pixel.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 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
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


#include "gdefn.h"


short _WCI86FAR _CGRAPH _getpixel( short x, short y )
/*==============================================

   This function queries the color of the pixel at ( x, y ). */

{
    short           colour;

    if( _GrProlog() ) {
        colour = _L1GetDot( _VtoPhysX( x ), _VtoPhysY( y ) );
        _GrEpilog();
    } else {
        colour = -1;
    }
    return( colour );
}

Entry( _GETPIXEL, _getpixel ) // alternate entry-point


short _WCI86FAR _CGRAPH _setpixel( short x, short y )
/*==============================================

   This routine sets the pixel at the point ( x, y ), in viewport coords.   */

{
    short           old_colour;

    if( _GrProlog() ) {
        old_colour = _L1PutDot( _VtoPhysX( x ), _VtoPhysY( y ) );
        _GrEpilog();
    } else {
        old_colour = -1;
    }
    return( old_colour );
}

Entry( _SETPIXEL, _setpixel ) // alternate entry-point