Simulation support:

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

Description

GreRegionSelectBitmap is called when a new bit-map handle is selected into a memory DC. It removes the old visible region and informs the presentation driver that the DC region must be recalculated.

Note: In a nondisplay DC, the visible region represents the device boundary.

This function can be hooked by the presentation driver.

#define INCL_GRE_CLIP
#include <os2.h>

HDC        hdc;        /*  Device context handle. */
HBITMAP    hbm;        /*  Handle of bit map to be selected. */
PVOID      pInstance;  /*  Pointer to instance data. */
ULONG      lFunction;  /*  High-order WORD=flags; low-order WORD=NGreRegionSelectBitmap. */
BOOL       fSuccess;   /*  Return codes. */

fSuccess = GreRegionSelectBitmap(hdc, hbm,
             pInstance, lFunction);