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for (int y=0;y<SCREEN_HEIGHT; y+=bg->h)
    for (int x=0;x<SCREEN_WIDTH; x+=bg->w)
        apply_surface(x,y,bg,screen);
Uint8* keystates=SDL_GetKeyState(NULL);
if(keystates[SDLK_UP])
    apply_surface((SCREEN_WIDTH-up->w)/2,SCREEN_HEIGHT/2-2*up->h,up,screen);
if(keystates[SDLK_DOWN])
    apply_surface((SCREEN_WIDTH-down->w)/2,SCREEN_HEIGHT/2+down->h,down,screen);
if(keystates[SDLK_LEFT])
    apply_surface(SCREEN_WIDTH/2-2*left->w,(SCREEN_HEIGHT-left->h)/2,left,screen);
if(keystates[SDLK_RIGHT])
    apply_surface(SCREEN_WIDTH/2+right->w,(SCREEN_HEIGHT-right->h)/2,right,screen);