| Microsoft DirectX 8.1 (C++) |
This topic applies to Windows XP Home Edition and Windows XP Professional only.
The SetAlpha method sets a constant alpha value that is applied to this video stream.
Syntax
HRESULT SetAlpha(
DWORD dwStreamID,
float Alpha
);
Parameters
dwStreamID
[in] Specifies the input stream.
Alpha
[in] Specifies the alpha blending value to be applied to all the pixels in this stream.
Return Values
If the method succeeds, it returns S_OK. If it fails, it returns an error code.
| Error Code | Description |
| VFW_E_NOT_CONNECTED | The pin is not connected. |
Remarks
The alpha value specified can be between 0.0 (fully transparent) and 1.0 (full opaque).
See Also