CBitmap bitmapBkgnd;

bitmapBkgnd.Attach (LoadBitmap (AfxGetInstanceHandle(),
                    MAKEINTRESOURCE(m_iBitmapId)));


BOOL CTestbed2Dlg::OnEraseBkgnd(CDC* pDC)
{
   CRect rect;
   GetClientRect(&rect);
   CDC dc;
   dc.CreateCompatibleDC(pDC);
   CBitmap* pOldBitmap = dc.SelectObject(&bitmapBkgnd);
   int iBitmapWidth, iBitmapHeight ;
   int ixOrg, iyOrg;

   BITMAP bm;
   bitmapBkgnd.GetObject(sizeof(BITMAP),&bm);
   iBitmapWidth = bm.bmWidth;
   iBitmapHeight = bm.bmHeight;

   // If our bitmap is smaller than the background and tiling is
   // supported, tile it. Otherwise watch the efficiency - don't
   // spend time setting up loops you won't need.

   if (iBitmapWidth  >= rect.Width() &&
       iBitmapHeight >= rect.Height() )
   {
      pDC->BitBlt (rect.left,
                   rect.top,
                   rect.Width(),
                   rect.Height(),
                   &dc,
                   0, 0, SRCCOPY);
   }
   else
   {
      for (iyOrg = 0; iyOrg < rect.Height(); iyOrg += iBitmapHeight)
      {
         for (ixOrg = 0; ixOrg < rect.Width(); ixOrg += iBitmapWidth)
         {
            pDC->BitBlt (ixOrg,
                         iyOrg,
                         rect.Width(),
                         rect.Height(),
                         &dc,
                         0, 0, SRCCOPY);
         }
      }
   }

   dc.SelectObject(pOldBitmap);
   return TRUE;
}