public static extern void FlifDestroyDecoder(FlifDecoderPointer decoder);
public static extern UIntPtr FlifDecoderNumImages(FlifDecoderPointer decoder);
public static extern FlifImagePointer FlifDecoderGetImage(FlifDecoderPointer decoder, UIntPtr index);
public static extern int FlifDecoderDecodeMemory(FlifDecoderPointer decoder, [In] IntPtr buffer, UIntPtr size);