https://bugs.kde.org/show_bug.cgi?id=373178
--- Comment #30 from younker...@gmail.com <younky.y...@yahoo.com> --- (In reply to Henrik Fehlauer from comment #27) > Thanks for the screenshots, here is what's happening: > > You are setting a scale factor in the KScreen KCM, which results in > modifying the font DPI as well as setting some environment variables for Qt > apps (see https://doc.qt.io/qt-5/highdpi.html). > > For Gwenview this means due to the change in DPI you will get larger fonts, > and due the other environment variables and > "app.setAttribute(Qt::AA_UseHighDpiPixmaps, true);" in main.cpp, Qt will be > scaling up everything else, e.g. the border of buttons is doubled in width > for 2x scaling. Pixmaps are also scaled by default, but application code can > opt out of this behaviour by providing a custom higher resolution pixmap > itself. This is done by library code for the toolbar icons, but still > missing for Gwenview's image canvas. That's what the Diffs in Comment 17 are > about. > > As 2x is integer scaling and not fractional scaling (e.g. 1.4x), you'll > hardly see any "blurriness". However, what you can see, even in your > screenshot, is some sort of blockiness. To demonstrate this, I took your > screenshots (note that both are with 100% zoom level set in Gwenview!) and > magnified them a bit: > > https://phabricator.kde.org/F5823449 > > You can clearly see that the "pixel" size for the 2x version of the blue > image on the bottom is doubled compared to the 1x version above, i.e. it is > wrong. > > > I think Gwenview could ignore Screen scaling factor > That would be too simple and break the UI. We only need to do some changes > for certain pixmaps, see the patch for details. > > TL;DR: No, the problem has not been solved magically ;) Let us know if > anyone wants to help, because currently the authors of both patches seem to > be occupied with other things, so progress is quite slow… Just wonder on the progress of this one. As an image viewer application, showing the image correctly on hidpi display is the basic functions. I known AlienSkin software use QT, and it doesn't have such issues on both Windows and Mac, I believe we should also fix this for Gwenview and Digikam as what we need to do is to ignore the scale factors for displying the image. -- You are receiving this mail because: You are watching all bug changes.
