As Jensen Harris of the Windows User Experience team alluded to in his first day session of Metro design in Windows 8, high DPI displays may soon become mainstream, some of which he has personally seen behind closed doors.
To make sure Windows 8 looks great on these displays for the desktop and slates, the system will have native scaling support for Metro-style applications to take advantage of them.
The MSDN documentation “Guidelines for scaling” clarifies that although Windows 8 will automatically scale the user interface elements, layout and images, developers and designers (mostly designers) will still have to put in some work to ensure their applications are pixel perfect even at 208 PPI and beyond.
The first, most obvious and easiest is to use vector graphics in the application. The next best actually involves some automagicness from WinRT that automatically selects the most appropriate graphics resources from a generic file & folder naming convention.
Option #1 - File naming convention: ...\foo.scale-100.jpg \foo.scale-140.jpg \foo.scale-180.jpg Option #2 - Folder naming convention: ...\scale-100\foo.jpg \scale-140\foo.jpg \scale-180\foo.jpg
Obviously some effort is involved to manage and save resources at multiple DPIs, not having to manually declare each one is a nice consideration for WinRT development.