2012-04-07 10:36:49 -07:00
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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2012-05-21 04:12:37 -07:00
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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2012-04-07 10:36:49 -07:00
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/* class to notify frames of background and border image loads */
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#include "nsStubImageDecoderObserver.h"
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class nsIFrame;
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class nsIURI;
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#include "imgIRequest.h"
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#include "nsCOMPtr.h"
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#include "nsAutoPtr.h"
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/**
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* Image loaders pass notifications for background and border image
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* loading and animation on to the frames.
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*
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* Each frame's image loaders form a linked list.
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*/
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class nsImageLoader : public nsStubImageDecoderObserver
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{
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private:
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nsImageLoader(nsIFrame *aFrame, PRUint32 aActions,
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nsImageLoader *aNextLoader);
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virtual ~nsImageLoader();
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public:
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/*
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* Flags to specify actions that can be taken for the image at various
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* times. Reflows always occur before redraws. "Decode" refers to one
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* frame being available, whereas "load" refers to all the data being loaded
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* from the network.
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*/
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enum {
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ACTION_REDRAW_ON_DECODE = 0x01,
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ACTION_REDRAW_ON_LOAD = 0x02,
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};
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static already_AddRefed<nsImageLoader>
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Create(nsIFrame *aFrame, imgIRequest *aRequest,
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PRUint32 aActions, nsImageLoader *aNextLoader);
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NS_DECL_ISUPPORTS
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// imgIDecoderObserver (override nsStubImageDecoderObserver)
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NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
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NS_IMETHOD OnStopFrame(imgIRequest *aRequest, PRUint32 aFrame);
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NS_IMETHOD OnStopRequest(imgIRequest *aRequest, bool aLastPart);
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NS_IMETHOD OnImageIsAnimated(imgIRequest *aRequest);
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// Do not override OnDataAvailable since background images are not
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// displayed incrementally; they are displayed after the entire image
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// has been loaded.
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// Note: Images referenced by the <img> element are displayed
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// incrementally in nsImageFrame.cpp.
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// imgIContainerObserver (override nsStubImageDecoderObserver)
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NS_IMETHOD FrameChanged(imgIRequest *aRequest,
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imgIContainer *aContainer,
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const nsIntRect *aDirtyRect);
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void Destroy();
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imgIRequest *GetRequest() { return mRequest; }
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nsImageLoader *GetNextLoader() { return mNextLoader; }
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private:
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nsresult Load(imgIRequest *aImage);
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/* if aDamageRect is nsnull, the whole frame is redrawn. */
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void DoRedraw(const nsRect* aDamageRect);
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nsIFrame *mFrame;
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nsCOMPtr<imgIRequest> mRequest;
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PRUint32 mActions;
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nsRefPtr<nsImageLoader> mNextLoader;
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// This is a boolean flag indicating whether or not the current image request
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// has been registered with the refresh driver.
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bool mRequestRegistered;
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};
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