107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
/*
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* Copyright (C) Research In Motion Limited 2010-2012. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include "Path.h"
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#include "SVGTextChunkBuilder.h"
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#include "SVGTextFragment.h"
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#include "SVGTextLayoutAttributes.h"
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namespace WebCore {
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class RenderObject;
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class RenderStyle;
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class RenderSVGInlineText;
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class RenderSVGTextPath;
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class SVGElement;
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class SVGInlineTextBox;
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class SVGRenderStyle;
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// SVGTextLayoutEngine performs the second layout phase for SVG text.
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//
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// The InlineBox tree was created, containing the text chunk information, necessary to apply
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// certain SVG specific text layout properties (text-length adjustments and text-anchor).
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// The second layout phase uses the SVGTextLayoutAttributes stored in the individual
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// RenderSVGInlineText renderers to compute the final positions for each character
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// which are stored in the SVGInlineTextBox objects.
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class SVGTextLayoutEngine {
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WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngine);
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public:
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SVGTextLayoutEngine(Vector<SVGTextLayoutAttributes*>&);
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Vector<SVGTextLayoutAttributes*>& layoutAttributes() { return m_layoutAttributes; }
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SVGTextChunkBuilder& chunkLayoutBuilder() { return m_chunkLayoutBuilder; }
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void beginTextPathLayout(RenderSVGTextPath&, SVGTextLayoutEngine& lineLayout);
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void endTextPathLayout();
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void layoutInlineTextBox(SVGInlineTextBox&);
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void finishLayout();
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private:
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void updateCharacerPositionIfNeeded(float& x, float& y);
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void updateCurrentTextPosition(float x, float y, float glyphAdvance);
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void updateRelativePositionAdjustmentsIfNeeded(float dx, float dy);
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void recordTextFragment(SVGInlineTextBox&, Vector<SVGTextMetrics>&);
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bool parentDefinesTextLength(RenderObject*) const;
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void layoutTextOnLineOrPath(SVGInlineTextBox&, RenderSVGInlineText&, const RenderStyle&);
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void finalizeTransformMatrices(Vector<SVGInlineTextBox*>&);
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bool currentLogicalCharacterAttributes(SVGTextLayoutAttributes*&);
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bool currentLogicalCharacterMetrics(SVGTextLayoutAttributes*&, SVGTextMetrics&);
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bool currentVisualCharacterMetrics(const SVGInlineTextBox&, Vector<SVGTextMetrics>&, SVGTextMetrics&);
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void advanceToNextLogicalCharacter(const SVGTextMetrics&);
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void advanceToNextVisualCharacter(const SVGTextMetrics&);
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private:
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Vector<SVGTextLayoutAttributes*>& m_layoutAttributes;
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Vector<SVGInlineTextBox*> m_lineLayoutBoxes;
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Vector<SVGInlineTextBox*> m_pathLayoutBoxes;
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SVGTextChunkBuilder m_chunkLayoutBuilder;
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SVGTextFragment m_currentTextFragment;
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unsigned m_layoutAttributesPosition;
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unsigned m_logicalCharacterOffset;
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unsigned m_logicalMetricsListOffset;
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unsigned m_visualCharacterOffset;
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unsigned m_visualMetricsListOffset;
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float m_x;
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float m_y;
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float m_dx;
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float m_dy;
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bool m_isVerticalText;
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bool m_inPathLayout;
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// Text on path layout
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Path m_textPath;
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float m_textPathLength;
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float m_textPathStartOffset;
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float m_textPathCurrentOffset;
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float m_textPathSpacing;
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float m_textPathScaling;
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};
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} // namespace WebCore
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