Codechange: Make void tiles flood edge tiles, instead of edge tiles flooding themselves (#8517)

src/clear_cmd.cpp

@@ -13,7 +13,6 @@
 #include "landscape.h"
 #include "genworld.h"
 #include "viewport_func.h"
-#include "water.h"
 #include "core/random_func.hpp"
 #include "newgrf_generic.h"
 #include "landscape_cmd.h"
@@ -248,15 +247,6 @@ static void TileLoopClearDesert(TileIndex tile)
 
 static void TileLoop_Clear(TileIndex tile)
 {
-	/* If the tile is at any edge flood it to prevent maps without water. */
-	if (_settings_game.construction.freeform_edges && DistanceFromEdge(tile) == 1) {
-		int z;
-		if (IsTileFlat(tile, &z) && z == 0) {
-			DoFloodTile(tile);
-			MarkTileDirtyByTile(tile);
-			return;
-		}
-	}
 	AmbientSoundEffect(tile);
 
 	switch (_settings_game.game_creation.landscape) {

src/void_cmd.cpp

@@ -12,6 +12,7 @@
 #include "command_func.h"
 #include "viewport_func.h"
 #include "slope_func.h"
+#include "water.h"
 
 #include "table/strings.h"
 #include "table/sprites.h"
@@ -53,7 +54,8 @@ static void GetTileDesc_Void(TileIndex tile, TileDesc *td)
 
 static void TileLoop_Void(TileIndex tile)
 {
-	/* not used */
+	/* Floods adjacent edge tile to prevent maps without water. */
+	TileLoop_Water(tile);
 }
 
 static void ChangeTileOwner_Void(TileIndex tile, Owner old_owner, Owner new_owner)

src/water_cmd.cpp

@@ -1089,6 +1089,9 @@ FloodingBehaviour GetFloodingBehaviour(TileIndex tile)
 		case MP_TREES:
 			return (GetTreeGround(tile) == TREE_GROUND_SHORE ? FLOOD_DRYUP : FLOOD_NONE);
 
+		case MP_VOID:
+			return FLOOD_ACTIVE;
+
 		default:
 			return FLOOD_NONE;
 	}
@@ -1240,7 +1243,7 @@ void TileLoop_Water(TileIndex tile)
 			Slope slope_here = GetFoundationSlope(tile) & ~SLOPE_HALFTILE_MASK & ~SLOPE_STEEP;
 			for (uint dir : SetBitIterator(_flood_from_dirs[slope_here])) {
 				TileIndex dest = tile + TileOffsByDir((Direction)dir);
-				if (!IsValidTile(dest)) continue;
+				if (dest >= Map::Size()) continue;
 
 				FloodingBehaviour dest_behaviour = GetFloodingBehaviour(dest);
 				if ((dest_behaviour == FLOOD_ACTIVE) || (dest_behaviour == FLOOD_PASSIVE)) return;
@@ -1279,7 +1282,7 @@ void ConvertGroundTilesIntoWaterTiles()
 					for (uint dir : SetBitIterator(_flood_from_dirs[slope & ~SLOPE_STEEP])) {
 						TileIndex dest = TileAddByDir(tile, (Direction)dir);
 						Slope slope_dest = GetTileSlope(dest) & ~SLOPE_STEEP;
-						if (slope_dest == SLOPE_FLAT || IsSlopeWithOneCornerRaised(slope_dest)) {
+						if (slope_dest == SLOPE_FLAT || IsSlopeWithOneCornerRaised(slope_dest) || IsTileType(dest, MP_VOID)) {
 							MakeShore(tile);
 							break;
 						}