modules/libpr0n/decoders/nsJPEGDecoder.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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  21  * the Initial Developer. All Rights Reserved.
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  23  * Contributor(s):
  24  *   Stuart Parmenter <pavlov@netscape.com>
  25  *   Bobby Holley <bobbyholley@gmail.com>
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  39  * ***** END LICENSE BLOCK ***** */
  40
  41 #ifndef nsJPEGDecoder_h__
  42 #define nsJPEGDecoder_h__
  43
  44 #include "RasterImage.h"
  45 /* On Windows systems, RasterImage.h brings in 'windows.h', which defines INT32.
  46  * But the jpeg decoder has its own definition of INT32. To avoid build issues,
  47  * we need to undefine the version from 'windows.h'. */
  48 #undef INT32
  49
  50 #include "Decoder.h"
  51
  52 #include "nsAutoPtr.h"
  53
  54 #include "imgIDecoderObserver.h"
  55 #include "nsIInputStream.h"
  56 #include "nsIPipe.h"
  57 #include "qcms.h"
  58
  59 extern "C" {
  60 #include "jpeglib.h"
  61 }
  62
  63 #include <setjmp.h>
  64
  65 namespace mozilla {
  66 namespace imagelib {
  67
  68 typedef struct {
  69     struct jpeg_error_mgr pub;  /* "public" fields for IJG library*/
  70     jmp_buf setjmp_buffer;      /* For handling catastropic errors */
  71 } decoder_error_mgr;
  72
  73 typedef enum {
  74     JPEG_HEADER,                          /* Reading JFIF headers */
  75     JPEG_START_DECOMPRESS,
  76     JPEG_DECOMPRESS_PROGRESSIVE,          /* Output progressive pixels */
  77     JPEG_DECOMPRESS_SEQUENTIAL,           /* Output sequential pixels */
  78     JPEG_DONE,
  79     JPEG_SINK_NON_JPEG_TRAILER,          /* Some image files have a */
  80                                          /* non-JPEG trailer */
  81     JPEG_ERROR
  82 } jstate;
  83
  84 class RasterImage;
  85
  86 class nsJPEGDecoder : public Decoder
  87 {
  88 public:
  89   nsJPEGDecoder();
  90   virtual ~nsJPEGDecoder();
  91
  92   virtual void InitInternal();
  93   virtual void WriteInternal(const char* aBuffer, PRUint32 aCount);
  94   virtual void FinishInternal();
  95
  96   void NotifyDone();
  97
  98 protected:
  99   void OutputScanlines(PRBool* suspend);
 100
 101 public:
 102   PRUint8 *mImageData;
 103
 104   struct jpeg_decompress_struct mInfo;
 105   struct jpeg_source_mgr mSourceMgr;
 106   decoder_error_mgr mErr;
 107   jstate mState;
 108
 109   PRUint32 mBytesToSkip;
 110
 111   const JOCTET *mSegment;   // The current segment we are decoding from
 112   PRUint32 mSegmentLen;     // amount of data in mSegment
 113
 114   JOCTET *mBackBuffer;
 115   PRUint32 mBackBufferLen; // Offset of end of active backtrack data
 116   PRUint32 mBackBufferSize; // size in bytes what mBackBuffer was created with
 117   PRUint32 mBackBufferUnreadLen; // amount of data currently in mBackBuffer
 118
 119   JOCTET  *mProfile;
 120   PRUint32 mProfileLength;
 121
 122   qcms_profile *mInProfile;
 123   qcms_transform *mTransform;
 124
 125   PRPackedBool mReading;
 126
 127   PRUint32 mCMSMode;
 128 };
 129
 130 } // namespace imagelib
 131 } // namespace mozilla
 132
 133 #endif // nsJPEGDecoder_h__