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- Refactor GetNaNColorAsUnsignedChars function to make it useful to retrieve other colors as unsigned char - Refactor the index lookup in vtkLookupTable - Refactor shift and scale computation throughout vtkLookupTable - Put internal functions into anonymous namespace to avoid potential duplicate symbol errors when linking - Stuff lookup table parameters into struct and pass it around the internal functions - Copy NanColor in DeepCopy() These changes result in up to 6% performance improvement in vtkLookupTable::MapScalarsThroughTable2(). Change-Id: If6147725ac80d929d475fefacdcd787ea4568eb8
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