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nsStubImageDecoderObserver.h
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nsStubImageDecoderObserver.h
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/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
/* ***** 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 nsStubDocumentObserver.
*
* The Initial Developer of the Original Code is the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 ***** */
/*
* nsStubImageDecoderObserver is an implementation of the imgIDecoderObserver
* interface (except for the methods on nsISupports) that is intended to be
* used as a base class within the content/layout library. All methods do
* nothing.
*/
#ifndef nsStubImageDecoderObserver_h_
#define nsStubImageDecoderObserver_h_
#include "imgIDecoderObserver.h"
/**
* There are two advantages to inheriting from nsStubImageDecoderObserver
* rather than directly from imgIDecoderObserver:
* 1. smaller compiled code size (since there's no need for the code
* for the empty virtual function implementations for every
* imgIDecoderObserver implementation)
* 2. the performance of document's loop over observers benefits from
* the fact that more of the functions called are the same (which
* can reduce instruction cache misses and perhaps improve branch
* prediction)
*/
class nsStubImageDecoderObserver : public imgIDecoderObserver {
public:
NS_DECL_IMGICONTAINEROBSERVER
NS_DECL_IMGIDECODEROBSERVER
};
#endif /* !defined(nsStubImageDecoderObserver_h_) */