Resizing Render Target Direct2D after WM_SIZE

问题:

Quick question guys... I am currently working with Directx3D and 2D and I was wondering if I have to recreate the render target when the Windows is resized or does Direct2D automatically detects this, since it's bound to the DXGISurface(back-buffer of the swapchain) when I created it.

Here is the code that I used to bind the render targets together:

ComPtr<IDXGISurface1> dxgibackBuffer;
hr = m_pDxSwapchain->GetBuffer(0, IID_PPV_ARGS(&dxgibackBuffer));

D2D1_BITMAP_PROPERTIES1 bitmapProperties = D2D1::BitmapProperties1(
    D2D1_BITMAP_OPTIONS_TARGET | D2D1_BITMAP_OPTIONS_CANNOT_DRAW,
    D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_IGNORE),
    96.0f,
    96.0f);
hr = m_pD2DContext->CreateBitmapFromDxgiSurface(dxgibackBuffer.Get(), &bitmapProperties, &m_pD2DTargetBitmap);

// last step
m_pD2DContext->SetTarget(m_pD2DTargetBitmap.Get());

回答1:

See Care_and_Feeding_of_the_Swap_Chain and Handling_Window_Resizing

Quote1: Naturally, the application's best route is to respond to WM_SIZE, and call IDXGISwapChain::ResizeBuffers, passing the size contained in the message's parameters.

Quote2: Before you call ResizeBuffers, you must release all outstanding references to the swap chain's buffers. The object that typically holds a reference to a swap chain's buffer is a render-target-view.