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/*************************************************************************
** CmapTable.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2024 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program is 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. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <algorithm>
#include "CmapTable.hpp"
#include "TTFWriter.hpp"
#include "../Font.hpp"
#include "../utility.hpp"
using namespace std;
using namespace ttf;
void CmapTable::write (ostream &os) const {
writeUInt16(os, 0); // version
writeUInt16(os, 2); // number of encoding tables
const RangeMap &charmap = ttfWriter()->getUnicodeCharMap();
bool isUCS2 = (charmap.maxKey() <= 0xFFFF);
uint32_t offset = 4+2*8; // offset to subtable
writeUInt16(os, 0); // platform ID 0 = Unicode
writeUInt16(os, isUCS2 ? 3 : 4); // encoding ID (Unicode 2.0, UCS-2 or UCS-4)
writeUInt32(os, offset);
writeUInt16(os, 3); // platform ID 3 = Windows
writeUInt16(os, isUCS2 ? 1 : 10); // encoding ID (UCS-2 or UCS-4)
writeUInt32(os, offset); // platform ID 0 = Unicode
if (isUCS2)
writeSubTableFormat4(os, charmap);
else
writeSubTableFormat12(os, charmap);
}
/** Writes mapping data in subtable format 0 (byte encoding table). */
void CmapTable::writeSubTableFormat0 (ostream &os, const RangeMap &charmap) const {
writeUInt16(os, 0); // subtable format
writeUInt16(os, 3*2+256); // table length
writeUInt16(os, 0); // language: none
vector<uint8_t> indexes(256, 0);
int count=1;
for (auto cppair : charmap) {
if (cppair.first > 255 || count > 255)
break;
indexes[cppair.first] = uint8_t(count++);
}
for (uint8_t c : indexes)
writeUInt8(os, c);
}
/** Writes mapping data in subtable format 4 (segment mapping to delta values, UCS-2). */
void CmapTable::writeSubTableFormat4 (ostream &os, const RangeMap &charmap) const {
uint16_t numSegments = charmap.numRanges()+1;
uint16_t searchRange = 1 << (util::ilog2(numSegments)+1);
uint16_t entrySelector = util::ilog2(searchRange/2);
uint16_t rangeShift = 2*numSegments - searchRange;
writeUInt16(os, 4); // subtable format
writeUInt16(os, 8*2+4*2*numSegments); // table length
writeUInt16(os, 0); // language: none
writeUInt16(os, numSegments*2);
writeUInt16(os, searchRange);
writeUInt16(os, entrySelector);
writeUInt16(os, rangeShift);
for (size_t i=0; i < charmap.numRanges(); i++)
writeUInt16(os, charmap.getRange(i).max()); // end character code of current segment
writeUInt16(os, 0xFFFF); // final end character code
writeUInt16(os, 0); // reserved pad
for (size_t i=0; i < charmap.numRanges(); i++)
writeUInt16(os, charmap.getRange(i).min()); // start character code of current segment
writeUInt16(os, 0xFFFF); // final start character code
int count=1;
for (size_t i=0; i < charmap.numRanges(); i++) {
const auto &range = charmap.getRange(i);
int cstart = range.min();
writeInt16(os, count-cstart); // idDelta of current segment
count += range.numKeys();
}
writeUInt16(os, 1); // final idRange (maps 0xFFFF to 0)
for (uint16_t i=0; i < numSegments; i++)
writeUInt16(os, 0); // idRangeOffsets = 0 (no offsets into glyphIdArray required)
}
/** Writes mapping data in subtable format 6 (trimmed table mapping, UCS-2). */
void CmapTable::writeSubTableFormat6 (ostream &os, const RangeMap &charmap) const {
writeUInt16(os, 6); // subtable format
writeUInt16(os, 5*2+2*charmap.numValues()); // table length
writeUInt16(os, 0); // language: none
writeUInt16(os, charmap.getRange(0).min()); // first character code
writeUInt16(os, charmap.getRange(0).numKeys());
for (size_t i=0; i < charmap.getRange(0).numKeys(); i++)
writeUInt16(os, i+1);
}
/** Writes mapping data in subtable format 12 (segmented coverage, UCS-4). */
void CmapTable::writeSubTableFormat12 (ostream &os, const RangeMap &charmap) const {
writeUInt16(os, 12); // subtable format
writeUInt16(os, 0); // reserved
writeUInt32(os, 2*2+3*4+charmap.numRanges()*3*4); // table length
writeUInt32(os, 0); // language
writeUInt32(os, charmap.numRanges());
uint32_t startIndex=1;
for (size_t i=0; i < charmap.numRanges(); i++) {
const auto &range = charmap.getRange(i);
writeUInt32(os, range.min()); // startCharCode
writeUInt32(os, range.max()); // endCharCode
writeUInt32(os, startIndex); // startGlyphID
startIndex += range.numKeys();
}
}
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