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/*************************************************************************
** HheaTable.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 "HheaTable.hpp"
#include "TTFWriter.hpp"
#include "../Font.hpp"
using namespace std;
using namespace ttf;
void HheaTable::write (ostream &os) const {
const PhysicalFont &font = ttfWriter()->getFont();
double scale = ttfWriter()->unitsPerEmFactor();
writeUInt16(os, 1); // major version
writeUInt16(os, 0); // minor version
writeInt16(os, round(font.ascent()*scale));
writeInt16(os, round(-font.descent()*scale));
writeInt16(os, 0); // line gap
writeUInt16(os, _advanceWidthMax);
writeInt16(os, _minLeftSideBearing);
writeInt16(os, _minRightSideBearing);
writeInt16(os, _xMaxExtent);
writeInt16(os, 1); // caretSlopeRise (1 = vertical)
writeInt16(os, 0); // caretSlopeRun (0 = vertical)
writeInt16(os, 0); // caretOffset
writeInt16(os, 0); // reserved
writeInt16(os, 0); // reserved
writeInt16(os, 0); // reserved
writeInt16(os, 0); // reserved
writeInt16(os, 0); // metricDataFormat (always 0)
writeUInt16(os, _numberOfHMetrics);
}
void HheaTable::updateXMinMax (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 advance = (c == 0 ? xmax : round(scale*extend*font.hAdvance(c)));
_xMaxExtent = max(_xMaxExtent, xmax);
_minLeftSideBearing = min(_minLeftSideBearing, xmin);
_minRightSideBearing = min(_minRightSideBearing, int16_t(advance-xmax));
}
void HheaTable::updateAdvanceWidth (uint16_t w, uint16_t numberOfHMetrics) {
_advanceWidthMax = max(_advanceWidthMax, w);
_numberOfHMetrics = numberOfHMetrics;
}
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