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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-src/src/ttf/HeadTable.cpp')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-src/src/ttf/HeadTable.cpp | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-src/src/ttf/HeadTable.cpp b/Build/source/texk/dvisvgm/dvisvgm-src/src/ttf/HeadTable.cpp new file mode 100644 index 00000000000..fff759898a6 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-src/src/ttf/HeadTable.cpp @@ -0,0 +1,78 @@ +/************************************************************************* +** HeadTable.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 <chrono> +#include <ctime> +#include <utility> +#include "HeadTable.hpp" +#include "TTFWriter.hpp" + +using namespace std; +using namespace ttf; + + +void HeadTable::updateGlobalBbox (int16_t xmin, int16_t ymin, int16_t xmax, int16_t ymax) { + if (xmin < _xMin) _xMin = xmin; + if (ymin < _yMin) _yMin = ymin; + if (xmax > _xMax) _xMax = xmax; + if (ymax > _yMax) _yMax = ymax; +} + + +/** Returns the number of seconds elapsed since 1.1.1904 00:00:00 until now. + * @return number of seconds separated in upper and lower dword of a 64-bit value */ +static pair<uint32_t,uint32_t> seconds_since_1904 () { + auto now = chrono::system_clock::now(); + time_t now_time = chrono::system_clock::to_time_t(now); + struct tm *comp = gmtime(&now_time); + util::Date date1(1904, 1, 1); + util::Date date2(comp->tm_year+1900, comp->tm_mon+1, comp->tm_mday); + uint64_t days = date2 - date1 - 1; + uint64_t seconds = ((days*24 + comp->tm_hour)*60 + comp->tm_min)*60 + comp->tm_sec; + return {uint32_t(seconds >> 32), uint32_t(seconds & 0xffffffff)}; +} + + +/** Writes the head table to a given output stream. + * https://docs.microsoft.com/en-us/typography/opentype/spec/head */ +void HeadTable::write (ostream &os) const { + writeUInt16(os, 1); // major version + writeUInt16(os, 0); // minor version + writeUInt32(os, 0x10000); // font revision (1.0) + writeUInt32(os, 0); // global checksum, computed and set by TTFWriter + writeUInt32(os, 0x5F0F3CF5); // magic number + writeUInt16(os, 1+2); // flags (baseline at y=0, left sidebearing point at x=0) + writeUInt16(os, uint16_t(std::round(ttfWriter()->targetUnitsPerEm()))); + auto seconds = seconds_since_1904(); + writeUInt32(os, seconds.first); // creation time, upper dword + writeUInt32(os, seconds.second); // creation time, lower dword + writeUInt32(os, seconds.first); // modification time, upper dword + writeUInt32(os, seconds.second); // modification time, lower dword + writeInt16(os, _xMin); + writeInt16(os, _yMin); + writeInt16(os, _xMax); + writeInt16(os, _yMax); + writeUInt16(os, 0); // macStyle + writeUInt16(os, 8); // smallest readable size in pixels + writeInt16(os, 2); // fontDirectionHint (deprecated, always 2) + writeInt16(os, _indexToLocFormat); + writeInt16(os, 0); // glyphDataFormat +} |