/*

    Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)

    Copyright (C) 2001 Dirk Mueller (mueller@kde.org)

    Copyright (C) 2002 Waldo Bastian (bastian@kde.org)

    Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)

    Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License

    along with this library; see the file COPYING.LIB.  If not, write to

    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    Boston, MA 02110-1301, USA.

*/

#include "config.h"

#include "CachedImage.h"

#include "BitmapImage.h"

#include "Cache.h"

#include "CachedResourceClient.h"

#include "CachedResourceClientWalker.h"

#include "DocLoader.h"

#include "Frame.h"

#include "Request.h"

#include "SystemTime.h"

#include <wtf/Vector.h>

#if PLATFORM(CG)

#include "PDFDocumentImage.h"

#endif

#if ENABLE(SVG_EXPERIMENTAL_FEATURES)

#if PLATFORM(MAC) || PLATFORM(QT)

#include "SVGImage.h"

#endif

#endif

using std::max;

namespace WebCore {

CachedImage::CachedImage(const String& url)

    : CachedResource(url, ImageResource)

{

    m_image = 0;

    m_status = Unknown;

}

CachedImage::CachedImage(Image* image)

    : CachedResource(String(), ImageResource)

{

    m_image = image;

    m_status = Cached;

    m_loading = false;

}

CachedImage::~CachedImage()

{

    delete m_image;

}

void CachedImage::load(DocLoader* docLoader) 

{ 

    if (!docLoader || docLoader->autoLoadImages()) 

        CachedResource::load(docLoader, true, false, true); 

    else 

        m_loading = false; 

} 

void CachedImage::ref(CachedResourceClient* c)

{

    CachedResource::ref(c);

    if (!imageRect().isEmpty())

        c->imageChanged(this);

    if (!m_loading)

        c->notifyFinished(this);

}

void CachedImage::allReferencesRemoved()

{

    if (m_image && !m_errorOccurred)

        m_image->resetAnimation();

}

static Image* brokenImage()

{

    static OwnPtr<Image*> brokenImage;

    if (!brokenImage) {

        brokenImage.set(Image::loadPlatformResource("missingImage"));

    }

    Image* ret = brokenImage.get();

    return ret;

}

static Image* nullImage()

{

    static BitmapImage nullImage;

    return &nullImage;

}

Image* CachedImage::image() const

{

    if (m_errorOccurred)

        return brokenImage();

    if (m_image)

        return m_image;

    return nullImage();

}

IntSize CachedImage::imageSize() const

{

    return (m_image ? m_image->size() : IntSize());

}

IntRect CachedImage::imageRect() const

{

    return (m_image ? m_image->rect() : IntRect());

}

void CachedImage::notifyObservers()

{

    CachedResourceClientWalker w(m_clients);

    while (CachedResourceClient *c = w.next())

        c->imageChanged(this);

}

void CachedImage::clear()

{

    destroyDecodedData();

    delete m_image;

    m_image = 0;

    setEncodedSize(0);

}

inline void CachedImage::createImage()

{

    // Create the image if it doesn't yet exist.

    if (m_image)

        return;

#if PLATFORM(CG)

    if (m_response.mimeType() == "application/pdf") {

        m_image = new PDFDocumentImage;

        return;

    }

#endif

#if ENABLE(SVG_EXPERIMENTAL_FEATURES)

#if PLATFORM(MAC) || PLATFORM(QT)

    if (m_response.mimeType() == "image/svg+xml") {

        m_image = new SVGImage(this);

        return;

    }

#endif

#endif

    m_image = new BitmapImage(this);

#if PLATFORM(SYMBIAN)                                

    m_image->setMimeType(m_response.mimeType());

#endif

}

void CachedImage::data(PassRefPtr<SharedBuffer> data, bool allDataReceived)

{

    m_data = data;

    createImage();

    bool sizeAvailable = false;

    // Have the image update its data from its internal buffer.

    // It will not do anything now, but will delay decoding until 

    // queried for info (like size or specific image frames).

    sizeAvailable = m_image->setData(m_data, allDataReceived);

    // Go ahead and tell our observers to try to draw if we have either

    // received all the data or the size is known.  Each chunk from the

    // network causes observers to repaint, which will force that chunk

    // to decode.

            error();

            if (inCache())

                cache()->remove(this);

            return;

        }

        notifyObservers();

        if (m_image)

            setEncodedSize(m_image->data() ? m_image->data()->size() : 0);

    }

    if (allDataReceived) {

        m_loading = false;

#if !PLATFORM(SYMBIAN)

        checkNotify();

#endif

    }

}

void CachedImage::error()

{

    clear();

    m_errorOccurred = true;

    notifyObservers();

    m_loading = false;

    checkNotify();

}

void CachedImage::checkNotify()

{

    if (m_loading)

        return;

    CachedResourceClientWalker w(m_clients);

    while (CachedResourceClient* c = w.next())

        c->notifyFinished(this);

}

void CachedImage::destroyDecodedData()

{

    if (m_image && !m_errorOccurred)

        m_image->destroyDecodedData();

}

void CachedImage::decodedSizeChanged(const Image* image, int delta)

{

    if (image != m_image)

        return;

    setDecodedSize(decodedSize() + delta);

}

void CachedImage::didDraw(const Image* image)

{

    if (image != m_image)

        return;

    double timeStamp = Frame::currentPaintTimeStamp();

    if (!timeStamp) // If didDraw is called outside of a Frame paint.

        timeStamp = currentTime();

    CachedResource::didAccessDecodedData(timeStamp);

}

bool CachedImage::shouldPauseAnimation(const Image* image)

{

    if (image != m_image)

        return false;

    CachedResourceClientWalker w(m_clients);

    while (CachedResourceClient* c = w.next()) {

        if (c->willRenderImage(this))

            return false;

    }

    return true;

}

void CachedImage::animationAdvanced(const Image* image)

{

    if (image == m_image)

        notifyObservers();

}

#if PLATFORM(SYMBIAN)

void CachedImage::decoderError( int /*error*/ )

{

}

void CachedImage::partialImage()

{

    notifyObservers();

}

void CachedImage::imageReady(int size_)

{

    setDecodedSize(size_);

    notifyObservers();

    checkNotify();

}

void CachedImage::animationFrameReady(int size_)

{

    setDecodedSize(size_);

    notifyObservers();

	checkNotify();

}

void CachedImage::setMimeType(const String& mime_)

{

    m_response.setMimeType(mime_);

}

#endif

} //namespace WebCore