Alexander Halser from EC Software GmbH. has released an in-depth how to guide for preparing your Delphi VCL applications to support 4K displays. The guide talks about what the standard DPI in your Windows applications is usually set to (96 DPI), which versions of Windows support various DPI virtualization techniques, and changes you can make to your application manifest to make it DPI aware. Lastly it provides some source code in the form of a Windows message handler for scaling your application at runtime. There is a demo application included with the PDF how-to guide which you can test out and then implement yourself in your own applications. Specifically the guide discusses:
- Dots per Inch (DPI) explained
- Windows and DPI, Delphi and DPI
- Testing high resolutions
- DPI virtualization in Windows
- Windows 8.1 multi-montor DPI scaling
- Declaring DPI-awareness in Delphi
- Flipping DPI at runtime on Windows 8.1
