Why Does My DPI-Unaware Application Suddenly Exhibit UI Distortion After Updating to System Aware?

DPI Awareness: Windows Bitmap Scaling (6.0) vs. System Aware (6.1)

This case study examines an application initially designed as DPI-Unaware, relying on Windows bitmap scaling for high-DPI displays. An update to version 6.1 unexpectedly changed its DPI awareness to System Aware, resulting in UI distortion.

Troubleshooting the Issue

The root cause is a newly included third-party component in the updated version. Despite the application's inherent DPI-Unawareness, the third-party component introduced DPI awareness.

Managing DPI Awareness

DPI awareness can be explicitly controlled within the application manifest:

<code class="language-xml"><application>
  <windowsSettings>
    <dpiAware>false</dpiAware>
  </windowsSettings>
</application></code>

Alternatively, Windows APIs offer programmatic control:

<code class="language-csharp">SetProcessDPIAware();
GetAwarenessFromDpiAwarenessContext(GetWindowDpiAwarenessContext(hWnd));</code>

Solution

To revert to DPI-Unawareness, add <dpiAware>false</dpiAware> to the application manifest. If a third-party component forces DPI awareness, consider adding System.Windows.Media.DisableDpiAwareness to AssemblyInfo.cs to override the unwanted behavior.

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