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/*
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, 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.
*/
#ifndef CachedImage_h
#define CachedImage_h
#include "CachedResource.h"
#include "CachedResourceClient.h"
#include "SVGImageCache.h"
#include "ImageObserver.h"
#include "IntRect.h"
#include "Timer.h"
#include <wtf/Vector.h>
namespace WebCore {
class CachedResourceLoader;
class FloatSize;
class MemoryCache;
class RenderObject;
struct Length;
class CachedImage : public CachedResource, public ImageObserver {
friend class MemoryCache;
public:
CachedImage(const ResourceRequest&);
CachedImage(Image*);
virtual ~CachedImage();
virtual void load(CachedResourceLoader*, const ResourceLoaderOptions&);
Image* image(); // Returns the nullImage() if the image is not available yet.
Image* imageForRenderer(const RenderObject*); // Returns the nullImage() if the image is not available yet.
bool hasImage() const { return m_image.get(); }
std::pair<Image*, float> brokenImage(float deviceScaleFactor) const; // Returns an image and the image's resolution scale factor.
bool willPaintBrokenImage() const;
bool canRender(const RenderObject* renderer, float multiplier) { return !errorOccurred() && !imageSizeForRenderer(renderer, multiplier).isEmpty(); }
void setContainerSizeForRenderer(const RenderObject*, const IntSize&, float);
bool usesImageContainerSize() const;
bool imageHasRelativeWidth() const;
bool imageHasRelativeHeight() const;
// This method takes a zoom multiplier that can be used to increase the natural size of the image by the zoom.
IntSize imageSizeForRenderer(const RenderObject*, float multiplier); // returns the size of the complete image.
void computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio);
void removeClientForRenderer(RenderObject*);
virtual void didAddClient(CachedResourceClient*);
virtual void allClientsRemoved();
virtual void destroyDecodedData();
virtual void data(PassRefPtr<SharedBuffer> data, bool allDataReceived);
virtual void error(CachedResource::Status);
virtual void setResponse(const ResourceResponse&);
// For compatibility, images keep loading even if there are HTTP errors.
virtual bool shouldIgnoreHTTPStatusCodeErrors() const { return true; }
virtual bool isImage() const { return true; }
bool stillNeedsLoad() const { return !errorOccurred() && status() == Unknown && !isLoading(); }
void load();
// ImageObserver
virtual void decodedSizeChanged(const Image* image, int delta);
virtual void didDraw(const Image*);
virtual bool shouldPauseAnimation(const Image*);
virtual void animationAdvanced(const Image*);
virtual void changedInRect(const Image*, const IntRect&);
private:
Image* lookupOrCreateImageForRenderer(const RenderObject*);
void clear();
void createImage();
size_t maximumDecodedImageSize();
// If not null, changeRect is the changed part of the image.
void notifyObservers(const IntRect* changeRect = 0);
void decodedDataDeletionTimerFired(Timer<CachedImage>*);
virtual PurgePriority purgePriority() const { return PurgeFirst; }
void checkShouldPaintBrokenImage();
RefPtr<Image> m_image;
#if ENABLE(SVG)
OwnPtr<SVGImageCache> m_svgImageCache;
#endif
Timer<CachedImage> m_decodedDataDeletionTimer;
bool m_shouldPaintBrokenImage;
};
class CachedImageClient : public CachedResourceClient {
public:
virtual ~CachedImageClient() { }
static CachedResourceClientType expectedType() { return ImageType; }
virtual CachedResourceClientType resourceClientType() { return expectedType(); }
// Called whenever a frame of an image changes, either because we got more data from the network or
// because we are animating. If not null, the IntRect is the changed rect of the image.
virtual void imageChanged(CachedImage*, const IntRect* = 0) { }
// Called to find out if this client wants to actually display the image. Used to tell when we
// can halt animation. Content nodes that hold image refs for example would not render the image,
// but RenderImages would (assuming they have visibility: visible and their render tree isn't hidden
// e.g., in the b/f cache or in a background tab).
virtual bool willRenderImage(CachedImage*) { return false; }
};
}
#endif
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