kc3-lang/ftgl/src/FTVectoriser.cpp

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• Hash : b5c018d9
  Author :
  Date : 2003-07-18T10:13:27
  

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• src/FTVectoriser.cpp

• #include    "FTVectoriser.h"
  #include    "FTGL.h"
  
  #ifndef CALLBACK
  #define CALLBACK
  #endif
  
  #ifdef __APPLE_CC__    
      typedef GLvoid (*GLUTesselatorFunction)(...);
  #elif defined( __mips ) || defined( __linux__ ) || defined( __FreeBSD__ ) || defined( __OpenBSD__ ) || defined( __sun )
      typedef GLvoid (*GLUTesselatorFunction)();
  #elif defined ( WIN32)
      typedef GLvoid (CALLBACK *GLUTesselatorFunction)( );
  #else
      #error "Error - need to define type GLUTesselatorFunction for this platform/compiler"
  #endif
  
  
  void CALLBACK ftglError( GLenum errCode, FTMesh* mesh)
  {
      mesh->Error( errCode);
  }
  
  
  void CALLBACK ftglVertex( void* data, FTMesh* mesh)
  {
      FTGL_DOUBLE* vertex = static_cast<FTGL_DOUBLE*>(data);
      mesh->AddPoint( vertex[0], vertex[1], vertex[2]);
  }
  
  
  void CALLBACK ftglCombine( FTGL_DOUBLE coords[3], void* vertex_data[4], GLfloat weight[4], void** outData, FTMesh* mesh)
  {
      FTGL_DOUBLE* vertex = static_cast<FTGL_DOUBLE*>(coords);
      *outData = mesh->Combine( vertex[0], vertex[1], vertex[2]);
  }
          
  
  void CALLBACK ftglBegin( GLenum type, FTMesh* mesh)
  {
      mesh->Begin( type);
  }
  
  
  void CALLBACK ftglEnd( FTMesh* mesh)
  {
      mesh->End();
  }
  
  
  FTMesh::FTMesh()
  :	currentTesselation(0),
      err(0)
  {
      tesselationList.reserve( 16);
  }
  
  
  FTMesh::~FTMesh()
  {
      for( size_t t = 0; t < tesselationList.size(); ++t)
      {
          delete tesselationList[t];
      }
      
      tesselationList.clear();
  }
  
  
  void FTMesh::AddPoint( const FTGL_DOUBLE x, const FTGL_DOUBLE y, const FTGL_DOUBLE z)
  {
      currentTesselation->AddPoint( x, y, z);
  }
  
  
  FTGL_DOUBLE* FTMesh::Combine( const FTGL_DOUBLE x, const FTGL_DOUBLE y, const FTGL_DOUBLE z)
  {
      tempPointList.push_back( FTPoint( x, y,z));
      return &tempPointList.back().x;
  }
  
  
  void FTMesh::Begin( GLenum meshType)
  {
      currentTesselation = new FTTesselation( meshType);
  }
  
  
  void FTMesh::End()
  {
      tesselationList.push_back( currentTesselation);
  }
  
  
  const FTTesselation* const FTMesh::Tesselation( unsigned int index) const
  {
      return ( index < tesselationList.size()) ? tesselationList[index] : NULL;
  }
  
  
  FTVectoriser::FTVectoriser( const FT_Glyph glyph)
  :   contourList(0),
      mesh(0),
      ftContourCount(0),
      contourFlag(0)
  {
      if( glyph)
      {
          FT_OutlineGlyph outline = (FT_OutlineGlyph)glyph;
          ftOutline = outline->outline;
          
          ftContourCount = ftOutline.n_contours;;
          contourList = 0;
          contourFlag = ftOutline.flags;
          
          ProcessContours();
      }
  }
  
  
  FTVectoriser::~FTVectoriser()
  {
      for( size_t c = 0; c < ContourCount(); ++c)
      {
          delete contourList[c];
      }
  
      delete [] contourList;
      delete mesh;
  }
  
  
  void FTVectoriser::ProcessContours()
  {
      short contourLength = 0;
      short startIndex = 0;
      short endIndex = 0;
      
      contourList = new FTContour*[ftContourCount];
      
      for( short contourIndex = 0; contourIndex < ftContourCount; ++contourIndex)
      {
          FT_Vector* pointList = &ftOutline.points[startIndex];
          char* tagList = &ftOutline.tags[startIndex];
          
          endIndex = ftOutline.contours[contourIndex];
          contourLength =  ( endIndex - startIndex) + 1;
  
          FTContour* contour = new FTContour( pointList, tagList, contourLength);
          
          contourList[contourIndex] = contour;
          
          startIndex = endIndex + 1;
      }
  }
  
  
  size_t FTVectoriser::PointCount()
  {
      size_t s = 0;
      for( size_t c = 0; c < ContourCount(); ++c)
      {
          s += contourList[c]->PointCount();
      }
      
      return s;
  }
  
  
  const FTContour* const FTVectoriser::Contour( unsigned int index) const
  {
      return ( index < ContourCount()) ? contourList[index] : NULL;
  }
  
  
  void FTVectoriser::MakeMesh( FTGL_DOUBLE zNormal)
  {
      if( mesh)
      {
          delete mesh;
      }
          
      mesh = new FTMesh;
      
      GLUtesselator* tobj = gluNewTess();
  
      gluTessCallback( tobj, GLU_TESS_BEGIN_DATA,     (GLUTesselatorFunction)ftglBegin);
      gluTessCallback( tobj, GLU_TESS_VERTEX_DATA,    (GLUTesselatorFunction)ftglVertex);
      gluTessCallback( tobj, GLU_TESS_COMBINE_DATA,   (GLUTesselatorFunction)ftglCombine);
      gluTessCallback( tobj, GLU_TESS_END_DATA,       (GLUTesselatorFunction)ftglEnd);
      gluTessCallback( tobj, GLU_TESS_ERROR_DATA,     (GLUTesselatorFunction)ftglError);
      
      if( contourFlag & ft_outline_even_odd_fill) // ft_outline_reverse_fill
      {
          gluTessProperty( tobj, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_ODD);
      }
      else
      {
          gluTessProperty( tobj, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_NONZERO);
      }
      
      
      gluTessProperty( tobj, GLU_TESS_TOLERANCE, 0);
      gluTessNormal( tobj, 0.0f, 0.0f, zNormal);
      gluTessBeginPolygon( tobj, mesh);
      
          for( size_t c = 0; c < ContourCount(); ++c)
          {
              const FTContour* contour = contourList[c];
  
              gluTessBeginContour( tobj);
              
                  for( size_t p = 0; p < contour->PointCount(); ++p)
                  {
                      FTGL_DOUBLE* d = const_cast<FTGL_DOUBLE*>(&contour->Point(p).x);
                      gluTessVertex( tobj, d, d);
                  }
  
              gluTessEndContour( tobj);
          }
          
      gluTessEndPolygon( tobj);
  
      gluDeleteTess( tobj);
  }
  
  

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