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      1 /*
      2  * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #ifndef SVGTextMetricsBuilder_h
     21 #define SVGTextMetricsBuilder_h
     22 
     23 #include "core/rendering/svg/SVGTextLayoutAttributes.h"
     24 #include "core/rendering/svg/SVGTextMetrics.h"
     25 #include "platform/fonts/WidthIterator.h"
     26 #include "platform/text/TextRun.h"
     27 #include "wtf/Vector.h"
     28 
     29 namespace WebCore {
     30 
     31 class RenderObject;
     32 class RenderSVGInlineText;
     33 class RenderSVGText;
     34 struct MeasureTextData;
     35 
     36 class SVGTextMetricsBuilder {
     37     WTF_MAKE_NONCOPYABLE(SVGTextMetricsBuilder);
     38 public:
     39     SVGTextMetricsBuilder();
     40     void measureTextRenderer(RenderSVGInlineText*);
     41     void buildMetricsAndLayoutAttributes(RenderSVGText*, RenderSVGInlineText* stopAtLeaf, SVGCharacterDataMap& allCharactersMap);
     42 
     43 private:
     44     bool advance();
     45     void advanceSimpleText();
     46     void advanceComplexText();
     47     bool currentCharacterStartsSurrogatePair() const;
     48 
     49     void initializeMeasurementWithTextRenderer(RenderSVGInlineText*);
     50     void walkTree(RenderObject*, RenderSVGInlineText* stopAtLeaf, MeasureTextData*);
     51     void measureTextRenderer(RenderSVGInlineText*, MeasureTextData*);
     52 
     53     RenderSVGInlineText* m_text;
     54     TextRun m_run;
     55     unsigned m_textPosition;
     56     bool m_isComplexText;
     57     SVGTextMetrics m_currentMetrics;
     58     float m_totalWidth;
     59 
     60     // Simple text only.
     61     OwnPtr<WidthIterator> m_simpleWidthIterator;
     62 
     63     // Complex text only.
     64     SVGTextMetrics m_complexStartToCurrentMetrics;
     65 };
     66 
     67 } // namespace WebCore
     68 
     69 #endif
     70