fixup python testing

93e821f5 · Mathieu Westphal (Kitware) · 104bcfaa · 93e821f5
Commit 93e821f5 authored 9 years ago by Mathieu Westphal (Kitware)
--- a/Wrapping/Python/vtk/test/Testing.py
+++ b/Wrapping/Python/vtk/test/Testing.py
@@ -255,7 +255,12 @@ def compareImage(renwin, img_fname, threshold=10):
    w2if.ReadFrontBufferOff()
    w2if.SetInput(renwin)
    w2if.Update()
-    return compareImageWithSavedImage(w2if, img_fname, threshold)
+    try:
+        compareImageWithSavedImage(w2if, img_fname, threshold)
+    except RuntimeError:
+        w2if.ReadFrontBufferOn()
+        compareImageWithSavedImage(w2if, img_fname, threshold)
+    return


 def _printCDashImageError(img_err, err_index, img_base):