1 | /* |
2 | Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de) |
3 | Copyright (C) 2001 Dirk Mueller <mueller@kde.org> |
4 | Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com) |
5 | Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. |
6 | |
7 | This library is free software; you can redistribute it and/or |
8 | modify it under the terms of the GNU Library General Public |
9 | License as published by the Free Software Foundation; either |
10 | version 2 of the License, or (at your option) any later version. |
11 | |
12 | This library is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | Library General Public License for more details. |
16 | |
17 | You should have received a copy of the GNU Library General Public License |
18 | along with this library; see the file COPYING.LIB. If not, write to |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. |
21 | */ |
22 | |
23 | #pragma once |
24 | |
25 | #include "CachedResourceClient.h" |
26 | #include "ImageTypes.h" |
27 | |
28 | namespace WebCore { |
29 | |
30 | class CachedImage; |
31 | class IntRect; |
32 | |
33 | enum class VisibleInViewportState { Unknown, Yes, No }; |
34 | |
35 | class CachedImageClient : public CachedResourceClient { |
36 | public: |
37 | virtual ~CachedImageClient() = default; |
38 | static CachedResourceClientType expectedType() { return ImageType; } |
39 | CachedResourceClientType resourceClientType() const override { return expectedType(); } |
40 | |
41 | // Called whenever a frame of an image changes because we got more data from the network. |
42 | // If not null, the IntRect is the changed rect of the image. |
43 | virtual void imageChanged(CachedImage*, const IntRect* = nullptr) { } |
44 | |
45 | virtual bool canDestroyDecodedData() { return true; } |
46 | |
47 | // 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. |
48 | virtual VisibleInViewportState imageFrameAvailable(CachedImage& image, ImageAnimatingState, const IntRect* changeRect) { imageChanged(&image, changeRect); return VisibleInViewportState::No; } |
49 | |
50 | virtual void didRemoveCachedImageClient(CachedImage&) { } |
51 | }; |
52 | |
53 | } // namespace WebCore |
54 | |