In general the gesture works, but after the gesture is finished, the view seems to still use a "nearest" filter instead of doing a rerendering at the final zoom level. When entering the same zoom level in the input box, the rendering has the same size, but is sharp and crisp. When scrolling, the rendering also becomes clean.
I am not sure whether I understand what you mean. Can you maybe post a screencast of what you are doing?
When I zoom in using Ctrl + Mouse Wheel Up, the page contents are magnified immediately, but for a very short time the contents are "blocky". This is not persistent, but the contents are immediately rerendered with the higher resolution. This is the expected behaviour. When I use a pinch zoom gesture, the last step - rerendering at current resolution - is omitted. As soon as I move the page around (cursor keys, mouse, touch), the contents are rerendered. I have tried to create two screenshots - the left half shows the jaggy edges immediately after zooming, the right half after pressing cursor down.
Created attachment 110828 [details] Screenshot
Okay, now I understand. However, I cannot reproduce the problem. Does anybody have an idea?
I also cannot reproduce using Okular from git master or 17.12.x. The blockiness disappears as soon as I let my fingers go, as expected At this point, it would be helpful to know what version of Okular you're using. And for future reference, please see https://community.kde.org/Get_Involved/Bug_Reporting#Software_versions
KDE Frameworks 5.43.0 Qt 5.10.0 (built against 5.10.0) The xcb windowing system
It is sometimes hard to see the misrendering, and it does not happen all the time, or it is immediately cleared, because on lifting the finger a small movement happens.
Out of curiosity, does this reproduce when using Okular in KDE Plasma, under KWin? Or only in your XCB environment?
Thats the info as printed in the Okular About/Libraries tab, so this *is* a regular Plasma5/Kwin/X11 session.
Hah! Thanks for the confirmation.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!