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gtk: do not warn when gtk-xft-dpi is -1

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Before this change, ghostty frequently logs the following warning, even though a `gtk-xft-dpi` value of `-1` is valid and indicates default scaling.

```
warning(gtk_ghostty_surface): gtk-xft-dpi has invalid value (-1), using default
```

From [the gtk docs](https://docs.gtk.org/gtk4/property.Settings.gtk-xft-dpi.html):

> The font resolution, in 1024 * dots/inch.
>
> -1 to use the default value.
This commit is contained in:
Michael Sloan
2026-08-30 02:00:27 -06:00
parent 83c5671577
commit 3e2c0fa2db
1 changed files with 5 additions and 4 deletions
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9
src/apprt/gtk/class/surface.zig
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@@ -1572,12 +1572,13 @@ pub const Surface = extern struct {
break :xft_scale 1.0;
};
// Use a value of 1.0 for the XFT DPI scale if the setting is <= 0
// See:
// https://gitlab.gnome.org/GNOME/libadwaita/-/commit/a7738a4d269bfdf4d8d5429ca73ccdd9b2450421
// -1 specifies default scale. See:
// https://docs.gtk.org/gtk4/property.Settings.gtk-xft-dpi.html
// https://gitlab.gnome.org/GNOME/libadwaita/-/commit/9759d3fd81129608dd78116001928f2aed974ead
if (gtk_xft_dpi <= 0) {
log.warn("gtk-xft-dpi has invalid value ({}), using default", .{gtk_xft_dpi});
if (gtk_xft_dpi != -1) {
log.warn("gtk-xft-dpi has invalid value ({}), using default", .{gtk_xft_dpi});
}
break :xft_scale 1.0;
}