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/*************************************************************************
** HmtxTable.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2023 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 <cmath>
#include "HmtxTable.hpp"
#include "TTFWriter.hpp"
#include "../Font.hpp"
using namespace std;
using namespace ttf;
void HmtxTable::write (ostream &os) const {
auto runStart = _widthInfos.end();
if (!_widthInfos.empty())
runStart -= _runLengthOfAdvWidth-1;
// write longHorMetrics up to the beginning of the repeating
// advance widths at the end of the container
for (auto it = _widthInfos.begin(); it != runStart; ++it) {
writeUInt16(os, it->advWidth);
writeInt16(os, it->lsb);
}
// write the trailing left side bearings
for (; runStart != _widthInfos.end(); ++runStart)
writeInt16(os, runStart->lsb);
}
void HmtxTable::updateWidthData (uint32_t c, int16_t xmin, int16_t xmax) {
const PhysicalFont &font = ttfWriter()->getFont();
double extend = font.style() ? font.style()->extend : 1;
double scale = ttfWriter()->unitsPerEmFactor();
int16_t w = (c == 0 ? xmax : int16_t(round(scale*extend*font.hAdvance(c))));
if (_isFixedPitch && c > 0 && w != _width) {
if (_width == 0)
_width = w;
else
_isFixedPitch = false;
}
if (_widthInfos.empty() || w == _widthInfos.back().advWidth)
_runLengthOfAdvWidth++;
else
_runLengthOfAdvWidth = 1;
_widthInfos.emplace_back(CharWidthInfo(xmin, w));
ttfWriter()->updateGlobalAdvanceWidth(w, _widthInfos.size()-_runLengthOfAdvWidth+1);
}
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