virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height);
virtual void get_output_size(unsigned *width, unsigned *height,
unsigned *virtual_width, unsigned *virtual_height) const;
virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height);
virtual void get_output_size(unsigned *width, unsigned *height,
unsigned *virtual_width, unsigned *virtual_height) const;