D11198: [libbreezecommon] add box shadow helper

[Vlad Zagorodniy]

zzag updated this revision to Diff 31846.
zzag added a comment.


  Because this patch hasn't been landed yet, I would like to post here
  my recent work on optimizing the box shadow helper...
  
  Summary of changes:
  
  - re-write naive blur helper
  - modify only alpha channel in blur helpers
  - reserve memory for kernel in computeGaussianKernel
  
  See, benchmark results https://docs.google.com/spreadsheets/d/1ykAUyspF6BgCFb_U7-muLDEYzrOTNiT5CvFgqCU2xTs/edit?usp=sharing

REPOSITORY
  R31 Breeze

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D11198?vs=31808&id=31846

BRANCH
  refine-shadows-libbreezecommon

REVISION DETAIL
  https://phabricator.kde.org/D11198

AFFECTED FILES
  CMakeLists.txt
  cmake/Modules/FindFFTW.cmake
  kstyle/CMakeLists.txt
  libbreezecommon/CMakeLists.txt
  libbreezecommon/breezeboxshadowhelper.cpp
  libbreezecommon/breezeboxshadowhelper.h
  libbreezecommon/config-breezecommon.h.cmake

To: zzag, #breeze, #vdg, hpereiradacosta
Cc: broulik, abetts, plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, sebas, apol, mart
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