[dolphin] [Bug 483560] New: Dolphin Does Not Display Thumbnails for JXL Wide Gamut Photos

[John]

https://bugs.kde.org/show_bug.cgi?id=483560

            Bug ID: 483560
           Summary: Dolphin Does Not Display Thumbnails for JXL Wide Gamut
                    Photos
    Classification: Applications
           Product: dolphin
           Version: 24.02.0
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: view-engine: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: kdelovaa at mozej.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 167172
  --> https://bugs.kde.org/attachment.cgi?id=167172&action=edit
Wide Gamut JXL Photo (P3).

SUMMARY
***
Test photo from webkit/blink devs and joint picture expert group reveals that
Dolphin is missing support for JXL wide gamut (e.g. created by few latests
generations of android and apple phones fo some time now). Thumbnail is not
displayed at all for this so called P3 photo. No problem in nsxiv.
***


STEPS TO REPRODUCE
1. Get the attatched photo
2. Open Dolphin
3. No Thumbnail at all.

OBSERVED RESULT
No thumbnail for jxl wide gamut photo. Thumbnail should also display webkit
logo. If there's red if you fix, but there's no logo then you failed to support
wide gamut. In thumbnail there should be a webkit logo on red background. No
logo=no support. Here not even red background.

EXPECTED RESULT
Fix the support for google/android and apple phones and their photos (wide
gamut jxl). Webikit logo on Red should be visible. If there is no logo, then
there's no support. NO LOGO=NO SUPPORT.

SOFTWARE/OS VERSIONS:
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Graphics Platform: X11
Graphics Processor: Intel Only

ADDITIONAL INFORMATION:
$ pacman Qs 'xxxx':
kdesdk-thumbnailers 24.02
kdegraphics-thumbnailers 24.02
ffmpegthumbs 24.02
qt6-imageformats 6.6.2
kimageformats 6.0.0
libpng 1.6.43
libavif 1.0.4
libheif 1.17.6
libwebp 1.3.2
webp-pixbuf-loader 0.2.7

P.S. Gwenview displays thumbnails correctly. There is red background and webkit
logo on it. Gwenview cannot display this photo. It displays only red
background, but no logo, hence fail.

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