WebCore/svg/SVGGlyphElement.h

   1 /*
   2    Copyright (C) 2007 Eric Seidel <eric@webkit.org>
   3    Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
   4    Copyright (C) 2008 Rob Buis <buis@kde.org>
   5
   6    This library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public
   8    License as published by the Free Software Foundation; either
   9    version 2 of the License, or (at your option) any later version.
  10
  11    This library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public License
  17    along with this library; see the file COPYING.LIB.  If not, write to
  18    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19    Boston, MA 02110-1301, USA.
  20  */
  21
  22 #ifndef SVGGlyphElement_h
  23 #define SVGGlyphElement_h
  24
  25 #if ENABLE(SVG_FONTS)
  26 #include "SVGStyledElement.h"
  27
  28 #include <limits>
  29 #include "Path.h"
  30
  31 namespace WebCore {
  32
  33     class AtomicString;
  34     class SVGFontData;
  35
  36     // Describe a SVG <glyph> element
  37     struct SVGGlyphIdentifier {
  38         enum Orientation {
  39             Vertical,
  40             Horizontal,
  41             Both
  42         };
  43
  44         // SVG Font depends on exactly this order.
  45         enum ArabicForm {
  46             None = 0,
  47             Isolated,
  48             Terminal,
  49             Initial,
  50             Medial
  51         };
  52
  53         SVGGlyphIdentifier()
  54             : isValid(false)
  55             , orientation(Both)
  56             , arabicForm(None)
  57             , priority(0)
  58             , nameLength(0)
  59             , horizontalAdvanceX(0.0f)
  60             , verticalOriginX(0.0f)
  61             , verticalOriginY(0.0f)
  62             , verticalAdvanceY(0.0f)
  63         {
  64         }
  65
  66         // Used to mark our float properties as "to be inherited from SVGFontData"
  67         static float inheritedValue()
  68         {
  69             static float s_inheritedValue = std::numeric_limits<float>::infinity();
  70             return s_inheritedValue;
  71         }
  72
  73         bool operator==(const SVGGlyphIdentifier& other) const
  74         {
  75             return isValid == other.isValid &&
  76                    orientation == other.orientation &&
  77                    arabicForm == other.arabicForm &&
  78                    glyphName == other.glyphName &&
  79                    horizontalAdvanceX == other.horizontalAdvanceX &&
  80                    verticalOriginX == other.verticalOriginX &&
  81                    verticalOriginY == other.verticalOriginY &&
  82                    verticalAdvanceY == other.verticalAdvanceY &&
  83                    pathData.debugString() == other.pathData.debugString() &&
  84                    languages == other.languages;
  85         }
  86
  87         bool isValid : 1;
  88
  89         unsigned orientation : 2; // Orientation
  90         unsigned arabicForm : 3;  // ArabicForm
  91         int priority;
  92         size_t nameLength;
  93         String glyphName;
  94
  95         float horizontalAdvanceX;
  96         float verticalOriginX;
  97         float verticalOriginY;
  98         float verticalAdvanceY;
  99
 100         Path pathData;
 101         Vector<String> languages;
 102     };
 103
 104     class SVGGlyphElement : public SVGStyledElement {
 105     public:
 106         SVGGlyphElement(const QualifiedName&, Document*);
 107         virtual ~SVGGlyphElement();
 108
 109         virtual void parseMappedAttribute(MappedAttribute*);
 110
 111         virtual void insertedIntoDocument();
 112         virtual void removedFromDocument();
 113
 114         virtual bool rendererIsNeeded(RenderStyle*) { return false; }
 115
 116         SVGGlyphIdentifier buildGlyphIdentifier() const;
 117
 118         // Helper function used by SVGFont
 119         static void inheritUnspecifiedAttributes(SVGGlyphIdentifier&, const SVGFontData*);
 120         static String querySVGFontLanguage(const SVGElement*);
 121
 122         // Helper function shared between SVGGlyphElement & SVGMissingGlyphElement
 123         static SVGGlyphIdentifier buildGenericGlyphIdentifier(const SVGElement*);
 124     private:
 125         void invalidateGlyphCache();
 126     };
 127
 128 } // namespace WebCore
 129
 130 #endif // ENABLE(SVG_FONTS)
 131 #endif