Method SetOverlayCargoMask

src/smallmap_gui.cpp:1255–1262

* Set the link graph overlay cargo mask from the legend. */

	 * Set the link graph overlay cargo mask from the legend.
	 */
	void SetOverlayCargoMask()
	{
		CargoTypes cargo_mask = 0;
		for (int i = 0; i != _smallmap_cargo_count; ++i) {
			if (_legend_linkstats[i].show_on_map) SetBit(cargo_mask, _legend_linkstats[i].type);
		}
		this->overlay->SetCargoMask(cargo_mask);
	}

	/**
	 * Function to set up widgets depending on the information being shown on the smallmap.