Add OpenHarmony support to servoshell (#32594)

* Generate EGL bindings for ohos

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Adjust servoshell `bin` error message for android/ohos

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* ohos: disable WebGL

offscreen buffers are not implemented yet on ohos.

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Add OpenHarmony support to servoshell

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Share ResourceReaderInstance

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Share android/ohos HostTrait

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Share servo glue

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>
Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>

* Pass Init options from ArkTS to Servo

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* f rebase ResourceReaderMethods

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* fixup! Share ResourceReaderInstance

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Fix typo

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Update Cargo.lock

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* ohos: Move WebGL check to webgl thread

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Remove commented code

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Remove commented and duplicate / unused code

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

---------

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>
Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>

ports/servoshell/egl/ohos/simpleservo.rs

@@ -0,0 +1,110 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+use std::cell::RefCell;
+use std::convert::TryInto;
+use std::os::raw::c_void;
+use std::path::PathBuf;
+use std::rc::Rc;
+
+use log::{debug, error, info};
+use ohos_sys::ace::xcomponent::native_interface_xcomponent::{
+    OH_NativeXComponent, OH_NativeXComponent_GetXComponentSize,
+};
+use servo::compositing::windowing::EmbedderEvent;
+use servo::compositing::CompositeTarget;
+use servo::embedder_traits::resources;
+/// The EventLoopWaker::wake function will be called from any thread.
+/// It will be called to notify embedder that some events are available,
+/// and that perform_updates need to be called
+pub use servo::embedder_traits::EventLoopWaker;
+use servo::euclid::Size2D;
+use servo::servo_url::ServoUrl;
+use servo::webrender_traits::RenderingContext;
+use servo::{self, gl, Servo};
+use surfman::{Connection, SurfaceType};
+
+use crate::egl::host_trait::HostTrait;
+use crate::egl::ohos::InitOpts;
+use crate::egl::resources::ResourceReaderInstance;
+use crate::egl::servo_glue::{
+    Coordinates, ServoEmbedderCallbacks, ServoGlue, ServoWindowCallbacks,
+};
+
+/// Initialize Servo. At that point, we need a valid GL context.
+/// In the future, this will be done in multiple steps.
+pub fn init(
+    options: InitOpts,
+    native_window: *mut c_void,
+    xcomponent: *mut OH_NativeXComponent,
+    gl: Rc<dyn gl::Gl>,
+    waker: Box<dyn EventLoopWaker>,
+    callbacks: Box<dyn HostTrait>,
+) -> Result<ServoGlue, &'static str> {
+    info!("Entered simpleservo init function");
+    resources::set(Box::new(ResourceReaderInstance::new()));
+
+    gl.clear_color(1.0, 1.0, 1.0, 1.0);
+    gl.clear(gl::COLOR_BUFFER_BIT);
+    gl.finish();
+
+    // Initialize surfman
+    let connection = Connection::new().or(Err("Failed to create connection"))?;
+    let adapter = connection
+        .create_adapter()
+        .or(Err("Failed to create adapter"))?;
+
+    let mut width: u64 = 0;
+    let mut height: u64 = 0;
+    let res = unsafe {
+        OH_NativeXComponent_GetXComponentSize(
+            xcomponent,
+            native_window,
+            &mut width as *mut _,
+            &mut height as *mut _,
+        )
+    };
+    assert_eq!(res, 0, "OH_NativeXComponent_GetXComponentSize failed");
+    let width: i32 = width.try_into().expect("Width too large");
+    let height: i32 = height.try_into().expect("Height too large");
+
+    debug!("Creating surfman widget with width {width} and height {height}");
+    let native_widget = unsafe {
+        connection.create_native_widget_from_ptr(native_window, Size2D::new(width, height))
+    };
+    let surface_type = SurfaceType::Widget { native_widget };
+
+    info!("Creating rendering context");
+    let rendering_context = RenderingContext::create(&connection, &adapter, surface_type)
+        .or(Err("Failed to create surface manager"))?;
+
+    info!("before ServoWindowCallbacks...");
+
+    let window_callbacks = Rc::new(ServoWindowCallbacks::new(
+        callbacks,
+        RefCell::new(Coordinates::new(0, 0, width, height, width, height)),
+        options.display_density as f32,
+        rendering_context.clone(),
+    ));
+
+    let embedder_callbacks = Box::new(ServoEmbedderCallbacks::new(waker, None, gl.clone()));
+
+    let servo = Servo::new(
+        embedder_callbacks,
+        window_callbacks.clone(),
+        // User agent: Mozilla/5.0 (<Phone|PC|Tablet>; HarmonyOS 5.0) bla bla
+        None,
+        CompositeTarget::Window,
+    );
+
+    let mut servo_glue = ServoGlue::new(rendering_context, servo.servo, window_callbacks);
+
+    let initial_url = ServoUrl::parse(options.url.as_str())
+        .inspect_err(|e| error!("Invalid initial Servo URL `{}`. Error: {e:?}", options.url))
+        .ok()
+        .unwrap_or_else(|| ServoUrl::parse("about:blank").expect("Infallible"));
+
+    let _ = servo_glue.process_event(EmbedderEvent::NewWebView(initial_url, servo.browser_id));
+
+    Ok(servo_glue)
+}