CBaseControlVideo.IsDefaultSourceRect method
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The IsDefaultSourceRect method determines if the renderer is using the default source rectangle (pure virtual).
Syntax
virtual HRESULT IsDefaultSourceRect() = 0;
Parameters
This method has no parameters.
Return value
Returns S_OK if the renderer is using the default source; otherwise, returns S_FALSE.
Remarks
This member function must be implemented in the derived class. It is called by the CBaseControlVideo::IsUsingDefaultSource member function.
The following example demonstrates an implementation of this function in a derived class.
// Return S_OK if using the default source; otherwise, S_FALSE.
HRESULT CVideoText::IsDefaultSourceRect()
{
RECT SourceRect;
VIDEOINFO *pVideoInfo = (VIDEOINFO *) m_pRenderer->m_mtIn.Format();
BITMAPINFOHEADER *pHeader = HEADER(pVideoInfo);
m_pRenderer->m_DrawImage.GetSourceRect(&SourceRect);
// Check the coordinates that match the video dimensions.
if (SourceRect.left != 0 || SourceRect.top != 0 ||
SourceRect.right != pHeader->biWidth ||
SourceRect.bottom != pHeader->biHeight) {
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 the media type of the input pin.
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
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