IVMRMixerBitmap9::UpdateAlphaBitmapParameters method (vmr9.h)

Artigo
4/26/2023

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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
S_OK	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

Requirement	Value
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

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