LASi.h

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#ifndef LASI_H
#define LASI_H

#include <string>
#include <ostream>
#include <sstream>
#include <map>
#include <pango/pango.h>
#include <freetype/ftglyph.h>

class FreetypeGlyphMgr;
class ContextMgr;

namespace LASi {

  enum FontStyle{
    NORMAL_STYLE,
    OBLIQUE,
    ITALIC
  };

  enum FontWeight{
    ULTRALIGHT,
    LIGHT,
    NORMAL_WEIGHT,
    BOLD,
    ULTRABOLD,
    HEAVY
  };

  enum FontVariant{
    NORMAL_VARIANT,
    SMALLCAPS
  };

  enum FontStretch{
    ULTRACONDENSED,
    EXTRACONDENSED,
    CONDENSED,
    SEMICONDENSED,
    NORMAL_STRETCH,
    SEMIEXPANDED,
    EXPANDED,
    EXTRAEXPANDED,
    ULTRAEXPANDED
  };
  
  class PostscriptDocument;
  class write_glyph_routine_to_stream;

  class oPostscriptStream : public std::ostringstream {
    public:
      friend class PostscriptDocument;
      friend class show;
      friend class setFont;
      friend class setFontSize;

      oPostscriptStream(PostscriptDocument& psDoc) : _psDoc(psDoc) {}

    protected:
      PostscriptDocument& doc() {return _psDoc;}

    private:
      PostscriptDocument& _psDoc;
  };

  template<class T>
    inline oPostscriptStream& operator<<(oPostscriptStream& os, T t) {
      static_cast<std::ostream&>(os) << t;
      return os;
    }

  class PostscriptDocument {
    public:
      friend class write_glyph_routine_to_stream; // helper class
      friend class show;

      PostscriptDocument::PostscriptDocument();
      PostscriptDocument::~PostscriptDocument();

      void setFont(
          const char* const family = "sans",
          LASi::FontStyle   = LASi::NORMAL_STYLE,
          LASi::FontWeight  = LASi::NORMAL_WEIGHT,
          LASi::FontVariant = LASi::NORMAL_VARIANT,
          LASi::FontStretch = LASi::NORMAL_STRETCH
      );

      void setFontSize(const double size) {_fontSize = size;}

      std::ostringstream& osHeader() {return _osHeader;}

      oPostscriptStream& osBody() {return _osBody;}

      oPostscriptStream& osFooter() {return _osFooter;}

      void write(std::ostream& os);

      void get_dimensions(const char* s, double *lineSpacing, double *xAdvance=NULL, double *yMin=NULL, double *yMax=NULL);

    protected:
      class GlyphId {
        public:
          friend bool operator==(const GlyphId id1, const GlyphId id2) {
            return id1._str == id2._str;
          }

          friend bool operator<(const GlyphId id1, const GlyphId id2) {
            return id1._str < id2._str;
          }

          GlyphId() {}
          GlyphId(FT_Face, const FT_UInt);

          std::string str() const {return _str;}

        private:
          std::string _str;
      };

      typedef std::map<GlyphId, FreetypeGlyphMgr> GlyphMap;

      typedef void (PostscriptDocument::*GLYPH_FUNC)(
          const GlyphMap::value_type&, void* contextData);

      void invoke_glyph_routine(const GlyphMap::value_type&, void* contextData);

      void accrue_dimensions( const GlyphMap::value_type&, void* contextData1);

      void for_each_glyph_do(const std::string&, const GLYPH_FUNC, void* contextData);

      PangoContext* PostscriptDocument::pangoContext() const;

      std::string glyphProcName() const;

      double getFontSize() {return _fontSize;}

      class write_glyph_routine_to_stream {
        private:
          std::ostream& os;
          PangoContext* pangoCtx;

        public:
          write_glyph_routine_to_stream(std::ostream& os, PangoContext* pangoCtx) 
            : os(os), pangoCtx(pangoCtx) {}
          void operator()(PostscriptDocument::GlyphMap::value_type v);
      };

    private:
      GlyphMap _glyphMap;

      static const unsigned int DRAWING_SCALE;

      // Use pointers instead of objects in order to minimize namespace pollution of .h file user
      // Requires fwd declarations above.
      ContextMgr* _pContextMgr;     // manage PangoContext*
      double _fontSize;             // font size to be used when rendering next show()
      std::ostringstream _osHeader; // Postscript header
      oPostscriptStream _osBody;    // Postscript body
      oPostscriptStream _osFooter;  // Postscript footer
  };

  class setFont {
    public:
      friend inline oPostscriptStream& operator<<(oPostscriptStream& os, const setFont& x) {
        x.apply(os);
        return os;
      }

      setFont(
          const char* const family = "sans",
          const LASi::FontStyle   style   = LASi::NORMAL_STYLE,
          const LASi::FontWeight  weight  = LASi::NORMAL_WEIGHT,
          const LASi::FontVariant variant = LASi::NORMAL_VARIANT,
          const LASi::FontStretch stretch = LASi::NORMAL_STRETCH )
          : _family(family), _style(style), _weight(weight), _variant(variant), _stretch(stretch)
      {}
      
    protected:
      void apply(oPostscriptStream& os) const {
        os.doc().setFont(_family, _style,_weight, _variant,  _stretch);
      }

    private:
      const char* const  _family;
      const LASi::FontStyle   _style;
      const LASi::FontWeight  _weight;
      const LASi::FontVariant _variant;
      const LASi::FontStretch _stretch;
      
  };

  class setFontSize {
    public:
      friend inline oPostscriptStream& operator<<(oPostscriptStream& os, const setFontSize& x) {
        x.apply(os);
        return os;
      }

      setFontSize(double size) : _size(size) {}

    protected:
      void apply(oPostscriptStream& os) const {
        os.doc().setFontSize(_size);
      }

    private:
      double _size;
  };

  class show{
    public:
      friend inline oPostscriptStream& operator<<(oPostscriptStream& os, const show& x) {
        x.apply(os);
        return os;
      }

      show(const char* str) : _str(str) {}

    protected:
      void apply(oPostscriptStream& os) const;

    private:
      std::string _str;
  };
}
#endif

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