C / C++ / MFC

IDirectDrawSurface * DDLoadBitmap(win* p,IDirectDraw *pdd, LPCTSTR szBitmap)<br />
{<br />
    HBITMAP hbm;<br />
    BITMAP bm;<br />
    IDirectDrawSurface *pdds;<br />
<br />
   hbm=SHLoadDIBitmap(szBitmap);<br />
   if (hbm == NULL){<br />
           return NULL;<br />
  }<br />
<br />
    GetObject(hbm, sizeof(bm), &bm); // get size of bitmap<br />
<br />
   <br />
    // create a DirectDrawSurface for this bitmap<br />
      <br />
    pdds = CreateOffScreenSurface(pdd, bm.bmWidth, bm.bmHeight);<br />
        if (pdds) {<br />
        DDCopyBitmap(pdds, hbm, bm.bmWidth, bm.bmHeight);<br />
    }<br />
<br />
    DeleteObject(hbm);<br />
<br />
    return pdds;<br />
}

bool_t Flip_Bitmap_To_Back(win* p)<br />
{<br />
    HRESULT ddrval;<br />
    RECT rcRectSrc;<br />
    RECT rcRectDest;<br />
    POINT pt;<br />
<br />
        // first we need to figure out where on the primary surface our window lives<br />
        pt.x = 0; pt.y = 0;<br />
        ClientToScreen(p->Wnd, &pt);<br />
        GetClientRect(p->Wnd, &rcRectDest);<br />
        OffsetRect(&rcRectDest, pt.x, pt.y);<br />
        SetRect(&rcRectSrc, 0, 0, 472, 286);   //var 472 286<br />
        ddrval =IDirectDrawSurface_Blt(p->lpDDSBack, &rcRectDest, p->lpDDSBitmap, &rcRectSrc, DDBLT_WAIT, NULL);<br />
        if(ddrval==DDERR_SURFACELOST){<br />
		   restoreAll(p);<br />
		}<br />
}