Desktop: Have CEF use Wayland if available (#2945)

tell cef to use wayland if available

Co-authored-by: Keavon Chambers <[email protected]>

Author: timon-schelling

desktop/src/cef/internal/app.rs

@@ -1,3 +1,5 @@
+use std::env;
+
 use cef::rc::{Rc, RcImpl};
 use cef::sys::{_cef_app_t, cef_base_ref_counted_t};
 use cef::{BrowserProcessHandler, CefString, ImplApp, ImplCommandLine, SchemeRegistrar, WrapApp};
@@ -34,6 +36,20 @@ impl<H: CefEventHandler + Clone> ImplApp for AppImpl<H> {
 			// Disable GPU acceleration, because it is not supported for Offscreen Rendering and can cause crashes.
 			cmd.append_switch(Some(&CefString::from("disable-gpu")));
 			cmd.append_switch(Some(&CefString::from("disable-gpu-compositing")));
+
+			// Tell CEF to use Wayland if available
+			#[cfg(not(any(target_os = "macos", target_os = "windows")))]
+			{
+				let use_wayland = env::var("WAYLAND_DISPLAY")
+					.ok()
+					.filter(|var| !var.is_empty())
+					.or_else(|| env::var("WAYLAND_SOCKET").ok())
+					.filter(|var| !var.is_empty())
+					.is_some();
+				if use_wayland {
+					cmd.append_switch_with_value(Some(&CefString::from("ozone-platform")), Some(&CefString::from("wayland")));
+				}
+			}
 		}
 	}