PaperMC/patches/server-remapped/0097-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/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index bb99d9fe5e274318d8480a6de2c45b0a57351f77..0a613f94d1c796267636e1a343aeee65a49ffed5 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1164,6 +1164,7 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
                         {
                             if ( iter.next().player == entity )
                             {
+                                map.decorations.remove(entity.getName().getString()); // Paper
                                 iter.remove();
                             }
                         }
diff --git a/src/main/java/net/minecraft/world/entity/player/Player.java b/src/main/java/net/minecraft/world/entity/player/Player.java
index 3b451e75a7f49ea6b543aee9f0a51c0be3c4dfba..c11d5aa115d10e3c12863cf9d42c60194d63b690 100644
--- a/src/main/java/net/minecraft/world/entity/player/Player.java
+++ b/src/main/java/net/minecraft/world/entity/player/Player.java
@@ -85,6 +85,7 @@ import net.minecraft.world.item.ElytraItem;
 import net.minecraft.world.item.ItemCooldowns;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.Items;
+import net.minecraft.world.item.MapItem;
 import net.minecraft.world.item.ProjectileWeaponItem;
 import net.minecraft.world.item.SwordItem;
 import net.minecraft.world.item.crafting.Recipe;
@@ -104,6 +105,7 @@ import net.minecraft.world.level.block.entity.SignBlockEntity;
 import net.minecraft.world.level.block.entity.StructureBlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.block.state.pattern.BlockInWorld;
+import net.minecraft.world.level.saveddata.maps.MapItemSavedData;
 import net.minecraft.world.phys.AABB;
 import net.minecraft.world.phys.Vec3;
 import net.minecraft.world.scores.PlayerTeam;
@@ -686,6 +688,12 @@ public abstract class Player extends LivingEntity {
                 return null;
             }
             // CraftBukkit end
+            // Paper start - remove player from map on drop
+            if (stack.getItem() == Items.FILLED_MAP) {
+                MapItemSavedData worldmap = MapItem.getOrCreateSavedData(stack, this.level);
+                worldmap.updateSeenPlayers(this, stack);
+            }
+            // Paper end
 
             return entityitem;
         }
diff --git a/src/main/java/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java b/src/main/java/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java
index d44505b3ee2a35422568e9bce0d868191e348fc0..7582c7cd4235d212a0cf66a4c59ce0cedaa360ad 100644
--- a/src/main/java/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java
+++ b/src/main/java/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java
@@ -57,6 +57,7 @@ public class MapItemSavedData extends SavedData {
     private final Map<String, MapBanner> bannerMarkers = Maps.newHashMap();
     public final Map<String, MapDecoration> decorations = Maps.newLinkedHashMap();
     private final Map<String, MapFrame> frameMarkers = Maps.newHashMap();
+    private org.bukkit.craftbukkit.map.RenderData vanillaRender = new org.bukkit.craftbukkit.map.RenderData(); // Paper
 
     // CraftBukkit start
     public final CraftMapView mapView;
@@ -69,6 +70,7 @@ public class MapItemSavedData extends SavedData {
         // CraftBukkit start
         mapView = new CraftMapView(this);
         server = (CraftServer) org.bukkit.Bukkit.getServer();
+        vanillaRender.buffer = colors; // Paper
         // CraftBukkit end
     }
 
@@ -136,6 +138,7 @@ public class MapItemSavedData extends SavedData {
             this.bannerMarkers.put(mapiconbanner.getId(), mapiconbanner);
             this.addDecoration(mapiconbanner.getDecoration(), (LevelAccessor) null, mapiconbanner.getId(), (double) mapiconbanner.getPos().getX(), (double) mapiconbanner.getPos().getZ(), 180.0D, mapiconbanner.getName());
         }
+        this.vanillaRender.buffer = colors; // Paper
 
         ListTag nbttaglist1 = tag.getList("frames", 10);
 
@@ -216,6 +219,7 @@ public class MapItemSavedData extends SavedData {
         this.setDirty();
     }
 
+    public void updateSeenPlayers(Player entityhuman, ItemStack itemstack) { this.tickCarriedBy(entityhuman, itemstack); } // Paper - OBFHELPER
     public void tickCarriedBy(Player player, ItemStack stack) {
         if (!this.carriedByPlayers.containsKey(player)) {
             MapItemSavedData.HoldingPlayer worldmap_worldmaphumantracker = new MapItemSavedData.HoldingPlayer(player);
@@ -451,6 +455,21 @@ public class MapItemSavedData extends SavedData {
 
     public class HoldingPlayer {
 
+        // Paper start
+        private void addSeenPlayers(java.util.Collection<MapDecoration> icons) {
+            org.bukkit.entity.Player player = (org.bukkit.entity.Player) player.getBukkitEntity();
+            MapItemSavedData.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 Player player;
         private boolean dirtyData = true;
         private int minDirtyX;
@@ -467,9 +486,12 @@ public class MapItemSavedData extends SavedData {
         @Nullable
         public Packet<?> nextUpdatePacket(ItemStack stack) {
             // CraftBukkit start
-            org.bukkit.craftbukkit.map.RenderData render = MapItemSavedData.this.mapView.render((org.bukkit.craftbukkit.entity.CraftPlayer) this.player.getBukkitEntity()); // CraftBukkit
+            if (!this.dirtyData && this.tick % 5 != 0) { this.tick++; 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 ? MapItemSavedData.this.mapView.render((org.bukkit.craftbukkit.entity.CraftPlayer) this.player.getBukkitEntity()) : MapItemSavedData.this.vanillaRender; // CraftBukkit // Paper
 
             java.util.Collection<MapDecoration> icons = new java.util.ArrayList<MapDecoration>();
+            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 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() {