https://bugs.kde.org/show_bug.cgi?id=362856
--- Comment #11 from Yi Yang <ahyan...@gmail.com> --- By reading more documents and doing more experiments, things are now clear. Qt 5.6 introduces a new option, called "High DPI Scaling", which is both controllable form environment variables and application-wise options (Qt::AA_EnableHighDpiScaling and Qt::AA_DisbleHighDpiScaling). This gives us solution A: temporarily force Qt::AA_DisbleHighDpiScaling. This solution does uglify menus and icons, though. The more complex solution B needs more code refactoring. The key is to realize that you are using "device-independent geometry" while the pixmap inside QPixmap are using real physical values. You need to get this magical value from QScreen::devicePixelRatio() and set them to QPixmap::setDevicePixelRatio(). This step might be simplified by "Qt::AA_UseHighDpiPixmaps". I'm not sure, the documentation here isn't clear. But the even harder part is you need to rewrite the image rotation and cropping code, since now you are cropping the image to (widget size * devicePixelRatio()). It's a bit tricky and many code in different locations made the assumption that widget size = the pixmap size in it, which no longer holds and thus broken code is scattered everywhere. -- You are receiving this mail because: You are watching all bug changes.
