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-rw-r--r--vcl/source/font/fontcharmap.cxx639
1 files changed, 639 insertions, 0 deletions
diff --git a/vcl/source/font/fontcharmap.cxx b/vcl/source/font/fontcharmap.cxx
new file mode 100644
index 000000000..7ca3e56a2
--- /dev/null
+++ b/vcl/source/font/fontcharmap.cxx
@@ -0,0 +1,639 @@
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#include <vcl/fontcharmap.hxx>
+#include <impfontcharmap.hxx>
+#include <rtl/textcvt.h>
+#include <rtl/textenc.h>
+#include <sal/log.hxx>
+
+#include <algorithm>
+#include <vector>
+#include <o3tl/sorted_vector.hxx>
+
+CmapResult::CmapResult( bool bSymbolic,
+ const sal_UCS4* pRangeCodes, int nRangeCount )
+: mpRangeCodes( pRangeCodes)
+, mpStartGlyphs( nullptr)
+, mpGlyphIds( nullptr)
+, mnRangeCount( nRangeCount)
+, mbSymbolic( bSymbolic)
+, mbRecoded( false)
+{}
+
+static ImplFontCharMapRef g_pDefaultImplFontCharMap;
+const sal_UCS4 aDefaultUnicodeRanges[] = {0x0020,0xD800, 0xE000,0xFFF0};
+const sal_UCS4 aDefaultSymbolRanges[] = {0x0020,0x0100, 0xF020,0xF100};
+
+ImplFontCharMap::~ImplFontCharMap()
+{
+ if( !isDefaultMap() )
+ {
+ delete[] mpRangeCodes;
+ delete[] mpStartGlyphs;
+ delete[] mpGlyphIds;
+ }
+}
+
+ImplFontCharMap::ImplFontCharMap( const CmapResult& rCR )
+: mpRangeCodes( rCR.mpRangeCodes )
+, mpStartGlyphs( rCR.mpStartGlyphs )
+, mpGlyphIds( rCR.mpGlyphIds )
+, mnRangeCount( rCR.mnRangeCount )
+, mnCharCount( 0 )
+ , m_bSymbolic(rCR.mbSymbolic)
+{
+ const sal_UCS4* pRangePtr = mpRangeCodes;
+ for( int i = mnRangeCount; --i >= 0; pRangePtr += 2 )
+ {
+ sal_UCS4 cFirst = pRangePtr[0];
+ sal_UCS4 cLast = pRangePtr[1];
+ mnCharCount += cLast - cFirst;
+ }
+}
+
+ImplFontCharMapRef const & ImplFontCharMap::getDefaultMap( bool bSymbols )
+{
+ const sal_UCS4* pRangeCodes = aDefaultUnicodeRanges;
+ int nCodesCount = std::size(aDefaultUnicodeRanges);
+ if( bSymbols )
+ {
+ pRangeCodes = aDefaultSymbolRanges;
+ nCodesCount = std::size(aDefaultSymbolRanges);
+ }
+
+ CmapResult aDefaultCR( bSymbols, pRangeCodes, nCodesCount/2 );
+ g_pDefaultImplFontCharMap = ImplFontCharMapRef(new ImplFontCharMap(aDefaultCR));
+
+ return g_pDefaultImplFontCharMap;
+}
+
+bool ImplFontCharMap::isDefaultMap() const
+{
+ const bool bIsDefault = (mpRangeCodes == aDefaultUnicodeRanges) || (mpRangeCodes == aDefaultSymbolRanges);
+ return bIsDefault;
+}
+
+static unsigned GetUInt( const unsigned char* p ) { return((p[0]<<24)+(p[1]<<16)+(p[2]<<8)+p[3]);}
+static unsigned GetUShort( const unsigned char* p ){ return((p[0]<<8) | p[1]);}
+static int GetSShort( const unsigned char* p ){ return static_cast<sal_Int16>((p[0]<<8)|p[1]);}
+
+// TODO: move CMAP parsing directly into the ImplFontCharMap class
+bool ParseCMAP( const unsigned char* pCmap, int nLength, CmapResult& rResult )
+{
+ rResult.mpRangeCodes = nullptr;
+ rResult.mpStartGlyphs= nullptr;
+ rResult.mpGlyphIds = nullptr;
+ rResult.mnRangeCount = 0;
+ rResult.mbRecoded = false;
+ rResult.mbSymbolic = false;
+
+ // parse the table header and check for validity
+ if( !pCmap || (nLength < 24) )
+ return false;
+
+ if( GetUShort( pCmap ) != 0x0000 ) // simple check for CMAP corruption
+ return false;
+
+ int nSubTables = GetUShort( pCmap + 2 );
+ if( (nSubTables <= 0) || (nSubTables > (nLength - 24) / 8) )
+ return false;
+
+ const unsigned char* pEndValidArea = pCmap + nLength;
+
+ // find the most interesting subtable in the CMAP
+ rtl_TextEncoding eRecodeFrom = RTL_TEXTENCODING_UNICODE;
+ int nOffset = 0;
+ int nFormat = -1;
+ int nBestVal = 0;
+ for( const unsigned char* p = pCmap + 4; --nSubTables >= 0; p += 8 )
+ {
+ int nPlatform = GetUShort( p );
+ int nEncoding = GetUShort( p+2 );
+ int nPlatformEncoding = (nPlatform << 8) + nEncoding;
+
+ int nValue;
+ rtl_TextEncoding eTmpEncoding = RTL_TEXTENCODING_UNICODE;
+ switch( nPlatformEncoding )
+ {
+ case 0x000: nValue = 20; break; // Unicode 1.0
+ case 0x001: nValue = 21; break; // Unicode 1.1
+ case 0x002: nValue = 22; break; // iso10646_1993
+ case 0x003: nValue = 23; break; // UCS-2
+ case 0x004: nValue = 24; break; // UCS-4
+ case 0x100: nValue = 22; break; // Mac Unicode<2.0
+ case 0x103: nValue = 23; break; // Mac Unicode>2.0
+ case 0x300: nValue = 5; rResult.mbSymbolic = true; break; // Win Symbol
+ case 0x301: nValue = 28; break; // Win UCS-2
+ case 0x30A: nValue = 29; break; // Win-UCS-4
+ case 0x302: nValue = 11; eTmpEncoding = RTL_TEXTENCODING_SHIFT_JIS; break;
+ case 0x303: nValue = 12; eTmpEncoding = RTL_TEXTENCODING_GB_18030; break;
+ case 0x304: nValue = 11; eTmpEncoding = RTL_TEXTENCODING_BIG5; break;
+ case 0x305: nValue = 11; eTmpEncoding = RTL_TEXTENCODING_MS_949; break;
+ case 0x306: nValue = 11; eTmpEncoding = RTL_TEXTENCODING_MS_1361; break;
+ default: nValue = 0; break;
+ }
+
+ if( nValue <= 0 ) // ignore unknown encodings
+ continue;
+
+ int nTmpOffset = GetUInt( p+4 );
+
+ if (nTmpOffset > nLength - 2 || nTmpOffset < 0)
+ continue;
+
+ int nTmpFormat = GetUShort( pCmap + nTmpOffset );
+ if( nTmpFormat == 12 ) // 32bit code -> glyph map format
+ nValue += 3;
+ else if( nTmpFormat != 4 ) // 16bit code -> glyph map format
+ continue; // ignore other formats
+
+ if( nBestVal < nValue )
+ {
+ nBestVal = nValue;
+ nOffset = nTmpOffset;
+ nFormat = nTmpFormat;
+ eRecodeFrom = eTmpEncoding;
+ }
+ }
+
+ // parse the best CMAP subtable
+ int nRangeCount = 0;
+ sal_UCS4* pCodePairs = nullptr;
+ int* pStartGlyphs = nullptr;
+
+ std::vector<sal_uInt16> aGlyphIdArray;
+ aGlyphIdArray.reserve( 0x1000 );
+ aGlyphIdArray.push_back( 0 );
+
+ // format 4, the most common 16bit char mapping table
+ if( (nFormat == 4) && ((nOffset+16) < nLength) )
+ {
+ int nSegCountX2 = GetUShort( pCmap + nOffset + 6 );
+ nRangeCount = nSegCountX2/2 - 1;
+ if (nRangeCount < 0)
+ {
+ SAL_WARN("vcl.gdi", "negative RangeCount");
+ nRangeCount = 0;
+ }
+
+ const unsigned char* pLimitBase = pCmap + nOffset + 14;
+ const unsigned char* pBeginBase = pLimitBase + nSegCountX2 + 2;
+ const unsigned char* pDeltaBase = pBeginBase + nSegCountX2;
+ const unsigned char* pOffsetBase = pDeltaBase + nSegCountX2;
+
+ const int nOffsetBaseStart = pOffsetBase - pCmap;
+ const int nRemainingLen = nLength - nOffsetBaseStart;
+ const int nMaxPossibleRangeOffsets = nRemainingLen / 2;
+ if (nRangeCount > nMaxPossibleRangeOffsets)
+ {
+ SAL_WARN("vcl.gdi", "more range offsets requested then space available");
+ nRangeCount = std::max(0, nMaxPossibleRangeOffsets);
+ }
+
+ pCodePairs = new sal_UCS4[ nRangeCount * 2 ];
+ pStartGlyphs = new int[ nRangeCount ];
+
+ sal_UCS4* pCP = pCodePairs;
+ for( int i = 0; i < nRangeCount; ++i )
+ {
+ const sal_UCS4 cMinChar = GetUShort( pBeginBase + 2*i );
+ const sal_UCS4 cMaxChar = GetUShort( pLimitBase + 2*i );
+ const int nGlyphDelta = GetSShort( pDeltaBase + 2*i );
+ const int nRangeOffset = GetUShort( pOffsetBase + 2*i );
+ if( cMinChar > cMaxChar ) { // no sane font should trigger this
+ SAL_WARN("vcl.gdi", "Min char should never be more than the max char!");
+ break;
+ }
+ if( cMaxChar == 0xFFFF ) {
+ SAL_WARN("vcl.gdi", "Format 4 char should not be 0xFFFF");
+ break;
+ }
+ if( !nRangeOffset ) {
+ // glyphid can be calculated directly
+ pStartGlyphs[i] = (cMinChar + nGlyphDelta) & 0xFFFF;
+ } else {
+ // update the glyphid-array with the glyphs in this range
+ pStartGlyphs[i] = -static_cast<int>(aGlyphIdArray.size());
+ const unsigned char* pGlyphIdPtr = pOffsetBase + 2*i + nRangeOffset;
+ const size_t nRemainingSize = pEndValidArea >= pGlyphIdPtr ? pEndValidArea - pGlyphIdPtr : 0;
+ const size_t nMaxPossibleRecords = nRemainingSize/2;
+ if (nMaxPossibleRecords == 0) { // no sane font should trigger this
+ SAL_WARN("vcl.gdi", "More indexes claimed that space available in font!");
+ break;
+ }
+ const size_t nMaxLegalChar = cMinChar + nMaxPossibleRecords-1;
+ if (cMaxChar > nMaxLegalChar) { // no sane font should trigger this
+ SAL_WARN("vcl.gdi", "More indexes claimed that space available in font!");
+ break;
+ }
+ for( sal_UCS4 c = cMinChar; c <= cMaxChar; ++c, pGlyphIdPtr+=2 ) {
+ const int nGlyphIndex = GetUShort( pGlyphIdPtr ) + nGlyphDelta;
+ aGlyphIdArray.push_back( static_cast<sal_uInt16>(nGlyphIndex) );
+ }
+ }
+ *(pCP++) = cMinChar;
+ *(pCP++) = cMaxChar + 1;
+ }
+ nRangeCount = (pCP - pCodePairs) / 2;
+ }
+ // format 12, the most common 32bit char mapping table
+ else if( (nFormat == 12) && ((nOffset+16) < nLength) )
+ {
+ nRangeCount = GetUInt( pCmap + nOffset + 12 );
+ if (nRangeCount < 0)
+ {
+ SAL_WARN("vcl.gdi", "negative RangeCount");
+ nRangeCount = 0;
+ }
+
+ const int nGroupOffset = nOffset + 16;
+ const int nRemainingLen = nLength - nGroupOffset;
+ const int nMaxPossiblePairs = nRemainingLen / 12;
+ if (nRangeCount > nMaxPossiblePairs)
+ {
+ SAL_WARN("vcl.gdi", "more code pairs requested then space available");
+ nRangeCount = std::max(0, nMaxPossiblePairs);
+ }
+
+ pCodePairs = new sal_UCS4[ nRangeCount * 2 ];
+ pStartGlyphs = new int[ nRangeCount ];
+
+ const unsigned char* pGroup = pCmap + nGroupOffset;
+ sal_UCS4* pCP = pCodePairs;
+ for( int i = 0; i < nRangeCount; ++i )
+ {
+ sal_UCS4 cMinChar = GetUInt( pGroup + 0 );
+ sal_UCS4 cMaxChar = GetUInt( pGroup + 4 );
+ int nGlyphId = GetUInt( pGroup + 8 );
+ pGroup += 12;
+
+ if( cMinChar > cMaxChar ) { // no sane font should trigger this
+ SAL_WARN("vcl.gdi", "Min char should never be more than the max char!");
+ break;
+ }
+
+ *(pCP++) = cMinChar;
+ *(pCP++) = cMaxChar + 1;
+ pStartGlyphs[i] = nGlyphId;
+ }
+ nRangeCount = (pCP - pCodePairs) / 2;
+ }
+
+ // check if any subtable resulted in something usable
+ if( nRangeCount <= 0 )
+ {
+ delete[] pCodePairs;
+ delete[] pStartGlyphs;
+
+ // even when no CMAP is available we know it for symbol fonts
+ if( rResult.mbSymbolic )
+ {
+ pCodePairs = new sal_UCS4[4];
+ pCodePairs[0] = 0x0020; // aliased symbols
+ pCodePairs[1] = 0x0100;
+ pCodePairs[2] = 0xF020; // original symbols
+ pCodePairs[3] = 0xF100;
+ rResult.mpRangeCodes = pCodePairs;
+ rResult.mnRangeCount = 2;
+ return true;
+ }
+
+ return false;
+ }
+
+ // recode the code ranges to their unicode encoded ranges if needed
+ rtl_TextToUnicodeConverter aConverter = nullptr;
+ rtl_UnicodeToTextContext aCvtContext = nullptr;
+
+ rResult.mbRecoded = ( eRecodeFrom != RTL_TEXTENCODING_UNICODE );
+ if( rResult.mbRecoded )
+ {
+ aConverter = rtl_createTextToUnicodeConverter( eRecodeFrom );
+ aCvtContext = rtl_createTextToUnicodeContext( aConverter );
+ }
+
+ if( aConverter && aCvtContext )
+ {
+ // determine the set of supported code points from encoded ranges
+ o3tl::sorted_vector<sal_UCS4> aSupportedCodePoints;
+ aSupportedCodePoints.reserve(256);
+
+ static const int NINSIZE = 64;
+ static const int NOUTSIZE = 64;
+ std::vector<char> cCharsInp;
+ cCharsInp.reserve(NINSIZE);
+ sal_Unicode cCharsOut[ NOUTSIZE ];
+ sal_UCS4* pCP = pCodePairs;
+ for( int i = 0; i < nRangeCount; ++i )
+ {
+ sal_UCS4 cMin = *(pCP++);
+ sal_UCS4 cEnd = *(pCP++);
+ // ofz#25868 the conversion only makes sense with
+ // input codepoints in 0..SAL_MAX_UINT16 range
+ while (cMin < cEnd && cMin <= SAL_MAX_UINT16)
+ {
+ for (int j = 0; (cMin < cEnd) && (j < NINSIZE); ++cMin, ++j)
+ {
+ if( cMin >= 0x0100 )
+ cCharsInp.push_back(static_cast<char>(cMin >> 8));
+ if( (cMin >= 0x0100) || (cMin < 0x00A0) )
+ cCharsInp.push_back(static_cast<char>(cMin));
+ }
+
+ sal_uInt32 nCvtInfo;
+ sal_Size nSrcCvtBytes;
+ int nOutLen = rtl_convertTextToUnicode(
+ aConverter, aCvtContext,
+ cCharsInp.data(), cCharsInp.size(), cCharsOut, NOUTSIZE,
+ RTL_TEXTTOUNICODE_FLAGS_INVALID_IGNORE
+ | RTL_TEXTTOUNICODE_FLAGS_UNDEFINED_IGNORE,
+ &nCvtInfo, &nSrcCvtBytes );
+
+ cCharsInp.clear();
+
+ for (int j = 0; j < nOutLen; ++j)
+ aSupportedCodePoints.insert( cCharsOut[j] );
+ }
+ }
+
+ rtl_destroyTextToUnicodeConverter( aCvtContext );
+ rtl_destroyTextToUnicodeConverter( aConverter );
+
+ // convert the set of supported code points to ranges
+ std::vector<sal_UCS4> aSupportedRanges;
+
+ for (auto const& supportedPoint : aSupportedCodePoints)
+ {
+ if( aSupportedRanges.empty()
+ || (aSupportedRanges.back() != supportedPoint) )
+ {
+ // add new range beginning with current unicode
+ aSupportedRanges.push_back(supportedPoint);
+ aSupportedRanges.push_back( 0 );
+ }
+
+ // extend existing range to include current unicode
+ aSupportedRanges.back() = supportedPoint + 1;
+ }
+
+ // glyph mapping for non-unicode fonts not implemented
+ delete[] pStartGlyphs;
+ pStartGlyphs = nullptr;
+ aGlyphIdArray.clear();
+
+ // make a pCodePairs array using the vector from above
+ delete[] pCodePairs;
+ nRangeCount = aSupportedRanges.size() / 2;
+ if( nRangeCount <= 0 )
+ return false;
+ pCodePairs = new sal_UCS4[ nRangeCount * 2 ];
+ pCP = pCodePairs;
+ for (auto const& supportedRange : aSupportedRanges)
+ *(pCP++) = supportedRange;
+ }
+
+ // prepare the glyphid-array if needed
+ // TODO: merge ranges if they are close enough?
+ sal_uInt16* pGlyphIds = nullptr;
+ if( !aGlyphIdArray.empty())
+ {
+ pGlyphIds = new sal_uInt16[ aGlyphIdArray.size() ];
+ sal_uInt16* pOut = pGlyphIds;
+ for (auto const& glyphId : aGlyphIdArray)
+ *(pOut++) = glyphId;
+ }
+
+ // update the result struct
+ rResult.mpRangeCodes = pCodePairs;
+ rResult.mpStartGlyphs = pStartGlyphs;
+ rResult.mnRangeCount = nRangeCount;
+ rResult.mpGlyphIds = pGlyphIds;
+ return true;
+}
+
+FontCharMap::FontCharMap()
+ : mpImplFontCharMap( ImplFontCharMap::getDefaultMap() )
+{
+}
+
+FontCharMap::FontCharMap( ImplFontCharMapRef const & pIFCMap )
+ : mpImplFontCharMap( pIFCMap )
+{
+}
+
+FontCharMap::FontCharMap( const CmapResult& rCR )
+ : mpImplFontCharMap(new ImplFontCharMap(rCR))
+{
+}
+
+FontCharMap::~FontCharMap()
+{
+ mpImplFontCharMap = nullptr;
+}
+
+FontCharMapRef FontCharMap::GetDefaultMap( bool bSymbol )
+{
+ FontCharMapRef xFontCharMap( new FontCharMap( ImplFontCharMap::getDefaultMap( bSymbol ) ) );
+ return xFontCharMap;
+}
+
+bool FontCharMap::IsDefaultMap() const
+{
+ return mpImplFontCharMap->isDefaultMap();
+}
+
+bool FontCharMap::isSymbolic() const { return mpImplFontCharMap->m_bSymbolic; }
+
+int FontCharMap::GetCharCount() const
+{
+ return mpImplFontCharMap->mnCharCount;
+}
+
+int FontCharMap::CountCharsInRange( sal_UCS4 cMin, sal_UCS4 cMax ) const
+{
+ int nCount = 0;
+
+ // find and adjust range and char count for cMin
+ int nRangeMin = findRangeIndex( cMin );
+ if( nRangeMin & 1 )
+ ++nRangeMin;
+ else if( cMin > mpImplFontCharMap->mpRangeCodes[ nRangeMin ] )
+ nCount -= cMin - mpImplFontCharMap->mpRangeCodes[ nRangeMin ];
+
+ // find and adjust range and char count for cMax
+ int nRangeMax = findRangeIndex( cMax );
+ if( nRangeMax & 1 )
+ --nRangeMax;
+ else
+ nCount -= mpImplFontCharMap->mpRangeCodes[ nRangeMax+1 ] - cMax - 1;
+
+ // count chars in complete ranges between cMin and cMax
+ for( int i = nRangeMin; i <= nRangeMax; i+=2 )
+ nCount += mpImplFontCharMap->mpRangeCodes[i+1] - mpImplFontCharMap->mpRangeCodes[i];
+
+ return nCount;
+}
+
+bool FontCharMap::HasChar( sal_UCS4 cChar ) const
+{
+ bool bHasChar = false;
+
+ if( mpImplFontCharMap->mpStartGlyphs == nullptr ) { // only the char-ranges are known
+ const int nRange = findRangeIndex( cChar );
+ if( nRange==0 && cChar < mpImplFontCharMap->mpRangeCodes[0] )
+ return false;
+ bHasChar = ((nRange & 1) == 0); // inside a range
+ } else { // glyph mapping is available
+ const int nGlyphIndex = GetGlyphIndex( cChar );
+ bHasChar = (nGlyphIndex != 0); // not the notdef-glyph
+ }
+
+ return bHasChar;
+}
+
+sal_UCS4 FontCharMap::GetFirstChar() const
+{
+ return mpImplFontCharMap->mpRangeCodes[0];
+}
+
+sal_UCS4 FontCharMap::GetLastChar() const
+{
+ return (mpImplFontCharMap->mpRangeCodes[ 2*mpImplFontCharMap->mnRangeCount-1 ] - 1);
+}
+
+sal_UCS4 FontCharMap::GetNextChar( sal_UCS4 cChar ) const
+{
+ if( cChar < GetFirstChar() )
+ return GetFirstChar();
+ if( cChar >= GetLastChar() )
+ return GetLastChar();
+
+ int nRange = findRangeIndex( cChar + 1 );
+ if( nRange & 1 ) // outside of range?
+ return mpImplFontCharMap->mpRangeCodes[ nRange + 1 ]; // => first in next range
+ return (cChar + 1);
+}
+
+sal_UCS4 FontCharMap::GetPrevChar( sal_UCS4 cChar ) const
+{
+ if( cChar <= GetFirstChar() )
+ return GetFirstChar();
+ if( cChar > GetLastChar() )
+ return GetLastChar();
+
+ int nRange = findRangeIndex( cChar - 1 );
+ if( nRange & 1 ) // outside a range?
+ return (mpImplFontCharMap->mpRangeCodes[ nRange ] - 1); // => last in prev range
+ return (cChar - 1);
+}
+
+int FontCharMap::GetIndexFromChar( sal_UCS4 cChar ) const
+{
+ // TODO: improve linear walk?
+ int nCharIndex = 0;
+ const sal_UCS4* pRange = &mpImplFontCharMap->mpRangeCodes[0];
+ for( int i = 0; i < mpImplFontCharMap->mnRangeCount; ++i )
+ {
+ sal_UCS4 cFirst = *(pRange++);
+ sal_UCS4 cLast = *(pRange++);
+ if( cChar >= cLast )
+ nCharIndex += cLast - cFirst;
+ else if( cChar >= cFirst )
+ return nCharIndex + (cChar - cFirst);
+ else
+ break;
+ }
+
+ return -1;
+}
+
+sal_UCS4 FontCharMap::GetCharFromIndex( int nIndex ) const
+{
+ // TODO: improve linear walk?
+ const sal_UCS4* pRange = &mpImplFontCharMap->mpRangeCodes[0];
+ for( int i = 0; i < mpImplFontCharMap->mnRangeCount; ++i )
+ {
+ sal_UCS4 cFirst = *(pRange++);
+ sal_UCS4 cLast = *(pRange++);
+ nIndex -= cLast - cFirst;
+ if( nIndex < 0 )
+ return (cLast + nIndex);
+ }
+
+ // we can only get here with an out-of-bounds charindex
+ return mpImplFontCharMap->mpRangeCodes[0];
+}
+
+int FontCharMap::findRangeIndex( sal_UCS4 cChar ) const
+{
+ int nLower = 0;
+ int nMid = mpImplFontCharMap->mnRangeCount;
+ int nUpper = 2 * mpImplFontCharMap->mnRangeCount - 1;
+ while( nLower < nUpper )
+ {
+ if( cChar >= mpImplFontCharMap->mpRangeCodes[ nMid ] )
+ nLower = nMid;
+ else
+ nUpper = nMid - 1;
+ nMid = (nLower + nUpper + 1) / 2;
+ }
+
+ return nMid;
+}
+
+int FontCharMap::GetGlyphIndex( sal_UCS4 cChar ) const
+{
+ // return -1 if the object doesn't know the glyph ids
+ if( !mpImplFontCharMap->mpStartGlyphs )
+ return -1;
+
+ // return 0 if the unicode doesn't have a matching glyph
+ int nRange = findRangeIndex( cChar );
+ // check that we are inside any range
+ if( (nRange == 0) && (cChar < mpImplFontCharMap->mpRangeCodes[0]) ) {
+ // symbol aliasing gives symbol fonts a second chance
+ const bool bSymbolic = cChar <= 0xFF && (mpImplFontCharMap->mpRangeCodes[0]>=0xF000) &&
+ (mpImplFontCharMap->mpRangeCodes[1]<=0xF0FF);
+ if( !bSymbolic )
+ return 0;
+ // check for symbol aliasing (U+F0xx -> U+00xx)
+ cChar |= 0xF000;
+ nRange = findRangeIndex( cChar );
+ if( (nRange == 0) && (cChar < mpImplFontCharMap->mpRangeCodes[0]) ) {
+ return 0;
+ }
+ }
+ // check that we are inside a range
+ if( (nRange & 1) != 0 )
+ return 0;
+
+ // get glyph index directly or indirectly
+ int nGlyphIndex = cChar - mpImplFontCharMap->mpRangeCodes[ nRange ];
+ const int nStartIndex = mpImplFontCharMap->mpStartGlyphs[ nRange/2 ];
+ if( nStartIndex >= 0 ) {
+ // the glyph index can be calculated
+ nGlyphIndex += nStartIndex;
+ } else {
+ // the glyphid array has the glyph index
+ nGlyphIndex = mpImplFontCharMap->mpGlyphIds[ nGlyphIndex - nStartIndex];
+ }
+
+ return nGlyphIndex;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */