关于DrvResetPDEV的函数的处理

关于该问题，其实就是将old pdev的函数的相关现场保存，然后启动新的pdev进行设置。

If ResetDC is called during the rendering of a print document, the printer graphics DLL receives the following sequence of calls:

    dhpdevNew = DrvEnablePDEV();
    DrvResetPDEV(dhpdevOld, dhpdevNew);
    DrvDisableSurface(dhpdevOld);
    DrvDisablePDEV(dhpdevOld);
    DrvEnableSurface(dhpdevNew);
    DrvStartDoc(dhpdevNew);

If ResetDC is called between documents there is no surface associated with the PDEV, so only the following sequence of calls is made:

    dhpdevNew = DrvEnablePDEV();
    DrvResetPDEV(dhpdevOld,dhpdevNew);
    DrvDisablePDEV(dhpdevOld);