D14308: [Exe Thumbnailer] Improve icon selection algorithm

[Stefan Brüns]

bruns added a comment.


  Criteria for a good selection algorithm:
  
  1. If there is an exact fit, use it
  2. If all candidates have the same aspect ratio, use the best fit
    - prefer slight downscaling over slight upscaling
    - prefer slight upscaling over large downscaling
  3. If aspect ratio of candidates differ, use the best fit
    - For all subsets of (approximately) same aspect ratio, (2.) should select one candidate per set
    - Determine which of the subsets yielded the best overall candidate
  
  The last point is difficult to answer - prefer upscaling a candidate with matching aspect ratio, or downscaling a nonmatching one.

REPOSITORY
  R320 KIO Extras

REVISION DETAIL
  https://phabricator.kde.org/D14308

To: broulik, #frameworks, dfaure, ngraham, pali, vonreth, antlarr
Cc: anthonyfieroni, bruns
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