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SVGGlyphElement.h

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00001 /*
00002    Copyright (C) 2007 Eric Seidel <eric@webkit.org>
00003    Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
00004 
00005    This library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Library General Public
00007    License as published by the Free Software Foundation; either
00008    version 2 of the License, or (at your option) any later version.
00009 
00010    This library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Library General Public License for more details.
00014 
00015    You should have received a copy of the GNU Library General Public License
00016    along with this library; see the file COPYING.LIB.  If not, write to
00017    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00018    Boston, MA 02110-1301, USA.
00019  */
00020 
00021 #ifndef SVGGlyphElement_h
00022 #define SVGGlyphElement_h
00023 
00024 #if ENABLE(SVG_FONTS)
00025 #include "SVGStyledElement.h"
00026 
00027 #include <limits>
00028 #include "Path.h"
00029 
00030 namespace khtml
00031 {
00032     class AtomicString;
00033 }
00034 
00035 namespace WebCore {
00036 
00037     using khtml::AtomicString;
00038     struct SVGFontData;
00039 
00040     // Describe a SVG <glyph> element
00041     struct SVGGlyphIdentifier {
00042         enum Orientation {
00043             Vertical,
00044             Horizontal,
00045             Both
00046         };
00047 
00048         // SVG Font depends on exactly this order.
00049         enum ArabicForm {
00050             None = 0,
00051             Isolated,
00052             Terminal,
00053             Initial,
00054             Medial
00055         };
00056 
00057         SVGGlyphIdentifier()
00058             : isValid(false)
00059             , orientation(Both)
00060             , arabicForm(None)
00061             , priority(0)
00062             , nameLength(0)
00063             , horizontalAdvanceX(0.0f)
00064             , verticalOriginX(0.0f)
00065             , verticalOriginY(0.0f)
00066             , verticalAdvanceY(0.0f)
00067         {
00068         }
00069 
00070         // Used to mark our float properties as "to be inherited from SVGFontData"
00071         static float inheritedValue()
00072         {
00073             static float s_inheritedValue = std::numeric_limits<float>::infinity();
00074             return s_inheritedValue;
00075         }
00076 
00077         bool operator==(const SVGGlyphIdentifier& other) const
00078         {
00079             return isValid == other.isValid &&
00080                    orientation == other.orientation &&
00081                    arabicForm == other.arabicForm &&
00082                    glyphName == other.glyphName &&
00083                    horizontalAdvanceX == other.horizontalAdvanceX &&
00084                    verticalOriginX == other.verticalOriginX &&
00085                    verticalOriginY == other.verticalOriginY &&
00086                    verticalAdvanceY == other.verticalAdvanceY &&
00087                    pathData.debugString() == other.pathData.debugString() &&
00088                    languages == other.languages;
00089         }
00090 
00091         bool isValid : 1;
00092 
00093         Orientation orientation : 2;
00094         ArabicForm arabicForm : 3;
00095         int priority;
00096         size_t nameLength;
00097         String glyphName;
00098 
00099         float horizontalAdvanceX;
00100         float verticalOriginX;
00101         float verticalOriginY;
00102         float verticalAdvanceY;
00103 
00104         Path pathData;
00105         Vector<String> languages;
00106     };
00107 
00108     class SVGGlyphElement : public SVGStyledElement {
00109     public:
00110         SVGGlyphElement(const QualifiedName&, Document*);
00111         virtual ~SVGGlyphElement();
00112 
00113         virtual void insertedIntoDocument();
00114         virtual void removedFromDocument();
00115 
00116         virtual bool rendererIsNeeded(RenderStyle*) { return false; }
00117 
00118         SVGGlyphIdentifier buildGlyphIdentifier() const;
00119 
00120         // Helper function used by SVGFont
00121         static void inheritUnspecifiedAttributes(SVGGlyphIdentifier&, const SVGFontData*);
00122         static String querySVGFontLanguage(const SVGElement*);
00123 
00124         // Helper function shared between SVGGlyphElement & SVGMissingGlyphElement
00125         static SVGGlyphIdentifier buildGenericGlyphIdentifier(const SVGElement*);
00126     };
00127 
00128 } // namespace WebCore
00129 
00130 #endif // ENABLE(SVG_FONTS)
00131 #endif

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