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/*************************************************************************
** MetafontWrapper.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2018 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 <cstdlib>
#include <cctype>
#include <fstream>
#include <sstream>
#include "FileSystem.hpp"
#include "FileFinder.hpp"
#include "Message.hpp"
#include "MetafontWrapper.hpp"
#include "Process.hpp"
#include "XMLString.hpp"
using namespace std;
MetafontWrapper::MetafontWrapper (const string &fname, const string &dir) : _fontname(fname), _dir(dir)
{
// ensure that folder paths ends with slash
if (_dir.empty())
_dir = "./";
else if (_dir != "/" && dir[dir.length()-1] != '/')
_dir += '/';
}
/** Calls Metafont and evaluates the logfile. If a gf file was successfully
* generated the dpi value is stripped from the filename
* (e.g. cmr10.600gf => cmr10.gf). This makes life easier...
* @param[in] mode Metafont mode, e.g. "ljfour"
* @param[in] mag magnification factor
* @return true on success */
bool MetafontWrapper::call (const string &mode, double mag) {
if (!FileFinder::instance().lookup(_fontname+".mf"))
return false; // mf file not available => no need to call the "slow" Metafont
FileSystem::remove(_fontname+".gf");
#ifdef _WIN32
#ifdef TEXLIVEWIN32
const char *mfname = "mf-nowin.exe";
#else
const char *mfname = "mf.exe";
#endif
const char *cmd = FileFinder::instance().lookup(mfname, false);
if (!cmd) {
Message::estream(true) << "can't run Metafont (" << mfname << " not found)\n";
return false;
}
#else
const char *cmd = "mf";
#endif
ostringstream oss;
oss << "\"\\mode=" << mode << ";" // set MF mode, e.g. 'proof', 'ljfour' or 'localfont'
"mode_setup;" // initialize MF variables
"mag:=" << mag << ";" // set magnification factor
"show pixels_per_inch*mag;" // print character resolution to stdout
"batchmode;" // don't halt on errors and don't print informational messages
"input " << _fontname << "\""; // load font description
Message::mstream(false, Message::MC_STATE) << "\nrunning Metafont for " << _fontname << '\n';
Process mf_process(cmd, oss.str());
string mf_messages;
mf_process.run(_dir, &mf_messages);
// get resolution value from stdout created by above MF command
char buf[256];
istringstream iss(mf_messages);
int resolution = 0;
while (iss) {
iss.getline(buf, sizeof(buf));
string line = buf;
if (line.substr(0, 3) == ">> ") {
resolution = atoi(line.substr(3).c_str());
break;
}
}
// compose expected name of GF file (see Metafont Book, p. 324)
string gfname = _dir + _fontname + ".";
if (resolution > 0)
gfname += XMLString(resolution);
gfname += "gf";
FileSystem::rename(gfname, _dir+_fontname+".gf"); // remove resolution value from filename
return FileSystem::exists(_dir+_fontname+".gf");
}
/** Calls Metafont if output files (tfm and gf) don't already exist.
* @param[in] mode Metafont mode to be used (e.g. 'ljfour')
* @param[in] mag magnification factor
* @return true on success */
bool MetafontWrapper::make (const string &mode, double mag) {
ifstream tfm((_dir+_fontname+".tfm").c_str());
ifstream gf((_dir+_fontname+".gf").c_str());
if (gf && tfm) // @@ distinguish between gf and tfm
return true;
return call(mode, mag);
}
bool MetafontWrapper::success () const {
ifstream tfm((_dir+_fontname+".tfm").c_str());
ifstream gf((_dir+_fontname+".gf").c_str());
return tfm && gf;
}
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