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/*
* Copyright (C) Research In Motion Limited 2010. 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 "SVGTextLayoutAttributes.h"
#include <wtf/Vector.h>
namespace WebCore {
class RenderObject;
class RenderSVGText;
// SVGTextLayoutAttributesBuilder performs the first layout phase for SVG text.
//
// It extracts the x/y/dx/dy/rotate values from the SVGTextPositioningElements in the DOM,
// measures all characters in the RenderSVGText subtree and extracts kerning/ligature information.
// 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 : public Noncopyable {
public:
SVGTextLayoutAttributesBuilder();
void buildLayoutAttributesForTextSubtree(RenderSVGText*);
private:
struct LayoutScope {
LayoutScope()
: textContentStart(0)
, textContentLength(0)
{
}
unsigned textContentStart;
unsigned textContentLength;
SVGTextLayoutAttributes attributes;
};
void buildLayoutScope(LayoutScope&, RenderObject*, unsigned textContentStart, unsigned textContentLength) const;
void buildLayoutScopes(RenderObject*, unsigned& atCharacter, UChar& lastCharacter);
void buildOutermostLayoutScope(RenderSVGText*, unsigned textLength);
void propagateLayoutAttributes(RenderObject*, unsigned& atCharacter, UChar& lastCharacter) const;
enum LayoutValueType {
XValueAttribute,
YValueAttribute,
DxValueAttribute,
DyValueAttribute,
RotateValueAttribute
};
float nextLayoutValue(LayoutValueType, unsigned atCharacter) const;
void assignLayoutAttributesForCharacter(SVGTextLayoutAttributes&, SVGTextMetrics&, unsigned valueListPosition) const;
void assignEmptyLayoutAttributesForCharacter(SVGTextLayoutAttributes&) const;
private:
Vector<LayoutScope> m_scopes;
};
} // namespace WebCore
#endif // ENABLE(SVG)
#endif
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