Method GetTileColours

src/smallmap_gui.cpp:1320–1394

* Decide which colours to show to the user for a group of tiles. * @param ta Tile area to investigate. * @return Colours to display. */

	 * @return Colours to display.
	 */
	uint32_t GetTileColours(const TileArea &ta) const
	{
		int importance = 0;
		TileIndex tile = INVALID_TILE; // Position of the most important tile.
		TileType et = MP_VOID;         // Effective tile type at that position.

		for (TileIndex ti : ta) {
			TileType ttype = GetTileType(ti);

			switch (ttype) {
				case MP_TUNNELBRIDGE: {
					TransportType tt = GetTunnelBridgeTransportType(ti);

					switch (tt) {
						case TRANSPORT_RAIL: ttype = MP_RAILWAY; break;
						case TRANSPORT_ROAD: ttype = MP_ROAD;    break;
						default:             ttype = MP_WATER;   break;
					}
					break;
				}

				case MP_INDUSTRY:
					/* Special handling of industries while in "Industries" smallmap view. */
					if (this->map_type == SMT_INDUSTRY) {
						/* If industry is allowed to be seen, use its colour on the map.
						 * This has the highest priority above any value in _tiletype_importance. */
						IndustryType type = Industry::GetByTile(ti)->type;
						if (_legend_from_industries[_industry_to_list_pos[type]].show_on_map) {
							if (type == _smallmap_industry_highlight) {
								if (_smallmap_industry_highlight_state) return MKCOLOUR_XXXX(PC_WHITE);
							} else {
								return GetIndustrySpec(type)->map_colour.p * 0x01010101;
							}
						}
						/* Otherwise make it disappear */
						ttype = IsTileOnWater(ti) ? MP_WATER : MP_CLEAR;
					}
					break;

				default:
					break;
			}

			if (_tiletype_importance[ttype] > importance) {
				importance = _tiletype_importance[ttype];
				tile = ti;
				et = ttype;
			}
		}

		switch (this->map_type) {
			case SMT_CONTOUR:
				return GetSmallMapContoursPixels(tile, et);

			case SMT_VEHICLES:
				return GetSmallMapVehiclesPixels(tile, et);

			case SMT_INDUSTRY: