me.themallard.bitmmo.impl.plugin.applethook.AppletHook.java Source code

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Here is the source code for me.themallard.bitmmo.impl.plugin.applethook.AppletHook.java

Source

/* Copyright (C) 2015 maaatts
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>. */

package me.themallard.bitmmo.impl.plugin.applethook;

import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.VarInsnNode;

import me.themallard.bitmmo.api.util.Filter;
import me.themallard.bitmmo.impl.plugin.Plugin;
import me.themallard.bitmmo.impl.plugin.SimplePlugin;

@Plugin
public class AppletHook extends SimplePlugin implements Opcodes {
    public AppletHook() {
        super("AppletHook");

        addFilter(new Filter<ClassNode>() {
            public boolean accept(ClassNode cn) {
                return cn.name != null && cn.name.equals("pulpcore/platform/applet/CoreApplet");
            }
        });

        registerDependency(AppletHookManager.class);
        registerDependency(IAppletCallback.class);
    }

    private void addGraphicsHook(MethodNode mn, boolean update) {
        String method = update ? "update" : "paint";
        String desc = mn.desc;

        InsnList insns = new InsnList();

        insns.add(new VarInsnNode(ALOAD, 1));
        insns.add(new MethodInsnNode(INVOKESTATIC, "me/themallard/bitmmo/impl/plugin/applethook/AppletHookManager",
                method, desc, false));

        mn.instructions.insertBefore(mn.instructions.get(mn.instructions.size() - 1), insns);
    }

    @Override
    public void run(ClassNode cn) {
        addGraphicsHook(cn.getMethodByName("update"), true);
        addGraphicsHook(cn.getMethodByName("paint"), false);
    }
}