Bug 1768495 Part 1: Add a method nsIWidget::PauseOrResumeCompositor, and override it in nsCocoaWindow. r=gfx-reviewers,emilio,ahale

This change does not affect behavior, it's just prepatory for a later
caller to the newly-defined method.

Differential Revision: https://phabricator.services.mozilla.com/D169344

widget/cocoa/nsCocoaWindow.h

@@ -354,8 +354,7 @@ class nsCocoaWindow final : public nsBaseWidget, public nsPIWidgetCocoa {
 
   bool InFullScreenMode() const { return mInFullScreenMode; }
 
-  void PauseCompositor();
-  void ResumeCompositor();
+  void PauseOrResumeCompositor(bool aPause) override;
 
   bool AsyncPanZoomEnabled() const override;
 

widget/cocoa/nsCocoaWindow.mm

@@ -2111,11 +2111,7 @@ void nsCocoaWindow::DispatchSizeModeEvent() {
   }
 
   if (StaticPrefs::widget_pause_compositor_when_minimized()) {
-    if (newMode == nsSizeMode_Minimized) {
-      PauseCompositor();
-    } else {
-      ResumeCompositor();
-    }
+    PauseOrResumeCompositor(newMode == nsSizeMode_Minimized);
   }
 }
 
@@ -2155,30 +2151,6 @@ void nsCocoaWindow::ReportSizeEvent() {
   NS_OBJC_END_TRY_IGNORE_BLOCK;
 }
 
-void nsCocoaWindow::PauseCompositor() {
-  nsIWidget* mainChildView = static_cast<nsIWidget*>([[mWindow mainChildView] widget]);
-  if (!mainChildView) {
-    return;
-  }
-  CompositorBridgeChild* remoteRenderer = mainChildView->GetRemoteRenderer();
-  if (!remoteRenderer) {
-    return;
-  }
-  remoteRenderer->SendPause();
-}
-
-void nsCocoaWindow::ResumeCompositor() {
-  nsIWidget* mainChildView = static_cast<nsIWidget*>([[mWindow mainChildView] widget]);
-  if (!mainChildView) {
-    return;
-  }
-  CompositorBridgeChild* remoteRenderer = mainChildView->GetRemoteRenderer();
-  if (!remoteRenderer) {
-    return;
-  }
-  remoteRenderer->SendResume();
-}
-
 void nsCocoaWindow::SetMenuBar(RefPtr<nsMenuBarX>&& aMenuBar) {
   if (!mWindow) {
     mMenuBar = nullptr;
@@ -2598,6 +2570,12 @@ bool nsCocoaWindow::GetEditCommands(NativeKeyBindingsType aType, const WidgetKey
   return true;
 }
 
+void nsCocoaWindow::PauseOrResumeCompositor(bool aPause) {
+  if (auto* mainChildView = static_cast<nsIWidget*>([[mWindow mainChildView] widget])) {
+    mainChildView->PauseOrResumeCompositor(aPause);
+  }
+}
+
 bool nsCocoaWindow::AsyncPanZoomEnabled() const {
   if (mPopupContentView) {
     return mPopupContentView->AsyncPanZoomEnabled();

widget/nsBaseWidget.cpp

@@ -988,6 +988,18 @@ void nsBaseWidget::CreateCompositor() {
   CreateCompositor(rect.Width(), rect.Height());
 }
 
+void nsIWidget::PauseOrResumeCompositor(bool aPause) {
+  auto* renderer = GetRemoteRenderer();
+  if (!renderer) {
+    return;
+  }
+  if (aPause) {
+    renderer->SendPause();
+  } else {
+    renderer->SendResume();
+  }
+}
+
 already_AddRefed<GeckoContentController>
 nsBaseWidget::CreateRootContentController() {
   RefPtr<GeckoContentController> controller =

widget/nsIWidget.h

@@ -1973,6 +1973,11 @@ class nsIWidget : public nsISupports {
    */
   virtual CompositorBridgeChild* GetRemoteRenderer() { return nullptr; }
 
+  /**
+   * If there is a remote renderer, pause or resume it.
+   */
+  virtual void PauseOrResumeCompositor(bool aPause);
+
   /**
    * Clear WebRender resources
    */