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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.
*/
#pragma once
#include "CachedResource.h"
#include "Image.h"
#include "ImageObserver.h"
#include "IntRect.h"
#include "IntSizeHash.h"
#include "LayoutSize.h"
#include "SVGImageCache.h"
#include <wtf/HashMap.h>
namespace WebCore {
class CachedImageClient;
class CachedResourceLoader;
class FloatSize;
class MemoryCache;
class RenderElement;
class RenderObject;
class SecurityOrigin;
struct Length;
class CachedImage final : public CachedResource {
friend class MemoryCache;
public:
CachedImage(CachedResourceRequest&&, SessionID);
CachedImage(Image*, SessionID);
// Constructor to use for manually cached images.
CachedImage(const URL&, Image*, SessionID);
virtual ~CachedImage();
WEBCORE_EXPORT Image* image(); // Returns the nullImage() if the image is not available yet.
WEBCORE_EXPORT Image* imageForRenderer(const RenderObject*); // Returns the nullImage() if the image is not available yet.
bool hasImage() const { return m_image.get(); }
bool currentFrameKnownToBeOpaque(const RenderElement*);
std::pair<Image*, float> brokenImage(float deviceScaleFactor) const; // Returns an image and the image's resolution scale factor.
bool willPaintBrokenImage() const;
bool canRender(const RenderElement* renderer, float multiplier) { return !errorOccurred() && !imageSizeForRenderer(renderer, multiplier).isEmpty(); }
void setContainerSizeForRenderer(const CachedImageClient*, const LayoutSize&, float);
bool usesImageContainerSize() const;
bool imageHasRelativeWidth() const;
bool imageHasRelativeHeight() const;
void addDataBuffer(SharedBuffer&) override;
void finishLoading(SharedBuffer*) override;
enum SizeType {
UsedSize,
IntrinsicSize
};
// This method takes a zoom multiplier that can be used to increase the natural size of the image by the zoom.
LayoutSize imageSizeForRenderer(const RenderElement*, float multiplier, SizeType = UsedSize); // returns the size of the complete image.
void computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio);
bool isManuallyCached() const { return m_isManuallyCached; }
RevalidationDecision makeRevalidationDecision(CachePolicy) const override;
void load(CachedResourceLoader&) override;
bool isOriginClean(SecurityOrigin*);
private:
void clear();
CachedImage(CachedImage&, const ResourceRequest&, SessionID);
void setBodyDataFrom(const CachedResource&) final;
void createImage();
void clearImage();
// If not null, changeRect is the changed part of the image.
void notifyObservers(const IntRect* changeRect = nullptr);
void checkShouldPaintBrokenImage();
void switchClientsToRevalidatedResource() final;
bool mayTryReplaceEncodedData() const final { return true; }
void didAddClient(CachedResourceClient&) final;
void didRemoveClient(CachedResourceClient&) final;
void allClientsRemoved() override;
void destroyDecodedData() override;
void addData(const char* data, unsigned length) override;
void error(CachedResource::Status) override;
void responseReceived(const ResourceResponse&) override;
// For compatibility, images keep loading even if there are HTTP errors.
bool shouldIgnoreHTTPStatusCodeErrors() const override { return true; }
bool stillNeedsLoad() const override { return !errorOccurred() && status() == Unknown && !isLoading(); }
class CachedImageObserver final : public RefCounted<CachedImageObserver>, public ImageObserver {
public:
static Ref<CachedImageObserver> create(CachedImage& image) { return adoptRef(*new CachedImageObserver(image)); }
void add(CachedImage& image) { m_cachedImages.append(&image); }
void remove(CachedImage& image) { m_cachedImages.removeFirst(&image); }
private:
explicit CachedImageObserver(CachedImage&);
// ImageObserver API
URL sourceUrl() const override { return m_cachedImages[0]->url(); }
bool allowSubsampling() const final { return m_allowSubsampling; }
bool allowLargeImageAsyncDecoding() const override { return m_allowLargeImageAsyncDecoding; }
bool allowAnimatedImageAsyncDecoding() const override { return m_allowAnimatedImageAsyncDecoding; }
bool showDebugBackground() const final { return m_showDebugBackground; }
void decodedSizeChanged(const Image*, long long delta) final;
void didDraw(const Image*) final;
void animationAdvanced(const Image*) final;
void changedInRect(const Image*, const IntRect*) final;
Vector<CachedImage*> m_cachedImages;
// The default value of m_allowSubsampling should be the same as defaultImageSubsamplingEnabled in Settings.cpp
#if PLATFORM(IOS)
bool m_allowSubsampling { true };
#else
bool m_allowSubsampling { false };
#endif
bool m_allowLargeImageAsyncDecoding { true };
bool m_allowAnimatedImageAsyncDecoding { true };
bool m_showDebugBackground { false };
};
void decodedSizeChanged(const Image*, long long delta);
void didDraw(const Image*);
void animationAdvanced(const Image*);
void changedInRect(const Image*, const IntRect*);
void addIncrementalDataBuffer(SharedBuffer&);
void didReplaceSharedBufferContents() override;
typedef std::pair<LayoutSize, float> SizeAndZoom;
typedef HashMap<const CachedImageClient*, SizeAndZoom> ContainerSizeRequests;
ContainerSizeRequests m_pendingContainerSizeRequests;
RefPtr<CachedImageObserver> m_imageObserver;
RefPtr<Image> m_image;
std::unique_ptr<SVGImageCache> m_svgImageCache;
bool m_isManuallyCached { false };
bool m_shouldPaintBrokenImage { true };
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_CACHED_RESOURCE(CachedImage, CachedResource::ImageResource)
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