IVMRMixerBitmap::UpdateAlphaBitmapParameters method (strmif.h)

Article
02/22/2024

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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] PVMRALPHABITMAP pBmpParms
);

Parameters

[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.

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 VMRALPHABITMAP structure with no destination or color key set, the bitmap disappears. This behavior is by design for backward compatibility and cannot be changed.

Requirements

Requirement	Value
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