From cd533b26359642bdec95a3361c014ad35ae5b14b Mon Sep 17 00:00:00 2001
From: jhqwqmc <jhcraft@qq.com>
Date: Tue, 28 Oct 2025 10:37:26 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96visual=5Fblock=5Fstate?=
 =?UTF-8?q?=E7=9A=84=E7=BC=96=E8=A7=A3=E7=A0=81=E5=99=A8=E4=BB=A5=E8=8A=82?=
 =?UTF-8?q?=E7=BA=A6=E5=B8=A6=E5=AE=BD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../protocol/VisualBlockStatePacket.java      | 67 ++++++++++++++++++-
 1 file changed, 65 insertions(+), 2 deletions(-)

diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/VisualBlockStatePacket.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/VisualBlockStatePacket.java
index 42a626a9e..bed116f3e 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/VisualBlockStatePacket.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/VisualBlockStatePacket.java
@@ -1,5 +1,6 @@
 package net.momirealms.craftengine.bukkit.plugin.network.payload.protocol;
 
+import io.netty.handler.codec.DecoderException;
 import net.momirealms.craftengine.bukkit.block.BukkitBlockManager;
 import net.momirealms.craftengine.bukkit.util.BlockStateUtils;
 import net.momirealms.craftengine.core.block.ImmutableBlockState;
@@ -19,13 +20,75 @@ public record VisualBlockStatePacket(int[] data) implements ModPacket {
             VisualBlockStatePacket::encode,
             VisualBlockStatePacket::new
     );
+    private static final int RLE_THRESHOLD = 3;
+    private static final int RLE_TAG = 0;
+    private static final int DELTA_TAG = 1;
 
     private VisualBlockStatePacket(FriendlyByteBuf buf) {
-        this(buf.readVarIntArray());
+        this(decode(buf));
     }
 
     private void encode(FriendlyByteBuf buf) {
-        buf.writeVarIntArray(this.data);
+        encode(buf, this.data);
+    }
+
+    private static void encode(FriendlyByteBuf buf, int[] data) {
+        if (data.length == 0) {
+            buf.writeVarInt(0);
+            return;
+        }
+        buf.writeVarInt(data.length);
+        int i = 0;
+        int previousValue = 0;
+        while (i < data.length) {
+            int currentValue = data[i];
+            int repeatCount = 1;
+            int j = i + 1;
+            while (j < data.length && data[j] == currentValue) {
+                repeatCount++;
+                j++;
+            }
+            if (repeatCount >= RLE_THRESHOLD) {
+                buf.writeVarInt(RLE_TAG);
+                buf.writeVarInt(currentValue);
+                buf.writeVarInt(repeatCount);
+                i += repeatCount;
+                previousValue = currentValue;
+            } else {
+                buf.writeVarInt(DELTA_TAG);
+                int delta = currentValue - previousValue;
+                buf.writeVarInt(delta);
+                previousValue = currentValue;
+                i++;
+            }
+        }
+    }
+
+    private static int[] decode(FriendlyByteBuf buf) {
+        int length = buf.readVarInt();
+        if (length == 0) return new int[0];
+        int[] data = new int[length];
+        int previousValue = 0;
+        int i = 0;
+        while (i < length) {
+            int tag = buf.readVarInt();
+            if (tag == RLE_TAG) {
+                int value = buf.readVarInt();
+                int count = buf.readVarInt();
+                if (i + count > length) throw new DecoderException("RLE count exceeds array bounds");
+                for (int j = 0; j < count; j++) data[i++] = value;
+                previousValue = value;
+            } else if (tag == DELTA_TAG) {
+                int delta = buf.readVarInt();
+                int currentValue = previousValue + delta;
+                data[i++] = currentValue;
+                previousValue = currentValue;
+            } else {
+                throw new DecoderException("Unknown encoding tag: " + tag);
+            }
+        }
+        if (i != length) throw new DecoderException("Decoded length mismatch");
+        return data;
     }
 
     @Override