ParaView-5.0.1: Added the source-tree to ThirdParty-dev and patched as described in the README file

Resolves bug-report http://bugs.openfoam.org/view.php?id=2098

ParaView-5.0.1/CoProcessing/PythonCatalyst/Testing/Cxx/CompareImages.cxx

@@ -0,0 +1,72 @@
+/*=========================================================================
+
+  Program:   ParaView
+  Module:    CompareImages.cxx
+
+  Copyright (c) Kitware, Inc.
+  All rights reserved.
+  See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notice for more information.
+
+=========================================================================*/
+#include "vtkImageData.h"
+#include "vtkPNGReader.h"
+#include "vtkSmartPointer.h"
+#include <vtksys/SystemTools.hxx>
+#include "vtkTesting.h"
+
+// Checks to see if the file exists and that it is a png file.
+// Returns 1 for a valid file and 0 for an invalid file.
+int IsFileValid(const char* fileName)
+{
+  if(vtksys::SystemTools::FileExists(fileName) == 0)
+    {
+    vtkGenericWarningMacro("Could not find file " << fileName);
+    return 0;
+    }
+  if(vtksys::SystemTools::GetFilenameLastExtension(fileName) != ".png")
+    {
+    vtkGenericWarningMacro("Wrong file type " << fileName);
+    return 0;
+    }
+  return 1;
+}
+
+int main(int argc, char* argv[])
+{
+  if(argc != 7)
+    {
+    vtkGenericWarningMacro("Must specify files to compare.");
+    vtkGenericWarningMacro(
+      "<exe> TestImage.png <Threshold> -V BaselineImage.png -T TempDirectory");
+    return 1;
+    }
+  const char* baselineImage = argv[4];
+  const char* testImage = argv[1];
+  if(IsFileValid(baselineImage) == 0 || IsFileValid(testImage) == 0)
+    {
+    return 1;
+    }
+
+  vtkSmartPointer<vtkPNGReader> reader = vtkSmartPointer<vtkPNGReader>::New();
+  reader->SetFileName(testImage);
+  reader->Update();
+
+  vtkSmartPointer<vtkTesting> testing = vtkSmartPointer<vtkTesting>::New();
+  for (int cc = 1; cc < argc; cc ++ ) 
+    { 
+    testing->AddArgument(argv[cc]);
+    }
+
+  double threshold = atof(argv[2]);
+
+  if(!testing->RegressionTest(reader, threshold))
+    {
+    return 1;
+    }
+
+  return 0;
+}