DXGI_OUTDUPL_FRAME_INFO structure (dxgi1_2.h)

The DXGI_OUTDUPL_FRAME_INFO structure describes the current desktop image.

Syntax

typedef struct DXGI_OUTDUPL_FRAME_INFO {
  LARGE_INTEGER                 LastPresentTime;
  LARGE_INTEGER                 LastMouseUpdateTime;
  UINT                          AccumulatedFrames;
  BOOL                          RectsCoalesced;
  BOOL                          ProtectedContentMaskedOut;
  DXGI_OUTDUPL_POINTER_POSITION PointerPosition;
  UINT                          TotalMetadataBufferSize;
  UINT                          PointerShapeBufferSize;
} DXGI_OUTDUPL_FRAME_INFO;

Members

LastPresentTime

The time stamp of the last update of the desktop image. The operating system calls the QueryPerformanceCounter function to obtain the value. A zero value indicates that the desktop image was not updated since an application last called the IDXGIOutputDuplication::AcquireNextFrame method to acquire the next frame of the desktop image.

LastMouseUpdateTime

The time stamp of the last update to the mouse. The operating system calls the QueryPerformanceCounter function to obtain the value. A zero value indicates that the position or shape of the mouse was not updated since an application last called the IDXGIOutputDuplication::AcquireNextFrame method to acquire the next frame of the desktop image. The mouse position is always supplied for a mouse update. A new pointer shape is indicated by a non-zero value in the PointerShapeBufferSize member.

AccumulatedFrames

The number of frames that the operating system accumulated in the desktop image surface since the calling application processed the last desktop image. For more information about this number, see Remarks.

RectsCoalesced

Specifies whether the operating system accumulated updates by coalescing dirty regions. Therefore, the dirty regions might contain unmodified pixels. TRUE if dirty regions were accumulated; otherwise, FALSE.

ProtectedContentMaskedOut

Specifies whether the desktop image might contain protected content that was already blacked out in the desktop image. TRUE if protected content was already blacked; otherwise, FALSE. The application can use this information to notify the remote user that some of the desktop content might be protected and therefore not visible.

PointerPosition

A DXGI_OUTDUPL_POINTER_POSITION structure that describes the most recent mouse position if the LastMouseUpdateTime member is a non-zero value; otherwise, this value is ignored. This value provides the coordinates of the location where the top-left-hand corner of the pointer shape is drawn; this value is not the desktop position of the hot spot.

TotalMetadataBufferSize

Size in bytes of the buffers to store all the desktop update metadata for this frame. For more information about this size, see Remarks.

PointerShapeBufferSize

Size in bytes of the buffer to hold the new pixel data for the mouse shape. For more information about this size, see Remarks.

Remarks

A non-zero LastMouseUpdateTime indicates an update to either a mouse pointer position or a mouse pointer position and shape. That is, the mouse pointer position is always valid for a non-zero LastMouseUpdateTime; however, the application must check the value of the PointerShapeBufferSize member to determine whether the shape was updated too.

If only the pointer was updated (that is, the desktop image was not updated), the AccumulatedFrames, TotalMetadataBufferSize, and LastPresentTime members are set to zero.

An AccumulatedFrames value of one indicates that the application completed processing the last frame before a new desktop image was presented. If the AccumulatedFrames value is greater than one, more desktop image updates have occurred while the application processed the last desktop update. In this situation, the operating system accumulated the update regions. For more information about desktop updates, see Desktop Update Data.

A non-zero TotalMetadataBufferSize indicates the total size of the buffers that are required to store all the desktop update metadata. An application cannot determine the size of each type of metadata. The application must call the IDXGIOutputDuplication::GetFrameDirtyRects, IDXGIOutputDuplication::GetFrameMoveRects, or IDXGIOutputDuplication::GetFramePointerShape method to obtain information about each type of metadata.

Requirements

See also

DXGI Structures

IDXGIOutputDuplication::AcquireNextFrame