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4/8/2010

The SetBlendingParametermethod sets the blending parameter that defines how a secondary stream is blended with a primary stream.

Syntax 

HRESULT SetBlendingParameter(
  DWORD dwBlendingParameter
);

Parameters

Value Description

dwBlendingParameter

[in] Value between 0 and 255 that indicates the amount of blending between a primary stream and a secondary stream.

Return Value

Returns an HRESULTvalue. Possible values include the following:

Value Description

E_UNEXPECTED

Method called on primary stream.

E_INVALIDARG

Value outside of possible range (0 to 255).

S_OK

Success.

Remarks

The value of the dwBlendingParameterparameter must be between 0 and 255, where 0 makes the secondary stream invisible and 255 makes the primary stream invisible in the area that the secondary stream occupies. If no value is set the default is 255.

This method is not intended to be called on the primary stream.

Note Current DirectShow implementation of this interface allows only values of 0 or 255 for the dwBlendingParameterparameter. Any other values are invalid.

See Also