linux下的framebuffer显示图片

void  showbmp2()
 {
     int x,y;
     unsigned char *p;
     int index=0;
     struct fb_var_screeninfo vinfo; 
     struct fb_fix_screeninfo finfo; 

     struct fb_bitfield red; 
     struct fb_bitfield green; 
     struct fb_bitfield blue; 

     //open the showdeviece
     fbfd = open("/dev/fb0", O_RDWR); 
     if (!fbfd) 
     { 
  printf("Error: cannot open framebuffer device.\n"); 
  e