mirror of
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135 lines
4.1 KiB
C++
135 lines
4.1 KiB
C++
/* -*- 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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#ifndef nsJPEGDecoder_h__
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#define nsJPEGDecoder_h__
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#include "RasterImage.h"
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/* On Windows systems, RasterImage.h brings in 'windows.h', which defines INT32.
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* But the jpeg decoder has its own definition of INT32. To avoid build issues,
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* we need to undefine the version from 'windows.h'. */
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#undef INT32
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#include "Decoder.h"
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#include "nsAutoPtr.h"
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#include "imgIDecoderObserver.h"
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#include "nsIInputStream.h"
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#include "nsIPipe.h"
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#include "qcms.h"
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extern "C" {
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#include "jpeglib.h"
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}
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#include <setjmp.h>
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namespace mozilla {
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namespace image {
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typedef struct {
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struct jpeg_error_mgr pub; /* "public" fields for IJG library*/
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jmp_buf setjmp_buffer; /* For handling catastropic errors */
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} decoder_error_mgr;
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typedef enum {
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JPEG_HEADER, /* Reading JFIF headers */
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JPEG_START_DECOMPRESS,
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JPEG_DECOMPRESS_PROGRESSIVE, /* Output progressive pixels */
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JPEG_DECOMPRESS_SEQUENTIAL, /* Output sequential pixels */
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JPEG_DONE,
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JPEG_SINK_NON_JPEG_TRAILER, /* Some image files have a */
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/* non-JPEG trailer */
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JPEG_ERROR
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} jstate;
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class RasterImage;
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class nsJPEGDecoder : public Decoder
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{
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public:
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nsJPEGDecoder(RasterImage &aImage, imgIDecoderObserver* aObserver);
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virtual ~nsJPEGDecoder();
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virtual void InitInternal();
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virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);
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virtual void FinishInternal();
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virtual Telemetry::ID SpeedHistogram();
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void NotifyDone();
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protected:
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void OutputScanlines(bool* suspend);
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public:
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PRUint8 *mImageData;
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struct jpeg_decompress_struct mInfo;
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struct jpeg_source_mgr mSourceMgr;
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decoder_error_mgr mErr;
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jstate mState;
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PRUint32 mBytesToSkip;
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const JOCTET *mSegment; // The current segment we are decoding from
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PRUint32 mSegmentLen; // amount of data in mSegment
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JOCTET *mBackBuffer;
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PRUint32 mBackBufferLen; // Offset of end of active backtrack data
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PRUint32 mBackBufferSize; // size in bytes what mBackBuffer was created with
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PRUint32 mBackBufferUnreadLen; // amount of data currently in mBackBuffer
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JOCTET *mProfile;
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PRUint32 mProfileLength;
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qcms_profile *mInProfile;
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qcms_transform *mTransform;
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bool mReading;
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PRUint32 mCMSMode;
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};
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} // namespace image
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} // namespace mozilla
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#endif // nsJPEGDecoder_h__
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