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Make the mod work

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This commit is contained in:
Michael Mikovsky
2025-09-07 16:01:15 -06:00
parent 38a069a4b0
commit b585e11062
8 changed files with 371 additions and 52 deletions
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src/main/java/com/example/ExampleMod.java
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package com.example;
import net.fabricmc.api.ModInitializer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ExampleMod implements ModInitializer {
public static final String MOD_ID = "modid";
// This logger is used to write text to the console and the log file.
// It is considered best practice to use your mod id as the logger's name.
// That way, it's clear which mod wrote info, warnings, and errors.
public static final Logger LOGGER = LoggerFactory.getLogger(MOD_ID);
@Override
public void onInitialize() {
// This code runs as soon as Minecraft is in a mod-load-ready state.
// However, some things (like resources) may still be uninitialized.
// Proceed with mild caution.
LOGGER.info("Hello Fabric world!");
}
}
src/main/java/com/example/mixin/ExampleMixin.java
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package com.example.mixin;
import net.minecraft.server.MinecraftServer;
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.callback.CallbackInfo;
@Mixin(MinecraftServer.class)
public class ExampleMixin {
@Inject(at = @At("HEAD"), method = "loadWorld")
private void init(CallbackInfo info) {
// This code is injected into the start of MinecraftServer.loadWorld()V
}
}
src/main/java/dev/astatin3/favicon/ExampleMod.java
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package dev.astatin3.favicon;
import com.mojang.brigadier.arguments.StringArgumentType;
import net.fabricmc.api.ModInitializer;
import net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback;
import net.minecraft.command.argument.TextArgumentType;
import net.minecraft.component.DataComponentTypes;
import net.minecraft.component.type.MapIdComponent;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.item.map.MapState;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.ServerMetadata;
import net.minecraft.server.command.CommandManager;
import net.minecraft.server.network.ServerPlayerEntity;
import net.minecraft.text.Text;
import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.file.Path;
import java.util.Objects;
import java.util.Optional;
import static net.minecraft.server.command.CommandManager.literal;
public class ExampleMod implements ModInitializer {
public static final String MOD_ID = "favicon";
// This logger is used to write text to the console and the log file.
// It is considered best practice to use your mod id as the logger's name.
// That way, it's clear which mod wrote info, warnings, and errors.
public static final Logger LOGGER = LoggerFactory.getLogger(MOD_ID);
@Override
public void onInitialize() {
// This code runs as soon as Minecraft is in a mod-load-ready state.
// However, some things (like resources) may still be uninitialized.
// Proceed with mild caution.
// LOGGER.info("Hello Fabric world!");
CommandRegistrationCallback.EVENT.register((dispatcher, registryAccess, environment) -> dispatcher.register(literal("favicon")
.executes(context -> {
// For versions below 1.19, replace "Text.literal" with "new LiteralText".
// For versions below 1.20, remode "() ->" directly.
ServerPlayerEntity player = context.getSource().getPlayer();
ItemStack mainHandStack = player.getMainHandStack();
if(mainHandStack == null) {
context.getSource().sendFeedback(() -> Text.literal("Error getting held item"), false);
return 1;
}
Item item = mainHandStack.getItem();
if(!Objects.equals(item.toString(), "minecraft:filled_map")) {
context.getSource().sendFeedback(() -> Text.literal("Invalid held item. You must be holding a Filled Map"), false);
return 1;
}
MapIdComponent mapIdComponent = mainHandStack.get(DataComponentTypes.MAP_ID);
MapState mapState = player.getWorld().getMapState(mapIdComponent);
if(mapState == null) {
context.getSource().sendFeedback(() -> Text.literal("Error getting map data"), false);
return 1;
}
MinecraftServer server = player.getServer();
ServerMetadata metadata = server.getServerMetadata();
if(metadata == null) {
context.getSource().sendFeedback(() -> Text.literal("Error getting server metadata"), false);
return 1;
}
context.getSource().sendFeedback(() -> Text.literal("Encoding icon data..."), false);
// for (int y = 0; y < 64; y++) {
// String text = "";
// for (int x = 0; x < 64; x++) {
// text += mapState.colors[y * 128 + x] + ", ";
// }
// String finalText = text;
// context.getSource().sendFeedback(() -> Text.literal(finalText), false);
// }
BufferedImage bufImg = convertImage(mapState.colors);
byte[] favicon = toBytes(bufImg);
if(favicon == null) {
context.getSource().sendFeedback(() -> Text.literal("Error encoding icon"), false);
return 1;
}
context.getSource().sendFeedback(() -> Text.literal("Setting current server icon..."), false);
ServerMetadata newMetadata = new ServerMetadata(
metadata.description(),
metadata.players(),
metadata.version(),
Optional.of(new ServerMetadata.Favicon(favicon)),
metadata.secureChatEnforced()
);
((MetadataAccessor) server).setServerMetadata(newMetadata);
context.getSource().sendFeedback(() -> Text.literal("Saving new icon file..."), false);
Path iconpath = server.getPath("server-icon.png");
try {
FileUtils.writeByteArrayToFile(iconpath.toFile(), favicon);
} catch (IOException e) {
throw new RuntimeException(e);
}
context.getSource().sendFeedback(() -> Text.literal("Done!"), false);
context.getSource().sendFeedback(() -> Text.literal("Current icon: " + server.getServerMetadata().favicon().get().iconBytes().length + " bytes"), false);
return 1;
})));
// CommandRegistrationCallback.EVENT.register((dispatcher, registryAccess, environment) -> dispatcher.register(literal("motd")
// .then(CommandManager.argument("MOTD", StringArgumentType.greedyString())
// .executes(context -> {
//
// ServerPlayerEntity player = context.getSource().getPlayer();
// MinecraftServer server = player.getServer();
// ServerMetadata metadata = server.getServerMetadata();
//
// if(metadata == null) {
// context.getSource().sendFeedback(() -> Text.literal("Error getting server metadata"), false);
// return 1;
// }
//
// context.getSource().sendFeedback(() -> Text.literal("Setting server metadata..."), false);
// context.getSource().sendFeedback(() -> Text.literal("Preview:"), false);
//
// String motdText = StringArgumentType.getString(context, "MOTD");
// Text motd = Text.of(motdText);
//
// context.getSource().sendFeedback(() -> motd, false);
//
// ServerMetadata newMetadata = new ServerMetadata(
// motd,
// metadata.players(),
// metadata.version(),
// metadata.favicon(),
// metadata.secureChatEnforced()
// );
//
// ((MetadataAccessor) server).setServerMetadata(newMetadata);
//
//
// return 1;
// }))));
}
private BufferedImage convertImage(byte[] mapBytes) {
if (mapBytes.length != 16384) {
throw new IllegalArgumentException("Image data must be exactly 16384 bytes (128x128)");
}
// Create cropped image data (64x64 = 4096 bytes)
// byte[] croppedData = new byte[64 * 64];
BufferedImage bufferedImage = new BufferedImage(64, 64, BufferedImage.TYPE_INT_RGB);
// Copy top-left 64x64 quadrant
for (int y = 0; y < 64; y++) {
for (int x = 0; x < 64; x++) {
bufferedImage.setRGB(x, y, mapByteToColor(mapBytes[y * 128 + x]));
}
}
return bufferedImage;
}
private byte[] toBytes(BufferedImage bufferedImage) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
ImageIO.write(bufferedImage, "PNG", baos);
} catch (Exception e) {
return null;
}
return baos.toByteArray();
}
// https://minecraft.wiki/w/Map_item_format
private static final int[][] BASE_COLORS = {
{0, 0, 0}, // 0: None/Transparent
{127, 178, 56}, // 1: Grass
{247, 233, 163}, // 2: Sand
{199, 199, 199}, // 3: Wool
{255, 0, 0}, // 4: Fire
{160, 160, 255}, // 5: Ice
{167, 167, 167}, // 6: Metal
{0, 124, 0}, // 7: Plant
{255, 255, 255}, // 8: Snow
{164, 168, 184}, // 9: Clay
{151, 109, 77}, // 10: Dirt
{112, 112, 112}, // 11: Stone
{64, 64, 255}, // 12: Water
{143, 119, 72}, // 13: Wood
{255, 252, 245}, // 14: Quartz
{216, 127, 51}, // 15: Color Orange
{178, 76, 216}, // 16: Color Magenta
{102, 153, 216}, // 17: Color Light Blue
{229, 229, 51}, // 18: Color Yellow
{127, 204, 25}, // 19: Color Light Green
{242, 127, 165}, // 20: Color Pink
{76, 76, 76}, // 21: Color Gray
{153, 153, 153}, // 22: Color Light Gray
{76, 127, 153}, // 23: Color Cyan
{127, 63, 178}, // 24: Color Purple
{51, 76, 178}, // 25: Color Blue
{102, 76, 51}, // 26: Color Brown
{102, 127, 51}, // 27: Color Green
{153, 51, 51}, // 28: Color Red
{25, 25, 25}, // 29: Color Black
{250, 238, 77}, // 30: Gold
{92, 219, 213}, // 31: Diamond
{74, 128, 255}, // 32: Lapis
{0, 217, 58}, // 33: Emerald
{129, 86, 49}, // 34: Podzol
{112, 2, 0}, // 35: Nether
{209, 177, 161}, // 36: Terracotta White
{159, 82, 36}, // 37: Terracotta Orange
{149, 87, 108}, // 38: Terracotta Magenta
{112, 108, 138}, // 39: Terracotta Light Blue
{186, 133, 36}, // 40: Terracotta Yellow
{103, 117, 53}, // 41: Terracotta Light Green
{160, 77, 78}, // 42: Terracotta Pink
{57, 41, 35}, // 43: Terracotta Gray
{135, 107, 98}, // 44: Terracotta Light Gray
{87, 92, 92}, // 45: Terracotta Cyan
{122, 73, 88}, // 46: Terracotta Purple
{76, 62, 92}, // 47: Terracotta Blue
{76, 50, 35}, // 48: Terracotta Brown
{76, 82, 42}, // 49: Terracotta Green
{142, 60, 46}, // 50: Terracotta Red
{37, 22, 16}, // 51: Terracotta Black
{189, 48, 49}, // 52: Crimson Nylium
{148, 63, 97}, // 53: Crimson Stem
{92, 25, 29}, // 54: Crimson Hyphae
{22, 126, 134}, // 55: Warped Nylium
{58, 142, 140}, // 56: Warped Stem
{86, 44, 62}, // 57: Warped Hyphae
{20, 180, 133}, // 58: Warped Wart Block
{100, 100, 100}, // 59: Deepslate
{216, 175, 147}, // 60: Raw Iron
{127, 167, 150} // 61: Glow Lichen
};
// Brightness multipliers for each shade level
private static final double[] BRIGHTNESS_MULTIPLIERS = {
180.0 / 255.0, // 0: Darkest
220.0 / 255.0, // 1: Dark
255.0 / 255.0, // 2: Normal (brightest)
135.0 / 255.0 // 3: Very dark
};
public static int mapByteToColor(byte mapByte) {
int unsignedByte = mapByte & 0xFF;
// Color ID 0 is transparent
if (unsignedByte == 0) {
return 0;
}
// Decode base color and brightness level
int baseColorIndex = (unsignedByte - 1) / 4;
int brightnessLevel = (unsignedByte - 1) % 4;
// Validate base color index
if (baseColorIndex < 0 || baseColorIndex >= BASE_COLORS.length) {
return 0; // Return transparent for invalid colors
}
// Get base color RGB values
int[] baseRgb = BASE_COLORS[baseColorIndex];
double multiplier = BRIGHTNESS_MULTIPLIERS[brightnessLevel];
// Apply brightness multiplier
int r = (int) Math.round(baseRgb[0] * multiplier);
int g = (int) Math.round(baseRgb[1] * multiplier);
int b = (int) Math.round(baseRgb[2] * multiplier);
// Clamp values to 0-255 range
r = Math.max(0, Math.min(255, r));
g = Math.max(0, Math.min(255, g));
b = Math.max(0, Math.min(255, b));
// Combine into single RGB integer
return (r << 16) | (g << 8) | b;
}
// public static int convertRgbByteToInt(byte rgbByte) {
// // Convert byte to unsigned int (0-255 range)
// int unsignedByte = rgbByte & 0xFF;
//
// // Extract the color components using bit masks and shifts
// int r = (unsignedByte >> 5) & 0x07; // Get top 3 bits (RRR)
// int g = (unsignedByte >> 2) & 0x07; // Get middle 3 bits (GGG)
// int b = unsignedByte & 0x03; // Get bottom 2 bits (BB)
//
// // Scale the values to full 8-bit range (0-255)
// // 3 bits (0-7) -> 8 bits (0-255): multiply by 255/7 ≈ 36.43
// // 2 bits (0-3) -> 8 bits (0-255): multiply by 255/3 = 85
// r = (r * 255) / 7; // Scale 3-bit to 8-bit
// g = (g * 255) / 7; // Scale 3-bit to 8-bit
// b = (b * 255) / 3; // Scale 2-bit to 8-bit
//
// // Combine into ARGB format: 0xAARRGGBB
// // Alpha = 255 (0xFF), fully opaque
// int argb = (255 << 24) | (r << 16) | (g << 8) | b;
//
// return argb;
// }
}
src/main/java/dev/astatin3/favicon/MetadataAccessor.java
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package dev.astatin3.favicon;
import net.minecraft.server.ServerMetadata;
import org.jetbrains.annotations.Nullable;
import java.util.Optional;
public interface MetadataAccessor {
default void setServerMetadata(ServerMetadata metadata) {}
}
src/main/java/dev/astatin3/favicon/mixin/ExampleMixin.java
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package dev.astatin3.favicon.mixin;
import dev.astatin3.favicon.MetadataAccessor;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.ServerMetadata;
import org.jetbrains.annotations.Nullable;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.Shadow;
import java.util.Optional;
@Mixin(MinecraftServer.class)
public class ExampleMixin implements MetadataAccessor {
@Shadow @Nullable private ServerMetadata metadata;
@Shadow @Nullable private ServerMetadata.Favicon favicon;
@Override
public void setServerMetadata(ServerMetadata metadata) {
this.metadata = metadata;
this.favicon = metadata.favicon().orElse(null);
}
}
src/main/resources/fabric.mod.json
+3 -10
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@@ -5,7 +5,7 @@
"name": "Example mod",
"description": "This is an example description! Tell everyone what your mod is about!",
"authors": [
"Me!"
"Astatin3"
],
"contact": {
"homepage": "https://fabricmc.net/",
@@ -16,18 +16,11 @@
"environment": "*",
"entrypoints": {
"main": [
"com.example.ExampleMod"
],
"client": [
"com.example.ExampleModClient"
"dev.astatin3.favicon.ExampleMod"
]
},
"mixins": [
"modid.mixins.json",
{
"config": "modid.client.mixins.json",
"environment": "client"
}
"modid.mixins.json"
],
"depends": {
"fabricloader": ">=0.16.14",
src/main/resources/modid.mixins.json
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@@ -1,9 +1,9 @@
{
"required": true,
"package": "com.example.mixin",
"package": "dev.astatin3.favicon.mixin",
"compatibilityLevel": "JAVA_21",
"mixins": [
"ExampleMixin"
"ExampleMixin"
],
"injectors": {
"defaultRequire": 1