## Presentation Device Driver Reference for OS/2

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### GreRestoreRegion

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    Syntax
    Parameters
    Returns
    Remarks
    Glossary

Simulation support:

This function is simulated by a handling routine in the graphics engine.

Description

GreRestoreRegion is called during RestoreDC and CloseDC to allow the region handling routines to restore their local data structures. When a DC is closed, GreRestoreRegion is called with a count of 0 to free its local data . The clip region currently selected into the DC is deleted by this function.

This function can be hooked by the presentation driver.

    #define INCL_GRE_CLIP

    #include <os2.h>

    HDC      hdc;        /*  Device context handle. */

    LONG     cSave;      /*  DC save level. */

    PVOID    pInstance;  /*  Pointer to instance data. */

    ULONG    lFunction;  /*  High-order WORD=flags; low-order WORD=NGreRestoreRegion.
      * /

    BOOL       fSuccess ;     / *    Return   codes .   * /

    fSuccess   =   GreRestoreRegion ( hdc ,   cSave ,   pInstance ,

                   lFunction ) ;