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- /*=======================================================*/
- /* DVSHADOW.C */
- /* functions dealing with shadow buffer */
- /* */
- /* (c) Copyright 1988 Ralf Brown All Rights Reserved */
- /* May be freely copied for noncommercial use, so long */
- /* as this copyright notice remains intact, and any */
- /* changes are marked in the comment blocks preceding */
- /* functions. */
- /*=======================================================*/
-
- #include "tvapi.h"
-
- /*======================================================*/
- /* DVshadow_start start shadowing video buffer, return */
- /* info about shadow buffer */
- /* Ralf Brown 6/23/88 */
- /*======================================================*/
-
- void far *DVshadow_start(int *rows,int *cols)
- {
- #ifdef __TURBOC__
- _AX = 0x2B02 ;
- _CX = 0x4445 ;
- _DX = 0x5351 ;
- geninterrupt(0x21) ;
- *rows = _BH ;
- *cols = _BL ;
- return MK_FP(_DX,0) ;
- #else
- union REGS regs ;
-
- regs.x.ax = 0x2B02 ;
- regs.x.cx = 0x4445 ;
- regs.x.dx = 0x5351 ;
- int86(0x21,®,®s) ;
- *rows = regs.h.bh ;
- *cols = regs.h.bl ;
- return MK_FP(regs.x.dx,0) ;
- #endif __TURBOC__
- }
-
- /*======================================================*/
- /* DVshadow_stop stop shadowing vidoe buffer */
- /* Ralf Brown 6/23/88 */
- /*======================================================*/
-
- void DVshadow_stop(void)
- {
- #ifdef __TURBOC__
- _AX = 0x2B05 ;
- _CX = 0x4445 ;
- _DX = 0x5351 ;
- geninterrupt(0x21) ;
- #else
- union REGS regs ;
-
- regs.x.ax = 0x2B05 ;
- regs.x.cx = 0x4445 ;
- regs.x.dx = 0x5351 ;
- int86(0x21,®s,®s) ;
- #endif __TURBOC__
- }
-
- /* End of DVSHADOW.C */
-