while( !quit )
{
    while( SDL_PollEvent( &e ) != 0 )
    {
        if( e.type == SDL_QUIT )
        {
            quit = true;
        }
    }
    SDL_Rect stretchRect;
    stretchRect.x = 0;
    stretchRect.y = 0;
    stretchRect.w = WIDTH;
    stretchRect.h = HEIGHT;
    SDL_BlitScaled( optimizedSurface, NULL, gScreenSurface, &stretchRect );

    SDL_UpdateWindowSurface( gWindow );
}