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/*************************************************************************
** TFM.hpp **
** **
** 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/>. **
*************************************************************************/
#ifndef TFM_HPP
#define TFM_HPP
#include <istream>
#include <string>
#include <vector>
#include "FixWord.hpp"
#include "FontMetrics.hpp"
#include "StreamReader.hpp"
class StreamReader;
class TFM : public FontMetrics
{
public:
TFM (std::istream &is);
double getCharWidth (int c) const override;
double getCharHeight (int c) const override;
double getCharDepth (int c) const override;
double getItalicCorr (int c) const override;
double getDesignSize () const override {return _designSize;}
double getSpace () const override;
double getSpaceStretch () const override;
double getSpaceShrink () const override;
double getQuad () const override;
double getAscent () const override {return double(_ascent)*_designSize;}
double getDescent () const override {return double(_descent)*_designSize;}
bool verticalLayout () const override {return false;}
uint32_t getChecksum () const override {return _checksum;}
uint16_t firstChar () const override {return _firstChar;}
uint16_t lastChar () const override {return _lastChar;}
protected:
TFM () : _checksum(0), _firstChar(0), _lastChar(0), _designSize(0), _params(7) {}
void readHeader (StreamReader &reader);
void readTables (StreamReader &reader, int nw, int nh, int nd, int ni);
void readParameters (StreamReader &reader, int np);
virtual int charIndex (int c) const;
void setCharRange (int firstchar, int lastchar) {_firstChar=firstchar; _lastChar=lastchar;}
private:
uint32_t _checksum;
uint16_t _firstChar, _lastChar;
double _designSize; ///< design size of the font in PS points (72bp = 1in)
std::vector<uint32_t> _charInfoTable;
std::vector<FixWord> _widthTable; ///< character widths in design size units
std::vector<FixWord> _heightTable; ///< character height in design size units
std::vector<FixWord> _depthTable; ///< character depth in design size units
std::vector<FixWord> _italicTable; ///< italic corrections in design size units
std::vector<FixWord> _params; ///< values of the TFM's param section
FixWord _ascent, _descent; ///< max. height and depth
};
#endif
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