Created attachment 166929 [details] Falkon browser at 150% display scale SUMMARY This happens after upgrading to KDE6. I set my monitor to 150% scale. But the web content I see in the Falkon browser seems to be zoomed badly, with text and image edges with uneven widths, as if it were zoomed using near-neighbour interpolation. STEPS TO REPRODUCE 1. Open System Settings, go to "Display & Monitor", and set "Scale" to 150% 2. Open the Falkon browser 3. Open any web page (such as the default page https://www.falkon.org/) OBSERVED RESULT See the attached screenshot. Characters are badly shaped, with unevenly thick and thin strokes. The image is also a bit blurred. EXPECTED RESULT The text should have sharp edges, and the image should not be that blurred. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.0.1 KDE Frameworks Version: 6.0.0 Qt Version: 6.6.2 Kernel Version: 6.7.9-arch1-1 (64-bit) Graphics Platform: Wayland ADDITIONAL INFORMATION If I set "Scale" to 100%, the problem disappears. This same problem also appears in the Angelfish browser. This problem does not appear in the Firefox browser (running natively as a Wayland client) even if the "Scale" is set at 150%. I am using the Plasma Wayland session. If I invoke "falkon --platform xcb" on the command line, the text looks smoother. But I am not sure whether it is aware of HiDPI and therefore renders directly at higher resolution, or it uses a smoother scaling algorithm.
I also notice similar distortion at 175% scale, so far I've only noticed within QtWebEngine views like Falkon, Konqueror, and Help Center. Looks like an upstream issue: https://bugreports.qt.io/browse/QTBUG-113574 Operating System: Arch Linux KDE Plasma Version: 6.0.1 KDE Frameworks Version: 6.0.0 Qt Version: 6.6.2 Kernel Version: 6.7.9-arch1-1 (64-bit) Graphics Platform: Wayland
(In reply to Tim Carr from comment #1) > I also notice similar distortion at 175% scale, so far I've only noticed > within QtWebEngine views like Falkon, Konqueror, and Help Center. Looks like > an upstream issue: https://bugreports.qt.io/browse/QTBUG-113574 Yes. I see the same issue with Konqueror and Help Center, too. The workaround mentioned in that link (`QT_SCALE_FACTOR_ROUNDING_POLICY=RoundPreferFloor`) works for me, too. I think it is caused by that.
*** Bug 482825 has been marked as a duplicate of this bug. ***
Created attachment 174834 [details] After upgrading to Qt 6.8.0 The attachment is what it looks like after upgrading to Qt 6.8.0 The "FALKON" logo on the top is an SVG and it is rendered perfectly. The screenshot in the middle is a PNG, and at this window size it is scaled down. I don't see any rough edges here. The text on the bottom is also rendered properly. I think the bug is fixed.
I still get issues with window title. It looks great on my 135% monitor, it looks awful on the 100% one. I am not sure it is the same issue.
Created attachment 174839 [details] Window title bar Plasma Version : 6.2.0-2 KDE Version : 24.08.2-1 Frameworks Version : 6.7.0-1 Qt6 Version : 6.8.0-1