From kde-commits  Mon Oct 22 16:35:01 2007
From: Germain Garand <germain () ebooksfrance ! com>
Date: Mon, 22 Oct 2007 16:35:01 +0000
To: kde-commits
Subject: KDE/kdelibs/khtml/xml
Message-Id: <1193070901.438432.26315.nullmailer () svn ! kde ! org>
X-MARC-Message: https://marc.info/?l=kde-commits&m=119307094815075

SVN commit 728184 by ggarand:

Cache the document element: now that we have comments in dom,
it can be slow to walk the tree each and every time.

Adapted from similar change in WC r15247
by Timothy Hatcher <timothy@apple.com>


 M  +25 -4     dom_docimpl.cpp  
 M  +3 -0      dom_docimpl.h  


--- trunk/KDE/kdelibs/khtml/xml/dom_docimpl.cpp #728183:728184
@@ -376,6 +376,7 @@
     m_docLoading = false;
     m_inSyncLoad = false;
     m_loadingXMLDoc = 0;
+    m_documentElement = 0;
     m_cssTarget = 0;
     m_dynamicDomRestyler = new khtml::DynamicDomRestyler();
 }
@@ -420,6 +421,11 @@
             m_activeNode->deref();
             m_activeNode = 0;
         }
+        
+        if (m_documentElement) {
+            m_documentElement->deref();
+            m_documentElement = 0;
+        }
 
         removeChildren();
 
@@ -468,6 +474,8 @@
         m_hoverNode->deref();
     if (m_activeNode)
         m_activeNode->deref();
+    if (m_documentElement)
+        m_documentElement->deref();
 
     m_renderArena.reset();
 
@@ -485,12 +493,25 @@
     return m_implementation;
 }
 
+void DocumentImpl::childrenChanged()
+{
+    // invalidate the document element we have cached in case it was replaced
+    if (m_documentElement)
+        m_documentElement->deref();
+    m_documentElement = 0;
+}
+
 ElementImpl *DocumentImpl::documentElement() const
 {
-    NodeImpl *n = firstChild();
-    while (n && n->nodeType() != Node::ELEMENT_NODE)
-      n = n->nextSibling();
-    return static_cast<ElementImpl*>(n);
+    if (!m_documentElement) {
+        NodeImpl* n = firstChild();
+        while (n && n->nodeType() != Node::ELEMENT_NODE)
+            n = n->nextSibling();
+        m_documentElement = static_cast<ElementImpl*>(n);
+        if (m_documentElement)
+            m_documentElement->ref();
+    }
+    return m_documentElement;
 }
 
 ElementImpl *DocumentImpl::createElement( const DOMString &name, int* pExceptioncode )
--- trunk/KDE/kdelibs/khtml/xml/dom_docimpl.h #728183:728184
@@ -190,6 +190,7 @@
 
     DOMImplementationImpl *implementation() const;
     ElementImpl *documentElement() const;
+    virtual void childrenChanged();
     virtual ElementImpl *createElement ( const DOMString &tagName, int* pExceptioncode = 0 );
     virtual AttrImpl *createAttribute( const DOMString &tagName, int* pExceptioncode = 0 );
     DocumentFragmentImpl *createDocumentFragment ();
@@ -650,6 +651,8 @@
     DOMString m_title;
     DOMString m_preferredStylesheetSet;
     khtml::CachedCSSStyleSheet *m_loadingXMLDoc;
+    
+    mutable ElementImpl* m_documentElement;
 
     //int m_decoderMibEnum;