/*

 * Copyright (C) 2006 Apple Computer, 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. 

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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.

 */

#include "config.h"

#include "FontFallbackList.h"

#include "Font.h"

#include "FontCache.h"

namespace WebCore {

FontFallbackList::FontFallbackList()

    : m_familyIndex(0), m_pitch(UnknownPitch)

{

}

void FontFallbackList::invalidate()

{

    m_fontList.clear();

    m_familyIndex = 0;    

    m_pitch = UnknownPitch;

}

void FontFallbackList::determinePitch(const Font* font) const

{

    m_pitch = primaryFont(font)->pitch();

}

const FontData* FontFallbackList::fontDataAt(const Font* font, unsigned realizedFontIndex) const

{

    if (realizedFontIndex < m_fontList.size())

        return m_fontList[realizedFontIndex]; // This fallback font is already in our list.

    // Make sure we're not passing in some crazy value here.

    ASSERT(realizedFontIndex == m_fontList.size());

    if (m_familyIndex == cAllFamiliesScanned)

        return 0;

    // Ask the font cache for the font data.

    // We are obtaining this font for the first time.  We keep track of the families we've looked at before

    // in |m_familyIndex|, so that we never scan the same spot in the list twice.  getFontData will adjust our

    // |m_familyIndex| as it scans for the right font to make.

    const FontData* result = FontCache::getFontData(*font, m_familyIndex);

    if (result)

        m_fontList.append(result);

    return result;

}

const FontData* FontFallbackList::fontDataForCharacters(const Font* font, const UChar* characters, int length) const

{

    // This method is only called when the primary font does not contain the characters we need.

    // Begin our search at position 1.

    unsigned realizedFontIndex = 1;

    const FontData* fontData = fontDataAt(font, realizedFontIndex);

    while (fontData && !fontData->containsCharacters(characters, length))

        fontData = fontDataAt(font, ++realizedFontIndex);

    if (!fontData)

        fontData = FontCache::getFontDataForCharacters(*font, characters, length);

    return fontData;

}

void FontFallbackList::setPlatformFont(const FontPlatformData& platformData)

{

    m_familyIndex = cAllFamiliesScanned;

    m_fontList.append(FontCache::getCachedFontData(&platformData));

}

}