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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 "CachedResourceClient.h"
#include "ImageTypes.h"
namespace WebCore {
class CachedImageClient;
}
namespace WTF {
template<typename T> struct IsDeprecatedWeakRefSmartPointerException;
template<> struct IsDeprecatedWeakRefSmartPointerException<WebCore::CachedImageClient> : std::true_type { };
}
namespace WebCore {
class CachedImage;
class Document;
class IntRect;
enum class VisibleInViewportState { Unknown, Yes, No };
class CachedImageClient : public CachedResourceClient {
public:
virtual ~CachedImageClient() = default;
static CachedResourceClientType expectedType() { return ImageType; }
CachedResourceClientType resourceClientType() const override { return expectedType(); }
// Called whenever a frame of an image changes because we got more data from the network.
// If not null, the IntRect is the changed rect of the image.
virtual void imageChanged(CachedImage*, const IntRect* = nullptr) { }
virtual bool canDestroyDecodedData() const { return true; }
// Called when a new decoded frame for a large image is available or when an animated image is ready to advance to the next frame.
virtual VisibleInViewportState imageFrameAvailable(CachedImage& image, ImageAnimatingState, const IntRect* changeRect) { imageChanged(&image, changeRect); return VisibleInViewportState::No; }
virtual VisibleInViewportState imageVisibleInViewport(const Document&) const { return VisibleInViewportState::No; }
virtual void didRemoveCachedImageClient(CachedImage&) { }
virtual void scheduleRenderingUpdateForImage(CachedImage&) { }
virtual bool allowsAnimation() const { return true; }
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_CACHED_RESOURCE_CLIENT(CachedImageClient, ImageType);
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