Bug 1526972 - P3: De-virtualize HasDeletedFrame(). r=miko

To avoid expensive virtual dispatch in PreProcessDisplayList().

Depends on D24460

Differential Revision: https://phabricator.services.mozilla.com/D26136

--HG--
extra : moz-landing-system : lando

layout/ipc/RenderFrame.cpp

@@ -195,11 +195,6 @@ mozilla::LayerState nsDisplayRemote::GetLayerState(
   return mozilla::LAYER_ACTIVE_FORCE;
 }
 
-bool nsDisplayRemote::HasDeletedFrame() const {
-  // RenderFrame might change without invalidating nsSubDocumentFrame.
-  return !GetFrameLoader() || nsDisplayItem::HasDeletedFrame();
-}
-
 already_AddRefed<Layer> nsDisplayRemote::BuildLayer(
     nsDisplayListBuilder* aBuilder, LayerManager* aManager,
     const ContainerLayerParameters& aContainerParameters) {

layout/ipc/RenderFrame.h

@@ -90,6 +90,8 @@ class RenderFrame final {
  * nsFrameLoader) into its parent frame's layer tree.
  */
 class nsDisplayRemote final : public nsDisplayItem {
+  friend class nsDisplayItem;
+
   typedef mozilla::dom::TabId TabId;
   typedef mozilla::gfx::Matrix4x4 Matrix4x4;
   typedef mozilla::layers::EventRegionsOverride EventRegionsOverride;
@@ -103,8 +105,6 @@ class nsDisplayRemote final : public nsDisplayItem {
  public:
   nsDisplayRemote(nsDisplayListBuilder* aBuilder, nsSubDocumentFrame* aFrame);
 
-  bool HasDeletedFrame() const override;
-
   LayerState GetLayerState(
       nsDisplayListBuilder* aBuilder, LayerManager* aManager,
       const ContainerLayerParameters& aParameters) override;

layout/painting/nsDisplayList.cpp

@@ -101,6 +101,7 @@
 #include "mozilla/layers/WebRenderLayerManager.h"
 #include "mozilla/layers/WebRenderMessages.h"
 #include "mozilla/layers/WebRenderScrollData.h"
+#include "mozilla/layout/RenderFrame.h"
 
 using namespace mozilla;
 using namespace mozilla::layers;
@@ -3220,6 +3221,12 @@ bool nsDisplayItem::ForceActiveLayers() {
   return sForce;
 }
 
+bool nsDisplayItem::HasDeletedFrame() const {
+  return mItemFlags.contains(ItemFlag::DeletedFrame) ||
+         (GetType() == DisplayItemType::TYPE_REMOTE &&
+          !static_cast<const nsDisplayRemote*>(this)->GetFrameLoader());
+}
+
 int32_t nsDisplayItem::ZIndex() const { return mFrame->ZIndex(); }
 
 bool nsDisplayItem::ComputeVisibility(nsDisplayListBuilder* aBuilder,
@@ -3295,6 +3302,8 @@ void nsDisplayItem::FuseClipChainUpTo(nsDisplayListBuilder* aBuilder,
   }
 }
 
+void nsDisplayItem::SetDeletedFrame() { mItemFlags += ItemFlag::DeletedFrame; }
+
 bool nsDisplayItem::ShouldUseAdvancedLayer(LayerManager* aManager,
                                            PrefFunc aFunc) const {
   return CanUseAdvancedLayer(aManager) ? aFunc() : false;
@@ -6692,13 +6701,10 @@ nsIFrame* nsDisplaySubDocument::FrameForInvalidation() const {
   return mSubDocFrame ? mSubDocFrame : mFrame;
 }
 
-bool nsDisplaySubDocument::HasDeletedFrame() const {
-  return !mSubDocFrame || nsDisplayItem::HasDeletedFrame();
-}
-
 void nsDisplaySubDocument::RemoveFrame(nsIFrame* aFrame) {
   if (aFrame == mSubDocFrame) {
     mSubDocFrame = nullptr;
+    SetDeletedFrame();
   }
   nsDisplayItem::RemoveFrame(aFrame);
 }

layout/painting/nsDisplayList.h

@@ -2190,6 +2190,7 @@ class nsDisplayItem : public nsDisplayItemLink {
     if (mFrame && aFrame == mFrame) {
       MOZ_ASSERT(!mFrame->HasDisplayItem(this));
       mFrame = nullptr;
+      SetDeletedFrame();
       SetDisplayItemData(nullptr, nullptr);
     }
   }
@@ -2301,7 +2302,7 @@ class nsDisplayItem : public nsDisplayItemLink {
    */
   virtual nsIFrame* FrameForInvalidation() const { return mFrame; }
 
-  virtual bool HasDeletedFrame() const { return !mFrame; }
+  bool HasDeletedFrame() const;
 
   virtual nsIFrame* StyleFrame() const { return mFrame; }
 
@@ -2989,11 +2990,14 @@ class nsDisplayItem : public nsDisplayItemLink {
 #endif
 
  protected:
+  void SetDeletedFrame();
+
   typedef bool (*PrefFunc)(void);
   bool ShouldUseAdvancedLayer(LayerManager* aManager, PrefFunc aFunc) const;
   bool CanUseAdvancedLayer(LayerManager* aManager) const;
 
   enum class ItemFlag {
+    DeletedFrame,
     ForceNotVisible,
     DisableSubpixelAA,
     CantBeReused,
@@ -4543,13 +4547,10 @@ class nsDisplayTableBackgroundImage : public nsDisplayBackgroundImage {
 
   nsIFrame* FrameForInvalidation() const override { return mStyleFrame; }
 
-  bool HasDeletedFrame() const override {
-    return !mStyleFrame || nsDisplayBackgroundImage::HasDeletedFrame();
-  }
-
   void RemoveFrame(nsIFrame* aFrame) override {
     if (aFrame == mStyleFrame) {
       mStyleFrame = nullptr;
+      SetDeletedFrame();
     }
     nsDisplayBackgroundImage::RemoveFrame(aFrame);
   }
@@ -4674,13 +4675,10 @@ class nsDisplayTableThemedBackground : public nsDisplayThemedBackground {
 
   nsIFrame* FrameForInvalidation() const override { return mAncestorFrame; }
 
-  bool HasDeletedFrame() const override {
-    return !mAncestorFrame || nsDisplayThemedBackground::HasDeletedFrame();
-  }
-
   void RemoveFrame(nsIFrame* aFrame) override {
     if (aFrame == mAncestorFrame) {
       mAncestorFrame = nullptr;
+      SetDeletedFrame();
     }
     nsDisplayThemedBackground::RemoveFrame(aFrame);
   }
@@ -4854,13 +4852,10 @@ class nsDisplayTableBackgroundColor : public nsDisplayBackgroundColor {
 
   nsIFrame* FrameForInvalidation() const override { return mAncestorFrame; }
 
-  bool HasDeletedFrame() const override {
-    return !mAncestorFrame || nsDisplayBackgroundColor::HasDeletedFrame();
-  }
-
   void RemoveFrame(nsIFrame* aFrame) override {
     if (aFrame == mAncestorFrame) {
       mAncestorFrame = nullptr;
+      SetDeletedFrame();
     }
     nsDisplayBackgroundColor::RemoveFrame(aFrame);
   }
@@ -5676,13 +5671,10 @@ class nsDisplayTableBlendMode : public nsDisplayBlendMode {
 
   nsIFrame* FrameForInvalidation() const override { return mAncestorFrame; }
 
-  bool HasDeletedFrame() const override {
-    return !mAncestorFrame || nsDisplayBlendMode::HasDeletedFrame();
-  }
-
   void RemoveFrame(nsIFrame* aFrame) override {
     if (aFrame == mAncestorFrame) {
       mAncestorFrame = nullptr;
+      SetDeletedFrame();
     }
     nsDisplayBlendMode::RemoveFrame(aFrame);
   }
@@ -5783,13 +5775,10 @@ class nsDisplayTableBlendContainer : public nsDisplayBlendContainer {
 
   nsIFrame* FrameForInvalidation() const override { return mAncestorFrame; }
 
-  bool HasDeletedFrame() const override {
-    return !mAncestorFrame || nsDisplayBlendContainer::HasDeletedFrame();
-  }
-
   void RemoveFrame(nsIFrame* aFrame) override {
     if (aFrame == mAncestorFrame) {
       mAncestorFrame = nullptr;
+      SetDeletedFrame();
     }
     nsDisplayBlendContainer::RemoveFrame(aFrame);
   }
@@ -6016,7 +6005,6 @@ class nsDisplaySubDocument : public nsDisplayOwnLayer {
       const ContainerLayerParameters& aContainerParameters);
 
   nsIFrame* FrameForInvalidation() const override;
-  bool HasDeletedFrame() const override;
   void RemoveFrame(nsIFrame* aFrame) override;
 
   void Disown();
@@ -6198,13 +6186,10 @@ class nsDisplayTableFixedPosition : public nsDisplayFixedPosition {
 
   nsIFrame* FrameForInvalidation() const override { return mAncestorFrame; }
 
-  bool HasDeletedFrame() const override {
-    return !mAncestorFrame || nsDisplayFixedPosition::HasDeletedFrame();
-  }
-
   void RemoveFrame(nsIFrame* aFrame) override {
     if (aFrame == mAncestorFrame) {
       mAncestorFrame = nullptr;
+      SetDeletedFrame();
     }
     nsDisplayFixedPosition::RemoveFrame(aFrame);
   }