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/*************************************************************************
** Font.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2017 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_HPP
#define FONT_HPP
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "Character.hpp"
#include "CharMapID.hpp"
#include "Color.hpp"
#include "FontCache.hpp"
#include "FontEncoding.hpp"
#include "FontMap.hpp"
#include "FontMetrics.hpp"
#include "GFGlyphTracer.hpp"
#include "Glyph.hpp"
#include "GraphicsPath.hpp"
#include "MessageException.hpp"
#include "RangeMap.hpp"
#include "ToUnicodeMap.hpp"
#include "VFActions.hpp"
#include "VFReader.hpp"
struct FontStyle;
struct GlyphMetrics
{
GlyphMetrics () : wl(0), wr(0), h(0), d(0) {}
GlyphMetrics (double wwl, double wwr, double hh, double dd) : wl(wwl), wr(wwr), h(hh), d(dd) {}
double wl, wr, h, d;
};
/** Abstract base for all font classes. */
class Font {
public:
virtual ~Font () =default;
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 FontMetrics* getMetrics () const =0;
virtual const char* path () const =0;
virtual const char* filename () const;
virtual const FontEncoding* encoding () const;
virtual bool getGlyph (int c, Glyph &glyph, GFGlyphTracer::Callback *callback=0) const =0;
virtual void getGlyphMetrics (int c, bool vertical, GlyphMetrics &metrics) const;
virtual uint32_t unicode (uint32_t c) const;
virtual void tidy () const {}
virtual bool findAndAssignBaseFontMap () {return true;}
virtual bool verticalLayout () const {return getMetrics() ? getMetrics()->verticalLayout() : false;}
virtual bool verifyChecksums () const {return true;}
virtual int fontIndex () const {return 0;}
virtual const FontStyle* style () const {return 0;}
virtual Color color () const {return Color::BLACK;}
virtual const FontMap::Entry* fontMapEntry () const;
};
/** 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. */
class EmptyFont : public Font {
public:
EmptyFont (const std::string &name) : _fontname(name) {}
Font* clone (double ds, double sc) const override {return new EmptyFont(*this);}
const Font* uniqueFont () const override {return this;}
std::string name () const override {return _fontname;}
double designSize () const override {return 10;} // cmr10 design size in pt
double scaledSize () const override {return 10;} // cmr10 scaled size in pt
double charWidth (int c) const override {return 9.164;} // width of cmr10's 'M' in pt
double charHeight (int c) const override {return 6.833;} // height of cmr10's 'M' in pt
double charDepth (int c) const override {return 0;}
double italicCorr (int c) const override {return 0;}
const FontMetrics* getMetrics () const override {return 0;}
const char* path () const override {return 0;}
bool getGlyph (int c, Glyph &glyph, GFGlyphTracer::Callback *cb=0) const override {return false;}
private:
std::string _fontname;
};
/** Interface for all physical fonts. */
class PhysicalFont : public virtual Font {
public:
enum class Type {MF, OTF, PFB, TTC, TTF, UNKNOWN};
static Font* create (const std::string &name, uint32_t checksum, double dsize, double ssize, PhysicalFont::Type type);
static Font* create (const std::string &name, int fontindex, uint32_t checksum, double dsize, double ssize);
virtual Type type () const =0;
virtual bool getGlyph (int c, Glyph &glyph, GFGlyphTracer::Callback *cb=0) const override;
virtual bool getExactGlyphBox (int c, BoundingBox &bbox, GFGlyphTracer::Callback *cb=0) const;
virtual bool getExactGlyphBox (int c, GlyphMetrics &metrics, bool vertical, GFGlyphTracer::Callback *cb=0) const;
virtual bool isCIDFont () const;
virtual int hAdvance () const;
virtual std::string familyName () const;
virtual std::string styleName () const;
virtual double hAdvance (int c) const;
virtual double vAdvance (int c) const;
std::string glyphName (int c) const;
virtual int unitsPerEm () const;
virtual double scaledAscent () const;
virtual int ascent () const;
virtual int descent () const;
virtual int traceAllGlyphs (bool includeCached, GFGlyphTracer::Callback *cb=0) const;
virtual int collectCharMapIDs (std::vector<CharMapID> &charmapIDs) const;
virtual CharMapID getCharMapID () const =0;
virtual void setCharMapID (const CharMapID &id) {}
virtual Character decodeChar (uint32_t c) const;
const char* path () const override;
protected:
bool createGF (std::string &gfname) const;
public:
static bool EXACT_BBOX;
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_t> DVIVector;
public:
static Font* create (const std::string &name, uint32_t checksum, double dsize, double ssize);
virtual const DVIVector* getDVI (int c) const =0;
bool getGlyph (int c, Glyph &glyph, GFGlyphTracer::Callback *cb=0) const override {return false;}
protected:
virtual void assignChar (uint32_t c, DVIVector &&dvi) =0;
};
class TFMFont : public virtual Font {
public:
TFMFont (const std::string &name, uint32_t checksum, double dsize, double ssize);
const FontMetrics* getMetrics () const override;
std::string name () const override {return _fontname;}
double designSize () const override {return _dsize;}
double scaledSize () const override {return _ssize;}
double charWidth (int c) const override;
double charDepth (int c) const override;
double charHeight (int c) const override;
double italicCorr (int c) const override;
bool verifyChecksums () const override;
private:
mutable std::unique_ptr<FontMetrics> _metrics;
std::string _fontname;
uint32_t _checksum; ///< cheksum to be compared with TFM checksum
double _dsize; ///< design size in PS point units
double _ssize; ///< scaled size in PS point units
};
class PhysicalFontProxy : public PhysicalFont {
friend class PhysicalFontImpl;
public:
Font* clone (double ds, double sc) const override {return new PhysicalFontProxy(*this, ds, sc);}
const Font* uniqueFont () const override {return _pf;}
std::string name () const override {return _pf->name();}
double designSize () const override {return _dsize;}
double scaledSize () const override {return _ssize;}
double charWidth (int c) const override {return _pf->charWidth(c);}
double charDepth (int c) const override {return _pf->charDepth(c);}
double charHeight (int c) const override {return _pf->charHeight(c);}
double italicCorr (int c) const override {return _pf->italicCorr(c);}
const FontMetrics* getMetrics () const override {return _pf->getMetrics();}
Type type () const override {return _pf->type();}
uint32_t unicode (uint32_t c) const override {return _pf->unicode(c);}
int fontIndex () const override {return _pf->fontIndex();}
const FontStyle* style () const override {return _pf->style();}
const FontMap::Entry* fontMapEntry () const override {return _pf->fontMapEntry();}
const FontEncoding* encoding () const override {return _pf->encoding();}
CharMapID getCharMapID () const override {return _pf->getCharMapID();}
int collectCharMapIDs (std::vector<CharMapID> &charmapIDs) const override {return _pf->collectCharMapIDs(charmapIDs);}
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 PS point units
double _ssize; ///< scaled size in PS point units
};
class PhysicalFontImpl : public PhysicalFont, public TFMFont {
friend class PhysicalFont;
public:
~PhysicalFontImpl();
Font* clone (double ds, double ss) const override {return new PhysicalFontProxy(this, ds, ss);}
const Font* uniqueFont () const override {return this;}
Type type () const override {return _filetype;}
int fontIndex() const override {return _fontIndex;}
const FontStyle* style () const override {return _fontMapEntry ? &_fontMapEntry->style : 0;}
const FontMap::Entry* fontMapEntry () const override {return _fontMapEntry;}
const FontEncoding* encoding () const override;
uint32_t unicode (uint32_t c) const override;
bool findAndAssignBaseFontMap () override;
void tidy () const override;
CharMapID getCharMapID () const override {return _charmapID;}
protected:
PhysicalFontImpl (const std::string &name, int fontindex, uint32_t checksum, double dsize, double ssize, PhysicalFont::Type type);
private:
Type _filetype;
int _fontIndex;
const FontMap::Entry *_fontMapEntry;
FontEncodingPair _encodingPair;
CharMapID _charmapID; ///< ID of the font's charmap to use
const RangeMap *_localCharMap;
};
class NativeFont : public PhysicalFont {
public:
virtual NativeFont* clone (double ptsize, const FontStyle &style, Color color) const =0;
virtual Font* clone (double ds, double sc) const override =0;
std::string name () const override;
Type type () const override;
double designSize () const override {return _ptsize;}
double scaledSize () const override {return _ptsize;}
double charWidth (int c) const override;
double charDepth (int c) const override;
double charHeight (int c) const override;
double italicCorr (int c) const override {return 0;}
const FontMetrics* getMetrics () const override {return 0;}
const FontStyle* style () const override {return &_style;}
Color color () const override {return _color;}
const FontMap::Entry* fontMapEntry () const override {return 0;}
static std::string uniqueName (const std::string &path, const FontStyle &style);
protected:
NativeFont (double ptsize, const FontStyle &style, Color color) : _ptsize(ptsize), _style(style), _color(color) {}
private:
double _ptsize; ///< font size in PS point units
FontStyle _style;
Color _color;
};
class NativeFontProxy : public NativeFont {
friend class NativeFontImpl;
public:
NativeFont* clone (double ptsize, const FontStyle &style, Color color) const override {
return new NativeFontProxy(this, ptsize, style, color);
}
Font* clone (double ds, double sc) const override {return new NativeFontProxy(this , sc, *style(), color());}
const Font* uniqueFont () const override {return _nfont;}
const char* path () const override {return _nfont->path();}
int fontIndex () const override {return _nfont->fontIndex();}
Character decodeChar (uint32_t c) const override {return _nfont->decodeChar(c);}
uint32_t unicode (uint32_t c) const override {return _nfont->unicode(c);}
CharMapID getCharMapID () const override {return _nfont->getCharMapID();}
protected:
NativeFontProxy (const NativeFont *nfont, double ptsize, const FontStyle &style, Color color)
: NativeFont(ptsize, style, color), _nfont(nfont) {}
private:
const NativeFont *_nfont;
};
class NativeFontImpl : public NativeFont {
public:
NativeFontImpl (const std::string &fname, int fontIndex, double ptsize, const FontStyle &style, Color color)
: NativeFont(ptsize, style, color), _path(fname), _fontIndex(fontIndex) {}
NativeFont* clone (double ptsize, const FontStyle &style, Color color) const override {
return new NativeFontProxy(this, ptsize, style, color);
}
Font* clone (double ds, double sc) const override {return new NativeFontProxy(this , sc, *style(), color());}
const Font* uniqueFont () const override {return this;}
const char* path () const override {return _path.c_str();}
int fontIndex() const override {return _fontIndex;}
std::string fontFamily () const;
bool findAndAssignBaseFontMap () override;
CharMapID getCharMapID () const override {return CharMapID::NONE;}
Character decodeChar (uint32_t c) const override;
uint32_t unicode (uint32_t c) const override;
private:
std::string _path;
int _fontIndex;
ToUnicodeMap _toUnicodeMap; ///< maps from char indexes to unicode points
};
class VirtualFontProxy : public VirtualFont {
friend class VirtualFontImpl;
public:
Font* clone (double ds, double ss) const override {return new VirtualFontProxy(*this, ds, ss);}
const Font* uniqueFont () const override {return _vf;}
std::string name () const override {return _vf->name();}
const DVIVector* getDVI (int c) const override {return _vf->getDVI(c);}
double designSize () const override {return _dsize;}
double scaledSize () const override {return _ssize;}
double charWidth (int c) const override {return _vf->charWidth(c);}
double charDepth (int c) const override {return _vf->charDepth(c);}
double charHeight (int c) const override {return _vf->charHeight(c);}
double italicCorr (int c) const override {return _vf->italicCorr(c);}
const FontMetrics* getMetrics () const override {return _vf->getMetrics();}
const char* path () const override {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_t c, DVIVector &&dvi) override {}
private:
const VirtualFont *_vf;
double _dsize; ///< design size in PS point units
double _ssize; ///< scaled size in PS point units
};
class VirtualFontImpl : public VirtualFont, public TFMFont {
friend class VirtualFont;
public:
Font* clone (double ds, double ss) const override {return new VirtualFontProxy(this, ds, ss);}
const Font* uniqueFont () const override {return this;}
const DVIVector* getDVI (int c) const override;
const char* path () const override;
protected:
VirtualFontImpl (const std::string &name, uint32_t checksum, double dsize, double ssize);
void assignChar (uint32_t c, DVIVector &&dvi) override;
private:
std::map<uint32_t, DVIVector> _charDefs; ///< dvi subroutines defining the characters
};
struct FontException : public MessageException
{
FontException (const std::string &msg) : MessageException(msg) {}
};
#endif
|