Function lv_image_decoder_post_process 

pub unsafe extern "C" fn lv_image_decoder_post_process(
    dsc: *mut lv_image_decoder_dsc_t,
    decoded: *mut lv_draw_buf_t,
) -> *mut lv_draw_buf_t

Check the decoded image, make any modification if decoder args requires. @note A new draw buf will be allocated if provided decoded is not modifiable or stride mismatch etc. @param dsc pointer to a decoder descriptor @param decoded pointer to a decoded image to post process to meet dsc->args requirement. @return post processed draw buffer, when it differs with decoded, it’s newly allocated.