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d3d11videosink: Add present signal

Seungha Yang requested to merge seungha.yang/gstreamer:d3d11videosink-new-signal into main 
    examples: d3d11videosink: Add present signal example

    Add an example to show the usage of present singal.
    In this example, a text overlay with alpha blended background
    will be rendered on swapchain's backbuffer by using
    Direct3D11, Direct2D, and DirectWrite APIs.
    d3d11videosink: Add display-format property

    Make swapchian's display format configurable, since some DXGI formats
    we can use for swapchain are not API interop compatible.
    For instance, BGRA format should be used for Direct2D interop.
    d3d11videosink: Add present signal

    The "present" signal will be emitted just before the
    IDXGISwapChain::Present() call. The client can perform additional
    GPU operation with given GstD3D11Device object and
    ID3D11RenderTargetView handle. Or, the client can read back
    the scene to be displayed on window using the signal.

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