Method ReadColorTable

IO/GDAL/vtkGDALRasterReader.cxx:726–770

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//------------------------------------------------------------------------------
void vtkGDALRasterReader::vtkGDALRasterReaderInternal::ReadColorTable(
  GDALRasterBand* rasterBand, vtkLookupTable* colorTable) const
{
  GDALColorTable* gdalTable = rasterBand->GetColorTable();
  if (gdalTable->GetPaletteInterpretation() != GPI_RGB)
  {
    std::cerr << "Color table palette type not supported " << gdalTable->GetPaletteInterpretation()
              << std::endl;
    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 = 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());
    }
  }
}

//------------------------------------------------------------------------------
void vtkGDALRasterReader::vtkGDALRasterReaderInternal::SelectionCallback(vtkObject* vtkNotUsed(obj),