Make RenderObject::style() return a const object

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 1616 matching lines @@
     FontBuilder fontBuilder(*this);
     RefPtrWillBeRawPtr<CSSFontSelector> selector = m_styleEngine->fontSelector();
     fontBuilder.createFontForDocument(selector, documentStyle);
 }
 
 void Document::inheritHtmlAndBodyElementStyles(StyleRecalcChange change)
 {
     ASSERT(inStyleRecalc());
     ASSERT(documentElement());
 
-    RefPtr<LayoutStyle> documentElementStyle = documentElement()->layoutStyle();
+    RefPtr<LayoutStyle> documentElementStyle = documentElement()->mutableLayoutStyle();
     if (!documentElementStyle || documentElement()->needsStyleRecalc() || change == Force)
         documentElementStyle = ensureStyleResolver().styleForElement(documentElement());
 
     WritingMode rootWritingMode = documentElementStyle->writingMode();
     TextDirection rootDirection = documentElementStyle->direction();
 
     HTMLElement* body = this->body();
     RefPtr<LayoutStyle> bodyStyle;
     if (body) {
-        bodyStyle = body->layoutStyle();
+        bodyStyle = body->mutableLayoutStyle();
         if (!bodyStyle || body->needsStyleRecalc() || documentElement()->needsStyleRecalc() || change == Force)
             bodyStyle = ensureStyleResolver().styleForElement(body, documentElementStyle.get());
         rootWritingMode = bodyStyle->writingMode();
         rootDirection = bodyStyle->direction();
     }
 
     RefPtr<LayoutStyle> overflowStyle;
     if (Element* element = viewportDefiningElement(documentElementStyle.get())) {
         if (element == body) {
             overflowStyle = bodyStyle;
@@ skipping 26 matching lines @@
             overflowX = OAUTO;
         if (overflowY == OVISIBLE)
             overflowY = OAUTO;
         // Column-gap is (ab)used by the current paged overflow implementation (in lack of other
         // ways to specify gaps between pages), so we have to propagate it too.
         columnGap = overflowStyle->columnGap();
     }
 
     WebScrollBlocksOn scrollBlocksOn = documentElementStyle->scrollBlocksOn();
 
-    RefPtr<LayoutStyle> documentStyle = renderView()->style();
+    RefPtr<LayoutStyle> documentStyle = renderView()->mutableStyle();
     if (documentStyle->writingMode() != rootWritingMode
         || documentStyle->direction() != rootDirection
         || documentStyle->overflowX() != overflowX
         || documentStyle->overflowY() != overflowY
         || documentStyle->columnGap() != columnGap
         || documentStyle->scrollBlocksOn() != scrollBlocksOn) {
         RefPtr<LayoutStyle> newStyle = LayoutStyle::clone(*documentStyle);
         newStyle->setWritingMode(rootWritingMode);
         newStyle->setDirection(rootDirection);
         newStyle->setColumnGap(columnGap);
         newStyle->setOverflowX(overflowX);
         newStyle->setOverflowY(overflowY);
         newStyle->setScrollBlocksOn(scrollBlocksOn);
         renderView()->setStyle(newStyle);
         setupFontBuilder(*newStyle);
     }
 
     if (body) {
-        if (LayoutStyle* style = body->layoutStyle()) {
+        if (const LayoutStyle* style = body->layoutStyle()) {
             if (style->direction() != rootDirection || style->writingMode() != rootWritingMode)
                 body->setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::WritingModeChange));
         }
     }
 
-    if (LayoutStyle* style = documentElement()->layoutStyle()) {
+    if (const LayoutStyle* style = documentElement()->layoutStyle()) {
         if (style->direction() != rootDirection || style->writingMode() != rootWritingMode)
             documentElement()->setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::WritingModeChange));
     }
 }
 
 void Document::updateRenderTree(StyleRecalcChange change)
 {
     ASSERT(isMainThread());
 
     ScriptForbiddenScope forbidScript;
@@ skipping 677 matching lines @@
 
 HTMLHeadElement* Document::head() const
 {
     Node* de = documentElement();
     if (!de)
         return 0;
 
     return Traversal<HTMLHeadElement>::firstChild(*de);
 }
 
-Element* Document::viewportDefiningElement(LayoutStyle* rootStyle) const
+Element* Document::viewportDefiningElement(const LayoutStyle* rootStyle) const
 {
     // If a BODY element sets non-visible overflow, it is to be propagated to the viewport, as long
     // as the following conditions are all met:
     // (1) The root element is HTML.
     // (2) It is the primary BODY element (we only assert for this, expecting callers to behave).
     // (3) The root element has visible overflow.
     // Otherwise it's the root element's properties that are to be propagated.
     Element* rootElement = documentElement();
     Element* bodyElement = body();
     if (!rootElement)
@@ skipping 1775 matching lines @@
     }
 
     m_encodingData = newData;
 
     // FIXME: Should be removed as part of https://code.google.com/p/chromium/issues/detail?id=319643
     bool shouldUseVisualOrdering = m_encodingData.encoding().usesVisualOrdering();
     if (shouldUseVisualOrdering != m_visuallyOrdered) {
         m_visuallyOrdered = shouldUseVisualOrdering;
         // FIXME: How is possible to not have a renderer here?
         if (renderView())
-            renderView()->style()->setRTLOrdering(m_visuallyOrdered ? VisualOrder : LogicalOrder);
+            renderView()->mutableStyleRef().setRTLOrdering(m_visuallyOrdered ? VisualOrder : LogicalOrder);
         setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::VisuallyOrdered));
     }
 }
 
 KURL Document::completeURL(const String& url) const
 {
     return completeURLWithOverride(url, m_baseURL);
 }
 
 KURL Document::completeURLWithOverride(const String& url, const KURL& baseURLOverride) const
@@ skipping 1545 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif