From f0ed5217da8461370856ab85c01932026f4edd91 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 1aca7f6..04f5ed1 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1063,23 +1063,42 @@ public abstract class World implements IBlockAccess {
         int i1 = MathHelper.floor(axisalignedbb.c);
         int j1 = MathHelper.floor(axisalignedbb.f + 1.0D);
 
-        for (int k1 = i; k1 < j; ++k1) {
-            for (int l1 = i1; l1 < j1; ++l1) {
-                if (this.isLoaded(k1, 64, l1)) {
-                    for (int i2 = k - 1; i2 < l; ++i2) {
-                        Block block;
-
-                        if (k1 >= -30000000 && k1 < 30000000 && l1 >= -30000000 && l1 < 30000000) {
-                            block = this.getType(k1, i2, l1);
-                        } else {
-                            block = Blocks.STONE;
+        // 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 ) )
+                {
+                    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++ )
+                        {
+                            Block block = chunk.getType(x - cx, y, z - cz );
+                            if ( block != null )
+                            {
+                                block.a( this, x, y, z, axisalignedbb, this.M, entity );
+                            }
                         }
-
-                        block.a(this, k1, i2, l1, axisalignedbb, this.M, entity);
                     }
                 }
             }
         }
+        // Spigot end
 
         double d0 = 0.25D;
         List list = this.getEntities(entity, axisalignedbb.grow(d0, d0, d0));
-- 
1.8.3.2