kc3-lang/ftgl/src/FTFont.cpp

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• Hash : 9013e3ec
  Author :
  Date : 2002-06-20T08:22:06
  

  Changes for VTK Removed tabs Removed mmgr Optimisations for loading pixel based fonts Minor changes

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• src/FTFont.cpp

• #include    "FTFace.h"
  #include    "FTFont.h"
  #include    "FTGlyphContainer.h"
  #include    "FTGlyph.h" // for FTBbox
  
  
  FTFont::FTFont()
  :   numFaces(0),
      glyphList(0),
      numGlyphs(0),
      preCache(true),
      err(0)
  {
      pen.x = 0;
      pen.y = 0;
  }
  
  
  FTFont::~FTFont()
  {
      Close();
  }
  
  
  bool FTFont::Open( const char* fontname, bool p)
  {
      preCache = p;
      
      if( face.Open( fontname))
      {
          FT_Face* ftFace = face.Face();      
          numGlyphs = (*ftFace)->num_glyphs;
          
          return true;
      }
      else
      {
          err = face.Error();
          return false;
      }
  }
  
  
  bool FTFont::Open( const unsigned char *pBufferBytes, size_t bufferSizeInBytes, bool p )
  {
      preCache = p;
      
      if( face.Open( pBufferBytes, bufferSizeInBytes ))
      {
          FT_Face* ftFace = face.Face();      
          numGlyphs = (*ftFace)->num_glyphs;
          
          return true;
      }
      else
      {
          err = face.Error();
          return false;
      }
  }
  
  
  bool FTFont::Attach( const char* filename)
  {
      return face.Attach( filename);
  }
  
  
  void FTFont::Close()
  {
      delete glyphList;
  }
  
  
  bool FTFont::FaceSize( const unsigned int size, const unsigned int res )
  {
      charSize = face.Size( size, res);
  
      if( glyphList)
          delete glyphList;
      
      glyphList = new FTGlyphContainer( &face, numGlyphs, preCache);
      
      if( MakeGlyphList())
      {
          return true;
      }
      else
      {
          return false;
      }
  }
  
  
  bool FTFont::MakeGlyphList()
  {
      for( unsigned int c = 0; c < numGlyphs; ++c)
      {
          if( preCache)
          {
              glyphList->Add( MakeGlyph( c), c);
          }
          else
          {
              glyphList->Add( NULL, c);
          }
      }
      
      return !err; // FIXME what err?
  }
  
  
  bool FTFont::CharMap( FT_Encoding encoding)
  {
      err = face.CharMap( encoding);
      return !err;
  }
  
  
  int FTFont::Ascender() const
  {
      return charSize.Ascender();
  }
  
  
  int FTFont::Descender() const
  {
      return charSize.Descender();
  }
  
  
  void FTFont::BBox( const char* string,
                     float& llx, float& lly, float& llz, float& urx, float& ury, float& urz)
  {
      const unsigned char* c = (unsigned char*)string;
      llx = lly = llz = urx = ury = urz = 0;
      FTBBox bbox;
   
      while( *c)
      {
          if( !glyphList->Glyph( static_cast<unsigned int>(*c)))
          {
              unsigned int g = face.CharIndex( static_cast<unsigned int>(*c));
              glyphList->Add( MakeGlyph( g), g);
          }
          
          bbox = glyphList->BBox( *c);
          
          // Lower extent
          lly = lly < bbox.y1 ? lly: bbox.y1;
          // Upper extent
          ury = ury > bbox.y2 ? ury: bbox.y2;
          // Depth
          urz = urz < bbox.z2 ? urz: bbox.z2;
  
          // Width
          urx += glyphList->Advance( *c, *(c + 1));
          ++c;
      }
      
      //Final adjustments
      llx = glyphList->BBox( *string).x1;
      urx -= glyphList->Advance( *(c - 1), 0);
      urx += bbox.x2;
  
  }
  
  void FTFont::BBox( const wchar_t* string,
                     float& llx, float& lly, float& llz, float& urx, float& ury, float& urz)
  {
      const wchar_t* c = string;
      llx = lly = llz = urx = ury = urz = 0;
      FTBBox bbox;
   
      while( *c)
      {
          if( !glyphList->Glyph( static_cast<unsigned int>(*c)))
          {
              unsigned int g = face.CharIndex( static_cast<unsigned int>(*c));
              glyphList->Add( MakeGlyph( g), g);
          }
          
          bbox = glyphList->BBox( *c);
          
          // Lower extent
          lly = lly < bbox.y1 ? lly: bbox.y1;
          // Upper extent
          ury = ury > bbox.y2 ? ury: bbox.y2;
          // Depth
          urz = urz < bbox.z2 ? urz: bbox.z2;
  
          // Width
          urx += glyphList->Advance( *c, *(c + 1));
          ++c;
      }
      
      //Final adjustments
      llx = glyphList->BBox( *string).x1;
      urx -= glyphList->Advance( *(c - 1), 0);
      urx += bbox.x2;
  
  }
  
  
  float FTFont::Advance( const wchar_t* string)
  {
      const wchar_t* c = string;
      float width = 0;
  
      while( *c)
      {
          width += doAdvance( *c, *(c + 1));
          ++c;
      }
  
      return width;
  }
  
  
  float FTFont::Advance( const char* string)
  {
      const unsigned char* c = (unsigned char*)string;
      float width = 0;
  
      while( *c)
      {
          width += doAdvance( *c, *(c + 1));
          ++c;
      }
  
      return width;
  }
  
  
  float FTFont::doAdvance( const unsigned int chr, const unsigned int nextChr)
  {
      if( !glyphList->Glyph( chr))
      {
          unsigned int g = face.CharIndex( chr);
          glyphList->Add( MakeGlyph( g), g);
      }
  
      return glyphList->Advance( chr, nextChr);
  }
  
  
  void FTFont::render( const char* string )
  {
      const unsigned char* c = (unsigned char*)string;
      pen.x = 0; pen.y = 0;
  
      while( *c)
      {
          doRender( *c, *(c + 1));
          ++c;
      }
  }
  
  
  void FTFont::render( const wchar_t* string )
  {
      const wchar_t* c = string;
      pen.x = 0; pen.y = 0;
  
      while( *c)
      {
          doRender( *c, *(c + 1));
          ++c;
      }
  }
  
  
  void FTFont::doRender( const unsigned int chr, const unsigned int nextChr)
  {
      if( !glyphList->Glyph( chr))
      {
          unsigned int g = face.CharIndex( chr);
          glyphList->Add( MakeGlyph( g), g);
      }
  
      FT_Vector kernAdvance = glyphList->render( chr, nextChr, pen);
      
      pen.x += kernAdvance.x;
      pen.y += kernAdvance.y;
  }
  
  

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