kc3-lang/ftgl/src/FTBitmapGlyph.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/FTBitmapGlyph.cpp

• #include    "FTBitmapGlyph.h"
  
  
  FTBitmapGlyph::FTBitmapGlyph( FT_Glyph glyph)
  :   FTGlyph(),
      destWidth(0),
      destHeight(0),
      data(0)
  {
      // This function will always fail if the glyph's format isn't scalable????
      err = FT_Glyph_To_Bitmap( &glyph, ft_render_mode_mono, 0, 1);
      if( err || ft_glyph_format_bitmap != glyph->format)
      {
          return;
      }
  
      FT_BitmapGlyph  bitmap = (FT_BitmapGlyph)glyph;
      FT_Bitmap*      source = &bitmap->bitmap;
  
      //check the pixel mode
      //ft_pixel_mode_grays
          
      int srcWidth = source->width;
      int srcHeight = source->rows;
      int srcPitch = source->pitch;
      
     // FIXME What about dest alignment?
      destWidth = srcWidth;
      destHeight = srcHeight;
      
      if( destWidth && destHeight)
      {
          data = new unsigned char[srcPitch * destHeight];
          unsigned char* dest = data + (( destHeight - 1) * srcPitch);
  
          unsigned char* src = source->buffer;
          size_t destStep = srcPitch * 2;
          
          for(int y = 0; y < srcHeight; ++y)
          {
              for(int x = 0; x < srcPitch; ++x)
              {
                  *dest++ = *src++;
              }
              
              dest -= destStep;
          }
      }
      
      bBox = FTBBox( glyph);
      advance = static_cast<float>(glyph->advance.x >> 16);
      pos.x = bitmap->left;
      pos.y = srcHeight - bitmap->top;
      
      // Is this the right place to do this?
      FT_Done_Glyph( glyph );
  }
  
  
  FTBitmapGlyph::~FTBitmapGlyph()
  {
      if( data)
          delete [] data;
  }
  
  
  float FTBitmapGlyph::Render( const FT_Vector& pen)
  {
      if( data)
      {
          // Move the glyph origin
          glBitmap( 0, 0, 0.0, 0.0, pen.x + pos.x, pen.y - pos.y, (const GLubyte *)0 );
  
          glBitmap( destWidth, destHeight, 0.0f, 0.0, 0.0, 0.0, (const GLubyte *)data);
  
          // Restore the glyph origin
          glBitmap( 0, 0, 0.0, 0.0, -pen.x - pos.x, -pen.y + pos.y, (const GLubyte *)0 );
      }
      
      return advance;
  }
  

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