CBaseControlVideo::SetSourceRect

Microsoft DirectShow 9.0

CBaseControlVideo::SetSourceRect

The SetSourceRect method sets the current source video rectangle (pure virtual). This is an internal member function that gets called when the source rectangle changes.

Syntax

  virtual HRESULT SetSourceRect(
    RECT *pSourceRect
) PURE;

Parameters

pSourceRect

Pointer to the source rectangle.

Return Value

Returns an HRESULT value.

Remarks

Derived classes should override this member function to know when the source rectangle changes. It is called from the following member functions.

• CBaseControlVideo::SetSourcePosition
• CBaseControlVideo::put_SourceLeft
• CBaseControlVideo::put_SourceWidth
• CBaseControlVideo::put_SourceTop
• CBaseControlVideo::put_SourceHeight

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

HRESULT CVideoText::SetSourceRect(RECT *pSourceRect)
{
    m_pRenderer->m_DrawImage.SetSourceRect(pSourceRect);
    return NOERROR;
}

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.

Requirements

**  Header:** Declared in Ctlutil.h; include Streams.h.

**  Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).

See Also

• CBaseControlVideo Class