Translations:HiDPI support/12/en


 * In all appropriate places, get system font metrics to determine the size of a widget.
 * In places where real size is referenced, assume font size as a relative measure (72 points = 96 virtual pixels = 1 inch).
 * Choose a reference device relative to which UI could scale up and down.
 * 2D coordinates and sizes should assume device-independent pixels.
 * Make sure qreal versions of APIs are used.
 * Turn off AA_EnableHighDpiScaling