SVGFontElement.h   [plain text]

/*
 * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
 * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifndef SVGFontElement_h
#define SVGFontElement_h

#if ENABLE(SVG_FONTS)
#include "SVGAnimatedBoolean.h"
#include "SVGElement.h"
#include "SVGExternalResourcesRequired.h"
#include "SVGGlyphMap.h"
#include "SVGParserUtilities.h"

namespace WebCore {

// Describe an SVG <hkern>/<vkern> element already matched on the first symbol.
struct SVGKerning {
    float kerning;
    UnicodeRanges unicodeRange2;
    HashSet<String> unicodeName2;
    HashSet<String> glyphName2;

    SVGKerning()
        : kerning(0)
    { }
};

// Describe an SVG <hkern>/<vkern> element
struct SVGKerningPair : public SVGKerning {
    UnicodeRanges unicodeRange1;
    HashSet<String> unicodeName1;
    HashSet<String> glyphName1;
};

typedef Vector<SVGKerning> SVGKerningVector;

struct SVGKerningMap {
    HashMap<String, std::unique_ptr<SVGKerningVector>> unicodeMap;
    HashMap<String, std::unique_ptr<SVGKerningVector>> glyphMap;
    Vector<SVGKerningPair> kerningUnicodeRangeMap;

    bool isEmpty() const { return unicodeMap.isEmpty() && glyphMap.isEmpty() && kerningUnicodeRangeMap.isEmpty(); }
    void clear();
    void insert(const SVGKerningPair&);
};

class SVGMissingGlyphElement;

class SVGFontElement final : public SVGElement
                           , public SVGExternalResourcesRequired {
public:
    static Ref<SVGFontElement> create(const QualifiedName&, Document&);

    void invalidateGlyphCache();
    void collectGlyphsForString(const String&, Vector<SVGGlyph>&);
    void collectGlyphsForGlyphName(const String&, Vector<SVGGlyph>&);

    float horizontalKerningForPairOfStringsAndGlyphs(const String& u1, const String& g1, const String& u2, const String& g2) const;
    float verticalKerningForPairOfStringsAndGlyphs(const String& u1, const String& g1, const String& u2, const String& g2) const;

    // Used by Font/WidthIterator.
    SVGGlyph svgGlyphForGlyph(Glyph);
    Glyph missingGlyph();

    const SVGMissingGlyphElement* firstMissingGlyphElement() const;
    bool horizontalKerningMapIsEmpty() const { return m_horizontalKerningMap.isEmpty(); }

private:
    SVGFontElement(const QualifiedName&, Document&);

    virtual bool rendererIsNeeded(const RenderStyle&) override { return false; }

    void ensureGlyphCache();
    void registerLigaturesInGlyphCache(Vector<String>&);

    BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGFontElement)
        DECLARE_ANIMATED_BOOLEAN_OVERRIDE(ExternalResourcesRequired, externalResourcesRequired)
    END_DECLARE_ANIMATED_PROPERTIES

    SVGKerningMap m_horizontalKerningMap;
    SVGKerningMap m_verticalKerningMap;
    SVGGlyphMap m_glyphMap;
    Glyph m_missingGlyph;
    bool m_isGlyphCacheValid;
};

} // namespace WebCore

#endif // ENABLE(SVG_FONTS)
#endif