IDxtAlphaSetter::put_AlphaRamp method
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]
Note
[Deprecated. This API may be removed from future releases of Windows.]
The put_AlphaRamp method specifies the alpha ramp property. The alpha ramp is the percentage by which the alpha values in the original image are adjusted. For example, if the alpha ramp is 0.5, the alpha values in the image are reduced 50%.
Syntax
HRESULT put_AlphaRamp(
[in] double Alpha
);
Parameters
-
Alpha [in]
-
The alpha ramp as a percentage. For example, 1.0 is 100%. To disable this property, set a negative value.
Return value
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
Remarks
If you set this property to a non-negative value, you must also disable the alpha property, by calling put_Alpha with a negative value. Otherwise the effect will not render correctly.
Note
The header file Qedit.h is not compatible with Direct3D headers later than version 7.
Note
To obtain Qedit.h, download the Microsoft Windows SDK Update for Windows Vista and .NET Framework 3.0. Qedit.h is not available in the Microsoft Windows SDK for Windows 7 and .NET Framework 3.5 Service Pack 1.
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
|
See also