How to extract bitmap out of Direct3D 11 Texture2D object?

Question

I am using the Desktop Duplication API (C++) and have created an output duplication object and further queried the interface for a ID3D11Texture2D object.

I have tried using "D3DX11SaveTextureToFile" and "DirectX::SaveWICTextureToFile" but it gives an error. I need to extract the bitmap or pixel buffer out of this texture so that I can save it as an image. I have tried using a subresource and ID3D11DeviceContext::Map function to extract the pixel buffer but it seems to be empty. But context->Draw() seems to work.

Is there anyway I can extract the pixel buffer/bitmap/image out of the texture2D object?

Thanks!

UPDATE : I solved this using the CaptureTexture function in DirectXTex. You can create a HBITMAP from the resultant ScratchImage

@ChuckWalbourn : D3DX11SaveTextureToFile gives "Attempted to create a device with the debug layer enabled and the layer is not installed" Directx::SaveWICTextureToFile gives "No such interface supported" — arch3r
D3DX11 is deprecated and hasn't been updated in many years, so the error output is probably trying to turn E_NOINTERFACE into something meaningful which it isn't anymore. Can you tell me exactly which line of code in ScreenGrab.cpp or DirectXTexWIC.cpp where you are seeing this error generated? — Chuck Walbourn
@ChuckWalbourn : IWICImagingFactory* pWIC = _GetWIC(); is failing and the return is E_NOINTERFACE — arch3r
What OS are you using? Which vcxproj/sln file or NuGet version of DirectXTex are you using? Depending on how you build the code, _GetWIC will either try to use WIC2 and then WIC1, or just WIC1. See this post — Chuck Walbourn

blueshogun96 blueshogun96 · Accepted Answer · 2019-03-22T00:47:33

For those who are getting E_NOINTERFACE as their return code from DirectX::SaveWICTextureToFile, you need to initialize COM using one of the following:

HRESULT hr = CoInitialize(nullptr); // Single threaded

HRESULT hr = CoInitializeEx(nullptr, COINITBASE_MULTITHREADED);  // For multithreaded programs

Don't forget to call CoUninialize() after you are done. This is because WIC uses COM and must be initialized before using it.

How to extract bitmap out of Direct3D 11 Texture2D object?

1 Answers