## Presentation Device Driver Reference for OS/2

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### GreCombineRectRegion

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    Syntax
    Parameters
    Returns
    Glossary

Simulation support:

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

Description

GreCombineRectRegion combines a region with a rectangle to make a new region. If COM_TRANSFORM is not set, the function expects the point to be in device coordinates. The destination region can be the same as the source region. An error is raised if either of the regions specified is currently selected as the clip region. The source and destination regions must be of the same device class.

This function can be hooked by the presentation driver.

    #define INCL_GRE_REGIONS

    #include <os2.h>

    HDC       hdc;        /*  Device context handle. */

    HRGN      hrgnDst;    /*  Destination region handle. */

    PRECTL    prclRect;   /*  Pointer to rectangle. */

    HRGN      hrgnSrc;    /*  Region handle. */

    LONG      cmdMode;    /*  Method of combination. */

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

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

    LONG      rc;

    rc = GreCombineRectRegion(hdc, hrgnDst, prclRect,

           hrgnSrc, cmdMode, pInstance, lFunction);