papermc/Spigot-Server-Patches/0095-Improve-Maps-in-item-frames-performance-and-bug-fixe.patch

From 0000000000000000000000000000000000000000 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 683d98dea1b46931478ac7b55e49bc9d92d36f77..485b69140f72a22b3eae53be74bcad003dd92e8f 100644
--- a/src/main/java/net/minecraft/server/EntityHuman.java
+++ b/src/main/java/net/minecraft/server/EntityHuman.java
@@ -595,6 +595,12 @@ 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 = ItemWorldMap.getSavedMap(itemstack, this.world);
+                worldmap.updateSeenPlayers(this, itemstack);
+            }
+            // Paper end
 
             return entityitem;
         }
diff --git a/src/main/java/net/minecraft/server/WorldMap.java b/src/main/java/net/minecraft/server/WorldMap.java
index e6d97e7ffae3eadac586bad078123cd4aaa69916..225353e072033d1e5aaf5604b8db255d9a154dc8 100644
--- a/src/main/java/net/minecraft/server/WorldMap.java
+++ b/src/main/java/net/minecraft/server/WorldMap.java
@@ -36,6 +36,7 @@ public class WorldMap extends PersistentBase {
     private final Map<String, MapIconBanner> m = Maps.newHashMap();
     public final Map<String, MapIcon> decorations = Maps.newLinkedHashMap();
     private final Map<String, WorldMapFrame> n = Maps.newHashMap();
+    private org.bukkit.craftbukkit.map.RenderData vanillaRender = new org.bukkit.craftbukkit.map.RenderData(); // Paper
 
     // CraftBukkit start
     public final CraftMapView mapView;
@@ -48,6 +49,7 @@ public class WorldMap extends PersistentBase {
         // CraftBukkit start
         mapView = new CraftMapView(this);
         server = (CraftServer) org.bukkit.Bukkit.getServer();
+        vanillaRender.buffer = colors; // Paper
         // CraftBukkit end
     }
 
@@ -115,6 +117,7 @@ public class WorldMap extends PersistentBase {
             this.m.put(mapiconbanner.f(), mapiconbanner);
             this.a(mapiconbanner.c(), (GeneratorAccess) null, mapiconbanner.f(), (double) mapiconbanner.a().getX(), (double) mapiconbanner.a().getZ(), 180.0D, mapiconbanner.d());
         }
+        this.vanillaRender.buffer = colors; // Paper
 
         NBTTagList nbttaglist1 = nbttagcompound.getList("frames", 10);
 
@@ -195,6 +198,7 @@ public class WorldMap extends PersistentBase {
         this.b();
     }
 
+    public void updateSeenPlayers(EntityHuman entityhuman, ItemStack itemstack) { this.a(entityhuman, itemstack); } // Paper - OBFHELPER
     public void a(EntityHuman entityhuman, ItemStack itemstack) {
         if (!this.humans.containsKey(entityhuman)) {
             WorldMap.WorldMapHumanTracker worldmap_worldmaphumantracker = new WorldMap.WorldMapHumanTracker(entityhuman);
@@ -430,6 +434,21 @@ 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((name, mapIcon) -> {
+                // If this cursor is for a player check visibility with vanish system
+                org.bukkit.entity.Player other = org.bukkit.Bukkit.getPlayerExact(name); // 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 end
         public final EntityHuman trackee;
         private boolean d = true;
         private int e;
@@ -446,9 +465,12 @@ 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/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index e1484ee03f1f1c59f849f72cc563cab88acf8930..c8d553007cacdeb734c88983151d433ccfe3d36b 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -1050,6 +1050,7 @@ public class WorldServer extends World implements GeneratorAccessSeed {
                         {
                             if ( iter.next().trackee == entity )
                             {
+                                map.decorations.remove(entity.getDisplayName().getString()); // Paper
                                 iter.remove();
                             }
                         }
diff --git a/src/main/java/org/bukkit/craftbukkit/map/RenderData.java b/src/main/java/org/bukkit/craftbukkit/map/RenderData.java
index 256a131781721c86dd6cdbc329335964570cbe8c..5768cd512ec166f1e8d1f4a28792015347297c3f 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() {