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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
#include "core/layout/svg/SVGCharacterData.h"
#include "platform/heap/Handle.h"
#include "wtf/Allocator.h"
#include "wtf/Vector.h"
namespace blink {
class LayoutBoxModelObject;
class LayoutSVGText;
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
// LayoutSVGInlineText layoutObjects.
// The first layout phase only extracts the relevant information needed in
// LayoutBlockFlowLine to create the InlineBox tree based on text chunk
// boundaries & BiDi information.
// The second layout phase is carried out by SVGTextLayoutEngine.
class SVGTextLayoutAttributesBuilder {
STACK_ALLOCATED();
WTF_MAKE_NONCOPYABLE(SVGTextLayoutAttributesBuilder);
public:
explicit SVGTextLayoutAttributesBuilder(LayoutSVGText&);
void buildLayoutAttributes();
struct TextPosition {
DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
public:
TextPosition(SVGTextPositioningElement* newElement = nullptr,
unsigned newStart = 0,
unsigned newLength = 0)
: element(newElement), start(newStart), length(newLength) {}
DECLARE_TRACE();
Member<SVGTextPositioningElement> element;
unsigned start;
unsigned length;
};
private:
void buildCharacterDataMap(LayoutSVGText&);
void buildLayoutAttributes(LayoutSVGText&) const;
void collectTextPositioningElements(LayoutBoxModelObject&);
void fillCharacterDataMap(const TextPosition&);
LayoutSVGText& m_textRoot;
unsigned m_characterCount;
HeapVector<TextPosition> m_textPositions;
SVGCharacterDataMap m_characterDataMap;
};
} // namespace blink
WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(
blink::SVGTextLayoutAttributesBuilder::TextPosition);
#endif
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