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PERF: Improve FunctorImageFilter performances

Merged PERF: Improve FunctorImageFilter performances
lhermitte/otb:line_progress into develop
Merged Luc Hermitte requested to merge lhermitte/otb:line_progress into develop
  1. Mar 08, 2019
    • Luc Hermitte's avatar
      PERF: Improve FunctorImageFilter performances · 52fdb672
      Luc Hermitte authored 
      `itk::UnaryFunctorImageFilter` only updates the progress reporter once per
line.
This commit mimics that behaviour.

The performance improvment is small, less than 10% on simple filters like a
scaling filter that multiplies pixel values.
      52fdb672