Poor UI font rendering on Windows

[kittybwained]

I just installed GNAT Studio 25 but I've noticed that all the text looks very strange.

All the text looks slightly green, and the kerning is really off in places (see: the settings window title bar, the text "Adwaita" on the theme options drop down, the text "Custom Styles" in the settings menu bar, etc.). Interestingly, the actual editor code view looks mostly fine.

I'm running GNAT Studio 25 on Windows 11 IoT Enterprise LTSC 24H2 (build 26100.2605). My best guess as to what could be causing this is maybe GTK3 not doing font rendering properly on Windows for some reason, as all my other programs look fine, including a GTK 4.16.2 program.

P.S.: when viewing these screenshots in Chromium, please open them in a new tab and click on them to show it at actual size, as otherwise the image scaling somewhat masks the issues.

[kittybwained]

I tried playing with the settings in C:\GNATSTUDIO\etc\gtk-3.0 and C:\GNATSTUDIO\etc\fonts, setting subpixel antialiasing to RGB, BGR, Greyscale, changing the hinting level, but no matter what I change it always looks the same somehow.

[kittybwained]

I've found a workaround. It seems that this is a result of pango/cairo's win32 backend being broken. Setting the environment variable PANGOCAIRO_BACKEND to fc fixes it. It would be nice if this could be incorporated into GNAT Studio in some way, where on Windows it could choose the fc backend over win32.

[AnthonyLeonardoGracio]

Hello @kittybwained,

Thanks for the workaround! We'll see how we can set the pango backend to fc by default then.

Regards,