Simulation support:

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

Description

GreQueryClipRegion returns the handle of the currently selected clip region, or NULL (if none exists).

This function can be hooked by the presentation driver.

#define INCL_GRE_CLIP
#include <os2.h>

HDC      hdc;        /*  Device context handle. */
PVOID    pInstance;  /*  Pointer to instance data. */
ULONG    lFunction;  /*  High-order WORD=flags; low-order WORD=NGreQueryClipRegion. */
HRGN     rc;         /*  This function returns the handle of the clip region: */

rc = GreQueryClipRegion(hdc, pInstance, lFunction);