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      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 
     38     float width() const { return m_width; }
     39     float height() const { return m_height; }
     40     unsigned length() const { return m_length; }
     41 
     42     struct Glyph {
     43         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.
     61     const Glyph& glyph() const { return m_glyph; }
     62 
     63 private:
     64     friend class SVGTextLayoutAttributesBuilder;
     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