Bug 749055 - Add index parameter to nsDisplayMathMLCharForeground. r=roc

layout/mathml/nsMathMLChar.cpp

@@ -1899,8 +1899,9 @@ class nsDisplayMathMLCharForeground : public nsDisplayItem {
 public:
   nsDisplayMathMLCharForeground(nsDisplayListBuilder* aBuilder,
                                 nsIFrame* aFrame, nsMathMLChar* aChar,
-				                        bool aIsSelected)
-    : nsDisplayItem(aBuilder, aFrame), mChar(aChar), mIsSelected(aIsSelected) {
+				                PRUint32 aIndex, bool aIsSelected)
+    : nsDisplayItem(aBuilder, aFrame), mChar(aChar), 
+      mIndex(aIndex), mIsSelected(aIsSelected) {
     MOZ_COUNT_CTOR(nsDisplayMathMLCharForeground);
   }
 #ifdef NS_BUILD_REFCNT_LOGGING
@@ -1934,9 +1935,12 @@ public:
     bool snap;
     return GetBounds(aBuilder, &snap);
   }
+  
+  virtual PRUint32 GetPerFrameKey() { return (mIndex << nsDisplayItem::TYPE_BITS) | nsDisplayItem::GetPerFrameKey(); }
 
 private:
   nsMathMLChar* mChar;
+  PRUint32      mIndex;
   bool          mIsSelected;
 };
 
@@ -1982,6 +1986,7 @@ nsresult
 nsMathMLChar::Display(nsDisplayListBuilder*   aBuilder,
                       nsIFrame*               aForFrame,
                       const nsDisplayListSet& aLists,
+                      PRUint32                aIndex,
                       const nsRect*           aSelectedRect)
 {
   nsresult rv = NS_OK;
@@ -2026,6 +2031,7 @@ nsMathMLChar::Display(nsDisplayListBuilder*   aBuilder,
   }
   return aLists.Content()->AppendNewToTop(new (aBuilder)
         nsDisplayMathMLCharForeground(aBuilder, aForFrame, this,
+                                      aIndex,
                                       aSelectedRect && !aSelectedRect->IsEmpty()));
 }
 

layout/mathml/nsMathMLChar.h

@@ -131,6 +131,7 @@ public:
   Display(nsDisplayListBuilder*   aBuilder,
           nsIFrame*               aForFrame,
           const nsDisplayListSet& aLists,
+          PRUint32                aIndex,
           const nsRect*           aSelectedRect = nsnull);
           
   void PaintForeground(nsPresContext* aPresContext,

layout/mathml/nsMathMLmencloseFrame.cpp

@@ -236,7 +236,7 @@ nsMathMLmencloseFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
   mencloseRect.x = mencloseRect.y = 0;
 
   if (IsToDraw(NOTATION_RADICAL)) {
-    rv = mMathMLChar[mRadicalCharIndex].Display(aBuilder, this, aLists);
+    rv = mMathMLChar[mRadicalCharIndex].Display(aBuilder, this, aLists, 0);
     NS_ENSURE_SUCCESS(rv, rv);
 
     nsRect rect;
@@ -249,7 +249,7 @@ nsMathMLmencloseFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
   }
 
   if (IsToDraw(NOTATION_LONGDIV)) {
-    rv = mMathMLChar[mLongDivCharIndex].Display(aBuilder, this, aLists);
+    rv = mMathMLChar[mLongDivCharIndex].Display(aBuilder, this, aLists, 1);
     NS_ENSURE_SUCCESS(rv, rv);
 
     nsRect rect;

layout/mathml/nsMathMLmfencedFrame.cpp

@@ -220,18 +220,19 @@ nsMathMLmfencedFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
   
   ////////////
   // display fences and separators
+  PRUint32 count = 0;
   if (mOpenChar) {
-    rv = mOpenChar->Display(aBuilder, this, aLists);
+    rv = mOpenChar->Display(aBuilder, this, aLists, count++);
     NS_ENSURE_SUCCESS(rv, rv);
   }
   
   if (mCloseChar) {
-    rv = mCloseChar->Display(aBuilder, this, aLists);
+    rv = mCloseChar->Display(aBuilder, this, aLists, count++);
     NS_ENSURE_SUCCESS(rv, rv);
   }
   
   for (PRInt32 i = 0; i < mSeparatorsCount; i++) {
-    rv = mSeparatorsChar[i].Display(aBuilder, this, aLists);
+    rv = mSeparatorsChar[i].Display(aBuilder, this, aLists, count++);
     NS_ENSURE_SUCCESS(rv, rv);
   }
   return NS_OK;

layout/mathml/nsMathMLmoFrame.cpp

@@ -140,7 +140,7 @@ nsMathMLmoFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
       selectedRect = firstChild->GetRect();
       isSelected = true;
     }
-    rv = mMathMLChar.Display(aBuilder, this, aLists, isSelected ? &selectedRect : nsnull);
+    rv = mMathMLChar.Display(aBuilder, this, aLists, 0, isSelected ? &selectedRect : nsnull);
     NS_ENSURE_SUCCESS(rv, rv);
   
 #if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)

layout/mathml/nsMathMLmrootFrame.cpp

@@ -134,7 +134,7 @@ nsMathMLmrootFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
   /////////////
   // paint the sqrt symbol
   if (!NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
-    rv = mSqrChar.Display(aBuilder, this, aLists);
+    rv = mSqrChar.Display(aBuilder, this, aLists, 0);
     NS_ENSURE_SUCCESS(rv, rv);
 
     rv = DisplayBar(aBuilder, this, mBarRect, aLists);