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      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 "core/SVGNames.h"
     27 #include "core/svg/SVGAnimatedBoolean.h"
     28 #include "core/svg/SVGElement.h"
     29 #include "core/svg/SVGGlyphMap.h"
     30 #include "core/svg/SVGParserUtilities.h"
     31 
     32 namespace blink {
     33 
     34 // Describe an SVG <hkern>/<vkern> element
     35 struct SVGKerningPair {
     36     float kerning;
     37     UnicodeRanges unicodeRange1;
     38     UnicodeRanges unicodeRange2;
     39     HashSet<String> unicodeName1;
     40     HashSet<String> unicodeName2;
     41     HashSet<String> glyphName1;
     42     HashSet<String> glyphName2;
     43 
     44     SVGKerningPair()
     45         : kerning(0)
     46     {
     47     }
     48 };
     49 
     50 typedef unsigned KerningPairKey;
     51 typedef Vector<SVGKerningPair> KerningPairVector;
     52 typedef HashMap<KerningPairKey, float> KerningTable;
     53 
     54 class SVGFontElement FINAL : public SVGElement {
     55     DEFINE_WRAPPERTYPEINFO();
     56 public:
     57     DECLARE_NODE_FACTORY(SVGFontElement);
     58 
     59     void invalidateGlyphCache();
     60     void collectGlyphsForString(const String&, Vector<SVGGlyph>&);
     61     void collectGlyphsForAltGlyphReference(const String&, Vector<SVGGlyph>&);
     62 
     63     float horizontalKerningForPairOfGlyphs(Glyph, Glyph) const;
     64     float verticalKerningForPairOfGlyphs(Glyph, Glyph) const;
     65 
     66     // Used by SimpleFontData/WidthIterator.
     67     SVGGlyph svgGlyphForGlyph(Glyph);
     68     Glyph missingGlyph();
     69 
     70 private:
     71     explicit SVGFontElement(Document&);
     72 
     73     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE { return false; }
     74 
     75     void ensureGlyphCache();
     76     void registerLigaturesInGlyphCache(Vector<String>&);
     77     Vector<SVGGlyph> buildGlyphList(const UnicodeRanges&, const HashSet<String>& unicodeNames, const HashSet<String>& glyphNames) const;
     78     void addPairsToKerningTable(const SVGKerningPair&, KerningTable&);
     79     void buildKerningTable(const KerningPairVector&, KerningTable&);
     80 
     81 
     82     KerningTable m_horizontalKerningTable;
     83     KerningTable m_verticalKerningTable;
     84     SVGGlyphMap m_glyphMap;
     85     Glyph m_missingGlyph;
     86     bool m_isGlyphCacheValid;
     87 };
     88 
     89 } // namespace blink
     90 
     91 #endif // ENABLE(SVG_FONTS)
     92 #endif // SVGFontElement_h
     93