Add annotations to lookup table, needed for display, and update test

IO/GDAL/Testing/Cxx/CMakeLists.txt

@@ -9,6 +9,6 @@ vtk_add_test_cxx(${vtk-module}CxxTests tests
   TestGDALVectorReader.cxx
   TestGDALRasterReader.cxx
   TestGDALRasterNoDataValue.cxx,NO_VALID,NO_OUTPUT
-  TestGDALRasterPalette.cxx,NO_VALID,NO_OUTPUT
+  TestGDALRasterPalette.cxx
   )
 vtk_test_cxx_executable(${vtk-module}CxxTests tests)

IO/GDAL/Testing/Cxx/TestGDALRasterPalette.cxx

@@ -14,9 +14,16 @@
 =========================================================================*/
 #include <vtkDataArray.h>
 #include <vtkGDALRasterReader.h>
+#include <vtkImageActor.h>
+#include <vtkImageProperty.h>
 #include <vtkLookupTable.h>
 #include <vtkNew.h>
 #include <vtkPointData.h>
+#include <vtkRegressionTestImage.h>
+#include <vtkRenderWindow.h>
+#include <vtkRenderer.h>
+#include <vtkRenderWindow.h>
+#include <vtkRenderWindowInteractor.h>
 #include <vtkUniformGrid.h>
 
 #include <iostream>
@@ -44,13 +51,12 @@ int TestGDALRasterPalette(int argc, char** argv)
     std::cerr << "ERROR: Missing point data scalars" << std::endl;
     return 1;
     }
-  if (image->GetPointData()->GetScalars()->GetSize() != 300*300)
+  if (image->GetPointData()->GetScalars()->GetSize() == 0)
     {
-    std::cerr << "ERROR: Point data scalars wrong size, not."
-              << (300*300) << ". Instead "
-              << image->GetPointData()->GetScalars()->GetSize() << std::endl;
+    std::cerr << "ERROR: Point data scalars empty" << std::endl;
     return 1;
     }
+  //image->GetPointData()->GetScalars()->Print(std::cout);
 
   // Check that reader generated color table
   vtkLookupTable *colorTable =
@@ -67,6 +73,36 @@ int TestGDALRasterPalette(int argc, char** argv)
               << std::endl;
     return 1;
     }
+  //colorTable->Print(std::cout);
 
-  return 0;
+  // Create a renderer and actor
+  vtkNew<vtkRenderer> renderer;
+  vtkNew<vtkImageActor> actor;
+  actor->SetInputData(reader->GetOutput());
+  actor->InterpolateOff();
+  //actor->GetProperty()->SetInterpolationTypeToNearest();
+  actor->GetProperty()->SetLookupTable(colorTable);
+  actor->GetProperty()->UseLookupTableScalarRangeOn();
+  renderer->AddActor(actor.GetPointer());
+
+  // Create a render window, and an interactor
+  vtkNew<vtkRenderWindow> renderWindow;
+  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
+  renderWindow->AddRenderer(renderer.GetPointer());
+  renderWindowInteractor->SetRenderWindow(renderWindow.GetPointer());
+
+  //Add the actor to the scene
+  renderer->SetBackground(1.0, 1.0, 1.0);
+  renderWindow->SetSize(400, 400);
+  renderWindow->Render();
+  renderer->ResetCamera();
+  renderWindow->Render();
+
+  int retVal = vtkRegressionTestImage(renderWindow.GetPointer());
+  if (retVal == vtkRegressionTester::DO_INTERACTOR)
+    {
+    renderWindowInteractor->Start();
+    }
+
+  return !retVal;
 }

IO/GDAL/Testing/Data/Baseline/TestGDALRasterPalette.png.md5

+70aff17ba9e4a0d5c6cffb720f381d26

IO/GDAL/vtkGDALRasterReader.cxx

@@ -45,6 +45,7 @@
 // C/C++ includes
 #include <cassert>
 #include <iostream>
+#include <sstream>
 #include <vector>
 
 vtkStandardNewMacro(vtkGDALRasterReader);
@@ -483,6 +484,7 @@ void vtkGDALRasterReader::vtkGDALRasterReaderInternal::GenericReadData()
 
   if (paletteBand)
     {
+    this->UniformGridData->GetPointData()->GetScalars()->SetName("Categories");
     this->UniformGridData->GetPointData()->GetScalars()->SetLookupTable(
       colorTable);
     }
@@ -655,17 +657,38 @@ void vtkGDALRasterReader::vtkGDALRasterReaderInternal::ReadColorTable(
     return;
     }
 
+  char **categoryNames = rasterBand->GetCategoryNames();
+
   colorTable->IndexedLookupOn();
   int numEntries = gdalTable->GetColorEntryCount();
   colorTable->SetNumberOfTableValues(numEntries);
+  std::stringstream ss;
   for (int i=0; i< numEntries; ++i)
     {
     const GDALColorEntry *gdalEntry = gdalTable->GetColorEntry(i);
-    double r = gdalEntry->c1 / 255.0;
-    double g = gdalEntry->c2 / 255.0;
-    double b = gdalEntry->c3 / 255.0;
-    double a = gdalEntry->c4 / 255.0;
+    double r = static_cast<double>(gdalEntry->c1) / 255.0;
+    double g = static_cast<double>(gdalEntry->c2) / 255.0;
+    double b = static_cast<double>(gdalEntry->c3) / 255.0;
+    double a = static_cast<double>(gdalEntry->c4) / 255.0;
     colorTable->SetTableValue(i, r, g, b, a);
+
+    // Copy category name to lookup table annotation
+    if (categoryNames)
+      {
+      // Only use non-empty names
+      if (strlen(categoryNames[i]) > 0)
+        {
+        colorTable->SetAnnotation(vtkVariant(i), categoryNames[i]);
+        }
+      }
+    else
+      {
+      // Create default annotation
+      ss.str("");
+      ss.clear();
+      ss << "Category " << i;
+      colorTable->SetAnnotation(vtkVariant(i), ss.str());
+      }
     }
 }