bbd888.c

来自「linux嵌入式开发程序」· C语言 代码 · 共 61 行

/*===========================================================================
        2D Graphics Library
        ALL RIGHTS RESERVED, COPYRIGHT (C) FUJITSU LIMITED 1993-2002
        LICENSED MATERIAL - PROGRAM PROPERTY OF FUJITSU LIMITED
 ===========================================================================*/

#include "gl.h"
#include "defhook.h"


int
_GL_bbdotRGB888(GL_WP *gp)
{
    int     sbitp,lines ;
    BYTE    *sadr, *dadr ;

    dadr  = (BYTE *)_AddAdr(gp->hwork.VRAMadr[gp->hwork.page][0],gp->bitblt.doffs) ;
    sadr  = (BYTE *)gp->bitblt.soffs ;
    sbitp = gp->bitblt.sbitp ;
    lines = gp->bitblt.ty ;

    while(lines--){
        register DWORD  *src ;
        register BYTE   *dst ;
        register DWORD  c0,c1,c2, dots ;
        register int    n, tx ;

        AdjAccAdr32(sadr,sbitp) ;
        c2    = gp->bitblt.color ;
        c0    = c2 >> 16 ;
        c1    = c2 >> 8 ;

        src   = (DWORD *)sadr ;
        dst   = (BYTE  *)dadr ;
        dots  = *src++ << sbitp ;
        n     = 32 - sbitp ;
        tx    = gp->bitblt.tx ;

        while(tx--){
            if(n==0){
                dots = *src++ ;
                n = 32 ;
            }
            if((long)dots<0){
                dst[0] = (BYTE)c0 ;
                dst[1] = (BYTE)c1 ;
                dst[2] = (BYTE)c2 ;
            }
            dots<<=1 ;
            n-- ;
            dst += 3 ;
        }

        sadr   = _AddAdr(sadr, gp->bitblt.slbytes) ;
        dadr   = _AddAdr(dadr, gp->bitblt.dlbytes) ;
    }
    return GL_Ok ;
}