Simulation support:

None.

Description

GreEscape DEVESC_EXTGET is called by EnDIVE users to copy an image from the screen to system memory or to off-screen video memory. This function should be called only when the image needs to be returned in a compressed format. If the hardware does not support compression, then this call should not be implemented.

The various compression formats supported by the hardware are returned in the GreEscape DEVESC_EXTQUERY function.

Users of this function are responsible for bracketing access to video memory and this function with GreEscape DEVESC_HWREQUEST.

#define INCL_GRE_DEVICE
#include <os2.h>

HDC      hdc;         /*  Device context handle. */
LONG     ICODE;       /*  DEVESC_EXTGET escape code. */
LONG     lInCount;    /*  Number of bytes pointed to by pbInData. */
PBYTE    pbInData;    /*  Pointer to IMAGEPACK data structure. */
PLONG    plOutCount;  /*  NULL. */
PLONG    pbOutData;   /*  NULL. */
LONG     rc;          /*  Return Codes. */

rc = GreEscape(hdc, ICODE, lInCount, pbInData,
       plOutCount, pbOutData);