Method ThreadProc

Rtxpt/SampleCommon/SplashScreen.cpp:195–272

}

DWORD WINAPI SplashScreen::ThreadProc(void* param)
{
    State* st = (State*)param;
    auto& s = st->s;

    // Your app is PerMonitorV2. Make this UI thread PerMonitorV2 as well.
    auto oldCtx = SetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);

    CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);

    // Register window class (per-process; safe to call multiple times with same name)
    const wchar_t* kClassName = L"SplashScreenWindowClass_PMv2";

    WNDCLASSW wc = {};
    wc.lpfnWndProc = &SplashScreen::WndProc;
    wc.hInstance = s.hInstance;
    wc.lpszClassName = kClassName;
    wc.hCursor = LoadCursor(nullptr, IDC_ARROW);
    RegisterClassW(&wc);

    // Create window: borderless, no taskbar button, optionally topmost.
    HWND hwnd = CreateWindowExW(
        WS_EX_TOOLWINDOW | WS_EX_LAYERED,
        kClassName,
        L"",
        WS_POPUP,
        0, 0, 1, 1,
        nullptr, nullptr, s.hInstance,
        st);

    s.hwnd.store(hwnd, std::memory_order_release);

    // Load image
    std::vector<uint8_t> bgra;
    UINT w = 0;
    UINT h = 0;

    bool ok = LoadPngWic_BGRA32(s.pngPath.c_str(), bgra, w, h);
    if (ok)
    {
        // Premultiply for UpdateLayeredWindow (even if mostly opaque, this is fine).
        PremultiplyIfNeeded(bgra);

        ShowWindow(hwnd, SW_SHOWNORMAL);
        SetForegroundWindow(hwnd);
        UpdateWindow(hwnd);

        SetLayeredWindowBitmap(hwnd, bgra.data(), w, h);
    }
    else
    {
        // If image fails, don't show an empty window.
        ShowWindow(hwnd, SW_HIDE);
    }

    if (s.readyEvent)
    {
        SetEvent(s.readyEvent);