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/*************************************************************************
** GFReader.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2022 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 GFREADER_HPP
#define GFREADER_HPP
#include <istream>
#include <string>
#include <unordered_map>
#include "Bitmap.hpp"
#include "MessageException.hpp"
class CharInfo;
struct GFException : public MessageException {
explicit GFException (const std::string &msg) : MessageException(msg) {}
};
class GFReader {
struct CharInfo {
CharInfo () : dx(0), dy(0), width(0), location(0) {}
CharInfo (int32_t dxx, int32_t dyy, int32_t w, uint32_t p) : dx(dxx), dy(dyy), width(w), location(p) {}
int32_t dx, dy;
int32_t width; // 2^24 * (true width)/(design size)
uint32_t location;
};
public:
explicit GFReader (std::istream &is) : _in(is) {}
virtual ~GFReader () =default;
virtual bool executeChar (uint8_t c);
virtual bool executeAllChars ();
bool executePreamble ();
bool executePostamble ();
virtual void preamble (const std::string &str) {}
virtual void postamble () {}
virtual void beginChar (uint32_t c) {}
virtual void endChar (uint32_t c) {}
virtual void special (const std::string &str) {}
virtual void numspecial (int32_t y) {}
const Bitmap& getBitmap () const {return _bitmap;}
double getDesignSize () const {return _designSize;}
double getHPixelsPerPoint () const {return _hppp;}
double getVPixelsPerPoint () const {return _vppp;};
double getCharWidth (uint32_t c) const;
uint32_t getChecksum () const {return _checksum;}
protected:
int32_t readSigned (int bytes);
uint32_t readUnsigned (int bytes);
std::string readString (int len);
int executeCommand ();
std::istream& getInputStream () const {return _in;}
void cmdPre (int);
void cmdPost (int);
void cmdPostPost (int);
void cmdPaint0 (int pixels);
void cmdPaint (int len);
void cmdBoc (int);
void cmdBoc1 (int);
void cmdEoc (int);
void cmdSkip (int len);
void cmdNewRow (int col);
void cmdXXX (int len);
void cmdYYY (int);
void cmdNop (int);
void cmdCharLoc0 (int);
void cmdCharLoc (int);
private:
std::istream &_in;
int32_t _minX=0, _maxX=0, _minY=0, _maxY=0;
int32_t _x=0, _y=0; ///< current pen location (pixel units)
int32_t _currentChar=0;
Bitmap _bitmap; ///< bitmap of current char
double _designSize=0; ///< designSize in PS points
double _hppp=0, _vppp=0; ///< horizontal and vertical pixel per point
uint32_t _checksum=0;
std::unordered_map<uint8_t,CharInfo> _charInfoMap;
bool _insideCharDef=false; ///< true if inside a character definition (between BOC and EOC)
bool _penDown=false;
};
#endif
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