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 SVGTextLayoutAttributesBuilder_h 21 #define SVGTextLayoutAttributesBuilder_h 22 23 #include "core/rendering/svg/SVGTextLayoutAttributes.h" 24 #include "wtf/Vector.h" 25 26 namespace WebCore { 27 28 class RenderObject; 29 class RenderSVGInlineText; 30 class RenderSVGText; 31 class SVGTextPositioningElement; 32 33 // SVGTextLayoutAttributesBuilder performs the first layout phase for SVG text. 34 // 35 // It extracts the x/y/dx/dy/rotate values from the SVGTextPositioningElements in the DOM. 36 // These values are propagated to the corresponding RenderSVGInlineText renderers. 37 // The first layout phase only extracts the relevant information needed in RenderBlockLineLayout 38 // to create the InlineBox tree based on text chunk boundaries & BiDi information. 39 // The second layout phase is carried out by SVGTextLayoutEngine. 40 41 class SVGTextLayoutAttributesBuilder { 42 WTF_MAKE_NONCOPYABLE(SVGTextLayoutAttributesBuilder); 43 public: 44 SVGTextLayoutAttributesBuilder(); 45 bool buildLayoutAttributesForForSubtree(RenderSVGText*); 46 void buildLayoutAttributesForTextRenderer(RenderSVGInlineText*); 47 48 void rebuildMetricsForTextRenderer(RenderSVGInlineText*); 49 50 // Invoked whenever the underlying DOM tree changes, so that m_textPositions is rebuild. clearTextPositioningElements()51 void clearTextPositioningElements() { m_textPositions.clear(); } numberOfTextPositioningElements()52 unsigned numberOfTextPositioningElements() const { return m_textPositions.size(); } 53 54 private: 55 struct TextPosition { 56 TextPosition(SVGTextPositioningElement* newElement = 0, unsigned newStart = 0, unsigned newLength = 0) elementTextPosition57 : element(newElement) 58 , start(newStart) 59 , length(newLength) 60 { 61 } 62 63 SVGTextPositioningElement* element; 64 unsigned start; 65 unsigned length; 66 }; 67 68 void buildCharacterDataMap(RenderSVGText*); 69 void collectTextPositioningElements(RenderObject*, UChar& lastCharacter); 70 void fillCharacterDataMap(const TextPosition&); 71 72 private: 73 unsigned m_textLength; 74 Vector<TextPosition> m_textPositions; 75 SVGCharacterDataMap m_characterDataMap; 76 }; 77 78 } // namespace WebCore 79 80 #endif 81