func: void qemu_pixman_linebuf_fill(pixman_image_t *linebuf, pixman_image_t *fb,
  
                                int width, int y)
  
  {
  
      pixman_image_composite(PIXMAN_OP_SRC, fb, NULL, linebuf,
  
                             0, y, 0, 0, 0, 0, width, 1);
  
  }
  