Bug 436086

Summary:	PNG image in CBZ wrapper does not display correctly (but PNG itself does)
Product:	[Applications] okular	Reporter:	Gaëtan Gilbert <gaetan.gilbert>
Component:	Comicbook backend	Assignee:	Okular developers <okular-devel>
Status:	RESOLVED FIXED
Severity:	normal	CC:	aacid, nate
Priority:	NOR
Version First Reported In:	20.12.3
Target Milestone:	---
Platform:	Debian testing
OS:	Linux
Latest Commit:	https://invent.kde.org/graphics/okular/commit/f31152d389fc5ce348f836c749d66e71a66f3949	Version Fixed/Implemented In:	21.04.2
Sentry Crash Report:

Description Gaëtan Gilbert 2021-04-23 09:19:07 UTC

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.

Comment 1 Bug Janitor Service 2021-05-12 20:53:03 UTC

A possibly relevant merge request was started @ https://invent.kde.org/graphics/okular/-/merge_requests/424

Comment 2 Albert Astals Cid 2021-05-12 22:29:38 UTC

Git commit f31152d389fc5ce348f836c749d66e71a66f3949 by Albert Astals Cid.
Committed on 12/05/2021 at 20:52.
Pushed by aacid into branch 'release/21.04'.

Fix loading some png files inside zip comicbook files

M  +9    -1    generators/comicbook/document.cpp

https://invent.kde.org/graphics/okular/commit/f31152d389fc5ce348f836c749d66e71a66f3949