From 4d0cd6ef93096ca05ab8cb768574839fc2223abc Mon Sep 17 00:00:00 2001
From: Iceee <andrew@opticgaming.tv>
Date: Wed, 15 Jul 2015 02:41:12 -0700
Subject: [PATCH] ChunkMap caching


diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index ab4de94..d528e91 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -50,6 +50,29 @@ public class Chunk {
     public long lightUpdateTime;
     // PaperSpigot end
 
+    // PaperSpigot start - ChunkMap caching
+    private final Object chunkMapLock = new Object();
+    private PacketPlayOutMapChunk.ChunkMap chunkMap;
+    private boolean chunkMapDirty = true;
+
+    public void setDirty() {
+        synchronized (chunkMapLock) {
+            chunkMapDirty = true;
+        }
+    }
+
+    public PacketPlayOutMapChunk.ChunkMap getChunkMap() {
+        synchronized (chunkMapLock) {
+            if (chunkMapDirty || chunkMap == null) {
+                chunkMapDirty = false;
+                chunkMap = PacketPlayOutMapChunk.a(this, true, !world.worldProvider.o(), '\uffff');
+            }
+
+            return chunkMap;
+        }
+    }
+    // PaperSpigot end
+
     // CraftBukkit start - Neighbor loaded cache for chunk lighting and entity ticking
     private int neighbors = 0x1 << 12;
 
@@ -507,6 +530,7 @@ public class Chunk {
     }
 
     public IBlockData a(BlockPosition blockposition, IBlockData iblockdata) {
+        setDirty(); // PaperSpigot
         int i = blockposition.getX() & 15;
         int j = blockposition.getY();
         int k = blockposition.getZ() & 15;
diff --git a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
index 58c0275..91ceb81 100644
--- a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
+++ b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
@@ -18,7 +18,7 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
         this.a = chunk.locX;
         this.b = chunk.locZ;
         this.d = flag;
-        this.c = a(chunk, flag, !chunk.getWorld().worldProvider.o(), i);
+        this.c = chunk.getChunkMap(); // PaperSpigot
         chunk.world.spigotConfig.antiXrayInstance.obfuscateSync(chunk.locX, chunk.locZ, c.b, c.a, chunk.world);
     }
 
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 99473d1..5bb6ac1 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -2505,6 +2505,7 @@ public abstract class World implements IBlockAccess {
                 }
             }
 
+            chunk.setDirty(); // PaperSpigot
             // PaperSpigot start - Asynchronous light updates
             if (chunk.world.paperSpigotConfig.useAsyncLighting) {
                 chunk.pendingLightUpdates.decrementAndGet();
-- 
1.9.5.msysgit.1