|Microsoft DirectX 9.0|
The SetSourceRect method sets the source rectangle.
void SetSourceRect( RECT *pSourceRect );
Pointer to a RECT structure that defines the new source rectangle.
No return value.
The owning filter should call this method if the source rectangle changes; for example, in response to an IBasicVideo::SetSourcePosition call.
Validate the rectangle given in pSourceRect before calling this method, to make sure it does not extend beyond the native video size.