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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 SVGTextLayoutEngine_h
#define SVGTextLayoutEngine_h
#if ENABLE(SVG)
#include "Path.h"
#include "SVGTextChunkBuilder.h"
#include "SVGTextFragment.h"
#include "SVGTextLayoutAttributes.h"
#include "SVGTextMetrics.h"
#include <wtf/Vector.h>
namespace WebCore {
class RenderObject;
class RenderStyle;
class RenderSVGInlineText;
class SVGElement;
class SVGInlineTextBox;
class SVGRenderStyle;
// SVGTextLayoutEngine performs the second layout phase for SVG text.
//
// The InlineBox tree was created, containing the text chunk information, necessary to apply
// certain SVG specific text layout properties (text-length adjustments and text-anchor).
// The second layout phase uses the SVGTextLayoutAttributes stored in the individual
// RenderSVGInlineText renderers to compute the final positions for each character
// which are stored in the SVGInlineTextBox objects.
class SVGTextLayoutEngine {
WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngine);
public:
SVGTextLayoutEngine(Vector<SVGTextLayoutAttributes*>&);
Vector<SVGTextLayoutAttributes*>& layoutAttributes() { return m_layoutAttributes; }
SVGTextChunkBuilder& chunkLayoutBuilder() { return m_chunkLayoutBuilder; }
void beginTextPathLayout(RenderObject*, SVGTextLayoutEngine& lineLayout);
void endTextPathLayout();
void layoutInlineTextBox(SVGInlineTextBox*);
void finishLayout();
private:
void updateCharacerPositionIfNeeded(float& x, float& y);
void updateCurrentTextPosition(float x, float y, float glyphAdvance);
void updateRelativePositionAdjustmentsIfNeeded(float dx, float dy);
void recordTextFragment(SVGInlineTextBox*, Vector<SVGTextMetrics>&);
bool parentDefinesTextLength(RenderObject*) const;
void layoutTextOnLineOrPath(SVGInlineTextBox*, RenderSVGInlineText*, const RenderStyle*);
void finalizeTransformMatrices(Vector<SVGInlineTextBox*>&);
bool currentLogicalCharacterAttributes(SVGTextLayoutAttributes*&);
bool currentLogicalCharacterMetrics(SVGTextLayoutAttributes*&, SVGTextMetrics&);
bool currentVisualCharacterMetrics(SVGInlineTextBox*, Vector<SVGTextMetrics>&, SVGTextMetrics&);
void advanceToNextLogicalCharacter(const SVGTextMetrics&);
void advanceToNextVisualCharacter(const SVGTextMetrics&);
private:
Vector<SVGTextLayoutAttributes*>& m_layoutAttributes;
Vector<SVGInlineTextBox*> m_lineLayoutBoxes;
Vector<SVGInlineTextBox*> m_pathLayoutBoxes;
SVGTextChunkBuilder m_chunkLayoutBuilder;
SVGTextFragment m_currentTextFragment;
unsigned m_layoutAttributesPosition;
unsigned m_logicalCharacterOffset;
unsigned m_logicalMetricsListOffset;
unsigned m_visualCharacterOffset;
unsigned m_visualMetricsListOffset;
float m_x;
float m_y;
float m_dx;
float m_dy;
bool m_isVerticalText;
bool m_inPathLayout;
// Text on path layout
Path m_textPath;
float m_textPathLength;
float m_textPathStartOffset;
float m_textPathCurrentOffset;
float m_textPathSpacing;
float m_textPathScaling;
};
} // namespace WebCore
#endif // ENABLE(SVG)
#endif
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