CBaseControlVideo::IsDefaultTargetRect

The IsDefaultTargetRect method determines if the renderer is using the default target rectangle (pure virtual).

Syntax

virtual HRESULT IsDefaultTargetRect(void) PURE;

Return Value

Returns S_OK if the renderer is using the default target; otherwise, returns S_FALSE.

Remarks

This member function must be implemented in the derived class. It is called by the CBaseControlVideo::IsUsingDefaultDestination member function.

The following example demonstrates an implementation of this function in a derived class.

// Return S_OK if using the default target; otherwise, S_FALSE.
HRESULT CVideoText::IsDefaultTargetRect()
{
    RECT TargetRect;

    VIDEOINFO *pVideoInfo = (VIDEOINFO *) m_pRenderer->m_mtIn.Format();
    BITMAPINFOHEADER *pHeader = HEADER(pVideoInfo);
    m_pRenderer->m_DrawImage.GetTargetRect(&TargetRect);

    // Check the destination that matches the initial client area.

    if (TargetRect.left != 0 || TargetRect.top != 0 ||
            TargetRect.right != m_Size.cx ||
                TargetRect.bottom != m_Size.cy) {
                    return S_FALSE;
    }
    return S_OK;
}

In this example, CVideoText is a class derived from CBaseControlVideo, m_pRenderer holds an object of a class derived from CBaseVideoRenderer, and the m_DrawImage data member, defined in the derived class, holds a CDrawImage object. The m_mtIn data member, also defined in the derived class, holds a CMediaType object with media type of the input pin.

See Also

• CBaseControlVideo Class