void SimpleCapture::OnFrameArrived()

in cpp/ScreenCaptureforHWND/ScreenCaptureforHWND/SimpleCapture.cpp [92:139]

• 38 lines of code
• 4 McCabe index (conditional complexity)

void SimpleCapture::OnFrameArrived(
    Direct3D11CaptureFramePool const& sender,
    winrt::Windows::Foundation::IInspectable const&)
{
    auto newSize = false;

    {
        auto frame = sender.TryGetNextFrame();
		auto frameContentSize = frame.ContentSize();

        if (frameContentSize.Width != m_lastSize.Width ||
			frameContentSize.Height != m_lastSize.Height)
        {
            // The thing we have been capturing has changed size.
            // We need to resize our swap chain first, then blit the pixels.
            // After we do that, retire the frame and then recreate our frame pool.
            newSize = true;
            m_lastSize = frameContentSize;
            m_swapChain->ResizeBuffers(
                2, 
				static_cast<uint32_t>(m_lastSize.Width),
				static_cast<uint32_t>(m_lastSize.Height),
                static_cast<DXGI_FORMAT>(DirectXPixelFormat::B8G8R8A8UIntNormalized), 
                0);
        }

        {
            auto frameSurface = GetDXGIInterfaceFromObject<ID3D11Texture2D>(frame.Surface());
            
            com_ptr<ID3D11Texture2D> backBuffer;
            check_hresult(m_swapChain->GetBuffer(0, guid_of<ID3D11Texture2D>(), backBuffer.put_void()));

            m_d3dContext->CopyResource(backBuffer.get(), frameSurface.get());
        }
    }

    DXGI_PRESENT_PARAMETERS presentParameters = { 0 };
    m_swapChain->Present1(1, 0, &presentParameters);

    if (newSize)
    {
        m_framePool.Recreate(
            m_device,
            DirectXPixelFormat::B8G8R8A8UIntNormalized,
            2,
            m_lastSize);
    }
}