bbs422.c

来自「linux嵌入式开发程序」· C语言 代码 · 共 77 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"

#define BitSft  4

/*
    EDGE_BLEND  ... Blend by background color on both edges.
 */

#define   EDGE_BLEND


int
_GL_bbsetYUV422(GL_WP *gp) 
{
    long    doffs ;
    int     dbitp,words,lines ;
    register    DWORD   color ;

    color = gp->bitblt.color ;
    doffs = gp->bitblt.doffs ;
    dbitp = gp->bitblt.dbitp ;
    lines = gp->bitblt.ty ;

    AdjAccOffs32(doffs,dbitp) ;
    words = ((gp->bitblt.tx<<BitSft) + dbitp)>>5 ;

    while(lines-->0){
        register DWORD  *dst ;
        register DWORD  o ;
        register int    tx ;

        tx   = gp->bitblt.tx ;
        dst  = _AddAdr(gp->hwork.VRAMadr[gp->hwork.page][0],doffs) ;

        if(words>0){
            if(dbitp>0){
#ifdef EDGE_BLEND
                o = *dst ;
                *dst =   ( color & 0x0000ff00 )
                       | ( o     & 0xff000000 )
                       | ( ( ( (color&0x00ff00ff)+(o&0x00ff00ff) )>>1)& 0x00ff00ff ) ;
#else
                *dst = color ;
#endif
                dst++ ;
                tx-- ;
            }
            while(tx>=2){
                *dst = color ;
                dst++ ;
                tx  -= 2 ;
            }
        }
        if(tx>0){
#ifdef EDGE_BLEND
            o = *dst ;
            *dst =   ( color & 0xff000000 )
                   | ( o     & 0x0000ff00 )
                   | ( ( ( (color&0x00ff00ff)+(o&0x00ff00ff) )>>1)& 0x00ff00ff ) ;
#else
            *dst = color ;
#endif
        }
        doffs += gp->bitblt.dlbytes ;
    }
    return GL_Ok ;
}