Something

 unsigned int *im_data, *im_data2, *start, *finish; 
 int ew, eh, nw, nh, i, j;

 ewl_object_current_size_get(EWL_OBJECT(image_view), &ew, &eh);
 im_data = evas_object_image_data_get(EWL_IMAGE(image_view)->image, TRUE);

 im_data2 = malloc((unsigned int) * ew * eh);
 
 start = im_data;

 nw = eh;
 eh = ew;
 ew = nw;
 nh = nw * eh;
 
 end = im_data2 + nh - nw;
 nw = -nw;
 nh = nh - 1;

 start = im_data;

 for (i = ew; --i >= 0;)
 {
  for (j = eh; --j >= 0;)
  {
   *end = *start;
   start++;
   end += nw;
  }
  end += nh;
 }

 evas_object_image_size_get(EWL_IMAGE(image_view)->image, ew, eh);
 evas_object_image_data_set(EWL_IMAGE(image_view)->image, im_data2);
 evas_object_image_data_update_add(EWL_IMAGE(image_view)->image, 0, 0, ew, eh);
}