Implement basic desktop app with chromium embeded framework (#2874)

* Remove tauri based desktop app

* Allow bzip-1.0.6 license

* Implement basic cef based desktop app

* Cleanup build setup

* Use wait until and execute cef loop more frequently

* Remove custom do browser work event

* Move WinitApp into its own module

* Cleanup event handling

* Cleanup + Scheudule cef message loop work

* Fix cpu overheating on idle: https://xkcd.com/1172/

* Use tracing crate for logging instead of println

* Rebase to main

---------

Co-authored-by: Dennis Kobert <dennis@kobert.dev>

desktop/src/cef/internal/browser_process_handler.rs

@@ -0,0 +1,61 @@
+use std::time::{Duration, Instant};
+
+use cef::rc::{Rc, RcImpl};
+use cef::sys::{_cef_browser_process_handler_t, cef_base_ref_counted_t, cef_browser_process_handler_t};
+use cef::{CefString, ImplBrowserProcessHandler, SchemeHandlerFactory, WrapBrowserProcessHandler};
+
+use crate::cef::CefEventHandler;
+use crate::cef::scheme_handler::{GRAPHITE_SCHEME, GraphiteSchemeHandlerFactory};
+
+pub(crate) struct BrowserProcessHandlerImpl<H: CefEventHandler> {
+	object: *mut RcImpl<cef_browser_process_handler_t, Self>,
+	event_handler: H,
+}
+impl<H: CefEventHandler> BrowserProcessHandlerImpl<H> {
+	pub(crate) fn new(event_handler: H) -> Self {
+		Self {
+			object: std::ptr::null_mut(),
+			event_handler,
+		}
+	}
+}
+
+impl<H: CefEventHandler> ImplBrowserProcessHandler for BrowserProcessHandlerImpl<H> {
+	fn on_context_initialized(&self) {
+		cef::register_scheme_handler_factory(Some(&CefString::from(GRAPHITE_SCHEME)), None, Some(&mut SchemeHandlerFactory::new(GraphiteSchemeHandlerFactory::new())));
+	}
+
+	fn get_raw(&self) -> *mut _cef_browser_process_handler_t {
+		self.object.cast()
+	}
+
+	fn on_schedule_message_pump_work(&self, delay_ms: i64) {
+		self.event_handler.schedule_cef_message_loop_work(Instant::now() + Duration::from_millis(delay_ms as u64));
+	}
+}
+
+impl<H: CefEventHandler> Clone for BrowserProcessHandlerImpl<H> {
+	fn clone(&self) -> Self {
+		unsafe {
+			let rc_impl = &mut *self.object;
+			rc_impl.interface.add_ref();
+		}
+		Self {
+			object: self.object,
+			event_handler: self.event_handler.clone(),
+		}
+	}
+}
+impl<H: CefEventHandler> Rc for BrowserProcessHandlerImpl<H> {
+	fn as_base(&self) -> &cef_base_ref_counted_t {
+		unsafe {
+			let base = &*self.object;
+			std::mem::transmute(&base.cef_object)
+		}
+	}
+}
+impl<H: CefEventHandler> WrapBrowserProcessHandler for BrowserProcessHandlerImpl<H> {
+	fn wrap_rc(&mut self, object: *mut RcImpl<_cef_browser_process_handler_t, Self>) {
+		self.object = object;
+	}
+}