IDirect3DRMViewport::ForceUpdate

HRESULT ForceUpdate(DWORD dwX1, DWORD dwY1, DWORD dwX2,

DWORD dwY2);

Forces an area of the viewport to be updated. The specified area will be copied to the screen at the next call to the IDirect3DRMDevice::Update method.

·Returns D3DRM_OK if successful, or an error otherwise. For a list of possible return codes, see Direct3D Retained-Mode Return Values.

dwX1 and dwY1

Upper-left corner of area to be updated.

dwX2 and dwY2

Lower-right corner of area to be updated.

The system might update any region that is larger than the specified rectangle, including possibly the entire window.