share animation frame with renderService (#3796)

src/browser/services/RenderService.ts

@@ -9,7 +9,7 @@ import { EventEmitter, IEvent } from 'common/EventEmitter';
 import { Disposable } from 'common/Lifecycle';
 import { ScreenDprMonitor } from 'browser/ScreenDprMonitor';
 import { addDisposableDomListener } from 'browser/Lifecycle';
-import { IColorSet, IRenderDebouncer } from 'browser/Types';
+import { IColorSet, IRenderDebouncer, IRenderDebouncerWithCallback } from 'browser/Types';
 import { IOptionsService, IBufferService, IDecorationService } from 'common/services/Services';
 import { ICharSizeService, IRenderService } from 'browser/services/Services';
 
@@ -22,7 +22,7 @@ interface ISelectionState {
 export class RenderService extends Disposable implements IRenderService {
   public serviceBrand: undefined;
 
-  private _renderDebouncer: IRenderDebouncer;
+  private _renderDebouncer: IRenderDebouncerWithCallback;
   private _screenDprMonitor: ScreenDprMonitor;
 
   private _isPaused: boolean = false;
@@ -171,6 +171,10 @@ export class RenderService extends Disposable implements IRenderService {
     this._fullRefresh();
   }
 
+  public addRefreshCallback(callback: FrameRequestCallback): number {
+    return this._renderDebouncer.addRefreshCallback(callback);
+  }
+
   private _fullRefresh(): void {
     if (this._isPaused) {
       this._needsFullRefresh = true;

src/browser/services/Services.ts

@@ -5,7 +5,7 @@
 
 import { IEvent } from 'common/EventEmitter';
 import { IRenderDimensions, IRenderer } from 'browser/renderer/Types';
-import { IColorSet } from 'browser/Types';
+import { IColorSet, IRenderDebouncer } from 'browser/Types';
 import { ISelectionRedrawRequestEvent as ISelectionRequestRedrawEvent, ISelectionRequestScrollLinesEvent } from 'browser/selection/Types';
 import { createDecorator } from 'common/services/ServiceRegistry';
 import { IDisposable } from 'common/Types';
@@ -58,6 +58,8 @@ export interface IRenderService extends IDisposable {
 
   dimensions: IRenderDimensions;
 
+  addRefreshCallback(callback: FrameRequestCallback): number;
+
   refreshRows(start: number, end: number): void;
   clearTextureAtlas(): void;
   resize(cols: number, rows: number): void;