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