Make RenderObject::style() return a const object

Source/core/paint/TextPainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/TextPainter.h"
 
 #include "core/CSSPropertyNames.h"
 #include "core/frame/Settings.h"
 #include "core/rendering/InlineTextBox.h"
@@ skipping 90 matching lines @@
 }
 
 static Color textColorForWhiteBackground(Color textColor)
 {
     int distanceFromWhite = differenceSquared(textColor, Color::white);
     // semi-arbitrarily chose 65025 (255^2) value here after a few tests;
     return distanceFromWhite > 65025 ? textColor : textColor.dark();
 }
 
 // static
-TextPainter::Style TextPainter::textPaintingStyle(RenderObject& renderer, RenderStyle* style, bool forceBlackText, bool isPrinting)
+TextPainter::Style TextPainter::textPaintingStyle(RenderObject& renderer, const RenderStyle* style, bool forceBlackText, bool isPrinting)
 {
     TextPainter::Style textStyle;
 
     if (forceBlackText) {
         textStyle.fillColor = Color::black;
         textStyle.strokeColor = Color::black;
         textStyle.emphasisMarkColor = Color::black;
         textStyle.strokeWidth = style->textStrokeWidth();
         textStyle.shadow = 0;
     } else {
@@ skipping 28 matching lines @@
 TextPainter::Style TextPainter::selectionPaintingStyle(RenderObject& renderer, bool haveSelection, bool forceBlackText, bool isPrinting, const TextPainter::Style& textStyle)
 {
     TextPainter::Style selectionStyle = textStyle;
 
     if (haveSelection) {
         if (!forceBlackText) {
             selectionStyle.fillColor = renderer.selectionForegroundColor();
             selectionStyle.emphasisMarkColor = renderer.selectionEmphasisMarkColor();
         }
 
-        if (RenderStyle* pseudoStyle = renderer.getCachedPseudoStyle(SELECTION)) {
+        if (const RenderStyle* pseudoStyle = renderer.getCachedPseudoStyle(SELECTION)) {
             selectionStyle.strokeColor = forceBlackText ? Color::black : renderer.resolveColor(pseudoStyle, CSSPropertyWebkitTextStrokeColor);
             selectionStyle.strokeWidth = pseudoStyle->textStrokeWidth();
             selectionStyle.shadow = forceBlackText ? 0 : pseudoStyle->textShadow();
         }
 
         // Text shadows are disabled when printing. http://crbug.com/258321
         if (isPrinting)
             selectionStyle.shadow = 0;
     }
 
@@ skipping 41 matching lines @@
     DEFINE_STATIC_LOCAL(TextRun, placeholderTextRun, (&ideographicFullStop, 1));
     FloatPoint emphasisMarkTextOrigin(m_textBounds.x(), m_textBounds.y() + m_font.fontMetrics().ascent() + m_emphasisMarkOffset);
     TextRunPaintInfo textRunPaintInfo(placeholderTextRun);
     textRunPaintInfo.bounds = m_textBounds;
     m_graphicsContext->concatCTM(rotation(m_textBounds, Clockwise));
     m_graphicsContext->drawEmphasisMarks(m_combinedText->originalFont(), textRunPaintInfo, m_emphasisMark, emphasisMarkTextOrigin);
     m_graphicsContext->concatCTM(rotation(m_textBounds, Counterclockwise));
 }
 
 } // namespace blink