[okular] [Bug 436086] New: PNG image in CBZ wrapper does not display correctly (but PNG itself does)

[Gaëtan Gilbert]

https://bugs.kde.org/show_bug.cgi?id=436086

            Bug ID: 436086
           Summary: PNG image in CBZ wrapper does not display correctly
                    (but PNG itself does)
           Product: okular
           Version: 20.12.3
          Platform: Debian testing
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Comicbook backend
          Assignee: okular-devel at kde.org
          Reporter: gaetan.gilbert at skyskimmer.net
  Target Milestone: ---

The files attached at https://bugs.kde.org/show_bug.cgi?id=307080 do not work
for me with okular 20.12.3 (debian testing, KDE frameworks 5.78.0, Qt 5.15.2,
libpng 1.6.37-3)

Both attached cbz display the okular icon and output on stderr:

libpng warning: zTXt: CRC error
libpng error: PNG unsigned integer out of range
QImage::scaled: Image is a null image
libpng warning: zTXt: CRC error
libpng error: PNG unsigned integer out of range
QImage::scaled: Image is a null image
libpng warning: zTXt: CRC error
libpng error: PNG unsigned integer out of range
QImage::scaled: Image is a null image
libpng warning: zTXt: CRC error
libpng error: PNG unsigned integer out of range
QImage::scaled: Image is a null image

(the same thing for both files, on files without buggy images nothing is
printed)

Opening the images directly without the cbz wrapper works fine.

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