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Wayland: Workaround API limitation in screen/UI scale logic

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Mainly, this fixes auto UI scaling with _single-monitor_ fractional
setups (see the comment in `display_server_wayland.cpp` for more info).

This is the result of a bunch of current limitations, mainly the fact
that the UI scale is static (it's probed at startup) and the fact that
Wayland exposes fractional scales only at the window-level, by design.

The `screen_get_scale` special case should help in 99% of cases, while
the auto UI scale part will unfortunately only help with single-screen
situations, as multi-screen fractional scaling requires dynamic UI
scale changing.
This commit is contained in:
Riteo
2024-03-16 14:48:11 +01:00
parent d8aa2c65a9
commit 1bb8199342
3 changed files with 25 additions and 3 deletions
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13
editor/editor_settings.cpp
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@@ -1540,6 +1540,19 @@ String EditorSettings::get_editor_layouts_config() const {
float EditorSettings::get_auto_display_scale() const {
#ifdef LINUXBSD_ENABLED
if (DisplayServer::get_singleton()->get_name() == "Wayland") {
float main_window_scale = DisplayServer::get_singleton()->screen_get_scale(DisplayServer::SCREEN_OF_MAIN_WINDOW);
if (DisplayServer::get_singleton()->get_screen_count() == 1 || Math::fract(main_window_scale) != 0) {
// If we have a single screen or the screen of the window is fractional, all
// bets are off. At this point, let's just return the current's window scale,
// which is special-cased to the scale of `SCREEN_OF_MAIN_WINDOW`.
return main_window_scale;
}
// If the above branch didn't fire, fractional scaling isn't going to work
// properly anyways (we're need the ability to change the UI scale at runtime).
// At this point it's more convenient to "supersample" like we do with other
// platforms, hoping that the user is only using integer-scaled screens.
return DisplayServer::get_singleton()->screen_get_max_scale();
}
#endif