GDI Scaling not working properly

[Christian]

Hello,

I'm using Windows 10 1709 and I have a FHD display on which I set scaling to 125%.

When using GDI scaling in my C# application using CefSharp 69.0.0, I get a weird rendering as can be seen in the following image. It's based on the CefSharp.MinimalExample.WinForms application.

cef.png (82.71 KiB) Viewed 5225 times

I have enabled GDI scaling using the following lines in my app.manifest.

Code: Select all

<asmv3:application>
    <asmv3:windowsSettings>
        <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</dpiAware>
        <gdiScaling xmlns="http://schemas.microsoft.com/SMI/2017/WindowsSettings">true</gdiScaling>
    </asmv3:windowsSettings>
</asmv3:application>


I'm also calling the following code.

Code: Select all

Cef.EnableHighDPISupport();
...
Cef.Initialize(settings, true, null);


When using a display scaling of 100% everything looks normal. Does anyone have an idea why this happens? Thank you!

[amaitland]

GDI scaling maybe incompatible with Chromium.

How does the latest unmodified version of the Minimum Example behave on your machine?

https://github.com/cefsharp/CefSharp.MinimalExample

Also test with a newer version of Windows, might be something they fixed.

In future please ask your question on https://stackoverflow.com/questions/tagged/cefsharp as it's not directly related to CEF.

[Christian]

Thank you for the fast reply.

We tested the WinForms project of the CefSharp.MinimalExample with the latest Chrome 72.0.3626.109 (64-Bit) on both Windows 1709 and the latest Windows 1809 and we get the same kind of rendering distortion when scaling the display to 125% and using GDI scaling.

For now we simple won't use GDI scaling and hope that a future update will enable us to use it in our application.
Thank you!

[amaitland]

You can force chromium to disable scaling.

See https://github.com/cefsharp/CefSharp/wi ... ayssupport