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/*
* 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
#if ENABLE(SVG)
#include "SVGTextMetricsBuilder.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*, const UChar*& lastCharacter);
void fillCharacterDataMap(const TextPosition&);
private:
unsigned m_textLength;
Vector<TextPosition> m_textPositions;
SVGCharacterDataMap m_characterDataMap;
SVGTextMetricsBuilder m_metricsBuilder;
};
} // namespace WebCore
#endif // ENABLE(SVG)
#endif
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