Qt High DPI

Http://doc.qt.io/qt-5/highdpi.html

Qt Support

• Ability to provide pixmaps or artwork for high Resolution:see Drawing High resolution Versions of Pixmaps and Images.
• Qt 5.4 introduces experimental support for scaling by-device pixel ratio similar to OS X to the platform plugins for Wi Ndows and Unix (XCB). This was controlled by the environment variable QT_DEVICE_PIXEL_RATIO . It can be set to a numerical value to being used as scale factor or "auto" which causes the scale factor to being determined by C Hecking the monitor size.

  It's recommended to use the Fusion style.

Migration of Existing applications

In order to get the application designed for low DPI values running on a high resolution monitors quickly, consider one of The scaling options (let the application run as DPI unaware on Windows or set the environment variable to QT_DEVICE_PIXEL_RATIO c2/>. These options may incur some scaling or painting artifacts, though.

In the longer term, the application should is adapted to run unmodified:

• Always use the qreal versions of the Qpainter drawing API.
• Size windows and dialogs in relation to the screen size.
• Replace hard-coded sizes in layouts and drawing code by values calculated from font metrics or screen size.

Qt High DPI