kc3-lang/ftgl/src/FTExtrdGlyph.cpp

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  Commit

• Author : henry
  Date : 2004-10-18 21:41:36
  Hash : a2985cbf
  Message : Removed depth member var. Fixed a problem with normal generation.

• src/FTExtrdGlyph.cpp

• #include <iostream>
  
  #include    <math.h>
  
  #include    "FTExtrdGlyph.h"
  #include    "FTVectoriser.h"
  
  
  FTExtrdGlyph::FTExtrdGlyph( FT_GlyphSlot glyph, float depth, bool useDisplayList)
  :   FTGlyph( glyph),
      glList(0)
  {
      bBox.SetDepth( -depth);
          
      if( ft_glyph_format_outline != glyph->format)
      {
          err = 0x14; // Invalid_Outline
          return;
      }
  
      FTVectoriser vectoriser( glyph);
      if( ( vectoriser.ContourCount() < 1) || ( vectoriser.PointCount() < 3))
      {
          return;
      }
  
      unsigned int tesselationIndex;
      
      if(useDisplayList)
      {
          glList = glGenLists(1);
          glNewList( glList, GL_COMPILE);
      }
  
      vectoriser.MakeMesh( 1.0);
      glNormal3d(0.0, 0.0, 1.0);
      
      unsigned int horizontalTextureScale = glyph->face->size->metrics.x_ppem * 64;
      unsigned int verticalTextureScale = glyph->face->size->metrics.y_ppem * 64;        
      
      const FTMesh* mesh = vectoriser.GetMesh();
      for( tesselationIndex = 0; tesselationIndex < mesh->TesselationCount(); ++tesselationIndex)
      {
          const FTTesselation* subMesh = mesh->Tesselation( tesselationIndex);
          unsigned int polyonType = subMesh->PolygonType();
  
          glBegin( polyonType);
              for( unsigned int pointIndex = 0; pointIndex < subMesh->PointCount(); ++pointIndex)
              {
                  FTPoint point = subMesh->Point(pointIndex);
  
                  glTexCoord2f( point.X() / horizontalTextureScale,
                                point.Y() / verticalTextureScale);
                  
                  glVertex3f( point.X() / 64.0f,
                              point.Y() / 64.0f,
                              0.0f);
              }
          glEnd();
      }
      
      vectoriser.MakeMesh( -1.0);
      glNormal3d(0.0, 0.0, -1.0);
      
      mesh = vectoriser.GetMesh();
      for( tesselationIndex = 0; tesselationIndex < mesh->TesselationCount(); ++tesselationIndex)
      {
          const FTTesselation* subMesh = mesh->Tesselation( tesselationIndex);
          unsigned int polyonType = subMesh->PolygonType();
  
          glBegin( polyonType);
              for( unsigned int pointIndex = 0; pointIndex < subMesh->PointCount(); ++pointIndex)
              {
                  FTPoint point = subMesh->Point(pointIndex);
  
                  glTexCoord2f( subMesh->Point(pointIndex).X() / horizontalTextureScale,
                                subMesh->Point(pointIndex).Y() / verticalTextureScale);
                  
                  glVertex3f( subMesh->Point( pointIndex).X() / 64.0f,
                              subMesh->Point( pointIndex).Y() / 64.0f,
                              -depth);
              }
          glEnd();
      }
      
      int contourFlag = vectoriser.ContourFlag();
      
      for( size_t c = 0; c < vectoriser.ContourCount(); ++c)
      {
          const FTContour* contour = vectoriser.Contour(c);
          unsigned int numberOfPoints = contour->PointCount();
          
          glBegin( GL_QUAD_STRIP);
              for( unsigned int j = 0; j <= numberOfPoints; ++j)
              {
                  unsigned int pointIndex = ( j == numberOfPoints) ? 0 : j;
                  unsigned int nextPointIndex = ( pointIndex == numberOfPoints - 1) ? 0 : pointIndex + 1;
                  
                  FTPoint point = contour->Point(pointIndex);
  
                  FTPoint normal = GetNormal( point, contour->Point(nextPointIndex));
                  if(normal != FTPoint( 0.0f, 0.0f, 0.0f))
                  {                   
                      glNormal3dv((FTGL_DOUBLE*)normal);
                  }
  
                  if( contourFlag & ft_outline_reverse_fill)
                  {
                      glTexCoord2f( point.X() / horizontalTextureScale,
                                    point.X() / verticalTextureScale);
                  
                      glVertex3f( point.X() / 64.0f, point.Y() / 64.0f, 0.0f);
                      glVertex3f( point.X() / 64.0f, point.Y() / 64.0f, -depth);
                  }
                  else
                  {
                      glTexCoord2f( point.X() / horizontalTextureScale,
                                    point.Y() / verticalTextureScale);
                  
                      glVertex3f( point.X() / 64.0f, point.Y() / 64.0f, -depth);
                      glVertex3f( point.X() / 64.0f, point.Y() / 64.0f, 0.0f);
                  }
              }
          glEnd();
      }
          
      if(useDisplayList)
      {
          glEndList();
      }
  }
  
  
  FTExtrdGlyph::~FTExtrdGlyph()
  {
      glDeleteLists( glList, 1);
  }
  
  
  const FTPoint& FTExtrdGlyph::Render( const FTPoint& pen)
  {
      glTranslatef( pen.X(), pen.Y(), 0);
      
      if( glList)
      {
          glCallList( glList);    
      }
      
      return advance;
  }
  
  
  FTPoint FTExtrdGlyph::GetNormal( const FTPoint &a, const FTPoint &b)
  {
      float vectorX = a.X() - b.X();
      float vectorY = a.Y() - b.Y();
                                
      float length = sqrt( vectorX * vectorX + vectorY * vectorY );
      
      if( length > 0.01f)
      {
          length = 1 / length;
      }
      else
      {
          length = 0.0f;
      }
      
      return FTPoint( -vectorY * length,
                       vectorX * length,
                       0.0f);
  }