I83 Answer ― Set Rectangle

void flood( colorImage image, pixel pix)
{
  int r, c;
  pixel p;

  for ( r=0; r<image.nrows; r++ )
    for ( c=0; c<image.ncols; c++ )
    {
      p = getColorPixel( image, r, c );
      if ( p.red == 0 && p.blu == 0 && p.grn == 0 )
        setColorPixel( image, r, c, pix );
    }
}

void fill( colorImage image, pixel pix)
{
  int r, c;
  pixel p;

  for ( r=0; r<image.nrows; r++ )
    for ( c=0; c<image.ncols; c++ )
      setColorPixel( image, r, c, pix );
}

Comments: