PaperMC/Spigot-Server-Patches/0127-Improve-Maps-in-item-frames-performance-and-bug-fixe.patch

From 30b393ec80969343be6ee7461d490f38f1c1cad9 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 29 Apr 2016 20:02:00 -0400
Subject: [PATCH] Improve Maps (in item frames) performance and bug fixes

Maps used a modified version of rendering to support plugin controlled
imaging on maps. The Craft Map Renderer is much slower than Vanilla,
causing maps in item frames to cause a noticeable hit on server performance.

This updates the map system to not use the Craft system if we detect that no
custom renderers are in use, defaulting to the much simpler Vanilla system.

Additionally, numerous issues to player position tracking on maps has been fixed.

diff --git a/src/main/java/net/minecraft/server/EntityHuman.java b/src/main/java/net/minecraft/server/EntityHuman.java
index 43e28d6..af173a1 100644
--- a/src/main/java/net/minecraft/server/EntityHuman.java
+++ b/src/main/java/net/minecraft/server/EntityHuman.java
@@ -597,6 +597,12 @@ public abstract class EntityHuman extends EntityLiving {
                 return null;
             }
             // CraftBukkit end
+            // Paper start - remove player from map on drop
+            if (itemstack.getItem() == Items.FILLED_MAP) {
+                WorldMap worldmap = Items.FILLED_MAP.getSavedMap(itemstack, this.world);
+                worldmap.updateSeenPlayers(this, itemstack);
+            }
+            // Paper stop
 
             ItemStack itemstack1 = this.a(entityitem);
 
diff --git a/src/main/java/net/minecraft/server/EntityTrackerEntry.java b/src/main/java/net/minecraft/server/EntityTrackerEntry.java
index f542bf4..fbda70a 100644
--- a/src/main/java/net/minecraft/server/EntityTrackerEntry.java
+++ b/src/main/java/net/minecraft/server/EntityTrackerEntry.java
@@ -90,11 +90,11 @@ public class EntityTrackerEntry {
         }
 
         // PAIL : rename
-        if (this.tracker instanceof EntityItemFrame /*&& this.a % 10 == 0*/) { // CraftBukkit - Moved below, should always enter this block
+        if (this.tracker instanceof EntityItemFrame && this.a % 20 == 0) { // Paper
             EntityItemFrame entityitemframe = (EntityItemFrame) this.tracker;
             ItemStack itemstack = entityitemframe.getItem();
 
-            if (this.a % 10 == 0 && itemstack.getItem() instanceof ItemWorldMap) { // CraftBukkit - Moved this.a % 10 logic here so item frames do not enter the other blocks
+            if (itemstack != null && itemstack.getItem() instanceof ItemWorldMap) { // Paper - moved back up
                 WorldMap worldmap = Items.FILLED_MAP.getSavedMap(itemstack, this.tracker.world);
                 Iterator iterator = this.trackedPlayers.iterator(); // CraftBukkit
 
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 2a23e29..651ab32 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1217,6 +1217,7 @@ public abstract class World implements IBlockAccess {
                     {
                         if ( iter.next().trackee == entity )
                         {
+                            map.decorations.remove(entity.getUniqueID()); // Paper
                             iter.remove();
                         }
                     }
diff --git a/src/main/java/net/minecraft/server/WorldMap.java b/src/main/java/net/minecraft/server/WorldMap.java
index dd5412e..dbe6a80 100644
--- a/src/main/java/net/minecraft/server/WorldMap.java
+++ b/src/main/java/net/minecraft/server/WorldMap.java
@@ -28,6 +28,7 @@ public class WorldMap extends PersistentBase {
     public List<WorldMap.WorldMapHumanTracker> i = Lists.newArrayList();
     public final Map<EntityHuman, WorldMap.WorldMapHumanTracker> k = Maps.newHashMap(); // Spigot private -> public
     public Map<UUID, MapIcon> decorations = Maps.newLinkedHashMap(); // Spigot
+    private org.bukkit.craftbukkit.map.RenderData vanillaRender = new org.bukkit.craftbukkit.map.RenderData(); // Paper
 
     // CraftBukkit start
     public final CraftMapView mapView;
@@ -40,6 +41,7 @@ public class WorldMap extends PersistentBase {
         // CraftBukkit start
         mapView = new CraftMapView(this);
         server = (CraftServer) org.bukkit.Bukkit.getServer();
+        vanillaRender.buffer = colors; // Paper
         // CraftBukkit end
     }
 
@@ -114,6 +116,7 @@ public class WorldMap extends PersistentBase {
                 }
             }
         }
+        vanillaRender.buffer = colors; // Paper
 
     }
 
@@ -149,6 +152,7 @@ public class WorldMap extends PersistentBase {
         return nbttagcompound;
     }
 
+    public void updateSeenPlayers(EntityHuman entityhuman, ItemStack itemstack) { a(entityhuman, itemstack); } // Paper - OBFHELPER
     public void a(EntityHuman entityhuman, ItemStack itemstack) {
         if (!this.k.containsKey(entityhuman)) {
             WorldMap.WorldMapHumanTracker worldmap_worldmaphumantracker = new WorldMap.WorldMapHumanTracker(entityhuman);
@@ -314,6 +318,21 @@ public class WorldMap extends PersistentBase {
 
     public class WorldMapHumanTracker {
 
+        // Paper start
+        private void addSeenPlayers(java.util.Collection<MapIcon> icons) {
+            org.bukkit.entity.Player player = (org.bukkit.entity.Player) trackee.getBukkitEntity();
+            WorldMap.this.decorations.forEach((uuid, mapIcon) -> {
+                // If this cursor is for a player check visibility with vanish system
+                org.bukkit.entity.Player other = org.bukkit.Bukkit.getPlayer(uuid); // Spigot
+                if (other == null || player.canSee(other)) {
+                    icons.add(mapIcon);
+                }
+            });
+        }
+        private boolean shouldUseVanillaMap() {
+            return mapView.getRenderers().size() == 1 && mapView.getRenderers().get(0).getClass() == org.bukkit.craftbukkit.map.CraftMapRenderer.class;
+        }
+        // Paper stop
         public final EntityHuman trackee;
         private boolean d = true;
         private int e;
@@ -330,9 +349,12 @@ public class WorldMap extends PersistentBase {
         @Nullable
         public Packet<?> a(ItemStack itemstack) {
             // CraftBukkit start
-            org.bukkit.craftbukkit.map.RenderData render = WorldMap.this.mapView.render((org.bukkit.craftbukkit.entity.CraftPlayer) this.trackee.getBukkitEntity()); // CraftBukkit
+            if (!this.d && this.i % 5 != 0) { this.i++; return null; } // Paper - this won't end up sending, so don't render it!
+            boolean vanillaMaps = shouldUseVanillaMap(); // Paper
+            org.bukkit.craftbukkit.map.RenderData render = !vanillaMaps ? WorldMap.this.mapView.render((org.bukkit.craftbukkit.entity.CraftPlayer) this.trackee.getBukkitEntity()) : WorldMap.this.vanillaRender; // CraftBukkit // Paper
 
             java.util.Collection<MapIcon> icons = new java.util.ArrayList<MapIcon>();
+            if (vanillaMaps) addSeenPlayers(icons); // Paper
 
             for ( org.bukkit.map.MapCursor cursor : render.cursors) {
 
diff --git a/src/main/java/org/bukkit/craftbukkit/map/RenderData.java b/src/main/java/org/bukkit/craftbukkit/map/RenderData.java
index 256a131..5768cd5 100644
--- a/src/main/java/org/bukkit/craftbukkit/map/RenderData.java
+++ b/src/main/java/org/bukkit/craftbukkit/map/RenderData.java
@@ -5,7 +5,7 @@ import org.bukkit.map.MapCursor;
 
 public class RenderData {
 
-    public final byte[] buffer;
+    public byte[] buffer; // Paper
     public final ArrayList<MapCursor> cursors;
 
     public RenderData() {
-- 
2.9.3