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Windows: Image _scaler engine performance regression  #23

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@PierreRaybaut

Description

@PierreRaybaut

This issue concerns the image C++ scaling engine.
The anti-aliasing feature is very slow on recent builds of PlotPy.

This affects:

  • PlotPy V2
  • The latest version of guiqwt in which no change has been made to the scaling engine for a long time

This does not affect:

  • OS other than Windows (e.g. Linux)
  • Older builds of guiqwt based on Visual Studio 2008

This has been identified as a regression due to the compiler itself (MSVC).
Changes need to be made to optimize the compilation.

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