ohos: Support resizing the surface (#35158)

A window resize requires to also resize the webview,
otherwise it will stay at the original size.

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

3 files changed, 85 insertions, 30 deletions

diff --git a/ports/servoshell/egl/ohos.rs b/ports/servoshell/egl/ohos.rs
index 66e568972b0..908a4c75240 100644
--- a/ports/servoshell/egl/ohos.rs
+++ b/ports/servoshell/egl/ohos.rs
@@ -26,14 +26,14 @@ use simpleservo::EventLoopWaker;
 use xcomponent_sys::{
     OH_NativeXComponent, OH_NativeXComponent_Callback, OH_NativeXComponent_GetKeyEvent,
     OH_NativeXComponent_GetKeyEventAction, OH_NativeXComponent_GetKeyEventCode,
-    OH_NativeXComponent_GetTouchEvent, OH_NativeXComponent_KeyAction, OH_NativeXComponent_KeyCode,
-    OH_NativeXComponent_KeyEvent, OH_NativeXComponent_RegisterCallback,
-    OH_NativeXComponent_RegisterKeyEventCallback, OH_NativeXComponent_TouchEvent,
-    OH_NativeXComponent_TouchEventType,
+    OH_NativeXComponent_GetTouchEvent, OH_NativeXComponent_GetXComponentSize,
+    OH_NativeXComponent_KeyAction, OH_NativeXComponent_KeyCode, OH_NativeXComponent_KeyEvent,
+    OH_NativeXComponent_RegisterCallback, OH_NativeXComponent_RegisterKeyEventCallback,
+    OH_NativeXComponent_TouchEvent, OH_NativeXComponent_TouchEventType,
 };
 
 use super::host_trait::HostTrait;
-use super::servo_glue::ServoGlue;
+use super::servo_glue::{Coordinates, ServoGlue};
 
 mod resources;
 mod simpleservo;
@@ -104,6 +104,10 @@ pub(super) enum ServoAction {
     ImeSendEnter,
     Initialize(Box<InitOpts>),
     Vsync,
+    Resize {
+        width: i32,
+        height: i32,
+    },
 }
 
 /// Queue length for the thread-safe function to submit URL updates to ArkTS
@@ -180,6 +184,9 @@ impl ServoAction {
                 servo.notify_vsync();
                 servo.present_if_needed();
             },
+            Resize { width, height } => {
+                servo.resize(Coordinates::new(0, 0, *width, *height, *width, *height))
+            },
         };
     }
 }
@@ -263,9 +270,52 @@ extern "C" fn on_surface_created_cb(xcomponent: *mut OH_NativeXComponent, window
     info!("Returning from on_surface_created_cb");
 }
 
-// Todo: Probably we need to block here, until the main thread has processed the change.
-extern "C" fn on_surface_changed_cb(_component: *mut OH_NativeXComponent, _window: *mut c_void) {
-    error!("on_surface_changed_cb is currently not implemented!");
+/// Returns the size of the surface
+///
+/// # Safety
+///
+/// `xcomponent` and `native_window` must be valid, non-null and aligned pointers to a
+/// live xcomponent and associated native window surface.
+unsafe fn get_xcomponent_size(
+    xcomponent: *mut OH_NativeXComponent,
+    native_window: *mut c_void,
+) -> Result<euclid::default::Size2D<i32>, i32> {
+    let mut width: u64 = 0;
+    let mut height: u64 = 0;
+    let result = unsafe {
+        OH_NativeXComponent_GetXComponentSize(
+            xcomponent,
+            native_window,
+            &raw mut width,
+            &raw mut height,
+        )
+    };
+    if result != 0 {
+        debug!("OH_NativeXComponent_GetXComponentSize failed with {result}");
+        return Err(result);
+    }
+
+    let width: i32 = width.try_into().expect("Width too large");
+    let height: i32 = height.try_into().expect("Height too large");
+    Ok(euclid::Size2D::new(width, height))
+}
+
+extern "C" fn on_surface_changed_cb(
+    xcomponent: *mut OH_NativeXComponent,
+    native_window: *mut c_void,
+) {
+    debug!("on_surface_changed_cb: xc: {xcomponent:?}, window: {native_window:?}");
+    // SAFETY: We just obtained these pointers from the callback, so we can assume them to be valid.
+    if let Ok(size) = unsafe { get_xcomponent_size(xcomponent, native_window) } {
+        info!("on_surface_changed_cb: Resizing to {size:?}");
+        call(ServoAction::Resize {
+            width: size.width,
+            height: size.height,
+        })
+        .unwrap();
+    } else {
+        error!("on_surface_changed_cb: Surface changed, but failed to obtain new size")
+    }
 }
 
 extern "C" fn on_surface_destroyed_cb(_component: *mut OH_NativeXComponent, _window: *mut c_void) {
diff --git a/ports/servoshell/egl/ohos/simpleservo.rs b/ports/servoshell/egl/ohos/simpleservo.rs
index 3498531a949..ff0a37c6105 100644
--- a/ports/servoshell/egl/ohos/simpleservo.rs
+++ b/ports/servoshell/egl/ohos/simpleservo.rs
@@ -9,7 +9,6 @@ use std::rc::Rc;
 
 use log::{debug, info};
 use servo::compositing::CompositeTarget;
-use servo::euclid::Size2D;
 use servo::webrender_traits::SurfmanRenderingContext;
 /// The EventLoopWaker::wake function will be called from any thread.
 /// It will be called to notify embedder that some events are available,
@@ -17,7 +16,7 @@ use servo::webrender_traits::SurfmanRenderingContext;
 pub use servo::EventLoopWaker;
 use servo::{self, resources, Servo};
 use surfman::{Connection, SurfaceType};
-use xcomponent_sys::{OH_NativeXComponent, OH_NativeXComponent_GetXComponentSize};
+use xcomponent_sys::OH_NativeXComponent;
 
 use crate::egl::host_trait::HostTrait;
 use crate::egl::ohos::resources::ResourceReaderInstance;
@@ -68,24 +67,13 @@ pub fn init(
         .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 _,
-        )
+    let Ok(window_size) = (unsafe { super::get_xcomponent_size(xcomponent, native_window) }) else {
+        return Err("Failed to get xcomponent size");
     };
-    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))
-    };
+    debug!("Creating surfman widget with {window_size:?}");
+    let native_widget =
+        unsafe { connection.create_native_widget_from_ptr(native_window, window_size) };
     let surface_type = SurfaceType::Widget { native_widget };
 
     info!("Creating rendering context");
@@ -102,7 +90,14 @@ pub fn init(
 
     let window_callbacks = Rc::new(ServoWindowCallbacks::new(
         callbacks,
-        RefCell::new(Coordinates::new(0, 0, width, height, width, height)),
+        RefCell::new(Coordinates::new(
+            0,
+            0,
+            window_size.width,
+            window_size.height,
+            window_size.width,
+            window_size.height,
+        )),
         options.display_density as f32,
     ));
 
diff --git a/ports/servoshell/egl/servo_glue.rs b/ports/servoshell/egl/servo_glue.rs
index 0a12bd9c713..f485ed56b9c 100644
--- a/ports/servoshell/egl/servo_glue.rs
+++ b/ports/servoshell/egl/servo_glue.rs
@@ -15,7 +15,7 @@ use servo::compositing::windowing::{
 };
 use servo::euclid::{Box2D, Point2D, Rect, Scale, Size2D, Vector2D};
 use servo::servo_geometry::DeviceIndependentPixel;
-use servo::webrender_api::units::DevicePixel;
+use servo::webrender_api::units::{DevicePixel, DeviceRect};
 use servo::webrender_api::ScrollLocation;
 use servo::webrender_traits::SurfmanRenderingContext;
 use servo::{
@@ -222,8 +222,16 @@ impl ServoGlue {
 
     /// Let Servo know that the window has been resized.
     pub fn resize(&mut self, coordinates: Coordinates) {
-        info!("resize");
+        info!("resize to {:?}", coordinates);
+        let size = coordinates.viewport.size;
+        let _ = self
+            .rendering_context
+            .resize(Size2D::new(size.width, size.height))
+            .inspect_err(|e| error!("Failed to resize rendering context: {e:?}"));
+        *self.callbacks.coordinates.borrow_mut() = coordinates;
         self.active_webview().notify_rendering_context_resized();
+        self.active_webview()
+            .move_resize(DeviceRect::from_size(size.to_f32()));
         self.maybe_perform_updates()
     }
 
@@ -638,10 +646,12 @@ impl ServoGlue {
                 EmbedderMsg::Keyboard(..) => {
                     error!("Received unexpected keyboard event");
                 },
+                EmbedderMsg::ResizeTo(size) => {
+                    error!("Received resize event (to {size:?}). Currently only the user can resize windows");
+                },
                 EmbedderMsg::Status(..) |
                 EmbedderMsg::SelectFiles(..) |
                 EmbedderMsg::MoveTo(..) |
-                EmbedderMsg::ResizeTo(..) |
                 EmbedderMsg::SetCursor(..) |
                 EmbedderMsg::NewFavicon(..) |
                 EmbedderMsg::HeadParsed |