Bug 439663

Summary:	[Feature Request] Necessity of a performant and true-rendering epub backend
Product:	[Applications] okular	Reporter:	Chromer <downloader030>
Component:	EPub backend	Assignee:	Okular developers <okular-devel>
Status:	REPORTED ---
Severity:	wishlist	CC:	aacid
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Chromer 2021-07-09 06:32:51 UTC

SUMMARY
Okular like usual document readers is not that good at rendering epub files, currently Foliate is the best linux app in true and usable rendering of epub files because of doing it with webkit and epub.js library.
Currently epub files with size of + 10 MB are impossible to load in okular, and will make the app freeze and need to kill, very light and simple epubs also are not easy and pleasant to read in okular.
As qt5-webengine is a mandatory dependency of Plasma , okular needs a epub backend based on webengine and epub.js just like what foliate does in this way.

STEPS TO REPRODUCE
1. Open a epub in okular
2. You will never have a good experience when reading it on okular
3. Nothing will rendered properly and as it should be

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS 
Linux : Arch Linux
KDE Plasma Version: 5.22.3
KDE Frameworks Version: 5.83
Qt Version: 5.15.2 KDE 

ADDITIONAL INFORMATION