Question

Let’s say a render target was created via ID2D1Factory::CreateDxgiSurfaceRenderTarget.

Then the render target was passed to my function. I only have the target and not the IDXGISurface.

Is there a way to access IDXGISurface from the target?
QueryInterface doesn’t retrieve it.

DirectX 10. Windows 7.

Thank you.

Answer 1

Unfortunately, this is not available. The render target and the DXGI surface are different objects and thus QueryInterface will not work. Internally, the render target holds a pointer to the underlying DXGI surface.

This is more explicit and manageable in Direct2D 1.1 (DirectX 11.1) where you can wrap the DXGI surface in a Direct2D bitmap (CreateBitmapFromDxgiSurface), which is then set as the target (SetTarget) of a Direct2D 1.1 render target (ID2D1DeviceContext). You can then ask the target for the bitmap (GetTarget) and ask the bitmap for the underlying DXGI surface (ID2D1Bitmap1::GetSurface).