Source/core/css/CSSFontFace.h

/*
 * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef CSSFontFace_h
#define CSSFontFace_h

#include "core/css/CSSFontFaceSource.h"
#include "core/css/FontFace.h"
#include "wtf/Forward.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/Vector.h"

namespace WebCore {

class CSSSegmentedFontFace;
class FontDescription;
class FontResource;
class SimpleFontData;

// FIXME: Can this be a subclass of FontFace?
class CSSFontFace : public RefCounted<CSSFontFace> {
public:
    static PassRefPtr<CSSFontFace> create(PassRefPtr<FontFace> fontFace) { return adoptRef(new CSSFontFace(fontFace)); }

    class UnicodeRangeSet;

    FontFace* fontFace() const { return m_fontFace.get(); }

    UnicodeRangeSet& ranges() { return m_ranges; }

    void setSegmentedFontFace(CSSSegmentedFontFace*);
    void clearSegmentedFontFace() { m_segmentedFontFace = 0; }

    bool isLoaded() const;
    bool isValid() const;

    void addSource(PassOwnPtr<CSSFontFaceSource>);

    void beginLoadingFontSoon(FontResource*);
    void fontLoaded(CSSFontFaceSource*);

    PassRefPtr<SimpleFontData> getFontData(const FontDescription&, bool syntheticBold, bool syntheticItalic);

    struct UnicodeRange {
        UnicodeRange(UChar32 from, UChar32 to)
            : m_from(from)
            , m_to(to)
        {
        }

        UChar32 from() const { return m_from; }
        UChar32 to() const { return m_to; }
        bool contains(UChar32 c) const { return m_from <= c && c <= m_to; }

    private:
        UChar32 m_from;
        UChar32 m_to;
    };

    class UnicodeRangeSet {
    public:
        void add(UChar32 from, UChar32 to) { m_ranges.append(UnicodeRange(from, to)); }
        bool intersectsWith(const String&) const;
        size_t size() const { return m_ranges.size(); }
        const UnicodeRange& rangeAt(size_t i) const { return m_ranges[i]; }
    private:
        Vector<UnicodeRange> m_ranges;
    };

    FontFace::LoadStatus loadStatus() const { return m_fontFace ? m_fontFace->loadStatus() : FontFace::Loaded; }
    void willUseFontData(const FontDescription&);

private:
    CSSFontFace(PassRefPtr<FontFace> fontFace)
        : m_segmentedFontFace(0)
        , m_activeSource(0)
        , m_fontFace(fontFace)
    {
    }
    void setLoadStatus(FontFace::LoadStatus);

    UnicodeRangeSet m_ranges;
    CSSSegmentedFontFace* m_segmentedFontFace;
    Vector<OwnPtr<CSSFontFaceSource> > m_sources;
    CSSFontFaceSource* m_activeSource;
    RefPtr<FontFace> m_fontFace;
};

}

#endif