Swap between cloaking and window opacity.c

#define _WIN32_WINNT 0x0602
#include <windows.h>
#include <dwmapi.h>
#define printf __builtin_printf
HWND windowHandle = NULL;
BOOL windowCloak = FALSE;

LRESULT WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    static UINT shellHookMessage = 0;
    if (uMsg == WM_CREATE)
    {
        shellHookMessage = RegisterWindowMessageW(L"SHELLHOOK");
        RegisterShellHookWindow(hWnd);
        SendNotifyMessageW(hWnd, shellHookMessage, GetShellWindow() ? 0x35 : 0x36, 0);
        ShowWindow(hWnd, SW_SHOW);
    }
    else if (uMsg == WM_NCACTIVATE)
    {
        wParam = hWnd == GetForegroundWindow();
        if (GetShellWindow())
            DwmSetWindowAttribute(hWnd, DWMWA_CLOAK, &((BOOL){!wParam}), sizeof(BOOL));
        else
            SetLayeredWindowAttributes(hWnd, 0, wParam ? 255 : 0, LWA_ALPHA);
    }
    else if (uMsg == WM_STYLECHANGING && wParam == GWL_EXSTYLE)
        ((LPSTYLESTRUCT)lParam)->styleNew = GetShellWindow() ? 0 : WS_EX_LAYERED;
    else if (uMsg == shellHookMessage && (wParam == 0x35 || wParam == 0x36))
    {
        HWND shellWindowHandle = GetShellWindow();
        BOOL isForegroundWindow = hWnd == GetForegroundWindow();
        SetWindowLongPtrW(hWnd, GWL_EXSTYLE, 0);
        DwmSetWindowAttribute(hWnd, DWMWA_CLOAK, &((BOOL){shellWindowHandle ? !isForegroundWindow : FALSE}), sizeof(BOOL));
        SetLayeredWindowAttributes(hWnd, 0, shellWindowHandle ? 255 : (isForegroundWindow ? 255 : 0), LWA_ALPHA);
    }

    return DefWindowProcW(hWnd, uMsg, wParam, lParam);
}

INT WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, INT nShowCmd)
{
    MSG msg = {};

    if (!RegisterClassW(&((WNDCLASSW){.lpszClassName = L" ", .lpfnWndProc = WndProc, .hbrBackground = GetStockObject(BLACK_BRUSH)})) ||
        !CreateWindowExW(WS_EX_LAYERED, L" ", NULL, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL))
        return EXIT_FAILURE;
    while (GetMessageW(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessageW(&msg);
    }
    return EXIT_SUCCESS;
}