cnvcolor.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 59 行

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*                            Open Watcom Project
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#include "gdefn.h"


long _VGA_Colours[ 16 ] = {     /* Maps VGA colours to EGA equivalents */
    _BLACK, _BLUE, _GREEN, _CYAN,
    _RED, _MAGENTA, _BROWN, _WHITE,
    _GRAY, _LIGHTBLUE, _LIGHTGREEN, _LIGHTCYAN,
    _LIGHTRED, _LIGHTMAGENTA, _LIGHTYELLOW, _BRIGHTWHITE
};


short _CnvColour( long colr )
/*===========================

   This routine converts a VGA colour to an equivalent EGA colour. */

{
    short                 i;                      /* loop counter */

    for( i = 0; i < 16; i++ ) {
        if( colr == _VGA_Colours[ i ] ) {       /* if its a standard one */
            return( i );                        /* use the index */
        }
    }
    return( colr & 0x000f );                    /* otherwise, just use */
}                                               /* colour mod 16 */