.net - fastest/performance approach to share large Bitmap object between managed and unmanaged functions -

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while working on computer vision application having gui in wpf.net , being processed using native libraries (opencv , more),
fastest way send , receive large size bitmaps between managed (c#.net) , un-managed (native c/c++ ) functions ? feel copying bitmap data managed unmanaged memory not fastest way , there should better alternative...

i found out few approaches, if approve or suggest better alternatives:

approach 1: using pin_ptr
'pin' memory, use pin_ptr instead of copying (marshalling) pixel data of bitmap object managed unmanaged increasing performance / speed

approach 2: unmanaged wpf imaging component.

approach 3: hbitmap::lockbits()
it lock bitmap , makes available pixel data handle, have seen allocate memory.


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