diff options
Diffstat (limited to 'dviware/dvisvgm/src/ttf/VheaTable.cpp')
-rw-r--r-- | dviware/dvisvgm/src/ttf/VheaTable.cpp | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/ttf/VheaTable.cpp b/dviware/dvisvgm/src/ttf/VheaTable.cpp new file mode 100644 index 0000000000..d49b76f523 --- /dev/null +++ b/dviware/dvisvgm/src/ttf/VheaTable.cpp @@ -0,0 +1,66 @@ +/************************************************************************* +** VheaTable.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 "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; +} |