/* -*- 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 the JPEG image encoder.
 *
 * The Initial Developer of the Original Code is 
 * Scott MacGregor <mscott@mozilla.org>.
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * 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 ***** */

#ifndef nsJPEGEncoder_h_
#define nsJPEGEncoder_h_

#include "imgIEncoder.h"
#include "nsIOutputStream.h"

#include <ole2.h> // stgmedium

#include "nsCOMPtr.h"

extern "C" {
#include "jpeglib.h"
}

#include <setjmp.h>

#define NS_JPEGENCODER_CID \
{ /* 13784154-1C73-4635-B75F-F1F21755E1C1 */         \
     0x13784154,                                     \
     0x1c73,                                         \
     0x4635,                                         \
    {0xb7, 0x5f, 0xf1, 0xf2, 0x17, 0x55, 0xe1, 0xc1} \
}

// helper structs for interacting with the jpeg library
typedef struct {
    struct jpeg_error_mgr pub;  /* "public" fields for IJG library*/
    jmp_buf setjmp_buffer;      /* For handling catastropic errors */
} encoder_error_mgr;


class nsJPEGEncoder : public imgIEncoder
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_IMGIENCODER

  nsJPEGEncoder();
  virtual ~nsJPEGEncoder();

public:
  encoder_error_mgr mErr;
  struct jpeg_compress_struct mInfo;

  JOCTET *mBuffer;      // temporary buffer the jpeg library writes the compressed data to before we write it out to disk
  PRUint32 mBufferLen;  // amount of data currently in mBuffer
  PRUint32 mBufferSize; // size in bytes what mBuffer was created with
  nsCOMPtr<nsIOutputStream> mOutputStream;

protected:
  nsresult initCompressionInfo(); 
};

#endif // nsJPEGEncoder_h_