Bug 1728232 - Remove RestoreState. r=miko

Differential Revision: https://phabricator.services.mozilla.com/D124006

layout/generic/TextDrawTarget.h

@@ -76,7 +76,7 @@ class TextDrawTarget : public DrawTarget {
     mHasUnsupportedFeatures = false;
     mHasShadows = false;
 
-    SetPermitSubpixelAA(!aItem->IsSubpixelAADisabled());
+    SetPermitSubpixelAA(true);
 
     // Compute clip/bounds
     auto appUnitsPerDevPixel =

layout/generic/TextOverflow.cpp

@@ -209,9 +209,6 @@ static void PaintTextShadowCallback(gfxContext* aCtx, nsPoint aShadowOffset,
 
 void nsDisplayTextOverflowMarker::Paint(nsDisplayListBuilder* aBuilder,
                                         gfxContext* aCtx) {
-  DrawTargetAutoDisableSubpixelAntialiasing disable(aCtx->GetDrawTarget(),
-                                                    IsSubpixelAADisabled());
-
   nscolor foregroundColor =
       nsLayoutUtils::GetColor(mFrame, &nsStyleText::mWebkitTextFillColor);
 

layout/generic/nsPageFrame.cpp

@@ -407,7 +407,7 @@ class nsDisplayHeaderFooter final : public nsPaintedDisplayItem {
     MOZ_ASSERT(pageFrame, "We should have an nsPageFrame");
 #endif
     static_cast<nsPageFrame*>(mFrame)->PaintHeaderFooter(
-        *aCtx, ToReferenceFrame(), IsSubpixelAADisabled());
+        *aCtx, ToReferenceFrame(), false);
   }
   NS_DISPLAY_DECL_NAME("HeaderFooter", TYPE_HEADER_FOOTER)
 

layout/painting/RetainedDisplayListBuilder.cpp

@@ -280,13 +280,6 @@ bool RetainedDisplayListBuilder::PreProcessDisplayList(
       mBuilder.MarkFrameForDisplayIfVisible(f, mBuilder.RootReferenceFrame());
     }
 
-    // TODO: This is here because we sometimes reuse the previous display list
-    // completely. For optimization, we could only restore the state for reused
-    // display items.
-    if (item->RestoreState()) {
-      item->InvalidateItemCacheEntry();
-    }
-
     // If we're going to keep this linked list and not merge it, then mark the
     // item as used and put it back into the list.
     if (aKeepLinked) {

layout/painting/nsDisplayList.cpp

@@ -2830,11 +2830,6 @@ void nsDisplayItem::SetClipChain(const DisplayItemClipChain* aClipChain,
                                  bool aStore) {
   mClipChain = aClipChain;
   mClip = DisplayItemClipChain::ClipForASR(aClipChain, mActiveScrolledRoot);
-
-  if (aStore) {
-    mState.mClipChain = mClipChain;
-    mState.mClip = mClip;
-  }
 }
 
 Maybe<nsRect> nsDisplayItem::GetClipWithRespectToASR(
@@ -4782,6 +4777,7 @@ nsDisplayWrapList::nsDisplayWrapList(
 
   mListPtr = &mList;
   mListPtr->AppendToTop(aList);
+  mOriginalClipChain = mClipChain;
   nsDisplayWrapList::UpdateBounds(aBuilder);
 
 #ifdef DEBUG
@@ -4810,6 +4806,7 @@ nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
 
   mListPtr = &mList;
   mListPtr->AppendToTop(aItem);
+  mOriginalClipChain = mClipChain;
   nsDisplayWrapList::UpdateBounds(aBuilder);
 
   if (!aFrame || !aFrame->IsTransformed()) {
@@ -5863,8 +5860,7 @@ void nsDisplayStickyPosition::SetClipChain(
              "with it.");
 
   if (aStore) {
-    mState.mClipChain = aClipChain;
-    mState.mClip = mClip;
+    mOriginalClipChain = aClipChain;
   }
 }
 
@@ -6404,7 +6400,6 @@ void nsDisplayTransform::SetReferenceFrameToAncestor(
 
 void nsDisplayTransform::Init(nsDisplayListBuilder* aBuilder,
                               nsDisplayList* aChildren) {
-  mShouldFlatten = false;
   mChildren.AppendToTop(aChildren);
   UpdateBounds(aBuilder);
 }
@@ -7818,9 +7813,6 @@ bool nsDisplayText::CanApplyOpacity(WebRenderLayerManager* aManager,
 
 void nsDisplayText::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
   AUTO_PROFILER_LABEL("nsDisplayText::Paint", GRAPHICS);
-
-  DrawTargetAutoDisableSubpixelAntialiasing disable(aCtx->GetDrawTarget(),
-                                                    IsSubpixelAADisabled());
   RenderToContext(aCtx, aBuilder);
 }
 

layout/painting/nsDisplayList.h

@@ -2402,9 +2402,6 @@ class nsDisplayItem : public nsDisplayItemLink {
     if (aOther.ForceNotVisible()) {
       mItemFlags += ItemFlag::ForceNotVisible;
     }
-    if (aOther.IsSubpixelAADisabled()) {
-      mItemFlags += ItemFlag::DisableSubpixelAA;
-    }
     if (mFrame->In3DContextAndBackfaceIsHidden()) {
       mItemFlags += ItemFlag::BackfaceHidden;
     }
@@ -2439,24 +2436,6 @@ class nsDisplayItem : public nsDisplayItemLink {
   nsDisplayItem() = delete;
   nsDisplayItem(const nsDisplayItem&) = delete;
 
-  /**
-   * Roll back side effects carried out by processing the display list.
-   *
-   * @return true if the rollback actually modified anything, to help the caller
-   * decide whether to invalidate cached information about this node.
-   */
-  virtual bool RestoreState() {
-    if (mClipChain == mState.mClipChain && mClip == mState.mClip &&
-        !mItemFlags.contains(ItemFlag::DisableSubpixelAA)) {
-      return false;
-    }
-
-    mClipChain = mState.mClipChain;
-    mClip = mState.mClip;
-    mItemFlags -= ItemFlag::DisableSubpixelAA;
-    return true;
-  }
-
   /**
    * Invalidate cached information that depends on this node's contents, after
    * a mutation of those contents.
@@ -2861,16 +2840,6 @@ class nsDisplayItem : public nsDisplayItemLink {
     return nsRect();
   }
 
-  /**
-   * Disable usage of component alpha. Currently only relevant for items that
-   * have text.
-   */
-  void DisableComponentAlpha() { mItemFlags += ItemFlag::DisableSubpixelAA; }
-
-  bool IsSubpixelAADisabled() const {
-    return mItemFlags.contains(ItemFlag::DisableSubpixelAA);
-  }
-
   /**
    * Check if we can add async animations to the layer for this display item.
    */
@@ -2969,7 +2938,6 @@ class nsDisplayItem : public nsDisplayItemLink {
 #endif
     BackfaceHidden,
     Combines3DTransformWithAncestors,
-    DisableSubpixelAA,
     ForceNotVisible,
     HasHitTestInfo,
     IsGlassItem,
@@ -3011,11 +2979,6 @@ class nsDisplayItem : public nsDisplayItemLink {
   RefPtr<const DisplayItemClipChain> mClipChain;
   const DisplayItemClip* mClip = nullptr;
 
-  struct {
-    RefPtr<const DisplayItemClipChain> mClipChain;
-    const DisplayItemClip* mClip;
-  } mState;
-
 #ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
  public:
   bool IsMergedItem() const {
@@ -4898,6 +4861,7 @@ class nsDisplayWrapList : public nsPaintedDisplayItem {
     MOZ_COUNT_CTOR(nsDisplayWrapList);
     mBaseBuildingRect = GetBuildingRect();
     mListPtr = &mList;
+    mOriginalClipChain = mClipChain;
   }
 
   nsDisplayWrapList() = delete;
@@ -4915,6 +4879,7 @@ class nsDisplayWrapList : public nsPaintedDisplayItem {
         mMergedFrames(aOther.mMergedFrames.Clone()),
         mBounds(aOther.mBounds),
         mBaseBuildingRect(aOther.mBaseBuildingRect),
+        mOriginalClipChain(aOther.mClipChain),
         mOverrideZIndex(aOther.mOverrideZIndex),
         mHasZIndexOverride(aOther.mHasZIndexOverride),
         mClearingClipChain(aOther.mClearingClipChain) {
@@ -4946,7 +4911,7 @@ class nsDisplayWrapList : public nsPaintedDisplayItem {
     // Clear the clip chain up to the asr, but don't store it, so that we'll
     // recover it when we reuse the item.
     if (mClearingClipChain) {
-      const DisplayItemClipChain* clip = mState.mClipChain;
+      const DisplayItemClipChain* clip = mOriginalClipChain;
       while (clip && ActiveScrolledRoot::IsAncestor(GetActiveScrolledRoot(),
                                                     clip->mASR)) {
         clip = clip->mParent;
@@ -4968,6 +4933,15 @@ class nsDisplayWrapList : public nsPaintedDisplayItem {
     SetBuildingRect(buildingRect);
   }
 
+  void SetClipChain(const DisplayItemClipChain* aClipChain,
+                    bool aStore) override {
+    nsDisplayItem::SetClipChain(aClipChain, aStore);
+
+    if (aStore) {
+      mOriginalClipChain = mClipChain;
+    }
+  }
+
   void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
                HitTestState* aState, nsTArray<nsIFrame*>* aOutFrames) override;
   nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) const override;
@@ -5091,6 +5065,7 @@ class nsDisplayWrapList : public nsPaintedDisplayItem {
   // Displaylist building rect contributed by this display item itself.
   // Our mBuildingRect may include the visible areas of children.
   nsRect mBaseBuildingRect;
+  RefPtr<const DisplayItemClipChain> mOriginalClipChain;
   int32_t mOverrideZIndex;
   bool mHasZIndexOverride;
   bool mClearingClipChain = false;
@@ -6238,15 +6213,6 @@ class nsDisplayTransform : public nsPaintedDisplayItem {
 
   NS_DISPLAY_DECL_NAME("nsDisplayTransform", TYPE_TRANSFORM)
 
-  bool RestoreState() override {
-    if (!nsPaintedDisplayItem::RestoreState() && !mShouldFlatten) {
-      return false;
-    }
-
-    mShouldFlatten = false;
-    return true;
-  }
-
   void UpdateBounds(nsDisplayListBuilder* aBuilder) override;
 
   /**
@@ -6316,8 +6282,6 @@ class nsDisplayTransform : public nsPaintedDisplayItem {
     }
   }
 
-  bool NeedsGeometryUpdates() const override { return mShouldFlatten; }
-
   const nsIFrame* ReferenceFrameForChildren() const override {
     // If we were created using a transform-getter, then we don't
     // belong to a transformed frame, and aren't a reference frame
@@ -6583,8 +6547,6 @@ class nsDisplayTransform : public nsPaintedDisplayItem {
   // parent context unintendedly if the root of the child preserves3d context
   // doesn't create a transform item.
   bool mIsTransformSeparator : 1;
-  // True if this nsDisplayTransform should get flattened
-  bool mShouldFlatten : 1;
   // True if we have a transform getter.
   bool mHasTransformGetter : 1;
 };

layout/svg/SVGTextFrame.cpp

@@ -2714,9 +2714,6 @@ void DisplaySVGText::HitTest(nsDisplayListBuilder* aBuilder,
 }
 
 void DisplaySVGText::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
-  DrawTargetAutoDisableSubpixelAntialiasing disable(aCtx->GetDrawTarget(),
-                                                    IsSubpixelAADisabled());
-
   uint32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
 
   // ToReferenceFrame includes our mRect offset, but painting takes

layout/xul/nsTextBoxFrame.cpp

@@ -263,9 +263,6 @@ static void PaintTextShadowCallback(gfxContext* aCtx, nsPoint aShadowOffset,
 
 void nsDisplayXULTextBox::Paint(nsDisplayListBuilder* aBuilder,
                                 gfxContext* aCtx) {
-  DrawTargetAutoDisableSubpixelAntialiasing disable(aCtx->GetDrawTarget(),
-                                                    IsSubpixelAADisabled());
-
   // Paint the text shadow before doing any foreground stuff
   nsRect drawRect =
       static_cast<nsTextBoxFrame*>(mFrame)->mTextDrawRect + ToReferenceFrame();

layout/xul/tree/nsTreeBodyFrame.cpp

@@ -2525,9 +2525,6 @@ class nsDisplayTreeBody final : public nsPaintedDisplayItem {
   virtual void Paint(nsDisplayListBuilder* aBuilder,
                      gfxContext* aCtx) override {
     MOZ_ASSERT(aBuilder);
-    DrawTargetAutoDisableSubpixelAntialiasing disable(aCtx->GetDrawTarget(),
-                                                      IsSubpixelAADisabled());
-
     ImgDrawResult result = static_cast<nsTreeBodyFrame*>(mFrame)->PaintTreeBody(
         *aCtx, GetPaintRect(aBuilder, aCtx), ToReferenceFrame(), aBuilder);