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Called by the filter to determine whether to remove the opacity of a layer by premultiplying it against the palette colors.
Syntax
HRESULT retVal = object.IsAlphaPremultRequired(pfPremultAlpha);
Parameters
pfPremultAlpha [out]
Type: BOOLAddress of a BOOL variable that receives TRUE if a premultiply operation is required, or FALSE otherwise.
Return value
Type: HRESULT
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
Remarks
A premultiply operation, where color components are adjusted by their corresponding alpha components, is required if the image palette contains alpha information and the palette is being converted to BFID_RGBA_32 format.