IVMRMixerBitmap::UpdateAlphaBitmapParameters method (strmif.h)

The UpdateAlphaBitmapParameters method changes the bitmap location, size and blending value.


HRESULT UpdateAlphaBitmapParameters(


[in] pBmpParms

A pointer to a VMRALPHABITMAP structure.

Return value

If the method succeeds, it returns S_OK. If it fails, it returns an error code.


The filter graph must be running for the changes to take effect. This method does not change the bitmap image. If you specify a VMRALPHABITMAP structure with no destination or color key set, the bitmap disappears. This behavior is by design for backward compatibility and cannot be changed.


Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)
Library Strmiids.lib

See also

Error and Success Codes

IVMRMixerBitmap Interface

Using the Video Mixing Renderer

Video Mixing Renderer Filter 7