// d3dkmthk.h

PFND3DKMT_CHECKOCCLUSION Pfnd3dkmtCheckocclusion;

NTSTATUS Pfnd3dkmtCheckocclusion(
  const D3DKMT_CHECKOCCLUSION *unnamedParam1
)
{...}
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Windows Driver Kit DDI reference (nc-d3dkmthk-pfnd3dkmt_checkocclusion)

PFND3DKMT_CHECKOCCLUSION callback function

Description

The D3DKMTCheckOcclusion function verifies whether the client area of a window is occluded.

Parameters

`unnamedParam1`

pData [in]

A pointer to a D3DKMT_CHECKOCCLUSION structure that describes parameters for checking occlusion.

Return value

D3DKMTCheckOcclusion returns one of the following values:

Return code	Description
STATUS_SUCCESS	The client area of the window is not occluded.
STATUS_GRAPHICS_PRESENT_OCCLUDED	The client area of the window is occluded.
STATUS_INVALID_PARAMETER	Parameters were validated and determined to be incorrect.

This function might also return other NTSTATUS values.

Remarks

The handle to the window that is checked for occlusion must be valid. A window is not occluded if a part of its client area lies on an unowned video present network (VidPn) source, if its client area is an empty rectangular area (RECT), or if desktop composition is running.

PFND3DKMT_CHECKOCCLUSION - NtDoc