Factor out the <textPath> positioning mapping code into a helper class

third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngine.h

 /*
  * Copyright (C) Research In Motion Limited 2010-2012. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef SVGTextLayoutEngine_h
 #define SVGTextLayoutEngine_h
 
 #include "core/layout/api/LineLayoutSVGInlineText.h"
 #include "core/layout/svg/LayoutSVGInlineText.h"
 #include "core/layout/svg/SVGTextFragment.h"
 #include "core/layout/svg/SVGTextLayoutAttributes.h"
 #include "core/layout/svg/SVGTextMetrics.h"
-#include "platform/graphics/Path.h"
 #include "wtf/Allocator.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class ComputedStyle;
 class InlineFlowBox;
 class LayoutObject;
+class PathPositionMapper;
 class SVGInlineFlowBox;
 class SVGInlineTextBox;
 
 // SVGTextLayoutEngine performs the second layout phase for SVG text.
 //
 // The InlineBox tree was created, containing the text chunk information, necessary to apply
 // certain SVG specific text layout properties (text-length adjustments and text-anchor).
 // The second layout phase uses the SVGTextLayoutAttributes stored in the individual
 // LayoutSVGInlineText layoutObjects to compute the final positions for each character
 // which are stored in the SVGInlineTextBox objects.
 
 class SVGTextLayoutEngine {
     STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngine);
 public:
     SVGTextLayoutEngine(Vector<SVGTextLayoutAttributes*>&);
+    ~SVGTextLayoutEngine();
 
     Vector<SVGTextLayoutAttributes*>& layoutAttributes() { return m_layoutAttributes; }
 
     void layoutCharactersInTextBoxes(InlineFlowBox* start);
     void finishLayout();
 
 private:
     void updateCharacterPositionIfNeeded(float& x, float& y);
     void updateCurrentTextPosition(float x, float y, float glyphAdvance);
     void updateRelativePositionAdjustmentsIfNeeded(float dx, float dy);
@@ skipping 22 matching lines @@
     SVGInlineTextMetricsIterator m_visualMetricsIterator;
     float m_x;
     float m_y;
     float m_dx;
     float m_dy;
     bool m_isVerticalText;
     bool m_inPathLayout;
     bool m_textLengthSpacingInEffect;
 
     // Text on path layout
-    Path::PositionCalculator* m_textPathCalculator;
-    float m_textPathLength;
+    OwnPtr<PathPositionMapper> m_textPath;
     float m_textPathStartOffset;
     float m_textPathCurrentOffset;
     float m_textPathSpacing;
     float m_textPathScaling;
 };
 
 } // namespace blink
 
 #endif