1 /*
2  * Copyright (C) Research In Motion Limited 2010. 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 #if ENABLE(SVG)
24 #include <wtf/text/WTFString.h>
25 
26 namespace WebCore {
27 
28 class RenderSVGInlineText;
29 class TextRun;
30 
31 class SVGTextMetrics {
32 public:
33     static SVGTextMetrics emptyMetrics();
34     static SVGTextMetrics measureCharacterRange(RenderSVGInlineText*, unsigned position, unsigned length);
35 
36     bool operator==(const SVGTextMetrics&);
37 
width()38     float width() const { return m_width; }
height()39     float height() const { return m_height; }
length()40     unsigned length() const { return m_length; }
41 
42     struct Glyph {
GlyphGlyph43         Glyph()
44             : isValid(false)
45         {
46         }
47 
48         bool operator==(const Glyph& other)
49         {
50             return isValid == other.isValid
51                 && name == other.name
52                 && unicodeString == other.unicodeString;
53         }
54 
55         bool isValid;
56         String name;
57         String unicodeString;
58     };
59 
60     // Only useful when measuring individual characters, to lookup ligatures.
glyph()61     const Glyph& glyph() const { return m_glyph; }
62 
63 private:
64     friend class SVGTextLayoutAttributesBuilder;
setWidth(float width)65     void setWidth(float width) { m_width = width; }
66 
67 private:
68     SVGTextMetrics();
69     SVGTextMetrics(RenderSVGInlineText*, const TextRun&, unsigned position, unsigned textLength);
70 
71     float m_width;
72     float m_height;
73     unsigned m_length;
74     Glyph m_glyph;
75 };
76 
77 } // namespace WebCore
78 
79 #endif // ENABLE(SVG)
80 #endif
81