kc3-lang/ftgl/src/FTPixmapGlyph.cpp

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• Hash : 0998d99d
  Author :
  Date : 2003-07-23T09:06:07
  

  Fixed precision conversion

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• src/FTPixmapGlyph.cpp

• #include    "FTPixmapGlyph.h"
  
  FTPixmapGlyph::FTPixmapGlyph( FT_Glyph glyph)
  :   FTGlyph( glyph),
      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_normal, 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;
      
     // FIXME What about dest alignment?
      destWidth = srcWidth;
      destHeight = srcHeight;
      
      if( destWidth && destHeight)
      {
          data = new unsigned char[destWidth * destHeight * 4];
      
          // Get the current glColor.
          float ftglColour[4];
          glGetFloatv( GL_CURRENT_COLOR, ftglColour);
  
          unsigned char redComponent =   static_cast<unsigned char>( ftglColour[0] * 255.0f);
          unsigned char greenComponent = static_cast<unsigned char>( ftglColour[1] * 255.0f);
          unsigned char blueComponent =  static_cast<unsigned char>( ftglColour[2] * 255.0f);
  
          unsigned char* src = source->buffer;
  
          unsigned char* dest = data + ((destHeight - 1) * destWidth) * 4;
          size_t destStep = destWidth * 4 * 2;
  
          if( ftglColour[3] == 1.0f)
          {
              for( int y = 0; y < srcHeight; ++y)
              {
                  for( int x = 0; x < srcWidth; ++x)
                  {
                      *dest++ = redComponent;
                      *dest++ = greenComponent;
                      *dest++ = blueComponent;
                      *dest++ = *src++;
                  }
                  dest -= destStep;
              }
          }
          else
          {
              for( int y = 0; y < srcHeight; ++y)
              {
                  for( int x = 0; x < srcWidth; ++x)
                  {
                      *dest++ = redComponent;
                      *dest++ = greenComponent;
                      *dest++ = blueComponent;
                      *dest++ = static_cast<unsigned char>(ftglColour[3] * *src++);
                  }
                  dest -= destStep;
              }
          }
  
          destHeight = srcHeight;
      }
  
      pos.x = bitmap->left;
      pos.y = srcHeight - bitmap->top;
      
      // Is this the right place to do this?
      FT_Done_Glyph( glyph );
  }
  
  
  FTPixmapGlyph::~FTPixmapGlyph()
  {
      delete [] data;
  }
  
  
  float FTPixmapGlyph::Render( const FTPoint& pen)
  {
      if( data)
      {
          // Move the glyph origin
          glBitmap( 0, 0, 0.0f, 0.0f, pen.x + pos.x, pen.y - pos.y, (const GLubyte*)0);
  
          glPixelStorei( GL_UNPACK_ROW_LENGTH, 0);
  
          glDrawPixels( destWidth, destHeight, GL_RGBA, GL_UNSIGNED_BYTE, (const GLvoid*)data);
          
          // Restore the glyph origin
          glBitmap( 0, 0, 0.0f, 0.0f, -pen.x - pos.x, -pen.y + pos.y, (const GLubyte*)0);
      }
  
      return advance;
  }
  

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