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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 SVGTextChunkBuilder_h
#define SVGTextChunkBuilder_h
#include "wtf/Allocator.h"
#include "wtf/Vector.h"
namespace blink {
class SVGInlineTextBox;
struct SVGTextFragment;
// SVGTextChunkBuilder performs the third layout phase for SVG text.
//
// Phase one built the layout information from the SVG DOM stored in the
// LayoutSVGInlineText objects (SVGTextLayoutAttributes).
// Phase two performed the actual per-character layout, computing the final
// positions for each character, stored in the SVGInlineTextBox objects
// (SVGTextFragment).
// Phase three performs all modifications that have to be applied to each
// individual text chunk (text-anchor & textLength).
class SVGTextChunkBuilder {
STACK_ALLOCATED();
WTF_MAKE_NONCOPYABLE(SVGTextChunkBuilder);
public:
SVGTextChunkBuilder();
void processTextChunks(const Vector<SVGInlineTextBox*>&);
protected:
typedef Vector<SVGInlineTextBox*>::const_iterator BoxListConstIterator;
virtual void handleTextChunk(BoxListConstIterator boxStart,
BoxListConstIterator boxEnd);
private:
void processTextLengthSpacingCorrection(bool isVerticalText,
float textLengthShift,
Vector<SVGTextFragment>&,
unsigned& atCharacter);
void applyTextLengthScaleAdjustment(float textLengthScale,
float textLengthBias,
Vector<SVGTextFragment>&);
void processTextAnchorCorrection(bool isVerticalText,
float textAnchorShift,
Vector<SVGTextFragment>&);
};
class SVGTextPathChunkBuilder final : public SVGTextChunkBuilder {
STACK_ALLOCATED();
WTF_MAKE_NONCOPYABLE(SVGTextPathChunkBuilder);
public:
SVGTextPathChunkBuilder();
float totalLength() const { return m_totalLength; }
unsigned totalCharacters() const { return m_totalCharacters; }
float totalTextAnchorShift() const { return m_totalTextAnchorShift; }
private:
void handleTextChunk(BoxListConstIterator boxStart,
BoxListConstIterator boxEnd) override;
float m_totalLength;
unsigned m_totalCharacters;
float m_totalTextAnchorShift;
};
} // namespace blink
#endif
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