Smooth Scaling Algorithm

Normal smoothscale method, based on Imlib2's smoothscale.

Used in Qt Gui (QImage::transformed() functions).

The sources can be found in qt-everywhere-src-5.15.2/qtbase/src/gui/painting/qimagescale.cpp.

 Copyright (C) 2004, 2005 Daniel M. Duley.
     (C) Carsten Haitzler and various contributors.
     (C) Willem Monsuwe <willem@stack.nl>

BSD 2-clause "Simplified" License and Imlib2 License.

 qimagetransform.cpp was contributed by Daniel M. Duley based on code from Imlib2.

 Copyright (C) 2004, 2005 Daniel M. Duley

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