Use non-IPC webrender API over explicit IPC channels.

components/layout_thread_2020/lib.rs

@@ -64,9 +64,9 @@ use script_layout_interface::message::{LayoutThreadInit, Msg, NodesFromPointQuer
 use script_layout_interface::message::{QueryMsg, ReflowComplete, ReflowGoal, ScriptReflow};
 use script_layout_interface::rpc::TextIndexResponse;
 use script_layout_interface::rpc::{LayoutRPC, OffsetParentResponse, StyleResponse};
-use script_traits::Painter;
 use script_traits::{ConstellationControlMsg, LayoutControlMsg, LayoutMsg as ConstellationMsg};
 use script_traits::{DrawAPaintImageResult, PaintWorkletError};
+use script_traits::{Painter, WebrenderIpcSender};
 use script_traits::{ScrollState, UntrustedNodeAddress, WindowSizeData};
 use selectors::Element;
 use servo_arc::Arc as ServoArc;
@@ -193,7 +193,7 @@ pub struct LayoutThread {
     registered_painters: RegisteredPaintersImpl,
 
     /// Webrender interface.
-    webrender_api: webrender_api::RenderApi,
+    webrender_api: WebrenderIpcSender,
 
     /// Webrender document.
     webrender_document: webrender_api::DocumentId,
@@ -233,7 +233,7 @@ impl LayoutThreadFactory for LayoutThread {
         font_cache_thread: FontCacheThread,
         time_profiler_chan: profile_time::ProfilerChan,
         mem_profiler_chan: profile_mem::ProfilerChan,
-        webrender_api_sender: webrender_api::RenderApiSender,
+        webrender_api_sender: WebrenderIpcSender,
         webrender_document: webrender_api::DocumentId,
         paint_time_metrics: PaintTimeMetrics,
         busy: Arc<AtomicBool>,
@@ -442,7 +442,7 @@ impl LayoutThread {
         font_cache_thread: FontCacheThread,
         time_profiler_chan: profile_time::ProfilerChan,
         mem_profiler_chan: profile_mem::ProfilerChan,
-        webrender_api_sender: webrender_api::RenderApiSender,
+        webrender_api_sender: WebrenderIpcSender,
         webrender_document: webrender_api::DocumentId,
         paint_time_metrics: PaintTimeMetrics,
         busy: Arc<AtomicBool>,
@@ -451,18 +451,7 @@ impl LayoutThread {
         relayout_event: bool,
     ) -> LayoutThread {
         // Let webrender know about this pipeline by sending an empty display list.
-        let mut epoch = Epoch(0);
-        let webrender_api = webrender_api_sender.create_api();
-        let mut txn = webrender_api::Transaction::new();
-        txn.set_display_list(
-            webrender_api::Epoch(epoch.0),
-            None,
-            Default::default(),
-            (id.to_webrender(), Default::default(), Default::default()),
-            false,
-        );
-        webrender_api.send_transaction(webrender_document, txn);
-        epoch.next();
+        webrender_api_sender.send_initial_transaction(webrender_document, id.to_webrender());
 
         // The device pixel ratio is incorrect (it does not have the hidpi value),
         // but it will be set correctly when the initial reflow takes place.
@@ -506,9 +495,10 @@ impl LayoutThread {
             box_tree_root: Default::default(),
             fragment_tree_root: Default::default(),
             document_shared_lock: None,
-            epoch: Cell::new(Epoch(0)),
+            // Epoch starts at 1 because of the initial display list for epoch 0 that we send to WR
+            epoch: Cell::new(Epoch(1)),
             viewport_size: Size2D::new(Au(0), Au(0)),
-            webrender_api: webrender_api_sender.create_api(),
+            webrender_api: webrender_api_sender,
             webrender_document,
             stylist: Stylist::new(device, QuirksMode::NoQuirks),
             rw_data: Arc::new(Mutex::new(LayoutThreadData {
@@ -719,14 +709,12 @@ impl LayoutThread {
                     .insert(state.scroll_id, state.scroll_offset);
 
                 let point = Point2D::new(-state.scroll_offset.x, -state.scroll_offset.y);
-                let mut txn = webrender_api::Transaction::new();
-                txn.scroll_node_with_id(
+                self.webrender_api.send_scroll_node(
+                    self.webrender_document,
                     webrender_api::units::LayoutPoint::from_untyped(point),
                     state.scroll_id,
                     webrender_api::ScrollClamping::ToContentBounds,
                 );
-                self.webrender_api
-                    .send_transaction(self.webrender_document, txn);
             },
             Msg::ReapStyleAndLayoutData(dead_data) => unsafe {
                 drop_style_and_layout_data(dead_data)
@@ -816,7 +804,7 @@ impl LayoutThread {
             self.font_cache_thread.clone(),
             self.time_profiler_chan.clone(),
             self.mem_profiler_chan.clone(),
-            self.webrender_api.clone_sender(),
+            self.webrender_api.clone(),
             self.webrender_document,
             info.paint_time_metrics,
             info.layout_is_busy,
@@ -1308,17 +1296,12 @@ impl LayoutThread {
         self.paint_time_metrics
             .maybe_observe_paint_time(self, epoch, is_contentful.0);
 
-        let mut txn = webrender_api::Transaction::new();
-        txn.set_display_list(
-            webrender_api::Epoch(epoch.0),
-            None,
+        self.webrender_api.send_display_list(
+            self.webrender_document,
+            epoch,
             viewport_size,
             display_list.wr.finalize(),
-            true,
         );
-        txn.generate_frame();
-        self.webrender_api
-            .send_transaction(self.webrender_document, txn);
 
         self.generation.set(self.generation.get() + 1);
     }