/*
 * Copyright (c) 2009, Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT
 * OWNER 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 FontFaceCreationParams_h
#define FontFaceCreationParams_h

#include "wtf/Assertions.h"
#include "wtf/StringHasher.h"
#include "wtf/text/AtomicString.h"
#include "wtf/text/StringHash.h"

namespace blink {

enum FontFaceCreationType {
    CreateFontByFamily,
    CreateFontByFciIdAndTtcIndex
};

class FontFaceCreationParams {
    FontFaceCreationType m_creationType;
    AtomicString m_family;
    CString m_filename;
    int m_fontconfigInterfaceId;
    int m_ttcIndex;

public:
    FontFaceCreationParams()
        : m_creationType(CreateFontByFamily), m_family(AtomicString()), m_filename(CString()), m_fontconfigInterfaceId(0), m_ttcIndex(0)
    {
    }

    explicit FontFaceCreationParams(AtomicString family)
        : m_creationType(CreateFontByFamily), m_family(family), m_filename(CString()), m_fontconfigInterfaceId(0), m_ttcIndex(0)
    {
    }

    FontFaceCreationParams(CString filename, int fontconfigInterfaceId, int ttcIndex = 0)
        : m_creationType(CreateFontByFciIdAndTtcIndex), m_filename(filename), m_fontconfigInterfaceId(fontconfigInterfaceId), m_ttcIndex(ttcIndex)
    {
    }

    FontFaceCreationType creationType() const { return m_creationType; }
    AtomicString family() const
    {
        ASSERT(m_creationType == CreateFontByFamily);
        return m_family;
    }
    CString filename() const
    {
        ASSERT(m_creationType == CreateFontByFciIdAndTtcIndex);
        return m_filename;
    }
    int fontconfigInterfaceId() const
    {
        ASSERT(m_creationType == CreateFontByFciIdAndTtcIndex);
        return m_fontconfigInterfaceId;
    }
    int ttcIndex() const
    {
        ASSERT(m_creationType == CreateFontByFciIdAndTtcIndex);
        return m_ttcIndex;
    }

    unsigned hash() const
    {
        if (m_creationType == CreateFontByFciIdAndTtcIndex) {
            StringHasher hasher;
            // Hashing the filename and ints in this way is sensitive to character encoding
            // and endianness. However, since the hash is not transferred over a network
            // or permanently stored and only used for the runtime of Chromium,
            // this is not a concern.
            hasher.addCharacters(reinterpret_cast<const LChar*>(m_filename.data()), m_filename.length());
            hasher.addCharacters(reinterpret_cast<const LChar*>(&m_ttcIndex), sizeof(m_ttcIndex));
            hasher.addCharacters(reinterpret_cast<const LChar*>(&m_fontconfigInterfaceId), sizeof(m_fontconfigInterfaceId));
            return hasher.hash();
        }
        return CaseFoldingHash::hash(m_family.isEmpty() ? "" : m_family);
    }

    bool operator==(const FontFaceCreationParams& other) const
    {
        return m_creationType == other.m_creationType
            && equalIgnoringCase(m_family, other.m_family)
            && m_filename == other.m_filename
            && m_fontconfigInterfaceId == other.m_fontconfigInterfaceId
            && m_ttcIndex == other.m_ttcIndex;
    }

};

} // namespace blink

#endif // FontFaceCreationParams_h