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Windows Driver Kit DDI reference (nc-d3dumddi-pfnd3dddi_createoverlaycb)

PFND3DDDI_CREATEOVERLAYCB callback function

Description

The pfnCreateOverlayCb function creates a kernel-mode overlay object and calls the display miniport driver to display the overlay.

Parameters

`hDevice`

A handle to the display device (graphics context).

`unnamedParam2`

pData [in, out]

A pointer to a D3DDDICB_CREATEOVERLAY structure that describes the overlay to create.

Return value

pfnCreateOverlayCb returns one of the following values:

Return code	Description
S_OK	The overlay object was successfully created.
D3DDDIERR_NOTAVAILABLE	pfnCreateOverlayCb failed because of a lack of overlay hardware or bandwidth.
E_INVALIDARG	Parameters were validated and determined to be incorrect.
E_OUTOFMEMORY	pfnCreateOverlayCb could not allocate memory that was required for it to complete.

This function might also return other HRESULT values.

Remarks

The pfnCreateOverlayCb function returns a handle to the newly created kernel-mode overlay object in the hKernelOverlay member of the D3DDDICB_CREATEOVERLAY structure that is pointed to by pData. The user-mode display driver passes this handle in calls to the following functions:

The following code example shows how to create an overlay object.

D3DKMT_HANDLE g_hOverlay = NULL;

HRESULT CD3DContext::CreateOverlay(D3DDDIARG_CREATEOVERLAY* pCreateOverlay) {
    D3DDDICB_CREATEOVERLAY CreateCB;
    DWORD_PTR dwResource = (DWORD_PTR) pCreateOverlay->OverlayInfo.hResource;
    dwResource += pCreateOverlay->OverlayInfo.SubResourceIndex;
    LONG dwTempPitch;

    pCreateOverlay->hOverlay = (HANDLE) 0x27;

    CreateCB.VidPnSourceId = 0;
    CreateCB.OverlayInfo.hAllocation = R200GetAllocationHandle(m_pR200Ctx,
                                     (DWORD)dwResource,
                                      &dwTempPitch);

    CreateCB.OverlayInfo.DstRect.left = pCreateOverlay->OverlayInfo.DstRect.left;
    CreateCB.OverlayInfo.DstRect.right = pCreateOverlay->OverlayInfo.DstRect.right;
    CreateCB.OverlayInfo.DstRect.top = pCreateOverlay->OverlayInfo.DstRect.top;
    CreateCB.OverlayInfo.DstRect.bottom = pCreateOverlay->OverlayInfo.DstRect.bottom;

    CreateCB.OverlayInfo.SrcRect.left = pCreateOverlay->OverlayInfo.SrcRect.left;
    CreateCB.OverlayInfo.SrcRect.right = pCreateOverlay->OverlayInfo.SrcRect.right;
    CreateCB.OverlayInfo.SrcRect.top = pCreateOverlay->OverlayInfo.SrcRect.top;
    CreateCB.OverlayInfo.SrcRect.bottom = pCreateOverlay->OverlayInfo.SrcRect.bottom;

    CreateCB.OverlayInfo.pPrivateDriverData = "This is a test";
    CreateCB.OverlayInfo.PrivateDriverDataSize = 10;

    HRESULT hr = m_d3dCallbacks.pfnCreateOverlayCb(m_hD3D, &CreateCB);

    if (SUCCEEDED(hr)) {
        g_hOverlay = CreateCB.hKernelOverlay;
    }

    return hr;
}

PFND3DDDI_CREATEOVERLAYCB - NtDoc