SVGTextLayoutEngine.h [plain text]
#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;
class SVGTextLayoutEngine {
WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngine);
public:
SVGTextLayoutEngine(Vector<SVGTextLayoutAttributes>&);
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(Vector<float>& dxValues, Vector<float>& dyValues);
void recordTextFragment(SVGInlineTextBox*, Vector<SVGTextMetrics>& textMetricValues);
bool parentDefinesTextLength(RenderObject*) const;
void layoutTextOnLineOrPath(SVGInlineTextBox*, RenderSVGInlineText*, const RenderStyle*);
void finalizeTransformMatrices(Vector<SVGInlineTextBox*>&);
bool currentLogicalCharacterAttributes(SVGTextLayoutAttributes&);
bool currentLogicalCharacterMetrics(SVGTextLayoutAttributes&, SVGTextMetrics&);
bool currentVisualCharacterMetrics(SVGInlineTextBox*, RenderSVGInlineText*, 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_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;
Path m_textPath;
float m_textPathLength;
float m_textPathStartOffset;
float m_textPathCurrentOffset;
float m_textPathSpacing;
float m_textPathScaling;
};
}
#endif // ENABLE(SVG)
#endif