Mine

void rotate_left(Ewl_Widget *w, void *event, void *data)
{
 unsigned int *im_data, *im_data_new;
 int index, ind, i, j, ni, nj, ew, eh;

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

 im_data = malloc(sizeof(unsigned int) * ew * eh);
 index = 0;

 for (i = 0; i < eh; i++)
 {
  for (j = 0; j < ew; j++)
  {
   ni = j;
   nj = eh - i - 1;

   ind = ni * ew + nj;
   im_data_new[index] = im_data[ind];
   index++;
  }
 }

 evas_object_image_size_set(EWL_IMAGE(image_view)->image, ew, eh);
 evas_object_image_data_set(EWL_IMAGE(image_view)->image, im_data_new);
 evas_object_image_data_update_add(EWL_IMAGE(image_view)->image, 0, 0, ew, eh);
}