Home | History | Annotate | Download | only in svg 
      1 /*
      2  * Copyright (C) 2007 Eric Seidel <eric (at) webkit.org>
      3  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      4  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      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 SVGFontElement_h
     23 #define SVGFontElement_h
     24 
     25 #if ENABLE(SVG_FONTS)
     26 #include "SVGNames.h"
     27 #include "core/svg/SVGAnimatedBoolean.h"
     28 #include "core/svg/SVGElement.h"
     29 #include "core/svg/SVGExternalResourcesRequired.h"
     30 #include "core/svg/SVGGlyphMap.h"
     31 #include "core/svg/SVGParserUtilities.h"
     32 
     33 namespace WebCore {
     34 
     35 // Describe an SVG <hkern>/<vkern> element
     36 struct SVGKerningPair {
     37     float kerning;
     38     UnicodeRanges unicodeRange1;
     39     UnicodeRanges unicodeRange2;
     40     HashSet<String> unicodeName1;
     41     HashSet<String> unicodeName2;
     42     HashSet<String> glyphName1;
     43     HashSet<String> glyphName2;
     44 
     45     SVGKerningPair()
     46         : kerning(0)
     47     {
     48     }
     49 };
     50 
     51 typedef Vector<SVGKerningPair> KerningPairVector;
     52 
     53 class SVGMissingGlyphElement;
     54 
     55 class SVGFontElement FINAL : public SVGElement
     56                            , public SVGExternalResourcesRequired {
     57 public:
     58     static PassRefPtr<SVGFontElement> create(const QualifiedName&, Document*);
     59 
     60     void invalidateGlyphCache();
     61     void collectGlyphsForString(const String&, Vector<SVGGlyph>&);
     62     void collectGlyphsForGlyphName(const String&, Vector<SVGGlyph>&);
     63 
     64     float horizontalKerningForPairOfStringsAndGlyphs(const String& u1, const String& g1, const String& u2, const String& g2) const;
     65     float verticalKerningForPairOfStringsAndGlyphs(const String& u1, const String& g1, const String& u2, const String& g2) const;
     66 
     67     // Used by SimpleFontData/WidthIterator.
     68     SVGGlyph svgGlyphForGlyph(Glyph);
     69     Glyph missingGlyph();
     70 
     71     SVGMissingGlyphElement* firstMissingGlyphElement() const;
     72 
     73 private:
     74     SVGFontElement(const QualifiedName&, Document*);
     75 
     76     virtual bool rendererIsNeeded(const NodeRenderingContext&) { return false; }
     77 
     78     void ensureGlyphCache();
     79     void registerLigaturesInGlyphCache(Vector<String>&);
     80 
     81     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGFontElement)
     82         DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
     83     END_DECLARE_ANIMATED_PROPERTIES
     84 
     85     KerningPairVector m_horizontalKerningPairs;
     86     KerningPairVector m_verticalKerningPairs;
     87     SVGGlyphMap m_glyphMap;
     88     Glyph m_missingGlyph;
     89     bool m_isGlyphCacheValid;
     90 };
     91 
     92 inline SVGFontElement* toSVGFontElement(Node* node)
     93 {
     94     ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(SVGNames::fontTag));
     95     return static_cast<SVGFontElement*>(node);
     96 }
     97 
     98 } // namespace WebCore
     99 
    100 #endif // ENABLE(SVG_FONTS)
    101 #endif
    102