Bug 1409114 - Part 9: Used cached values instead of calling nsDisplayListBuilder::ToReferenceFrame when possible, since it can be expensive when the requested frame isn't the builder's current frame. r=miko

Differential Revision: https://phabricator.services.mozilla.com/D29281

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

layout/painting/nsDisplayList.cpp

@@ -3764,8 +3764,8 @@ static nsIFrame* GetBackgroundComputedStyleFrame(nsIFrame* aFrame) {
 
 static void SetBackgroundClipRegion(
     DisplayListClipState::AutoSaveRestore& aClipState, nsIFrame* aFrame,
-    const nsPoint& aToReferenceFrame, const nsStyleImageLayers::Layer& aLayer,
-    const nsRect& aBackgroundRect, bool aWillPaintBorder) {
+    const nsStyleImageLayers::Layer& aLayer, const nsRect& aBackgroundRect,
+    bool aWillPaintBorder) {
   nsCSSRendering::ImageLayerClipState clip;
   nsCSSRendering::GetImageLayerClip(
       aLayer, aFrame, *aFrame->StyleBorder(), aBackgroundRect, aBackgroundRect,
@@ -3864,8 +3864,6 @@ bool nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
   bool willPaintBorder = aAllowWillPaintBorderOptimization && !isThemed &&
                          !hasInsetShadow && borderStyle->HasBorder();
 
-  nsPoint toRef = aBuilder->ToReferenceFrame(aFrame);
-
   // An auxiliary list is necessary in case we have background blending; if that
   // is the case, background items need to be wrapped by a blend container to
   // isolate blending to the background
@@ -3969,7 +3967,7 @@ bool nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
     DisplayListClipState::AutoSaveRestore clipState(aBuilder);
     if (!aBuilder->IsForEventDelivery()) {
       const nsStyleImageLayers::Layer& layer = bg->mImage.mLayers[i];
-      SetBackgroundClipRegion(clipState, aFrame, toRef, layer, bgRect,
+      SetBackgroundClipRegion(clipState, aFrame, layer, bgRect,
                               willPaintBorder);
     }
 

layout/tables/nsTableCellFrame.cpp

@@ -497,16 +497,17 @@ void nsTableCellFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
       // Create backgrounds items as needed for the column and column
       // group that this cell occupies.
       nsTableColFrame* col = backgrounds->GetColForIndex(ColIndex());
+      nsTableColGroupFrame* colGroup = col->GetTableColGroupFrame();
+
       nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
           aBuilder, col, bgRect, backgrounds->ColBackgrounds(), false, nullptr,
-          col->GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(col), this);
+          col->GetRect() + colGroup->GetPosition() +
+              backgrounds->TableToReferenceFrame(),
+          this);
 
-      nsIFrame* colGroup = col->GetParent();
       nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
           aBuilder, colGroup, bgRect, backgrounds->ColGroupBackgrounds(), false,
-          nullptr,
-          colGroup->GetRectRelativeToSelf() +
-              aBuilder->ToReferenceFrame(colGroup),
+          nullptr, colGroup->GetRect() + backgrounds->TableToReferenceFrame(),
           this);
     }
   }