| Microsoft DirectX 9.0 |
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
The method returns an HRESULT. Possible values include those in the following table.
| Value | Description |
| S_OK | The method succeeded. |
| VFW_E_NOT_CONNECTED | The pin is not connected. |
Remarks
The alpha value specified can range from 0.0 (fully transparent) to 1.0 (full opaque).
Requirements
Include D3d9.h, Vmr9.h.
See Also