bbt422.c

linux嵌入式开发程序

/*===========================================================================
        2D Graphics Library
        ALL RIGHTS RESERVED, COPYRIGHT (C) FUJITSU LIMITED 1993-2002
        LICENSED MATERIAL - PROGRAM PROPERTY OF FUJITSU LIMITED
 ===========================================================================*/
#include <stdio.h>
#include "gl.h"
#include "defhook.h"

#define BitLen  16
#define BitSft  4

#define TileMask    (TileLen-1)
#define TileBpl     64


int
_GL_bbtileYUV422(GL_WP *gp)
{
    int     sbitp,dbitp,words,lines, tj ;
    BYTE    *dadr, *tilep ;
#ifndef xNo00010008
    long    sbase  = ( ( gp->bitblt.dx - (gp->bitblt.bx&~1) ) & TileMask) * (BitLen>>3) ;
#endif

    dadr  = _AddAdr(gp->hwork.VRAMadr[gp->hwork.page][0],gp->bitblt.doffs) ;
    dbitp = 0 ;
    AdjAccAdr32(dadr,dbitp) ;
    tj    =  ( gp->bitblt.dy - gp->bitblt.by ) & TileMask ;
    words = ((gp->bitblt.tx<<BitSft) + dbitp)>>5 ;
    lines = gp->bitblt.ty ;

    while(lines-->0){
        register DWORD  *dst ;
        register DWORD  d, o ;
        register int    tx ;
        register long   soffs ;
#ifdef xNo00010008
        soffs  = ( ( gp->bitblt.dx - gp->bitblt.bx ) & TileMask) * (BitLen>>3) ;
#else
        soffs  = sbase ;
#endif
        sbitp  = 0 ;
        AdjAccOffs32(soffs, sbitp) ;

        tilep  = (BYTE *)gp->bitblt.tilep + tj * TileBpl ;
        tx     = gp->bitblt.tx ;
        dst    = (DWORD *)dadr ;

        if(words>0){
            if(dbitp>0){
                d = *(DWORD *)(tilep+soffs) ;
                o = *dst ;
                soffs += 4 ;
                if(soffs>=TileBpl)
                    soffs = 0 ;
                *dst++ = ( d & 0x0000ff00 )
                       | ( o & 0xff000000 )
                       | ( ( ( (d&0x00ff00ff)+(o&0x00ff00ff) )>>1)& 0x00ff00ff ) ;
                tx-- ;
            }
            while(tx>=2){
                *dst++ = *(DWORD *)(tilep+soffs) ;
                soffs += 4 ;
                if(soffs>=TileBpl)
                    soffs = 0 ;
                tx -= 2 ;
            }
        }
        if(tx>0){
            d = *(DWORD *)(tilep+soffs) ;
            o = *dst ;
            *dst =   ( d & 0xff000000 )
                   | ( o & 0x0000ff00 )
                   | ( ( ( (d&0x00ff00ff)+(o&0x00ff00ff) )>>1)& 0x00ff00ff ) ;
        }
        tj = (tj+1) & TileMask ;
        dadr = _AddAdr(dadr,gp->bitblt.dlbytes) ;
    }
    return GL_Ok ;
}