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This method provides notification that the position has changed.
Syntax
HRESULT OnPositionChange( const RECT* pSourceRect, const RECT* pDestinationRect ); |
Parameters
- pSourceRect
-
[in] A pointer to a RECTstructure that describes the source video rectangle.
- pDestinationRect
-
[in] A pointer to a RECTstructure that describes the destination video rectangle. Note that this is not clipped to the visible display area.
Return Value
Returns an HRESULTvalue that depends on the implementation.
HRESULTcan be one of the following standard constants, or other values not listed.
Value | Description |
---|---|
E_FAIL |
Failure. |
E_POINTER |
Null pointer argument. |
E_INVALIDARG |
Invalid argument. |
E_NOTIMPL |
Method is not supported. |
S_OK or NOERROR |
Success. |
Remarks
This method is a callback intended for use by hardware overlay cards that do not want the expense of synchronous clipping updates, and just want to know when the source or destination video positions change.
Unlike the IOverlayNotify::OnClipChangemethod, this method is not called in synchronization with the window changing but, rather, at some point after the window has changed (basically in time with WM_SIZE messages received). This is therefore suitable for overlay cards that do not inlay their data to the frame buffer.
Requirements
Windows Embedded CE | Windows CE 2.12 and later |
Windows Mobile | Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later |
Note | Microsoft DirectShow applications and DirectShow filters have
different include file and Library requirements
For more information, see Setting Up the Build Environment,Version 2.12 requires DXPAK 1.0 or later |
See Also
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