Desktop Duplication get buffer

[AhmedX6]

Hello!

I would like to implement my own mirroring protocol, I'm trying to use Windows Desktop Duplication API for the client. https://msdn.microsoft.com/en-us/library/windows/desktop/hh404487(v=vs.85).aspx

My server is an Android device with an OpenGL surface to display the buffer.

I send only when desktop pixels are modified. I would like to retrieve a buffer with position of pixel that has been moved and send only that to the Android device. Is it possible to do it with the Desktop Duplication API ?

Thank you for your help !

[hecomi]

Desktop Duplication API provides dirty rects and move rects as written in the document. Using dirty rects as update areas is simple and nice method as your first step, I think.

[AhmedX6]

The problem is how to get the buffer of pixels that I have to send ? I think I understood Dirty Rect : it's like a merge of all rects that have been updated to make a single rect. But how to get pixels that is inside and send them to update the framebuffer on client side ?

[hecomi]

IDXGIOutputDuplication has GetFrameDirtyRects() and you can get RECT list through this API.

• https://msdn.microsoft.com/en-us/library/windows/desktop/hh404619(v=vs.85).aspx

Please see the implementation of Duplicator.cpp as your reference.

• https://github.com/hecomi/uDesktopDuplication/blob/master/Plugins/uDesktopDuplication/uDesktopDuplication/Duplicator.cpp

The question seems to be a general one and is not related to this plugin. So I closed this issue.

[AhmedX6]

Thank you very much for your answer. I do not know if you can or not to help me by e-mail or skype to implement this API on a QT project. This is a final project in computer engineering and I really need help. I will never thank you enough ...

I already encounter difficulties on a structure that would be unrecognized while the DirectX paths are added: DXGI_OUTDUPL_FRAME_INFO yet I have included and the -ldxgi is in my .pro file.