Paper/patches/server/0975-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 03b07f36b32ad8239f82a9536a4c1b08ed12e9ca..e3085b4d106d5985078ab3820dd12bdb58ab5889 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -2358,6 +2358,7 @@ public class ServerLevel extends Level implements ServerEntityGetter, WorldGenLe
                             {
                                 if ( iter.next().player == entity )
                                 {
+                                    map.decorations.remove(entity.getName().getString()); // Paper
                                     iter.remove();
                                 }
                             }
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index 52b18f2c333b7535929bb4e52e65cf5fb0f5692f..b0cec2132c21abac64420e0d9a23b5346dfd9ee4 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -2811,6 +2811,14 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player {
                 this.awardStat(Stats.DROP);
             }
 
+            // Paper start - remove player from map on drop
+            if (itemstack.getItem() == Items.FILLED_MAP) {
+                net.minecraft.world.level.saveddata.maps.MapItemSavedData worldmap = net.minecraft.world.item.MapItem.getSavedData(itemstack, this.level());
+                if (worldmap != null) {
+                    worldmap.tickCarriedBy(this, itemstack);
+                    }
+                }
+            // 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 2d5e7380e8a14cbc01ba48cd05deccc0c7f53430..ae321b3b8d98e42ef07fd1f0f738c1a2b428f6db 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
@@ -80,6 +80,7 @@ public class MapItemSavedData extends SavedData {
     public final Map<String, MapDecoration> decorations = Maps.newLinkedHashMap();
     private final Map<String, MapFrame> frameMarkers = Maps.newHashMap();
     private int trackedDecorationCount;
+    private org.bukkit.craftbukkit.map.RenderData vanillaRender = new org.bukkit.craftbukkit.map.RenderData(); // Paper
 
     // CraftBukkit start
     public final CraftMapView mapView;
@@ -105,6 +106,7 @@ public class MapItemSavedData extends SavedData {
         // CraftBukkit start
         this.mapView = new CraftMapView(this);
         this.server = (CraftServer) org.bukkit.Bukkit.getServer();
+        this.vanillaRender.buffer = colors; // Paper
         // CraftBukkit end
     }
 
@@ -179,6 +181,7 @@ public class MapItemSavedData extends SavedData {
         if (abyte.length == 16384) {
             worldmap.colors = abyte;
         }
+        worldmap.vanillaRender.buffer = abyte; // Paper
 
         RegistryOps<Tag> registryops = registries.createSerializationContext(NbtOps.INSTANCE);
         List<MapBanner> list = (List) MapBanner.LIST_CODEC.parse(registryops, nbt.get("banners")).resultOrPartial((s) -> {
@@ -367,7 +370,7 @@ public class MapItemSavedData extends SavedData {
             --this.trackedDecorationCount;
         }
 
-        this.setDecorationsDirty();
+        if (mapicon != null) this.setDecorationsDirty(); // Paper - only mark dirty if a change occurs
     }
 
     public static void addTargetDecoration(ItemStack stack, BlockPos pos, String id, Holder<MapDecorationType> decorationType) {
@@ -621,6 +624,21 @@ 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) this.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;
@@ -654,7 +672,9 @@ public class MapItemSavedData extends SavedData {
         @Nullable
         Packet<?> nextUpdatePacket(MapId mapId) {
             MapItemSavedData.MapPatch worldmap_c;
-            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
 
             if (this.dirtyData) {
                 this.dirtyData = false;
@@ -670,6 +690,8 @@ public class MapItemSavedData extends SavedData {
                 // CraftBukkit start
                 java.util.Collection<MapDecoration> icons = new java.util.ArrayList<MapDecoration>();
 
+                if (vanillaMaps) addSeenPlayers(icons); // Paper
+
                 for (org.bukkit.map.MapCursor cursor : render.cursors) {
                     if (cursor.isVisible()) {
                         icons.add(new MapDecoration(CraftMapCursor.CraftType.bukkitToMinecraftHolder(cursor.getType()), cursor.getX(), cursor.getY(), cursor.getDirection(), Optional.ofNullable(PaperAdventure.asVanilla(cursor.caption()))));
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() {