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Called by the filter when the palette associated with surface changes.
Syntax
HRESULT retVal = object.OnPalette();
Parameters
This method has no parameters.
Return value
Type: HRESULT
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
Remarks
Use only if IMGDECODE_EVENT_PALETTE flag was returned in pdwEvents parameter of IImageDecodeEventSink::OnBeginDecode.