＞１
#define bmp_width 64
#define bmp_height 640
#define screen_width 64
#define screen_height 240

int a=0;
HDC buf,bmp;//それぞれSelectObjectでビットマップをセットしておく
//メインループ
while(0){

a+=10;
BitBlt(buf,0,0,screen_width,screen_height,bmp,0,a,SRCCOPY);
BitBlt(buf,screen_width,0,screen_width,screen_height,bmp,0,a,SRCCOPY);
BitBlt(buf,screen_width*2,0,screen_width,screen_height,bmp,0,a,SRCCOPY);

if(a>bmp_height){
a=a-bmp_height0;
}

}