142 lines
3.3 KiB
C#
142 lines
3.3 KiB
C#
using CustomResolution.WndProcHookManagerProxyApi;
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using Serilog.Events;
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using System;
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using System.Linq;
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using System.Reflection.Emit;
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using TerraFX.Interop.Windows;
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namespace CustomResolution.Hooks;
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// THIS. IS. UGLY.
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public sealed class WndProcHook : IDisposable
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{
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private const uint WM_MOUSEFIRST = 0x0200;
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private const uint WM_MOUSELAST = 0x0209;
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private static WndProcHook? _instance;
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private readonly WndProcHookManager _manager;
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private bool _applied = false;
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private DynamicMethod? _genMethod;
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private Delegate? _genDelegate;
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public WndProcHook()
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{
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_instance = this;
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_manager = new();
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Apply();
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}
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public void Dispose()
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{
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if (!_applied)
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{
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return;
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}
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if (_manager.PreWndProc is not { } preWndProcProp)
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{
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Service.PluginLog.Information("CustomResolution couldn't obtain the PreWndProc event.");
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return;
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}
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preWndProcProp.RemoveEventHandler(_manager.ProxiedValue, _genDelegate);
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_applied = false;
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}
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public static void InvokeStatic(object args)
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{
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if (_instance is { } instance)
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{
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instance.Invoke(new WndProcEventArgs(instance._manager, args));
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}
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}
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private static void ParamToCoords(LPARAM param, out int x, out int y)
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{
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x = (short) (ushort) (param.Value & 0xFFFF);
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y = (short) (ushort) (param.Value >> 16 & 0xFFFF);
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}
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private static LPARAM CoordsToParam(int x, int y)
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{
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nint value = 0;
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value |= ((ushort) (short) x) & 0xFFFF;
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value |= ((ushort) (short) y) >> 16 & 0xFFFF;
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return value;
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}
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private void Invoke(WndProcEventArgs args)
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{
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if (!(WM_MOUSEFIRST <= args.Message && args.Message <= WM_MOUSELAST))
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{
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return;
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}
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ParamToCoords(args.LParam, out int x, out int y);
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#if false
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Service.PluginLog.Debug($"WM_MOUSE A @ {x} {y}");
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#endif
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Service.Plugin.ConvertCoordsWinToGame(ref x, ref y);
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#if false
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Service.PluginLog.Debug($"WM_MOUSE B @ {x} {y}");
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#endif
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args.LParam = CoordsToParam(x, y);
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}
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private void Apply()
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{
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if (!_manager.Refresh())
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{
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return;
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}
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if (_applied)
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{
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Dispose();
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}
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if (_manager.PreWndProc is not { } preWndProcProp)
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{
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Service.PluginLog.Information("CustomResolution couldn't obtain the PreWndProc event.");
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return;
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}
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if (_genDelegate is null)
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{
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var delegateType = preWndProcProp.EventHandlerType!;
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var delegateInvoke = delegateType.GetMethod("Invoke")!;
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_genMethod = new DynamicMethod(
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"CustomResolution_PreWndProc",
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delegateInvoke.ReturnType,
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delegateInvoke.GetParameters().Select(p => p.ParameterType).ToArray()
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);
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var il = _genMethod.GetILGenerator();
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il.Emit(OpCodes.Ldarg_0);
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il.Emit(OpCodes.Call, typeof(WndProcHook).GetMethod("InvokeStatic")!);
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il.Emit(OpCodes.Ret);
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_genDelegate = _genMethod.CreateDelegate(delegateType);
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}
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preWndProcProp.AddEventHandler(_manager.ProxiedValue, _genDelegate);
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_applied = true;
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}
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}
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