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/*************************************************************************
** Font.h **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2013 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 FONT_H
#define FONT_H
#include <map>
#include <string>
#include <vector>
#include "FontCache.h"
#include "FontEncoding.h"
#include "GFGlyphTracer.h"
#include "Glyph.h"
#include "GraphicPath.h"
#include "MessageException.h"
#include "VFActions.h"
#include "VFReader.h"
#include "types.h"
struct FontMetric;
/** Abstract base for all font classes. */
struct Font {
struct Style {
Style () : bold(0), extend(0), slant(0) {}
Style (float b, float e, float s) : bold(b), extend(e), slant(s) {}
double bold; ///< stroke width in pt used to draw the glyph outlines
double extend; ///< factor to strech/shrink the glyphs horizontally
double slant; ///< horizontal slanting/skewing value (= tan(phi))
};
virtual ~Font () {}
virtual Font* clone (double ds, double sc) const =0;
virtual const Font* uniqueFont () const =0;
virtual std::string name () const =0;
virtual double designSize () const =0;
virtual double scaledSize () const =0;
virtual double scaleFactor () const {return scaledSize()/designSize();}
virtual double charWidth (int c) const =0;
virtual double charDepth (int c) const =0;
virtual double charHeight (int c) const =0;
virtual double italicCorr (int c) const =0;
virtual const FontMetric* getMetrics () const =0;
virtual const char* path () const =0;
virtual FontEncoding* encoding () const {return FontEncoding::encoding(name());}
virtual bool getGlyph (int c, Glyph &glyph, GFGlyphTracer::Callback *cb=0) const =0;
virtual UInt32 unicode (UInt32 c) const;
virtual void tidy () const {}
virtual bool verifyChecksums () const {return true;}
virtual int fontIndex () const {return 0;}
virtual const Style* style () const {return 0;}
};
/** Empty font without any glyphs. Instances of this class are used
* if no physical or virtual font file can be found.
* The metric values returned by the member functions are based on cmr10. */
struct EmptyFont : public Font
{
public:
EmptyFont (std::string name) : _fontname(name) {}
Font* clone (double ds, double sc) const {return new EmptyFont(*this);}
const Font* uniqueFont () const {return this;}
std::string name () const {return _fontname;}
double designSize () const {return 10;} // cmr10 design size in pt
double scaledSize () const {return 10;} // cmr10 scaled size in pt
double charWidth (int c) const {return 9.164;} // width of cmr10's 'M' in pt
double charHeight (int c) const {return 6.833;} // height of cmr10's 'M' in pt
double charDepth (int c) const {return 0;}
double italicCorr (int c) const {return 0;}
const FontMetric* getMetrics () const {return 0;}
const char* path () const {return 0;}
bool getGlyph (int c, Glyph &glyph, GFGlyphTracer::Callback *cb=0) const {return false;}
private:
std::string _fontname;
};
/** Interface for all physical fonts. */
class PhysicalFont : public virtual Font
{
public:
enum Type {MF, PFB, TTC, TTF};
static Font* create (std::string name, UInt32 checksum, double dsize, double ssize, PhysicalFont::Type type);
static Font* create (std::string name, int fontindex, UInt32 checksum, double dsize, double ssize);
virtual Type type () const =0;
virtual bool getGlyph (int c, Glyph &glyph, GFGlyphTracer::Callback *cb=0) const;
virtual bool getGlyphBox (int c, BoundingBox &bbox, GFGlyphTracer::Callback *cb=0) const;
virtual int hAdvance () const;
virtual double hAdvance (int c) const;
std::string glyphName (int c) const;
virtual int unitsPerEm () const;
virtual int ascent () const;
virtual int descent () const;
virtual int traceAllGlyphs (bool includeCached, GFGlyphTracer::Callback *cb=0) const;
const char* path () const;
virtual void setStyle (double bold, double extend, double slant) {}
protected:
bool createGF (std::string &gfname) const;
public:
static bool KEEP_TEMP_FILES;
static const char *CACHE_PATH; ///< path to cache directory (0 if caching is disabled)
static double METAFONT_MAG; ///< magnification factor for Metafont calls
protected:
static FontCache _cache;
};
/** Interface for all virtual fonts. */
class VirtualFont : public virtual Font
{
friend class FontManager;
public:
typedef std::vector<UInt8> DVIVector;
public:
static Font* create (std::string name, UInt32 checksum, double dsize, double ssize);
virtual const DVIVector* getDVI (int c) const =0;
bool getGlyph (int c, Glyph &glyph, GFGlyphTracer::Callback *cb=0) const {return false;}
protected:
virtual void assignChar (UInt32 c, DVIVector *dvi) =0;
};
class TFMFont : public virtual Font
{
public:
TFMFont (std::string name, UInt32 checksum, double dsize, double ssize);
~TFMFont ();
const FontMetric* getMetrics () const;
std::string name () const {return _fontname;}
double designSize () const {return _dsize;}
double scaledSize () const {return _ssize;}
double charWidth (int c) const;
double charDepth (int c) const;
double charHeight (int c) const;
double italicCorr (int c) const;
bool verifyChecksums () const;
private:
mutable FontMetric *_metrics;
std::string _fontname;
UInt32 _checksum; ///< cheksum to be compared with TFM checksum
double _dsize; ///< design size in TeX point units
double _ssize; ///< scaled size
};
class PhysicalFontProxy : public PhysicalFont
{
friend class PhysicalFontImpl;
public:
Font* clone (double ds, double sc) const {return new PhysicalFontProxy(*this, ds, sc);}
const Font* uniqueFont () const {return _pf;}
std::string name () const {return _pf->name();}
double designSize () const {return _dsize;}
double scaledSize () const {return _ssize;}
double charWidth (int c) const {return _pf->charWidth(c);}
double charDepth (int c) const {return _pf->charDepth(c);}
double charHeight (int c) const {return _pf->charHeight(c);}
double italicCorr (int c) const {return _pf->italicCorr(c);}
const FontMetric* getMetrics () const {return _pf->getMetrics();}
Type type () const {return _pf->type();}
UInt32 unicode (UInt32 c) const {return _pf->unicode(c);}
int fontIndex () const {return _pf->fontIndex();}
const Style* style () const {return _pf->style();}
protected:
PhysicalFontProxy (const PhysicalFont *font, double ds, double ss) : _pf(font), _dsize(ds), _ssize(ss) {}
PhysicalFontProxy (const PhysicalFontProxy &proxy, double ds, double ss) : _pf(proxy._pf), _dsize(ds), _ssize(ss) {}
private:
const PhysicalFont *_pf;
double _dsize; ///< design size in TeX point units
double _ssize; ///< scaled size
};
class PhysicalFontImpl : public PhysicalFont, public TFMFont
{
friend class PhysicalFont;
public:
~PhysicalFontImpl();
Font* clone (double ds, double ss) const {return new PhysicalFontProxy(this, ds, ss);}
const Font* uniqueFont () const {return this;}
Type type () const {return _filetype;}
int fontIndex() const {return _fontIndex;}
const Style* style () const {return _style;}
void setStyle (double bold, double extend, double slant);
UInt32 unicode (UInt32 c) const;
void tidy () const;
protected:
PhysicalFontImpl (std::string name, int fontindex, UInt32 checksum, double dsize, double ssize, PhysicalFont::Type type);
private:
Type _filetype;
int _fontIndex;
Style *_style;
mutable std::map<UInt32,UInt32> *_charmap;
};
class VirtualFontProxy : public VirtualFont
{
friend class VirtualFontImpl;
public:
Font* clone (double ds, double ss) const {return new VirtualFontProxy(*this, ds, ss);}
const Font* uniqueFont () const {return _vf;}
std::string name () const {return _vf->name();}
const DVIVector* getDVI (int c) const {return _vf->getDVI(c);}
double designSize () const {return _dsize;}
double scaledSize () const {return _ssize;}
double charWidth (int c) const {return _vf->charWidth(c);}
double charDepth (int c) const {return _vf->charDepth(c);}
double charHeight (int c) const {return _vf->charHeight(c);}
double italicCorr (int c) const {return _vf->italicCorr(c);}
const FontMetric* getMetrics () const {return _vf->getMetrics();}
const char* path () const {return _vf->path();}
protected:
VirtualFontProxy (const VirtualFont *font, double ds, double ss) : _vf(font), _dsize(ds), _ssize(ss) {}
VirtualFontProxy (const VirtualFontProxy &proxy, double ds, double ss) : _vf(proxy._vf), _dsize(ds), _ssize(ss) {}
void assignChar (UInt32 c, DVIVector *dvi) {delete dvi;}
private:
const VirtualFont *_vf;
double _dsize; ///< design size in TeX point units
double _ssize; ///< scaled size in TeX point units
};
class VirtualFontImpl : public VirtualFont, public TFMFont
{
friend class VirtualFont;
public:
~VirtualFontImpl ();
Font* clone (double ds, double ss) const {return new VirtualFontProxy(this, ds, ss);}
const Font* uniqueFont () const {return this;}
const DVIVector* getDVI (int c) const;
const char* path () const;
protected:
VirtualFontImpl (std::string name, UInt32 checksum, double dsize, double ssize);
void assignChar (UInt32 c, DVIVector *dvi);
private:
std::map<UInt32, DVIVector*> _charDefs; ///< dvi subroutines defining the characters
};
struct FontException : public MessageException
{
FontException (std::string msg) : MessageException(msg) {}
};
#endif
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