bbs888.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 "gl.h"
#include "defhook.h"


#define BitLen  24

int
_GL_bbsetRGB888(GL_WP *gp) 
{
    int     dbitp,words,lines, ii ;
    DWORD   dmask_head, dmask_tail, color[3];
    BYTE    *dadr ;
/*
    color rotation
    (1)RGBR,    dbitp=0
    (2)GBRG,    dbitp=16
    (3)BRGB,    dbitp=8
*/
    {
        DWORD c = gp->bitblt.color & 0x00ffffff ;
        color[0] = (c<< 8)|(c>>16) ;
        color[1] = (c<<16)|(c>>8) ;
        color[2] = (c<<24)|(c>>0) ;
    }

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

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

    AdjAccAdr32(dadr,dbitp) ;

    dmask_head = (DWORD)-1>>dbitp ;
    words      = (int)gp->bitblt.tx * BitLen + dbitp ;
    dmask_tail = ~((DWORD)-1L >> (words&31)) ;
    words    >>= 5 ;

    if(words==0){
        dmask_head &= dmask_tail ;
        dmask_tail = 0 ;
    } else
        words-- ;

    ii = 0 ;
    switch(dbitp){
    case 16:    ii = 1 ; break ;
    case 8:     ii = 2 ; break ;
    }

    while(lines--){

        register    DWORD   *dst ;
        register    int     i, n ;

        dst = (DWORD *)dadr ;

        i = ii ;
        *dst++ = *dst & ~dmask_head | color[i++] & dmask_head ;

        if(i==3)
            i = 0 ;
        n = words ;
        while(n--){
            *dst++ = color[i++] ;
            if(i==3)
                i = 0 ;
        }
        if(dmask_tail)
            *dst = *dst & ~dmask_tail | color[i] & dmask_tail ;

        dadr += gp->bitblt.dlbytes ;
    }
    return GL_Ok ;
}