From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 20 Dec 2016 15:15:11 -0500
Subject: [PATCH] Bound Treasure Maps to World Border

Make it so a Treasure Map does not target a structure outside of the
World Border, where players are not even able to reach.

This also would help the case where a players close to the border, and one
that is outside happens to be closer, but unreachable, yet another reachable
one is in border that would of been missed.

diff --git a/src/main/java/net/minecraft/world/level/border/WorldBorder.java b/src/main/java/net/minecraft/world/level/border/WorldBorder.java
index a3ba3a09378e3bd0517464130ad2c702b0b0165d..3442e33a1146318228c4727a2a5afde685f69bf7 100644
--- a/src/main/java/net/minecraft/world/level/border/WorldBorder.java
+++ b/src/main/java/net/minecraft/world/level/border/WorldBorder.java
@@ -46,6 +46,18 @@ public class WorldBorder {
         return this.isWithinBounds((double) chunkPos.getMinBlockX(), (double) chunkPos.getMinBlockZ()) && this.isWithinBounds((double) chunkPos.getMaxBlockX(), (double) chunkPos.getMaxBlockZ());
     }
 
+    // Paper start - Bound treasure maps to world border
+    private final BlockPos.MutableBlockPos mutPos = new BlockPos.MutableBlockPos();
+    public boolean isBlockInBounds(int chunkX, int chunkZ) {
+        this.mutPos.set(chunkX, 64, chunkZ);
+        return this.isWithinBounds(this.mutPos);
+    }
+    public boolean isChunkInBounds(int chunkX, int chunkZ) {
+        this.mutPos.set(((chunkX << 4) + 15), 64, (chunkZ << 4) + 15);
+        return this.isWithinBounds(this.mutPos);
+    }
+    // Paper end - Bound treasure maps to world border
+
     public boolean isWithinBounds(AABB box) {
         return this.isWithinBounds(box.minX, box.minZ, box.maxX - 9.999999747378752E-6D, box.maxZ - 9.999999747378752E-6D);
     }
diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java b/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
index a53fa9bebdd46939a710e46466ca9a350ecefb27..0a779632c9d11496fcfc147870fba2699d9cc274 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
@@ -222,6 +222,7 @@ public abstract class ChunkGenerator {
 
             while (iterator.hasNext()) {
                 ChunkPos chunkcoordintpair = (ChunkPos) iterator.next();
+                if (!world.paperConfig().environment.locateStructuresOutsideWorldBorder && !world.getWorldBorder().isChunkInBounds(chunkcoordintpair.x, chunkcoordintpair.z)) { continue; } // Paper - Bound treasure maps to world border
 
                 blockposition_mutableblockposition.set(SectionPos.sectionToBlockCoord(chunkcoordintpair.x, 8), 32, SectionPos.sectionToBlockCoord(chunkcoordintpair.z, 8));
                 double d1 = blockposition_mutableblockposition.distSqr(center);