CDrawImage::m_SourceRect member
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 m_SourceRect member variable specifies the source rectangle for drawing. The initial value is an empty rectangle, indicating the entire image should be drawn.
Syntax
RECT m_SourceRect;
Requirements
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