From 6387a4ad1c7e96f16dc8e84eadeb9179f814c6ec Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Tue, 11 Jun 2013 12:17:37 +1000
Subject: [PATCH] More Efficient GetCubes


diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 2c5c6b0..a09de8e 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1104,28 +1104,56 @@ public abstract class World implements IBlockAccess {
         IBlockData iblockdata = Blocks.STONE.getBlockData();
         BlockPosition.MutableBlockPosition blockposition_mutableblockposition = new BlockPosition.MutableBlockPosition();
 
-        for (int k1 = i; k1 < j; ++k1) {
-            for (int l1 = i1; l1 < j1; ++l1) {
-                if (this.isLoaded(blockposition_mutableblockposition.c(k1, 64, l1))) {
-                    for (int i2 = k - 1; i2 < l; ++i2) {
-                        blockposition_mutableblockposition.c(k1, i2, l1);
-                        if (flag && flag1) {
-                            entity.h(false);
-                        } else if (!flag && !flag1) {
-                            entity.h(true);
-                        }
-
-                        IBlockData iblockdata1 = iblockdata;
+        // Spigot start
+        int ystart = ( ( k - 1 ) < 0 ) ? 0 : ( k - 1 );
+        for ( int chunkx = ( i >> 4 ); chunkx <= ( ( j - 1 ) >> 4 ); chunkx++ )
+        {
+            int cx = chunkx << 4;
+            for ( int chunkz = ( i1 >> 4 ); chunkz <= ( ( j1 - 1 ) >> 4 ); chunkz++ )
+            {
+                if ( !this.isChunkLoaded( chunkx, chunkz, true ) )
+                {
+                    continue;
+                }
+                int cz = chunkz << 4;
+                Chunk chunk = this.getChunkAt( chunkx, chunkz );
+                // Compute ranges within chunk
+                int xstart = ( i < cx ) ? cx : i;
+                int xend = ( j < ( cx + 16 ) ) ? j : ( cx + 16 );
+                int zstart = ( i1 < cz ) ? cz : i1;
+                int zend = ( j1 < ( cz + 16 ) ) ? j1 : ( cz + 16 );
+                // Loop through blocks within chunk
+                for ( int x = xstart; x < xend; x++ )
+                {
+                    for ( int z = zstart; z < zend; z++ )
+                    {
+                        for ( int y = ystart; y < l; y++ )
+                        {
+                            BlockPosition blockposition = new BlockPosition( x, y, z );
+
+                            if (flag && flag1) {
+                                entity.h(false);
+                            } else if (!flag && !flag1) {
+                                entity.h(true);
+                            }
 
-                        if (worldborder.a((BlockPosition) blockposition_mutableblockposition) || !flag1) {
-                            iblockdata1 = this.getType(blockposition_mutableblockposition);
+                            IBlockData block; 
+                            if (!this.getWorldBorder().a(blockposition) && flag1) {
+                                block = Blocks.STONE.getBlockData();
+                            } else 
+                            {
+                                block = chunk.getBlockData( blockposition );
+                            }
+                            if ( block != null )
+                            {
+                                block.getBlock().a(this, blockposition, block, axisalignedbb, arraylist, entity);
+                            }
                         }
-
-                        iblockdata1.getBlock().a(this, blockposition_mutableblockposition, iblockdata1, axisalignedbb, arraylist, entity);
                     }
                 }
             }
         }
+        // Spigot end
 
         double d0 = 0.25D;
         List list = this.getEntities(entity, axisalignedbb.grow(d0, d0, d0));
-- 
2.1.4