1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/*************************************************************************
** VheaTable.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 "VheaTable.hpp"
#include "TTFWriter.hpp"
#include "../Font.hpp"
using namespace std;
using namespace ttf;
void VheaTable::write (ostream &os) const {
const PhysicalFont &font = ttfWriter()->getFont();
double scale = ttfWriter()->unitsPerEmFactor();
writeUInt32(os, 0x10000); // table version 1.0
writeInt16(os, round(font.ascent()*scale));
writeInt16(os, round(-font.descent()*scale));
writeInt16(os, 0); // line gap, always 0
writeUInt16(os, _advanceHeightMax);
writeInt16(os, _minTopSideBearing);
writeInt16(os, _minBottomSideBearing);
writeInt16(os, _yMaxExtent);
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, _numberOfVMetrics);
}
void VheaTable::updateYMinMax (uint32_t c, int16_t ymin, int16_t ymax) {
const PhysicalFont &font = ttfWriter()->getFont();
double extend = font.style() ? font.style()->extend : 1;
double scale = ttfWriter()->unitsPerEmFactor();
int16_t advance = (c == 0 ? ymax : round(scale*extend*font.vAdvance(c)));
_yMaxExtent = max(_yMaxExtent, ymax);
_minTopSideBearing = min(_minTopSideBearing, ymin);
_minBottomSideBearing = min(_minBottomSideBearing, int16_t(advance-ymax));
}
void VheaTable::updateAdvanceHeight (uint16_t h, uint16_t numberOfVMetrics) {
_advanceHeightMax = max(_advanceHeightMax, h);
_numberOfVMetrics = numberOfVMetrics;
}
|
