D23256: Sample the fits viewer's histogram calculation

[Hy Murveit]

murveit created this revision.
Herald added a project: KDE Edu.
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REVISION SUMMARY
  Fitshistogram previously uses all samples in an image to caculate its
  frequency statistics for histogram and statistics displays. This can
  take a significant amount of time, and the precision is unnecessary.
  With this change, image pixels are sampled when their frequencies are
  computed, limited to under 2 million samples. This significantly
  speeds up the capture of images when fitsviewer is displaying
  statistics or histograms and there are millions of pixels in an image.

REPOSITORY
  R321 KStars

BRANCH
  sampling-in-fitshistogram (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D23256

AFFECTED FILES
  kstars/fitsviewer/fitshistogram.cpp

To: murveit
Cc: kde-edu, narvaez, apol
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