khtml/svg/SVGGlyphElement.h

   1 /*
   2    Copyright (C) 2007 Eric Seidel <eric@webkit.org>
   3    Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
   4
   5    This library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public
   7    License as published by the Free Software Foundation; either
   8    version 2 of the License, or (at your option) any later version.
   9
  10    This library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public License
  16    along with this library; see the file COPYING.LIB.  If not, write to
  17    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18    Boston, MA 02110-1301, USA.
  19  */
  20
  21 #ifndef SVGGlyphElement_h
  22 #define SVGGlyphElement_h
  23
  24 #if ENABLE(SVG_FONTS)
  25 #include "SVGStyledElement.h"
  26
  27 #include <limits>
  28 #include "Path.h"
  29
  30 namespace khtml
  31 {
  32     class AtomicString;
  33 }
  34
  35 namespace WebCore {
  36
  37     using khtml::AtomicString;
  38     struct SVGFontData;
  39
  40     // Describe a SVG <glyph> element
  41     struct SVGGlyphIdentifier {
  42         enum Orientation {
  43             Vertical,
  44             Horizontal,
  45             Both
  46         };
  47
  48         // SVG Font depends on exactly this order.
  49         enum ArabicForm {
  50             None = 0,
  51             Isolated,
  52             Terminal,
  53             Initial,
  54             Medial
  55         };
  56
  57         SVGGlyphIdentifier()
  58             : isValid(false)
  59             , orientation(Both)
  60             , arabicForm(None)
  61             , priority(0)
  62             , nameLength(0)
  63             , horizontalAdvanceX(0.0f)
  64             , verticalOriginX(0.0f)
  65             , verticalOriginY(0.0f)
  66             , verticalAdvanceY(0.0f)
  67         {
  68         }
  69
  70         // Used to mark our float properties as "to be inherited from SVGFontData"
  71         static float inheritedValue()
  72         {
  73             static float s_inheritedValue = std::numeric_limits<float>::infinity();
  74             return s_inheritedValue;
  75         }
  76
  77         bool operator==(const SVGGlyphIdentifier& other) const
  78         {
  79             return isValid == other.isValid &&
  80                    orientation == other.orientation &&
  81                    arabicForm == other.arabicForm &&
  82                    glyphName == other.glyphName &&
  83                    horizontalAdvanceX == other.horizontalAdvanceX &&
  84                    verticalOriginX == other.verticalOriginX &&
  85                    verticalOriginY == other.verticalOriginY &&
  86                    verticalAdvanceY == other.verticalAdvanceY &&
  87                    pathData.debugString() == other.pathData.debugString() &&
  88                    languages == other.languages;
  89         }
  90
  91         bool isValid : 1;
  92
  93         Orientation orientation : 2;
  94         ArabicForm arabicForm : 3;
  95         int priority;
  96         size_t nameLength;
  97         String glyphName;
  98
  99         float horizontalAdvanceX;
 100         float verticalOriginX;
 101         float verticalOriginY;
 102         float verticalAdvanceY;
 103
 104         Path pathData;
 105         Vector<String> languages;
 106     };
 107
 108     class SVGGlyphElement : public SVGStyledElement {
 109     public:
 110         SVGGlyphElement(const QualifiedName&, Document*);
 111         virtual ~SVGGlyphElement();
 112
 113         virtual void insertedIntoDocument();
 114         virtual void removedFromDocument();
 115
 116         virtual bool rendererIsNeeded(RenderStyle*) { return false; }
 117
 118         SVGGlyphIdentifier buildGlyphIdentifier() const;
 119
 120         // Helper function used by SVGFont
 121         static void inheritUnspecifiedAttributes(SVGGlyphIdentifier&, const SVGFontData*);
 122         static String querySVGFontLanguage(const SVGElement*);
 123
 124         // Helper function shared between SVGGlyphElement & SVGMissingGlyphElement
 125         static SVGGlyphIdentifier buildGenericGlyphIdentifier(const SVGElement*);
 126     };
 127
 128 } // namespace WebCore
 129
 130 #endif // ENABLE(SVG_FONTS)
 131 #endif