CachedImage.h   [plain text]

/*
    This file is part of the KDE libraries

    Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
    Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
    Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
    Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.

    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., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.

    This class provides all functionality needed for loading images, style sheets and html
    pages from the web. It has a memory cache for these objects.
*/

#ifndef KHTML_CachedImage_h
#define KHTML_CachedImage_h

#include "CachedResource.h"
#include "ImageObserver.h"
#include "IntRect.h"
#include <wtf/Vector.h>

namespace WebCore {

class DocLoader;
class Cache;
class Image;

class CachedImage : public CachedResource, public ImageObserver {
public:
    CachedImage(DocLoader*, const String& url, CachePolicy);
    virtual ~CachedImage();

    Image* image() const;

    bool canRender() const { return !isErrorImage() && imageSize().width() > 0 && imageSize().height() > 0; }

    IntSize imageSize() const;  // returns the size of the complete image
    IntRect imageRect() const;  // The size of the image.

    virtual void ref(CachedResourceClient*);
    
    virtual void allReferencesRemoved(); 
    virtual void destroyDecodedData(); 
    
    virtual Vector<char>& bufferData(const char* bytes, int addedSize, Request*);
    virtual void data(Vector<char>&, bool allDataReceived);
    virtual void error();

    bool isErrorImage() const { return m_errorOccurred; }

    virtual bool schedule() const { return true; }

    void checkNotify();
    
    virtual bool isImage() const { return true; }

    void clear();
    
    virtual unsigned decodedSize() const; 
	 
    virtual void decodedSizeChanging(const Image* image, int delta);
    virtual void decodedSizeChanged(const Image* image, int delta); 

    virtual bool shouldPauseAnimation(const Image* image); 
    virtual void animationAdvanced(const Image* image);

    bool stillNeedsLoad() const { return !m_errorOccurred && m_status == Unknown && m_loading == false; }
    void load();

private:
    void createImage();
    void notifyObservers();

    Image* m_image;
    int m_dataSize;
    int m_maxDataSize;
    
    bool m_errorOccurred : 1;

    friend class Cache;
};

}

#endif