Bitmap img(xxx);
Graphics gr(&img);
HDC dc = gr.GetHDC();
::StretchDIBits(
    dc,
    rec.left, rec.top,
    (rec.right - rec.left), (rec.bottom - rec.top),
    m_recRegin.left , m_recRegin.top,
    m_recRegin.right - m_recRegin.left, m_recRegin.bottom - m_recRegin.top,
    XXX, XXX, DIB_RGB_COLORS, SRCCOPY);
gr.ReleaseHDC(dc);

::StretchDIBits(dc,rec.left, rec.top,(rec.right - rec.left), (rec.bottom - rec.top),
   m_recRegin.left , m_recRegin.top,
   (m_recRegin.right - m_recRegin.left),(m_recRegin.bottom - m_recRegin.top),XXX,&bmp,DIB_RGB_COLORS, SRCCOPY);