arm linux framebuffer 显示bmp图片

yyxl

在arm上显示bmp图片时，图片显示不够完整，不知道是像素点的坐标不对，还是在使用framebuferr时出了问题？
关键代码如下：
while(!feof(fp))
{
  PIXEL pix;
  unsigned short int tmp;
  rc = fread( (char *)&pix, 1, sizeof(unsigned short int), fp );
  if (rc != sizeof(unsigned short int) )
  { break; }
//  location = line_x * bits_per_pixel / 8 + (ciHeight - line_y - 1) * xres * bits_per_pixel / 8;
//  location = line_x * bits_per_pixel / 8 + (line_y ) * yres * bits_per_pixel / 8;
//  location = line_x * bits_per_pixel / 8 + (line_y ) * yres* bits_per_pixel / 8;
  location = line_x * xres* bits_per_pixel / 8 + (line_y ) * bits_per_pixel / 8;
  tmp=pix.red<<11 | pix.green<<6 | pix.blue;
  *((unsigned short int*)(fbp + location)) = tmp;

/*
  line_y++;
   if (line_y == ciHeight )
   {
    line_y = 0;
    line_x++;

    if(line_x==ciWidth)
    {
     break;
    }
   }
*/
  line_x++;
  if (line_x == ciWidth)
  {
   line_x = 0;
   line_y++;

   if(line_y== ciHeight )
   {
    break;
   }
  }
}
其中fbp为framebuffer的指针