CustomStreamSeeker typedef
CustomStreamSeeker = Pointer<NativeFunction<MagickOffsetType Function(MagickOffsetType, Int, Pointer<Void> )> >
Implementation
typedef CustomStreamSeeker = ffi.Pointer<
ffi.NativeFunction<
MagickOffsetType Function(
MagickOffsetType, ffi.Int, ffi.Pointer<ffi.Void>)>>;