(svn r12170) -Fix: do not draw trees along road and street lights under low bridges (spotted by _minime_)

src/road_cmd.cpp

@@ -1054,6 +1054,16 @@ static void DrawRoadBits(TileInfo* ti)
 	/* Return if full detail is disabled, or we are zoomed fully out. */
 	if (!HasBit(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom > ZOOM_LVL_DETAIL) return;
 
+	/* Do not draw details (street lights, trees) under low bridge */
+	if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && (roadside == ROADSIDE_TREES || roadside == ROADSIDE_STREET_LIGHTS)) {
+		uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
+		uint minz = GetTileMaxZ(ti->tile) + 2 * TILE_HEIGHT;
+
+		if (roadside == ROADSIDE_TREES) minz += TILE_HEIGHT;
+
+		if (height < minz) return;
+	}
+
 	/* Draw extra details. */
 	for (drts = _road_display_table[roadside][road]; drts->image != 0; drts++) {
 		DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);

src/tunnelbridge_cmd.cpp

@@ -663,10 +663,16 @@ static CommandCost DoClearBridge(TileIndex tile, uint32 flags)
 		/* read this value before actual removal of bridge */
 		bool rail = GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL;
 		Owner owner = GetTileOwner(tile);
+		uint height = GetBridgeHeight(tile);
 
 		DoClearSquare(tile);
 		DoClearSquare(endtile);
 		for (TileIndex c = tile + delta; c != endtile; c += delta) {
+			/* do not let trees appear from 'nowhere' after removing bridge */
+			if (IsNormalRoadTile(c) && GetRoadside(c) == ROADSIDE_TREES) {
+				uint minz = GetTileMaxZ(c) + 3 * TILE_HEIGHT;
+				if (height < minz) SetRoadside(c, ROADSIDE_PAVED);
+			}
 			ClearBridgeMiddle(c);
 			MarkTileDirtyByTile(c);
 		}