/*
 * 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 SKY_ENGINE_CORE_CSS_CSSFONTFACE_H_
#define SKY_ENGINE_CORE_CSS_CSSFONTFACE_H_

#include "sky/engine/core/css/CSSFontFaceSource.h"
#include "sky/engine/core/css/CSSSegmentedFontFace.h"
#include "sky/engine/core/css/FontFace.h"
#include "sky/engine/wtf/Deque.h"
#include "sky/engine/wtf/Forward.h"
#include "sky/engine/wtf/PassRefPtr.h"
#include "sky/engine/wtf/Vector.h"

namespace blink {

class CSSFontSelector;
class Document;
class FontDescription;
class SimpleFontData;
class StyleRuleFontFace;

class CSSFontFace final {
public:
    struct UnicodeRange;
    class UnicodeRangeSet;

    CSSFontFace(FontFace* fontFace, Vector<UnicodeRange>& ranges)
        : m_ranges(ranges)
        , m_segmentedFontFace(nullptr)
        , m_fontFace(fontFace)
    {
        ASSERT(m_fontFace);
    }

    FontFace* fontFace() const { return m_fontFace; }

    UnicodeRangeSet& ranges() { return m_ranges; }

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

    bool isValid() const { return !m_sources.isEmpty(); }

    void addSource(PassOwnPtr<CSSFontFaceSource>);

    PassRefPtr<SimpleFontData> getFontData(const FontDescription&);

    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; }
        bool operator<(const UnicodeRange& other) const { return m_from < other.m_from; }
        bool operator<(UChar32 c) const { return m_to < c; }

    private:
        UChar32 m_from;
        UChar32 m_to;
    };

    class UnicodeRangeSet {
    public:
        explicit UnicodeRangeSet(const Vector<UnicodeRange>&);
        bool contains(UChar32) const;
        bool intersectsWith(const String&) const;
        bool isEntireRange() const { return m_ranges.isEmpty(); }
        size_t size() const { return m_ranges.size(); }
        const UnicodeRange& rangeAt(size_t i) const { return m_ranges[i]; }
    private:
        Vector<UnicodeRange> m_ranges; // If empty, represents the whole code space.
    };

    FontFace::LoadStatus loadStatus() const { return m_fontFace->loadStatus(); }
    bool maybeScheduleFontLoad(const FontDescription&, UChar32);
    void load();
    void load(const FontDescription&);

    bool hadBlankText() { return isValid() && m_sources.first()->hadBlankText(); }

private:
    void setLoadStatus(FontFace::LoadStatus);

    UnicodeRangeSet m_ranges;
    RawPtr<CSSSegmentedFontFace> m_segmentedFontFace;
    Deque<OwnPtr<CSSFontFaceSource> > m_sources;
    RawPtr<FontFace> m_fontFace;
};

}

#endif  // SKY_ENGINE_CORE_CSS_CSSFONTFACE_H_