## Presentation Device Driver Reference for OS/2

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### GreEqualRegion - Syntax

Simulation support:

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

Description

GreEqualRegion checks whether two regions, owned by the device that is identified by hdc, are identical. An error is raised when either region is currently selected as the clip region.

This function can be hooked by the presentation driver.

    #define INCL_GRE_REGIONS

    #include <os2.h>

    HDC      hdc;        /*  Device context handle. */

    HRGN     hrgnSrc1;   /*  First region handle. */

    HRGN     hrgnSrc2;   /*  Second region handle. */

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

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

    LONG     rc;         /*  Return codes. */

    rc = GreEqualRegion(hdc, hrgnSrc1, hrgnSrc2,

           pInstance, lFunction);