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 "SVGTextLayoutAttributes.h" 24#include "TextRun.h" 25#include "WidthIterator.h" 26 27namespace WebCore { 28 29class RenderElement; 30class RenderSVGInlineText; 31class RenderSVGText; 32struct MeasureTextData; 33 34class SVGTextMetricsBuilder { 35 WTF_MAKE_NONCOPYABLE(SVGTextMetricsBuilder); 36public: 37 SVGTextMetricsBuilder(); 38 void measureTextRenderer(RenderSVGInlineText*); 39 void buildMetricsAndLayoutAttributes(RenderSVGText*, RenderSVGInlineText* stopAtLeaf, SVGCharacterDataMap& allCharactersMap); 40 41private: 42 bool advance(); 43 void advanceSimpleText(); 44 void advanceComplexText(); 45 bool currentCharacterStartsSurrogatePair() const; 46 47 void initializeMeasurementWithTextRenderer(RenderSVGInlineText*); 48 void walkTree(RenderElement&, RenderSVGInlineText* stopAtLeaf, MeasureTextData*); 49 void measureTextRenderer(RenderSVGInlineText*, MeasureTextData*); 50 51 RenderSVGInlineText* m_text; 52 TextRun m_run; 53 unsigned m_textPosition; 54 bool m_isComplexText; 55 SVGTextMetrics m_currentMetrics; 56 float m_totalWidth; 57 58 // Simple text only. 59 std::unique_ptr<WidthIterator> m_simpleWidthIterator; 60 61 // Complex text only. 62 SVGTextMetrics m_complexStartToCurrentMetrics; 63}; 64 65} // namespace WebCore 66 67#endif 68