2 * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
20 #ifndef SVGTextLayoutAttributesBuilder_h
21 #define SVGTextLayoutAttributesBuilder_h
23 #include "core/rendering/svg/SVGTextLayoutAttributes.h"
24 #include "wtf/Vector.h"
29 class RenderSVGInlineText;
31 class SVGTextPositioningElement;
33 // SVGTextLayoutAttributesBuilder performs the first layout phase for SVG text.
35 // It extracts the x/y/dx/dy/rotate values from the SVGTextPositioningElements in the DOM.
36 // These values are propagated to the corresponding RenderSVGInlineText renderers.
37 // The first layout phase only extracts the relevant information needed in RenderBlockLineLayout
38 // to create the InlineBox tree based on text chunk boundaries & BiDi information.
39 // The second layout phase is carried out by SVGTextLayoutEngine.
41 class SVGTextLayoutAttributesBuilder {
42 WTF_MAKE_NONCOPYABLE(SVGTextLayoutAttributesBuilder);
44 SVGTextLayoutAttributesBuilder();
45 bool buildLayoutAttributesForForSubtree(RenderSVGText*);
46 void buildLayoutAttributesForTextRenderer(RenderSVGInlineText*);
48 void rebuildMetricsForTextRenderer(RenderSVGInlineText*);
50 // Invoked whenever the underlying DOM tree changes, so that m_textPositions is rebuild.
51 void clearTextPositioningElements() { m_textPositions.clear(); }
52 unsigned numberOfTextPositioningElements() const { return m_textPositions.size(); }
56 TextPosition(SVGTextPositioningElement* newElement = 0, unsigned newStart = 0, unsigned newLength = 0)
63 SVGTextPositioningElement* element;
68 void buildCharacterDataMap(RenderSVGText*);
69 void collectTextPositioningElements(RenderObject*, UChar& lastCharacter);
70 void fillCharacterDataMap(const TextPosition&);
73 unsigned m_textLength;
74 Vector<TextPosition> m_textPositions;
75 SVGCharacterDataMap m_characterDataMap;
78 } // namespace WebCore