IOverlayNotify::OnClipChange (Windows Embedded CE 6.0)
1/6/2010
This method provides notification that the window's visible region has changed. It is essential that any overlay hardware be updated to reflect the change to the visible region before returning from this method.
Syntax
HRESULT OnClipChange(
RECT* pSourceRect,
RECT* pDestinationRect,
RGNDATA* pRgnData
);
Parameters
- pSourceRect
[in] A pointer to a RECT structure that defines the region of the video to use.
- pDestinationRect
[in] A pointer to a RECT structure that Video destination.
- pRgnData
[in] A pointer to a RGNDATA structure that continas the clipping information.
Return Value
Returns an HRESULT value that depends on the implementation.
HRESULT can 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
The calls to OnClipChange happen in synchronization with the window. It is called with an empty clip list to freeze the video before the window moves, and then called again when the window has stabilized with the new clip list.
If the window rectangle is all zeros, the window is invisible. The filter must take a copy of the information if it needs to store it.
Requirements
| Windows Embedded CE | Windows CE 2.12 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 |