Todo: Emoji chat renderer

Author: emyfops

common/src/main/java/com/lambda/mixin/render/ChatScreenMixin.java

@@ -1,14 +1,44 @@
 package com.lambda.mixin.render;
 
 import com.lambda.command.CommandManager;
+import com.lambda.graphics.renderer.gui.font.FontRenderer;
+import com.lambda.graphics.renderer.gui.font.LambdaEmoji;
+import com.lambda.graphics.renderer.gui.font.glyph.GlyphInfo;
+import kotlin.Pair;
+import kotlin.ranges.IntRange;
 import net.minecraft.client.gui.screen.ChatScreen;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.ModifyArg;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 
+import java.util.Collections;
+import java.util.List;
+
 @Mixin(ChatScreen.class)
 public abstract class ChatScreenMixin {
+    @ModifyArg(method = "sendMessage", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/network/ClientPlayNetworkHandler;sendChatMessage(Ljava/lang/String;)V"), index = 0)
+    private String modifyChatText(String chatText) {
+        List<Pair<GlyphInfo, IntRange>> emojis = FontRenderer.Companion.parseEmojis(chatText, LambdaEmoji.Twemoji);
+        Collections.reverse(emojis);
+
+        for (Pair<GlyphInfo, IntRange> emoji : emojis) {
+            String emojiString = chatText.substring(emoji.getSecond().getStart() + 1, emoji.getSecond().getEndInclusive());
+            if (LambdaEmoji.Twemoji.get(emojiString) == null)
+                continue;
+
+            // Because the width of a char is bigger than an emoji
+            // we can simply replace the matches string by a space
+            // and render it after the text
+            chatText = chatText.substring(0, emoji.getSecond().getStart()) + " " + chatText.substring(emoji.getSecond().getEndInclusive() + 1);
+
+            // TODO: Build a renderer for the emojis
+            // TODO: Render the emojis at their correct position
+        }
+
+        return chatText;
+    }
 
     @Inject(method = "sendMessage", at = @At("HEAD"), cancellable = true)
     void sendMessageInject(String chatText, boolean addToHistory, CallbackInfoReturnable<Boolean> cir) {

common/src/main/kotlin/com/lambda/graphics/renderer/gui/font/FontRenderer.kt

@@ -19,22 +19,6 @@ class FontRenderer(
     private val vao = VAO(VertexMode.TRIANGLES, VertexAttrib.Group.FONT)
 
     private val scaleMultiplier = 1.0
-    private val emojiRegex = Regex(":[a-zA-Z0-9_]+:")
-
-    /**
-     * Parses the emojis in the given text.
-     *
-     * @param text The text to parse.
-     * @return A list of pairs containing the glyph info and the range of the emoji in the text.
-     */
-    fun parseEmojis(text: String) =
-        mutableListOf<Pair<GlyphInfo, IntRange>>().apply {
-            emojiRegex.findAll(text).forEach { match ->
-                val emojiKey = match.value.substring(1, match.value.length - 1)
-                val charInfo = emojis[emojiKey] ?: return@forEach
-                add(charInfo to match.range)
-            }
-        }
 
     /**
      * Builds the vertex array for rendering the text.
@@ -101,7 +85,7 @@ class FontRenderer(
         var posX = 0.0
         val posY = getHeight(scale) * -0.5 + baselineOffset * actualScale
 
-        val emojis = parseEmojis(text)
+        val emojis = parseEmojis(text, emojis)
 
         fun draw(info: GlyphInfo, color: Color, offset: Double = 0.0) {
             val scaledSize = info.size * actualScale
@@ -170,8 +154,25 @@ class FontRenderer(
     companion object {
         private val shader = Shader("renderer/font")
 
-        private val shadowShift get() = RenderSettings.shadowShift * 5.0
-        private val baselineOffset get() = RenderSettings.baselineOffset * 2.0f - 10f
-        private val gap get() = RenderSettings.gap * 0.5f - 0.8f
+        val shadowShift get() = RenderSettings.shadowShift * 5.0
+        val baselineOffset get() = RenderSettings.baselineOffset * 2.0f - 10f
+        val gap get() = RenderSettings.gap * 0.5f - 0.8f
+
+        private val emojiRegex = Regex(":[a-zA-Z0-9_]+:")
+
+        /**
+         * Parses the emojis in the given text.
+         *
+         * @param text The text to parse.
+         * @return A list of pairs containing the glyph info and the range of the emoji in the text.
+         */
+        fun parseEmojis(text: String, emojis: LambdaEmoji) =
+            mutableListOf<Pair<GlyphInfo, IntRange>>().apply {
+                emojiRegex.findAll(text).forEach { match ->
+                    val emojiKey = match.value.substring(1, match.value.length - 1)
+                    val charInfo = emojis[emojiKey] ?: return@forEach
+                    add(charInfo to match.range)
+                }
+            }
     }
 }

common/src/main/kotlin/com/lambda/graphics/renderer/gui/font/LambdaEmoji.kt

@@ -6,7 +6,7 @@ import com.lambda.graphics.renderer.gui.font.glyph.EmojiGlyphs
 enum class LambdaEmoji(private val zipUrl: String) {
     Twemoji("https://github.com/Edouard127/emoji-generator/releases/latest/download/emojis.zip");
 
-    lateinit var glyphs: EmojiGlyphs // TODO: Support multiple emoji pools
+    lateinit var glyphs: EmojiGlyphs
 
     operator fun get(emoji: String) = glyphs.getEmoji(emoji)