IVMRMixerBitmap9::UpdateAlphaBitmapParameters method (vmr9.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The UpdateAlphaBitmapParameters method changes the bitmap location, size and blending value.
Syntax
HRESULT UpdateAlphaBitmapParameters(
[in] const VMR9AlphaBitmap *pBmpParms
);
Parameters
[in] pBmpParms
Pointer to a VMR9AlphaBitmap structure.
Return value
The method returns an HRESULT. Possible values include those in the following table.
| Return code | Description |
|---|---|
|
The method succeeded. |
Remarks
The filter graph must be running for the changes to take effect. This method does not change the bitmap image. If you specify a VMR9AlphaBitmap structure with no destination or color key set, the bitmap is not displayed. This behavior was implemented for backward compatibility.
Include DShow.h and D3d9.h before Vmr9.h.
Requirements
| Minimum supported client | Windows XP with SP2 [desktop apps only] |
| Minimum supported server | Windows Server 2003 R2 [desktop apps only] |
| Target Platform | Windows |
| Header | vmr9.h |
| Library | Strmiids.lib |