI >> 8))
{
// Some heuristic test on Thai fonts.
// Most Thai fonts will fall to this category currently except for
// Tahoma and Microsoft Sans Serif.
ff.fThaiDTP = tm.tmDescent && tm.tmAscent/tm.tmDescent < 3;
}
SelectObject(hdc, hfontOld);
SideAssert(DeleteObject(hfont));
}
ReleaseDC(NULL, hdc);
// Cache code pages supported by this font
ff.fCached = TRUE;
g_pFontInfo[iFont].dwFontSig = dwFontSig;
g_pFontInfo[iFont].ff.wFlags = ff.wFlags;
}
if (!pdwFontSig)
return dwFontSig;
*pdwFontSig = dwFontSig;
// Exclude bit 30-31 (as system reserved - NT masks 31 as symbol codepage)
// 22-29 are reserved for alternate ANSI/OEM, as of now we use 21, 22 for Devanagari and Tamil
return (DWORD)((dwFontSig & 0x3fffffff) && !ff.fBadFaceName);
}
/*
* FreeFontNames()
*
* @func
* Free fontnames given by g_pFontInfo[i].szFontName allocated by
* GetFontNameIndex() as well as g_pFontInfo itself.
*/
void FreeFontNames()
{
for(LONG i = cfontsDflt; i < g_cFontInfo; i++)
FreePv((LPVOID)g_pFontInfo[i].szFontName);
FreePv(g_pFontInfo);
g_pFontInfo = NULL;
}
SHORT g_iFontJapanese;
SHORT g_iFontHangul;
SHORT g_iFontBig5;
SHORT g_iFontGB2312;
/*
* InitFontCache()
*
* @func
* Initializes font cache.
*
* @devnote
* This is exists so reinit.cpp doesn't have to know all about the
* font cache.
*/
void InitFontCache()
{
g_fc = new CFontCache;
g_fc->Init();
}
/*
* FreeFontCache()
*
* @mfunc
* Frees font cache.
*
* @devnote
* This is exists so reinit.cpp doesn't have to know all about the
* font cache.
*/
void FreeFontCache()
{
delete g_fc;
g_fc = NULL;
FreeFontNames();
}
/*
* CFontCache & fc()
*
* @func
* initialize the global g_fc.
* @comm
* current #defined to store 16 logical fonts and
* respective character widths.
*
*/
CFontCache & fc()
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "fc");
return *g_fc;
}
FONTINFO_FLAGS CFontCache::GetInfoFlags(int ifont)
{
if (!g_pFontInfo[ifont].ff.fCached)
GetFontSignatureFromFace(ifont);
return g_pFontInfo[ifont].ff;
}
// =================================== CFontCache ====================================
/*
* CFontCache::Init()
*
* @mfunc
* Initializes font cache.
*
* @devnote
* This is not a constructor because something bad seems to happen
* if we try to construct a global object.
*/
void CFontCache::Init()
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CFontCache::CFontCache");
_dwAgeNext = 0;
}
/*
* CFontCache::MakeHashKey(pCF)
*
* @mfunc
* Build a hash key for quick searches for a CCcs matching
* the pCF.
* Format:
* iFont : 14
* Bold/Italic : 2
* Height : 16
*
*/
CCSHASHKEY CFontCache::MakeHashKey(const CCharFormat *pCF)
{
CCSHASHKEY ccshashkey;
ccshashkey = pCF->_iFont | ((pCF->_dwEffects & 3) << 14);
ccshashkey |= pCF->_yHeight << 16;
return ccshashkey;
}
/*
* CFontCache::GetCcs(pCF, dypInch, yPixelsPerInch)
*
* @mfunc
* Search the font cache for a matching logical font and return it.
* If a match is not found in the cache, create one.
*
* @rdesc
* A logical font matching the given CHARFORMAT info.
*
* @devnote
* The calling chain must be protected by a CLock, since this present
* routine access the global (shared) FontCache facility.
*/
CCcs* CFontCache::GetCcs(
const CCharFormat *const pCF, //@parm description of desired logical font
const LONG dypInch, //@parm Y pixels per inch
HDC hdc, //@parm HDC font is to be created for
BOOL fForceTrueType) //@parm Force a TrueType font to be used
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CFontCache::GetCcs");
// display font
const CCcs * const pccsMost = &_rgccs[FONTCACHESIZE - 1];
CCcs * pccs;
CCSHASHKEY ccshashkey;
int iccsHash;
CCharFormat CF = *pCF;
if (fForceTrueType)
{
//On Win '9x Thai/Vietnamese, you cannot force truetype fonts! Therefore,
//we will force Tahoma if the font doesn't support the right charset.
if (W32->OnWin9x())
{
UINT acp = GetACP();
if (acp == 1258 || acp == 874)
{
DWORD fontsig = GetFontSignatureFromFace(CF._iFont);
if (CF._bCharSet == THAI_CHARSET && ((fontsig & fTHAI >> 8) == 0) ||
CF._bCharSet == VIETNAMESE_CHARSET && ((fontsig & fVIETNAMESE >> 8) == 0) ||
!g_fc->GetInfoFlags(pCF->_iFont).fTrueType)
{
CF._iFont = GetFontNameIndex(szTahoma);
}
}
}
else if (!g_fc->GetInfoFlags(pCF->_iFont).fTrueType)
CF._dwEffects |= CFE_TRUETYPEONLY;
}
if (hdc == NULL)
hdc = W32->GetScreenDC();
// Change CF._yHeight in the case of sub/superscript
if(CF._dwEffects & (CFE_SUPERSCRIPT | CFE_SUBSCRIPT))
CF._yHeight = 2*CF._yHeight/3;
//Convert CCharFormat into logical units (round)
CF._yHeight = (CF._yHeight * dypInch + LY_PER_INCH / 2) / LY_PER_INCH;
if (CF._yHeight == 0)
CF._yHeight = 1;
ccshashkey = MakeHashKey(&CF);
// Check our hash before going sequential.
iccsHash = ccshashkey % CCSHASHSEARCHSIZE;
if(ccshashkey == quickHashSearch[iccsHash].ccshashkey)
{
pccs = quickHashSearch[iccsHash].pccs;
if(pccs && pccs->_fValid)
{
if(pccs->Compare(&CF, hdc))
goto matched;
}
}
else //Setup this hash hint for next time
quickHashSearch[iccsHash].ccshashkey = ccshashkey;
// Sequentially search ccs for same character format
for(pccs = &_rgccs[0]; pccs <= pccsMost; pccs++)
{
if(pccs->_ccshashkey == ccshashkey && pccs->_fValid)
{
if(!pccs->Compare(&CF, hdc))
continue;
quickHashSearch[iccsHash].pccs = pccs;
matched:
//$ FUTURE: make this work even with wrap around of dwAgeNext
// Mark as most recently used if it isn't already in use.
if(pccs->_dwAge != _dwAgeNext - 1)
pccs->_dwAge = _dwAgeNext++;
pccs->_cRefs++; // bump up ref. count
return pccs;
}
}
// We did not find a match: init a new font cache.
pccs = GrabInitNewCcs(&CF, hdc);
quickHashSearch[iccsHash].pccs = pccs;
pccs->_ccshashkey = ccshashkey;
pccs->_fForceTrueType = (CF._dwEffects & CFE_TRUETYPEONLY) ? TRUE : FALSE;
return pccs;
}
/*
* CFontCache::GrabInitNewCcs(pCF)
*
* @mfunc
* create a logical font and store it in our cache.
*
* @rdesc
* New CCcs created
*/
CCcs* CFontCache::GrabInitNewCcs(
const CCharFormat * const pCF, //@parm description of desired logical font
HDC hdc)
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CFontCache::GrabInitNewCcs");
DWORD dwAgeOldest = 0xffffffff;
CCcs * pccs;
const CCcs * const pccsMost = &_rgccs[FONTCACHESIZE - 1];
CCcs * pccsOldest = NULL;
// Look for unused entry and oldest in use entry
for(pccs = &_rgccs[0]; pccs <= pccsMost && pccs->_fValid; pccs++)
if(pccs->_cRefs == 0 && pccs->_dwAge < dwAgeOldest)
{
dwAgeOldest = pccs->_dwAge;
pccsOldest = pccs;
}
if(pccs > pccsMost) // Didn't find an unused entry, use oldest entry
{
pccs = pccsOldest;
if(!pccs)
{
AssertSz(FALSE, "CFontCache::GrabInitNewCcs oldest entry is NULL");
return NULL;
}
}
// Initialize new CCcs
pccs->_hdc = hdc;
if(!pccs->Init(pCF))
return NULL;
pccs->_cRefs++;
return pccs;
}
// ============================= CCcs class ===================================================
/*
* BOOL CCcs::Init()
*
* @mfunc
* Init one font cache object. The global font cache stores
* individual CCcs objects.
*/
BOOL CCcs::Init (
const CCharFormat * const pCF) //@parm description of desired logical font
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CCcs::Init");
if(_fValid)
Free(); // recycle already in-use fonts.
if(MakeFont(pCF))
{
_iFont = pCF->_iFont;
_dwAge = g_fc->_dwAgeNext++;
_fValid = TRUE; // successfully created a new font cache.
}
return _fValid;
}
/*
* void CCcs::Free()
*
* @mfunc
* Free any dynamic memory allocated by an individual font's cache.
*/
void CCcs::Free()
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CCcs::Free");
Assert(_fValid);
_widths.Free();
if(_hfont)
DestroyFont();
if (_sc && g_pusp)
ScriptFreeCache(&_sc);
_fValid = FALSE;
_cRefs = 0;
}
/*
* CCcs::BestCharSet(bCharSet, bCharSetDefault)
*
* @mfunc
* This function returns the best charset that the currently selected font
* is capable of rendering. If the currently selected font cannot support
* the requested charset, then the function returns bCharSetDefault, which
* is generally taken from the charformat.
*
* @rdesc
* The closest charset to bCharSet that can be rendered by the current
* font.
*
* @devnote
* Currently this function is only used with plain text, however I don't
* believe there is any special reason it couldn't be used to improve
* rendering of rich text as well.
*/
BYTE CCcs::BestCharSet(BYTE bCharSet, BYTE bCharSetDefault, int fFontMatching)
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CCcs::BestCharSet");
// Does desired charset match currently selected charset or is it
// supported by the currently selected font?
if((bCharSet != _bCharSet || !bCharSet) &&
(fFontMatching == MATCH_CURRENT_CHARSET || !(_dwFontSig & GetFontSig(bCharSet))))
{
// If desired charset is not selected and we can't switch to it,
// switch to fallback charset (probably from backing store).
return bCharSetDefault;
}
// We already match desired charset, or it is supported by the font.
// Either way, we can just return the requested charset.
return bCharSet;
}
/*
* CCcs::FillWidth (ch, dxp)
*
* @mfunc
* Fill in this CCcs with metrics info for given device
*
* @rdesc
* TRUE if OK, FALSE if failed
*/
BOOL CCcs::FillWidth(
WCHAR ch, //@parm WCHAR character we need a width for.
LONG &dxp) //@parm the width of the character
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CCcs::FillWidths");
AssertSz(_hfont, "CCcs::Fill - CCcs has no font");
HFONT hfontOld = SelectFont(_hdc, _hfont);
BOOL fRes = _widths.FillWidth(_hdc, ch, _xOverhangAdjust, dxp, _wCodePage, _xAveCharWidth);
SelectFont(_hdc, hfontOld);
return fRes;
}
/*
* BOOL CCcs::MakeFont(pCF)
*
* @mfunc
* Wrapper, setup for CreateFontIndirect() to create the font to be
* selected into the HDC.
*
* @devnote The pCF here is in logical units
*
* @rdesc
* TRUE if OK, FALSE if allocation failure
*/
BOOL CCcs::MakeFont(
const CCharFormat * const pCF) //@parm description of desired logical font
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CCcs::MakeFont");
LOGFONT lf;
ZeroMemory(&lf, sizeof(lf));
_bCMDefault = pCF->_dwEffects & CFE_RUNISDBCS ? CVT_LOWBYTE : CVT_NONE;
_yHeightRequest = pCF->_yHeight;
_bCharSetRequest = pCF->_bCharSet;
lf.lfHeight = -_yHeightRequest;
if(pCF->_wWeight)
_weight = pCF->_wWeight;
else
_weight = (pCF->_dwEffects & CFE_BOLD) ? FW_BOLD : FW_NORMAL;
lf.lfWeight = _weight;
lf.lfItalic = _fItalic = (pCF->_dwEffects & CFE_ITALIC) != 0;
lf.lfCharSet = _bCMDefault == CVT_LOWBYTE ? ANSI_CHARSET : GetGdiCharSet(pCF->_bCharSet);
lf.lfOutPrecision = OUT_DEFAULT_PRECIS;
if (pCF->_dwEffects & CFE_TRUETYPEONLY)
{
lf.lfOutPrecision = OUT_TT_ONLY_PRECIS;
if (!W32->OnWin9x() && g_fc->GetInfoFlags(pCF->_iFont).fTrueType)
lf.lfOutPrecision = OUT_SCREEN_OUTLINE_PRECIS;
}
lf.lfClipPrecision = CLIP_DEFAULT_PRECIS | CLIP_DFA_OVERRIDE;
lf.lfPitchAndFamily = _bPitchAndFamily = pCF->_bPitchAndFamily;
// If family is virtual BiDi family (FF_BIDI), replace by FF_ROMAN
if((lf.lfPitchAndFamily & 0xF0) == (FF_BIDI << 4))
lf.lfPitchAndFamily = (FF_ROMAN << 4) | (lf.lfPitchAndFamily & 0xF);
// If the run is DBCS, that means the font's codepage is not available in
// this system. Use the English ANSI codepage instead so we will display
// ANSI characters correctly. NOTE: _wCodePage is only used for Win95.
_wCodePage = (WORD)GetCodePage(lf.lfCharSet);
wcscpy(lf.lfFaceName, GetFontName(pCF->_iFont));
// In BiDi system, always create ANSI bitmap font with system charset
BYTE bSysCharSet = W32->GetSysCharSet();
if (IsBiDiCharSet(bSysCharSet) && lf.lfCharSet == ANSI_CHARSET &&
fc().GetInfoFlags(pCF->_iFont).fBitmap &&
!fc().GetInfoFlags(pCF->_iFont).fBadFaceName)
lf.lfCharSet = bSysCharSet;
// Reader! A bundle of spagghetti code lies ahead of you!
// But go on boldly, for these spagghetti are seasoned with
// lots of comments, and ... good luck to you...
HFONT hfontOriginalCharset = NULL;
BYTE bOriginalCharset = lf.lfCharSet;
WCHAR szNewFaceName[LF_FACESIZE];
GetFontWithMetrics(&lf, szNewFaceName);
if(0 != wcsicmp(szNewFaceName, lf.lfFaceName))
{
BOOL fCorrectFont = FALSE;
if(lf.lfCharSet == SYMBOL_CHARSET)
{
// #1. if the face changed, and the specified charset was SYMBOL,
// but the face name exists and suports ANSI, we give preference
// to the face name
lf.lfCharSet = ANSI_CHARSET;
hfontOriginalCharset = _hfont;
GetFontWithMetrics(&lf, szNewFaceName);
if(0 == wcsicmp(szNewFaceName, lf.lfFaceName))
// That's right, ANSI is the asnwer
fCorrectFont = TRUE;
else
// No, fall back by default; the charset we got was right
lf.lfCharSet = bOriginalCharset;
}
else if(lf.lfCharSet == DEFAULT_CHARSET && _bCharSet == DEFAULT_CHARSET)
{
// #2. If we got the "default" font back, we don't know what it means
// (could be anything) so we veryfy that this guy's not SYMBOL
// (symbol is never default, but the OS could be lying to us!!!)
// we would like to veryfy more like whether it actually gave us
// Japanese instead of ANSI and labeled it "default"...
// but SYMBOL is the least we can do
lf.lfCharSet = SYMBOL_CHARSET;
wcscpy(lf.lfFaceName, szNewFaceName);
hfontOriginalCharset = _hfont;
GetFontWithMetrics(&lf, szNewFaceName);
if(0 == wcsicmp(szNewFaceName, lf.lfFaceName))
// That's right, it IS symbol!
// 'correct' the font to the 'true' one,
// and we'll get fMappedToSymbol
fCorrectFont = TRUE;
// Always restore the charset name, we didn't want to
// question the original choice of charset here
lf.lfCharSet = bOriginalCharset;
}
else if(lf.lfCharSet == ARABIC_CHARSET || lf.lfCharSet == HEBREW_CHARSET)
{
DestroyFont();
wcscpy(lf.lfFaceName, szNewFaceName);
GetFontWithMetrics(&lf, szNewFaceName);
fCorrectFont = TRUE;
}
else if(_bConvertMode != CVT_LOWBYTE && IsFECharSet(lf.lfCharSet)
&& !OnWinNTFE() && !W32->OnWin9xFE())
{
const WCHAR *pch = NULL;
if(_bCharSet != lf.lfCharSet && W32->OnWin9x())
{
// On Win95 when rendering to PS driver, we'll get something
// other than what we asked. So try a known font we got from GDI
switch (lf.lfCharSet)
{
case CHINESEBIG5_CHARSET:
pch = GetFontName(g_iFontBig5);
break;
case SHIFTJIS_CHARSET:
pch = GetFontName(g_iFontJapanese);
break;
case HANGEUL_CHARSET:
pch = GetFontName(g_iFontHangul);
break;
case GB2312_CHARSET:
pch = GetFontName(g_iFontGB2312);
break;
}
}
else // FE Font (from Lang pack)
pch = szNewFaceName; // on a nonFEsystem
if(pch)
wcscpy(lf.lfFaceName, pch);
hfontOriginalCharset = _hfont;
GetFontWithMetrics(&lf, szNewFaceName);
if(0 == wcsicmp(szNewFaceName, lf.lfFaceName))
{
// That's right, it IS the FE font we want!
// 'correct' the font to the 'true' one.
fCorrectFont = TRUE;
if(W32->OnWin9x())
{
// Save up the GDI font names for later printing use
switch(lf.lfCharSet)
{
case CHINESEBIG5_CHARSET:
g_iFontBig5 = GetFontNameIndex(lf.lfFaceName);
break;
case SHIFTJIS_CHARSET:
g_iFontJapanese = GetFontNameIndex(lf.lfFaceName);
break;
case HANGEUL_CHARSET:
g_iFontHangul = GetFontNameIndex(lf.lfFaceName);
break;
case GB2312_CHARSET:
g_iFontGB2312 = GetFontNameIndex(lf.lfFaceName);
break;
}
}
}
}
if(hfontOriginalCharset)
{
// Either keep old font or new one
if(fCorrectFont)
{
SideAssert(DeleteObject(hfontOriginalCharset));
}
else
{
// Fall back to original font
DestroyFont();
_hfont = hfontOriginalCharset;
GetMetrics();
}
hfontOriginalCharset = NULL;
}
}
RetryCreateFont:
{
// Could be that we just plain simply get mapped to symbol.
// Avoid it
BOOL fMappedToSymbol = (_bCharSet == SYMBOL_CHARSET &&
lf.lfCharSet != SYMBOL_CHARSET);
BOOL fChangedCharset = (_bCharSet != lf.lfCharSet &&
lf.lfCharSet != DEFAULT_CHARSET);
if(fChangedCharset || fMappedToSymbol)
{
// Here, the system did not preserve the font language or mapped
// our non-symbol font onto a symbol font, which will look awful
// when displayed. Giving us a symbol font when we asked for a
// non-symbol font (default can never be symbol) is very bizarre
// and means that either the font name is not known or the system
// has gone complete nuts. The charset language takes priority
// over the font name. Hence, I would argue that nothing can be
// done to save the situation at this point, and we have to
// delete the font name and retry.
if (fChangedCharset && lf.lfCharSet == THAI_CHARSET && _bCharSet == ANSI_CHARSET)
{
// We have charset substitution entries in Thai platforms that
// will substitute all the core fonts with THAI_CHARSET to
// ANSI_CHARSET. This is because we dont have Thai in such fonts.
// Here we'll internally substitute the core font to Thai default
// font so it matches its underlying THAI_CHARSET request (wchao).
SHORT iDefFont;
BYTE yDefHeight;
BYTE bDefPaf;
W32->GetPreferredFontInfo(874, TRUE, iDefFont, (BYTE&)yDefHeight, bDefPaf);
const WCHAR* szThaiDefault = GetFontName(iDefFont);
if (szThaiDefault)
{
DestroyFont();
wcscpy(lf.lfFaceName, szThaiDefault);
GetFontWithMetrics(&lf, szNewFaceName);
goto GetOutOfHere;
}
}
if(!wcsicmp(lf.lfFaceName, szFontOfChoice))
{
// We've been here already; no font with an appropriate
// charset is on the system. Try getting the ANSI one for
// the original font name. Next time around, we'll null
// out the name as well!!
if (lf.lfCharSet == ANSI_CHARSET)
{
TRACEINFOSZ("Asking for ANSI ARIAL and not getting it?!");
// Those Win95 guys have definitely outbugged me
goto GetOutOfHere;
}
DestroyFont();
wcscpy(lf.lfFaceName, GetFontName(pCF->_iFont));
lf.lfCharSet = ANSI_CHARSET;
}
else
{
DestroyFont();
wcscpy(lf.lfFaceName, szFontOfChoice);
}
GetFontWithMetrics(&lf, szNewFaceName);
goto RetryCreateFont;
}
}
GetOutOfHere:
if (hfontOriginalCharset)
SideAssert(DeleteObject(hfontOriginalCharset));
// If we're really really stuck, just get the system font and hope for the best.
if(!_hfont)
_hfont = W32->GetSystemFont();
Assert(_hfont);
// Cache essential FONTSIGNATURE and GetFontLanguageInfo() information
_dwFontSig = 0;
if(_hfont)
{
CHARSETINFO csi;
HFONT hfontOld = SelectFont(_hdc, _hfont);
UINT uCharSet;
// Try to get FONTSIGNATURE data
uCharSet = GetTextCharsetInfo(_hdc, &(csi.fs), 0);
if(!(csi.fs.fsCsb[0] | csi.fs.fsCsb[1] | csi.fs.fsUsb[0]))
{
// We should only get here if the font is non-TrueType; See
// GetTextCharsetInfo() for details. In this case we use
// TranslateCharsetInfo() to fill in the data for us.
TranslateCharsetInfo((DWORD *)(DWORD_PTR)uCharSet, &csi, TCI_SRCCHARSET);
}
// Cache ANSI code pages supported by this font
_dwFontSig = csi.fs.fsCsb[0];
SelectFont(_hdc, hfontOld);
}
return TRUE;
}
/*
* HFONT CCcs::GetFontWithMetrics (szNewFaceName)
*
* @mfunc
* Get metrics used by the measurer and renderer and the new face name.
*
* @rdesc
* HFONT if successful
*/
HFONT CCcs::GetFontWithMetrics (LOGFONT *plf,
WCHAR* szNewFaceName)
{
_hfont = CreateFontIndirect(plf);
if(_hfont)
GetMetrics(szNewFaceName);
return (_hfont);
}
/*
* CCcs::GetOffset(pCF, lZoomNumerator, lZoomDenominator, pyOffset, pyAdjust);
*
* @mfunc
* Return the offset information for
*
* @rdesc
* void
*
* @comm
* Return the offset value (used in line height calculations)
* and the amount to raise or lower the text because of superscript
* or subscript considerations.
*/
void CCcs::GetOffset(const CCharFormat * const pCF, LONG dypInch,
LONG *pyOffset, LONG *pyAdjust)
{
*pyOffset = 0;
*pyAdjust = 0;
if (pCF->_yOffset)
*pyOffset = MulDiv(pCF->_yOffset, dypInch, LY_PER_INCH);
if (pCF->_dwEffects & CFE_SUPERSCRIPT)
*pyAdjust = _yOffsetSuperscript;
else if (pCF->_dwEffects & CFE_SUBSCRIPT)
*pyAdjust = _yOffsetSubscript;
}
/*
* BOOL CCcs::GetMetrics()
*
* @mfunc
* Get metrics used by the measurer and renderer.
*
* @rdesc
* TRUE if successful
*
* @comm
* These are in logical coordinates which are dependent
* on the mapping mode and font selected into the hdc.
*/
BOOL CCcs::GetMetrics(WCHAR *szNewFaceName)
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CCcs::GetMetrics");
HFONT hfontOld;
BOOL fRes = TRUE;
TEXTMETRIC tm;
if (szNewFaceName)
*szNewFaceName = 0;
AssertSz(_hfont, "No font has been created.");
hfontOld = SelectFont(_hdc, _hfont);
if(!hfontOld)
{
DestroyFont();
return FALSE;
}
if (szNewFaceName)
GetTextFace(_hdc, LF_FACESIZE, szNewFaceName);
if(!GetTextMetrics(_hdc, &tm))
{
SelectFont(_hdc, hfontOld);
DestroyFont();
return FALSE;
}
// the metrics, in logical units, dependent on the map mode and font.
_yHeight = (SHORT) tm.tmHeight;
_yDescent = (SHORT) tm.tmDescent;
_xAveCharWidth = (SHORT) tm.tmAveCharWidth;
_xOverhangAdjust= (SHORT) tm.tmOverhang;
//FUTURE (keithcu) Get these metrics from the font.
//FUTURE (keithcu) The height of the line if the font is superscript
//should be the NORMAL height of the text.
_yOffsetSuperscript = _yHeight * 2 / 5;
_yOffsetSubscript = -_yDescent * 3 / 5;
_xOverhang = 0;
_xUnderhang = 0;
if(_fItalic)
{
_xOverhang = SHORT((tm.tmAscent + 1) >> 2);
_xUnderhang = SHORT((tm.tmDescent + 1) >> 2);
}
// if fix pitch, the tm bit is clear
_fFixPitchFont = !(TMPF_FIXED_PITCH & tm.tmPitchAndFamily);
_bCharSet = tm.tmCharSet;
_fFECharSet = IsFECharSet(_bCharSet);
// Use convert-mode proposed by CF, for which we are creating the font and
// then tweak as necessary below.
_bConvertMode = _bCMDefault;
// If SYMBOL_CHARSET is used, use the A APIs with the low bytes of the
// characters in the run
if(_bCharSet == SYMBOL_CHARSET)
_bConvertMode = CVT_LOWBYTE;
else if (_bConvertMode == CVT_NONE)
_bConvertMode = W32->DetermineConvertMode(_hdc, tm.tmCharSet );
W32->CalcUnderlineInfo(_hdc, this, &tm);
SelectFont(_hdc, hfontOld);
return fRes;
}
/*
* CCcs::DestroyFont()
*
* @mfunc
* Destroy font handle for this CCcs
*/
void CCcs::DestroyFont()
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CCcs::DestroyFont");
// clear out any old font
if(_hfont)
{
SideAssert(DeleteObject(_hfont));
_hfont = 0;
}
}
/*
* CCcs::Compare (pCF, lfHeight)
*
* @mfunc
* Compares this font cache with the font properties of a
* given CHARFORMAT
* @devnote The pCF size here is in logical units
*
* @rdesc
* FALSE iff did not match exactly.
*/
BOOL CCcs::Compare (
const CCharFormat * const pCF, //@parm Description of desired font
HDC hdc)
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CCcs::Compare");
BOOL result =
_iFont == pCF->_iFont &&
_yHeightRequest == pCF->_yHeight &&
(_bCharSetRequest == pCF->_bCharSet || _bCharSet == pCF->_bCharSet) &&
_weight == pCF->_wWeight &&
_fForceTrueType == ((pCF->_dwEffects & CFE_TRUETYPEONLY) ? TRUE : FALSE) &&
_fItalic == ((pCF->_dwEffects & CFE_ITALIC) != 0) &&
_hdc == hdc &&
_bPitchAndFamily == pCF->_bPitchAndFamily &&
(!(pCF->_dwEffects & CFE_RUNISDBCS) || _bConvertMode == CVT_LOWBYTE);
return result;
}
// ========================= WidthCache by jonmat =========================
/*
* CWidthCache::CheckWidth(ch, dxp)
*
* @mfunc
* check to see if we have a width for a WCHAR character.
*
* @comm
* Used prior to calling FillWidth(). Since FillWidth
* may require selecting the map mode and font in the HDC,
* checking here first saves time.
*
* @comm
* Statistics are maintained to determine when to
* expand the cache. The determination is made after a constant
* number of calls in order to make calculations faster.
*
* @rdesc
* returns TRUE if we have the width of the given WCHAR.
*/
BOOL CWidthCache::CheckWidth (
const WCHAR ch, //@parm char, can be Unicode, to check width for.
LONG &dxp) //@parm Width of character
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CWidthCache::CheckWidth");
BOOL fExist;
//30,000 FE characters all have the same width
if (FLookasideCharacter(ch))
{
FetchLookasideWidth(ch, dxp);
return dxp != 0;
}
const CacheEntry * pWidthData = GetEntry ( ch );
fExist = (ch == pWidthData->ch // Have we fetched the width?
&& pWidthData->width); // only because we may have ch == 0.
dxp = fExist ? pWidthData->width : 0;
if(!_fMaxPerformance) // if we have not grown to the max...
{
_accesses++;
if(!fExist) // Only interesting on collision.
{
if(0 == pWidthData->width) // Test width not ch, 0 is valid ch.
{
_cacheUsed++; // Used another entry.
AssertSz( _cacheUsed <= _cacheSize+1, "huh?");
}
else
_collisions++; // We had a collision.
if(_accesses >= PERFCHECKEPOCH)
CheckPerformance(); // After some history, tune cache.
}
}
#ifdef DEBUG // Continue to monitor performance
else
{
_accesses++;
if(!fExist) // Only interesting on collision.
{
if(0 == pWidthData->width) // Test width not ch, 0 is valid ch.
{
_cacheUsed++; // Used another entry.
AssertSz( _cacheUsed <= _cacheSize+1, "huh?");
}
else
_collisions++; // We had a collision.
}
if(_accesses > PERFCHECKEPOCH)
{
_accesses = 0;
_collisions = 0;
}
}
#endif
return fExist;
}
/*
* CWidthCache::CheckPerformance()
*
* @mfunc
* check performance and increase cache size if deemed necessary.
*
* @devnote
* To calculate 25% collision rate, we make use of the fact that
* we are only called once every 64 accesses. The inequality is
* 100 * collisions / accesses >= 25. By converting from 100ths to
* 8ths, the ineqaulity becomes (collisions << 3) / accesses >= 2.
* Substituting 64 for accesses, this becomes (collisions >> 3) >= 2.
*/
void CWidthCache::CheckPerformance()
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CWidthCache::CheckPerformance");
if(_fMaxPerformance) // Exit if already grown to our max.
return;
// Grow the cache when cacheSize > 0 && 75% utilized or approx 25%
// collision rate
if (_cacheSize > DEFAULTCACHESIZE &&
(_cacheSize >> 1) + (_cacheSize >> 2) < _cacheUsed ||
(_collisions >> COLLISION_SHIFT) >= 2)
{
GrowCache( &_pWidthCache, &_cacheSize, &_cacheUsed );
}
_collisions = 0; // This prevents wraps but makes
_accesses = 0; // calc a local rate, not global.
if(_cacheSize >= maxCacheSize)// Note if we've max'ed out
_fMaxPerformance = TRUE;
AssertSz( _cacheSize <= maxCacheSize, "max must be 2^n-1");
AssertSz( _cacheUsed <= _cacheSize+1, "huh?");
}
/*
* CWidthCache::GrowCache(ppWidthCache, pCacheSize, pCacheUsed)
*
* @mfunc
* Exponentially expand the size of the cache.
*
* @comm
* The cache size must be of the form 2^n as we use a
* logical & to get the hash MOD by storing 2^n-1 as
* the size and using this as the modulo.
*
* @rdesc
* Returns TRUE if we were able to allocate the new cache.
* All in params are also out params.
*
*/
BOOL CWidthCache::GrowCache(
CacheEntry **ppWidthCache, //@parm cache
INT * pCacheSize, //@parm cache's respective size.
INT * pCacheUsed) //@parm cache's respective utilization.
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CWidthCache::GrowCache");
CacheEntry *pNewWidthCache, *pOldWidthCache, *pWidthData;
INT j, newCacheSize, newCacheUsed;
WCHAR ch;
j = *pCacheSize; // Allocate cache of 2^n.
newCacheSize = max ( INITIALCACHESIZE, (j << 1) + 1);
pNewWidthCache = (CacheEntry *)
PvAlloc( sizeof(CacheEntry) * (newCacheSize + 1 ), GMEM_ZEROINIT);
if(pNewWidthCache)
{
newCacheUsed = 0;
*pCacheSize = newCacheSize; // Update out params.
pOldWidthCache = *ppWidthCache;
*ppWidthCache = pNewWidthCache;
for (; j >= 0; j--) // Move old cache info to new.
{
ch = pOldWidthCache[j].ch;
if ( ch )
{
pWidthData = &pNewWidthCache [ch & newCacheSize];
if ( 0 == pWidthData->ch )
newCacheUsed++; // Used another entry.
pWidthData->ch = ch;
pWidthData->width = pOldWidthCache[j].width;
}
}
*pCacheUsed = newCacheUsed; // Update out param.
// Free old cache.
if (pOldWidthCache < &_defaultWidthCache[0] ||
pOldWidthCache >= &_defaultWidthCache[DEFAULTCACHESIZE+1])
{
FreePv(pOldWidthCache);
}
}
return NULL != pNewWidthCache;
}
/*
* CWidthCache::FillWidth(hdc, ch, xOverhang, dxp)
*
* @mfunc
* Call GetCharWidth() to obtain the width of the given char.
*
* @comm
* The HDC must be setup with the mapping mode and proper font
* selected *before* calling this routine.
*
* @rdesc
* Returns TRUE if we were able to obtain the widths.
*/
BOOL CWidthCache::FillWidth(
HDC hdc, //@parm Current HDC we want font info for.
const WCHAR ch, //@parm Char to obtain width for.
const SHORT xOverhang, //@parm Equivalent to GetTextMetrics() tmOverhang.
LONG & dxp, //@parm Width of character
UINT uiCodePage, //@parm code page for text
INT iDefWidth) //@parm Default width to use if font calc's zero
//width. (Handles Win95 problem).
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CWidthCache::FillWidth");
if (FLookasideCharacter(ch))
{
SHORT *pdxp = IN_RANGE(0xAC00, ch, 0xD79F) ? &_dxpHangul : &_dxpHan;
W32->REGetCharWidth(hdc, ch, pdxp, uiCodePage, xOverhang, iDefWidth);
dxp = *pdxp;
return TRUE;
}
CacheEntry * pWidthData = GetEntry (ch);
W32->REGetCharWidth(hdc, ch, &pWidthData->width, uiCodePage, xOverhang, iDefWidth);
pWidthData->ch = ch;
dxp = pWidthData->width;
return TRUE;
}
/*
* CWidthCache::Free()
*
* @mfunc
* Free any dynamic memory allocated by the width cache and prepare
* it to be recycled.
*/
void CWidthCache::Free()
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CWidthCache::Free");
_fMaxPerformance = FALSE;
_dxpHangul = _dxpHan = 0;
_cacheSize = DEFAULTCACHESIZE;
_cacheUsed = 0;
_collisions = 0;
_accesses = 0;
if(_pWidthCache != &_defaultWidthCache[0])
{
FreePv(_pWidthCache);
_pWidthCache = &_defaultWidthCache[0];
}
ZeroMemory(_pWidthCache, sizeof(CacheEntry)*(DEFAULTCACHESIZE + 1));
}
/*
* CWidthCache::CWidthCache()
*
* @mfunc
* Point the caches to the defaults.
*/
CWidthCache::CWidthCache()
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CWidthCache::CWidthCache");
_pWidthCache = &_defaultWidthCache[0];
}
/*
* CWidthCache::~CWidthCache()
*
* @mfunc
* Free any allocated caches.
*/
CWidthCache::~CWidthCache()
{
TRACEBEGIN(TRCSUBSYSFONT, TRCSCOPEINTERN, "CWidthCache::~CWidthCache");
if (_pWidthCache != &_defaultWidthCache[0])
FreePv(_pWidthCache);
}
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