hgcutils.asm

来自「开放源码的编译器open watcom 1.6.0版的源代码」· 汇编 代码 · 共 74 行

;*****************************************************************************
;*
;*                            Open Watcom Project
;*
;*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
;*
;*  ========================================================================
;*
;*    This file contains Original Code and/or Modifications of Original
;*    Code as defined in and that are subject to the Sybase Open Watcom
;*    Public License version 1.0 (the 'License'). You may not use this file
;*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
;*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
;*    provided with the Original Code and Modifications, and is also
;*    available at www.sybase.com/developer/opensource.
;*
;*    The Original Code and all software distributed under the License are
;*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
;*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
;*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
;*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
;*    NON-INFRINGEMENT. Please see the License for the specific language
;*    governing rights and limitations under the License.
;*
;*  ========================================================================
;*
;* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
;*               DESCRIBE IT HERE!
;*
;*****************************************************************************


include graph.inc

        modstart hgcutils,WORD

        xdefp   _HercMoveUp_
        xdefp   _HercMoveDown_

;=========================================================================
;
;   Movement primitives
;
;   Input       ES:EDI      screen memory
;               AL          colour
;               CH          mask
;
;   Output      same        altered as per move
;
;=========================================================================

        db      E_HercMoveUp-_HercMoveUp_
_HercMoveUp_:
        add     di,6000h
        _if     s
          sub     di,8000h-90           ; sub 2000h
        _endif
        sub     di,90
E_HercMoveUp:
        ret

        db      E_HercMoveDown-_HercMoveDown_
_HercMoveDown_:
        sub     di,6000h
        _if     s
          add     di,8000h-90           ; add 2000h
        _endif
        add     di,90
E_HercMoveDown:
        ret

        endmod hgcutils
        end