Bug 896261 - Remove aAppendedThemedBackground arguments from nsDisplayBackgroundImage::AppendBackgroundItemsToTop, nsFrame::DisplayBackgroundUnconditional; r=roc

layout/base/nsDisplayList.cpp

@@ -1633,16 +1633,11 @@ static nsStyleContext* GetBackgroundStyleContext(nsIFrame* aFrame)
   return sc;
 }
 
-/*static*/ nsresult
+/*static*/ bool
 nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuilder,
                                                      nsIFrame* aFrame,
-                                                     nsDisplayList* aList,
-                                                     bool* aAppendedThemedBackground)
+                                                     nsDisplayList* aList)
 {
-  if (aAppendedThemedBackground) {
-    *aAppendedThemedBackground = false;
-  }
-
   nsStyleContext* bgSC = nullptr;
   const nsStyleBackground* bg = nullptr;
   nsPresContext* presContext = aFrame->PresContext();
@@ -1676,14 +1671,11 @@ nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuil
     nsDisplayThemedBackground* bgItem =
       new (aBuilder) nsDisplayThemedBackground(aBuilder, aFrame);
     aList->AppendNewToTop(bgItem);
-    if (aAppendedThemedBackground) {
-      *aAppendedThemedBackground = true;
-    }
-    return NS_OK;
+    return true;
   }
 
   if (!bg) {
-    return NS_OK;
+    return false;
   }
  
   // Passing bg == nullptr in this macro will result in one iteration with
@@ -1697,7 +1689,7 @@ nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuil
     aList->AppendNewToTop(bgItem);
   }
 
-  return NS_OK;
+  return false;
 }
 
 // Check that the rounded border of aFrame, added to aToReferenceFrame,

layout/base/nsDisplayList.h

@@ -1959,12 +1959,10 @@ public:
   virtual ~nsDisplayBackgroundImage();
 
   // This will create and append new items for all the layers of the
-  // background. If given, aBackground will be set with the address of the
-  // bottom-most background item.
-  static nsresult AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuilder,
+  // background. Returns whether we appended a themed background.
+  static bool AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuilder,
                                          nsIFrame* aFrame,
-                                             nsDisplayList* aList,
-                                             bool* aAppendedThemedBackground = nullptr);
+                                         nsDisplayList* aList);
 
   virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
                                    LayerManager* aManager,

layout/generic/nsFrame.cpp

@@ -1481,25 +1481,20 @@ nsIFrame::GetCaretColorAt(int32_t aOffset)
   return StyleColor()->mColor;
 }
 
-void
+bool
 nsFrame::DisplayBackgroundUnconditional(nsDisplayListBuilder* aBuilder,
                                         const nsDisplayListSet& aLists,
-                                        bool                        aForceBackground,
-                                        bool*                       aAppendedThemedBackground)
+                                        bool aForceBackground)
 {
-  if (aAppendedThemedBackground) {
-    *aAppendedThemedBackground = false;
-  }
-
   // Here we don't try to detect background propagation. Frames that might
   // receive a propagated background should just set aForceBackground to
   // true.
   if (aBuilder->IsForEventDelivery() || aForceBackground ||
       !StyleBackground()->IsTransparent() || StyleDisplay()->mAppearance) {
-    nsDisplayBackgroundImage::AppendBackgroundItemsToTop(aBuilder, this,
-                                                         aLists.BorderBackground(),
-                                                         aAppendedThemedBackground);
+    return nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
+        aBuilder, this, aLists.BorderBackground());
   }
+  return false;
 }
 
 void
@@ -1519,9 +1514,8 @@ nsFrame::DisplayBorderBackgroundOutline(nsDisplayListBuilder*   aBuilder,
       nsDisplayBoxShadowOuter(aBuilder, this));
   }
 
-  bool bgIsThemed;
-  DisplayBackgroundUnconditional(aBuilder, aLists, aForceBackground,
-                                 &bgIsThemed);
+  bool bgIsThemed = DisplayBackgroundUnconditional(aBuilder, aLists,
+                                                   aForceBackground);
 
   if (shadows && shadows->HasShadowWithInset(true)) {
     aLists.BorderBackground()->AppendNewToTop(new (aBuilder)

layout/generic/nsFrame.h

@@ -494,14 +494,11 @@ public:
    * background style appears to have no background --- this is useful
    * for frames that might receive a propagated background via
    * nsCSSRendering::FindBackground
-   * @param aAppendedThemedBackground if non-null,
-   * *aAppendedThemedBackground will indicate whether a themed background
-   * item was created.
+   * @return whether a themed background item was created.
    */
-  void DisplayBackgroundUnconditional(nsDisplayListBuilder*   aBuilder,
+  bool DisplayBackgroundUnconditional(nsDisplayListBuilder* aBuilder,
                                       const nsDisplayListSet& aLists,
-                                      bool aForceBackground,
-                                      bool* aAppendedThemedBackground = nullptr);
+                                      bool aForceBackground);
   /**
    * Adds display items for standard CSS borders, background and outline for
    * for this frame, as necessary. Checks IsVisibleForPainting and won't