Split ImageResourceClient into ResourceClient and ImageResourceObserver [1/2]

third_party/WebKit/Source/core/fetch/ImageResourceClient.h

-/*
-    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 ImageResourceClient_h
-#define ImageResourceClient_h
-
-#include "core/CoreExport.h"
-#include "core/fetch/ResourceClient.h"
-#include "platform/graphics/ImageAnimationPolicy.h"
-
-namespace blink {
-
-class ImageResource;
-class IntRect;
-
-class CORE_EXPORT ImageResourceClient : public ResourceClient {
-public:
-    ~ImageResourceClient() override {}
-    static bool isExpectedType(ResourceClient* client) { return client->getResourceClientType() == ImageType; }
-    ResourceClientType getResourceClientType() const final { return ImageType; }
-
-    // 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(ImageResource*, 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 LayoutImages would (assuming they have visibility: visible and their layout tree isn't hidden
-    // e.g., in the b/f cache or in a background tab).
-    virtual bool willRenderImage(ImageResource*) { return false; }
-
-    // Called to get imageAnimation policy from settings
-    virtual bool getImageAnimationPolicy(ImageResource*, ImageAnimationPolicy&) { return false; }
-};
-
-} // namespace blink
-
-#endif