Paper/patches/unapplied/server/0852-Cache-map-ids-on-item-frames.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Warrior <50800980+Warriorrrr@users.noreply.github.com>
Date: Mon, 7 Aug 2023 12:58:28 +0200
Subject: [PATCH] Cache map ids on item frames


diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
index f010be9605d7458add7e5693ff473fabf679c938..a2fbbbd7a66d4e7b1063638f8467e8887a417282 100644
--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
@@ -117,7 +117,7 @@ public class ServerEntity {
                 ItemStack itemstack = entityitemframe.getItem();
 
                 if (this.level.paperConfig().maps.itemFrameCursorUpdateInterval > 0 && this.tickCount % this.level.paperConfig().maps.itemFrameCursorUpdateInterval == 0 && itemstack.getItem() instanceof MapItem) { // CraftBukkit - Moved this.tickCounter % 10 logic here so item frames do not enter the other blocks // Paper - Make item frame map cursor update interval configurable
-                    MapId mapid = (MapId) itemstack.get(DataComponents.MAP_ID);
+                    MapId mapid = entityitemframe.cachedMapId; // Paper - Perf: Cache map ids on item frames
                     MapItemSavedData worldmap = MapItem.getSavedData(mapid, this.level);
 
                     if (worldmap != null) {
diff --git a/src/main/java/net/minecraft/world/entity/decoration/ItemFrame.java b/src/main/java/net/minecraft/world/entity/decoration/ItemFrame.java
index ba4e0ad7c7c2731d61ec7f60f19d7e9ec31a28ba..5b7245cd99593ee90e17c97e0104f3aba9ae05ea 100644
--- a/src/main/java/net/minecraft/world/entity/decoration/ItemFrame.java
+++ b/src/main/java/net/minecraft/world/entity/decoration/ItemFrame.java
@@ -50,6 +50,7 @@ public class ItemFrame extends HangingEntity {
     private static final float HEIGHT = 0.75F;
     public float dropChance;
     public boolean fixed;
+    public @Nullable MapId cachedMapId; // Paper - Perf: Cache map ids on item frames
 
     public ItemFrame(EntityType<? extends ItemFrame> type, Level world) {
         super(type, world);
@@ -322,6 +323,7 @@ public class ItemFrame extends HangingEntity {
     }
 
     private void onItemChanged(ItemStack stack) {
+        this.cachedMapId = stack.getComponents().get(net.minecraft.core.component.DataComponents.MAP_ID); // Paper - Perf: Cache map ids on item frames
         if (!stack.isEmpty() && stack.getFrame() != this) {
             stack.setEntityRepresentation(this);
         }