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/*
* Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
*
* 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 SVGCharacterLayoutInfo_h
#define SVGCharacterLayoutInfo_h
#if ENABLE(SVG)
#include "Path.h"
#include <wtf/Assertions.h>
#include <wtf/Vector.h>
namespace WebCore {
class InlineFlowBox;
class SVGElement;
class SVGLengthList;
class SVGNumberList;
class SVGTextPositioningElement;
template<class Type>
class PositionedVector : public Vector<Type> {
public:
PositionedVector<Type>()
: m_position(0)
{
}
unsigned position() const
{
return m_position;
}
void advance(unsigned position)
{
m_position += position;
ASSERT(m_position < Vector<Type>::size());
}
Type valueAtCurrentPosition() const
{
ASSERT(m_position < Vector<Type>::size());
return Vector<Type>::at(m_position);
}
private:
unsigned m_position;
};
class PositionedFloatVector : public PositionedVector<float> { };
struct SVGChar;
struct SVGCharacterLayoutInfo {
SVGCharacterLayoutInfo();
enum StackType { XStack, YStack, DxStack, DyStack, AngleStack, BaselineShiftStack };
bool xValueAvailable() const;
bool yValueAvailable() const;
bool dxValueAvailable() const;
bool dyValueAvailable() const;
bool angleValueAvailable() const;
bool baselineShiftValueAvailable() const;
float xValueNext() const;
float yValueNext() const;
float dxValueNext() const;
float dyValueNext() const;
float angleValueNext() const;
float baselineShiftValueNext() const;
void processedChunk(float savedShiftX, float savedShiftY);
void processedSingleCharacter();
bool nextPathLayoutPointAndAngle(float glyphAdvance, float extraAdvance, float newOffset);
// Used for text-on-path.
void addLayoutInformation(InlineFlowBox*, float textAnchorOffset = 0.0f);
bool inPathLayout() const;
void setInPathLayout(bool value);
// Used for anything else.
void addLayoutInformation(SVGTextPositioningElement*);
// Global position
float curx;
float cury;
// Global rotation
float angle;
// Accumulated dx/dy values
float dx;
float dy;
// Accumulated baseline-shift values
float shiftx;
float shifty;
// Path specific advance values to handle lengthAdjust
float pathExtraAdvance;
float pathTextLength;
float pathChunkLength;
// Result vector
Vector<SVGChar> svgChars;
bool nextDrawnSeperated : 1;
private:
// Used for baseline-shift.
void addStackContent(StackType, float);
// Used for angle.
void addStackContent(StackType, SVGNumberList*);
// Used for x/y/dx/dy.
void addStackContent(StackType, SVGLengthList*, const SVGElement*);
void addStackContent(StackType, const PositionedFloatVector&);
void xStackWalk();
void yStackWalk();
void dxStackWalk();
void dyStackWalk();
void angleStackWalk();
void baselineShiftStackWalk();
bool isInitialLayout() const;
private:
bool xStackChanged : 1;
bool yStackChanged : 1;
bool dxStackChanged : 1;
bool dyStackChanged : 1;
bool angleStackChanged : 1;
bool baselineShiftStackChanged : 1;
// text on path layout
bool pathLayout : 1;
float currentOffset;
float startOffset;
float layoutPathLength;
Path layoutPath;
Vector<PositionedFloatVector> xStack;
Vector<PositionedFloatVector> yStack;
Vector<PositionedFloatVector> dxStack;
Vector<PositionedFloatVector> dyStack;
Vector<PositionedFloatVector> angleStack;
Vector<float> baselineShiftStack;
};
} // namespace WebCore
#endif // ENABLE(SVG)
#endif // SVGCharacterLayoutInfo_h
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