Simulation support:

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

Description

GreSaveRegion is called during SaveDC and OpenDC to allow the region handling routines to save their local data structures. When a new DC is created, GreSaveRegion is called with a save level of 1 to initialize its local data. A Save with a count of one more than the current save level generates intervening levels. A negative save value is invalid. When initializing a new DC, a valid visible region handle must be created.

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. This must not be a negative value. */
PVOID    pInstance;  /*  Pointer to instance data. */
ULONG    lFunction;  /*  High-order WORD=flags; low-order WORD=NGreSaveRegion. */
BOOL     fSuccess;   /*  Return codes. */

fSuccess = GreSaveRegion(hdc, cSave, pInstance,
             lFunction);