Home | History | Annotate | Download | only in svg 
      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 
     25 namespace WebCore {
     26 
     27 class RenderSVGInlineText;
     28 class SVGTextLayoutAttributes;
     29 class TextRun;
     30 
     31 class SVGTextMetrics {
     32 public:
     33     enum MetricsType {
     34         SkippedSpaceMetrics
     35     };
     36 
     37     SVGTextMetrics();
     38     SVGTextMetrics(MetricsType);
     39     SVGTextMetrics(RenderSVGInlineText*, unsigned position, unsigned length, float width, const String& glyphName);
     40 
     41     static SVGTextMetrics measureCharacterRange(RenderSVGInlineText*, unsigned position, unsigned length);
     42     static TextRun constructTextRun(RenderSVGInlineText*, unsigned position, unsigned length);
     43 
     44     bool isEmpty() const { return !m_width && !m_height && !m_glyph.isValid && m_length == 1; }
     45 
     46     float width() const { return m_width; }
     47     void setWidth(float width) { m_width = width; }
     48 
     49     float height() const { return m_height; }
     50     unsigned length() const { return m_length; }
     51 
     52     struct Glyph {
     53         Glyph()
     54             : isValid(false)
     55         {
     56         }
     57 
     58         bool operator==(const Glyph& other)
     59         {
     60             return isValid == other.isValid
     61                 && name == other.name
     62                 && unicodeString == other.unicodeString;
     63         }
     64 
     65         bool isValid;
     66         String name;
     67         String unicodeString;
     68     };
     69 
     70     // Only useful when measuring individual characters, to lookup ligatures.
     71     const Glyph& glyph() const { return m_glyph; }
     72 
     73 private:
     74     SVGTextMetrics(RenderSVGInlineText*, const TextRun&);
     75 
     76     float m_width;
     77     float m_height;
     78     unsigned m_length;
     79     Glyph m_glyph;
     80 };
     81 
     82 } // namespace WebCore
     83 
     84 #endif
     85