mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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162 lines
5.6 KiB
C++
162 lines
5.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Stuart Parmenter <pavlov@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "imgIRequest.h"
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#include "imgIDecoderObserver.h"
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#include "nsISecurityInfoProvider.h"
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#include "imgIContainer.h"
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#include "imgIDecoder.h"
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#include "nsIRequestObserver.h"
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#include "nsIChannel.h"
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#include "nsILoadGroup.h"
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#include "nsISupportsPriority.h"
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#include "nsCOMPtr.h"
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#include "nsAutoPtr.h"
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#include "nsThreadUtils.h"
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#include "imgRequest.h"
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#define NS_IMGREQUESTPROXY_CID \
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{ /* 20557898-1dd2-11b2-8f65-9c462ee2bc95 */ \
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0x20557898, \
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0x1dd2, \
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0x11b2, \
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{0x8f, 0x65, 0x9c, 0x46, 0x2e, 0xe2, 0xbc, 0x95} \
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}
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class imgRequestProxy : public imgIRequest, public nsISupportsPriority, public nsISecurityInfoProvider
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_IMGIREQUEST
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NS_DECL_NSIREQUEST
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NS_DECL_NSISUPPORTSPRIORITY
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NS_DECL_NSISECURITYINFOPROVIDER
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imgRequestProxy();
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virtual ~imgRequestProxy();
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// Callers to Init or ChangeOwner are required to call
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// NotifyProxyListener on the request after (although not immediately
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// after) doing so.
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nsresult Init(imgRequest *request, nsILoadGroup *aLoadGroup, imgIDecoderObserver *aObserver);
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nsresult ChangeOwner(imgRequest *aNewOwner); // this will change mOwner. Do not call this if the previous
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// owner has already sent notifications out!
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void AddToLoadGroup();
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void RemoveFromLoadGroup(PRBool releaseLoadGroup);
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protected:
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friend class imgRequest;
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class imgCancelRunnable;
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friend class imgCancelRunnable;
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class imgCancelRunnable : public nsRunnable
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{
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public:
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imgCancelRunnable(imgRequestProxy* owner, nsresult status)
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: mOwner(owner), mStatus(status)
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{}
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NS_IMETHOD Run() {
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mOwner->DoCancel(mStatus);
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return NS_OK;
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}
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private:
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nsRefPtr<imgRequestProxy> mOwner;
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nsresult mStatus;
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};
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/* non-virtual imgIDecoderObserver methods */
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void OnStartDecode ();
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void OnStartContainer(imgIContainer *aContainer);
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void OnStartFrame (PRUint32 aFrame);
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void OnDataAvailable (PRBool aCurrentFrame, const nsIntRect * aRect);
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void OnStopFrame (PRUint32 aFrame);
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void OnStopContainer (imgIContainer *aContainer);
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void OnStopDecode (nsresult status, const PRUnichar *statusArg);
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void OnDiscard ();
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/* non-virtual imgIContainerObserver methods */
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void FrameChanged(imgIContainer *aContainer, nsIntRect * aDirtyRect);
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/* non-virtual nsIRequestObserver (plus some) methods */
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void OnStartRequest(nsIRequest *request, nsISupports *ctxt);
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void OnStopRequest(nsIRequest *request, nsISupports *ctxt, nsresult statusCode, PRBool aLastPart);
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inline PRBool HasObserver() const {
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return mListener != nsnull;
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}
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/* Finish up canceling ourselves */
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void DoCancel(nsresult status);
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/* Do the proper refcount management to null out mListener */
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void NullOutListener();
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private:
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friend class imgCacheValidator;
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// We maintain the following invariant:
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// The proxy is registered at most with a single imgRequest as an observer,
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// and whenever it is, mOwner points to that object. This helps ensure that
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// imgRequestProxy::~imgRequestProxy unregisters the proxy as an observer
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// from whatever request it was registered with (if any). This, in turn,
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// means that imgRequest::mObservers will not have any stale pointers in it.
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nsRefPtr<imgRequest> mOwner;
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// mListener is only promised to be a weak ref (see imgILoader.idl),
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// but we actually keep a strong ref to it until we've seen our
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// first OnStopRequest.
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imgIDecoderObserver* mListener;
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nsCOMPtr<nsILoadGroup> mLoadGroup;
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nsLoadFlags mLoadFlags;
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PRPackedBool mCanceled;
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PRPackedBool mIsInLoadGroup;
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PRPackedBool mListenerIsStrongRef;
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PRPackedBool mShouldRequestDecode;
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PRPackedBool mLockHeld;
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};
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