/* * 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 SVGTextLayoutAttributesBuilder_h #define SVGTextLayoutAttributesBuilder_h #include "core/rendering/svg/SVGTextLayoutAttributes.h" #include "wtf/Vector.h" namespace WebCore { class RenderObject; class RenderSVGInlineText; class RenderSVGText; class SVGTextPositioningElement; // SVGTextLayoutAttributesBuilder performs the first layout phase for SVG text. // // It extracts the x/y/dx/dy/rotate values from the SVGTextPositioningElements in the DOM. // These values are propagated to the corresponding RenderSVGInlineText renderers. // The first layout phase only extracts the relevant information needed in RenderBlockLineLayout // to create the InlineBox tree based on text chunk boundaries & BiDi information. // The second layout phase is carried out by SVGTextLayoutEngine. class SVGTextLayoutAttributesBuilder { WTF_MAKE_NONCOPYABLE(SVGTextLayoutAttributesBuilder); public: SVGTextLayoutAttributesBuilder(); bool buildLayoutAttributesForForSubtree(RenderSVGText*); void buildLayoutAttributesForTextRenderer(RenderSVGInlineText*); void rebuildMetricsForTextRenderer(RenderSVGInlineText*); // Invoked whenever the underlying DOM tree changes, so that m_textPositions is rebuild. void clearTextPositioningElements() { m_textPositions.clear(); } unsigned numberOfTextPositioningElements() const { return m_textPositions.size(); } private: struct TextPosition { TextPosition(SVGTextPositioningElement* newElement = 0, unsigned newStart = 0, unsigned newLength = 0) : element(newElement) , start(newStart) , length(newLength) { } SVGTextPositioningElement* element; unsigned start; unsigned length; }; void buildCharacterDataMap(RenderSVGText*); void collectTextPositioningElements(RenderObject*, UChar& lastCharacter); void fillCharacterDataMap(const TextPosition&); private: unsigned m_textLength; Vector<TextPosition> m_textPositions; SVGCharacterDataMap m_characterDataMap; }; } // namespace WebCore #endif