Source/WebCore/platform/graphics/FontRanges.h

/*
 * Copyright (C) 2008, 2009, 2015 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 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 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 FontRanges_h
#define FontRanges_h

#include "Font.h"
#include <wtf/Vector.h>

namespace WebCore {

class FontAccessor;

enum class ExternalResourceDownloadPolicy {
    Forbid,
    Allow
};

class FontRanges {
public:
    struct Range {
        Range(UChar32 from, UChar32 to, Ref<FontAccessor>&& fontAccessor)
            : m_from(from)
            , m_to(to)
            , m_fontAccessor(WTFMove(fontAccessor))
        {
        }

        Range(const Range& range)
            : m_from(range.m_from)
            , m_to(range.m_to)
            , m_fontAccessor(range.m_fontAccessor.copyRef())
        {
        }

        Range(Range&&) = default;
        Range& operator=(const Range&) = delete;
        Range& operator=(Range&&) = default;

        UChar32 from() const { return m_from; }
        UChar32 to() const { return m_to; }
        const Font* font(ExternalResourceDownloadPolicy) const;
        const FontAccessor& fontAccessor() const { return m_fontAccessor; }

    private:
        UChar32 m_from;
        UChar32 m_to;
        Ref<FontAccessor> m_fontAccessor;
    };

    FontRanges();
    explicit FontRanges(RefPtr<Font>&&);
    ~FontRanges();

    FontRanges(const FontRanges&) = default;
    FontRanges& operator=(FontRanges&&) = default;

    bool isNull() const { return m_ranges.isEmpty(); }

    void appendRange(Range&& range) { m_ranges.append(WTFMove(range)); }
    unsigned size() const { return m_ranges.size(); }
    const Range& rangeAt(unsigned i) const { return m_ranges[i]; }

    WEBCORE_EXPORT GlyphData glyphDataForCharacter(UChar32, ExternalResourceDownloadPolicy) const;
    WEBCORE_EXPORT const Font* fontForCharacter(UChar32) const;
    WEBCORE_EXPORT const Font& fontForFirstRange() const;
    bool isLoading() const;

private:
    Vector<Range, 1> m_ranges;
};

}

#endif