this->get_w() == that->get_w() && this->get_h() == that->get_h() &&
this->get_bytes_per_line() == that->get_bytes_per_line() )
return this->copy_from(that);
this->get_w() == that->get_w() && this->get_h() == that->get_h() &&
this->get_bytes_per_line() == that->get_bytes_per_line() )
return this->copy_from(that);