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-/*************************************************************************
-** Font.hpp **
-** **
-** This file is part of dvisvgm -- a fast DVI to SVG converter **
-** Copyright (C) 2005-2021 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 <memory>
-#include <string>
-#include <unordered_map>
-#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"
-#include "utility.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 std::unique_ptr<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=nullptr) 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 nullptr;}
- 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:
- explicit EmptyFont (std::string name) : _fontname(std::move(name)) {}
- std::unique_ptr<Font> clone (double ds, double sc) const override {return util::make_unique<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 nullptr;}
- const char* path () const override {return nullptr;}
- bool getGlyph (int c, Glyph &glyph, GFGlyphTracer::Callback *cb=nullptr) 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 std::unique_ptr<Font> create (const std::string &name, uint32_t checksum, double dsize, double ssize, PhysicalFont::Type type);
- static std::unique_ptr<Font> create (const std::string &name, int fontindex, uint32_t checksum, double dsize, double ssize);
- virtual Type type () const =0;
- bool getGlyph (int c, Glyph &glyph, GFGlyphTracer::Callback *cb=nullptr) const override;
- virtual bool getExactGlyphBox (int c, BoundingBox &bbox, GFGlyphTracer::Callback *cb=nullptr) const;
- virtual bool getExactGlyphBox (int c, GlyphMetrics &metrics, bool vertical, GFGlyphTracer::Callback *cb=nullptr) 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=nullptr) 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 std::string CACHE_PATH; ///< path to cache directory ("" 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:
- using DVIVector = std::vector<uint8_t>;
-
- public:
- static std::unique_ptr<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=nullptr) const override {return false;}
-
- protected:
- virtual void assignChar (uint32_t c, DVIVector &&dvi) =0;
-};
-
-
-class TFMFont : public virtual Font {
- public:
- TFMFont (std::string name, uint32_t cs, double ds, double ss);
- 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:
- std::unique_ptr<Font> clone (double ds, double sc) const override {
- return std::unique_ptr<PhysicalFontProxy>(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 () override;
-
- std::unique_ptr<Font> clone (double ds, double ss) const override {
- return std::unique_ptr<PhysicalFontProxy>(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;
- 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;
- FontEncodingPair _encodingPair;
- CharMapID _charmapID; ///< ID of the font's charmap to use
- std::unique_ptr<const RangeMap> _localCharMap;
-};
-
-
-class NativeFont : public PhysicalFont {
- public:
- virtual std::unique_ptr<NativeFont> clone (double ptsize, const FontStyle &style, Color color) const =0;
- std::unique_ptr<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;
- const FontMetrics* getMetrics () const override {return nullptr;}
- const FontStyle* style () const override {return &_style;}
- Color color () const override {return _color;}
- const FontMap::Entry* fontMapEntry () const override {return nullptr;}
- 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:
- std::unique_ptr<NativeFont> clone (double ptsize, const FontStyle &style, Color color) const override {
- return std::unique_ptr<NativeFontProxy>(new NativeFontProxy(this, ptsize, style, color));
- }
-
- std::unique_ptr<Font> clone (double ds, double sc) const override {
- return std::unique_ptr<NativeFontProxy>(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 (std::string fname, int fontIndex, double ptsize, const FontStyle &style, Color color)
- : NativeFont(ptsize, style, color), _path(std::move(fname)), _fontIndex(fontIndex) {}
-
- std::unique_ptr<NativeFont> clone (double ptsize, const FontStyle &style, Color color) const override {
- return std::unique_ptr<NativeFontProxy>(new NativeFontProxy(this, ptsize, style, color));
- }
-
- std::unique_ptr<Font> clone (double ds, double sc) const override {
- return std::unique_ptr<NativeFontProxy>(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:
- std::unique_ptr<Font> clone (double ds, double ss) const override {
- return std::unique_ptr<VirtualFontProxy>(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:
- std::unique_ptr<Font> clone (double ds, double ss) const override {
- return std::unique_ptr<VirtualFontProxy>(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::unordered_map<uint32_t, DVIVector> _charDefs; ///< dvi subroutines defining the characters
-};
-
-
-struct FontException : public MessageException {
- explicit FontException (const std::string &msg) : MessageException(msg) {}
-};
-
-#endif