gecko-dev/layout/base/nsImageLoader.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <pavlov@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* class to notify frames of background and border image loads */
#include "nsStubImageDecoderObserver.h"
class nsIFrame;
class nsIURI;
#include "imgIRequest.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
/**
* Image loaders pass notifications for background and border image
* loading and animation on to the frames.
*
* Each frame's image loaders form a linked list.
*/
class nsImageLoader : public nsStubImageDecoderObserver
{
private:
nsImageLoader(nsIFrame *aFrame, PRUint32 aActions,
nsImageLoader *aNextLoader);
virtual ~nsImageLoader();
public:
/*
* Flags to specify actions that can be taken for the image at various
* times. Reflows always occur before redraws. "Decode" refers to one
* frame being available, whereas "load" refers to all the data being loaded
* from the network.
*/
enum {
ACTION_REFLOW_ON_DECODE = 0x01,
ACTION_REDRAW_ON_DECODE = 0x02,
ACTION_REFLOW_ON_LOAD = 0x04,
ACTION_REDRAW_ON_LOAD = 0x08
};
static already_AddRefed<nsImageLoader>
Create(nsIFrame *aFrame, imgIRequest *aRequest,
PRUint32 aActions, nsImageLoader *aNextLoader);
NS_DECL_ISUPPORTS
// imgIDecoderObserver (override nsStubImageDecoderObserver)
NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
NS_IMETHOD OnStopFrame(imgIRequest *aRequest, PRUint32 aFrame);
NS_IMETHOD OnStopRequest(imgIRequest *aRequest, PRBool aLastPart);
// Do not override OnDataAvailable since background images are not
// displayed incrementally; they are displayed after the entire image
// has been loaded.
// Note: Images referenced by the <img> element are displayed
// incrementally in nsImageFrame.cpp.
// imgIContainerObserver (override nsStubImageDecoderObserver)
NS_IMETHOD FrameChanged(imgIContainer *aContainer, nsIntRect *dirtyRect);
void Destroy();
imgIRequest *GetRequest() { return mRequest; }
nsImageLoader *GetNextLoader() { return mNextLoader; }
private:
nsresult Load(imgIRequest *aImage);
void DoReflow();
/* if aDamageRect is nsnull, the whole frame is redrawn. */
void DoRedraw(const nsRect* aDamageRect);
nsIFrame *mFrame;
nsCOMPtr<imgIRequest> mRequest;
PRUint32 mActions;
nsRefPtr<nsImageLoader> mNextLoader;
};