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/*
* 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 <utility>
#include <vcl/fontcharmap.hxx>
#include <impfontcharmap.hxx>
#include <sal/log.hxx>
#include <algorithm>
#include <vector>
static ImplFontCharMapRef g_pDefaultImplFontCharMap;
const std::vector<sal_uInt32> aDefaultUnicodeRanges = { 0x0020, 0xD800, 0xE000, 0xFFF0 };
const std::vector<sal_uInt32> aDefaultSymbolRanges = { 0x0020, 0x0100, 0xF020, 0xF100 };
ImplFontCharMap::~ImplFontCharMap()
{
}
ImplFontCharMap::ImplFontCharMap(bool bMicrosoftSymbolMap, std::vector<sal_uInt32> aRangeCodes)
: maRangeCodes(std::move(aRangeCodes))
, mnCharCount( 0 )
, m_bMicrosoftSymbolMap(bMicrosoftSymbolMap)
{
for (size_t i = 0; i < maRangeCodes.size(); i += 2)
{
sal_UCS4 cFirst = maRangeCodes[i];
sal_UCS4 cLast = maRangeCodes[i + 1];
mnCharCount += cLast - cFirst;
}
}
ImplFontCharMapRef const & ImplFontCharMap::getDefaultMap(bool bMicrosoftSymbolMap)
{
const auto& rRanges = bMicrosoftSymbolMap ? aDefaultSymbolRanges : aDefaultUnicodeRanges;
g_pDefaultImplFontCharMap = ImplFontCharMapRef(new ImplFontCharMap(bMicrosoftSymbolMap, rRanges));
return g_pDefaultImplFontCharMap;
}
bool ImplFontCharMap::isDefaultMap() const
{
const bool bIsDefault = (maRangeCodes == aDefaultUnicodeRanges) || (maRangeCodes == aDefaultSymbolRanges);
return bIsDefault;
}
static unsigned GetUShort(const unsigned char* p) { return((p[0]<<8) | p[1]);}
bool HasMicrosoftSymbolCmap(const unsigned char* pCmap, int nLength)
{
// 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;
for (const unsigned char* p = pCmap + 4; --nSubTables >= 0; p += 8)
{
int nPlatform = GetUShort(p);
int nEncoding = GetUShort(p + 2);
// https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6cmap.html
// When the platformID is 3 (Windows), an encoding of 0 is Symbol
if (nPlatform == 3 && nEncoding == 0)
return true;
}
return false;
}
FontCharMap::FontCharMap()
: mpImplFontCharMap( ImplFontCharMap::getDefaultMap() )
{
}
FontCharMap::FontCharMap( ImplFontCharMapRef pIFCMap )
: mpImplFontCharMap(std::move( pIFCMap ))
{
}
FontCharMap::FontCharMap(bool bMicrosoftSymbolMap, std::vector<sal_uInt32> aRangeCodes)
: mpImplFontCharMap(new ImplFontCharMap(bMicrosoftSymbolMap, std::move(aRangeCodes)))
{
}
FontCharMap::~FontCharMap()
{
mpImplFontCharMap = nullptr;
}
FontCharMapRef FontCharMap::GetDefaultMap(bool bMicrosoftSymbolMap)
{
FontCharMapRef xFontCharMap( new FontCharMap( ImplFontCharMap::getDefaultMap(bMicrosoftSymbolMap) ) );
return xFontCharMap;
}
bool FontCharMap::IsDefaultMap() const
{
return mpImplFontCharMap->isDefaultMap();
}
bool FontCharMap::isMicrosoftSymbolMap() const { return mpImplFontCharMap->m_bMicrosoftSymbolMap; }
int FontCharMap::GetCharCount() const
{
return mpImplFontCharMap->mnCharCount;
}
int FontCharMap::CountCharsInRange( sal_UCS4 cMin, sal_UCS4 cMax ) const
{
const auto& rRanges = mpImplFontCharMap->maRangeCodes;
int nCount = 0;
// find and adjust range and char count for cMin
int nRangeMin = findRangeIndex( cMin );
if( nRangeMin & 1 )
++nRangeMin;
else if (cMin > rRanges[nRangeMin])
nCount -= cMin - rRanges[nRangeMin];
// find and adjust range and char count for cMax
int nRangeMax = findRangeIndex( cMax );
if( nRangeMax & 1 )
--nRangeMax;
else
nCount -= rRanges[nRangeMax + 1] - cMax - 1;
// count chars in complete ranges between cMin and cMax
for( int i = nRangeMin; i <= nRangeMax; i+=2 )
nCount += rRanges[i + 1] - rRanges[i];
return nCount;
}
bool FontCharMap::HasChar( sal_UCS4 cChar ) const
{
const int nRange = findRangeIndex( cChar );
if (nRange==0 && cChar < mpImplFontCharMap->maRangeCodes[0])
return false;
return ((nRange & 1) == 0); // inside a range
}
sal_UCS4 FontCharMap::GetFirstChar() const
{
return mpImplFontCharMap->maRangeCodes.front();
}
sal_UCS4 FontCharMap::GetLastChar() const
{
return mpImplFontCharMap->maRangeCodes.back() - 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->maRangeCodes[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->maRangeCodes[nRange] - 1; // => last in prev range
return (cChar - 1);
}
int FontCharMap::GetIndexFromChar( sal_UCS4 cChar ) const
{
// TODO: improve linear walk?
int nCharIndex = 0;
const auto& rRanges = mpImplFontCharMap->maRangeCodes;
for (size_t i = 0; i < rRanges.size(); i += 2)
{
sal_UCS4 cFirst = rRanges[i];
sal_UCS4 cLast = rRanges[i + 1];
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 auto& rRanges = mpImplFontCharMap->maRangeCodes;
for (size_t i = 0; i < rRanges.size(); i += 2)
{
sal_UCS4 cFirst = rRanges[i];
sal_UCS4 cLast = rRanges[i + 1];
nIndex -= cLast - cFirst;
if( nIndex < 0 )
return (cLast + nIndex);
}
// we can only get here with an out-of-bounds charindex
return mpImplFontCharMap->maRangeCodes.front();
}
int FontCharMap::findRangeIndex( sal_UCS4 cChar ) const
{
const auto& rRanges = mpImplFontCharMap->maRangeCodes;
int nLower = 0;
int nMid = rRanges.size() / 2;
int nUpper = rRanges.size() - 1;
while( nLower < nUpper )
{
if (cChar >= rRanges[nMid])
nLower = nMid;
else
nUpper = nMid - 1;
nMid = (nLower + nUpper + 1) / 2;
}
return nMid;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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