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 SVGTextMetrics_h
21#define SVGTextMetrics_h
22
23#include <wtf/text/WTFString.h>
24
25namespace WebCore {
26
27class RenderSVGInlineText;
28class SVGTextLayoutAttributes;
29class TextRun;
30
31class SVGTextMetrics {
32public:
33    enum MetricsType { SkippedSpaceMetrics };
34
35    SVGTextMetrics();
36    explicit SVGTextMetrics(MetricsType);
37    SVGTextMetrics(RenderSVGInlineText&, unsigned position, unsigned length, float width, const String& glyphName);
38
39    static SVGTextMetrics measureCharacterRange(RenderSVGInlineText&, unsigned position, unsigned length);
40    static TextRun constructTextRun(RenderSVGInlineText&, unsigned position = 0, unsigned length = std::numeric_limits<unsigned>::max());
41
42    bool isEmpty() const { return !m_width && !m_height && !m_glyph.isValid && m_length == 1; }
43
44    float width() const { return m_width; }
45    void setWidth(float width) { m_width = width; }
46
47    float height() const { return m_height; }
48    unsigned length() const { return m_length; }
49
50    struct Glyph {
51        Glyph()
52            : isValid(false)
53        {
54        }
55
56        bool operator==(const Glyph& other)
57        {
58            return isValid == other.isValid
59                && name == other.name
60                && unicodeString == other.unicodeString;
61        }
62
63        bool isValid;
64        String name;
65        String unicodeString;
66    };
67
68    // Only useful when measuring individual characters, to lookup ligatures.
69    const Glyph& glyph() const { return m_glyph; }
70
71private:
72    SVGTextMetrics(RenderSVGInlineText&, const TextRun&);
73
74    float m_width;
75    float m_height;
76    unsigned m_length;
77    Glyph m_glyph;
78};
79
80} // namespace WebCore
81
82#endif
83