/*

 * 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. 

 */

#include "config.h"

#include "CSSFontFaceSource.h"

#include "CachedFont.h"

#include "CSSFontFace.h"

#include "CSSFontSelector.h"

#include "DocLoader.h"

#include "FontCache.h"

#include "FontDescription.h"

#include "GlyphPageTreeNode.h"

#include "SimpleFontData.h"

#if ENABLE(SVG_FONTS)

#if !PLATFORM(WX)

#include "FontCustomPlatformData.h"

#endif

#include "HTMLNames.h"

#include "SVGFontData.h"

#include "SVGFontElement.h"

#include "SVGFontFaceElement.h"

#include "SVGURIReference.h"

#endif

namespace WebCore {

CSSFontFaceSource::CSSFontFaceSource(const String& str, CachedFont* font)

    : m_string(str)

    , m_font(font)

    , m_face(0)

#if ENABLE(SVG_FONTS)

    , m_svgFontFaceElement(0)

#endif

{

    if (m_font)

        m_font->addClient(this);

}

CSSFontFaceSource::~CSSFontFaceSource()

{

    if (m_font)

        m_font->removeClient(this);

    pruneTable();

}

void CSSFontFaceSource::pruneTable()

{

    if (m_fontDataTable.isEmpty())

        return;

    HashMap<unsigned, SimpleFontData*>::iterator end = m_fontDataTable.end();

    for (HashMap<unsigned, SimpleFontData*>::iterator it = m_fontDataTable.begin(); it != end; ++it)

        GlyphPageTreeNode::pruneTreeCustomFontData(it->second);

    deleteAllValues(m_fontDataTable);

    m_fontDataTable.clear();

}

bool CSSFontFaceSource::isLoaded() const

{

    if (m_font)

        return m_font->isLoaded();

    return true;

}

bool CSSFontFaceSource::isValid() const

{

    if (m_font)

        return !m_font->errorOccurred();

    return true;

}

void CSSFontFaceSource::fontLoaded(CachedFont*)

{

    pruneTable();

    if (m_face)

        m_face->fontLoaded(this);

}

SimpleFontData* CSSFontFaceSource::getFontData(const FontDescription& fontDescription, bool syntheticBold, bool syntheticItalic, CSSFontSelector* fontSelector)

{

    // If the font hasn't loaded or an error occurred, then we've got nothing.

    if (!isValid())

        return 0;

#if ENABLE(SVG_FONTS)

    if (!m_font && !m_svgFontFaceElement) {

#else

    if (!m_font) {

#endif

        SimpleFontData* fontData = fontCache()->getCachedFontData(fontDescription, m_string);

        // We're local. Just return a SimpleFontData from the normal cache.

        return fontData;

    }

    // See if we have a mapping in our FontData cache.

    unsigned hashKey = fontDescription.computedPixelSize() << 2 | (syntheticBold ? 2 : 0) | (syntheticItalic ? 1 : 0);

    if (SimpleFontData* cachedData = m_fontDataTable.get(hashKey))

        return cachedData;

    OwnPtr<SimpleFontData> fontData;

    // If we are still loading, then we let the system pick a font.

    if (isLoaded()) {

        if (m_font) {

#if ENABLE(SVG_FONTS)

            if (m_font->isSVGFont()) {

                // For SVG fonts parse the external SVG document, and extract the <font> element.

                if (!m_font->ensureSVGFontData())

                    return 0;

                if (!m_externalSVGFontElement)

                    m_externalSVGFontElement = m_font->getSVGFontById(SVGURIReference::getTarget(m_string));

                if (!m_externalSVGFontElement)

                    return 0;

                SVGFontFaceElement* fontFaceElement = 0;

                // Select first <font-face> child

                for (Node* fontChild = m_externalSVGFontElement->firstChild(); fontChild; fontChild = fontChild->nextSibling()) {

                    if (fontChild->hasTagName(SVGNames::font_faceTag)) {

                        fontFaceElement = static_cast<SVGFontFaceElement*>(fontChild);

                        break;

                    }

                }

                if (fontFaceElement) {

                    if (!m_svgFontFaceElement) {

                        // We're created using a CSS @font-face rule, that means we're not associated with a SVGFontFaceElement.

                        // Use the imported <font-face> tag as referencing font-face element for these cases.

                        m_svgFontFaceElement = fontFaceElement;

                    }

                    SVGFontData* svgFontData = new SVGFontData(fontFaceElement);

                    fontData.set(new SimpleFontData(m_font->platformDataFromCustomData(fontDescription.computedPixelSize(), syntheticBold, syntheticItalic, fontDescription.renderingMode()), true, false, svgFontData));

                }

            } else

#endif

            {

                // Create new FontPlatformData from our CGFontRef, point size and ATSFontRef.

                if (!m_font->ensureCustomFontData())

                    return 0;

                fontData.set(new SimpleFontData(m_font->platformDataFromCustomData(fontDescription.computedPixelSize(), syntheticBold, syntheticItalic, fontDescription.renderingMode()), true, false));

            }

        } else {

#if ENABLE(SVG_FONTS)

            // In-Document SVG Fonts

            if (m_svgFontFaceElement) {

                SVGFontData* svgFontData = new SVGFontData(m_svgFontFaceElement);

                fontData.set(new SimpleFontData(FontPlatformData(fontDescription.computedPixelSize(), syntheticBold, syntheticItalic), true, false, svgFontData));

            }

#endif

        }

    } else {

        // Kick off the load now.

        if (DocLoader* docLoader = fontSelector->docLoader())

            m_font->beginLoadIfNeeded(docLoader);

        // FIXME: m_string is a URL so it makes no sense to pass it as a family name.

        SimpleFontData* tempData = fontCache()->getCachedFontData(fontDescription, m_string);

        if (!tempData)

            tempData = fontCache()->getLastResortFallbackFont(fontDescription);

        fontData.set(new SimpleFontData(tempData->platformData(), true, true));

    }

    SimpleFontData* fontDataRawPtr = fontData.leakPtr();

    m_fontDataTable.set(hashKey, fontDataRawPtr);

    return fontDataRawPtr;

}

}