D4963: Add scaling support into BlurEffect::doBlur

[Fredrik Höglund]

fredrik added a comment.


  The blur shader is not designed to blur and scale simultaneously.
  
  The sampled offsets are computed so that the shader samples between pixels, and the kernel weights are the sums of the gaussian function for the interpolated pixel values at each offset.
  
  This only works when the source and destinations have the same scale.

REVISION DETAIL
  https://phabricator.kde.org/D4963

To: davidedmundson, #plasma
Cc: fredrik, plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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