1/*
2 * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved.
3 *
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.
8 *
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.
13 *
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.
18 */
19
20#ifndef SVGTextMetricsBuilder_h
21#define SVGTextMetricsBuilder_h
22
23#include "SVGTextLayoutAttributes.h"
24#include "TextRun.h"
25#include "WidthIterator.h"
26
27namespace WebCore {
28
29class RenderElement;
30class RenderSVGInlineText;
31class RenderSVGText;
32struct MeasureTextData;
33
34class SVGTextMetricsBuilder {
35    WTF_MAKE_NONCOPYABLE(SVGTextMetricsBuilder);
36public:
37    SVGTextMetricsBuilder();
38    void measureTextRenderer(RenderSVGInlineText*);
39    void buildMetricsAndLayoutAttributes(RenderSVGText*, RenderSVGInlineText* stopAtLeaf, SVGCharacterDataMap& allCharactersMap);
40
41private:
42    bool advance();
43    void advanceSimpleText();
44    void advanceComplexText();
45    bool currentCharacterStartsSurrogatePair() const;
46
47    void initializeMeasurementWithTextRenderer(RenderSVGInlineText*);
48    void walkTree(RenderElement&, RenderSVGInlineText* stopAtLeaf, MeasureTextData*);
49    void measureTextRenderer(RenderSVGInlineText*, MeasureTextData*);
50
51    RenderSVGInlineText* m_text;
52    TextRun m_run;
53    unsigned m_textPosition;
54    bool m_isComplexText;
55    SVGTextMetrics m_currentMetrics;
56    float m_totalWidth;
57
58    // Simple text only.
59    std::unique_ptr<WidthIterator> m_simpleWidthIterator;
60
61    // Complex text only.
62    SVGTextMetrics m_complexStartToCurrentMetrics;
63};
64
65} // namespace WebCore
66
67#endif
68