//image is 100x20. image is using the pixels from 10 <= x <= 90 for the tiled part.
    part.x = 10;
    part.y = 0;
    part.w = box.w - 20;
    part.h = 20;
   
    //apply_surface( x, y, source, destination)
    apply_surface( box.x+10, box.y, tile_surface( part.w, part.h, imgPlatform, &part ), screen );

SDL_Surface *tile_surface( int width, int height, SDL_Surface* source, SDL_Rect* clip = NULL )
{
    SDL_Surface* outputImage = NULL;
    SDL_Rect offset;
    int tiledWidth =2, tiledHeight =2; // On purpose to just make a simple 2x2 tile for debugging.
    //tiledWidth = width / clip.w; //Constants to be changed to new parameters.
    //tiledHeight = height / clip.h;
   
    for ( int y = 0; y < tiledHeight; y++ )
    {
        for ( int x = 0; x < tiledWidth; x++ )
        {
            apply_surface( x*clip.w, y*clip.h, source, outputImage, clip);
        }
    }
   
    return outputImage;
}