gecko/modules/libpr0n/decoders/nsJPEGDecoder.h

133 lines
4.1 KiB
C++

/* -*- 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 mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <pavlov@netscape.com>
* Bobby Holley <bobbyholley@gmail.com>
*
* 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 nsJPEGDecoder_h__
#define nsJPEGDecoder_h__
#include "RasterImage.h"
/* On Windows systems, RasterImage.h brings in 'windows.h', which defines INT32.
* But the jpeg decoder has its own definition of INT32. To avoid build issues,
* we need to undefine the version from 'windows.h'. */
#undef INT32
#include "Decoder.h"
#include "nsAutoPtr.h"
#include "imgIDecoderObserver.h"
#include "nsIInputStream.h"
#include "nsIPipe.h"
#include "qcms.h"
extern "C" {
#include "jpeglib.h"
}
#include <setjmp.h>
namespace mozilla {
namespace imagelib {
typedef struct {
struct jpeg_error_mgr pub; /* "public" fields for IJG library*/
jmp_buf setjmp_buffer; /* For handling catastropic errors */
} decoder_error_mgr;
typedef enum {
JPEG_HEADER, /* Reading JFIF headers */
JPEG_START_DECOMPRESS,
JPEG_DECOMPRESS_PROGRESSIVE, /* Output progressive pixels */
JPEG_DECOMPRESS_SEQUENTIAL, /* Output sequential pixels */
JPEG_DONE,
JPEG_SINK_NON_JPEG_TRAILER, /* Some image files have a */
/* non-JPEG trailer */
JPEG_ERROR
} jstate;
class RasterImage;
class nsJPEGDecoder : public Decoder
{
public:
nsJPEGDecoder();
virtual ~nsJPEGDecoder();
virtual nsresult InitInternal();
virtual nsresult WriteInternal(const char* aBuffer, PRUint32 aCount);
virtual nsresult ShutdownInternal(PRUint32 aFlags);
void NotifyDone(PRBool aSuccess);
protected:
nsresult OutputScanlines(PRBool* suspend);
public:
PRUint8 *mImageData;
struct jpeg_decompress_struct mInfo;
struct jpeg_source_mgr mSourceMgr;
decoder_error_mgr mErr;
jstate mState;
PRUint32 mBytesToSkip;
const JOCTET *mSegment; // The current segment we are decoding from
PRUint32 mSegmentLen; // amount of data in mSegment
JOCTET *mBackBuffer;
PRUint32 mBackBufferLen; // Offset of end of active backtrack data
PRUint32 mBackBufferSize; // size in bytes what mBackBuffer was created with
PRUint32 mBackBufferUnreadLen; // amount of data currently in mBackBuffer
JOCTET *mProfile;
PRUint32 mProfileLength;
qcms_profile *mInProfile;
qcms_transform *mTransform;
PRPackedBool mReading;
PRPackedBool mNotifiedDone;
};
} // namespace imagelib
} // namespace mozilla
#endif // nsJPEGDecoder_h__