hwnd (HWND) - input

      Handle of window for which the presentation space is required.

    hwndClipWindow (HWND) - input

      Handle of window for clipping.

      Values to be specified can be one of the following:

      HWND_BOTTOM

        Clip the last window in the sibling chain and continue clipping until the next window is hwnd or NULLHANDLE.
      HWND_TOP
        Clip the first window in the sibling chain and continue clipping until the next window is hwnd or NULLHANDLE.
      NULLHANDLE
        Clip all siblings to the window hwnd.

      ulClipflags (ULONG) - input

        Clipping control flags.

        PSF_CLIPSIBLINGS

          Clip out all siblings of hwnd.
        PSF_CLIPCHILDREN
          Clip out all children of hwnd.
        PSF_CLIPUPWARDS
          Taking hwndClipWindow as a reference window, clip out all sibling windows before hwndClipWindow. This value may not be used with PSF_CLIPDOWNWARDS.
        PSF_CLIPDOWNWARDS
          Taking hwndClipWindow as a reference window, clip out all sibling windows after hwndClipWindow. This value may not be used with PSF_CLIPUPWARDS.
        PSF_LOCKWINDOWUPDATE
          Calculate a presentation space that keeps a visible region even though output may be locked by the WinLockWindowUpdate function.
        PSF_PARENTCLIP
          Calculate a presentation space that uses the visible region of the parent of hwnd but with an origin calculated for hwnd.

        hps (HPS) - returns

          Presentation-space handle that can be used for drawing.

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