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| 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 #ifndef ImageResourceObserver_h | |
| 24 #define ImageResourceObserver_h | |
| 25 | |
| 26 #include "core/CoreExport.h" | |
| 27 #include "platform/graphics/ImageAnimationPolicy.h" | |
| 28 #include "platform/network/ResourceLoadPriority.h" | |
| 29 #include "wtf/Forward.h" | |
| 30 | |
| 31 namespace blink { | |
| 32 | |
| 33 class ImageResourceContent; | |
| 34 class IntRect; | |
| 35 | |
| 36 class CORE_EXPORT ImageResourceObserver { | |
| 37 public: | |
| 38 virtual ~ImageResourceObserver() {} | |
| 39 | |
| 40 // Called whenever a frame of an image changes, either because we got more | |
| 41 // data from the network or because we are animating. If not null, the IntRect | |
| 42 // is the changed rect of the image. | |
| 43 virtual void imageChanged(ImageResourceContent*, const IntRect* = 0) {} | |
| 44 | |
| 45 // Called just after imageChanged() if all image data is received or errored. | |
| 46 // TODO(hiroshige): Merge imageNotifyFinished() into imageChanged(). | |
| 47 virtual void imageNotifyFinished(ImageResourceContent*) {} | |
| 48 | |
| 49 // Called to find out if this client wants to actually display the image. Used | |
| 50 // to tell when we can halt animation. Content nodes that hold image refs for | |
| 51 // example would not render the image, but LayoutImages would (assuming they | |
| 52 // have visibility: visible and their layout tree isn't hidden e.g., in the | |
| 53 // b/f cache or in a background tab). | |
| 54 // | |
| 55 // An implementation of this method is not allowed to add or remove | |
| 56 // ImageResource observers. | |
| 57 virtual bool willRenderImage() { return false; } | |
| 58 | |
| 59 // Called to get imageAnimation policy from settings. An implementation of | |
| 60 // this method is not allowed to add or remove ImageResource observers. | |
| 61 virtual bool getImageAnimationPolicy(ImageAnimationPolicy&) { return false; } | |
| 62 | |
| 63 // Return the observer's requested resource priority. An implementation of | |
| 64 // this method is not allowed to add or remove ImageResource observers. | |
| 65 virtual ResourcePriority computeResourcePriority() const { | |
| 66 return ResourcePriority(); | |
| 67 } | |
| 68 | |
| 69 // Name for debugging, e.g. shown in memory-infra. | |
| 70 virtual String debugName() const = 0; | |
| 71 | |
| 72 static bool isExpectedType(ImageResourceObserver*) { return true; } | |
| 73 }; | |
| 74 | |
| 75 } // namespace blink | |
| 76 | |
| 77 #endif | |
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Chromium Code Reviews
Issue 2558033002:
Loading: move ImageResource and related classes to core/loader/resource (Closed)
