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120 lines
4.2 KiB
Plaintext
120 lines
4.2 KiB
Plaintext
/* -*- 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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* Bobby Holley <bobbyholley@gmail.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 "nsISupports.idl"
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interface nsIInputStream;
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interface imgIContainer;
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interface imgIDecoderObserver;
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/**
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* imgIDecoder interface
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*
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* @author Stuart Parmenter <pavlov@netscape.com>
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* @version 0.2
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* @see imagelib2
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*/
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[scriptable, uuid(6fc61088-5443-4539-9e24-629a266a800a)]
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interface imgIDecoder : nsISupports
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{
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/**
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* Bits that can be passed to the decoder to affect decoding.
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* @name decodeflags
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*
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* Meanings:
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*
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* DECODER_FLAG_NONE: No flags
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*
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* DECODER_FLAG_HEADERONLY: Read basic data from the image in order to
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* set up the image container, but don't read any actual image data.
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*/
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const long DECODER_FLAG_NONE = 0x0;
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const long DECODER_FLAG_HEADERONLY = 0x1;
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/**
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* Initialize an image decoder.
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* @param aContainer The image container to decode to.
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* @param aObserver The observer for decode notification events.
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* @param aFlags Flags for the decoder
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*
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* @note The decoder should always pass NULL as the
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* first two parameters to all of the imgIDecoderObserver APIs.
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*/
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void init(in imgIContainer aImage, in imgIDecoderObserver aObserver,
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in unsigned long aFlags);
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/**
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* Closes the stream.
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* @param aFlags Close flags of the CLOSE_FLAG_* Variety
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*
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* Resources are always freed with this call. If notifications are sent,
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* OnStopDecode is guaranteed to be called if it hasn't been called already.
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*
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* CLOSE_FLAG_DONTNOTIFY - Don't send any observer notifications, and don't
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* call imgIContainer::decodingComplete().
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*/
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const long CLOSE_FLAG_DONTNOTIFY = 0x01;
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void close(in PRUint32 aFlags);
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/**
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* Flushes the stream.
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*/
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void flush();
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/**
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* Writes data to the decoder.
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*
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* For Header-Only decodes, OnStartContainer is the only notification
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* fired. It is an error to write any more data to the decoder for header-only
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* decodes after SetSize() has been called.
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*
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* If a decoding error occurs, an internal flag is set and an error is
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* returned. Each subsequent call to write will fail immediately
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* for the lifetime of the decoder. Shutdown notifications of the OnStopX
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* variety, as well as DecodingComplete(), are guaranteed not to be called
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* if a decoding error occurs.
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*
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* @param aBuffer buffer containing the data to be written
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* @param aCount the number of bytes to write
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*/
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void write(in string aBuffer, in unsigned long count);
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};
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