Make RenderObject::style() return a const object

Source/core/rendering/RenderBlockLineLayout.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 767 matching lines @@
     removeFloatingObjectsBelow(lastFloatFromPreviousLine, oldLogicalHeight);
     setLogicalHeight(newLogicalHeight);
     resolver.setPositionIgnoringNestedIsolates(oldEnd);
     return oldEnd;
 }
 
 void RenderBlockFlow::layoutRunsAndFloatsInRange(LineLayoutState& layoutState,
     InlineBidiResolver& resolver, const InlineIterator& cleanLineStart,
     const BidiStatus& cleanLineBidiStatus)
 {
-    RenderStyle* styleToUse = style();
+    const RenderStyle* styleToUse = style();
     bool paginated = view()->layoutState() && view()->layoutState()->isPaginated();
     LineMidpointState& lineMidpointState = resolver.midpointState();
     InlineIterator endOfLine = resolver.position();
     bool checkForEndLineMatch = layoutState.endLine();
     RenderTextInfo renderTextInfo;
     VerticalPositionCache verticalPositionCache;
 
     LineBreaker lineBreaker(this);
 
     while (!endOfLine.atEnd()) {
@@ skipping 347 matching lines @@
 
 static LayoutUnit getBPMWidth(LayoutUnit childValue, Length cssUnit)
 {
     if (cssUnit.type() != Auto)
         return (cssUnit.isFixed() ? static_cast<LayoutUnit>(cssUnit.value()) : childValue);
     return LayoutUnit();
 }
 
 static LayoutUnit getBorderPaddingMargin(RenderBoxModelObject* child, bool endOfInline)
 {
-    RenderStyle* childStyle = child->style();
+    const RenderStyle* childStyle = child->style();
     if (endOfInline) {
         return getBPMWidth(child->marginEnd(), childStyle->marginEnd()) +
             getBPMWidth(child->paddingEnd(), childStyle->paddingEnd()) +
             child->borderEnd();
     }
     return getBPMWidth(child->marginStart(), childStyle->marginStart()) +
         getBPMWidth(child->paddingStart(), childStyle->paddingStart()) +
         child->borderStart();
 }
 
@@ skipping 37 matching lines @@
     return LayoutUnit::fromFloatCeil(value);
 }
 
 // FIXME: This function should be broken into something less monolithic.
 // FIXME: The main loop here is very similar to LineBreaker::nextSegmentBreak. They can probably reuse code.
 void RenderBlockFlow::computeInlinePreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth)
 {
     FloatWillBeLayoutUnit inlineMax;
     FloatWillBeLayoutUnit inlineMin;
 
-    RenderStyle* styleToUse = style();
+    const RenderStyle* styleToUse = style();
     RenderBlock* containingBlock = this->containingBlock();
     LayoutUnit cw = containingBlock ? containingBlock->contentLogicalWidth() : LayoutUnit();
 
     // If we are at the start of a line, we want to ignore all white-space.
     // Also strip spaces if we previously had text that ended in a trailing space.
     bool stripFrontSpaces = true;
     RenderObject* trailingSpaceChild = 0;
 
     // Firefox and Opera will allow a table cell to grow to fit an image inside it under
     // very specific cirucumstances (in order to match common WinIE renderings).
@@ skipping 47 matching lines @@
             // If the text string starts with whitespace, then we need to go ahead and
             // terminate our current line (unless we're already in a whitespace stripping
             // mode.
             //
             // If the text string has a breakable character in the middle, but didn't start
             // with whitespace, then we add the width of the first non-breakable run and
             // then end the current line. We then need to use the intermediate min/max width
             // values (if any of them are larger than our current min/max). We then look at
             // the width of the last non-breakable run and use that to start a new line
             // (unless we end in whitespace).
-            RenderStyle* childStyle = child->style();
+            const RenderStyle* childStyle = child->style();
             FloatWillBeLayoutUnit childMin;
             FloatWillBeLayoutUnit childMax;
 
             if (!child->isText()) {
                 // Case (1) and (2). Inline replaced and inline flow elements.
                 if (child->isRenderInline()) {
                     // Add in padding/border/margin from the appropriate side of
                     // the element.
                     FloatWillBeLayoutUnit bpm = getBorderPaddingMargin(toRenderInline(child), childIterator.endOfInline);
                     childMin += bpm;
@@ skipping 758 matching lines @@
     float logicalLeft = logicalLeftOffsetForLine(logicalHeight(), false).toFloat();
     float availableLogicalWidth = logicalRightOffsetForLine(logicalHeight(), false) - logicalLeft;
     updateLogicalWidthForAlignment(textAlign, 0, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
 
     if (!style()->isLeftToRightDirection())
         return logicalWidth() - logicalLeft;
     return logicalLeft;
 }
 
 }