Take width of hanging signs into account

core/src/main/java/org/geysermc/geyser/level/block/BlockStateValues.java

@@ -45,6 +45,7 @@ import java.util.Locale;
  */
 public final class BlockStateValues {
     private static final IntSet ALL_CAULDRONS = new IntOpenHashSet();
+    private static final IntSet HANGING_SIGNS = new IntOpenHashSet();
     private static final Int2IntMap BANNER_COLORS = new FixedInt2IntMap();
     private static final Int2ByteMap BED_COLORS = new FixedInt2ByteMap();
     private static final Int2ByteMap COMMAND_BLOCK_VALUES = new Int2ByteOpenHashMap();
@@ -86,6 +87,12 @@ public final class BlockStateValues {
      * @param blockData      JsonNode of info about the block from blocks.json
      */
     public static void storeBlockStateValues(String javaId, int javaBlockState, JsonNode blockData) {
+        if (javaId.contains("_hanging_sign")) {
+            // covers hanging_sign and wall_hanging_sign
+            HANGING_SIGNS.add(javaBlockState);
+            return;
+        }
+
         JsonNode bannerColor = blockData.get("banner_color");
         if (bannerColor != null) {
             BANNER_COLORS.put(javaBlockState, (byte) bannerColor.intValue());
@@ -203,6 +210,17 @@ public final class BlockStateValues {
         }
     }
 
+    /**
+     * Hanging signs have a different maximum text width than "normal" signs. As a result, when the client
+     * updates the text of a sign without indication of the sign type, we must determine it.
+     *
+     * @param state BlockState of the block
+     * @return true if the sign is any hanging variant
+     */
+    public static boolean isHangingSign(int state) {
+        return HANGING_SIGNS.contains(state);
+    }
+
     /**
      * Banner colors are part of the namespaced ID in Java Edition, but part of the block entity tag in Bedrock.
      * This gives an integer color that Bedrock can use.

core/src/main/java/org/geysermc/geyser/translator/level/block/entity/HangingSignBlockEntityTranslator.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2019-2023 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Geyser
+ */
+
+package org.geysermc.geyser.translator.level.block.entity;
+
+import com.github.steveice10.mc.protocol.data.game.level.block.BlockEntityType;
+import org.geysermc.geyser.util.SignUtils;
+
+@BlockEntity(type = BlockEntityType.HANGING_SIGN)
+public class HangingSignBlockEntityTranslator extends SignBlockEntityTranslator {
+
+    @Override
+    public int signWidthMax() {
+        return SignUtils.HANGING_SIGN_WIDTH_MAX; // Smaller than that for BlockEntityType.SIGN
+    }
+}

core/src/main/java/org/geysermc/geyser/translator/level/block/entity/SignBlockEntityTranslator.java

@@ -35,7 +35,7 @@ import org.geysermc.geyser.text.ChatColor;
 import org.geysermc.geyser.translator.text.MessageTranslator;
 import org.geysermc.geyser.util.SignUtils;
 
-@BlockEntity(type = {BlockEntityType.SIGN, BlockEntityType.HANGING_SIGN})
+@BlockEntity(type = BlockEntityType.SIGN)
 public class SignBlockEntityTranslator extends BlockEntityTranslator {
     /**
      * Maps a color stored in a sign's Color tag to its ARGB value.
@@ -67,6 +67,10 @@ public class SignBlockEntityTranslator extends BlockEntityTranslator {
         return dyeColor | (255 << 24);
     }
 
+    public int signWidthMax() {
+        return SignUtils.SIGN_WIDTH_MAX;
+    }
+
     @Override
     public void translateTag(NbtMapBuilder builder, CompoundTag tag, int blockState) {
         builder.putCompound("FrontText", translateSide(tag.get("front_text")));
@@ -105,8 +109,7 @@ public class SignBlockEntityTranslator extends BlockEntityTranslator {
                         signWidth += SignUtils.getCharacterWidth(c);
                     }
 
-                    // todo 1.20: update for hanging signs (smaller width). Currently OK because bedrock sees hanging signs as normal signs
-                    if (signWidth <= SignUtils.BEDROCK_CHARACTER_WIDTH_MAX) {
+                    if (signWidth <= signWidthMax()) {
                         finalSignLine.append(c);
                     } else {
                         // Adding the character would make Bedrock move to the next line - Java doesn't do that, so we do not want to

core/src/main/java/org/geysermc/geyser/translator/protocol/bedrock/BedrockBlockEntityDataTranslator.java

@@ -44,6 +44,9 @@ public class BedrockBlockEntityDataTranslator extends PacketTranslator<BlockEnti
         NbtMap tag = packet.getData();
         String id = tag.getString("id");
         if (id.equals("Sign")) {
+            // Hanging signs are narrower
+            int widthMax = SignUtils.getSignWidthMax(session.getGeyser().getWorldManager().getBlockAt(session, packet.getBlockPosition()));
+
             String text = MessageTranslator.convertToPlainText(
                 tag.getCompound(session.getWorldCache().isEditingSignOnFront() ? "FrontText" : "BackText").getString("Text"));
             // Note: as of 1.18.30, only one packet is sent from Bedrock when the sign is finished.
@@ -60,13 +63,10 @@ public class BedrockBlockEntityDataTranslator extends PacketTranslator<BlockEnti
             for (char character : text.toCharArray()) {
                 widthCount += SignUtils.getCharacterWidth(character);
 
-                // todo 1.20: update for hanging signs (smaller width). Currently bedrock thinks hanging signs are normal,
-                // so it thinks hanging signs have more width than they actually do. Seems like JE just truncates it.
-
                 // If we get a return in Bedrock, or go over the character width max, that signals to use the next line.
-                if (character == '\n' || widthCount > SignUtils.JAVA_CHARACTER_WIDTH_MAX) {
+                if (character == '\n' || widthCount > widthMax) {
                     // We need to apply some more logic if we went over the character width max
-                    boolean wentOverMax = widthCount > SignUtils.JAVA_CHARACTER_WIDTH_MAX && character != '\n';
+                    boolean wentOverMax = widthCount > widthMax && character != '\n';
                     widthCount = 0;
                     // Saves if we're moving a word to the next line
                     String word = null;

core/src/main/java/org/geysermc/geyser/util/SignUtils.java

@@ -25,6 +25,8 @@
 
 package org.geysermc.geyser.util;
 
+import org.geysermc.geyser.level.block.BlockStateValues;
+
 /**
  * Provides utilities for interacting with signs. Mainly, it deals with the widths of each character.
  * Since Bedrock auto-wraps signs and Java does not, we have to take this into account when translating signs.
@@ -33,14 +35,15 @@ public class SignUtils {
 
     // TODO: If we send the Java font via resource pack, does width change?
     /**
-     * The maximum character width that a sign can hold in Bedrock
+     * The maximum character width that a non-hanging sign can hold in both Java and Bedrock
      */
-    public static final int BEDROCK_CHARACTER_WIDTH_MAX = 88;
+    public static final int SIGN_WIDTH_MAX = 90;
 
     /**
-     * The maximum character width that a sign can hold in Java
+     * The maximum character width that a hanging sign can hold in both Java and Bedrock. Hanging signs are narrower.
      */
-    public static final int JAVA_CHARACTER_WIDTH_MAX = 90;
+    public static final int HANGING_SIGN_WIDTH_MAX = 60;
+
 
     /**
      * Gets the Minecraft width of a character
@@ -58,4 +61,10 @@ public class SignUtils {
         };
     }
 
+    public static int getSignWidthMax(int javaBlockState) {
+        if (BlockStateValues.isHangingSign(javaBlockState)) {
+            return HANGING_SIGN_WIDTH_MAX;
+        }
+        return SIGN_WIDTH_MAX;
+    }
 }