[Okular-devel] [okular] [Bug 360830] New: Implement high quality scaling filters for pages

[Nicolas Frattaroli via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=360830

            Bug ID: 360830
           Summary: Implement high quality scaling filters for pages
           Product: okular
           Version: unspecified
          Platform: Compiled Sources
                OS: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: kdebugs at fratti.ch

Currently, pages are scaled with what appears to be bilinear filtering. While
fast, this can often result in a blurry picture. While this isn't too much of
an issue when reading a PDF document, it can be pretty annoying when reading
small text in a CBZ that's zoomed in to fit the page width.

Examples for scaling filters can be found in mpv's documentation:
https://mpv.io/manual/stable/#video-output-drivers-bilinear

I'd suggest Mitchell-Netravali, here's a PDF of the paper I found:
www.cs.utexas.edu/users/fussell/courses/cs384g/lectures/mitchell/Mitchell.pdf

Additionally, the current bilinear interpolation should be done using GPU
accelaration if available, if this isn't already the case, for performance and
power saving purposes.

Reproducible: Always

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