[okular] [Bug 500724] New: Cached document render gets pixelated up when display resolution changes

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=500724

            Bug ID: 500724
           Summary: Cached document render gets pixelated up when display
                    resolution changes
    Classification: Applications
           Product: okular
           Version: 24.12.1
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: kleines at filmroellchen.eu
  Target Milestone: ---

Created attachment 178865
  --> https://bugs.kde.org/attachment.cgi?id=178865&action=edit
Exhibition of scale bug; while the UI is scaled correctly, the document text is
not.

SUMMARY

When a document is pre-rendered into Okular’s document display cache, and the
display resolution changes, the document appears pixelated until a re-render
(e.g. by zooming) is enforced.

STEPS TO REPRODUCE
1. Open a document in Okular (any will do, I’ve observed it with many PDFs)
2. Change the display resolution of the screen that Okular is open on (at least
temporarily). For instance, this commonly happens automatically under KDE
Wayland when the display output turns on again after sleep mode / inactivity on
the lock screen. The behavior obviously also occurs with manual display
resolution changes, even if the resolution is reset to the old value
afterwards.
3. Observe the pixelated document.

OBSERVED RESULT

See attached image. The document is pixelated in a strange way, and this does
not go away when moving through the document. It only fixes itself after
forcing Okular to re-render the document, such as scrolling to non-cached
pages, or zooming in or out.

EXPECTED RESULT

The document should not be pixelated. Okular should probably re-render the
document if the resolution (of the window, or the whole screen) changes.

SOFTWARE/OS VERSIONS
Okular: 24.12.1
KDE Frameworks: 6.10.0
Qt: 6.8.1 wird verwendet und gebaut wurde mit 6.8.1
Arch Linux (Wayland)
Build ABI: x86_64-little_endian-lp64
Kernel: linux 6.12.9-arch1-1

ADDITIONAL INFORMATION

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