MapIconConverter.java

package net.hypixel.resourcepack.impl;

import net.hypixel.resourcepack.Converter;
import net.hypixel.resourcepack.PackConverter;
import net.hypixel.resourcepack.Util;
import net.hypixel.resourcepack.pack.Pack;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;

public class MapIconConverter extends Converter {

    protected Map<Long, Long> mapping = new HashMap<>();

    public MapIconConverter(PackConverter packConverter) {
        super(packConverter);
        mapping.put(pack(0, 0), pack(0, 0));
        mapping.put(pack(8, 0), pack(8, 0));
        mapping.put(pack(16, 0), pack(16, 0));
        mapping.put(pack(24, 0), pack(24, 0));
        mapping.put(pack(0, 8), pack(32, 0));
        mapping.put(pack(8, 8), pack(40, 0));
        mapping.put(pack(16, 8), pack(48, 0));
        mapping.put(pack(24, 8), pack(56, 0));
        mapping.put(pack(0, 16), pack(64, 0));
        mapping.put(pack(8, 16), pack(72, 0));
    }

    @Override
    public void convert(Pack pack) throws IOException {
        Path imagePath = pack.getMinecraftPath()
                .resolve("textures")
                .resolve("map")
                .resolve("map_icons.png");
        if (Files.exists(imagePath)) {
            BufferedImage newImage = Util.readImageResource("/map_icons.png");
            if (newImage == null) {
                throw new NullPointerException();
            }
            Graphics2D g2d = (Graphics2D) newImage.getGraphics();
            BufferedImage image = ImageIO.read(Files.newInputStream(imagePath));
            int scale = image.getWidth() / 32;
            for (int x = 0; x <= 32 - 8; x += 8) {
                for (int y = 0; y <= 32 - 8; y += 8) {
                    Long mapped = mapping.get(pack(x, y));
                    if (mapped != null) {
                        int newX = (int) (mapped >> 32);
                        int newY = (int) (long) mapped;
                        System.out.println("      Mapping " + x + "," + y + " to " + newX + "," + newY);
                        g2d.drawImage(image.getSubimage(x * scale, y * scale, 8 * scale, 8 * scale), newX * scale, newY * scale, null);
                    }
                }
            }
            ImageIO.write(newImage, "png", imagePath.toFile());
        }
    }

    protected long pack(int x, int y) {
        return (((long) x) << 32) | (y & 0xffffffffL);
    }

}