1/*
2 * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
3 * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@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
32namespace blink {
33
34// Describe an SVG <hkern>/<vkern> element
35struct 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
50typedef unsigned KerningPairKey;
51typedef Vector<SVGKerningPair> KerningPairVector;
52typedef HashMap<KerningPairKey, float> KerningTable;
53
54class SVGFontElement FINAL : public SVGElement {
55    DEFINE_WRAPPERTYPEINFO();
56public:
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
70private:
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