Add support of VTK_BIT type in vtkAbstractArray::GetVariantValue

Common/Core/Testing/Cxx/TestBitArray.cxx

@@ -5,6 +5,7 @@
 
 #include "vtkNew.h"
 
+#include <array>
 #include <bitset>
 #include <string>
 
@@ -77,5 +78,27 @@ int TestBitArray(int, char*[])
     return EXIT_FAILURE;
   }
 
+  // Test GetVariantValue accessor
+  array->Resize(4);
+  array->SetValue(0, 0);
+  array->SetValue(1, 1);
+  array->SetValue(2, 1);
+  array->SetValue(3, 0);
+
+  std::array<int, 4> variantValues = {
+    array->GetVariantValue(0).ToInt(),
+    array->GetVariantValue(1).ToInt(),
+    array->GetVariantValue(2).ToInt(),
+    array->GetVariantValue(3).ToInt(),
+  };
+
+  if (variantValues != std::array<int, 4>{ 0, 1, 1, 0 })
+  {
+    std::cerr << "GetVariantValue return invalid data \"{" << variantValues[0] << ", "
+              << variantValues[1] << ", " << variantValues[2] << ", " << variantValues[3]
+              << "}\", it should be \"{0, 1, 1, 0}\"" << std::endl;
+    return EXIT_FAILURE;
+  }
+
   return EXIT_SUCCESS;
 }

Common/Core/vtkAbstractArray.cxx

@@ -528,6 +528,8 @@ vtkVariant vtkAbstractArray::GetVariantValue(vtkIdType valueIdx)
   {
     vtkExtraExtendedTemplateMacro(val = vtkAbstractArrayGetVariantValue(
                                     static_cast<VTK_TT*>(this->GetVoidPointer(0)), valueIdx));
+    vtkTemplateMacroCase(
+      VTK_BIT, int, val = static_cast<VTK_TT>(static_cast<vtkBitArray*>(this)->GetValue(valueIdx)));
   }
   return val;
 }