Bug 240933 - Part 11: Optimize setting the bidi flag for modifications to large DOM text nodes; r=smontagu a=dbaron

--HG--
extra : rebase_source : bdd58373ec59cdcdc231ca9eb61bc7a1a0c9191f

content/base/src/nsGenericDOMDataNode.cpp

@@ -385,7 +385,7 @@ nsGenericDOMDataNode::SetTextInternal(PRUint32 aOffset, PRUint32 aCount,
     delete [] to;
   }
 
-  SetBidiStatus();
+  UpdateBidiStatus(aBuffer, aLength);
 
   // Notify observers
   if (aNotify) {
@@ -1084,7 +1084,7 @@ nsGenericDOMDataNode::AppendTextTo(nsAString& aResult)
   mText.AppendTo(aResult);
 }
 
-void nsGenericDOMDataNode::SetBidiStatus()
+void nsGenericDOMDataNode::UpdateBidiStatus(const PRUnichar* aBuffer, PRUint32 aLength)
 {
   nsIDocument *document = GetCurrentDoc();
   if (document && document->GetBidiEnabled()) {
@@ -1092,7 +1092,7 @@ void nsGenericDOMDataNode::SetBidiStatus()
     return;
   }
 
-  mText.SetBidiFlag();
+  mText.UpdateBidiFlag(aBuffer, aLength);
 
   if (document && mText.IsBidi()) {
     document->SetBidiEnabled();

content/base/src/nsGenericDOMDataNode.h

@@ -358,7 +358,7 @@ protected:
   nsTextFragment mText;
 
 private:
-  void SetBidiStatus();
+  void UpdateBidiStatus(const PRUnichar* aBuffer, PRUint32 aLength);
 
   already_AddRefed<nsIAtom> GetCurrentValueAtom();
 };

content/base/src/nsTextFragment.cpp

@@ -372,11 +372,11 @@ nsTextFragment::Append(const PRUnichar* aBuffer, PRUint32 aLength)
 // To save time we only do this when we really want to know, not during
 // every allocation
 void
-nsTextFragment::SetBidiFlag()
+nsTextFragment::UpdateBidiFlag(const PRUnichar* aBuffer, PRUint32 aLength)
 {
   if (mState.mIs2b && !mState.mIsBidi) {
-    const PRUnichar* cp = m2b;
-    const PRUnichar* end = cp + mState.mLength;
+    const PRUnichar* cp = aBuffer;
+    const PRUnichar* end = cp + aLength;
     while (cp < end) {
       PRUnichar ch1 = *cp++;
       PRUint32 utf32Char = ch1;

content/base/src/nsTextFragment.h

@@ -112,7 +112,7 @@ public:
   /**
    * Return PR_TRUE if this fragment contains Bidi text
    * For performance reasons this flag is not set automatically, but
-   * requires an explicit call to SetBidiFlag()
+   * requires an explicit call to UpdateBidiFlag()
    */
   PRBool IsBidi() const
   {
@@ -209,7 +209,7 @@ public:
    * Scan the contents of the fragment and turn on mState.mIsBidi if it
    * includes any Bidi characters.
    */
-  void SetBidiFlag();
+  void UpdateBidiFlag(const PRUnichar* aBuffer, PRUint32 aLength);
 
   struct FragmentBits {
     // PRUint32 to ensure that the values are unsigned, because we